136 lines
5.3 KiB
C++
136 lines
5.3 KiB
C++
/*
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* Copyright (C) 2015 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(CONTENT_EXTENSIONS)
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namespace WebCore {
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namespace ContentExtensions {
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typedef uint8_t DFABytecode;
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// Increment ContentExtensionStore::CurrentContentExtensionFileVersion
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// when making any non-backwards-compatible changes to the bytecode.
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// FIXME: Changes here should not require changes in WebKit2. Move all versioning to WebCore.
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enum class DFABytecodeInstruction : uint8_t {
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// CheckValue has two arguments:
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// The value to check (1 byte),
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// The distance to jump if the values are equal (1-4 bytes, signed).
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CheckValueCaseInsensitive = 0x0,
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CheckValueCaseSensitive = 0x1,
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// Jump table if the input value is within a certain range.
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// The lower value (1 byte).
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// The higher value (1 byte).
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// The distance to jump if the value is in the range
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// for every character in the range (1-4 bytes, signed).
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JumpTableCaseInsensitive = 0x2,
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JumpTableCaseSensitive = 0x3,
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// Jump to an offset if the input value is within a certain range.
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// The lower value (1 byte).
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// The higher value (1 byte).
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// The distance to jump if the value is in the range (1-4 bytes, signed).
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CheckValueRangeCaseInsensitive = 0x4,
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CheckValueRangeCaseSensitive = 0x5,
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// AppendAction has one argument:
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// The action to append (4 bytes).
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AppendAction = 0x6,
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AppendActionWithIfCondition = 0x7,
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// TestFlagsAndAppendAction has two arguments:
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// The flags to check before appending (2 bytes).
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// The action to append (4 bytes).
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TestFlagsAndAppendAction = 0x8,
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TestFlagsAndAppendActionWithIfCondition = 0x9,
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// Terminate has no arguments.
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Terminate = 0xA,
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// Jump has one argument:
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// The distance to jump (1-4 bytes, signed).
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Jump = 0xB,
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};
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// The last four bits contain the instruction type.
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const uint8_t DFABytecodeInstructionMask = 0x0F;
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const uint8_t DFABytecodeJumpSizeMask = 0xF0;
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// DFA bytecode starts with a 4 byte header which contains the size of this DFA.
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typedef uint32_t DFAHeader;
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// A DFABytecodeJumpSize is stored in the top four bits of the DFABytecodeInstructions that have a jump.
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enum DFABytecodeJumpSize {
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Int8 = 0x10,
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Int16 = 0x20,
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Int24 = 0x30,
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Int32 = 0x40,
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};
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const int32_t Int24Max = (1 << 23) - 1;
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const int32_t Int24Min = -(1 << 23);
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static inline DFABytecodeJumpSize smallestPossibleJumpSize(int32_t longestPossibleJump)
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{
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if (longestPossibleJump <= std::numeric_limits<int8_t>::max() && longestPossibleJump >= std::numeric_limits<int8_t>::min())
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return Int8;
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if (longestPossibleJump <= std::numeric_limits<int16_t>::max() && longestPossibleJump >= std::numeric_limits<int16_t>::min())
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return Int16;
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if (longestPossibleJump <= Int24Max && longestPossibleJump >= Int24Min)
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return Int24;
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return Int32;
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}
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static inline size_t instructionSizeWithArguments(DFABytecodeInstruction instruction)
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{
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switch (instruction) {
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case DFABytecodeInstruction::CheckValueCaseSensitive:
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case DFABytecodeInstruction::CheckValueCaseInsensitive:
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case DFABytecodeInstruction::JumpTableCaseInsensitive:
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case DFABytecodeInstruction::JumpTableCaseSensitive:
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case DFABytecodeInstruction::CheckValueRangeCaseSensitive:
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case DFABytecodeInstruction::CheckValueRangeCaseInsensitive:
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case DFABytecodeInstruction::Jump:
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RELEASE_ASSERT_NOT_REACHED(); // Variable instruction size.
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case DFABytecodeInstruction::AppendAction:
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case DFABytecodeInstruction::AppendActionWithIfCondition:
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return sizeof(DFABytecodeInstruction) + sizeof(uint32_t);
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case DFABytecodeInstruction::TestFlagsAndAppendAction:
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case DFABytecodeInstruction::TestFlagsAndAppendActionWithIfCondition:
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return sizeof(DFABytecodeInstruction) + sizeof(uint16_t) + sizeof(uint32_t);
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case DFABytecodeInstruction::Terminate:
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return sizeof(DFABytecodeInstruction);
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}
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RELEASE_ASSERT_NOT_REACHED();
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}
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} // namespace ContentExtensions
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} // namespace WebCore
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#endif // ENABLE(CONTENT_EXTENSIONS)
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