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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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255 } | 255 } |
256 | 256 |
257 // When map collection is enabled we have to mark through map's | 257 // When map collection is enabled we have to mark through map's |
258 // transitions and back pointers in a special way to make these links | 258 // transitions and back pointers in a special way to make these links |
259 // weak. Only maps for subclasses of JSReceiver can have transitions. | 259 // weak. Only maps for subclasses of JSReceiver can have transitions. |
260 STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE); | 260 STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE); |
261 if (FLAG_collect_maps && | 261 if (FLAG_collect_maps && |
262 map_object->instance_type() >= FIRST_JS_RECEIVER_TYPE) { | 262 map_object->instance_type() >= FIRST_JS_RECEIVER_TYPE) { |
263 MarkMapContents(heap, map_object); | 263 MarkMapContents(heap, map_object); |
264 } else { | 264 } else { |
265 StaticVisitor::VisitPointers(heap, | 265 Object** start_slot = |
266 HeapObject::RawField(object, Map::kPointerFieldsBeginOffset), | 266 HeapObject::RawField(object, Map::kPointerFieldsBeginOffset); |
267 HeapObject::RawField(object, Map::kPointerFieldsEndOffset)); | 267 Object** end_slot = |
| 268 HeapObject::RawField(object, Map::kPointerFieldsEndOffset); |
| 269 StaticVisitor::VisitPointers(heap, start_slot, start_slot, end_slot); |
268 } | 270 } |
269 } | 271 } |
270 | 272 |
271 | 273 |
272 template<typename StaticVisitor> | 274 template<typename StaticVisitor> |
273 void StaticMarkingVisitor<StaticVisitor>::VisitCode( | 275 void StaticMarkingVisitor<StaticVisitor>::VisitCode( |
274 Map* map, HeapObject* object) { | 276 Map* map, HeapObject* object) { |
275 Heap* heap = map->GetHeap(); | 277 Heap* heap = map->GetHeap(); |
276 Code* code = Code::cast(object); | 278 Code* code = Code::cast(object); |
277 if (FLAG_cleanup_code_caches_at_gc) { | 279 if (FLAG_cleanup_code_caches_at_gc) { |
278 code->ClearTypeFeedbackCells(heap); | 280 code->ClearTypeFeedbackCells(heap); |
279 } | 281 } |
280 code->CodeIterateBody<StaticVisitor>(heap); | 282 code->CodeIterateBody<StaticVisitor>(heap); |
281 } | 283 } |
282 | 284 |
283 | 285 |
284 template<typename StaticVisitor> | 286 template<typename StaticVisitor> |
285 void StaticMarkingVisitor<StaticVisitor>::VisitJSRegExp( | 287 void StaticMarkingVisitor<StaticVisitor>::VisitJSRegExp( |
286 Map* map, HeapObject* object) { | 288 Map* map, HeapObject* object) { |
287 int last_property_offset = | 289 int last_property_offset = |
288 JSRegExp::kSize + kPointerSize * map->inobject_properties(); | 290 JSRegExp::kSize + kPointerSize * map->inobject_properties(); |
289 StaticVisitor::VisitPointers(map->GetHeap(), | 291 Object** start_slot = |
290 HeapObject::RawField(object, JSRegExp::kPropertiesOffset), | 292 HeapObject::RawField(object, JSRegExp::kPropertiesOffset); |
291 HeapObject::RawField(object, last_property_offset)); | 293 Object** end_slot = |
| 294 HeapObject::RawField(object, last_property_offset); |
| 295 StaticVisitor::VisitPointers( |
| 296 map->GetHeap(), start_slot, start_slot, end_slot); |
292 } | 297 } |
293 | 298 |
294 | 299 |
295 template<typename StaticVisitor> | 300 template<typename StaticVisitor> |
296 void StaticMarkingVisitor<StaticVisitor>::MarkMapContents( | 301 void StaticMarkingVisitor<StaticVisitor>::MarkMapContents( |
297 Heap* heap, Map* map) { | 302 Heap* heap, Map* map) { |
298 // Make sure that the back pointer stored either in the map itself or | 303 // Make sure that the back pointer stored either in the map itself or |
299 // inside its transitions array is marked. Skip recording the back | 304 // inside its transitions array is marked. Skip recording the back |
300 // pointer slot since map space is not compacted. | 305 // pointer slot since map space is not compacted. |
301 StaticVisitor::MarkObject(heap, HeapObject::cast(map->GetBackPointer())); | 306 StaticVisitor::MarkObject(heap, HeapObject::cast(map->GetBackPointer())); |
302 | 307 |
303 // Treat pointers in the transitions array as weak and also mark that | 308 // Treat pointers in the transitions array as weak and also mark that |
304 // array to prevent visiting it later. Skip recording the transition | 309 // array to prevent visiting it later. Skip recording the transition |
305 // array slot, since it will be implicitly recorded when the pointer | 310 // array slot, since it will be implicitly recorded when the pointer |
306 // fields of this map are visited. | 311 // fields of this map are visited. |
307 TransitionArray* transitions = map->unchecked_transition_array(); | 312 TransitionArray* transitions = map->unchecked_transition_array(); |
308 if (transitions->IsTransitionArray()) { | 313 if (transitions->IsTransitionArray()) { |
309 MarkTransitionArray(heap, transitions); | 314 MarkTransitionArray(heap, transitions); |
310 } else { | 315 } else { |
311 // Already marked by marking map->GetBackPointer() above. | 316 // Already marked by marking map->GetBackPointer() above. |
312 ASSERT(transitions->IsMap() || transitions->IsUndefined()); | 317 ASSERT(transitions->IsMap() || transitions->IsUndefined()); |
313 } | 318 } |
314 | 319 |
315 // Mark the pointer fields of the Map. Since the transitions array has | 320 // Mark the pointer fields of the Map. Since the transitions array has |
316 // been marked already, it is fine that one of these fields contains a | 321 // been marked already, it is fine that one of these fields contains a |
317 // pointer to it. | 322 // pointer to it. |
318 StaticVisitor::VisitPointers(heap, | 323 Object** start_slot = |
319 HeapObject::RawField(map, Map::kPointerFieldsBeginOffset), | 324 HeapObject::RawField(map, Map::kPointerFieldsBeginOffset); |
320 HeapObject::RawField(map, Map::kPointerFieldsEndOffset)); | 325 Object** end_slot = |
| 326 HeapObject::RawField(map, Map::kPointerFieldsEndOffset); |
| 327 StaticVisitor::VisitPointers(heap, start_slot, start_slot, end_slot); |
321 } | 328 } |
322 | 329 |
323 | 330 |
324 template<typename StaticVisitor> | 331 template<typename StaticVisitor> |
325 void StaticMarkingVisitor<StaticVisitor>::MarkTransitionArray( | 332 void StaticMarkingVisitor<StaticVisitor>::MarkTransitionArray( |
326 Heap* heap, TransitionArray* transitions) { | 333 Heap* heap, TransitionArray* transitions) { |
327 if (!StaticVisitor::MarkObjectWithoutPush(heap, transitions)) return; | 334 if (!StaticVisitor::MarkObjectWithoutPush(heap, transitions)) return; |
328 | 335 |
329 // Skip recording the descriptors_pointer slot since the cell space | 336 // Skip recording the descriptors_pointer slot since the cell space |
330 // is not compacted and descriptors are referenced through a cell. | 337 // is not compacted and descriptors are referenced through a cell. |
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400 RelocIterator it(this, mode_mask); | 407 RelocIterator it(this, mode_mask); |
401 for (; !it.done(); it.next()) { | 408 for (; !it.done(); it.next()) { |
402 it.rinfo()->template Visit<StaticVisitor>(heap); | 409 it.rinfo()->template Visit<StaticVisitor>(heap); |
403 } | 410 } |
404 } | 411 } |
405 | 412 |
406 | 413 |
407 } } // namespace v8::internal | 414 } } // namespace v8::internal |
408 | 415 |
409 #endif // V8_OBJECTS_VISITING_INL_H_ | 416 #endif // V8_OBJECTS_VISITING_INL_H_ |
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