diff -r 000000000000 -r 4f2f89ce4247 JavaScriptCore/wtf/RetainPtr.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/wtf/RetainPtr.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,227 @@
+/*
+ *  Copyright (C) 2005, 2006, 2007, 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 RetainPtr_h
+#define RetainPtr_h
+
+#include "HashTraits.h"
+#include "TypeTraits.h"
+#include <algorithm>
+#include <CoreFoundation/CoreFoundation.h>
+
+#ifdef __OBJC__
+#import <Foundation/Foundation.h>
+#endif
+
+namespace WTF {
+
+    // Unlike most most of our smart pointers, RetainPtr can take either the pointer type or the pointed-to type,
+    // so both RetainPtr<NSDictionary> and RetainPtr<CFDictionaryRef> will work.
+
+    enum AdoptCFTag { AdoptCF };
+    enum AdoptNSTag { AdoptNS };
+    
+#ifdef __OBJC__
+    inline void adoptNSReference(id ptr)
+    {
+        if (ptr) {
+            CFRetain(ptr);
+            [ptr release];
+        }
+    }
+#endif
+
+    template <typename T> class RetainPtr {
+    public:
+        typedef typename RemovePointer<T>::Type ValueType;
+        typedef ValueType* PtrType;
+
+        RetainPtr() : m_ptr(0) {}
+        RetainPtr(PtrType ptr) : m_ptr(ptr) { if (ptr) CFRetain(ptr); }
+
+        RetainPtr(AdoptCFTag, PtrType ptr) : m_ptr(ptr) { }
+        RetainPtr(AdoptNSTag, PtrType ptr) : m_ptr(ptr) { adoptNSReference(ptr); }
+        
+        RetainPtr(const RetainPtr& o) : m_ptr(o.m_ptr) { if (PtrType ptr = m_ptr) CFRetain(ptr); }
+
+        // Hash table deleted values, which are only constructed and never copied or destroyed.
+        RetainPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
+        bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
+        
+        ~RetainPtr() { if (PtrType ptr = m_ptr) CFRelease(ptr); }
+        
+        template <typename U> RetainPtr(const RetainPtr<U>& o) : m_ptr(o.get()) { if (PtrType ptr = m_ptr) CFRetain(ptr); }
+        
+        PtrType get() const { return m_ptr; }
+        
+        PtrType releaseRef() { PtrType tmp = m_ptr; m_ptr = 0; return tmp; }
+        
+        PtrType 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 PtrType RetainPtr::*UnspecifiedBoolType;
+        operator UnspecifiedBoolType() const { return m_ptr ? &RetainPtr::m_ptr : 0; }
+        
+        RetainPtr& operator=(const RetainPtr&);
+        template <typename U> RetainPtr& operator=(const RetainPtr<U>&);
+        RetainPtr& operator=(PtrType);
+        template <typename U> RetainPtr& operator=(U*);
+
+        void adoptCF(PtrType);
+        void adoptNS(PtrType);
+        
+        void swap(RetainPtr&);
+
+    private:
+        static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
+
+        PtrType m_ptr;
+    };
+    
+    template <typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(const RetainPtr<T>& o)
+    {
+        PtrType optr = o.get();
+        if (optr)
+            CFRetain(optr);
+        PtrType ptr = m_ptr;
+        m_ptr = optr;
+        if (ptr)
+            CFRelease(ptr);
+        return *this;
+    }
+    
+    template <typename T> template <typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(const RetainPtr<U>& o)
+    {
+        PtrType optr = o.get();
+        if (optr)
+            CFRetain(optr);
+        PtrType ptr = m_ptr;
+        m_ptr = optr;
+        if (ptr)
+            CFRelease(ptr);
+        return *this;
+    }
+    
+    template <typename T> inline RetainPtr<T>& RetainPtr<T>::operator=(PtrType optr)
+    {
+        if (optr)
+            CFRetain(optr);
+        PtrType ptr = m_ptr;
+        m_ptr = optr;
+        if (ptr)
+            CFRelease(ptr);
+        return *this;
+    }
+
+    template <typename T> inline void RetainPtr<T>::adoptCF(PtrType optr)
+    {
+        PtrType ptr = m_ptr;
+        m_ptr = optr;
+        if (ptr)
+            CFRelease(ptr);
+    }
+
+    template <typename T> inline void RetainPtr<T>::adoptNS(PtrType optr)
+    {
+        adoptNSReference(optr);
+        
+        PtrType ptr = m_ptr;
+        m_ptr = optr;
+        if (ptr)
+            CFRelease(ptr);
+    }
+    
+    template <typename T> template <typename U> inline RetainPtr<T>& RetainPtr<T>::operator=(U* optr)
+    {
+        if (optr)
+            CFRetain(optr);
+        PtrType ptr = m_ptr;
+        m_ptr = optr;
+        if (ptr)
+            CFRelease(ptr);
+        return *this;
+    }
+
+    template <class T> inline void RetainPtr<T>::swap(RetainPtr<T>& o)
+    {
+        std::swap(m_ptr, o.m_ptr);
+    }
+
+    template <class T> inline void swap(RetainPtr<T>& a, RetainPtr<T>& b)
+    {
+        a.swap(b);
+    }
+
+    template <typename T, typename U> inline bool operator==(const RetainPtr<T>& a, const RetainPtr<U>& b)
+    { 
+        return a.get() == b.get(); 
+    }
+
+    template <typename T, typename U> inline bool operator==(const RetainPtr<T>& a, U* b)
+    { 
+        return a.get() == b; 
+    }
+    
+    template <typename T, typename U> inline bool operator==(T* a, const RetainPtr<U>& b) 
+    {
+        return a == b.get(); 
+    }
+    
+    template <typename T, typename U> inline bool operator!=(const RetainPtr<T>& a, const RetainPtr<U>& b)
+    { 
+        return a.get() != b.get(); 
+    }
+
+    template <typename T, typename U> inline bool operator!=(const RetainPtr<T>& a, U* b)
+    {
+        return a.get() != b; 
+    }
+
+    template <typename T, typename U> inline bool operator!=(T* a, const RetainPtr<U>& b)
+    { 
+        return a != b.get(); 
+    }
+    
+    template<typename P> struct HashTraits<RetainPtr<P> > : GenericHashTraits<RetainPtr<P> > {
+        static const bool emptyValueIsZero = true;
+        static void constructDeletedValue(RetainPtr<P>& slot) { new (&slot) RetainPtr<P>(HashTableDeletedValue); }
+        static bool isDeletedValue(const RetainPtr<P>& value) { return value == reinterpret_cast<P*>(-1); }
+    };
+    
+    template<typename P> struct PtrHash<RetainPtr<P> > : PtrHash<P*> {
+        using PtrHash<P*>::hash;
+        static unsigned hash(const RetainPtr<P>& key) { return hash(key.get()); }
+        using PtrHash<P*>::equal;
+        static bool equal(const RetainPtr<P>& a, const RetainPtr<P>& b) { return a == b; }
+        static bool equal(P* a, const RetainPtr<P>& b) { return a == b; }
+        static bool equal(const RetainPtr<P>& a, P* b) { return a == b; }
+    };
+    
+    template<typename P> struct DefaultHash<RetainPtr<P> > { typedef PtrHash<RetainPtr<P> > Hash; };
+
+} // namespace WTF
+
+using WTF::AdoptCF;
+using WTF::AdoptNS;
+using WTF::RetainPtr;
+
+#endif // WTF_RetainPtr_h