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diff --git a/Source/JavaScriptCore/runtime/SparseArrayValueMap.h b/Source/JavaScriptCore/runtime/SparseArrayValueMap.h
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+++ b/Source/JavaScriptCore/runtime/SparseArrayValueMap.h
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+/*
+ * Copyright (C) 2011, 2012 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 SparseArrayValueMap_h
+#define SparseArrayValueMap_h
+
+#include "JSCell.h"
+#include "JSTypeInfo.h"
+#include "PropertyDescriptor.h"
+#include "PutDirectIndexMode.h"
+#include "WriteBarrier.h"
+#include <wtf/HashMap.h>
+
+namespace JSC {
+
+class SparseArrayValueMap;
+
+struct SparseArrayEntry : public WriteBarrier<Unknown> {
+    typedef WriteBarrier<Unknown> Base;
+
+    SparseArrayEntry() : attributes(0) { }
+
+    JSValue get(ExecState*, JSObject*) const;
+    void get(JSObject*, PropertySlot&) const;
+    void get(PropertyDescriptor&) const;
+    void put(ExecState*, JSValue thisValue, SparseArrayValueMap*, JSValue, bool shouldThrow);
+    JSValue getNonSparseMode() const;
+
+    unsigned attributes;
+};
+
+class SparseArrayValueMap final : public JSCell {
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
+    
+private:
+    typedef HashMap<uint64_t, SparseArrayEntry, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t>> Map;
+
+    enum Flags {
+        Normal = 0,
+        SparseMode = 1,
+        LengthIsReadOnly = 2,
+    };
+
+    SparseArrayValueMap(VM&);
+    ~SparseArrayValueMap();
+    
+    void finishCreation(VM&);
+
+public:
+    DECLARE_EXPORT_INFO;
+    
+    typedef Map::iterator iterator;
+    typedef Map::const_iterator const_iterator;
+    typedef Map::AddResult AddResult;
+
+    static SparseArrayValueMap* create(VM&);
+    
+    static const bool needsDestruction = true;
+    static void destroy(JSCell*);
+    
+    static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    bool sparseMode()
+    {
+        return m_flags & SparseMode;
+    }
+
+    void setSparseMode()
+    {
+        m_flags = static_cast<Flags>(m_flags | SparseMode);
+    }
+
+    bool lengthIsReadOnly()
+    {
+        return m_flags & LengthIsReadOnly;
+    }
+
+    void setLengthIsReadOnly()
+    {
+        m_flags = static_cast<Flags>(m_flags | LengthIsReadOnly);
+    }
+
+    // These methods may mutate the contents of the map
+    void putEntry(ExecState*, JSObject*, unsigned, JSValue, bool shouldThrow);
+    bool putDirect(ExecState*, JSObject*, unsigned, JSValue, unsigned attributes, PutDirectIndexMode);
+    AddResult add(JSObject*, unsigned);
+    iterator find(unsigned i) { return m_map.find(i); }
+    // This should ASSERT the remove is valid (check the result of the find).
+    void remove(iterator it) { m_map.remove(it); }
+    void remove(unsigned i) { m_map.remove(i); }
+
+    // These methods do not mutate the contents of the map.
+    iterator notFound() { return m_map.end(); }
+    bool isEmpty() const { return m_map.isEmpty(); }
+    bool contains(unsigned i) const { return m_map.contains(i); }
+    size_t size() const { return m_map.size(); }
+    // Only allow const begin/end iteration.
+    const_iterator begin() const { return m_map.begin(); }
+    const_iterator end() const { return m_map.end(); }
+
+private:
+    Map m_map;
+    Flags m_flags;
+    size_t m_reportedCapacity;
+};
+
+} // namespace JSC
+
+#endif // SparseArrayValueMap_h
+