Source/JavaScriptCore/dfg/DFGJITFinalizer.cpp

/*
 * Copyright (C) 2013-2020 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.
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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. ``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
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#include "config.h"
#include "DFGJITFinalizer.h"

#if ENABLE(DFG_JIT)

#include "CodeBlock.h"
#include "CodeBlockWithJITType.h"
#include "DFGCommon.h"
#include "DFGPlan.h"
#include "JSCInlines.h"
#include "ProfilerDatabase.h"

namespace JSC { namespace DFG {

JITFinalizer::JITFinalizer(Plan& plan, Ref<JITCode>&& jitCode, std::unique_ptr<LinkBuffer> linkBuffer, MacroAssemblerCodePtr<JSEntryPtrTag> withArityCheck)
    : Finalizer(plan)
    , m_jitCode(WTFMove(jitCode))
    , m_linkBuffer(WTFMove(linkBuffer))
    , m_withArityCheck(withArityCheck)
{
}

JITFinalizer::~JITFinalizer()
{
}

size_t JITFinalizer::codeSize()
{
    return m_linkBuffer->size();
}

bool JITFinalizer::finalize()
{
    MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = FINALIZE_DFG_CODE(*m_linkBuffer, JSEntryPtrTag, "DFG JIT code for %s", toCString(CodeBlockWithJITType(m_plan.codeBlock(), JITType::DFGJIT)).data());
    m_jitCode->initializeCodeRefForDFG(codeRef, codeRef.code());

    m_plan.codeBlock()->setJITCode(m_jitCode.copyRef());

    finalizeCommon();
    
    return true;
}

bool JITFinalizer::finalizeFunction()
{
    RELEASE_ASSERT(!m_withArityCheck.isEmptyValue());
    m_jitCode->initializeCodeRefForDFG(
        FINALIZE_DFG_CODE(*m_linkBuffer, JSEntryPtrTag, "DFG JIT code for %s", toCString(CodeBlockWithJITType(m_plan.codeBlock(), JITType::DFGJIT)).data()),
        m_withArityCheck);
    m_plan.codeBlock()->setJITCode(m_jitCode.copyRef());

    finalizeCommon();
    
    return true;
}

void JITFinalizer::finalizeCommon()
{
    CodeBlock* codeBlock = m_plan.codeBlock();

    // Some JIT finalizers may have added more constants. Shrink-to-fit those things now.
    {
        ConcurrentJSLocker locker(codeBlock->m_lock);
        codeBlock->constants().shrinkToFit();
        codeBlock->constantsSourceCodeRepresentation().shrinkToFit();
    }

#if ENABLE(FTL_JIT)
    m_jitCode->optimizeAfterWarmUp(codeBlock);
#endif // ENABLE(FTL_JIT)

    if (UNLIKELY(m_plan.compilation()))
        m_plan.vm()->m_perBytecodeProfiler->addCompilation(codeBlock, *m_plan.compilation());

    if (!m_plan.willTryToTierUp())
        codeBlock->baselineVersion()->m_didFailFTLCompilation = true;

    // The codeBlock is now responsible for keeping many things alive (e.g. frozen values)
    // that were previously kept alive by the plan.
    m_plan.vm()->heap.writeBarrier(codeBlock);
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)