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diff --git a/Source/JavaScriptCore/ftl/FTLWeight.h b/Source/JavaScriptCore/ftl/FTLWeight.h
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+++ b/Source/JavaScriptCore/ftl/FTLWeight.h
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+/*
+ * Copyright (C) 2014 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 FTLWeight_h
+#define FTLWeight_h
+
+#if ENABLE(FTL_JIT)
+
+#include "B3FrequencyClass.h"
+#include <wtf/MathExtras.h>
+#include <wtf/StdLibExtras.h>
+
+namespace JSC { namespace FTL {
+
+class Weight {
+public:
+    Weight()
+        : m_value(std::numeric_limits<float>::quiet_NaN())
+    {
+    }
+    
+    explicit Weight(float value)
+        : m_value(value)
+    {
+    }
+    
+    bool isSet() const { return m_value == m_value; }
+    bool operator!() const { return !isSet(); }
+    
+    float value() const { return m_value; }
+
+    B3::FrequencyClass frequencyClass() const { return value() ? B3::FrequencyClass::Normal : B3::FrequencyClass::Rare; }
+    
+    // Inverse weight for a two-target branch.
+    Weight inverse() const
+    {
+        if (!isSet())
+            return Weight();
+        if (value())
+            return Weight(0);
+        return Weight(1);
+    }
+    
+private:
+    float m_value;
+};
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+
+#endif // FTLWeight_h
+