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diff --git a/Source/JavaScriptCore/ftl/FTLLazySlowPath.h b/Source/JavaScriptCore/ftl/FTLLazySlowPath.h
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+++ b/Source/JavaScriptCore/ftl/FTLLazySlowPath.h
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+/*
+ * Copyright (C) 2015 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. 
+ */
+
+#pragma once
+
+#if ENABLE(FTL_JIT)
+
+#include "CCallHelpers.h"
+#include "CodeBlock.h"
+#include "CodeLocation.h"
+#include "GPRInfo.h"
+#include "MacroAssemblerCodeRef.h"
+#include "RegisterSet.h"
+#include "ScratchRegisterAllocator.h"
+#include <wtf/SharedTask.h>
+
+namespace JSC { namespace FTL {
+
+// A LazySlowPath is an object that represents a piece of code that is part of FTL generated code
+// that will be generated lazily. It holds all of the important information needed to generate that
+// code, such as where to link jumps to and which registers are in use. It also has a reference to a
+// SharedTask that will do the actual code generation. That SharedTask may have additional data, like
+// which registers hold the inputs or outputs.
+class LazySlowPath {
+    WTF_MAKE_NONCOPYABLE(LazySlowPath);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    struct GenerationParams {
+        // Extra parameters to the GeneratorFunction are made into fields of this struct, so that if
+        // we add new parameters, we don't have to change all of the users.
+        CCallHelpers::JumpList doneJumps;
+        CCallHelpers::JumpList* exceptionJumps;
+        LazySlowPath* lazySlowPath;
+    };
+
+    typedef void GeneratorFunction(CCallHelpers&, GenerationParams&);
+    typedef SharedTask<GeneratorFunction> Generator;
+
+    template<typename Functor>
+    static RefPtr<Generator> createGenerator(const Functor& functor)
+    {
+        return createSharedTask<GeneratorFunction>(functor);
+    }
+    
+    LazySlowPath(
+        CodeLocationJump patchableJump, CodeLocationLabel done,
+        CodeLocationLabel exceptionTarget, const RegisterSet& usedRegisters,
+        CallSiteIndex, RefPtr<Generator>
+        );
+
+    ~LazySlowPath();
+
+    CodeLocationJump patchableJump() const { return m_patchableJump; }
+    CodeLocationLabel done() const { return m_done; }
+    const RegisterSet& usedRegisters() const { return m_usedRegisters; }
+    CallSiteIndex callSiteIndex() const { return m_callSiteIndex; }
+
+    void generate(CodeBlock*);
+
+    MacroAssemblerCodeRef stub() const { return m_stub; }
+
+private:
+    CodeLocationJump m_patchableJump;
+    CodeLocationLabel m_done;
+    CodeLocationLabel m_exceptionTarget;
+    RegisterSet m_usedRegisters;
+    CallSiteIndex m_callSiteIndex;
+    MacroAssemblerCodeRef m_stub;
+    RefPtr<Generator> m_generator;
+};
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)