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-rw-r--r--JavaScriptCore/wtf/PassRefPtr.h311
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diff --git a/JavaScriptCore/wtf/PassRefPtr.h b/JavaScriptCore/wtf/PassRefPtr.h
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--- a/JavaScriptCore/wtf/PassRefPtr.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.
- *
- */
-
-#ifndef WTF_PassRefPtr_h
-#define WTF_PassRefPtr_h
-
-#include "AlwaysInline.h"
-#include "NullPtr.h"
-
-namespace WTF {
-
- template<typename T> class RefPtr;
- template<typename T> class PassRefPtr;
- template<typename T> PassRefPtr<T> adoptRef(T*);
-
- inline void adopted(const void*) { }
-
-#if !COMPILER(WINSCW)
-#if !PLATFORM(QT)
- #define REF_DEREF_INLINE ALWAYS_INLINE
-#else
- // Using ALWAYS_INLINE broke the Qt build. This may be a GCC bug.
- // See https://bugs.webkit.org/show_bug.cgi?id=37253 for details.
- #define REF_DEREF_INLINE inline
-#endif
-#else
- // No inlining for WINSCW compiler to prevent the compiler agressively resolving
- // T::ref() and T::deref(), which will fail compiling when PassRefPtr<T> is used as
- // a class member or function arguments before T is defined.
- #define REF_DEREF_INLINE
-#endif
-
- template<typename T> REF_DEREF_INLINE void refIfNotNull(T* ptr)
- {
- if (LIKELY(ptr != 0))
- ptr->ref();
- }
-
- template<typename T> REF_DEREF_INLINE void derefIfNotNull(T* ptr)
- {
- if (LIKELY(ptr != 0))
- ptr->deref();
- }
-
- #undef REF_DEREF_INLINE
-
- template<typename T> class PassRefPtr {
- public:
- PassRefPtr() : m_ptr(0) { }
- PassRefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(ptr); }
- // It somewhat breaks the type system to allow transfer of ownership out of
- // a const PassRefPtr. However, it makes it much easier to work with PassRefPtr
- // temporaries, and we don't have a need to use real const PassRefPtrs anyway.
- PassRefPtr(const PassRefPtr& o) : m_ptr(o.leakRef()) { }
- template<typename U> PassRefPtr(const PassRefPtr<U>& o) : m_ptr(o.leakRef()) { }
-
- ALWAYS_INLINE ~PassRefPtr() { derefIfNotNull(m_ptr); }
-
- template<typename U> PassRefPtr(const RefPtr<U>&);
-
- T* get() const { return m_ptr; }
-
- void clear();
- T* leakRef() const WARN_UNUSED_RETURN;
-
- T& operator*() const { return *m_ptr; }
- 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* (PassRefPtr::*UnspecifiedBoolType);
- operator UnspecifiedBoolType() const { return m_ptr ? &PassRefPtr::m_ptr : 0; }
-
- PassRefPtr& operator=(T*);
- PassRefPtr& operator=(const PassRefPtr&);
- PassRefPtr& operator=(std::nullptr_t) { clear(); return *this; }
- template<typename U> PassRefPtr& operator=(const PassRefPtr<U>&);
- template<typename U> PassRefPtr& operator=(const RefPtr<U>&);
-
- friend PassRefPtr adoptRef<T>(T*);
-
- // FIXME: Remove releaseRef once we change all callers to call leakRef instead.
- T* releaseRef() const WARN_UNUSED_RETURN { return leakRef(); }
-
- private:
- // adopting constructor
- PassRefPtr(T* ptr, bool) : m_ptr(ptr) { }
-
- mutable T* m_ptr;
- };
-
- // NonNullPassRefPtr: Optimized for passing non-null pointers. A NonNullPassRefPtr
- // begins life non-null, and can only become null through a call to leakRef()
- // or clear().
-
- // FIXME: NonNullPassRefPtr could just inherit from PassRefPtr. However,
- // if we use inheritance, GCC's optimizer fails to realize that destruction
- // of a released NonNullPassRefPtr is a no-op. So, for now, just copy the
- // most important code from PassRefPtr.
- template<typename T> class NonNullPassRefPtr {
- public:
- NonNullPassRefPtr(T* ptr)
- : m_ptr(ptr)
- {
- ASSERT(m_ptr);
- m_ptr->ref();
- }
-
- template<typename U> NonNullPassRefPtr(const RefPtr<U>& o)
- : m_ptr(o.get())
- {
- ASSERT(m_ptr);
- m_ptr->ref();
- }
-
- NonNullPassRefPtr(const NonNullPassRefPtr& o)
- : m_ptr(o.leakRef())
- {
- ASSERT(m_ptr);
- }
-
- template<typename U> NonNullPassRefPtr(const NonNullPassRefPtr<U>& o)
- : m_ptr(o.leakRef())
- {
- ASSERT(m_ptr);
- }
-
- template<typename U> NonNullPassRefPtr(const PassRefPtr<U>& o)
- : m_ptr(o.leakRef())
- {
- ASSERT(m_ptr);
- }
-
- ALWAYS_INLINE ~NonNullPassRefPtr() { derefIfNotNull(m_ptr); }
-
- T* get() const { return m_ptr; }
-
- void clear();
- T* leakRef() const WARN_UNUSED_RETURN { T* tmp = m_ptr; m_ptr = 0; return tmp; }
-
- T& operator*() const { return *m_ptr; }
- T* operator->() const { return m_ptr; }
-
- // FIXME: Remove releaseRef once we change all callers to call leakRef instead.
- T* releaseRef() const WARN_UNUSED_RETURN { return leakRef(); }
-
- private:
- mutable T* m_ptr;
- };
-
- template<typename T> template<typename U> inline PassRefPtr<T>::PassRefPtr(const RefPtr<U>& o)
- : m_ptr(o.get())
- {
- T* ptr = m_ptr;
- refIfNotNull(ptr);
- }
-
- template<typename T> inline void PassRefPtr<T>::clear()
- {
- T* ptr = m_ptr;
- m_ptr = 0;
- derefIfNotNull(ptr);
- }
-
- template<typename T> inline T* PassRefPtr<T>::leakRef() const
- {
- T* ptr = m_ptr;
- m_ptr = 0;
- return ptr;
- }
-
- template<typename T> template<typename U> inline PassRefPtr<T>& PassRefPtr<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 PassRefPtr<T>& PassRefPtr<T>::operator=(T* optr)
- {
- refIfNotNull(optr);
- T* ptr = m_ptr;
- m_ptr = optr;
- derefIfNotNull(ptr);
- return *this;
- }
-
- template<typename T> inline PassRefPtr<T>& PassRefPtr<T>::operator=(const PassRefPtr<T>& ref)
- {
- T* ptr = m_ptr;
- m_ptr = ref.leakRef();
- derefIfNotNull(ptr);
- return *this;
- }
-
- template<typename T> template<typename U> inline PassRefPtr<T>& PassRefPtr<T>::operator=(const PassRefPtr<U>& ref)
- {
- T* ptr = m_ptr;
- m_ptr = ref.leakRef();
- derefIfNotNull(ptr);
- return *this;
- }
-
- template<typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, const PassRefPtr<U>& b)
- {
- return a.get() == b.get();
- }
-
- template<typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, const RefPtr<U>& b)
- {
- return a.get() == b.get();
- }
-
- template<typename T, typename U> inline bool operator==(const RefPtr<T>& a, const PassRefPtr<U>& b)
- {
- return a.get() == b.get();
- }
-
- template<typename T, typename U> inline bool operator==(const PassRefPtr<T>& a, U* b)
- {
- return a.get() == b;
- }
-
- template<typename T, typename U> inline bool operator==(T* a, const PassRefPtr<U>& b)
- {
- return a == b.get();
- }
-
- template<typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, const PassRefPtr<U>& b)
- {
- return a.get() != b.get();
- }
-
- template<typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, const RefPtr<U>& b)
- {
- return a.get() != b.get();
- }
-
- template<typename T, typename U> inline bool operator!=(const RefPtr<T>& a, const PassRefPtr<U>& b)
- {
- return a.get() != b.get();
- }
-
- template<typename T, typename U> inline bool operator!=(const PassRefPtr<T>& a, U* b)
- {
- return a.get() != b;
- }
-
- template<typename T, typename U> inline bool operator!=(T* a, const PassRefPtr<U>& b)
- {
- return a != b.get();
- }
-
- template<typename T> inline PassRefPtr<T> adoptRef(T* p)
- {
- adopted(p);
- return PassRefPtr<T>(p, true);
- }
-
- template<typename T, typename U> inline PassRefPtr<T> static_pointer_cast(const PassRefPtr<U>& p)
- {
- return adoptRef(static_cast<T*>(p.leakRef()));
- }
-
- template<typename T, typename U> inline PassRefPtr<T> const_pointer_cast(const PassRefPtr<U>& p)
- {
- return adoptRef(const_cast<T*>(p.leakRef()));
- }
-
- template<typename T> inline T* getPtr(const PassRefPtr<T>& p)
- {
- return p.get();
- }
-
- template<typename T> inline void NonNullPassRefPtr<T>::clear()
- {
- T* ptr = m_ptr;
- m_ptr = 0;
- derefIfNotNull(ptr);
- }
-
-} // namespace WTF
-
-using WTF::PassRefPtr;
-using WTF::NonNullPassRefPtr;
-using WTF::adoptRef;
-using WTF::static_pointer_cast;
-using WTF::const_pointer_cast;
-
-#endif // WTF_PassRefPtr_h
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