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diff --git a/JavaScriptCore/runtime/JSVariableObject.h b/JavaScriptCore/runtime/JSVariableObject.h
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+/*
+ * Copyright (C) 2007, 2008 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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 JSVariableObject_h
+#define JSVariableObject_h
+
+#include "JSObject.h"
+#include "Register.h"
+#include "SymbolTable.h"
+#include "UnusedParam.h"
+#include <wtf/OwnArrayPtr.h>
+#include <wtf/UnusedParam.h>
+
+namespace JSC {
+
+    class Register;
+
+    class JSVariableObject : public JSObject {
+    public:
+        SymbolTable& symbolTable() const { return *d->symbolTable; }
+
+        virtual void putWithAttributes(ExecState*, const Identifier&, JSValue*, unsigned attributes) = 0;
+
+        virtual bool deleteProperty(ExecState*, const Identifier&);
+        virtual void getPropertyNames(ExecState*, PropertyNameArray&);
+        
+        virtual bool isVariableObject() const;
+        virtual bool isDynamicScope() const = 0;
+
+        virtual bool getPropertyAttributes(ExecState*, const Identifier& propertyName, unsigned& attributes) const;
+
+        Register& registerAt(int index) const { return d->registers[index]; }
+
+    protected:
+        // Subclasses of JSVariableObject can subclass this struct to add data
+        // without increasing their own size (since there's a hard limit on the
+        // size of a JSCell).
+        struct JSVariableObjectData {
+            JSVariableObjectData(SymbolTable* symbolTable, Register* registers)
+                : symbolTable(symbolTable)
+                , registers(registers)
+            {
+                ASSERT(symbolTable);
+            }
+
+            SymbolTable* symbolTable; // Maps name -> offset from "r" in register file.
+            Register* registers; // "r" in the register file.
+            OwnArrayPtr<Register> registerArray; // Independent copy of registers, used when a variable object copies its registers out of the register file.
+
+            static inline ptrdiff_t offsetOf_registers()
+            {
+                return OBJECT_OFFSET(JSVariableObjectData, registers);
+            }
+
+        private:
+            JSVariableObjectData(const JSVariableObjectData&);
+            JSVariableObjectData& operator=(const JSVariableObjectData&);
+        };
+
+        JSVariableObject(PassRefPtr<StructureID> structureID, JSVariableObjectData* data)
+            : JSObject(structureID)
+            , d(data) // Subclass owns this pointer.
+        {
+        }
+
+        Register* copyRegisterArray(Register* src, size_t count);
+        void setRegisters(Register* r, Register* registerArray);
+
+        bool symbolTableGet(const Identifier&, PropertySlot&);
+        bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
+        bool symbolTablePut(const Identifier&, JSValue*);
+        bool symbolTablePutWithAttributes(const Identifier&, JSValue*, unsigned attributes);
+
+        JSVariableObjectData* d;
+
+    public:
+        static inline ptrdiff_t offsetOf_d()
+        {
+            return OBJECT_OFFSET(JSVariableObject, d);
+        }
+
+        static inline ptrdiff_t offsetOf_Data_registers()
+        {
+            return JSVariableObjectData::offsetOf_registers();
+        }
+    };
+
+    inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
+    {
+        SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
+        if (!entry.isNull()) {
+            slot.setRegisterSlot(&registerAt(entry.getIndex()));
+            return true;
+        }
+        return false;
+    }
+
+    inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot, bool& slotIsWriteable)
+    {
+        SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
+        if (!entry.isNull()) {
+            slot.setRegisterSlot(&registerAt(entry.getIndex()));
+            slotIsWriteable = !entry.isReadOnly();
+            return true;
+        }
+        return false;
+    }
+
+    inline bool JSVariableObject::symbolTablePut(const Identifier& propertyName, JSValue* value)
+    {
+        ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+
+        SymbolTableEntry entry = symbolTable().inlineGet(propertyName.ustring().rep());
+        if (entry.isNull())
+            return false;
+        if (entry.isReadOnly())
+            return true;
+        registerAt(entry.getIndex()) = value;
+        return true;
+    }
+
+    inline bool JSVariableObject::symbolTablePutWithAttributes(const Identifier& propertyName, JSValue* value, unsigned attributes)
+    {
+        ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
+
+        SymbolTable::iterator iter = symbolTable().find(propertyName.ustring().rep());
+        if (iter == symbolTable().end())
+            return false;
+        SymbolTableEntry& entry = iter->second;
+        ASSERT(!entry.isNull());
+        entry.setAttributes(attributes);
+        registerAt(entry.getIndex()) = value;
+        return true;
+    }
+
+    inline Register* JSVariableObject::copyRegisterArray(Register* src, size_t count)
+    {
+        Register* registerArray = new Register[count];
+        memcpy(registerArray, src, count * sizeof(Register));
+
+        return registerArray;
+    }
+
+    inline void JSVariableObject::setRegisters(Register* registers, Register* registerArray)
+    {
+        ASSERT(registerArray != d->registerArray.get());
+        d->registerArray.set(registerArray);
+        d->registers = registers;
+    }
+
+} // namespace JSC
+
+#endif // JSVariableObject_h