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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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| 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 | 131 // Copy a global handle |
| 132 static Handle<Object> CopyGlobal(Object** location); | 132 static Handle<Object> CopyGlobal(Object** location); |
| 133 | 133 |
| 134 // Destroy a global handle. | 134 // Destroy a global handle. |
| 135 static void Destroy(Object** location); | 135 static void Destroy(Object** location); |
| 136 | 136 |
| 137 typedef WeakCallbackData<v8::Value, void>::Callback WeakCallback; | 137 typedef WeakCallbackData<v8::Value, void>::Callback WeakCallback; |
| 138 typedef WeakReferenceCallbacks<v8::Value, void>::Revivable RevivableCallback; | |
| 139 | 138 |
| 140 // Make the global handle weak and set the callback parameter for the | 139 // Make the global handle weak and set the callback parameter for the |
| 141 // handle. When the garbage collector recognizes that only weak global | 140 // handle. When the garbage collector recognizes that only weak global |
| 142 // handles point to an object the handles are cleared and the callback | 141 // handles point to an object the handles are cleared and the callback |
| 143 // function is invoked (for each handle) with the handle and corresponding | 142 // function is invoked (for each handle) with the handle and corresponding |
| 144 // parameter as arguments. Note: cleared means set to Smi::FromInt(0). The | 143 // parameter as arguments. Note: cleared means set to Smi::FromInt(0). The |
| 145 // reason is that Smi::FromInt(0) does not change during garage collection. | 144 // reason is that Smi::FromInt(0) does not change during garage collection. |
| 146 static void MakeWeak(Object** location, | 145 static void MakeWeak(Object** location, |
| 147 void* parameter, | 146 void* parameter, |
| 148 WeakCallback weak_callback, | 147 WeakCallback weak_callback); |
| 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 } | |
| 156 | 148 |
| 157 void RecordStats(HeapStats* stats); | 149 void RecordStats(HeapStats* stats); |
| 158 | 150 |
| 159 // Returns the current number of weak handles. | 151 // Returns the current number of weak handles. |
| 160 int NumberOfWeakHandles(); | 152 int NumberOfWeakHandles(); |
| 161 | 153 |
| 162 // Returns the current number of weak handles to global objects. | 154 // Returns the current number of weak handles to global objects. |
| 163 // These handles are also included in NumberOfWeakHandles(). | 155 // These handles are also included in NumberOfWeakHandles(). |
| 164 int NumberOfGlobalObjectWeakHandles(); | 156 int NumberOfGlobalObjectWeakHandles(); |
| 165 | 157 |
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| 408 List<int> new_space_indices_; | 400 List<int> new_space_indices_; |
| 409 int singleton_handles_[NUMBER_OF_SINGLETON_HANDLES]; | 401 int singleton_handles_[NUMBER_OF_SINGLETON_HANDLES]; |
| 410 | 402 |
| 411 DISALLOW_COPY_AND_ASSIGN(EternalHandles); | 403 DISALLOW_COPY_AND_ASSIGN(EternalHandles); |
| 412 }; | 404 }; |
| 413 | 405 |
| 414 | 406 |
| 415 } } // namespace v8::internal | 407 } } // namespace v8::internal |
| 416 | 408 |
| 417 #endif // V8_GLOBAL_HANDLES_H_ | 409 #endif // V8_GLOBAL_HANDLES_H_ |
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