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diff --git a/Source/JavaScriptCore/b3/B3GenericFrequentedBlock.h b/Source/JavaScriptCore/b3/B3GenericFrequentedBlock.h
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+++ b/Source/JavaScriptCore/b3/B3GenericFrequentedBlock.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)
+
+#include "B3FrequencyClass.h"
+#include <wtf/PrintStream.h>
+
+namespace JSC { namespace B3 {
+
+// A frequented block is a tuple of BasicBlock* and FrequencyClass. It's usually used as a
+// successor edge.
+
+template<typename BasicBlock>
+class GenericFrequentedBlock {
+public:
+    GenericFrequentedBlock(
+        BasicBlock* block = nullptr, FrequencyClass frequency = FrequencyClass::Normal)
+        : m_block(block)
+        , m_frequency(frequency)
+    {
+    }
+
+    bool operator==(const GenericFrequentedBlock& other) const
+    {
+        return m_block == other.m_block
+            && m_frequency == other.m_frequency;
+    }
+
+    bool operator!=(const GenericFrequentedBlock& other) const
+    {
+        return !(*this == other);
+    }
+
+    explicit operator bool() const
+    {
+        return *this != GenericFrequentedBlock();
+    }
+
+    BasicBlock* block() const { return m_block; }
+    BasicBlock*& block() { return m_block; }
+    FrequencyClass frequency() const { return m_frequency; }
+    FrequencyClass& frequency() { return m_frequency; }
+
+    bool isRare() const { return frequency() == FrequencyClass::Rare; }
+
+    void dump(PrintStream& out) const
+    {
+        if (frequency() != FrequencyClass::Normal)
+            out.print(frequency(), ":");
+        out.print(pointerDump(m_block));
+    }
+
+private:
+    BasicBlock* m_block;
+    FrequencyClass m_frequency;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)