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/*
* Copyright (C) 2021 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
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JITWorklistThread.h"
#if ENABLE(JIT)
#include "HeapInlines.h"
#include "JITWorklist.h"
#include "VM.h"
namespace JSC {
class JITWorklistThread::WorkScope final {
public:
WorkScope(JITWorklistThread& thread)
: m_thread(thread)
, m_tier(thread.m_plan->tier())
{
RELEASE_ASSERT(m_thread.m_plan);
RELEASE_ASSERT(m_thread.m_worklist.m_numberOfActiveThreads);
}
~WorkScope()
{
Locker locker { *m_thread.m_worklist.m_lock };
m_thread.m_plan = nullptr;
m_thread.m_worklist.m_numberOfActiveThreads--;
m_thread.m_worklist.m_ongoingCompilationsPerTier[static_cast<unsigned>(m_tier)]--;
}
private:
JITWorklistThread& m_thread;
JITPlan::Tier m_tier;
};
JITWorklistThread::JITWorklistThread(const AbstractLocker& locker, JITWorklist& worklist)
: AutomaticThread(locker, worklist.m_lock, worklist.m_planEnqueued.copyRef(), ThreadType::Compiler)
, m_worklist(worklist)
{
}
ASCIILiteral JITWorklistThread::name() const
{
#if OS(LINUX)
return "JITWorker"_s;
#else
return "JIT Worklist Helper Thread"_s;
#endif
}
auto JITWorklistThread::poll(const AbstractLocker& locker) -> PollResult
{
for (unsigned i = 0; i < static_cast<unsigned>(JITPlan::Tier::Count); ++i) {
auto& queue = m_worklist.m_queues[i];
if (queue.isEmpty())
continue;
if (m_worklist.m_ongoingCompilationsPerTier[i] >= m_worklist.m_maximumNumberOfConcurrentCompilationsPerTier[i])
continue;
m_plan = queue.takeFirst();
if (UNLIKELY(!m_plan)) {
if (Options::verboseCompilationQueue()) {
m_worklist.dump(locker, WTF::dataFile());
dataLog(": Thread shutting down\n");
}
return PollResult::Stop;
}
RELEASE_ASSERT(m_plan->stage() == JITPlanStage::Preparing);
m_worklist.m_numberOfActiveThreads++;
m_worklist.m_ongoingCompilationsPerTier[i]++;
return PollResult::Work;
}
return PollResult::Wait;
}
auto JITWorklistThread::work() -> WorkResult
{
WorkScope workScope(*this);
Locker locker { m_rightToRun };
{
Locker locker { *m_worklist.m_lock };
if (m_plan->stage() == JITPlanStage::Canceled)
return WorkResult::Continue;
m_state = State::Compiling;
m_plan->notifyCompiling();
}
dataLogLnIf(Options::verboseCompilationQueue(), m_worklist, ": Compiling ", m_plan->key(), " asynchronously");
// There's no way for the GC to be safepointing since we own rightToRun.
if (m_plan->vm()->heap.worldIsStopped()) {
dataLog("Heap is stopped but here we are! (1)\n");
RELEASE_ASSERT_NOT_REACHED();
}
m_plan->compileInThread(this);
if (m_plan->stage() != JITPlanStage::Canceled) {
if (m_plan->vm()->heap.worldIsStopped()) {
dataLog("Heap is stopped but here we are! (2)\n");
RELEASE_ASSERT_NOT_REACHED();
}
}
{
Locker locker { *m_worklist.m_lock };
m_state = State::NotCompiling;
if (m_plan->stage() == JITPlanStage::Canceled)
return WorkResult::Continue;
m_plan->notifyReady();
if (Options::verboseCompilationQueue()) {
m_worklist.dump(locker, WTF::dataFile());
dataLog(": Compiled ", m_plan->key(), " asynchronously\n");
}
RELEASE_ASSERT(!m_plan->vm()->heap.worldIsStopped());
m_worklist.m_readyPlans.append(WTFMove(m_plan));
m_worklist.m_planCompiledOrCancelled.notifyAll();
}
return WorkResult::Continue;
}
void JITWorklistThread::threadDidStart()
{
dataLogLnIf(Options::verboseCompilationQueue(), m_worklist, ": Thread started");
}
void JITWorklistThread::threadIsStopping(const AbstractLocker&)
{
dataLogLnIf(Options::verboseCompilationQueue(), m_worklist, ": Thread will stop");
ASSERT(!m_plan);
m_plan = nullptr;
}
} // namespace JSC
#endif // ENABLE(JIT)
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