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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef GCInfo_h | 5 #ifndef GCInfo_h |
6 #define GCInfo_h | 6 #define GCInfo_h |
7 | 7 |
8 #include "platform/heap/Visitor.h" | 8 #include "platform/heap/Visitor.h" |
9 #include "wtf/Assertions.h" | 9 #include "wtf/Assertions.h" |
10 #include "wtf/Atomics.h" | 10 #include "wtf/Atomics.h" |
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106 // Blink heap. This meta-data consists of a function pointer used to | 106 // Blink heap. This meta-data consists of a function pointer used to |
107 // trace the pointers in the object during garbage collection, an | 107 // trace the pointers in the object during garbage collection, an |
108 // indication of whether or not the object needs a finalization | 108 // indication of whether or not the object needs a finalization |
109 // callback, and a function pointer used to finalize the object when | 109 // callback, and a function pointer used to finalize the object when |
110 // the garbage collector determines that the object is no longer | 110 // the garbage collector determines that the object is no longer |
111 // reachable. There is a GCInfo struct for each class that directly | 111 // reachable. There is a GCInfo struct for each class that directly |
112 // inherits from GarbageCollected or GarbageCollectedFinalized. | 112 // inherits from GarbageCollected or GarbageCollectedFinalized. |
113 struct GCInfo { | 113 struct GCInfo { |
114 bool hasFinalizer() const { return m_nonTrivialFinalizer; } | 114 bool hasFinalizer() const { return m_nonTrivialFinalizer; } |
115 bool hasVTable() const { return m_hasVTable; } | 115 bool hasVTable() const { return m_hasVTable; } |
| 116 const String& className() const { return m_className; } |
116 TraceCallback m_trace; | 117 TraceCallback m_trace; |
117 FinalizationCallback m_finalize; | 118 FinalizationCallback m_finalize; |
118 bool m_nonTrivialFinalizer; | 119 bool m_nonTrivialFinalizer; |
119 bool m_hasVTable; | 120 bool m_hasVTable; |
120 #if ENABLE(GC_PROFILING) | |
121 // |m_className| is held as a reference to prevent dtor being called at exit
. | 121 // |m_className| is held as a reference to prevent dtor being called at exit
. |
122 const String& m_className; | 122 const String& m_className; |
123 #endif | |
124 }; | 123 }; |
125 | 124 |
126 #if ENABLE(ASSERT) | 125 #if ENABLE(ASSERT) |
127 PLATFORM_EXPORT void assertObjectHasGCInfo(const void*, size_t gcInfoIndex); | 126 PLATFORM_EXPORT void assertObjectHasGCInfo(const void*, size_t gcInfoIndex); |
128 #endif | 127 #endif |
129 | 128 |
130 class GCInfoTable { | 129 class GCInfoTable { |
131 public: | 130 public: |
132 PLATFORM_EXPORT static void ensureGCInfoIndex(const GCInfo*, size_t*); | 131 PLATFORM_EXPORT static void ensureGCInfoIndex(const GCInfo*, size_t*); |
133 | 132 |
134 static void init(); | 133 static void init(); |
135 static void shutdown(); | 134 static void shutdown(); |
136 | 135 |
| 136 static size_t gcInfoIndex() { return s_gcInfoIndex; } |
| 137 |
137 // The (max + 1) GCInfo index supported. | 138 // The (max + 1) GCInfo index supported. |
138 // We assume that 14 bits is enough to represent all possible types: during | 139 // We assume that 14 bits is enough to represent all possible types: during |
139 // telemetry runs, we see about 1000 different types, looking at the output | 140 // telemetry runs, we see about 1000 different types, looking at the output |
140 // of the oilpan gc clang plugin, there appear to be at most about 6000 | 141 // of the oilpan gc clang plugin, there appear to be at most about 6000 |
141 // types, so 14 bits should be more than twice as many bits as we will ever | 142 // types, so 14 bits should be more than twice as many bits as we will ever |
142 // encounter. | 143 // encounter. |
143 static const size_t maxIndex = 1 << 14; | 144 static const size_t maxIndex = 1 << 14; |
144 | 145 |
145 private: | 146 private: |
146 static void resize(); | 147 static void resize(); |
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163 template<typename T> | 164 template<typename T> |
164 struct GCInfoAtBase { | 165 struct GCInfoAtBase { |
165 static size_t index() | 166 static size_t index() |
166 { | 167 { |
167 static_assert(sizeof(T), "T must be fully defined"); | 168 static_assert(sizeof(T), "T must be fully defined"); |
168 static const GCInfo gcInfo = { | 169 static const GCInfo gcInfo = { |
169 TraceTrait<T>::trace, | 170 TraceTrait<T>::trace, |
170 FinalizerTrait<T>::finalize, | 171 FinalizerTrait<T>::finalize, |
171 FinalizerTrait<T>::nonTrivialFinalizer, | 172 FinalizerTrait<T>::nonTrivialFinalizer, |
172 WTF::IsPolymorphic<T>::value, | 173 WTF::IsPolymorphic<T>::value, |
173 #if ENABLE(GC_PROFILING) | |
174 TypenameStringTrait<T>::get() | 174 TypenameStringTrait<T>::get() |
175 #endif | |
176 }; | 175 }; |
177 RETURN_GCINFO_INDEX(); | 176 RETURN_GCINFO_INDEX(); |
178 } | 177 } |
179 }; | 178 }; |
180 | 179 |
181 template<typename T, bool = WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<
T>::Type, GarbageCollected>::value> struct GetGarbageCollectedBase; | 180 template<typename T, bool = WTF::IsSubclassOfTemplate<typename WTF::RemoveConst<
T>::Type, GarbageCollected>::value> struct GetGarbageCollectedBase; |
182 | 181 |
183 template<typename T> | 182 template<typename T> |
184 struct GetGarbageCollectedBase<T, true> { | 183 struct GetGarbageCollectedBase<T, true> { |
185 typedef typename T::GarbageCollectedBase type; | 184 typedef typename T::GarbageCollectedBase type; |
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219 template<typename T, size_t inlineCapacity> | 218 template<typename T, size_t inlineCapacity> |
220 struct GCInfoTrait<HeapVector<T, inlineCapacity>> : public GCInfoTrait<Vector<T,
inlineCapacity, HeapAllocator>> { }; | 219 struct GCInfoTrait<HeapVector<T, inlineCapacity>> : public GCInfoTrait<Vector<T,
inlineCapacity, HeapAllocator>> { }; |
221 template<typename T, size_t inlineCapacity> | 220 template<typename T, size_t inlineCapacity> |
222 struct GCInfoTrait<HeapDeque<T, inlineCapacity>> : public GCInfoTrait<Deque<T, i
nlineCapacity, HeapAllocator>> { }; | 221 struct GCInfoTrait<HeapDeque<T, inlineCapacity>> : public GCInfoTrait<Deque<T, i
nlineCapacity, HeapAllocator>> { }; |
223 template<typename T, typename U, typename V> | 222 template<typename T, typename U, typename V> |
224 struct GCInfoTrait<HeapHashCountedSet<T, U, V>> : public GCInfoTrait<HashCounted
Set<T, U, V, HeapAllocator>> { }; | 223 struct GCInfoTrait<HeapHashCountedSet<T, U, V>> : public GCInfoTrait<HashCounted
Set<T, U, V, HeapAllocator>> { }; |
225 | 224 |
226 } // namespace blink | 225 } // namespace blink |
227 | 226 |
228 #endif | 227 #endif |
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