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diff --git a/Source/JavaScriptCore/runtime/CustomGetterSetter.h b/Source/JavaScriptCore/runtime/CustomGetterSetter.h
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+++ b/Source/JavaScriptCore/runtime/CustomGetterSetter.h
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+/*
+ * Copyright (C) 2014 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 CustomGetterSetter_h
+#define CustomGetterSetter_h
+
+#include "JSCell.h"
+#include "PropertySlot.h"
+#include "PutPropertySlot.h"
+#include "Structure.h"
+
+namespace JSC {
+
+class CustomGetterSetter final : public JSCell {
+public:
+    typedef JSCell Base;
+    static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
+
+    typedef PropertySlot::GetValueFunc CustomGetter;
+    typedef PutPropertySlot::PutValueFunc CustomSetter;
+
+    static CustomGetterSetter* create(VM& vm, CustomGetter customGetter, CustomSetter customSetter)
+    {
+        CustomGetterSetter* customGetterSetter = new (NotNull, allocateCell<CustomGetterSetter>(vm.heap)) CustomGetterSetter(vm, customGetter, customSetter);
+        customGetterSetter->finishCreation(vm);
+        return customGetterSetter;
+    }
+
+    CustomGetterSetter::CustomGetter getter() const { return m_getter; }
+    CustomGetterSetter::CustomSetter setter() const { return m_setter; }
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        return Structure::create(vm, globalObject, prototype, TypeInfo(CustomGetterSetterType, StructureFlags), info());
+    }
+        
+    DECLARE_EXPORT_INFO;
+
+private:
+    CustomGetterSetter(VM& vm, CustomGetter getter, CustomSetter setter)
+        : JSCell(vm, vm.customGetterSetterStructure.get())
+        , m_getter(getter)
+        , m_setter(setter)
+    {
+    }
+
+    CustomGetter m_getter;
+    CustomSetter m_setter;
+};
+
+JS_EXPORT_PRIVATE void callCustomSetter(ExecState*, JSValue customGetterSetter, bool isAccessor, JSObject* slotBase, JSValue thisValue, JSValue);
+
+} // namespace JSC
+
+#endif // CustomGetterSetter_h