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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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368 // Return the script wrapper directly from the cache. | 368 // Return the script wrapper directly from the cache. |
369 return Handle<JSValue>( | 369 return Handle<JSValue>( |
370 reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); | 370 reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); |
371 } | 371 } |
372 Isolate* isolate = Isolate::Current(); | 372 Isolate* isolate = Isolate::Current(); |
373 // Construct a new script wrapper. | 373 // Construct a new script wrapper. |
374 isolate->counters()->script_wrappers()->Increment(); | 374 isolate->counters()->script_wrappers()->Increment(); |
375 Handle<JSFunction> constructor = isolate->script_function(); | 375 Handle<JSFunction> constructor = isolate->script_function(); |
376 Handle<JSValue> result = | 376 Handle<JSValue> result = |
377 Handle<JSValue>::cast(isolate->factory()->NewJSObject(constructor)); | 377 Handle<JSValue>::cast(isolate->factory()->NewJSObject(constructor)); |
378 | |
379 // The allocation might have triggered a GC, which could have called this | |
380 // function recursively, and a wrapper has already been created and cached. | |
381 // In that case, simply return the cached wrapper. | |
382 if (script->wrapper()->foreign_address() != NULL) { | |
383 return Handle<JSValue>( | |
384 reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); | |
385 } | |
386 | |
387 result->set_value(*script); | 378 result->set_value(*script); |
388 | 379 |
389 // Create a new weak global handle and use it to cache the wrapper | 380 // Create a new weak global handle and use it to cache the wrapper |
390 // for future use. The cache will automatically be cleared by the | 381 // for future use. The cache will automatically be cleared by the |
391 // garbage collector when it is not used anymore. | 382 // garbage collector when it is not used anymore. |
392 Handle<Object> handle = isolate->global_handles()->Create(*result); | 383 Handle<Object> handle = isolate->global_handles()->Create(*result); |
393 isolate->global_handles()->MakeWeak(handle.location(), NULL, | 384 isolate->global_handles()->MakeWeak(handle.location(), NULL, |
394 &ClearWrapperCache); | 385 &ClearWrapperCache); |
395 script->wrapper()->set_foreign_address( | 386 script->wrapper()->set_foreign_address( |
396 reinterpret_cast<Address>(handle.location())); | 387 reinterpret_cast<Address>(handle.location())); |
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1087 data->next = prev_next_; | 1078 data->next = prev_next_; |
1088 data->limit = prev_limit_; | 1079 data->limit = prev_limit_; |
1089 #ifdef DEBUG | 1080 #ifdef DEBUG |
1090 handles_detached_ = true; | 1081 handles_detached_ = true; |
1091 #endif | 1082 #endif |
1092 return deferred; | 1083 return deferred; |
1093 } | 1084 } |
1094 | 1085 |
1095 | 1086 |
1096 } } // namespace v8::internal | 1087 } } // namespace v8::internal |
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