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/*
* Copyright (C) 2014-2017 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.
*/
#pragma once
#include "GCDeferralContext.h"
#include "Heap.h"
#include "HeapCellInlines.h"
#include "IndexingHeader.h"
#include "JSCast.h"
#include "Structure.h"
#include <type_traits>
#include <wtf/Assertions.h>
#include <wtf/MainThread.h>
#include <wtf/RandomNumber.h>
namespace JSC {
ALWAYS_INLINE VM* Heap::vm() const
{
return bitwise_cast<VM*>(bitwise_cast<uintptr_t>(this) - OBJECT_OFFSETOF(VM, heap));
}
ALWAYS_INLINE Heap* Heap::heap(const HeapCell* cell)
{
if (!cell)
return nullptr;
return cell->heap();
}
inline Heap* Heap::heap(const JSValue v)
{
if (!v.isCell())
return nullptr;
return heap(v.asCell());
}
inline bool Heap::hasHeapAccess() const
{
return m_worldState.load() & hasAccessBit;
}
inline bool Heap::worldIsStopped() const
{
return m_worldIsStopped;
}
ALWAYS_INLINE bool Heap::isMarked(const void* rawCell)
{
HeapCell* cell = bitwise_cast<HeapCell*>(rawCell);
if (cell->isLargeAllocation())
return cell->largeAllocation().isMarked();
MarkedBlock& block = cell->markedBlock();
return block.isMarked(m_objectSpace.markingVersion(), cell);
}
ALWAYS_INLINE bool Heap::testAndSetMarked(HeapVersion markingVersion, const void* rawCell)
{
HeapCell* cell = bitwise_cast<HeapCell*>(rawCell);
if (cell->isLargeAllocation())
return cell->largeAllocation().testAndSetMarked();
MarkedBlock& block = cell->markedBlock();
Dependency dependency = block.aboutToMark(markingVersion);
return block.testAndSetMarked(cell, dependency);
}
ALWAYS_INLINE size_t Heap::cellSize(const void* rawCell)
{
return bitwise_cast<HeapCell*>(rawCell)->cellSize();
}
inline void Heap::writeBarrier(const JSCell* from, JSValue to)
{
#if ENABLE(WRITE_BARRIER_PROFILING)
WriteBarrierCounters::countWriteBarrier();
#endif
if (!to.isCell())
return;
writeBarrier(from, to.asCell());
}
inline void Heap::writeBarrier(const JSCell* from, JSCell* to)
{
#if ENABLE(WRITE_BARRIER_PROFILING)
WriteBarrierCounters::countWriteBarrier();
#endif
if (!from)
return;
if (!isWithinThreshold(from->cellState(), barrierThreshold()))
return;
if (LIKELY(!to))
return;
writeBarrierSlowPath(from);
}
inline void Heap::writeBarrier(const JSCell* from)
{
ASSERT_GC_OBJECT_LOOKS_VALID(const_cast<JSCell*>(from));
if (!from)
return;
if (UNLIKELY(isWithinThreshold(from->cellState(), barrierThreshold())))
writeBarrierSlowPath(from);
}
inline void Heap::writeBarrierWithoutFence(const JSCell* from)
{
ASSERT_GC_OBJECT_LOOKS_VALID(const_cast<JSCell*>(from));
if (!from)
return;
if (UNLIKELY(isWithinThreshold(from->cellState(), blackThreshold)))
addToRememberedSet(from);
}
inline void Heap::mutatorFence()
{
if (isX86() || UNLIKELY(mutatorShouldBeFenced()))
WTF::storeStoreFence();
}
template<typename Functor> inline void Heap::forEachCodeBlock(const Functor& func)
{
forEachCodeBlockImpl(scopedLambdaRef<void(CodeBlock*)>(func));
}
template<typename Functor> inline void Heap::forEachCodeBlockIgnoringJITPlans(const AbstractLocker& codeBlockSetLocker, const Functor& func)
{
forEachCodeBlockIgnoringJITPlansImpl(codeBlockSetLocker, scopedLambdaRef<void(CodeBlock*)>(func));
}
template<typename Functor> inline void Heap::forEachProtectedCell(const Functor& functor)
{
for (auto& pair : m_protectedValues)
functor(pair.key);
m_handleSet.forEachStrongHandle(functor, m_protectedValues);
}
#if USE(FOUNDATION)
template <typename T>
inline void Heap::releaseSoon(RetainPtr<T>&& object)
{
m_delayedReleaseObjects.append(WTFMove(object));
}
#endif
#if USE(GLIB)
inline void Heap::releaseSoon(std::unique_ptr<JSCGLibWrapperObject>&& object)
{
m_delayedReleaseObjects.append(WTFMove(object));
}
#endif
inline void Heap::incrementDeferralDepth()
{
ASSERT(!Thread::mayBeGCThread() || m_worldIsStopped);
m_deferralDepth++;
}
inline void Heap::decrementDeferralDepth()
{
ASSERT(!Thread::mayBeGCThread() || m_worldIsStopped);
m_deferralDepth--;
}
inline void Heap::decrementDeferralDepthAndGCIfNeeded()
{
ASSERT(!Thread::mayBeGCThread() || m_worldIsStopped);
m_deferralDepth--;
if (UNLIKELY(m_didDeferGCWork)) {
decrementDeferralDepthAndGCIfNeededSlow();
// Here are the possible relationships between m_deferralDepth and m_didDeferGCWork.
// Note that prior to the call to decrementDeferralDepthAndGCIfNeededSlow,
// m_didDeferGCWork had to have been true. Now it can be either false or true. There is
// nothing we can reliably assert.
//
// Possible arrangements of m_didDeferGCWork and !!m_deferralDepth:
//
// Both false: We popped out of all DeferGCs and we did whatever work was deferred.
//
// Only m_didDeferGCWork is true: We stopped for GC and the GC did DeferGC. This is
// possible because of how we handle the baseline JIT's worklist. It's also perfectly
// safe because it only protects reportExtraMemory. We can just ignore this.
//
// Only !!m_deferralDepth is true: m_didDeferGCWork had been set spuriously. It is only
// cleared by decrementDeferralDepthAndGCIfNeededSlow(). So, if we had deferred work but
// then decrementDeferralDepth()'d, then we might have the bit set even if we GC'd since
// then.
//
// Both true: We're in a recursive ~DeferGC. We wanted to do something about the
// deferred work, but were unable to.
}
}
inline HashSet<MarkedArgumentBuffer*>& Heap::markListSet()
{
if (!m_markListSet)
m_markListSet = std::make_unique<HashSet<MarkedArgumentBuffer*>>();
return *m_markListSet;
}
inline void Heap::reportExtraMemoryAllocated(size_t size)
{
if (size > minExtraMemory)
reportExtraMemoryAllocatedSlowCase(size);
}
inline void Heap::deprecatedReportExtraMemory(size_t size)
{
if (size > minExtraMemory)
deprecatedReportExtraMemorySlowCase(size);
}
inline void Heap::acquireAccess()
{
if (validateDFGDoesGC)
RELEASE_ASSERT(expectDoesGC());
if (m_worldState.compareExchangeWeak(0, hasAccessBit))
return;
acquireAccessSlow();
}
inline bool Heap::hasAccess() const
{
return m_worldState.loadRelaxed() & hasAccessBit;
}
inline void Heap::releaseAccess()
{
if (m_worldState.compareExchangeWeak(hasAccessBit, 0))
return;
releaseAccessSlow();
}
inline bool Heap::mayNeedToStop()
{
return m_worldState.loadRelaxed() != hasAccessBit;
}
inline void Heap::stopIfNecessary()
{
if (validateDFGDoesGC)
RELEASE_ASSERT(expectDoesGC());
if (mayNeedToStop())
stopIfNecessarySlow();
}
template<typename Func>
void Heap::forEachSlotVisitor(const Func& func)
{
auto locker = holdLock(m_parallelSlotVisitorLock);
func(*m_collectorSlotVisitor);
func(*m_mutatorSlotVisitor);
for (auto& slotVisitor : m_parallelSlotVisitors)
func(*slotVisitor);
}
inline unsigned Heap::numberOfSlotVisitors()
{
auto locker = holdLock(m_parallelSlotVisitorLock);
return m_parallelSlotVisitors.size() + 2; // m_collectorSlotVisitor and m_mutatorSlotVisitor
}
} // namespace JSC