source: webkit/trunk/Source/JavaScriptCore/dfg/DFGDesiredTransitions.cpp

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 * Copyright (C) 2013-2021 Apple Inc. All rights reserved.
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#include "config.h"
#include "DFGDesiredTransitions.h"

#if ENABLE(DFG_JIT)

#include "CodeBlock.h"
#include "DFGCommonData.h"
#include "JSCellInlines.h"
#include "SlotVisitorInlines.h"

namespace JSC { namespace DFG {

DesiredTransition::DesiredTransition(CodeBlock* codeOriginOwner, Structure* oldStructure, Structure* newStructure)
    : m_codeOriginOwner(codeOriginOwner)
    , m_oldStructure(oldStructure)
    , m_newStructure(newStructure)
{
}

template<typename Visitor>
void DesiredTransition::visitChildren(Visitor& visitor)
{
    visitor.appendUnbarriered(m_codeOriginOwner);
    visitor.appendUnbarriered(m_oldStructure);
    visitor.appendUnbarriered(m_newStructure);
}

template void DesiredTransition::visitChildren(AbstractSlotVisitor&);
template void DesiredTransition::visitChildren(SlotVisitor&);

DesiredTransitions::DesiredTransitions(CodeBlock* codeBlock)
    : m_codeBlock(codeBlock)
{
}

DesiredTransitions::~DesiredTransitions()
{
}

void DesiredTransitions::addLazily(CodeBlock* codeOriginOwner, Structure* oldStructure, Structure* newStructure)
{
    m_transitions.append(DesiredTransition(codeOriginOwner, oldStructure, newStructure));
}

void DesiredTransitions::reallyAdd(VM& vm, CommonData* common)
{
    FixedVector<WeakReferenceTransition> transitions(m_transitions.size());
    for (unsigned i = 0; i < m_transitions.size(); i++) {
        auto& desiredTransition = m_transitions[i];
        transitions[i] = WeakReferenceTransition(vm, m_codeBlock, desiredTransition.m_codeOriginOwner, desiredTransition.m_oldStructure, desiredTransition.m_newStructure);
    }
    if (!transitions.isEmpty()) {
        ConcurrentJSLocker locker(m_codeBlock->m_lock);
        ASSERT(common->m_transitions.isEmpty());
        common->m_transitions = WTFMove(transitions);
    }
}

template<typename Visitor>
void DesiredTransitions::visitChildren(Visitor& visitor)
{
    for (unsigned i = 0; i < m_transitions.size(); i++)
        m_transitions[i].visitChildren(visitor);
}

template void DesiredTransitions::visitChildren(AbstractSlotVisitor&);
template void DesiredTransitions::visitChildren(SlotVisitor&);

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)