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diff --git a/Source/JavaScriptCore/b3/B3FrequencyClass.h b/Source/JavaScriptCore/b3/B3FrequencyClass.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(B3_JIT)
+
+namespace JSC { namespace B3 {
+
+enum class FrequencyClass : uint8_t {
+    // We don't have any hypothesis about the frequency of this control flow construct. This is
+    // the common case. We can still use basic block frequency in this case.
+    Normal,
+
+    // We expect that this control flow construct will be reached super rarely. It's valid to
+    // perform optimizations that punish Rare code. Note that there will be situations where you
+    // have to somehow construct a new frequency class from a merging of multiple classes. When
+    // this happens, never choose Rare; always go with Normal. This is necessary because we
+    // really do punish Rare code very badly.
+    Rare
+};
+
+inline FrequencyClass maxFrequency(FrequencyClass a, FrequencyClass b)
+{
+    if (a == FrequencyClass::Normal)
+        return FrequencyClass::Normal;
+    return b;
+}
+
+} } // namespace JSC::B3
+
+namespace WTF {
+
+class PrintStream;
+
+void printInternal(PrintStream&, JSC::B3::FrequencyClass);
+
+} // namespace WTF
+
+#endif // ENABLE(B3_JIT)