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diff --git a/Source/JavaScriptCore/wtf/RefPtr.h b/Source/JavaScriptCore/wtf/RefPtr.h
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+++ b/Source/JavaScriptCore/wtf/RefPtr.h
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+/*
+ *  Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 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.
+ *
+ */
+
+// RefPtr and PassRefPtr are documented at http://webkit.org/coding/RefPtr.html
+
+#ifndef WTF_RefPtr_h
+#define WTF_RefPtr_h
+
+#include <algorithm>
+#include "FastAllocBase.h"
+#include "PassRefPtr.h"
+
+namespace WTF {
+
+    enum PlacementNewAdoptType { PlacementNewAdopt };
+
+    template<typename T> class PassRefPtr;
+    template<typename T> class NonNullPassRefPtr;
+
+    enum HashTableDeletedValueType { HashTableDeletedValue };
+
+    template<typename T> class RefPtr : public FastAllocBase {
+    public:
+        ALWAYS_INLINE RefPtr() : m_ptr(0) { }
+        ALWAYS_INLINE RefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); }
+        ALWAYS_INLINE RefPtr(const RefPtr& o) : m_ptr(o.m_ptr) { refIfNotNull(m_ptr); }
+        template<typename U> RefPtr(const RefPtr<U>& o) : m_ptr(o.get()) { refIfNotNull(m_ptr); }
+
+        // See comments in PassRefPtr.h for an explanation of why these takes const references.
+        template<typename U> RefPtr(const PassRefPtr<U>&);
+        template<typename U> RefPtr(const NonNullPassRefPtr<U>&);
+
+        // Special constructor for cases where we overwrite an object in place.
+        ALWAYS_INLINE RefPtr(PlacementNewAdoptType) { }
+
+        // Hash table deleted values, which are only constructed and never copied or destroyed.
+        RefPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
+        bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
+
+        ALWAYS_INLINE ~RefPtr() { derefIfNotNull(m_ptr); }
+
+        T* get() const { return m_ptr; }
+        
+        void clear();
+        PassRefPtr<T> release() { PassRefPtr<T> tmp = adoptRef(m_ptr); m_ptr = 0; return tmp; }
+
+        T& operator*() const { return *m_ptr; }
+        ALWAYS_INLINE T* operator->() const { return m_ptr; }
+        
+        bool operator!() const { return !m_ptr; }
+    
+        // This conversion operator allows implicit conversion to bool but not to other integer types.
+        typedef T* (RefPtr::*UnspecifiedBoolType);
+        operator UnspecifiedBoolType() const { return m_ptr ? &RefPtr::m_ptr : 0; }
+        
+        RefPtr& operator=(const RefPtr&);
+        RefPtr& operator=(T*);
+        RefPtr& operator=(const PassRefPtr<T>&);
+        RefPtr& operator=(const NonNullPassRefPtr<T>&);
+#if !HAVE(NULLPTR)
+        RefPtr& operator=(std::nullptr_t) { clear(); return *this; }
+#endif
+        template<typename U> RefPtr& operator=(const RefPtr<U>&);
+        template<typename U> RefPtr& operator=(const PassRefPtr<U>&);
+        template<typename U> RefPtr& operator=(const NonNullPassRefPtr<U>&);
+
+        void swap(RefPtr&);
+
+        static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
+
+    private:
+        T* m_ptr;
+    };
+    
+    template<typename T> template<typename U> inline RefPtr<T>::RefPtr(const PassRefPtr<U>& o)
+        : m_ptr(o.leakRef())
+    {
+    }
+
+    template<typename T> template<typename U> inline RefPtr<T>::RefPtr(const NonNullPassRefPtr<U>& o)
+        : m_ptr(o.leakRef())
+    {
+    }
+
+    template<typename T> inline void RefPtr<T>::clear()
+    {
+        T* ptr = m_ptr;
+        m_ptr = 0;
+        derefIfNotNull(ptr);
+    }
+
+    template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<T>& o)
+    {
+        T* optr = o.get();
+        refIfNotNull(optr);
+        T* ptr = m_ptr;
+        m_ptr = optr;
+        derefIfNotNull(ptr);
+        return *this;
+    }
+    
+    template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const RefPtr<U>& o)
+    {
+        T* optr = o.get();
+        refIfNotNull(optr);
+        T* ptr = m_ptr;
+        m_ptr = optr;
+        derefIfNotNull(ptr);
+        return *this;
+    }
+    
+    template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(T* optr)
+    {
+        refIfNotNull(optr);
+        T* ptr = m_ptr;
+        m_ptr = optr;
+        derefIfNotNull(ptr);
+        return *this;
+    }
+
+    template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<T>& o)
+    {
+        T* ptr = m_ptr;
+        m_ptr = o.leakRef();
+        derefIfNotNull(ptr);
+        return *this;
+    }
+
+    template<typename T> inline RefPtr<T>& RefPtr<T>::operator=(const NonNullPassRefPtr<T>& o)
+    {
+        T* ptr = m_ptr;
+        m_ptr = o.leakRef();
+        derefIfNotNull(ptr);
+        return *this;
+    }
+
+    template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const PassRefPtr<U>& o)
+    {
+        T* ptr = m_ptr;
+        m_ptr = o.leakRef();
+        derefIfNotNull(ptr);
+        return *this;
+    }
+
+    template<typename T> template<typename U> inline RefPtr<T>& RefPtr<T>::operator=(const NonNullPassRefPtr<U>& o)
+    {
+        T* ptr = m_ptr;
+        m_ptr = o.leakRef();
+        derefIfNotNull(ptr);
+        return *this;
+    }
+
+    template<class T> inline void RefPtr<T>::swap(RefPtr<T>& o)
+    {
+        std::swap(m_ptr, o.m_ptr);
+    }
+
+    template<class T> inline void swap(RefPtr<T>& a, RefPtr<T>& b)
+    {
+        a.swap(b);
+    }
+
+    template<typename T, typename U> inline bool operator==(const RefPtr<T>& a, const RefPtr<U>& b)
+    { 
+        return a.get() == b.get(); 
+    }
+
+    template<typename T, typename U> inline bool operator==(const RefPtr<T>& a, U* b)
+    { 
+        return a.get() == b; 
+    }
+    
+    template<typename T, typename U> inline bool operator==(T* a, const RefPtr<U>& b) 
+    {
+        return a == b.get(); 
+    }
+    
+    template<typename T, typename U> inline bool operator!=(const RefPtr<T>& a, const RefPtr<U>& b)
+    { 
+        return a.get() != b.get(); 
+    }
+
+    template<typename T, typename U> inline bool operator!=(const RefPtr<T>& a, U* b)
+    {
+        return a.get() != b; 
+    }
+
+    template<typename T, typename U> inline bool operator!=(T* a, const RefPtr<U>& b)
+    { 
+        return a != b.get(); 
+    }
+    
+    template<typename T, typename U> inline RefPtr<T> static_pointer_cast(const RefPtr<U>& p)
+    { 
+        return RefPtr<T>(static_cast<T*>(p.get())); 
+    }
+
+    template<typename T, typename U> inline RefPtr<T> const_pointer_cast(const RefPtr<U>& p)
+    { 
+        return RefPtr<T>(const_cast<T*>(p.get())); 
+    }
+
+    template<typename T> inline T* getPtr(const RefPtr<T>& p)
+    {
+        return p.get();
+    }
+
+} // namespace WTF
+
+using WTF::RefPtr;
+using WTF::static_pointer_cast;
+using WTF::const_pointer_cast;
+
+#endif // WTF_RefPtr_h