Make Resource RefCountedWillBeGarbageCollectedFinalized, attempt #2

third_party/WebKit/Source/core/fetch/ResourcePtr.h

-/*
- * Copyright (C) 2008 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 ResourcePtr_h
-#define ResourcePtr_h
-
-#include "core/CoreExport.h"
-#include "core/fetch/Resource.h"
-#include "wtf/Allocator.h"
-
-namespace blink {
-
-class CORE_EXPORT ResourcePtrBase {
-    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-public:
-    Resource* get() const { return m_resource; }
-    bool operator!() const { return !m_resource; }
-    void clear() { setResource(nullptr); }
-
-    // This conversion operator allows implicit conversion to bool but not to other integer types.
-    typedef Resource* ResourcePtrBase::*UnspecifiedBoolType;
-    operator UnspecifiedBoolType() const { return m_resource ? &ResourcePtrBase::m_resource : nullptr; }
-
-protected:
-    ResourcePtrBase() : m_resource(nullptr) { }
-    explicit ResourcePtrBase(Resource*);
-    explicit ResourcePtrBase(const ResourcePtrBase&);
-    ~ResourcePtrBase();
-
-    void setResource(Resource*);
-
-private:
-    friend class Resource;
-    ResourcePtrBase& operator=(const ResourcePtrBase&) = delete;
-
-    // The lifetime of the Resource object is explicitly managed by
-    // reference-counting.
-    GC_PLUGIN_IGNORE("503485")
-    Resource* m_resource;
-};
-
-inline ResourcePtrBase::ResourcePtrBase(Resource* res)
-    : m_resource(res)
-{
-    if (m_resource)
-        m_resource->registerHandle(this);
-}
-
-inline ResourcePtrBase::~ResourcePtrBase()
-{
-    if (m_resource)
-        m_resource->unregisterHandle(this);
-}
-
-inline ResourcePtrBase::ResourcePtrBase(const ResourcePtrBase& o)
-    : m_resource(o.m_resource)
-{
-    if (m_resource)
-        m_resource->registerHandle(this);
-}
-
-template <class R> class ResourcePtr final : public ResourcePtrBase {
-public:
-    ResourcePtr() { }
-    ResourcePtr(R* res) : ResourcePtrBase(res) { }
-    ResourcePtr(const ResourcePtr<R>& o) : ResourcePtrBase(o) { }
-    template<typename U> ResourcePtr(const ResourcePtr<U>& o) : ResourcePtrBase(cast(o.get())) { }
-
-    R* get() const { return static_cast<R*>(ResourcePtrBase::get()); }
-    R* operator->() const { return get(); }
-
-    ResourcePtr& operator=(R* res) { setResource(res); return *this; }
-    ResourcePtr& operator=(const ResourcePtr& o) { setResource(o.get()); return *this; }
-    template<typename U> ResourcePtr& operator=(const ResourcePtr<U>& o) { setResource(cast(o.get())); return *this; }
-
-    bool operator==(const ResourcePtrBase& o) const { return get() == o.get(); }
-    bool operator!=(const ResourcePtrBase& o) const { return get() != o.get(); }
-private:
-    template<typename U> static R* cast(U* u) { return u; }
-};
-
-template <class R, class RR> bool operator==(const ResourcePtr<R>& h, const RR* res)
-{
-    return h.get() == res;
-}
-template <class R, class RR> bool operator==(const RR* res, const ResourcePtr<R>& h)
-{
-    return h.get() == res;
-}
-template <class R, class RR> bool operator!=(const ResourcePtr<R>& h, const RR* res)
-{
-    return h.get() != res;
-}
-template <class R, class RR> bool operator!=(const RR* res, const ResourcePtr<R>& h)
-{
-    return h.get() != res;
-}
-} // namespace blink
-
-#endif