97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
/*
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* Copyright (C) 2009-2021 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. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "VM.h"
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#include "Yarr.h"
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#include "YarrJIT.h"
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namespace JSC {
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class VM;
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class ExecutablePool;
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class RegExp;
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namespace Yarr {
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class YarrCodeBlock;
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class MatchingContextHolder {
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WTF_FORBID_HEAP_ALLOCATION;
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public:
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MatchingContextHolder(VM&, YarrCodeBlock*, RegExp*, MatchFrom);
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~MatchingContextHolder();
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static ptrdiff_t offsetOfStackLimit() { return OBJECT_OFFSETOF(MatchingContextHolder, m_stackLimit); }
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#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
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static ptrdiff_t offsetOfPatternContextBuffer() { return OBJECT_OFFSETOF(MatchingContextHolder, m_patternContextBuffer); }
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static ptrdiff_t offsetOfPatternContextBufferSize() { return OBJECT_OFFSETOF(MatchingContextHolder, m_patternContextBufferSize); }
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#endif
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private:
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VM& m_vm;
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void* m_stackLimit;
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#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
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void* m_patternContextBuffer { nullptr };
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unsigned m_patternContextBufferSize { 0 };
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#endif
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MatchFrom m_matchFrom;
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};
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inline MatchingContextHolder::MatchingContextHolder(VM& vm, YarrCodeBlock* yarrCodeBlock, RegExp* regExp, MatchFrom matchFrom)
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: m_vm(vm)
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, m_matchFrom(matchFrom)
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{
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if (matchFrom == MatchFrom::VMThread) {
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m_stackLimit = vm.softStackLimit();
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vm.m_executingRegExp = regExp;
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} else {
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StackBounds stack = Thread::current().stack();
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m_stackLimit = stack.recursionLimit(Options::reservedZoneSize());
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}
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#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
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if (yarrCodeBlock && yarrCodeBlock->usesPatternContextBuffer()) {
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m_patternContextBuffer = m_vm.acquireRegExpPatternContexBuffer();
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m_patternContextBufferSize = VM::patternContextBufferSize;
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}
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#else
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UNUSED_PARAM(yarrCodeBlock);
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#endif
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}
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inline MatchingContextHolder::~MatchingContextHolder()
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{
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#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
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if (m_patternContextBuffer)
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m_vm.releaseRegExpPatternContexBuffer();
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#endif
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if (m_matchFrom == MatchFrom::VMThread)
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m_vm.m_executingRegExp = nullptr;
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}
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} } // namespace JSC::Yarr
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