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diff --git a/Source/JavaScriptCore/assembler/RepatchBuffer.h b/Source/JavaScriptCore/assembler/RepatchBuffer.h
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+++ b/Source/JavaScriptCore/assembler/RepatchBuffer.h
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+/*
+ * Copyright (C) 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.
+ *
+ * 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 RepatchBuffer_h
+#define RepatchBuffer_h
+
+#if ENABLE(JIT)
+
+#include "CodeBlock.h"
+#include <MacroAssembler.h>
+#include <wtf/Noncopyable.h>
+
+namespace JSC {
+
+// RepatchBuffer:
+//
+// This class is used to modify code after code generation has been completed,
+// and after the code has potentially already been executed.  This mechanism is
+// used to apply optimizations to the code.
+//
+class RepatchBuffer {
+    typedef MacroAssemblerCodePtr CodePtr;
+
+public:
+    RepatchBuffer(CodeBlock* codeBlock)
+        : m_codeBlock(codeBlock)
+    {
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+        RefPtr<JITCode> code = codeBlock->jitCode();
+        m_start = code->start();
+        m_size = code->size();
+
+        ExecutableAllocator::makeWritable(m_start, m_size);
+#endif
+    }
+
+    ~RepatchBuffer()
+    {
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+        ExecutableAllocator::makeExecutable(m_start, m_size);
+#endif
+    }
+    
+    CodeBlock* codeBlock() const { return m_codeBlock; }
+
+    void relink(CodeLocationJump jump, CodeLocationLabel destination)
+    {
+        MacroAssembler::repatchJump(jump, destination);
+    }
+
+    void relink(CodeLocationCall call, CodeLocationLabel destination)
+    {
+        MacroAssembler::repatchCall(call, destination);
+    }
+
+    void relink(CodeLocationCall call, FunctionPtr destination)
+    {
+        MacroAssembler::repatchCall(call, destination);
+    }
+
+    void relink(CodeLocationNearCall nearCall, CodePtr destination)
+    {
+        MacroAssembler::repatchNearCall(nearCall, CodeLocationLabel(destination));
+    }
+
+    void relink(CodeLocationNearCall nearCall, CodeLocationLabel destination)
+    {
+        MacroAssembler::repatchNearCall(nearCall, destination);
+    }
+
+    void repatch(CodeLocationDataLabel32 dataLabel32, int32_t value)
+    {
+        MacroAssembler::repatchInt32(dataLabel32, value);
+    }
+
+    void repatch(CodeLocationDataLabelCompact dataLabelCompact, int32_t value)
+    {
+        MacroAssembler::repatchCompact(dataLabelCompact, value);
+    }
+
+    void repatch(CodeLocationDataLabelPtr dataLabelPtr, void* value)
+    {
+        MacroAssembler::repatchPointer(dataLabelPtr, value);
+    }
+
+    void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label)
+    {
+        relink(CodeLocationCall(CodePtr(returnAddress)), label);
+    }
+    
+    void relinkCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction)
+    {
+        relinkCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction));
+    }
+
+    void relinkCallerToFunction(ReturnAddressPtr returnAddress, FunctionPtr function)
+    {
+        relink(CodeLocationCall(CodePtr(returnAddress)), function);
+    }
+    
+    void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodeLocationLabel label)
+    {
+        relink(CodeLocationNearCall(CodePtr(returnAddress)), label);
+    }
+    
+    void relinkNearCallerToTrampoline(ReturnAddressPtr returnAddress, CodePtr newCalleeFunction)
+    {
+        relinkNearCallerToTrampoline(returnAddress, CodeLocationLabel(newCalleeFunction));
+    }
+    
+    void replaceWithLoad(CodeLocationConvertibleLoad label)
+    {
+        MacroAssembler::replaceWithLoad(label);
+    }
+    
+    void replaceWithAddressComputation(CodeLocationConvertibleLoad label)
+    {
+        MacroAssembler::replaceWithAddressComputation(label);
+    }
+    
+    void setLoadInstructionIsActive(CodeLocationConvertibleLoad label, bool isActive)
+    {
+        if (isActive)
+            replaceWithLoad(label);
+        else
+            replaceWithAddressComputation(label);
+    }
+
+    static CodeLocationLabel startOfBranchPtrWithPatchOnRegister(CodeLocationDataLabelPtr label)
+    {
+        return MacroAssembler::startOfBranchPtrWithPatchOnRegister(label);
+    }
+    
+    static CodeLocationLabel startOfPatchableBranchPtrWithPatchOnAddress(CodeLocationDataLabelPtr label)
+    {
+        return MacroAssembler::startOfPatchableBranchPtrWithPatchOnAddress(label);
+    }
+
+    static CodeLocationLabel startOfPatchableBranch32WithPatchOnAddress(CodeLocationDataLabel32 label)
+    {
+        return MacroAssembler::startOfPatchableBranch32WithPatchOnAddress(label);
+    }
+    
+    void replaceWithJump(CodeLocationLabel instructionStart, CodeLocationLabel destination)
+    {
+        MacroAssembler::replaceWithJump(instructionStart, destination);
+    }
+    
+    // This is a *bit* of a silly API, since we currently always also repatch the
+    // immediate after calling this. But I'm fine with that, since this just feels
+    // less yucky.
+    void revertJumpReplacementToBranchPtrWithPatch(CodeLocationLabel instructionStart, MacroAssembler::RegisterID reg, void* value)
+    {
+        MacroAssembler::revertJumpReplacementToBranchPtrWithPatch(instructionStart, reg, value);
+    }
+
+    void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel instructionStart, MacroAssembler::Address address, void* value)
+    {
+        MacroAssembler::revertJumpReplacementToPatchableBranchPtrWithPatch(instructionStart, address, value);
+    }
+
+    void revertJumpReplacementToPatchableBranch32WithPatch(CodeLocationLabel instructionStart, MacroAssembler::Address address, int32_t value)
+    {
+        MacroAssembler::revertJumpReplacementToPatchableBranch32WithPatch(instructionStart, address, value);
+    }
+
+private:
+    CodeBlock* m_codeBlock;
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+    void* m_start;
+    size_t m_size;
+#endif
+};
+
+} // namespace JSC
+
+#endif // ENABLE(ASSEMBLER)
+
+#endif // RepatchBuffer_h