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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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