[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
Tests for ES6 "let"
|
|
|
|
|
|
|
|
|
|
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
PASS Does not have syntax error: 'let x = 20; if (truth()) { let x = 30; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = 20; if (truth()) { let x = 30; }'
|
|
|
|
|
PASS Does not have syntax error: 'let {x} = {x:20}; if (truth()) { let {x} = {x : 20}; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let {x} = {x:20}; if (truth()) { let {x} = {x : 20}; }'
|
|
|
|
|
PASS Does not have syntax error: 'let {x} = {x:20}; if (truth()) { let {y: x} = {y : 20}; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let {x} = {x:20}; if (truth()) { let {y: x} = {y : 20}; }'
|
|
|
|
|
PASS Does not have syntax error: 'let {x, y: [arr]} = {x:20, y: [10]}; if (truth()) { let {y: x} = {y : 20}; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let {x, y: [arr]} = {x:20, y: [10]}; if (truth()) { let {y: x} = {y : 20}; }'
|
|
|
|
|
PASS Does not have syntax error: 'let i = 40; for (let i = 1; i < 2; i++) { let i = 40; i; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let i = 40; for (let i = 1; i < 2; i++) { let i = 40; i; }'
|
|
|
|
|
PASS Does not have syntax error: 'let i = 40; let obj = {}; for (let i in obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let i = 40; let obj = {}; for (let i in obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: 'let i = 40; let obj = []; for (let i of obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let i = 40; let obj = []; for (let i of obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: 'let {i} = 20; let obj = []; for (let {i} of obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let {i} = 20; let obj = []; for (let {i} of obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: 'let {i} = 20; let obj = []; for (let {i} in obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let {i} = 20; let obj = []; for (let {i} in obj) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: 'let {i} = 20; let obj = []; for (let {i} = {i: 0}; i < 2; i++) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let {i} = 20; let obj = []; for (let {i} = {i: 0}; i < 2; i++) { let i = 40; let obj = {}; i; }'
|
|
|
|
|
PASS Does not have syntax error: 'function foo() { let foo = 20; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; function foo() { let foo = 20; }'
|
|
|
|
|
PASS Does not have syntax error: 'function foo(bar) { if (truth()) { let bar; } }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; function foo(bar) { if (truth()) { let bar; } }'
|
|
|
|
|
PASS Does not have syntax error: 'function foo() { var bar; if (truth()) { let bar; } }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; function foo() { var bar; if (truth()) { let bar; } }'
|
|
|
|
|
PASS Does not have syntax error: ';({ get let() { return 50; }, set let(x) { return 50;} });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; ;({ get let() { return 50; }, set let(x) { return 50;} });'
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Does not have syntax error: 'function foo() { { let x; } var x; }'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; function foo() { { let x; } var x; }'
|
2016-02-13 04:52:01 +00:00
|
|
|
PASS Does not have syntax error: 'var x = (function foo() { const foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; var x = (function foo() { const foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: 'var x = (function foo() { let foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; var x = (function foo() { let foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: 'var x = (function foo() { class foo { } });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; var x = (function foo() { class foo { } });'
|
|
|
|
|
PASS Does not have syntax error: ';(function foo() { const foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; ;(function foo() { const foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: ';(function foo() { let foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; ;(function foo() { let foo = 20; });'
|
|
|
|
|
PASS Does not have syntax error: ';(function foo() { class foo { } });'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; ;(function foo() { class foo { } });'
|
|
|
|
|
PASS Does not have syntax error: 'let x = {f: function foo() { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = {f: function foo() { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = {f: function foo() { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = {f: function foo() { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = {f: function foo() { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = {f: function foo() { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { foo() { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { foo() { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { foo() { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { foo() { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { foo() { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { foo() { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { set foo(x) { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { set foo(x) { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { set foo(x) { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { set foo(x) { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { set foo(x) { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { set foo(x) { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { get foo() { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { get foo() { const foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { get foo() { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { get foo() { let foo = 20; } };'
|
|
|
|
|
PASS Does not have syntax error: 'let x = { get foo() { class foo { } } };'
|
|
|
|
|
PASS Does not have syntax error: ''use strict'; let x = { get foo() { class foo { } } };'
|
2017-03-13 17:03:19 +00:00
|
|
|
PASS Does not have syntax error: 'let x; with ({}) let: y = 3;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let let;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let let;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'const let;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; const let;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {let};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
|
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {let};'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {l: let};'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {l: let};'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {l: {let}};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
|
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {l: {let}};'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {l: [let]};'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {l: [let]};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ';'. Expected an initializer in destructuring variable declaration.
|
|
|
|
|
SyntaxError: Unexpected token ';'. Expected an initializer in destructuring variable declaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'var {let};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
|
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; var {let};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let x, x;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let x, x;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let x = 20, y, x = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let x = 20, y, x = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let x = 20, y; let x = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let x = 20, y; let x = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let x = 20, y, {x} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let x = 20, y, {x} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let x = 20, y; let {x} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let x = 20, y; let {x} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {x, y, z, x} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {x, y, z, x} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {x: xx, y, x: xx} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {x: xx, y, x: xx} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {x: xx, foo: [xx]} = {foo:[12]};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {x: xx, foo: [xx]} = {foo:[12]};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let {x: xx, foo: {y: xx}} = {foo:[12]};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'xx'. Cannot declare a lexical variable twice: 'xx'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let {x: xx, foo: {y: xx}} = {foo:[12]};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ';'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ';'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'for (let; ; ) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ';'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ';'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; for (let; ; ) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'arr'. Expected either 'in' or 'of' in enumeration syntax.
|
|
|
|
|
SyntaxError: Unexpected identifier 'arr'. Expected either 'in' or 'of' in enumeration syntax.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let arr = []; for (let of arr) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'arr'. Expected either 'in' or 'of' in enumeration syntax.
|
|
|
|
|
SyntaxError: Unexpected identifier 'arr'. Expected either 'in' or 'of' in enumeration syntax.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let arr = []; for (let of arr) {}'
|
2016-01-22 04:21:36 +00:00
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
|
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let obj = {}; for (let in arr) {}'
|
2016-01-22 04:21:36 +00:00
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
|
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let obj = {}; for (let in arr) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'i'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'i'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'for (let i = 20, j = 40, i = 10; i < 10; i++) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'i'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'i'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; for (let i = 20, j = 40, i = 10; i < 10; i++) {}'
|
2017-03-13 17:03:19 +00:00
|
|
|
SyntaxError: Unexpected identifier 'x'
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let x = 20; if (truth()) let x = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let x = 20; if (truth()) let x = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'let baz = 20; if (truth()) { let x = 20; let x = 40;} '
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let baz = 20; if (truth()) { let x = 20; let x = 40;} '
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'function foo() { var bar; let bar; }'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function foo() { var bar; let bar; }'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'function foo(bar) { let bar; }'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function foo(bar) { let bar; }'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'foo'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'foo'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'function foo() {}; let foo;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a let variable twice: 'foo'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'foo'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function foo() {}; let foo;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'function foo() {}; function bar(){} let baz, {bar} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function foo() {}; function bar(){} let baz, {bar} = {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'function foo() {}; function bar(){} let baz, {f: {bar}} = {f:{}};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Unexpected token '}'. Cannot declare a lexical variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function foo() {}; function bar(){} let baz, {f: {bar}} = {f:{}};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'bar'. Cannot declare a lexical variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'bar'. Cannot declare a lexical variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'function foo() {}; function bar(){} let baz, {f: [bar]} = {f:[10]};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected identifier 'bar'. Cannot declare a lexical variable twice: 'bar'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'bar'. Cannot declare a lexical variable twice: 'bar'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function foo() {}; function bar(){} let baz, {f: [bar]} = {f:[10]};'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'. Cannot use 'let' as an identifier name for a LexicalDeclaration.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'for (let let = 0; let < 10; let++) {}'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a lexical variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; for (let let = 0; let < 10; let++) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '['. Expected either 'in' or 'of' in enumeration syntax.
|
|
|
|
|
SyntaxError: Unexpected token '['. Expected either 'in' or 'of' in enumeration syntax.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'for (let of []) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token '['. Expected either 'in' or 'of' in enumeration syntax.
|
|
|
|
|
SyntaxError: Unexpected token '['. Expected either 'in' or 'of' in enumeration syntax.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; for (let of []) {}'
|
2016-01-22 04:21:36 +00:00
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
|
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: 'for (let in {}) {}'
|
2016-01-22 04:21:36 +00:00
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
|
|
|
|
SyntaxError: Cannot use the keyword 'in' as a lexical variable name.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; for (let in {}) {}'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'let x; var x;'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; let x; var x;'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'let x; var {x} = 20;'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; let x; var {x} = 20;'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'let x; var [x] = 20;'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; let x; var [x] = 20;'
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { var x; let x; }'
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { var x; let x; }'
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { var x; let [x] = 20; }'
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { var x; let [x] = 20; }'
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { var [x] = 20; let [x] = 20; }'
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
SyntaxError: Unexpected identifier 'x'. Cannot declare a lexical variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { var [x] = 20; let [x] = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { var [x] = 20; let x; }'
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { var [x] = 20; let x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { let x; var x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { let x; var x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { let x; var {x} = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { let x; var {x} = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { let x; var [x] = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { let x; var [x] = 20; }'
|
2016-03-10 02:04:20 +00:00
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
|
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Has syntax error: 'function f() { let x; function x(){} }'
|
2016-03-10 02:04:20 +00:00
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
|
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function f() { let x; function x(){} }'
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { function x(){}; let x; }'
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a let variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { function x(){}; let x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { const x = 20; var x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { const x = 20; var x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { const x = 20; var {x} = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { const x = 20; var {x} = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { const x = 20; var [x] = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { const x = 20; var [x] = 20; }'
|
2016-03-10 02:04:20 +00:00
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
|
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Has syntax error: 'function f() { const x = 20; function x(){} }'
|
2016-03-10 02:04:20 +00:00
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
|
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function f() { const x = 20; function x(){} }'
|
|
|
|
|
SyntaxError: Cannot declare a const variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a const variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { function x(){}; const x = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a const variable twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a const variable twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { function x(){}; const x = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { class x{}; var x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { class x{}; var x; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { class x{}; var {x} = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { class x{}; var {x} = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { class x{}; var [x] = 20; }'
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { class x{}; var [x] = 20; }'
|
2016-03-10 02:04:20 +00:00
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
|
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Has syntax error: 'function f() { class x{}; function x(){} }'
|
2016-03-10 02:04:20 +00:00
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
|
|
|
|
SyntaxError: Cannot declare a function that shadows a let/const/class/function variable 'x' in strict mode.
|
2015-09-23 22:37:36 +00:00
|
|
|
PASS Has syntax error: ''use strict'; function f() { class x{}; function x(){} }'
|
|
|
|
|
SyntaxError: Cannot declare a class twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a class twice: 'x'.
|
|
|
|
|
PASS Has syntax error: 'function f() { function x(){}; class x{}; }'
|
|
|
|
|
SyntaxError: Cannot declare a class twice: 'x'.
|
|
|
|
|
SyntaxError: Cannot declare a class twice: 'x'.
|
|
|
|
|
PASS Has syntax error: ''use strict'; function f() { function x(){}; class x{}; }'
|
2017-03-13 17:03:19 +00:00
|
|
|
SyntaxError: Unexpected identifier 'y'
|
|
|
|
|
SyntaxError: Unexpected identifier 'y'
|
|
|
|
|
PASS Has syntax error: 'let x; with ({}) let y = 3;'
|
2015-09-23 22:37:36 +00:00
|
|
|
ReferenceError: Can't find variable: let
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Does not have syntax error: 'let;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ';'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ';'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let;'
|
|
|
|
|
PASS Does not have syntax error: 'var let;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; var let;'
|
|
|
|
|
PASS Does not have syntax error: 'var {let} = 40;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
|
|
|
|
SyntaxError: Cannot use abbreviated destructuring syntax for keyword 'let'.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; var {let} = 40;'
|
2017-04-27 02:28:39 +00:00
|
|
|
TypeError: undefined is not a function (near '...[let]...')
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Does not have syntax error: 'var [let] = 40;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; var [let] = 40;'
|
|
|
|
|
PASS Does not have syntax error: 'var {p: let} = 40;'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a variable name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a variable name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; var {p: let} = 40;'
|
|
|
|
|
PASS Does not have syntax error: '(function test(let){});'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a parameter name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a parameter name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; (function test(let){});'
|
|
|
|
|
PASS Does not have syntax error: 'let: for (v of []) break let;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let: for (v of []) break let;'
|
|
|
|
|
PASS Does not have syntax error: 'let: for (v of []) continue let;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let: for (v of []) continue let;'
|
|
|
|
|
PASS Does not have syntax error: 'let: for (v in {}) break;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let: for (v in {}) break;'
|
|
|
|
|
PASS Does not have syntax error: 'let: for (v in {}) break;'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let: for (v in {}) break;'
|
|
|
|
|
PASS Does not have syntax error: 'let: for (var v = 0; false; ) {};'
|
2015-09-23 22:37:36 +00:00
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
|
|
|
|
SyntaxError: Unexpected token ':'. Expected a parameter pattern or a ')' in parameter list.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; let: for (var v = 0; false; ) {};'
|
|
|
|
|
PASS Does not have syntax error: 'try { } catch(let) {}'
|
2017-04-24 16:06:33 +00:00
|
|
|
SyntaxError: Cannot use 'let' as a catch parameter name in strict mode.
|
|
|
|
|
SyntaxError: Cannot use 'let' as a catch parameter name in strict mode.
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS Has syntax error: ''use strict'; try { } catch(let) {}'
|
2017-03-13 17:03:19 +00:00
|
|
|
PASS Does not have syntax error: 'let x; if (true) let: x = 3;'
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'
|
|
|
|
|
SyntaxError: Unexpected keyword 'let'
|
|
|
|
|
PASS Has syntax error: ''use strict'; let x; if (true) let: x = 3;'
|
[ES6] implement block scoping to enable 'let'
https://bugs.webkit.org/show_bug.cgi?id=142944
Reviewed by Filip Pizlo.
Source/JavaScriptCore:
* CMakeLists.txt:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* builtins/BuiltinExecutables.cpp:
(JSC::BuiltinExecutables::createExecutableInternal):
* bytecode/BytecodeList.json:
This patch adds a new opcode and removes op_pop_scope:
1) op_get_parent_scope returns the parent scope but doesn't
implicitly write that scope into the scope register. op_pop_scope
is now reduced to op_get_parent_scope followed by op_mov.
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/CodeBlock.cpp:
(JSC::CodeBlock::dumpBytecode):
(JSC::CodeBlock::CodeBlock):
(JSC::CodeBlock::stronglyVisitStrongReferences):
* bytecode/CodeBlock.h:
(JSC::CodeBlock::addStringSwitchJumpTable):
(JSC::CodeBlock::stringSwitchJumpTable):
(JSC::CodeBlock::symbolTable):
(JSC::CodeBlock::evalCodeCache):
(JSC::CodeBlock::setConstantRegisters):
(JSC::CodeBlock::replaceConstant):
op_put_to_scope for LocalClosureVar now takes as an argument
the constant index for the Symbol Table it will be putting into.
This argument is only used to communicate from the BytecodeGenerator
to CodeBlock linking time and it is not present in the linked bytecode.
op_put_to_scope for non LocalClosureVar takes, at the same index, an
argument that represents the local scope depth which it uses for
JSScope::abstractResolve to know how many scopes it needs to skip.
Again, this is not in the linked code.
op_get_from_scope and op_resolve_scope also take as an argument
the local scope depth to use in JSScope::abstractResolve. Again,
this is not used in the linked code.
* bytecode/EvalCodeCache.h:
(JSC::EvalCodeCache::tryGet):
(JSC::EvalCodeCache::getSlow):
(JSC::EvalCodeCache::clear):
(JSC::EvalCodeCache::isCacheable):
When direct eval is called and passed a scope that
corresponds to a lexical scope, we can't safely cache
that code because we won't be able to guarantee
that the cached code is always executed in the same scope.
Consider this example:
function foo() {
let x = 20;
eval("x;");
if (b) {
let x = 30;
if (b) {
let y = 40;
eval("x;")
}
}
}
We can't reuse resolution depth when linking get_from_scope in evals.
* bytecode/UnlinkedCodeBlock.cpp:
(JSC::generateFunctionCodeBlock):
(JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
(JSC::UnlinkedFunctionExecutable::parameterCount):
* bytecode/UnlinkedCodeBlock.h:
Unlinked functions now know the variables that were under TDZ in their parent
scope.
(JSC::UnlinkedCodeBlock::symbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTable):
(JSC::UnlinkedCodeBlock::setSymbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::symbolTableConstantIndex):
(JSC::UnlinkedCodeBlock::vm):
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::generate):
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::~BytecodeGenerator):
(JSC::BytecodeGenerator::newRegister):
(JSC::BytecodeGenerator::reclaimFreeRegisters):
(JSC::BytecodeGenerator::newBlockScopeVariable):
(JSC::BytecodeGenerator::newTemporary):
(JSC::BytecodeGenerator::emitProfileType):
(JSC::BytecodeGenerator::emitLoadGlobalObject):
(JSC::BytecodeGenerator::pushLexicalScope):
(JSC::BytecodeGenerator::popLexicalScope):
(JSC::BytecodeGenerator::prepareLexicalScopeForNextForLoopIteration):
(JSC::BytecodeGenerator::variable):
(JSC::BytecodeGenerator::variablePerSymbolTable):
(JSC::BytecodeGenerator::variableForLocalEntry):
(JSC::BytecodeGenerator::createVariable):
(JSC::BytecodeGenerator::emitResolveScope):
(JSC::BytecodeGenerator::emitGetFromScope):
(JSC::BytecodeGenerator::emitPutToScope):
(JSC::BytecodeGenerator::initializeVariable):
(JSC::BytecodeGenerator::emitTDZCheck):
(JSC::BytecodeGenerator::needsTDZCheck):
(JSC::BytecodeGenerator::emitTDZCheckIfNecessary):
(JSC::BytecodeGenerator::liftTDZCheckIfPossible):
(JSC::BytecodeGenerator::getVariablesUnderTDZ):
(JSC::BytecodeGenerator::emitNewObject):
(JSC::BytecodeGenerator::emitPushWithScope):
(JSC::BytecodeGenerator::emitGetParentScope):
(JSC::BytecodeGenerator::emitPopScope):
(JSC::BytecodeGenerator::emitDebugHook):
(JSC::BytecodeGenerator::pushFinallyContext):
(JSC::BytecodeGenerator::pushIteratorCloseContext):
(JSC::BytecodeGenerator::emitComplexPopScopes):
(JSC::BytecodeGenerator::emitPopScopes):
(JSC::BytecodeGenerator::popTryAndEmitCatch):
(JSC::BytecodeGenerator::calculateTargetScopeDepthForExceptionHandler):
(JSC::BytecodeGenerator::currentScopeDepth):
(JSC::BytecodeGenerator::emitThrowReferenceError):
(JSC::BytecodeGenerator::emitPushCatchScope):
(JSC::BytecodeGenerator::beginSwitch):
(JSC::BytecodeGenerator::emitReadOnlyExceptionIfNeeded):
(JSC::BytecodeGenerator::emitEnumeration):
* bytecompiler/BytecodeGenerator.h:
(JSC::Variable::Variable):
(JSC::Variable::isResolved):
(JSC::Variable::symbolTableConstantIndex):
(JSC::Variable::ident):
(JSC::BytecodeGenerator::ignoredResult):
(JSC::BytecodeGenerator::tempDestination):
(JSC::BytecodeGenerator::lastOpcodeID):
(JSC::BytecodeGenerator::makeFunction):
(JSC::BytecodeGenerator::symbolTable):
(JSC::BytecodeGenerator::shouldOptimizeLocals): Deleted.
(JSC::BytecodeGenerator::canOptimizeNonLocals): Deleted.
The heart of the changes in this patch are in the bytecode generator.
The bytecode generator now keeps a stack of tuples of
{symbol table, scope register, flag indicating catch or with scope, symbol table index in constant pool}
that models the runtime scope stack. This symbol table stack is used
in resolving local variables.
Also, the bytecode generator handles pushing and popping of lexical scopes.
This is relatively straight forward:
Captured 'let' variables end up in the JSLexicalEnvironment scope and non-captured
variables end up on the stack. Some trickiness is involved in generating
code for 'for' loops that have captured variables (I'm talking about variables in the loop
header, not the loop body). Each iteration of the for loop ends up with
its own JSLexicalEnvironment. Static code must be generated in such a way
to create this runtime behavior. This is done by emitting instructions to
push and pop a lexical scope at the end of each loop and copying values
from the previous loop's scope into the new scope. This code must also
ensure that each loop iteration's scope refers to the same underlying
SymbolTable so that no scope is accidentally mistaken as being a singleton scope.
When the debugger is enabled, all lexically defined variables will end up in the
JSLexicalEnvironment.
* bytecompiler/NodesCodegen.cpp:
(JSC::ResolveNode::emitBytecode):
(JSC::FunctionCallResolveNode::emitBytecode):
(JSC::PostfixNode::emitResolve):
(JSC::DeleteResolveNode::emitBytecode):
(JSC::TypeOfResolveNode::emitBytecode):
(JSC::PrefixNode::emitResolve):
(JSC::ReadModifyResolveNode::emitBytecode):
(JSC::AssignResolveNode::emitBytecode):
(JSC::BlockNode::emitBytecode):
(JSC::ExprStatementNode::emitBytecode):
(JSC::DeclarationStatement::emitBytecode):
(JSC::EmptyVarExpression::emitBytecode):
(JSC::EmptyLetExpression::emitBytecode):
(JSC::ForNode::emitBytecode):
(JSC::ForInNode::emitMultiLoopBytecode):
(JSC::ForOfNode::emitBytecode):
(JSC::SwitchNode::emitBytecode):
(JSC::BindingNode::bindValue):
(JSC::VarStatementNode::emitBytecode): Deleted.
* debugger/DebuggerCallFrame.cpp:
(JSC::DebuggerCallFrame::evaluate):
* debugger/DebuggerScope.cpp:
(JSC::DebuggerScope::getOwnPropertySlot):
(JSC::DebuggerScope::put):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGNode.h:
(JSC::DFG::Node::castConstant):
(JSC::DFG::Node::initializationValueForActivation):
(JSC::DFG::Node::containsMovHint):
* dfg/DFGObjectAllocationSinkingPhase.cpp:
CreateActivation nodes now have a second OpInfo that tracks the
initial value that needs to be placed in the activation. This initial value
is also used in allocation sinking to create proper bottom values for all
scope variables.
* dfg/DFGOperations.cpp:
* dfg/DFGOperations.h:
* dfg/DFGSpeculativeJIT.cpp:
(JSC::DFG::SpeculativeJIT::compileCreateActivation):
* dfg/DFGSpeculativeJIT.h:
(JSC::DFG::SpeculativeJIT::callOperation):
* ftl/FTLIntrinsicRepository.h:
* ftl/FTLLowerDFGToLLVM.cpp:
(JSC::FTL::DFG::LowerDFGToLLVM::compileCreateActivation):
(JSC::FTL::DFG::LowerDFGToLLVM::compileMaterializeCreateActivation):
* ftl/FTLOperations.cpp:
(JSC::FTL::operationMaterializeObjectInOSR):
* interpreter/Interpreter.cpp:
(JSC::Interpreter::execute):
* jit/CCallHelpers.h:
(JSC::CCallHelpers::setupArgumentsWithExecState):
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITInlines.h:
(JSC::JIT::callOperation):
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::compileOpStrictEq):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_push_with_scope):
(JSC::JIT::emit_op_to_number):
(JSC::JIT::emit_op_catch):
(JSC::JIT::emit_op_create_lexical_environment):
(JSC::JIT::emit_op_get_parent_scope):
(JSC::JIT::emit_op_switch_imm):
(JSC::JIT::emit_op_enter):
(JSC::JIT::emit_op_get_scope):
(JSC::JIT::emit_op_pop_scope): Deleted.
* jit/JITOperations.cpp:
(JSC::canAccessArgumentIndexQuickly):
* jit/JITOperations.h:
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* parser/ASTBuilder.h:
(JSC::ASTBuilder::createSourceElements):
(JSC::ASTBuilder::funcDeclarations):
(JSC::ASTBuilder::features):
(JSC::ASTBuilder::numConstants):
(JSC::ASTBuilder::createConditionalExpr):
(JSC::ASTBuilder::createAssignResolve):
(JSC::ASTBuilder::createClassDeclStatement):
(JSC::ASTBuilder::createBlockStatement):
(JSC::ASTBuilder::createIfStatement):
(JSC::ASTBuilder::createForLoop):
(JSC::ASTBuilder::createForInLoop):
(JSC::ASTBuilder::createForOfLoop):
(JSC::ASTBuilder::isBindingNode):
(JSC::ASTBuilder::createEmptyStatement):
(JSC::ASTBuilder::createDeclarationStatement):
(JSC::ASTBuilder::createVarStatement):
(JSC::ASTBuilder::createLetStatement):
(JSC::ASTBuilder::createEmptyVarExpression):
(JSC::ASTBuilder::createEmptyLetExpression):
(JSC::ASTBuilder::createReturnStatement):
(JSC::ASTBuilder::createTryStatement):
(JSC::ASTBuilder::createSwitchStatement):
(JSC::ASTBuilder::appendStatement):
(JSC::ASTBuilder::createCommaExpr):
(JSC::ASTBuilder::appendObjectPatternEntry):
(JSC::ASTBuilder::createBindingLocation):
(JSC::ASTBuilder::setEndOffset):
(JSC::ASTBuilder::Scope::Scope):
(JSC::ASTBuilder::makeAssignNode):
(JSC::ASTBuilder::varDeclarations): Deleted.
(JSC::ASTBuilder::addVar): Deleted.
* parser/Keywords.table:
* parser/NodeConstructors.h:
(JSC::ReadModifyResolveNode::ReadModifyResolveNode):
(JSC::AssignResolveNode::AssignResolveNode):
(JSC::ExprStatementNode::ExprStatementNode):
(JSC::DeclarationStatement::DeclarationStatement):
(JSC::EmptyVarExpression::EmptyVarExpression):
(JSC::EmptyLetExpression::EmptyLetExpression):
(JSC::IfElseNode::IfElseNode):
(JSC::WhileNode::WhileNode):
(JSC::ForNode::ForNode):
(JSC::CaseBlockNode::CaseBlockNode):
(JSC::SwitchNode::SwitchNode):
(JSC::ConstDeclNode::ConstDeclNode):
(JSC::BlockNode::BlockNode):
(JSC::EnumerationNode::EnumerationNode):
(JSC::ForInNode::ForInNode):
(JSC::ForOfNode::ForOfNode):
(JSC::ObjectPatternNode::create):
(JSC::BindingNode::create):
(JSC::BindingNode::BindingNode):
(JSC::VarStatementNode::VarStatementNode): Deleted.
* parser/Nodes.cpp:
(JSC::ScopeNode::ScopeNode):
(JSC::ScopeNode::singleStatement):
(JSC::ProgramNode::ProgramNode):
(JSC::EvalNode::EvalNode):
(JSC::FunctionNode::FunctionNode):
(JSC::FunctionNode::finishParsing):
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
* parser/Nodes.h:
(JSC::VariableEnvironmentNode::VariableEnvironmentNode):
(JSC::VariableEnvironmentNode::lexicalVariables):
(JSC::ScopeNode::usesThis):
(JSC::ScopeNode::needsActivationForMoreThanVariables):
(JSC::ScopeNode::needsActivation):
(JSC::ScopeNode::hasCapturedVariables):
(JSC::ScopeNode::captures):
(JSC::ScopeNode::varDeclarations):
(JSC::ScopeNode::functionStack):
(JSC::ScopeNode::neededConstants):
(JSC::ProgramNode::startColumn):
(JSC::ProgramNode::endColumn):
(JSC::EvalNode::startColumn):
(JSC::EvalNode::endColumn):
(JSC::BindingNode::boundProperty):
(JSC::BindingNode::divotStart):
(JSC::BindingNode::divotEnd):
(JSC::ScopeNode::capturedVariableCount): Deleted.
(JSC::ScopeNode::capturedVariables): Deleted.
(JSC::ScopeNode::varStack): Deleted.
There is a new class called 'VariableEnvironmentNode' that has the
necessary fields to model a lexical scope. Multiple AST nodes now
also inherit from VariableEnvironmentNode.
* parser/Parser.cpp:
(JSC::Parser<LexerType>::parseInner):
(JSC::Parser<LexerType>::didFinishParsing):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclaration):
(JSC::Parser<LexerType>::parseWhileStatement):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::createBindingPattern):
(JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
(JSC::Parser<LexerType>::parseDestructuringPattern):
(JSC::Parser<LexerType>::parseConstDeclarationList):
(JSC::Parser<LexerType>::parseForStatement):
(JSC::Parser<LexerType>::parseBreakStatement):
(JSC::Parser<LexerType>::parseContinueStatement):
(JSC::Parser<LexerType>::parseSwitchStatement):
(JSC::Parser<LexerType>::parseTryStatement):
(JSC::Parser<LexerType>::parseBlockStatement):
(JSC::Parser<LexerType>::parseStatement):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClassDeclaration):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseGetterSetter):
(JSC::Parser<LexerType>::parsePrimaryExpression):
(JSC::Parser<LexerType>::parseVarDeclaration): Deleted.
(JSC::Parser<LexerType>::parseVarDeclarationList): Deleted.
* parser/Parser.h:
(JSC::Scope::Scope):
(JSC::Scope::setIsFunction):
(JSC::Scope::isFunction):
(JSC::Scope::isFunctionBoundary):
(JSC::Scope::setIsLexicalScope):
(JSC::Scope::isLexicalScope):
(JSC::Scope::declaredVariables):
(JSC::Scope::finalizeLexicalEnvironment):
(JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
(JSC::Scope::declareCallee):
(JSC::Scope::declareVariable):
(JSC::Scope::declareLexicalVariable):
(JSC::Scope::hasDeclaredVariable):
(JSC::Scope::hasLexicallyDeclaredVariable):
(JSC::Scope::hasDeclaredParameter):
(JSC::Scope::declareWrite):
(JSC::Scope::preventAllVariableDeclarations):
(JSC::Scope::preventVarDeclarations):
(JSC::Scope::allowsVarDeclarations):
(JSC::Scope::allowsLexicalDeclarations):
(JSC::Scope::declareParameter):
(JSC::Scope::declareBoundParameter):
(JSC::Scope::useVariable):
(JSC::Scope::setNeedsFullActivation):
(JSC::Scope::needsFullActivation):
(JSC::Scope::hasDirectSuper):
(JSC::Scope::setNeedsSuperBinding):
(JSC::Scope::collectFreeVariables):
(JSC::Scope::getCapturedVars):
(JSC::Scope::copyCapturedVariablesToVector):
(JSC::Parser::AutoCleanupLexicalScope::AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::~AutoCleanupLexicalScope):
(JSC::Parser::AutoCleanupLexicalScope::setIsValid):
(JSC::Parser::AutoCleanupLexicalScope::isValid):
(JSC::Parser::AutoCleanupLexicalScope::setPopped):
(JSC::Parser::AutoCleanupLexicalScope::scope):
(JSC::Parser::currentScope):
(JSC::Parser::pushScope):
(JSC::Parser::popScopeInternal):
(JSC::Parser::popScope):
(JSC::Parser::declareVariable):
(JSC::Parser::hasDeclaredVariable):
(JSC::Parser::hasDeclaredParameter):
(JSC::Parser::declareWrite):
(JSC::Parser::findCachedFunctionInfo):
(JSC::Parser::isFunctionBodyNode):
(JSC::Parser::continueIsValid):
(JSC::Parser::pushLabel):
(JSC::Parser::popLabel):
(JSC::Parser::getLabel):
(JSC::Parser::isLETMaskedAsIDENT):
(JSC::Parser<LexerType>::parse):
(JSC::Scope::preventNewDecls): Deleted.
(JSC::Scope::allowsNewDecls): Deleted.
(JSC::Scope::getCapturedVariables): Deleted.
There are basic parser changes that now allow for the 'let'
keyword. The trickiest change is how we will still treat 'let'
as an identifier for sloppy-mode code sometimes. For example,
"var let = ..." is allowed but "let let" or "const let" is not.
The most significant change to the parser made for this patch
is appropriating the Scope struct to also also model a lexical
scope. Changes were made in how we track captured variables to
account for this. In general, I think some of this code could
benefit from a slight refactoring to make things cleaner.
* parser/ParserTokens.h:
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::createNewExpr):
(JSC::SyntaxChecker::createConditionalExpr):
(JSC::SyntaxChecker::createAssignResolve):
(JSC::SyntaxChecker::createEmptyVarExpression):
(JSC::SyntaxChecker::createEmptyLetExpression):
(JSC::SyntaxChecker::createClassExpr):
(JSC::SyntaxChecker::createClassDeclStatement):
(JSC::SyntaxChecker::createBlockStatement):
(JSC::SyntaxChecker::createExprStatement):
(JSC::SyntaxChecker::createIfStatement):
(JSC::SyntaxChecker::createForLoop):
(JSC::SyntaxChecker::createForInLoop):
(JSC::SyntaxChecker::createForOfLoop):
(JSC::SyntaxChecker::createEmptyStatement):
(JSC::SyntaxChecker::createVarStatement):
(JSC::SyntaxChecker::createLetStatement):
(JSC::SyntaxChecker::createReturnStatement):
(JSC::SyntaxChecker::createBreakStatement):
(JSC::SyntaxChecker::createContinueStatement):
(JSC::SyntaxChecker::createTryStatement):
(JSC::SyntaxChecker::createSwitchStatement):
(JSC::SyntaxChecker::createWhileStatement):
(JSC::SyntaxChecker::createWithStatement):
(JSC::SyntaxChecker::createDoWhileStatement):
(JSC::SyntaxChecker::createGetterOrSetterProperty):
(JSC::SyntaxChecker::appendStatement):
(JSC::SyntaxChecker::combineCommaNodes):
(JSC::SyntaxChecker::evalCount):
(JSC::SyntaxChecker::appendBinaryExpressionInfo):
(JSC::SyntaxChecker::operatorStackPop):
(JSC::SyntaxChecker::addVar): Deleted.
* parser/VariableEnvironment.cpp: Added.
(JSC::VariableEnvironment::markVariableAsCapturedIfDefined):
(JSC::VariableEnvironment::markVariableAsCaptured):
(JSC::VariableEnvironment::markAllVariablesAsCaptured):
(JSC::VariableEnvironment::hasCapturedVariables):
(JSC::VariableEnvironment::captures):
(JSC::VariableEnvironment::swap):
* parser/VariableEnvironment.h: Added.
(JSC::VariableEnvironmentEntry::isCaptured):
(JSC::VariableEnvironmentEntry::isConstant):
(JSC::VariableEnvironmentEntry::isVar):
(JSC::VariableEnvironmentEntry::isLet):
(JSC::VariableEnvironmentEntry::setIsCaptured):
(JSC::VariableEnvironmentEntry::setIsConstant):
(JSC::VariableEnvironmentEntry::setIsVar):
(JSC::VariableEnvironmentEntry::setIsLet):
(JSC::VariableEnvironmentEntry::clearIsVar):
(JSC::VariableEnvironment::begin):
(JSC::VariableEnvironment::end):
(JSC::VariableEnvironment::add):
(JSC::VariableEnvironment::size):
(JSC::VariableEnvironment::contains):
(JSC::VariableEnvironment::remove):
VariableEnvironment is a new class that keeps track
of the static environment in the parser and the bytecode generator.
VariableEnvironment behaves like SymbolTable but for the bytecode generator.
It keeps track of variable types, i.e, if a variable is a "var", "let", "const"
and whether or not its captured.
* runtime/CodeCache.cpp:
(JSC::CodeCache::getGlobalCodeBlock):
(JSC::CodeCache::getProgramCodeBlock):
(JSC::CodeCache::getEvalCodeBlock):
(JSC::CodeCache::getFunctionExecutableFromGlobalCode):
* runtime/CodeCache.h:
(JSC::CodeCache::clear):
* runtime/CommonSlowPaths.cpp:
(JSC::SLOW_PATH_DECL):
* runtime/CommonSlowPaths.h:
* runtime/ExceptionHelpers.cpp:
(JSC::createErrorForInvalidGlobalAssignment):
(JSC::createTDZError):
(JSC::throwOutOfMemoryError):
* runtime/ExceptionHelpers.h:
* runtime/Executable.cpp:
(JSC::EvalExecutable::create):
(JSC::ProgramExecutable::initializeGlobalProperties):
* runtime/Executable.h:
* runtime/JSCJSValue.h:
(JSC::jsUndefined):
(JSC::jsTDZValue):
(JSC::jsBoolean):
* runtime/JSEnvironmentRecord.h:
(JSC::JSEnvironmentRecord::finishCreationUninitialized):
(JSC::JSEnvironmentRecord::finishCreation):
* runtime/JSGlobalObject.cpp:
(JSC::JSGlobalObject::createProgramCodeBlock):
(JSC::JSGlobalObject::createEvalCodeBlock):
* runtime/JSGlobalObject.h:
(JSC::JSGlobalObject::weakRandomInteger):
* runtime/JSGlobalObjectFunctions.cpp:
(JSC::globalFuncEval):
* runtime/JSLexicalEnvironment.cpp:
(JSC::JSLexicalEnvironment::symbolTableGet):
* runtime/JSLexicalEnvironment.h:
(JSC::JSLexicalEnvironment::create):
* runtime/JSScope.cpp:
(JSC::JSScope::resolve):
(JSC::JSScope::abstractResolve):
(JSC::JSScope::collectVariablesUnderTDZ):
(JSC::JSScope::isLexicalScope):
(JSC::resolveModeName):
* runtime/JSScope.h:
* runtime/PropertySlot.h:
(JSC::PropertySlot::setValue):
* runtime/SymbolTable.cpp:
(JSC::SymbolTable::SymbolTable):
(JSC::SymbolTable::cloneScopePart):
* runtime/SymbolTable.h:
SymbolTable now uses an extra bit to know if it corresponds
to a "let"-like environment or not.
* runtime/WriteBarrier.h:
(JSC::WriteBarrierBase<Unknown>::get):
(JSC::WriteBarrierBase<Unknown>::clear):
(JSC::WriteBarrierBase<Unknown>::setUndefined):
(JSC::WriteBarrierBase<Unknown>::setStartingValue):
(JSC::WriteBarrierBase<Unknown>::isNumber):
(JSC::WriteBarrierBase<Unknown>::isObject):
(JSC::WriteBarrierBase<Unknown>::isNull):
* tests/stress/activation-sink-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
(foo.cap):
* tests/stress/activation-sink-osrexit-default-value-tdz-error.js: Added.
(shouldThrowTDZ):
(bar):
* tests/stress/lexical-let-and-with-statement.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-exception-handling.js: Added.
(truth):
(assert):
(.):
* tests/stress/lexical-let-global-not-captured-variables.js: Added.
(truth):
(assert):
(foo):
(.let.capY):
* tests/stress/lexical-let-loop-semantics.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-not-strict-mode.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
* tests/stress/lexical-let-semantics.js: Added.
(truth):
(assert):
(let.globalFunction):
(let.retGlobalNumberCaptured):
(let.setGlobalNumberCaptured):
(.):
* tests/stress/lexical-let-tdz.js: Added.
(truth):
(assert):
(shouldThrowTDZ):
(.):
LayoutTests:
* js/dom/reserved-words-as-property-expected.txt:
* js/keywords-and-reserved_words-expected.txt:
* js/let-syntax-expected.txt: Added.
* js/let-syntax.html: Added.
* js/reserved-words-strict-expected.txt:
* js/script-tests/keywords-and-reserved_words.js:
* js/script-tests/let-syntax.js: Added.
(truth):
(assert):
(hasSyntaxError):
(shouldHaveSyntaxError):
(shouldNotHaveSyntaxError):
(shouldHaveSyntaxErrorStrictOnly):
* js/script-tests/reserved-words-strict.js:
* js/script-tests/statement-list-item-syntax-errors.js:
(testSyntax):
(runTests):
* js/statement-list-item-syntax-errors-expected.txt:
Canonical link: https://commits.webkit.org/165034@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@186860 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2015-07-15 21:41:08 +00:00
|
|
|
PASS successfullyParsed is true
|
|
|
|
|
|
|
|
|
|
TEST COMPLETE
|
|
|
|
|
|