Move files in wtf/ to platform/wtf/ (Part 7).

third_party/WebKit/Source/wtf/RefCounted.h

-/*
- * Copyright (C) 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.
- *
- */
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
-#ifndef RefCounted_h
-#define RefCounted_h
+#include "platform/wtf/RefCounted.h"
 
-#include "wtf/Allocator.h"
-#include "wtf/Assertions.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/WTFExport.h"
-
-#if ENABLE(INSTANCE_COUNTER)
-#include "wtf/InstanceCounter.h"
-#endif
-
-#if DCHECK_IS_ON()
-#define CHECK_REF_COUNTED_LIFECYCLE 1
-#include "wtf/ThreadRestrictionVerifier.h"
-#else
-#define CHECK_REF_COUNTED_LIFECYCLE 0
-#endif
-
-namespace WTF {
-
-// This base class holds the non-template methods and attributes.
-// The RefCounted class inherits from it reducing the template bloat
-// generated by the compiler (technique called template hoisting).
-class WTF_EXPORT RefCountedBase {
- public:
-  void ref() const {
-#if CHECK_REF_COUNTED_LIFECYCLE
-    SECURITY_DCHECK(m_verifier.onRef(m_refCount));
-    DCHECK(!m_adoptionIsRequired);
-#endif
-    SECURITY_DCHECK(!m_deletionHasBegun);
-    ++m_refCount;
-  }
-
-  bool hasOneRef() const {
-    SECURITY_DCHECK(!m_deletionHasBegun);
-#if CHECK_REF_COUNTED_LIFECYCLE
-    SECURITY_DCHECK(m_verifier.isSafeToUse());
-#endif
-    return m_refCount == 1;
-  }
-
-  int refCount() const {
-#if CHECK_REF_COUNTED_LIFECYCLE
-    SECURITY_DCHECK(m_verifier.isSafeToUse());
-#endif
-    return m_refCount;
-  }
-
- protected:
-  RefCountedBase()
-      : m_refCount(1)
-#if ENABLE(SECURITY_ASSERT)
-        ,
-        m_deletionHasBegun(false)
-#endif
-#if CHECK_REF_COUNTED_LIFECYCLE
-        ,
-        m_adoptionIsRequired(true)
-#endif
-  {
-  }
-
-  ~RefCountedBase() {
-    SECURITY_DCHECK(m_deletionHasBegun);
-#if CHECK_REF_COUNTED_LIFECYCLE
-    DCHECK(!m_adoptionIsRequired);
-#endif
-  }
-
-  // Returns whether the pointer should be freed or not.
-  bool derefBase() const {
-    SECURITY_DCHECK(!m_deletionHasBegun);
-#if CHECK_REF_COUNTED_LIFECYCLE
-    SECURITY_DCHECK(m_verifier.onDeref(m_refCount));
-    DCHECK(!m_adoptionIsRequired);
-#endif
-
-    DCHECK_GT(m_refCount, 0);
-    --m_refCount;
-    if (!m_refCount) {
-#if ENABLE(SECURITY_ASSERT)
-      m_deletionHasBegun = true;
-#endif
-      return true;
-    }
-
-    return false;
-  }
-
-#if CHECK_REF_COUNTED_LIFECYCLE
-  bool deletionHasBegun() const { return m_deletionHasBegun; }
-#endif
-
- private:
-#if CHECK_REF_COUNTED_LIFECYCLE || ENABLE(SECURITY_ASSERT)
-  friend void adopted(RefCountedBase*);
-#endif
-
-  mutable int m_refCount;
-#if ENABLE(SECURITY_ASSERT)
-  mutable bool m_deletionHasBegun;
-#endif
-#if CHECK_REF_COUNTED_LIFECYCLE
-  mutable bool m_adoptionIsRequired;
-  mutable ThreadRestrictionVerifier m_verifier;
-#endif
-};
-
-#if CHECK_REF_COUNTED_LIFECYCLE || ENABLE(SECURITY_ASSERT)
-inline void adopted(RefCountedBase* object) {
-  if (!object)
-    return;
-  SECURITY_DCHECK(!object->m_deletionHasBegun);
-#if CHECK_REF_COUNTED_LIFECYCLE
-  object->m_adoptionIsRequired = false;
-#endif
-}
-#endif
-
-template <typename T>
-class RefCounted : public RefCountedBase {
-  WTF_MAKE_NONCOPYABLE(RefCounted);
-
-  // Put |T| in here instead of |RefCounted| so the heap profiler reports |T|
-  // instead of |RefCounted<T>|. This does not affect overloading of operator
-  // new.
-  USING_FAST_MALLOC(T);
-
- public:
-  void deref() const {
-    if (derefBase())
-      delete static_cast<const T*>(this);
-  }
-
- protected:
-#if ENABLE(INSTANCE_COUNTER)
-  RefCounted() { incrementInstanceCount<T>(static_cast<T*>(this)); }
-
-  ~RefCounted() { decrementInstanceCount<T>(static_cast<T*>(this)); }
-#else
-  RefCounted() {}
-#endif
-};
-
-}  // namespace WTF
-
-using WTF::RefCounted;
-
-#endif  // RefCounted_h
+// The contents of this header was moved to platform/wtf as part of
+// WTF migration project. See the following post for details:
+// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ