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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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121 }; | 121 }; |
122 | 122 |
123 | 123 |
124 class GlobalHandles { | 124 class GlobalHandles { |
125 public: | 125 public: |
126 ~GlobalHandles(); | 126 ~GlobalHandles(); |
127 | 127 |
128 // Creates a new global handle that is alive until Destroy is called. | 128 // Creates a new global handle that is alive until Destroy is called. |
129 Handle<Object> Create(Object* value); | 129 Handle<Object> Create(Object* value); |
130 | 130 |
131 // Copy a global handle | |
132 static Handle<Object> CopyGlobal(Object** location); | |
133 | |
131 // Destroy a global handle. | 134 // Destroy a global handle. |
132 static void Destroy(Object** location); | 135 static void Destroy(Object** location); |
133 | 136 |
137 typedef WeakCallbackData<v8::Value, void>::Callback WeakCallback; | |
134 typedef WeakReferenceCallbacks<v8::Value, void>::Revivable RevivableCallback; | 138 typedef WeakReferenceCallbacks<v8::Value, void>::Revivable RevivableCallback; |
135 | 139 |
136 // Make the global handle weak and set the callback parameter for the | 140 // Make the global handle weak and set the callback parameter for the |
137 // handle. When the garbage collector recognizes that only weak global | 141 // handle. When the garbage collector recognizes that only weak global |
138 // handles point to an object the handles are cleared and the callback | 142 // handles point to an object the handles are cleared and the callback |
139 // function is invoked (for each handle) with the handle and corresponding | 143 // function is invoked (for each handle) with the handle and corresponding |
140 // parameter as arguments. Note: cleared means set to Smi::FromInt(0). The | 144 // parameter as arguments. Note: cleared means set to Smi::FromInt(0). The |
141 // reason is that Smi::FromInt(0) does not change during garage collection. | 145 // reason is that Smi::FromInt(0) does not change during garage collection. |
142 static void MakeWeak(Object** location, | 146 static void MakeWeak(Object** location, |
143 void* parameter, | 147 void* parameter, |
144 RevivableCallback weak_reference_callback); | 148 WeakCallback weak_callback, |
Sven Panne
2013/09/05 08:24:09
I'm a bit lost here: Why do we need a 2nd kind of
dcarney
2013/09/05 08:32:05
this handle removes direct access to the underlyin
Sven Panne
2013/09/05 08:43:01
Ah, OK. So the revivable stuff is only there for a
| |
149 RevivableCallback revivable_callback); | |
150 | |
151 static inline void MakeWeak(Object** location, | |
152 void* parameter, | |
153 RevivableCallback revivable_callback) { | |
154 MakeWeak(location, parameter, NULL, revivable_callback); | |
155 } | |
145 | 156 |
146 void RecordStats(HeapStats* stats); | 157 void RecordStats(HeapStats* stats); |
147 | 158 |
148 // Returns the current number of weak handles. | 159 // Returns the current number of weak handles. |
149 int NumberOfWeakHandles(); | 160 int NumberOfWeakHandles(); |
150 | 161 |
151 // Returns the current number of weak handles to global objects. | 162 // Returns the current number of weak handles to global objects. |
152 // These handles are also included in NumberOfWeakHandles(). | 163 // These handles are also included in NumberOfWeakHandles(). |
153 int NumberOfGlobalObjectWeakHandles(); | 164 int NumberOfGlobalObjectWeakHandles(); |
154 | 165 |
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398 List<int> new_space_indices_; | 409 List<int> new_space_indices_; |
399 int singleton_handles_[NUMBER_OF_SINGLETON_HANDLES]; | 410 int singleton_handles_[NUMBER_OF_SINGLETON_HANDLES]; |
400 | 411 |
401 DISALLOW_COPY_AND_ASSIGN(EternalHandles); | 412 DISALLOW_COPY_AND_ASSIGN(EternalHandles); |
402 }; | 413 }; |
403 | 414 |
404 | 415 |
405 } } // namespace v8::internal | 416 } } // namespace v8::internal |
406 | 417 |
407 #endif // V8_GLOBAL_HANDLES_H_ | 418 #endif // V8_GLOBAL_HANDLES_H_ |
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