mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
130 lines
3.6 KiB
C++
130 lines
3.6 KiB
C++
/*
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* Copyright (C) 2014-2018 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. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "DFGSafepoint.h"
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#if ENABLE(DFG_JIT)
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#include "DFGPlan.h"
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#include "DFGScannable.h"
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#include "DFGThreadData.h"
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#include "JSCInlines.h"
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namespace JSC { namespace DFG {
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Safepoint::Result::~Result()
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{
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RELEASE_ASSERT(m_wasChecked);
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}
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bool Safepoint::Result::didGetCancelled()
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{
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m_wasChecked = true;
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return m_didGetCancelled;
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}
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Safepoint::Safepoint(Plan& plan, Result& result)
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: m_vm(plan.vm())
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, m_plan(plan)
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, m_didCallBegin(false)
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, m_result(result)
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{
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RELEASE_ASSERT(result.m_wasChecked);
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result.m_wasChecked = false;
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result.m_didGetCancelled = false;
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}
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Safepoint::~Safepoint()
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{
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RELEASE_ASSERT(m_didCallBegin);
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if (ThreadData* data = m_plan.threadData()) {
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RELEASE_ASSERT(data->m_safepoint == this);
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data->m_rightToRun.lock();
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data->m_safepoint = nullptr;
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}
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}
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void Safepoint::add(Scannable* scannable)
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{
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RELEASE_ASSERT(!m_didCallBegin);
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m_scannables.append(scannable);
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}
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void Safepoint::begin()
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{
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RELEASE_ASSERT(!m_didCallBegin);
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m_didCallBegin = true;
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if (ThreadData* data = m_plan.threadData()) {
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RELEASE_ASSERT(!data->m_safepoint);
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data->m_safepoint = this;
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data->m_rightToRun.unlockFairly();
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}
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}
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void Safepoint::checkLivenessAndVisitChildren(SlotVisitor& visitor)
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{
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RELEASE_ASSERT(m_didCallBegin);
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if (m_result.m_didGetCancelled)
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return; // We were cancelled during a previous GC!
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if (!isKnownToBeLiveDuringGC())
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return;
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for (unsigned i = m_scannables.size(); i--;)
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m_scannables[i]->visitChildren(visitor);
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}
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bool Safepoint::isKnownToBeLiveDuringGC()
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{
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RELEASE_ASSERT(m_didCallBegin);
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if (m_result.m_didGetCancelled)
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return true; // We were cancelled during a previous GC, so let's not mess with it this time around - pretend it's live and move on.
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return m_plan.isKnownToBeLiveDuringGC();
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}
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void Safepoint::cancel()
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{
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RELEASE_ASSERT(m_didCallBegin);
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RELEASE_ASSERT(!m_result.m_didGetCancelled); // We cannot get cancelled twice because subsequent GCs will think that we're alive and they will not do anything to us.
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m_plan.cancel();
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m_result.m_didGetCancelled = true;
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m_vm = nullptr;
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}
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VM* Safepoint::vm() const
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{
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return m_vm;
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}
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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