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diff --git a/Source/JavaScriptCore/ftl/FTLOSRExitHandle.h b/Source/JavaScriptCore/ftl/FTLOSRExitHandle.h
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+++ b/Source/JavaScriptCore/ftl/FTLOSRExitHandle.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
+
+#include "DFGCommon.h"
+
+#if ENABLE(FTL_JIT)
+
+#include "CCallHelpers.h"
+#include <wtf/ThreadSafeRefCounted.h>
+
+namespace JSC { namespace FTL {
+
+class State;
+struct OSRExit;
+
+// This is an object that stores some interesting data about an OSR exit. It's expected that you will
+// scrape this data from this object by the time compilation finishes.
+struct OSRExitHandle : public ThreadSafeRefCounted<OSRExitHandle> {
+    OSRExitHandle(unsigned index, OSRExit& exit)
+        : index(index)
+        , exit(exit)
+    {
+    }
+
+    unsigned index;
+    OSRExit& exit;
+
+    // This is the label at which the OSR exit jump lives. This will get populated once the OSR exit
+    // emits its jump. This happens immediately when you call OSRExit::appendOSRExit(). It happens at
+    // some time during late path emission if you do OSRExit::appendOSRExitLater().
+    CCallHelpers::Label label;
+
+    // This emits the exit thunk and populates 'label'.
+    void emitExitThunk(State&, CCallHelpers&);
+};
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)