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Side by Side Diff: third_party/WebKit/Source/wtf/RefCounted.h

Issue 1436153002: Apply clang-format with Chromium-style without column limit. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 1 month ago
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1 /* 1 /*
2 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. 2 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
3 * 3 *
4 * This library is free software; you can redistribute it and/or 4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public 5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either 6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version. 7 * version 2 of the License, or (at your option) any later version.
8 * 8 *
9 * This library is distributed in the hope that it will be useful, 9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
(...skipping 22 matching lines...) Expand all
33 #else 33 #else
34 #define CHECK_REF_COUNTED_LIFECYCLE 0 34 #define CHECK_REF_COUNTED_LIFECYCLE 0
35 #endif 35 #endif
36 36
37 namespace WTF { 37 namespace WTF {
38 38
39 // This base class holds the non-template methods and attributes. 39 // This base class holds the non-template methods and attributes.
40 // The RefCounted class inherits from it reducing the template bloat 40 // The RefCounted class inherits from it reducing the template bloat
41 // generated by the compiler (technique called template hoisting). 41 // generated by the compiler (technique called template hoisting).
42 class WTF_EXPORT RefCountedBase { 42 class WTF_EXPORT RefCountedBase {
43 public: 43 public:
44 void ref() 44 void ref() {
45 {
46 #if CHECK_REF_COUNTED_LIFECYCLE 45 #if CHECK_REF_COUNTED_LIFECYCLE
47 // Start thread verification as soon as the ref count gets to 2. This 46 // Start thread verification as soon as the ref count gets to 2. This
48 // heuristic reflects the fact that items are often created on one threa d 47 // heuristic reflects the fact that items are often created on one thread
49 // and then given to another thread to be used. 48 // and then given to another thread to be used.
50 // FIXME: Make this restriction tigher. Especially as we move to more 49 // FIXME: Make this restriction tigher. Especially as we move to more
51 // common methods for sharing items across threads like CrossThreadCopie r.h 50 // common methods for sharing items across threads like CrossThreadCopier.h
52 // We should be able to add a "detachFromThread" method to make this exp licit. 51 // We should be able to add a "detachFromThread" method to make this explici t.
53 if (m_refCount == 1) 52 if (m_refCount == 1)
54 m_verifier.setShared(true); 53 m_verifier.setShared(true);
55 // If this assert fires, it either indicates a thread safety issue or 54 // If this assert fires, it either indicates a thread safety issue or
56 // that the verification needs to change. See ThreadRestrictionVerifier for 55 // that the verification needs to change. See ThreadRestrictionVerifier for
57 // the different modes. 56 // the different modes.
58 ASSERT(m_verifier.isSafeToUse()); 57 ASSERT(m_verifier.isSafeToUse());
59 ASSERT(!m_adoptionIsRequired); 58 ASSERT(!m_adoptionIsRequired);
60 #endif 59 #endif
61 ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun); 60 ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
62 ++m_refCount; 61 ++m_refCount;
63 } 62 }
64 63
65 bool hasOneRef() const 64 bool hasOneRef() const {
66 { 65 ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
67 ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
68 #if CHECK_REF_COUNTED_LIFECYCLE 66 #if CHECK_REF_COUNTED_LIFECYCLE
69 ASSERT(m_verifier.isSafeToUse()); 67 ASSERT(m_verifier.isSafeToUse());
70 #endif 68 #endif
71 return m_refCount == 1; 69 return m_refCount == 1;
72 } 70 }
73 71
74 int refCount() const 72 int refCount() const {
75 {
76 #if CHECK_REF_COUNTED_LIFECYCLE 73 #if CHECK_REF_COUNTED_LIFECYCLE
77 ASSERT(m_verifier.isSafeToUse()); 74 ASSERT(m_verifier.isSafeToUse());
78 #endif 75 #endif
79 return m_refCount; 76 return m_refCount;
80 } 77 }
81 78
82 protected: 79 protected:
83 RefCountedBase() 80 RefCountedBase()
84 : m_refCount(1) 81 : m_refCount(1)
85 #if ENABLE(SECURITY_ASSERT) 82 #if ENABLE(SECURITY_ASSERT)
86 , m_deletionHasBegun(false) 83 ,
84 m_deletionHasBegun(false)
87 #endif 85 #endif
88 #if CHECK_REF_COUNTED_LIFECYCLE 86 #if CHECK_REF_COUNTED_LIFECYCLE
89 , m_adoptionIsRequired(true) 87 ,
88 m_adoptionIsRequired(true)
90 #endif 89 #endif
91 { 90 {
92 } 91 }
93 92
94 ~RefCountedBase() 93 ~RefCountedBase() {
95 { 94 ASSERT_WITH_SECURITY_IMPLICATION(m_deletionHasBegun);
96 ASSERT_WITH_SECURITY_IMPLICATION(m_deletionHasBegun);
97 #if CHECK_REF_COUNTED_LIFECYCLE 95 #if CHECK_REF_COUNTED_LIFECYCLE
98 ASSERT(!m_adoptionIsRequired); 96 ASSERT(!m_adoptionIsRequired);
99 #endif 97 #endif
100 } 98 }
101 99
102 // Returns whether the pointer should be freed or not. 100 // Returns whether the pointer should be freed or not.
103 bool derefBase() 101 bool derefBase() {
104 { 102 ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
105 ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
106 #if CHECK_REF_COUNTED_LIFECYCLE 103 #if CHECK_REF_COUNTED_LIFECYCLE
107 ASSERT(m_verifier.isSafeToUse()); 104 ASSERT(m_verifier.isSafeToUse());
108 ASSERT(!m_adoptionIsRequired); 105 ASSERT(!m_adoptionIsRequired);
109 #endif 106 #endif
110 107
111 ASSERT(m_refCount > 0); 108 ASSERT(m_refCount > 0);
112 --m_refCount; 109 --m_refCount;
113 if (!m_refCount) { 110 if (!m_refCount) {
114 #if ENABLE(SECURITY_ASSERT) 111 #if ENABLE(SECURITY_ASSERT)
115 m_deletionHasBegun = true; 112 m_deletionHasBegun = true;
116 #endif 113 #endif
117 return true; 114 return true;
118 }
119
120 #if CHECK_REF_COUNTED_LIFECYCLE
121 // Stop thread verification when the ref goes to 1 because it
122 // is safe to be passed to another thread at this point.
123 if (m_refCount == 1)
124 m_verifier.setShared(false);
125 #endif
126 return false;
127 } 115 }
128 116
129 #if CHECK_REF_COUNTED_LIFECYCLE 117 #if CHECK_REF_COUNTED_LIFECYCLE
130 bool deletionHasBegun() const 118 // Stop thread verification when the ref goes to 1 because it
131 { 119 // is safe to be passed to another thread at this point.
132 return m_deletionHasBegun; 120 if (m_refCount == 1)
133 } 121 m_verifier.setShared(false);
122 #endif
123 return false;
124 }
125
126 #if CHECK_REF_COUNTED_LIFECYCLE
127 bool deletionHasBegun() const {
128 return m_deletionHasBegun;
129 }
134 #endif 130 #endif
135 131
136 private: 132 private:
137
138 #if CHECK_REF_COUNTED_LIFECYCLE || ENABLE(SECURITY_ASSERT) 133 #if CHECK_REF_COUNTED_LIFECYCLE || ENABLE(SECURITY_ASSERT)
139 friend void adopted(RefCountedBase*); 134 friend void adopted(RefCountedBase*);
140 #endif 135 #endif
141 136
142 int m_refCount; 137 int m_refCount;
143 #if ENABLE(SECURITY_ASSERT) 138 #if ENABLE(SECURITY_ASSERT)
144 bool m_deletionHasBegun; 139 bool m_deletionHasBegun;
145 #endif 140 #endif
146 #if CHECK_REF_COUNTED_LIFECYCLE 141 #if CHECK_REF_COUNTED_LIFECYCLE
147 bool m_adoptionIsRequired; 142 bool m_adoptionIsRequired;
148 ThreadRestrictionVerifier m_verifier; 143 ThreadRestrictionVerifier m_verifier;
149 #endif 144 #endif
150 }; 145 };
151 146
152 #if CHECK_REF_COUNTED_LIFECYCLE || ENABLE(SECURITY_ASSERT) 147 #if CHECK_REF_COUNTED_LIFECYCLE || ENABLE(SECURITY_ASSERT)
153 inline void adopted(RefCountedBase* object) 148 inline void adopted(RefCountedBase* object) {
154 { 149 if (!object)
155 if (!object) 150 return;
156 return; 151 ASSERT_WITH_SECURITY_IMPLICATION(!object->m_deletionHasBegun);
157 ASSERT_WITH_SECURITY_IMPLICATION(!object->m_deletionHasBegun);
158 #if CHECK_REF_COUNTED_LIFECYCLE 152 #if CHECK_REF_COUNTED_LIFECYCLE
159 object->m_adoptionIsRequired = false; 153 object->m_adoptionIsRequired = false;
160 #endif 154 #endif
161 } 155 }
162 #endif 156 #endif
163 157
164 template<typename T> class RefCounted : public RefCountedBase { 158 template <typename T>
165 WTF_MAKE_NONCOPYABLE(RefCounted); 159 class RefCounted : public RefCountedBase {
166 USING_FAST_MALLOC(RefCounted); 160 WTF_MAKE_NONCOPYABLE(RefCounted);
161 USING_FAST_MALLOC(RefCounted);
167 162
168 public: 163 public:
169 void deref() 164 void deref() {
170 { 165 if (derefBase())
171 if (derefBase()) 166 delete static_cast<T*>(this);
172 delete static_cast<T*>(this); 167 }
173 }
174 168
175 protected: 169 protected:
176 #ifdef ENABLE_INSTANCE_COUNTER 170 #ifdef ENABLE_INSTANCE_COUNTER
177 RefCounted() 171 RefCounted() {
178 { 172 incrementInstanceCount<T>(static_cast<T*>(this));
179 incrementInstanceCount<T>(static_cast<T*>(this)); 173 }
180 }
181 174
182 ~RefCounted() 175 ~RefCounted() {
183 { 176 decrementInstanceCount<T>(static_cast<T*>(this));
184 decrementInstanceCount<T>(static_cast<T*>(this)); 177 }
185 }
186 #else 178 #else
187 RefCounted() 179 RefCounted() {
188 { 180 }
189 }
190 #endif 181 #endif
191 }; 182 };
192 183
193 } // namespace WTF 184 } // namespace WTF
194 185
195 using WTF::RefCounted; 186 using WTF::RefCounted;
196 187
197 #endif // RefCounted_h 188 #endif // RefCounted_h
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