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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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608 Heap* heap, Map* map) { | 608 Heap* heap, Map* map) { |
609 // Make sure that the back pointer stored either in the map itself or | 609 // Make sure that the back pointer stored either in the map itself or |
610 // inside its transitions array is marked. Skip recording the back | 610 // inside its transitions array is marked. Skip recording the back |
611 // pointer slot since map space is not compacted. | 611 // pointer slot since map space is not compacted. |
612 StaticVisitor::MarkObject(heap, HeapObject::cast(map->GetBackPointer())); | 612 StaticVisitor::MarkObject(heap, HeapObject::cast(map->GetBackPointer())); |
613 | 613 |
614 // Treat pointers in the transitions array as weak and also mark that | 614 // Treat pointers in the transitions array as weak and also mark that |
615 // array to prevent visiting it later. Skip recording the transition | 615 // array to prevent visiting it later. Skip recording the transition |
616 // array slot, since it will be implicitly recorded when the pointer | 616 // array slot, since it will be implicitly recorded when the pointer |
617 // fields of this map are visited. | 617 // fields of this map are visited. |
618 TransitionArray* transitions = map->unchecked_transition_array(); | 618 if (map->HasTransitionArray()) { |
619 if (transitions->IsTransitionArray()) { | 619 TransitionArray* transitions = map->transitions(); |
620 MarkTransitionArray(heap, transitions); | 620 MarkTransitionArray(heap, transitions); |
621 } else { | |
622 // Already marked by marking map->GetBackPointer() above. | |
623 ASSERT(transitions->IsMap() || transitions->IsUndefined()); | |
624 } | 621 } |
625 | 622 |
626 // Since descriptor arrays are potentially shared, ensure that only the | 623 // Since descriptor arrays are potentially shared, ensure that only the |
627 // descriptors that belong to this map are marked. The first time a | 624 // descriptors that belong to this map are marked. The first time a |
628 // non-empty descriptor array is marked, its header is also visited. The slot | 625 // non-empty descriptor array is marked, its header is also visited. The slot |
629 // holding the descriptor array will be implicitly recorded when the pointer | 626 // holding the descriptor array will be implicitly recorded when the pointer |
630 // fields of this map are visited. | 627 // fields of this map are visited. |
631 DescriptorArray* descriptors = map->instance_descriptors(); | 628 DescriptorArray* descriptors = map->instance_descriptors(); |
632 if (StaticVisitor::MarkObjectWithoutPush(heap, descriptors) && | 629 if (StaticVisitor::MarkObjectWithoutPush(heap, descriptors) && |
633 descriptors->length() > 0) { | 630 descriptors->length() > 0) { |
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945 RelocIterator it(this, mode_mask); | 942 RelocIterator it(this, mode_mask); |
946 for (; !it.done(); it.next()) { | 943 for (; !it.done(); it.next()) { |
947 it.rinfo()->template Visit<StaticVisitor>(heap); | 944 it.rinfo()->template Visit<StaticVisitor>(heap); |
948 } | 945 } |
949 } | 946 } |
950 | 947 |
951 | 948 |
952 } } // namespace v8::internal | 949 } } // namespace v8::internal |
953 | 950 |
954 #endif // V8_OBJECTS_VISITING_INL_H_ | 951 #endif // V8_OBJECTS_VISITING_INL_H_ |
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