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diff --git a/Source/JavaScriptCore/bytecompiler/StaticPropertyAnalysis.h b/Source/JavaScriptCore/bytecompiler/StaticPropertyAnalysis.h
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+++ b/Source/JavaScriptCore/bytecompiler/StaticPropertyAnalysis.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 StaticPropertyAnalysis_h
+#define StaticPropertyAnalysis_h
+
+#include "Executable.h"
+#include "JSGlobalObject.h"
+#include <wtf/HashSet.h>
+
+namespace JSC {
+
+// Reference count indicates number of live registers that alias this object.
+class StaticPropertyAnalysis : public RefCounted<StaticPropertyAnalysis> {
+public:
+    static PassRefPtr<StaticPropertyAnalysis> create(Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* instructions, unsigned target)
+    {
+        return adoptRef(new StaticPropertyAnalysis(instructions, target)); 
+    }
+
+    void addPropertyIndex(unsigned propertyIndex) { m_propertyIndexes.add(propertyIndex); }
+
+    void record()
+    {
+        (*m_instructions)[m_target] = m_propertyIndexes.size();
+    }
+
+    int propertyIndexCount() { return m_propertyIndexes.size(); }
+
+private:
+    StaticPropertyAnalysis(Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* instructions, unsigned target)
+        : m_instructions(instructions)
+        , m_target(target)
+    {
+    }
+
+    Vector<UnlinkedInstruction, 0, UnsafeVectorOverflow>* m_instructions;
+    unsigned m_target;
+    typedef HashSet<unsigned, WTF::IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned> > PropertyIndexSet;
+    PropertyIndexSet m_propertyIndexes;
+};
+
+} // namespace JSC
+
+#endif // StaticPropertyAnalysis_h