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diff --git a/Source/JavaScriptCore/runtime/JSActivation.h b/Source/JavaScriptCore/runtime/JSActivation.h
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+++ b/Source/JavaScriptCore/runtime/JSActivation.h
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+/*
+ * Copyright (C) 2008, 2009 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 JSActivation_h
+#define JSActivation_h
+
+#include "CodeBlock.h"
+#include "JSVariableObject.h"
+#include "SymbolTable.h"
+#include "Nodes.h"
+
+namespace JSC {
+
+    class Arguments;
+    class Register;
+    
+    class JSActivation : public JSVariableObject {
+    private:
+        JSActivation(CallFrame*, FunctionExecutable*);
+    
+    public:
+        typedef JSVariableObject Base;
+
+        static JSActivation* create(JSGlobalData& globalData, CallFrame* callFrame, FunctionExecutable* funcExec)
+        {
+            JSActivation* activation = new (NotNull, allocateCell<JSActivation>(globalData.heap)) JSActivation(callFrame, funcExec);
+            activation->finishCreation(callFrame);
+            return activation;
+        }
+
+        static void finalize(JSCell*);
+
+        static void visitChildren(JSCell*, SlotVisitor&);
+
+        bool isDynamicScope(bool& requiresDynamicChecks) const;
+
+        static bool getOwnPropertySlot(JSCell*, ExecState*, const Identifier&, PropertySlot&);
+        static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
+
+        static void put(JSCell*, ExecState*, const Identifier&, JSValue, PutPropertySlot&);
+
+        static void putWithAttributes(JSObject*, ExecState*, const Identifier&, JSValue, unsigned attributes);
+        static bool deleteProperty(JSCell*, ExecState*, const Identifier& propertyName);
+
+        static JSObject* toThisObject(JSCell*, ExecState*);
+
+        void tearOff(JSGlobalData&);
+        
+        static const ClassInfo s_info;
+
+        static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue proto) { return Structure::create(globalData, globalObject, proto, TypeInfo(ActivationObjectType, StructureFlags), &s_info); }
+
+    protected:
+        void finishCreation(CallFrame*);
+        static const unsigned StructureFlags = IsEnvironmentRecord | OverridesGetOwnPropertySlot | OverridesVisitChildren | OverridesGetPropertyNames | JSVariableObject::StructureFlags;
+
+    private:
+        bool symbolTableGet(const Identifier&, PropertySlot&);
+        bool symbolTableGet(const Identifier&, PropertyDescriptor&);
+        bool symbolTableGet(const Identifier&, PropertySlot&, bool& slotIsWriteable);
+        bool symbolTablePut(ExecState*, const Identifier&, JSValue, bool shouldThrow);
+        bool symbolTablePutWithAttributes(JSGlobalData&, const Identifier&, JSValue, unsigned attributes);
+
+        static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
+        NEVER_INLINE PropertySlot::GetValueFunc getArgumentsGetter();
+
+        int m_numCapturedArgs;
+        int m_numCapturedVars : 31;
+        bool m_requiresDynamicChecks : 1;
+        int m_argumentsRegister;
+    };
+
+    JSActivation* asActivation(JSValue);
+
+    inline JSActivation* asActivation(JSValue value)
+    {
+        ASSERT(asObject(value)->inherits(&JSActivation::s_info));
+        return static_cast<JSActivation*>(asObject(value));
+    }
+    
+    ALWAYS_INLINE JSActivation* Register::activation() const
+    {
+        return asActivation(jsValue());
+    }
+
+    inline bool JSActivation::isDynamicScope(bool& requiresDynamicChecks) const
+    {
+        requiresDynamicChecks = m_requiresDynamicChecks;
+        return false;
+    }
+
+    inline void JSActivation::tearOff(JSGlobalData& globalData)
+    {
+        ASSERT(!m_registerArray);
+        ASSERT(m_numCapturedVars + m_numCapturedArgs);
+
+        int registerOffset = CallFrame::offsetFor(m_numCapturedArgs + 1);
+        size_t registerArraySize = registerOffset + m_numCapturedVars;
+
+        OwnArrayPtr<WriteBarrier<Unknown> > registerArray = adoptArrayPtr(new WriteBarrier<Unknown>[registerArraySize]);
+        WriteBarrier<Unknown>* registers = registerArray.get() + registerOffset;
+
+        // Copy all arguments that can be captured by name or by the arguments object.
+        for (int i = 0; i < m_numCapturedArgs; ++i) {
+            int index = CallFrame::argumentOffset(i);
+            registers[index].set(globalData, this, m_registers[index].get());
+        }
+
+        // Skip 'this' and call frame.
+
+        // Copy all captured vars.
+        for (int i = 0; i < m_numCapturedVars; ++i)
+            registers[i].set(globalData, this, m_registers[i].get());
+
+        setRegisters(registers, registerArray.release());
+    }
+
+} // namespace JSC
+
+#endif // JSActivation_h