Source/JavaScriptCore/dfg/DFGDesiredWriteBarriers.cpp

/*
 * Copyright (C) 2013, 2014 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
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 *    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. AND ITS CONTRIBUTORS ``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 ITS CONTRIBUTORS
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#include "config.h"
#include "DFGDesiredWriteBarriers.h"

#if ENABLE(DFG_JIT)

#include "CodeBlock.h"
#include "JSCInlines.h"

namespace JSC { namespace DFG {

DesiredWriteBarrier::DesiredWriteBarrier(Type type, CodeBlock* codeBlock, unsigned index, JSCell* owner)
    : m_owner(owner)
    , m_type(type)
    , m_codeBlock(codeBlock)
{
    m_which.index = index;
}

DesiredWriteBarrier::DesiredWriteBarrier(Type type, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner)
    : m_owner(owner)
    , m_type(type)
    , m_codeBlock(codeBlock)
{
    m_which.inlineCallFrame = inlineCallFrame;
}

void DesiredWriteBarrier::trigger(VM& vm)
{
    switch (m_type) {
    case ConstantType: {
        WriteBarrier<Unknown>& barrier = m_codeBlock->constants()[m_which.index];
        barrier.set(vm, m_owner, barrier.get());
        return;
    }

    case InlineCallFrameExecutableType: {
        InlineCallFrame* inlineCallFrame = m_which.inlineCallFrame;
        WriteBarrier<ScriptExecutable>& executable = inlineCallFrame->executable;
        executable.set(vm, m_owner, executable.get());
        return;
    } }
    RELEASE_ASSERT_NOT_REACHED();
}

void DesiredWriteBarrier::visitChildren(SlotVisitor& visitor)
{
    switch (m_type) {
    case ConstantType: {
        WriteBarrier<Unknown>& barrier = m_codeBlock->constants()[m_which.index];
        visitor.append(&barrier);
        return;
    }
        
    case InlineCallFrameExecutableType: {
        InlineCallFrame* inlineCallFrame = m_which.inlineCallFrame;
        WriteBarrier<ScriptExecutable>& executable = inlineCallFrame->executable;
        visitor.append(&executable);
        return;
    } }
    RELEASE_ASSERT_NOT_REACHED();
}

DesiredWriteBarriers::DesiredWriteBarriers()
{
}

DesiredWriteBarriers::~DesiredWriteBarriers()
{
}

void DesiredWriteBarriers::trigger(VM& vm)
{
    for (unsigned i = 0; i < m_barriers.size(); i++)
        m_barriers[i].trigger(vm);
}

void DesiredWriteBarriers::visitChildren(SlotVisitor& visitor)
{
    for (unsigned i = 0; i < m_barriers.size(); i++)
        m_barriers[i].visitChildren(visitor);
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)