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diff --git a/Source/JavaScriptCore/runtime/JSFunction.h b/Source/JavaScriptCore/runtime/JSFunction.h
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+/*
+ *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
+ *  Copyright (C) 2007 Maks Orlovich
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef JSFunction_h
+#define JSFunction_h
+
+#include "JSObject.h"
+
+namespace JSC {
+
+    class ExecutableBase;
+    class FunctionExecutable;
+    class FunctionPrototype;
+    class JSActivation;
+    class JSGlobalObject;
+    class NativeExecutable;
+    class SourceCode;
+    namespace DFG {
+    class SpeculativeJIT;
+    class JITCompiler;
+    }
+
+    EncodedJSValue JSC_HOST_CALL callHostFunctionAsConstructor(ExecState*);
+
+    class JSFunction : public JSNonFinalObject {
+        friend class JIT;
+        friend class DFG::SpeculativeJIT;
+        friend class DFG::JITCompiler;
+        friend class JSGlobalData;
+
+    public:
+        typedef JSNonFinalObject Base;
+
+        static JSFunction* create(ExecState*, JSGlobalObject*, int length, const Identifier& name, NativeFunction nativeFunction, NativeFunction nativeConstructor = callHostFunctionAsConstructor);
+        static JSFunction* create(ExecState*, JSGlobalObject*, int length, const Identifier& name, NativeExecutable* nativeExecutable);
+
+        static JSFunction* create(ExecState* exec, FunctionExecutable* executable, ScopeChainNode* scopeChain)
+        {
+            JSFunction* function = new (NotNull, allocateCell<JSFunction>(*exec->heap())) JSFunction(exec, executable, scopeChain);
+            ASSERT(function->structure()->globalObject());
+            function->finishCreation(exec, executable, scopeChain);
+            return function;
+        }
+        
+        static void destroy(JSCell*);
+
+        const UString& name(ExecState*);
+        const UString displayName(ExecState*);
+        const UString calculatedDisplayName(ExecState*);
+
+        ScopeChainNode* scope()
+        {
+            ASSERT(!isHostFunctionNonInline());
+            return m_scopeChain.get();
+        }
+        // This method may be called for host functins, in which case it
+        // will return an arbitrary value. This should only be used for
+        // optimized paths in which the return value does not matter for
+        // host functions, and checking whether the function is a host
+        // function is deemed too expensive.
+        ScopeChainNode* scopeUnchecked()
+        {
+            return m_scopeChain.get();
+        }
+        void setScope(JSGlobalData& globalData, ScopeChainNode* scopeChain)
+        {
+            ASSERT(!isHostFunctionNonInline());
+            m_scopeChain.set(globalData, this, scopeChain);
+        }
+
+        ExecutableBase* executable() const { return m_executable.get(); }
+
+        // To call either of these methods include Executable.h
+        inline bool isHostFunction() const;
+        FunctionExecutable* jsExecutable() const;
+
+        const SourceCode* sourceCode() const;
+
+        static JS_EXPORTDATA const ClassInfo s_info;
+
+        static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype) 
+        {
+            ASSERT(globalObject);
+            return Structure::create(globalData, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), &s_info); 
+        }
+
+        NativeFunction nativeFunction();
+        NativeFunction nativeConstructor();
+
+        static ConstructType getConstructData(JSCell*, ConstructData&);
+        static CallType getCallData(JSCell*, CallData&);
+
+        static inline size_t offsetOfScopeChain()
+        {
+            return OBJECT_OFFSETOF(JSFunction, m_scopeChain);
+        }
+
+        static inline size_t offsetOfExecutable()
+        {
+            return OBJECT_OFFSETOF(JSFunction, m_executable);
+        }
+
+    protected:
+        const static unsigned StructureFlags = OverridesGetOwnPropertySlot | ImplementsHasInstance | OverridesVisitChildren | OverridesGetPropertyNames | JSObject::StructureFlags;
+
+        JSFunction(ExecState*, JSGlobalObject*, Structure*);
+        JSFunction(ExecState*, FunctionExecutable*, ScopeChainNode*);
+        
+        void finishCreation(ExecState*, NativeExecutable*, int length, const Identifier& name);
+        void finishCreation(ExecState*, FunctionExecutable*, ScopeChainNode*);
+
+        static bool getOwnPropertySlot(JSCell*, ExecState*, const Identifier&, PropertySlot&);
+        static bool getOwnPropertyDescriptor(JSObject*, ExecState*, const Identifier&, PropertyDescriptor&);
+        static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode = ExcludeDontEnumProperties);
+
+        static void put(JSCell*, ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
+
+        static bool deleteProperty(JSCell*, ExecState*, const Identifier& propertyName);
+
+        static void visitChildren(JSCell*, SlotVisitor&);
+
+    private:
+        bool isHostFunctionNonInline() const;
+
+        static JSValue argumentsGetter(ExecState*, JSValue, const Identifier&);
+        static JSValue callerGetter(ExecState*, JSValue, const Identifier&);
+        static JSValue lengthGetter(ExecState*, JSValue, const Identifier&);
+
+        WriteBarrier<ExecutableBase> m_executable;
+        WriteBarrier<ScopeChainNode> m_scopeChain;
+    };
+
+    JSFunction* asFunction(JSValue);
+
+    inline JSFunction* asFunction(JSValue value)
+    {
+        ASSERT(asObject(value)->inherits(&JSFunction::s_info));
+        return static_cast<JSFunction*>(asObject(value));
+    }
+
+} // namespace JSC
+
+#endif // JSFunction_h