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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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| 2752 // The second pass updates pointers to new space in all spaces. It is possible | 2752 // The second pass updates pointers to new space in all spaces. It is possible |
| 2753 // to encounter pointers to dead new space objects during traversal of pointers | 2753 // to encounter pointers to dead new space objects during traversal of pointers |
| 2754 // to new space. We should clear them to avoid encountering them during next | 2754 // to new space. We should clear them to avoid encountering them during next |
| 2755 // pointer iteration. This is an issue if the store buffer overflows and we | 2755 // pointer iteration. This is an issue if the store buffer overflows and we |
| 2756 // have to scan the entire old space, including dead objects, looking for | 2756 // have to scan the entire old space, including dead objects, looking for |
| 2757 // pointers to new space. | 2757 // pointers to new space. |
| 2758 void MarkCompactCollector::MigrateObject(Address dst, | 2758 void MarkCompactCollector::MigrateObject(Address dst, |
| 2759 Address src, | 2759 Address src, |
| 2760 int size, | 2760 int size, |
| 2761 AllocationSpace dest) { | 2761 AllocationSpace dest) { |
| 2762 HEAP_PROFILE(heap(), ObjectMoveEvent(src, dst, size)); | 2762 HeapProfiler* heap_profiler = heap()->isolate()->heap_profiler(); |
| 2763 if (heap_profiler->is_profiling()) { |
| 2764 heap_profiler->ObjectMoveEvent(src, dst, size); |
| 2765 } |
| 2763 ASSERT(heap()->AllowedToBeMigrated(HeapObject::FromAddress(src), dest)); | 2766 ASSERT(heap()->AllowedToBeMigrated(HeapObject::FromAddress(src), dest)); |
| 2764 ASSERT(dest != LO_SPACE && size <= Page::kMaxNonCodeHeapObjectSize); | 2767 ASSERT(dest != LO_SPACE && size <= Page::kMaxNonCodeHeapObjectSize); |
| 2765 if (dest == OLD_POINTER_SPACE) { | 2768 if (dest == OLD_POINTER_SPACE) { |
| 2766 Address src_slot = src; | 2769 Address src_slot = src; |
| 2767 Address dst_slot = dst; | 2770 Address dst_slot = dst; |
| 2768 ASSERT(IsAligned(size, kPointerSize)); | 2771 ASSERT(IsAligned(size, kPointerSize)); |
| 2769 | 2772 |
| 2770 for (int remaining = size / kPointerSize; remaining > 0; remaining--) { | 2773 for (int remaining = size / kPointerSize; remaining > 0; remaining--) { |
| 2771 Object* value = Memory::Object_at(src_slot); | 2774 Object* value = Memory::Object_at(src_slot); |
| 2772 | 2775 |
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| 4356 while (buffer != NULL) { | 4359 while (buffer != NULL) { |
| 4357 SlotsBuffer* next_buffer = buffer->next(); | 4360 SlotsBuffer* next_buffer = buffer->next(); |
| 4358 DeallocateBuffer(buffer); | 4361 DeallocateBuffer(buffer); |
| 4359 buffer = next_buffer; | 4362 buffer = next_buffer; |
| 4360 } | 4363 } |
| 4361 *buffer_address = NULL; | 4364 *buffer_address = NULL; |
| 4362 } | 4365 } |
| 4363 | 4366 |
| 4364 | 4367 |
| 4365 } } // namespace v8::internal | 4368 } } // namespace v8::internal |
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