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diff --git a/Source/JavaScriptCore/runtime/WeakMapData.h b/Source/JavaScriptCore/runtime/WeakMapData.h
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+/*
+ * Copyright (C) 2013 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.
+ */
+
+#ifndef WeakMapData_h
+#define WeakMapData_h
+
+#include "JSCell.h"
+#include "Structure.h"
+#include <wtf/HashFunctions.h>
+#include <wtf/HashMap.h>
+#include <wtf/MathExtras.h>
+
+namespace JSC {
+
+class WeakMapData final : public JSCell {
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
+
+    static WeakMapData* create(VM& vm)
+    {
+        WeakMapData* weakMapData = new (NotNull, allocateCell<WeakMapData>(vm.heap)) WeakMapData(vm);
+        weakMapData->finishCreation(vm);
+        return weakMapData;
+    }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
+    }
+
+    static const bool needsDestruction = true;
+
+    void set(VM&, JSObject*, JSValue);
+    JSValue get(JSObject*);
+    bool remove(JSObject*);
+    bool contains(JSObject*);
+    void clear();
+
+    DECLARE_INFO;
+
+    typedef HashMap<JSObject*, WriteBarrier<Unknown>> MapType;
+    MapType::const_iterator begin() const { return m_map.begin(); }
+    MapType::const_iterator end() const { return m_map.end(); }
+
+    int size() const { return m_map.size(); }
+
+private:
+    WeakMapData(VM&);
+    static void destroy(JSCell*);
+    static size_t estimatedSize(JSCell*);
+    static void visitChildren(JSCell*, SlotVisitor&);
+    void finishCreation(VM&);
+
+    class DeadKeyCleaner : public UnconditionalFinalizer, public WeakReferenceHarvester {
+    public:
+        DeadKeyCleaner(WeakMapData* target)
+            : m_target(target)
+        {
+        }
+    private:
+        virtual void visitWeakReferences(SlotVisitor&) override;
+        virtual void finalizeUnconditionally() override;
+        unsigned m_liveKeyCount;
+        WeakMapData* m_target;
+    };
+    DeadKeyCleaner m_deadKeyCleaner;
+    MapType m_map;
+};
+
+}
+
+#endif /* !defined(WeakMapData_h) */