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diff --git a/JavaScriptCore/runtime/PropertyNameArray.h b/JavaScriptCore/runtime/PropertyNameArray.h
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+++ b/JavaScriptCore/runtime/PropertyNameArray.h
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+/*
+ *  Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef PropertyNameArray_h
+#define PropertyNameArray_h
+
+#include "ExecState.h"
+#include "StructureID.h"
+#include "identifier.h"
+#include <wtf/HashSet.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+    class PropertyNameArrayData : public RefCounted<PropertyNameArrayData> {
+    public:
+        typedef Vector<Identifier, 20> PropertyNameVector;
+        typedef PropertyNameVector::const_iterator const_iterator;
+
+        static PassRefPtr<PropertyNameArrayData> create() { return adoptRef(new PropertyNameArrayData); }
+
+        const_iterator begin() const { return m_propertyNameVector.begin(); }
+        const_iterator end() const { return m_propertyNameVector.end(); }
+
+        PropertyNameVector& propertyNameVector() { return m_propertyNameVector; }
+
+        void setCachedStructureID(StructureID* structureID) { m_cachedStructureID = structureID; }
+        StructureID* cachedStructureID() const { return m_cachedStructureID; }
+
+        void setCachedPrototypeChain(PassRefPtr<StructureIDChain> cachedPrototypeChain) { m_cachedPrototypeChain = cachedPrototypeChain; }
+        StructureIDChain* cachedPrototypeChain() { return m_cachedPrototypeChain.get(); }
+
+    private:
+        PropertyNameArrayData()
+            : m_cachedStructureID(0)
+        {
+        }
+
+        PropertyNameVector m_propertyNameVector;
+        StructureID* m_cachedStructureID;
+        RefPtr<StructureIDChain> m_cachedPrototypeChain;
+    };
+
+    class PropertyNameArray {
+    public:
+        typedef PropertyNameArrayData::const_iterator const_iterator;
+
+        PropertyNameArray(JSGlobalData* globalData)
+            : m_data(PropertyNameArrayData::create())
+            , m_globalData(globalData)
+            , m_cacheable(true)
+        {
+        }
+
+        PropertyNameArray(ExecState* exec)
+            : m_data(PropertyNameArrayData::create())
+            , m_globalData(&exec->globalData())
+            , m_cacheable(true)
+        {
+        }
+
+        JSGlobalData* globalData() { return m_globalData; }
+
+        void add(const Identifier& identifier) { add(identifier.ustring().rep()); }
+        void add(UString::Rep*);
+        void addKnownUnique(UString::Rep* identifier) { m_data->propertyNameVector().append(Identifier(m_globalData, identifier)); }
+
+        size_t size() const { return m_data->propertyNameVector().size(); }
+
+        Identifier& operator[](unsigned i) { return m_data->propertyNameVector()[i]; }
+        const Identifier& operator[](unsigned i) const { return m_data->propertyNameVector()[i]; }
+
+        const_iterator begin() const { return m_data->begin(); }
+        const_iterator end() const { return m_data->end(); }
+
+        void setData(PassRefPtr<PropertyNameArrayData> data) { m_data = data; }
+        PropertyNameArrayData* data() { return m_data.get(); }
+
+        PassRefPtr<PropertyNameArrayData> releaseData() { return m_data.release(); }
+
+        void setCacheable(bool cacheable) { m_cacheable = cacheable; }
+        bool cacheable() const { return m_cacheable; }
+
+    private:
+        typedef HashSet<UString::Rep*, PtrHash<UString::Rep*> > IdentifierSet;
+
+        RefPtr<PropertyNameArrayData> m_data;
+        IdentifierSet m_set;
+        JSGlobalData* m_globalData;
+        bool m_cacheable;
+    };
+
+} // namespace JSC
+
+#endif // PropertyNameArray_h