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diff --git a/Source/JavaScriptCore/runtime/JSWeakMap.h b/Source/JavaScriptCore/runtime/JSWeakMap.h
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+++ b/Source/JavaScriptCore/runtime/JSWeakMap.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. ``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 JSWeakMap_h
+#define JSWeakMap_h
+
+#include "JSObject.h"
+
+namespace JSC {
+
+class WeakMapData;
+
+class JSWeakMap : public JSNonFinalObject {
+public:
+    typedef JSNonFinalObject Base;
+
+    DECLARE_EXPORT_INFO;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
+    }
+
+    static JSWeakMap* create(VM& vm, Structure* structure)
+    {
+        JSWeakMap* instance = new (NotNull, allocateCell<JSWeakMap>(vm.heap)) JSWeakMap(vm, structure);
+        instance->finishCreation(vm);
+        return instance;
+    }
+
+    static JSWeakMap* create(ExecState* exec, Structure* structure)
+    {
+        return create(exec->vm(), structure);
+    }
+
+    WeakMapData* weakMapData() { return m_weakMapData.get(); }
+
+    JSValue get(CallFrame*, JSObject*);
+    bool has(CallFrame*, JSObject*);
+    bool remove(CallFrame*, JSObject*);
+
+    void set(CallFrame*, JSObject*, JSValue);
+    void clear(CallFrame*);
+
+private:
+    JSWeakMap(VM& vm, Structure* structure)
+        : Base(vm, structure)
+    {
+    }
+
+    void finishCreation(VM&);
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    WriteBarrier<WeakMapData> m_weakMapData;
+};
+
+}
+
+#endif // !defined(JSWeakMap_h)