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diff --git a/Source/JavaScriptCore/heap/HeapCellInlines.h b/Source/JavaScriptCore/heap/HeapCellInlines.h
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+++ b/Source/JavaScriptCore/heap/HeapCellInlines.h
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+/*
+ * Copyright (C) 2016 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. 
+ */
+
+#pragma once
+
+#include "CellContainer.h"
+#include "HeapCell.h"
+#include "LargeAllocation.h"
+#include "MarkedBlock.h"
+#include "VM.h"
+
+namespace JSC {
+
+ALWAYS_INLINE bool HeapCell::isLargeAllocation() const
+{
+    return LargeAllocation::isLargeAllocation(const_cast<HeapCell*>(this));
+}
+
+ALWAYS_INLINE CellContainer HeapCell::cellContainer() const
+{
+    if (isLargeAllocation())
+        return largeAllocation();
+    return markedBlock();
+}
+
+ALWAYS_INLINE MarkedBlock& HeapCell::markedBlock() const
+{
+    return *MarkedBlock::blockFor(this);
+}
+
+ALWAYS_INLINE LargeAllocation& HeapCell::largeAllocation() const
+{
+    return *LargeAllocation::fromCell(const_cast<HeapCell*>(this));
+}
+
+ALWAYS_INLINE Heap* HeapCell::heap() const
+{
+    return &vm()->heap;
+}
+
+ALWAYS_INLINE VM* HeapCell::vm() const
+{
+    if (isLargeAllocation())
+        return largeAllocation().vm();
+    return markedBlock().vm();
+}
+    
+ALWAYS_INLINE size_t HeapCell::cellSize() const
+{
+    if (isLargeAllocation())
+        return largeAllocation().cellSize();
+    return markedBlock().cellSize();
+}
+
+ALWAYS_INLINE AllocatorAttributes HeapCell::allocatorAttributes() const
+{
+    if (isLargeAllocation())
+        return largeAllocation().attributes();
+    return markedBlock().attributes();
+}
+
+ALWAYS_INLINE DestructionMode HeapCell::destructionMode() const
+{
+    return allocatorAttributes().destruction;
+}
+
+ALWAYS_INLINE HeapCell::Kind HeapCell::cellKind() const
+{
+    return allocatorAttributes().cellKind;
+}
+
+} // namespace JSC
+