Source/JavaScriptCore/ftl/FTLLazySlowPath.cpp

/*
 * Copyright (C) 2015-2018 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
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 */

#include "config.h"
#include "FTLLazySlowPath.h"

#if ENABLE(FTL_JIT)

#include "LinkBuffer.h"

namespace JSC { namespace FTL {

LazySlowPath::~LazySlowPath()
{
}

void LazySlowPath::initialize(
    CodeLocationJump<JSInternalPtrTag> patchableJump, CodeLocationLabel<JSInternalPtrTag> done,
    CodeLocationLabel<ExceptionHandlerPtrTag> exceptionTarget,
    const RegisterSet& usedRegisters, CallSiteIndex callSiteIndex, RefPtr<Generator> generator
    )
{
    m_patchableJump = patchableJump;
    m_done = done;
    m_exceptionTarget = exceptionTarget;
    m_usedRegisters = usedRegisters;
    m_callSiteIndex = callSiteIndex;
    m_generator = generator;
}

void LazySlowPath::generate(CodeBlock* codeBlock)
{
    RELEASE_ASSERT(!m_stub);

    CCallHelpers jit(codeBlock);
    GenerationParams params;
    CCallHelpers::JumpList exceptionJumps;
    params.exceptionJumps = m_exceptionTarget ? &exceptionJumps : nullptr;
    params.lazySlowPath = this;

    m_generator->run(jit, params);

    LinkBuffer linkBuffer(jit, codeBlock, JITCompilationMustSucceed);
    linkBuffer.link(params.doneJumps, m_done);
    if (m_exceptionTarget)
        linkBuffer.link(exceptionJumps, m_exceptionTarget);
    m_stub = FINALIZE_CODE_FOR(codeBlock, linkBuffer, JITStubRoutinePtrTag, "Lazy slow path call stub");

    MacroAssembler::repatchJump(m_patchableJump, CodeLocationLabel<JITStubRoutinePtrTag>(m_stub.code()));
}

} } // namespace JSC::FTL

#endif // ENABLE(FTL_JIT)