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/*
* Copyright (C) 2009-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "VM.h"
#include "Yarr.h"
#include "YarrJIT.h"
namespace JSC {
class VM;
class ExecutablePool;
class RegExp;
namespace Yarr {
class MatchingContextHolder {
WTF_FORBID_HEAP_ALLOCATION;
public:
MatchingContextHolder(VM&, bool, RegExp*, MatchFrom);
~MatchingContextHolder();
static constexpr ptrdiff_t offsetOfStackLimit() { return OBJECT_OFFSETOF(MatchingContextHolder, m_stackLimit); }
#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
static constexpr ptrdiff_t offsetOfPatternContextBuffer() { return OBJECT_OFFSETOF(MatchingContextHolder, m_patternContextBuffer); }
static constexpr ptrdiff_t offsetOfPatternContextBufferSize() { return OBJECT_OFFSETOF(MatchingContextHolder, m_patternContextBufferSize); }
#endif
private:
VM& m_vm;
void* m_stackLimit;
#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
void* m_patternContextBuffer { nullptr };
unsigned m_patternContextBufferSize { 0 };
#endif
MatchFrom m_matchFrom;
};
inline MatchingContextHolder::MatchingContextHolder(VM& vm, bool usesPatternContextBuffer, RegExp* regExp, MatchFrom matchFrom)
: m_vm(vm)
, m_matchFrom(matchFrom)
{
if (matchFrom == MatchFrom::VMThread) {
m_stackLimit = vm.softStackLimit();
vm.m_executingRegExp = regExp;
} else {
StackBounds stack = Thread::current().stack();
m_stackLimit = stack.recursionLimit(Options::reservedZoneSize());
}
#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
if (usesPatternContextBuffer) {
m_patternContextBuffer = m_vm.acquireRegExpPatternContexBuffer();
m_patternContextBufferSize = VM::patternContextBufferSize;
}
#else
UNUSED_PARAM(usesPatternContextBuffer);
#endif
}
inline MatchingContextHolder::~MatchingContextHolder()
{
#if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
if (m_patternContextBuffer)
m_vm.releaseRegExpPatternContexBuffer();
#endif
if (m_matchFrom == MatchFrom::VMThread)
m_vm.m_executingRegExp = nullptr;
}
} } // namespace JSC::Yarr
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