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diff --git a/Source/JavaScriptCore/bytecode/StructureSet.h b/Source/JavaScriptCore/bytecode/StructureSet.h
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+/*
+ * Copyright (C) 2011 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 StructureSet_h
+#define StructureSet_h
+
+#include "PredictedType.h"
+#include <stdio.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class Structure;
+
+namespace DFG {
+class StructureAbstractValue;
+}
+
+class StructureSet {
+public:
+    StructureSet() { }
+    
+    StructureSet(Structure* structure)
+    {
+        m_structures.append(structure);
+    }
+    
+    void clear()
+    {
+        m_structures.clear();
+    }
+    
+    void add(Structure* structure)
+    {
+        ASSERT(!contains(structure));
+        m_structures.append(structure);
+    }
+    
+    bool addAll(const StructureSet& other)
+    {
+        bool changed = false;
+        for (size_t i = 0; i < other.size(); ++i) {
+            if (contains(other[i]))
+                continue;
+            add(other[i]);
+            changed = true;
+        }
+        return changed;
+    }
+    
+    void remove(Structure* structure)
+    {
+        for (size_t i = 0; i < m_structures.size(); ++i) {
+            if (m_structures[i] != structure)
+                continue;
+            
+            m_structures[i] = m_structures.last();
+            m_structures.removeLast();
+            return;
+        }
+    }
+    
+    bool contains(Structure* structure) const
+    {
+        for (size_t i = 0; i < m_structures.size(); ++i) {
+            if (m_structures[i] == structure)
+                return true;
+        }
+        return false;
+    }
+    
+    bool isSubsetOf(const StructureSet& other) const
+    {
+        for (size_t i = 0; i < m_structures.size(); ++i) {
+            if (!other.contains(m_structures[i]))
+                return false;
+        }
+        return true;
+    }
+    
+    bool isSupersetOf(const StructureSet& other) const
+    {
+        return other.isSubsetOf(*this);
+    }
+    
+    size_t size() const { return m_structures.size(); }
+    
+    Structure* at(size_t i) const { return m_structures.at(i); }
+    
+    Structure* operator[](size_t i) const { return at(i); }
+    
+    Structure* last() const { return m_structures.last(); }
+
+    PredictedType predictionFromStructures() const
+    {
+        PredictedType result = PredictNone;
+        
+        for (size_t i = 0; i < m_structures.size(); ++i)
+            mergePrediction(result, predictionFromStructure(m_structures[i]));
+        
+        return result;
+    }
+    
+    bool operator==(const StructureSet& other) const
+    {
+        if (m_structures.size() != other.m_structures.size())
+            return false;
+        
+        for (size_t i = 0; i < m_structures.size(); ++i) {
+            if (!other.contains(m_structures[i]))
+                return false;
+        }
+        
+        return true;
+    }
+    
+    void dump(FILE* out)
+    {
+        fprintf(out, "[");
+        for (size_t i = 0; i < m_structures.size(); ++i) {
+            if (i)
+                fprintf(out, ", ");
+            fprintf(out, "%p", m_structures[i]);
+        }
+        fprintf(out, "]");
+    }
+    
+private:
+    friend class DFG::StructureAbstractValue;
+    
+    Vector<Structure*, 2> m_structures;
+};
+
+} // namespace JSC
+
+#endif // StructureSet_h