167 lines
5.2 KiB
C++
167 lines
5.2 KiB
C++
/*
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* Copyright (C) 2021 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 "JITWorklistThread.h"
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#if ENABLE(JIT)
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#include "HeapInlines.h"
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#include "JITWorklist.h"
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#include "VM.h"
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namespace JSC {
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class JITWorklistThread::WorkScope final {
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public:
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WorkScope(JITWorklistThread& thread)
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: m_thread(thread)
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, m_tier(thread.m_plan->tier())
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{
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RELEASE_ASSERT(m_thread.m_plan);
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RELEASE_ASSERT(m_thread.m_worklist.m_numberOfActiveThreads);
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}
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~WorkScope()
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{
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Locker locker { *m_thread.m_worklist.m_lock };
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m_thread.m_plan = nullptr;
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m_thread.m_worklist.m_numberOfActiveThreads--;
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m_thread.m_worklist.m_ongoingCompilationsPerTier[static_cast<unsigned>(m_tier)]--;
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}
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private:
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JITWorklistThread& m_thread;
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JITPlan::Tier m_tier;
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};
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JITWorklistThread::JITWorklistThread(const AbstractLocker& locker, JITWorklist& worklist)
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: AutomaticThread(locker, worklist.m_lock, worklist.m_planEnqueued.copyRef(), ThreadType::Compiler)
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, m_worklist(worklist)
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{
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}
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const char* JITWorklistThread::name() const
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{
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#if OS(LINUX)
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return "JITWorker";
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#else
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return "JIT Worklist Helper Thread";
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#endif
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}
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auto JITWorklistThread::poll(const AbstractLocker& locker) -> PollResult
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{
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for (unsigned i = 0; i < static_cast<unsigned>(JITPlan::Tier::Count); ++i) {
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auto& queue = m_worklist.m_queues[i];
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if (queue.isEmpty())
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continue;
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if (m_worklist.m_ongoingCompilationsPerTier[i] >= m_worklist.m_maximumNumberOfConcurrentCompilationsPerTier[i])
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continue;
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m_plan = queue.takeFirst();
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if (UNLIKELY(!m_plan)) {
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if (Options::verboseCompilationQueue()) {
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m_worklist.dump(locker, WTF::dataFile());
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dataLog(": Thread shutting down\n");
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}
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return PollResult::Stop;
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}
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RELEASE_ASSERT(m_plan->stage() == JITPlanStage::Preparing);
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m_worklist.m_numberOfActiveThreads++;
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m_worklist.m_ongoingCompilationsPerTier[i]++;
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return PollResult::Work;
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}
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return PollResult::Wait;
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}
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auto JITWorklistThread::work() -> WorkResult
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{
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WorkScope workScope(*this);
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Locker locker { m_rightToRun };
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{
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Locker locker { *m_worklist.m_lock };
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if (m_plan->stage() == JITPlanStage::Canceled)
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return WorkResult::Continue;
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m_plan->notifyCompiling();
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}
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dataLogLnIf(Options::verboseCompilationQueue(), m_worklist, ": Compiling ", m_plan->key(), " asynchronously");
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// There's no way for the GC to be safepointing since we own rightToRun.
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if (m_plan->vm()->heap.worldIsStopped()) {
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dataLog("Heap is stopped but here we are! (1)\n");
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RELEASE_ASSERT_NOT_REACHED();
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}
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m_plan->compileInThread(this);
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if (m_plan->stage() != JITPlanStage::Canceled) {
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if (m_plan->vm()->heap.worldIsStopped()) {
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dataLog("Heap is stopped but here we are! (2)\n");
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RELEASE_ASSERT_NOT_REACHED();
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}
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}
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{
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Locker locker { *m_worklist.m_lock };
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if (m_plan->stage() == JITPlanStage::Canceled)
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return WorkResult::Continue;
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m_plan->notifyReady();
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if (Options::verboseCompilationQueue()) {
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m_worklist.dump(locker, WTF::dataFile());
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dataLog(": Compiled ", m_plan->key(), " asynchronously\n");
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}
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RELEASE_ASSERT(!m_plan->vm()->heap.worldIsStopped());
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m_worklist.m_readyPlans.append(WTFMove(m_plan));
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m_worklist.m_planCompiledOrCancelled.notifyAll();
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}
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return WorkResult::Continue;
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}
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void JITWorklistThread::threadDidStart()
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{
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dataLogLnIf(Options::verboseCompilationQueue(), m_worklist, ": Thread started");
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}
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void JITWorklistThread::threadIsStopping(const AbstractLocker&)
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{
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dataLogLnIf(Options::verboseCompilationQueue(), m_worklist, ": Thread will stop");
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ASSERT(!m_plan);
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m_plan = nullptr;
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}
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} // namespace JSC
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#endif // ENABLE(JIT)
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