mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 12:19:46 +00:00
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/*
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* Copyright (C) 2013-2016 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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#include "config.h"
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#include "DFGDesiredWeakReferences.h"
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#if ENABLE(DFG_JIT)
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#include "CodeBlock.h"
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#include "DFGCommonData.h"
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#include "JSCJSValueInlines.h"
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namespace JSC { namespace DFG {
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DesiredWeakReferences::DesiredWeakReferences()
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: m_codeBlock(nullptr)
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{
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}
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DesiredWeakReferences::DesiredWeakReferences(CodeBlock* codeBlock)
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: m_codeBlock(codeBlock)
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{
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}
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DesiredWeakReferences::~DesiredWeakReferences()
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{
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}
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void DesiredWeakReferences::addLazily(JSCell* cell)
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{
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if (cell)
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m_references.add(cell);
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}
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void DesiredWeakReferences::addLazily(JSValue value)
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{
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if (value.isCell())
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addLazily(value.asCell());
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}
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bool DesiredWeakReferences::contains(JSCell* cell)
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{
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return m_references.contains(cell);
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}
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void DesiredWeakReferences::reallyAdd(VM& vm, CommonData* common)
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{
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ASSERT(vm.heap.isDeferred());
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for (JSCell* target : m_references) {
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if (Structure* structure = jsDynamicCast<Structure*>(vm, target)) {
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ConcurrentJSLocker locker(m_codeBlock->m_lock);
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// We do not emit WriteBarrier here since (1) GC is deferred and (2) we emit write-barrier on CodeBlock when finishing DFG::Plan::reallyAdd.
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common->weakStructureReferences.append(structure->id());
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} else {
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// There are weird relationships in how optimized CodeBlocks
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// point to other CodeBlocks. We don't want to have them be
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// part of the weak pointer set. For example, an optimized CodeBlock
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// having a weak pointer to itself will cause it to get collected.
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RELEASE_ASSERT(!jsDynamicCast<CodeBlock*>(vm, target));
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ConcurrentJSLocker locker(m_codeBlock->m_lock);
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common->weakReferences.append(
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WriteBarrier<JSCell>(vm, m_codeBlock, target));
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}
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}
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}
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void DesiredWeakReferences::visitChildren(SlotVisitor& visitor)
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{
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for (JSCell* target : m_references)
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visitor.appendUnbarriered(target);
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}
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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