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diff --git a/Source/JavaScriptCore/jit/JITThunks.cpp b/Source/JavaScriptCore/jit/JITThunks.cpp
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+++ b/Source/JavaScriptCore/jit/JITThunks.cpp
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+/*
+ * Copyright (C) 2012 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. 
+ */
+
+#include "config.h"
+#include "JITThunks.h"
+
+#if ENABLE(JIT)
+
+#include "Executable.h"
+#include "JIT.h"
+#include "VM.h"
+#include "Operations.h"
+
+namespace JSC {
+
+JITThunks::JITThunks()
+    : m_hostFunctionStubMap(adoptPtr(new HostFunctionStubMap))
+{
+}
+
+JITThunks::~JITThunks()
+{
+}
+
+MacroAssemblerCodePtr JITThunks::ctiNativeCall(VM* vm)
+{
+#if ENABLE(LLINT)
+    if (!vm->canUseJIT())
+        return MacroAssemblerCodePtr::createLLIntCodePtr(llint_native_call_trampoline);
+#endif
+    return ctiStub(vm, nativeCallGenerator).code();
+}
+MacroAssemblerCodePtr JITThunks::ctiNativeConstruct(VM* vm)
+{
+#if ENABLE(LLINT)
+    if (!vm->canUseJIT())
+        return MacroAssemblerCodePtr::createLLIntCodePtr(llint_native_construct_trampoline);
+#endif
+    return ctiStub(vm, nativeConstructGenerator).code();
+}
+
+MacroAssemblerCodeRef JITThunks::ctiStub(VM* vm, ThunkGenerator generator)
+{
+    CTIStubMap::AddResult entry = m_ctiStubMap.add(generator, MacroAssemblerCodeRef());
+    if (entry.isNewEntry)
+        entry.iterator->value = generator(vm);
+    return entry.iterator->value;
+}
+
+NativeExecutable* JITThunks::hostFunctionStub(VM* vm, NativeFunction function, NativeFunction constructor)
+{
+    if (NativeExecutable* nativeExecutable = m_hostFunctionStubMap->get(std::make_pair(function, constructor)))
+        return nativeExecutable;
+
+    NativeExecutable* nativeExecutable = NativeExecutable::create(*vm, JIT::compileCTINativeCall(vm, function), function, MacroAssemblerCodeRef::createSelfManagedCodeRef(ctiNativeConstruct(vm)), constructor, NoIntrinsic);
+    weakAdd(*m_hostFunctionStubMap, std::make_pair(function, constructor), PassWeak<NativeExecutable>(nativeExecutable));
+    return nativeExecutable;
+}
+
+NativeExecutable* JITThunks::hostFunctionStub(VM* vm, NativeFunction function, ThunkGenerator generator, Intrinsic intrinsic)
+{
+    if (NativeExecutable* nativeExecutable = m_hostFunctionStubMap->get(std::make_pair(function, &callHostFunctionAsConstructor)))
+        return nativeExecutable;
+
+    MacroAssemblerCodeRef code;
+    if (generator) {
+        if (vm->canUseJIT())
+            code = generator(vm);
+        else
+            code = MacroAssemblerCodeRef();
+    } else
+        code = JIT::compileCTINativeCall(vm, function);
+
+    NativeExecutable* nativeExecutable = NativeExecutable::create(*vm, code, function, MacroAssemblerCodeRef::createSelfManagedCodeRef(ctiNativeConstruct(vm)), callHostFunctionAsConstructor, intrinsic);
+    weakAdd(*m_hostFunctionStubMap, std::make_pair(function, &callHostFunctionAsConstructor), PassWeak<NativeExecutable>(nativeExecutable));
+    return nativeExecutable;
+}
+
+void JITThunks::clearHostFunctionStubs()
+{
+    m_hostFunctionStubMap.clear();
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)