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diff --git a/Source/JavaScriptCore/runtime/ProxyObject.h b/Source/JavaScriptCore/runtime/ProxyObject.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. 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 ProxyObject_h
+#define ProxyObject_h
+
+#include "JSGlobalObject.h"
+#include "JSObject.h"
+
+namespace JSC {
+
+class ProxyObject : public JSNonFinalObject {
+public:
+    typedef JSNonFinalObject Base;
+
+    const static unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot;
+
+    static ProxyObject* create(ExecState* exec, Structure* structure, JSValue target, JSValue handler)
+    {
+        VM& vm = exec->vm();
+        ProxyObject* proxy = new (NotNull, allocateCell<ProxyObject>(vm.heap)) ProxyObject(vm, structure);
+        proxy->finishCreation(vm, exec, target, handler);
+        return proxy;
+    }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info()); 
+    }
+
+    DECLARE_EXPORT_INFO;
+
+    JSObject* target() { return m_target.get(); }
+    JSValue handler() { return m_handler.get(); }
+
+private:
+    ProxyObject(VM&, Structure*);
+    void finishCreation(VM&, ExecState*, JSValue target, JSValue handler);
+
+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
+    static bool getOwnPropertySlotByIndex(JSObject*, ExecState*, unsigned propertyName, PropertySlot&);
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+    bool getOwnPropertySlotCommon(ExecState*, PropertyName, PropertySlot&);
+    bool performInternalMethodGetOwnProperty(ExecState*, PropertyName, PropertySlot&);
+    bool performHasProperty(ExecState*, PropertyName, PropertySlot&);
+
+    WriteBarrier<JSObject> m_target;
+    WriteBarrier<Unknown> m_handler;
+};
+
+} // namespace JSC
+
+#endif // JSPromise_h