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diff --git a/Source/JavaScriptCore/runtime/FunctionHasExecutedCache.h b/Source/JavaScriptCore/runtime/FunctionHasExecutedCache.h
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+++ b/Source/JavaScriptCore/runtime/FunctionHasExecutedCache.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 FunctionHasExecutedCache_h
+#define FunctionHasExecutedCache_h
+
+#include <unordered_map>
+#include <wtf/HashMethod.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class FunctionHasExecutedCache {
+public:
+    struct FunctionRange {
+        FunctionRange() {}
+        bool operator==(const FunctionRange& other) const 
+        {
+            return m_start == other.m_start && m_end == other.m_end;
+        }
+        unsigned hash() const
+        {
+            return m_start * m_end;
+        }
+
+        unsigned m_start;
+        unsigned m_end;
+    };
+
+    bool hasExecutedAtOffset(intptr_t id, unsigned offset);
+    void insertUnexecutedRange(intptr_t id, unsigned start, unsigned end);
+    void removeUnexecutedRange(intptr_t id, unsigned start, unsigned end);
+    Vector<std::tuple<bool, unsigned, unsigned>> getFunctionRanges(intptr_t id);
+
+private:     
+    typedef std::unordered_map<FunctionRange, bool, HashMethod<FunctionRange>> RangeMap;
+    typedef std::unordered_map<intptr_t, RangeMap> SourceIDToRangeMap;
+    SourceIDToRangeMap m_rangeMap;
+};
+
+} // namespace JSC
+
+#endif // FunctionHasExecutedCache_h