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/*
* Copyright (C) 2017-2021 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. AND ITS CONTRIBUTORS ``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 ITS 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 "MarkStackMergingConstraint.h"
#include "GCSegmentedArrayInlines.h"
#include "JSCInlines.h"
#include <wtf/TZoneMallocInlines.h>
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(MarkStackMergingConstraint);
MarkStackMergingConstraint::MarkStackMergingConstraint(JSC::Heap& heap)
: MarkingConstraint("Msm"_s, "Mark Stack Merging"_s, ConstraintVolatility::GreyedByExecution)
, m_heap(heap)
{
}
MarkStackMergingConstraint::~MarkStackMergingConstraint() = default;
double MarkStackMergingConstraint::quickWorkEstimate(SlotVisitor&)
{
return m_heap.m_mutatorMarkStack->size() + m_heap.m_raceMarkStack->size();
}
void MarkStackMergingConstraint::prepareToExecuteImpl(const AbstractLocker&, AbstractSlotVisitor& visitor)
{
// Logging the work here ensures that the constraint solver knows that it doesn't need to produce
// anymore work.
size_t size = m_heap.m_mutatorMarkStack->size() + m_heap.m_raceMarkStack->size();
visitor.addToVisitCount(size);
dataLogIf(Options::logGC(), "(", size, ")");
}
template<typename Visitor>
void MarkStackMergingConstraint::executeImplImpl(Visitor& visitor)
{
// We want to skip this constraint for the GC verifier because:
// 1. There should be no mutator marking action between the End phase and verifyGC().
// Hence, we can ignore these stacks.
// 2. The End phase explicitly calls iterateExecutingAndCompilingCodeBlocks()
// to add executing CodeBlocks to m_heap.m_mutatorMarkStack. We want to
// leave those unperturbed.
if (m_heap.m_isMarkingForGCVerifier)
return;
m_heap.m_mutatorMarkStack->transferTo(visitor.mutatorMarkStack());
m_heap.m_raceMarkStack->transferTo(visitor.mutatorMarkStack());
}
void MarkStackMergingConstraint::executeImpl(AbstractSlotVisitor& visitor) { executeImplImpl(visitor); }
void MarkStackMergingConstraint::executeImpl(SlotVisitor& visitor) { executeImplImpl(visitor); }
} // namespace JSC
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