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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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383 | 383 |
384 | 384 |
385 // Helper class for pruning the symbol table. | 385 // Helper class for pruning the symbol table. |
386 class SymbolTableCleaner : public ObjectVisitor { | 386 class SymbolTableCleaner : public ObjectVisitor { |
387 public: | 387 public: |
388 SymbolTableCleaner() : pointers_removed_(0) { } | 388 SymbolTableCleaner() : pointers_removed_(0) { } |
389 void VisitPointers(Object** start, Object** end) { | 389 void VisitPointers(Object** start, Object** end) { |
390 // Visit all HeapObject pointers in [start, end). | 390 // Visit all HeapObject pointers in [start, end). |
391 for (Object** p = start; p < end; p++) { | 391 for (Object** p = start; p < end; p++) { |
392 if ((*p)->IsHeapObject() && !HeapObject::cast(*p)->IsMarked()) { | 392 if ((*p)->IsHeapObject() && !HeapObject::cast(*p)->IsMarked()) { |
| 393 // Check if the symbol being pruned is an external symbol. We need to |
| 394 // delete the associated external data as this symbol is going away. |
| 395 |
| 396 // Since the object is not marked we can access its map word safely |
| 397 // without having to worry about marking bits in the object header. |
| 398 Map* map = HeapObject::cast(*p)->map(); |
| 399 // Since no objects have yet been moved we can safely access the map of |
| 400 // the object. |
| 401 uint32_t type = map->instance_type(); |
| 402 bool is_external = (type & kStringRepresentationMask) == |
| 403 kExternalStringTag; |
| 404 if (is_external) { |
| 405 bool is_two_byte = (type & kStringEncodingMask) == kTwoByteStringTag; |
| 406 byte* resource_addr = reinterpret_cast<byte*>(*p) + |
| 407 ExternalString::kResourceOffset - |
| 408 kHeapObjectTag; |
| 409 if (is_two_byte) { |
| 410 v8::String::ExternalStringResource* resource = |
| 411 *reinterpret_cast<v8::String::ExternalStringResource**> |
| 412 (resource_addr); |
| 413 delete resource; |
| 414 } else { |
| 415 v8::String::ExternalAsciiStringResource* resource = |
| 416 *reinterpret_cast<v8::String::ExternalAsciiStringResource**> |
| 417 (resource_addr); |
| 418 delete resource; |
| 419 } |
| 420 } |
393 // Set the entry to null_value (as deleted). | 421 // Set the entry to null_value (as deleted). |
394 *p = Heap::null_value(); | 422 *p = Heap::null_value(); |
395 pointers_removed_++; | 423 pointers_removed_++; |
396 } | 424 } |
397 } | 425 } |
398 } | 426 } |
399 | 427 |
400 int PointersRemoved() { | 428 int PointersRemoved() { |
401 return pointers_removed_; | 429 return pointers_removed_; |
402 } | 430 } |
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1727 | 1755 |
1728 void MarkCompactCollector::RebuildRSets() { | 1756 void MarkCompactCollector::RebuildRSets() { |
1729 #ifdef DEBUG | 1757 #ifdef DEBUG |
1730 ASSERT(state_ == RELOCATE_OBJECTS); | 1758 ASSERT(state_ == RELOCATE_OBJECTS); |
1731 state_ = REBUILD_RSETS; | 1759 state_ = REBUILD_RSETS; |
1732 #endif | 1760 #endif |
1733 Heap::RebuildRSets(); | 1761 Heap::RebuildRSets(); |
1734 } | 1762 } |
1735 | 1763 |
1736 } } // namespace v8::internal | 1764 } } // namespace v8::internal |
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