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diff --git a/Source/JavaScriptCore/runtime/JSCustomGetterSetterFunction.h b/Source/JavaScriptCore/runtime/JSCustomGetterSetterFunction.h
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+++ b/Source/JavaScriptCore/runtime/JSCustomGetterSetterFunction.h
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+/*
+ * Copyright (C) 2015, 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.
+ */
+
+#pragma once
+
+#include "JSFunction.h"
+
+namespace JSC {
+
+class CustomGetterSetter;
+
+class JSCustomGetterSetterFunction : public JSFunction {
+public:
+    typedef JSFunction Base;
+
+    // The Type is set to the number of arguments the resultant function will have.
+    enum class Type { Getter = 0, Setter = 1 };
+
+    static const unsigned StructureFlags = Base::StructureFlags;
+
+    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
+    {
+        ASSERT(globalObject);
+        return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
+    }
+
+    static JSCustomGetterSetterFunction* create(VM&, JSGlobalObject*, CustomGetterSetter*, const Type, const PropertyName&);
+
+    DECLARE_EXPORT_INFO;
+
+protected:
+    static void visitChildren(JSCell*, SlotVisitor&);
+
+private:
+    JSCustomGetterSetterFunction(VM&, JSGlobalObject*, Structure*, Type, const PropertyName&);
+    void finishCreation(VM&, NativeExecutable*, CustomGetterSetter*, const String&);
+
+    static EncodedJSValue JSC_HOST_CALL customGetterSetterFunctionCall(ExecState*);
+
+    CustomGetterSetter* customGetterSetter() const { return m_getterSetter.get(); }
+    bool isSetter() const { return m_type == Type::Setter; }
+    const PropertyName& propertyName() const { return m_propertyName; }
+
+    WriteBarrier<CustomGetterSetter> m_getterSetter;
+    Type m_type;
+    PropertyName m_propertyName;
+};
+
+} // namespace JSC