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diff --git a/Source/JavaScriptCore/heap/HeapInlines.h b/Source/JavaScriptCore/heap/HeapInlines.h
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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 "JSCallee.h"
+#include "JSCell.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::collectorBelievesThatTheWorldIsStopped() const
+{
+    return m_collectorBelievesThatTheWorldIsStopped;
+}
+
+ALWAYS_INLINE bool Heap::isMarked(const void* rawCell)
+{
+    ASSERT(mayBeGCThread() != GCThreadType::Helper);
+    HeapCell* cell = bitwise_cast<HeapCell*>(rawCell);
+    if (cell->isLargeAllocation())
+        return cell->largeAllocation().isMarked();
+    MarkedBlock& block = cell->markedBlock();
+    return block.isMarked(
+        block.vm()->heap.objectSpace().markingVersion(), cell);
+}
+
+ALWAYS_INLINE bool Heap::isMarkedConcurrently(const void* rawCell)
+{
+    HeapCell* cell = bitwise_cast<HeapCell*>(rawCell);
+    if (cell->isLargeAllocation())
+        return cell->largeAllocation().isMarked();
+    MarkedBlock& block = cell->markedBlock();
+    return block.isMarkedConcurrently(
+        block.vm()->heap.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();
+    block.aboutToMark(markingVersion);
+    return block.testAndSetMarked(cell);
+}
+
+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<bool(CodeBlock*)>(func));
+}
+
+template<typename Functor> inline void Heap::forEachCodeBlockIgnoringJITPlans(const Functor& func)
+{
+    forEachCodeBlockIgnoringJITPlansImpl(scopedLambdaRef<bool(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
+
+inline void Heap::incrementDeferralDepth()
+{
+    ASSERT(!mayBeGCThread() || m_collectorBelievesThatTheWorldIsStopped);
+    m_deferralDepth++;
+}
+
+inline void Heap::decrementDeferralDepth()
+{
+    ASSERT(!mayBeGCThread() || m_collectorBelievesThatTheWorldIsStopped);
+    m_deferralDepth--;
+}
+
+inline void Heap::decrementDeferralDepthAndGCIfNeeded()
+{
+    ASSERT(!mayBeGCThread() || m_collectorBelievesThatTheWorldIsStopped);
+    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 (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 (mayNeedToStop())
+        stopIfNecessarySlow();
+}
+
+} // namespace JSC