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diff --git a/Source/JavaScriptCore/heap/BumpSpace.h b/Source/JavaScriptCore/heap/BumpSpace.h
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+++ b/Source/JavaScriptCore/heap/BumpSpace.h
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+/*
+ * Copyright (C) 2011 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. 
+ */
+
+#ifndef BumpSpace_h
+#define BumpSpace_h
+
+#include "HeapBlock.h"
+#include "TinyBloomFilter.h"
+#include <wtf/Assertions.h>
+#include <wtf/CheckedBoolean.h>
+#include <wtf/DoublyLinkedList.h>
+#include <wtf/HashSet.h>
+#include <wtf/OSAllocator.h>
+#include <wtf/PageAllocationAligned.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/ThreadingPrimitives.h>
+
+namespace JSC {
+
+class Heap;
+class BumpBlock;
+class HeapBlock;
+
+class BumpSpace {
+    friend class SlotVisitor;
+public:
+    BumpSpace(Heap*);
+    void init();
+
+    CheckedBoolean tryAllocate(size_t, void**);
+    CheckedBoolean tryReallocate(void**, size_t, size_t);
+    
+    void startedCopying();
+    void doneCopying();
+    bool isInCopyPhase() { return m_inCopyingPhase; }
+
+    void pin(BumpBlock*);
+    bool isPinned(void*);
+
+    bool contains(void*, BumpBlock*&);
+
+    size_t totalMemoryAllocated() { return m_totalMemoryAllocated; }
+    size_t totalMemoryUtilized() { return m_totalMemoryUtilized; }
+
+    static BumpBlock* blockFor(void*);
+
+private:
+    CheckedBoolean tryAllocateSlowCase(size_t, void**);
+    CheckedBoolean addNewBlock();
+    CheckedBoolean allocateNewBlock(BumpBlock**);
+    bool fitsInCurrentBlock(size_t);
+    
+    static void* allocateFromBlock(BumpBlock*, size_t);
+    CheckedBoolean tryAllocateOversize(size_t, void**);
+    CheckedBoolean tryReallocateOversize(void**, size_t, size_t);
+    
+    static bool isOversize(size_t);
+    
+    CheckedBoolean borrowBlock(BumpBlock**);
+    CheckedBoolean getFreshBlock(AllocationEffort, BumpBlock**);
+    void doneFillingBlock(BumpBlock*);
+    void recycleBlock(BumpBlock*);
+    static bool fitsInBlock(BumpBlock*, size_t);
+    static BumpBlock* oversizeBlockFor(void* ptr);
+
+    Heap* m_heap;
+
+    BumpBlock* m_currentBlock;
+
+    TinyBloomFilter m_toSpaceFilter;
+    TinyBloomFilter m_oversizeFilter;
+    HashSet<BumpBlock*> m_toSpaceSet;
+
+    Mutex m_toSpaceLock;
+    Mutex m_memoryStatsLock;
+
+    DoublyLinkedList<HeapBlock>* m_toSpace;
+    DoublyLinkedList<HeapBlock>* m_fromSpace;
+    
+    DoublyLinkedList<HeapBlock> m_blocks1;
+    DoublyLinkedList<HeapBlock> m_blocks2;
+    DoublyLinkedList<HeapBlock> m_oversizeBlocks;
+   
+    size_t m_totalMemoryAllocated;
+    size_t m_totalMemoryUtilized;
+
+    bool m_inCopyingPhase;
+
+    Mutex m_loanedBlocksLock; 
+    ThreadCondition m_loanedBlocksCondition;
+    size_t m_numberOfLoanedBlocks;
+
+    static const size_t s_blockSize = 64 * KB;
+    static const size_t s_maxAllocationSize = 32 * KB;
+    static const size_t s_pageSize = 4 * KB;
+    static const size_t s_pageMask = ~(s_pageSize - 1);
+    static const size_t s_initialBlockNum = 16;
+    static const size_t s_blockMask = ~(s_blockSize - 1);
+};
+
+} // namespace JSC
+
+#endif