WebKit/Source/JavaScriptCore/jit/JITSafepoint.cpp at main · WebKit/WebKit · GitHub

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* 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 "JITSafepoint.h"

#if ENABLE(JIT)

#include "JITPlan.h"

#include "JITScannable.h"

#include "JITWorklistThread.h"

#include "SlotVisitor.h"

namespace JSC {

Safepoint::Result::~Result()

{

RELEASE_ASSERT(m_wasChecked);

}

bool Safepoint::Result::didGetCancelled()

{

m_wasChecked = true;

return m_didGetCancelled;

}

Safepoint::Safepoint(JITPlan& plan, Result& result)

: m_vm(plan.vm())

, m_plan(plan)

, m_didCallBegin(false)

, m_result(result)

{

RELEASE_ASSERT(result.m_wasChecked);

result.m_wasChecked = false;

result.m_didGetCancelled = false;

}

Safepoint::~Safepoint()

{

RELEASE_ASSERT(m_didCallBegin);

if (RefPtr thread = m_plan.thread()) {

RELEASE_ASSERT(thread->m_safepoint == this);

thread->m_rightToRun.lock();

thread->m_safepoint = nullptr;

}

void Safepoint::add(Scannable* scannable)

{

RELEASE_ASSERT(!m_didCallBegin);

m_scannables.append(scannable);

}

void Safepoint::begin(bool keepDependenciesLive) WTF_IGNORES_THREAD_SAFETY_ANALYSIS

{

RELEASE_ASSERT(!m_didCallBegin);

m_didCallBegin = true;

m_keepDependenciesLive = keepDependenciesLive;

if (RefPtr data = m_plan.thread()) {

RELEASE_ASSERT(!data->m_safepoint);

data->m_safepoint = this;

data->m_rightToRun.unlockFairly();

}

template<typename Visitor>

void Safepoint::checkLivenessAndVisitChildren(Visitor& visitor)

{

RELEASE_ASSERT(m_didCallBegin);

if (m_result.m_didGetCancelled)

return; // We were cancelled during a previous GC!

if (!isKnownToBeLiveDuringGC(visitor))

return;

for (unsigned i = m_scannables.size(); i--;)

m_scannables[i]->visitChildren(visitor);

}

template void Safepoint::checkLivenessAndVisitChildren(AbstractSlotVisitor&);

template void Safepoint::checkLivenessAndVisitChildren(SlotVisitor&);

template<typename Visitor>

bool Safepoint::isKnownToBeLiveDuringGC(Visitor& visitor)

{

RELEASE_ASSERT(m_didCallBegin);

if (m_result.m_didGetCancelled)

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.

return m_plan.isKnownToBeLiveDuringGC(visitor);

}

template bool Safepoint::isKnownToBeLiveDuringGC(AbstractSlotVisitor&);

template bool Safepoint::isKnownToBeLiveDuringGC(SlotVisitor&);

bool Safepoint::isKnownToBeLiveAfterGC()

{

RELEASE_ASSERT(m_didCallBegin);

if (m_result.m_didGetCancelled)

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.

return m_plan.isKnownToBeLiveAfterGC();

}

void Safepoint::cancel()

{

RELEASE_ASSERT(m_didCallBegin);

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.

RELEASE_ASSERT(m_plan.stage() == JITPlanStage::Canceled);

m_result.m_didGetCancelled = true;

m_vm = nullptr;

}

bool Safepoint::keepDependenciesLive() const

{

return m_keepDependenciesLive;

}

VM* Safepoint::vm() const

{

return m_vm;

}

} // namespace JSC

#endif // ENABLE(JIT)

WebKit/Source/JavaScriptCore/jit/JITSafepoint.cpp at main · WebKit/WebKit · GitHub

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