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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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195 static inline bool isHeapObjectAlive(T* object) | 195 static inline bool isHeapObjectAlive(T* object) |
196 { | 196 { |
197 static_assert(sizeof(T), "T must be fully defined"); | 197 static_assert(sizeof(T), "T must be fully defined"); |
198 // The strongification of collections relies on the fact that once a | 198 // The strongification of collections relies on the fact that once a |
199 // collection has been strongified, there is no way that it can contain | 199 // collection has been strongified, there is no way that it can contain |
200 // non-live entries, so no entries will be removed. Since you can't set | 200 // non-live entries, so no entries will be removed. Since you can't set |
201 // the mark bit on a null pointer, that means that null pointers are | 201 // the mark bit on a null pointer, that means that null pointers are |
202 // always 'alive'. | 202 // always 'alive'. |
203 if (!object) | 203 if (!object) |
204 return true; | 204 return true; |
| 205 // TODO(keishi): some tests create CrossThreadPersistent on non attached
threads. |
| 206 if (!ThreadState::current()) |
| 207 return true; |
| 208 DCHECK(&ThreadState::current()->heap() == &pageFromObject(object)->arena
()->getThreadState()->heap()); |
205 return ObjectAliveTrait<T>::isHeapObjectAlive(object); | 209 return ObjectAliveTrait<T>::isHeapObjectAlive(object); |
206 } | 210 } |
207 template<typename T> | 211 template<typename T> |
208 static inline bool isHeapObjectAlive(const Member<T>& member) | 212 static inline bool isHeapObjectAlive(const Member<T>& member) |
209 { | 213 { |
210 return isHeapObjectAlive(member.get()); | 214 return isHeapObjectAlive(member.get()); |
211 } | 215 } |
212 template<typename T> | 216 template<typename T> |
213 static inline bool isHeapObjectAlive(const WeakMember<T>& member) | 217 static inline bool isHeapObjectAlive(const WeakMember<T>& member) |
214 { | 218 { |
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594 void VisitorHelper<Derived>::handleWeakCell(Visitor* self, void* object) | 598 void VisitorHelper<Derived>::handleWeakCell(Visitor* self, void* object) |
595 { | 599 { |
596 T** cell = reinterpret_cast<T**>(object); | 600 T** cell = reinterpret_cast<T**>(object); |
597 if (*cell && !ObjectAliveTrait<T>::isHeapObjectAlive(*cell)) | 601 if (*cell && !ObjectAliveTrait<T>::isHeapObjectAlive(*cell)) |
598 *cell = nullptr; | 602 *cell = nullptr; |
599 } | 603 } |
600 | 604 |
601 } // namespace blink | 605 } // namespace blink |
602 | 606 |
603 #endif // Heap_h | 607 #endif // Heap_h |
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