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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 the V8 project 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 V8_HEAP_ARRAY_BUFFER_TRACKER_H_ | 5 #ifndef V8_HEAP_ARRAY_BUFFER_TRACKER_H_ |
6 #define V8_HEAP_ARRAY_BUFFER_TRACKER_H_ | 6 #define V8_HEAP_ARRAY_BUFFER_TRACKER_H_ |
7 | 7 |
8 #include <map> | 8 #include <map> |
9 | 9 |
10 #include "src/allocation.h" | 10 #include "src/allocation.h" |
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23 enum ProcessingMode { | 23 enum ProcessingMode { |
24 kUpdateForwardedRemoveOthers, | 24 kUpdateForwardedRemoveOthers, |
25 kUpdateForwardedKeepOthers, | 25 kUpdateForwardedKeepOthers, |
26 }; | 26 }; |
27 | 27 |
28 // The following methods are used to track raw C++ pointers to externally | 28 // The following methods are used to track raw C++ pointers to externally |
29 // allocated memory used as backing store in live array buffers. | 29 // allocated memory used as backing store in live array buffers. |
30 | 30 |
31 // Register/unregister a new JSArrayBuffer |buffer| for tracking. Guards all | 31 // Register/unregister a new JSArrayBuffer |buffer| for tracking. Guards all |
32 // access to the tracker by taking the page lock for the corresponding page. | 32 // access to the tracker by taking the page lock for the corresponding page. |
33 static void RegisterNew(Heap* heap, JSArrayBuffer* buffer); | 33 inline static void RegisterNew(Heap* heap, JSArrayBuffer* buffer); |
34 static void Unregister(Heap* heap, JSArrayBuffer* buffer); | 34 inline static void Unregister(Heap* heap, JSArrayBuffer* buffer); |
35 | 35 |
36 // Frees all backing store pointers for dead JSArrayBuffers in new space. | 36 // Frees all backing store pointers for dead JSArrayBuffers in new space. |
37 // Does not take any locks and can only be called during Scavenge. | 37 // Does not take any locks and can only be called during Scavenge. |
38 static void FreeDeadInNewSpace(Heap* heap); | 38 static void FreeDeadInNewSpace(Heap* heap); |
39 | 39 |
40 // Frees all backing store pointers for dead JSArrayBuffer on a given page. | 40 // Frees all backing store pointers for dead JSArrayBuffer on a given page. |
41 // Requires marking information to be present. Requires the page lock to be | 41 // Requires marking information to be present. Requires the page lock to be |
42 // taken by the caller. | 42 // taken by the caller. |
43 static void FreeDead(Page* page); | 43 static void FreeDead(Page* page); |
44 | 44 |
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61 public: | 61 public: |
62 typedef std::pair<void*, size_t> Value; | 62 typedef std::pair<void*, size_t> Value; |
63 typedef JSArrayBuffer* Key; | 63 typedef JSArrayBuffer* Key; |
64 | 64 |
65 enum CallbackResult { kKeepEntry, kUpdateEntry, kRemoveEntry }; | 65 enum CallbackResult { kKeepEntry, kUpdateEntry, kRemoveEntry }; |
66 enum FreeMode { kFreeDead, kFreeAll }; | 66 enum FreeMode { kFreeDead, kFreeAll }; |
67 | 67 |
68 explicit LocalArrayBufferTracker(Heap* heap) : heap_(heap) {} | 68 explicit LocalArrayBufferTracker(Heap* heap) : heap_(heap) {} |
69 ~LocalArrayBufferTracker(); | 69 ~LocalArrayBufferTracker(); |
70 | 70 |
71 void Add(Key key, const Value& value); | 71 inline void Add(Key key, const Value& value); |
72 Value Remove(Key key); | 72 inline Value Remove(Key key); |
73 | 73 |
74 // Frees up array buffers determined by |free_mode|. | 74 // Frees up array buffers determined by |free_mode|. |
75 template <FreeMode free_mode> | 75 template <FreeMode free_mode> |
76 void Free(); | 76 void Free(); |
77 | 77 |
78 // Processes buffers one by one. The CallbackResult of the callback decides | 78 // Processes buffers one by one. The CallbackResult of the callback decides |
79 // what action to take on the buffer. | 79 // what action to take on the buffer. |
80 // | 80 // |
81 // Callback should be of type: | 81 // Callback should be of type: |
82 // CallbackResult fn(JSArrayBuffer* buffer, JSArrayBuffer** new_buffer); | 82 // CallbackResult fn(JSArrayBuffer* buffer, JSArrayBuffer** new_buffer); |
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94 // platforms. | 94 // platforms. |
95 typedef std::map<Key, Value> TrackingMap; | 95 typedef std::map<Key, Value> TrackingMap; |
96 | 96 |
97 Heap* heap_; | 97 Heap* heap_; |
98 TrackingMap array_buffers_; | 98 TrackingMap array_buffers_; |
99 }; | 99 }; |
100 | 100 |
101 } // namespace internal | 101 } // namespace internal |
102 } // namespace v8 | 102 } // namespace v8 |
103 #endif // V8_HEAP_ARRAY_BUFFER_TRACKER_H_ | 103 #endif // V8_HEAP_ARRAY_BUFFER_TRACKER_H_ |
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