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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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218 isolate->heap()->LookupSingleCharacterStringFromCode(index), Object); | 218 isolate->heap()->LookupSingleCharacterStringFromCode(index), Object); |
219 } | 219 } |
220 | 220 |
221 | 221 |
222 // Wrappers for scripts are kept alive and cached in weak global | 222 // Wrappers for scripts are kept alive and cached in weak global |
223 // handles referred from foreign objects held by the scripts as long as | 223 // handles referred from foreign objects held by the scripts as long as |
224 // they are used. When they are not used anymore, the garbage | 224 // they are used. When they are not used anymore, the garbage |
225 // collector will call the weak callback on the global handle | 225 // collector will call the weak callback on the global handle |
226 // associated with the wrapper and get rid of both the wrapper and the | 226 // associated with the wrapper and get rid of both the wrapper and the |
227 // handle. | 227 // handle. |
228 static void ClearWrapperCache(v8::Isolate* v8_isolate, | 228 static void ClearWrapperCache( |
229 Persistent<v8::Value>* handle, | 229 const v8::WeakCallbackData<v8::Value, void>& data) { |
230 void*) { | 230 Object** location = reinterpret_cast<Object**>(data.GetParameter()); |
231 Handle<Object> cache = Utils::OpenPersistent(handle); | 231 JSValue* wrapper = JSValue::cast(*location); |
232 JSValue* wrapper = JSValue::cast(*cache); | |
233 Foreign* foreign = Script::cast(wrapper->value())->wrapper(); | 232 Foreign* foreign = Script::cast(wrapper->value())->wrapper(); |
234 ASSERT(foreign->foreign_address() == | 233 ASSERT_EQ(foreign->foreign_address(), reinterpret_cast<Address>(location)); |
235 reinterpret_cast<Address>(cache.location())); | |
236 foreign->set_foreign_address(0); | 234 foreign->set_foreign_address(0); |
237 Isolate* isolate = reinterpret_cast<Isolate*>(v8_isolate); | 235 GlobalHandles::Destroy(location); |
238 isolate->global_handles()->Destroy(cache.location()); | 236 Isolate* isolate = reinterpret_cast<Isolate*>(data.GetIsolate()); |
239 isolate->counters()->script_wrappers()->Decrement(); | 237 isolate->counters()->script_wrappers()->Decrement(); |
240 } | 238 } |
241 | 239 |
242 | 240 |
243 Handle<JSValue> GetScriptWrapper(Handle<Script> script) { | 241 Handle<JSValue> GetScriptWrapper(Handle<Script> script) { |
244 if (script->wrapper()->foreign_address() != NULL) { | 242 if (script->wrapper()->foreign_address() != NULL) { |
245 // Return a handle for the existing script wrapper from the cache. | 243 // Return a handle for the existing script wrapper from the cache. |
246 return Handle<JSValue>( | 244 return Handle<JSValue>( |
247 *reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); | 245 *reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); |
248 } | 246 } |
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260 return Handle<JSValue>( | 258 return Handle<JSValue>( |
261 *reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); | 259 *reinterpret_cast<JSValue**>(script->wrapper()->foreign_address())); |
262 } | 260 } |
263 | 261 |
264 result->set_value(*script); | 262 result->set_value(*script); |
265 | 263 |
266 // Create a new weak global handle and use it to cache the wrapper | 264 // Create a new weak global handle and use it to cache the wrapper |
267 // for future use. The cache will automatically be cleared by the | 265 // for future use. The cache will automatically be cleared by the |
268 // garbage collector when it is not used anymore. | 266 // garbage collector when it is not used anymore. |
269 Handle<Object> handle = isolate->global_handles()->Create(*result); | 267 Handle<Object> handle = isolate->global_handles()->Create(*result); |
270 isolate->global_handles()->MakeWeak(handle.location(), | 268 GlobalHandles::MakeWeak(handle.location(), |
271 NULL, | 269 reinterpret_cast<void*>(handle.location()), |
272 &ClearWrapperCache); | 270 &ClearWrapperCache); |
273 script->wrapper()->set_foreign_address( | 271 script->wrapper()->set_foreign_address( |
274 reinterpret_cast<Address>(handle.location())); | 272 reinterpret_cast<Address>(handle.location())); |
275 return result; | 273 return result; |
276 } | 274 } |
277 | 275 |
278 | 276 |
279 // Init line_ends array with code positions of line ends inside script | 277 // Init line_ends array with code positions of line ends inside script |
280 // source. | 278 // source. |
281 void InitScriptLineEnds(Handle<Script> script) { | 279 void InitScriptLineEnds(Handle<Script> script) { |
282 if (!script->line_ends()->IsUndefined()) return; | 280 if (!script->line_ends()->IsUndefined()) return; |
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795 Handle<Code> code) { | 793 Handle<Code> code) { |
796 heap->EnsureWeakObjectToCodeTable(); | 794 heap->EnsureWeakObjectToCodeTable(); |
797 Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(*object)); | 795 Handle<DependentCode> dep(heap->LookupWeakObjectToCodeDependency(*object)); |
798 dep = DependentCode::Insert(dep, DependentCode::kWeaklyEmbeddedGroup, code); | 796 dep = DependentCode::Insert(dep, DependentCode::kWeaklyEmbeddedGroup, code); |
799 CALL_HEAP_FUNCTION_VOID(heap->isolate(), | 797 CALL_HEAP_FUNCTION_VOID(heap->isolate(), |
800 heap->AddWeakObjectToCodeDependency(*object, *dep)); | 798 heap->AddWeakObjectToCodeDependency(*object, *dep)); |
801 } | 799 } |
802 | 800 |
803 | 801 |
804 } } // namespace v8::internal | 802 } } // namespace v8::internal |
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