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diff --git a/Source/JavaScriptCore/runtime/GenericArguments.h b/Source/JavaScriptCore/runtime/GenericArguments.h
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+/*
+ * Copyright (C) 2015 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. 
+ */
+
+#pragma once
+
+#include "JSObject.h"
+
+namespace JSC {
+
+// This is a mixin for the two kinds of Arguments-class objects that arise when you say
+// "arguments" inside a function. This class doesn't show up in the JSCell inheritance hierarchy.
+template<typename Type>
+class GenericArguments : public JSNonFinalObject {
+public:
+    typedef JSNonFinalObject Base;
+    static const unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | OverridesGetPropertyNames;
+
+protected:
+    GenericArguments(VM& vm, Structure* structure)
+        : Base(vm, structure)
+    {
+    }
+
+    static void visitChildren(JSCell*, SlotVisitor&);
+    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
+    static bool getOwnPropertySlotByIndex(JSObject*, ExecState*, unsigned propertyName, PropertySlot&);
+    static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
+    static bool put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
+    static bool putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
+    static bool deleteProperty(JSCell*, ExecState*, PropertyName);
+    static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
+    static bool defineOwnProperty(JSObject*, ExecState*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
+    
+    void initModifiedArgumentsDescriptor(VM&, unsigned length);
+    void initModifiedArgumentsDescriptorIfNecessary(VM&, unsigned length);
+    void setModifiedArgumentDescriptor(VM&, unsigned index, unsigned length);
+    bool isModifiedArgumentDescriptor(unsigned index, unsigned length);
+
+    void copyToArguments(ExecState*, VirtualRegister firstElementDest, unsigned offset, unsigned length);
+    
+    AuxiliaryBarrier<bool*> m_modifiedArgumentsDescriptor;
+};
+
+} // namespace JSC