Precisely sweep scan on scavenge pages and use heap iterator to iterate over them.
BUG= R=jarin@chromium.org Review URL: https://codereview.chromium.org/362313002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22154 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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@ -4145,6 +4145,16 @@ void MarkCompactCollector::SweepSpace(PagedSpace* space, SweeperType sweeper) {
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SweepConservatively<SWEEP_SEQUENTIALLY>(space, NULL, p);
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pages_swept++;
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parallel_sweeping_active = true;
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} else {
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if (p->scan_on_scavenge()) {
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SweepPrecisely<SWEEP_ONLY, IGNORE_SKIP_LIST, IGNORE_FREE_SPACE>(
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space, p, NULL);
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pages_swept++;
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if (FLAG_gc_verbose) {
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PrintF("Sweeping 0x%" V8PRIxPTR
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" scan on scavenge page precisely.\n",
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reinterpret_cast<intptr_t>(p));
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}
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} else {
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if (FLAG_gc_verbose) {
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PrintF("Sweeping 0x%" V8PRIxPTR " conservatively in parallel.\n",
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@ -4153,6 +4163,7 @@ void MarkCompactCollector::SweepSpace(PagedSpace* space, SweeperType sweeper) {
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p->set_parallel_sweeping(MemoryChunk::PARALLEL_SWEEPING_PENDING);
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space->IncreaseUnsweptFreeBytes(p);
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}
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}
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space->set_end_of_unswept_pages(p);
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break;
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}
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@ -552,8 +552,21 @@ void StoreBuffer::IteratePointersToNewSpace(ObjectSlotCallback slot_callback,
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FindPointersToNewSpaceInMapsRegion(
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start, end, slot_callback, clear_maps);
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} else {
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ASSERT(page->WasSweptPrecisely());
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HeapObjectIterator iterator(page, NULL);
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for (HeapObject* heap_object = iterator.Next();
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heap_object != NULL;
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heap_object = iterator.Next()) {
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// We skip filler, free space, and constant pool objects.
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if (!heap_object->IsFiller() &&
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!heap_object->IsConstantPoolArray()) {
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FindPointersToNewSpaceInRegion(
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start, end, slot_callback, clear_maps);
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heap_object->address() + HeapObject::kHeaderSize,
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heap_object->address() + heap_object->Size(),
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slot_callback,
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clear_maps);
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}
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}
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}
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}
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}
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