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Add support for large object IsSlotInBlackObject to filter out all dead slots correctly.

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BUG=chromium:454297
LOG=n

Review URL: https://codereview.chromium.org/1268663004

Cr-Commit-Position: refs/heads/master@{#29979}
This commit is contained in:
hpayer 2015-08-03 08:23:52 -07:00 committed by Commit bot
parent e16cfe562d
commit 82e1069330
1 changed files with 13 additions and 13 deletions
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22
src/heap/mark-compact.cc
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@ -3078,12 +3078,19 @@ bool MarkCompactCollector::TryPromoteObject(HeapObject* object,
bool MarkCompactCollector::IsSlotInBlackObject(Page* p, Address slot,
HeapObject** out_object) {
// This function does not support large objects right now.
Space* owner = p->owner();
if (owner == heap_->lo_space() || owner == NULL) {
*out_object = NULL;
Object* large_object = heap_->lo_space()->FindObject(slot);
// This object has to exist, otherwise we would not have recorded a slot
// for it.
CHECK(large_object->IsHeapObject());
HeapObject* large_heap_object = HeapObject::cast(large_object);
if (IsMarked(large_heap_object)) {
*out_object = large_heap_object;
return true;
}
return false;
}
uint32_t mark_bit_index = p->AddressToMarkbitIndex(slot);
unsigned int start_index = mark_bit_index >> Bitmap::kBitsPerCellLog2;
@ -3199,13 +3206,8 @@ bool MarkCompactCollector::IsSlotInLiveObject(Address slot) {
return false;
}
// |object| is NULL only when the slot belongs to large object space.
DCHECK(object != NULL ||
Page::FromAnyPointerAddress(heap_, slot)->owner() ==
heap_->lo_space());
// We don't need to check large objects' layout descriptor since it can't
// contain in-object fields anyway.
if (object != NULL) {
DCHECK(object != NULL);
switch (object->ContentType()) {
case HeapObjectContents::kTaggedValues:
return true;
@ -3234,8 +3236,6 @@ bool MarkCompactCollector::IsSlotInLiveObject(Address slot) {
}
}
UNREACHABLE();
}
return true;
}