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1 // Copyright 2007-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2007-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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47 // An object group is used to simulate object relationship in a DOM tree. | 47 // An object group is used to simulate object relationship in a DOM tree. |
48 class ObjectGroup : public Malloced { | 48 class ObjectGroup : public Malloced { |
49 public: | 49 public: |
50 ObjectGroup() : objects_(4) {} | 50 ObjectGroup() : objects_(4) {} |
51 explicit ObjectGroup(size_t capacity) : objects_(capacity) {} | 51 explicit ObjectGroup(size_t capacity) : objects_(capacity) {} |
52 | 52 |
53 List<Object**> objects_; | 53 List<Object**> objects_; |
54 }; | 54 }; |
55 | 55 |
56 | 56 |
| 57 typedef void (*WeakReferenceGuest)(Object* object, void* parameter); |
| 58 |
57 class GlobalHandles : public AllStatic { | 59 class GlobalHandles : public AllStatic { |
58 public: | 60 public: |
59 // Creates a new global handle that is alive until Destroy is called. | 61 // Creates a new global handle that is alive until Destroy is called. |
60 static Handle<Object> Create(Object* value); | 62 static Handle<Object> Create(Object* value); |
61 | 63 |
62 // Destroy a global handle. | 64 // Destroy a global handle. |
63 static void Destroy(Object** location); | 65 static void Destroy(Object** location); |
64 | 66 |
65 // Make the global handle weak and set the callback parameter for the | 67 // Make the global handle weak and set the callback parameter for the |
66 // handle. When the garbage collector recognizes that only weak global | 68 // handle. When the garbage collector recognizes that only weak global |
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92 | 94 |
93 // Process pending weak handles. | 95 // Process pending weak handles. |
94 static void PostGarbageCollectionProcessing(); | 96 static void PostGarbageCollectionProcessing(); |
95 | 97 |
96 // Iterates over all handles. | 98 // Iterates over all handles. |
97 static void IterateRoots(ObjectVisitor* v); | 99 static void IterateRoots(ObjectVisitor* v); |
98 | 100 |
99 // Iterates over all weak roots in heap. | 101 // Iterates over all weak roots in heap. |
100 static void IterateWeakRoots(ObjectVisitor* v); | 102 static void IterateWeakRoots(ObjectVisitor* v); |
101 | 103 |
| 104 // Iterates over weak roots that are bound to a given callback. |
| 105 static void IterateWeakRoots(WeakReferenceGuest f, |
| 106 WeakReferenceCallback callback); |
| 107 |
102 // Find all weak handles satisfying the callback predicate, mark | 108 // Find all weak handles satisfying the callback predicate, mark |
103 // them as pending. | 109 // them as pending. |
104 static void IdentifyWeakHandles(WeakSlotCallback f); | 110 static void IdentifyWeakHandles(WeakSlotCallback f); |
105 | 111 |
106 // Add an object group. | 112 // Add an object group. |
107 // Should only used in GC callback function before a collection. | 113 // Should only used in GC callback function before a collection. |
108 // All groups are destroyed after a mark-compact collection. | 114 // All groups are destroyed after a mark-compact collection. |
109 static void AddGroup(Object*** handles, size_t length); | 115 static void AddGroup(Object*** handles, size_t length); |
110 | 116 |
111 // Returns the object groups. | 117 // Returns the object groups. |
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141 // Free list for DESTROYED global handles not yet deallocated. | 147 // Free list for DESTROYED global handles not yet deallocated. |
142 static Node* first_free_; | 148 static Node* first_free_; |
143 static Node* first_free() { return first_free_; } | 149 static Node* first_free() { return first_free_; } |
144 static void set_first_free(Node* value) { first_free_ = value; } | 150 static void set_first_free(Node* value) { first_free_ = value; } |
145 }; | 151 }; |
146 | 152 |
147 | 153 |
148 } } // namespace v8::internal | 154 } } // namespace v8::internal |
149 | 155 |
150 #endif // V8_GLOBAL_HANDLES_H_ | 156 #endif // V8_GLOBAL_HANDLES_H_ |
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