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diff --git a/Source/JavaScriptCore/dfg/DFGFlushedAt.h b/Source/JavaScriptCore/dfg/DFGFlushedAt.h
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+++ b/Source/JavaScriptCore/dfg/DFGFlushedAt.h
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+/*
+ * Copyright (C) 2013 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 DFGFlushedAt_h
+#define DFGFlushedAt_h
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGFlushFormat.h"
+#include "VirtualRegister.h"
+
+namespace JSC { namespace DFG {
+
+class FlushedAt {
+public:
+    FlushedAt()
+        : m_format(DeadFlush)
+    {
+    }
+    
+    explicit FlushedAt(FlushFormat format)
+        : m_format(format)
+    {
+        ASSERT(format == DeadFlush || format == ConflictingFlush);
+    }
+    
+    FlushedAt(FlushFormat format, VirtualRegister virtualRegister)
+        : m_format(format)
+        , m_virtualRegister(virtualRegister)
+    {
+        if (format == DeadFlush)
+            ASSERT(!virtualRegister.isValid());
+    }
+    
+    bool operator!() const { return m_format == DeadFlush; }
+    
+    FlushFormat format() const { return m_format; }
+    VirtualRegister virtualRegister() const { return m_virtualRegister; }
+    
+    bool operator==(const FlushedAt& other) const
+    {
+        return m_format == other.m_format
+            && m_virtualRegister == other.m_virtualRegister;
+    }
+    
+    bool operator!=(const FlushedAt& other) const { return !(*this == other); }
+    
+    FlushedAt merge(const FlushedAt& other) const
+    {
+        if (!*this)
+            return other;
+        if (!other)
+            return *this;
+        if (*this == other)
+            return *this;
+        return FlushedAt(ConflictingFlush);
+    }
+    
+    void dump(PrintStream&) const;
+    void dumpInContext(PrintStream&, DumpContext*) const;
+    
+private:
+    FlushFormat m_format;
+    VirtualRegister m_virtualRegister;
+};
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGFlushedAt_h
+