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diff --git a/Source/JavaScriptCore/dfg/DFGOSRExitBase.h b/Source/JavaScriptCore/dfg/DFGOSRExitBase.h
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+++ b/Source/JavaScriptCore/dfg/DFGOSRExitBase.h
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+/*
+ * Copyright (C) 2013, 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. 
+ */
+
+#ifndef DFGOSRExitBase_h
+#define DFGOSRExitBase_h
+
+#if ENABLE(DFG_JIT)
+
+#include "CodeOrigin.h"
+#include "DFGExitProfile.h"
+
+namespace JSC { namespace DFG {
+
+struct BasicBlock;
+struct Node;
+
+// Provides for the OSR exit profiling functionality that is common between the DFG
+// and the FTL.
+
+struct OSRExitBase {
+    OSRExitBase(ExitKind kind, CodeOrigin origin, CodeOrigin originForProfile)
+        : m_kind(kind)
+        , m_count(0)
+        , m_codeOrigin(origin)
+        , m_codeOriginForExitProfile(originForProfile)
+    {
+        ASSERT(m_codeOrigin.isSet());
+        ASSERT(m_codeOriginForExitProfile.isSet());
+    }
+    
+    ExitKind m_kind;
+    uint32_t m_count;
+    
+    CodeOrigin m_codeOrigin;
+    CodeOrigin m_codeOriginForExitProfile;
+    CallSiteIndex m_exceptionHandlerCallSiteIndex;
+
+    ALWAYS_INLINE bool isExceptionHandler() const
+    {
+        return m_kind == ExceptionCheck || m_kind == GenericUnwind;
+    }
+
+    // True if this exit is used as an exception handler for unwinding. This happens to only be set when
+    // isExceptionHandler is true, but all this actually means is that the OSR exit will assume that the
+    // machine state is as it would be coming out of genericUnwind.
+    ALWAYS_INLINE bool isGenericUnwindHandler() const
+    {
+        return m_kind == GenericUnwind;
+    }
+
+protected:
+    void considerAddingAsFrequentExitSite(CodeBlock* profiledCodeBlock, ExitingJITType jitType)
+    {
+        if (m_count)
+            considerAddingAsFrequentExitSiteSlow(profiledCodeBlock, jitType);
+    }
+
+private:
+    void considerAddingAsFrequentExitSiteSlow(CodeBlock* profiledCodeBlock, ExitingJITType);
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGOSRExitBase_h
+