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diff --git a/Source/JavaScriptCore/jit/JITCode.h b/Source/JavaScriptCore/jit/JITCode.h
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+++ b/Source/JavaScriptCore/jit/JITCode.h
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+/*
+ * Copyright (C) 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.
+ *
+ * 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. 
+ */
+
+#ifndef JITCode_h
+#define JITCode_h
+
+#if ENABLE(JIT)
+#include "CallFrame.h"
+#include "JSValue.h"
+#include "MacroAssemblerCodeRef.h"
+#include "Profiler.h"
+#endif
+
+namespace JSC {
+
+#if ENABLE(JIT)
+    class JSGlobalData;
+    class RegisterFile;
+#endif
+    
+    class JITCode {
+#if ENABLE(JIT)
+        typedef MacroAssemblerCodeRef CodeRef;
+        typedef MacroAssemblerCodePtr CodePtr;
+#else
+        JITCode() { }
+#endif
+    public:
+        enum JITType { HostCallThunk, BaselineJIT, DFGJIT };
+        
+        static JITType bottomTierJIT()
+        {
+            return BaselineJIT;
+        }
+        
+        static JITType topTierJIT()
+        {
+            return DFGJIT;
+        }
+        
+        static JITType nextTierJIT(JITType jitType)
+        {
+            ASSERT_UNUSED(jitType, jitType == BaselineJIT || jitType == DFGJIT);
+            return DFGJIT;
+        }
+        
+#if ENABLE(JIT)
+        JITCode()
+        {
+        }
+
+        JITCode(const CodeRef ref, JITType jitType)
+            : m_ref(ref)
+            , m_jitType(jitType)
+        {
+        }
+        
+        bool operator !() const
+        {
+            return !m_ref;
+        }
+
+        CodePtr addressForCall()
+        {
+            return m_ref.code();
+        }
+
+        void* executableAddressAtOffset(size_t offset) const
+        {
+            ASSERT(offset < size());
+            return reinterpret_cast<char*>(m_ref.code().executableAddress()) + offset;
+        }
+        
+        void* dataAddressAtOffset(size_t offset) const
+        {
+            ASSERT(offset < size());
+            return reinterpret_cast<char*>(m_ref.code().dataLocation()) + offset;
+        }
+
+        // This function returns the offset in bytes of 'pointerIntoCode' into
+        // this block of code.  The pointer provided must be a pointer into this
+        // block of code.  It is ASSERTed that no codeblock >4gb in size.
+        unsigned offsetOf(void* pointerIntoCode)
+        {
+            intptr_t result = reinterpret_cast<intptr_t>(pointerIntoCode) - reinterpret_cast<intptr_t>(m_ref.code().executableAddress());
+            ASSERT(static_cast<intptr_t>(static_cast<unsigned>(result)) == result);
+            return static_cast<unsigned>(result);
+        }
+
+        // Execute the code!
+        inline JSValue execute(RegisterFile* registerFile, CallFrame* callFrame, JSGlobalData* globalData)
+        {
+            JSValue result = JSValue::decode(ctiTrampoline(m_ref.code().executableAddress(), registerFile, callFrame, 0, Profiler::enabledProfilerReference(), globalData));
+            return globalData->exception ? jsNull() : result;
+        }
+
+        void* start() const
+        {
+            return m_ref.code().dataLocation();
+        }
+
+        size_t size() const
+        {
+            ASSERT(m_ref.code().executableAddress());
+            return m_ref.size();
+        }
+
+        ExecutableMemoryHandle* getExecutableMemory()
+        {
+            return m_ref.executableMemory();
+        }
+        
+        JITType jitType()
+        {
+            return m_jitType;
+        }
+
+        // Host functions are a bit special; they have a m_code pointer but they
+        // do not individully ref the executable pool containing the trampoline.
+        static JITCode HostFunction(CodeRef code)
+        {
+            return JITCode(code, HostCallThunk);
+        }
+
+        void clear()
+        {
+            m_ref.~CodeRef();
+            new (NotNull, &m_ref) CodeRef();
+        }
+
+    private:
+        JITCode(PassRefPtr<ExecutableMemoryHandle> executableMemory, JITType jitType)
+            : m_ref(executableMemory)
+            , m_jitType(jitType)
+        {
+        }
+
+        CodeRef m_ref;
+        JITType m_jitType;
+#endif // ENABLE(JIT)
+    };
+
+};
+
+#endif