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8183127: UpdateRSetDeferred should not enqueue cards for NULL references

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Filter out NULL references during generating cards for an object.

Reviewed-by: mgerdin, ehelin
This commit is contained in:
Thomas Schatzl 2017-07-06 10:42:02 +02:00
parent 0be0ab5955
commit 10afb6f4f0
1 changed files with 14 additions and 12 deletions
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26
hotspot/src/share/vm/gc/g1/g1EvacFailure.cpp
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@ -40,27 +40,30 @@ private:
G1CollectedHeap* _g1;
DirtyCardQueue *_dcq;
G1SATBCardTableModRefBS* _ct_bs;
HeapRegion* _from;
public:
UpdateRSetDeferred(DirtyCardQueue* dcq) :
_g1(G1CollectedHeap::heap()), _ct_bs(_g1->g1_barrier_set()), _dcq(dcq), _from(NULL) {}
_g1(G1CollectedHeap::heap()), _ct_bs(_g1->g1_barrier_set()), _dcq(dcq) {}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
assert(_from->is_in_reserved(p), "paranoia");
assert(!_from->is_survivor(), "Unexpected evac failure in survivor region");
assert(_g1->heap_region_containing(p)->is_in_reserved(p), "paranoia");
assert(!_g1->heap_region_containing(p)->is_survivor(), "Unexpected evac failure in survivor region");
if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p))) {
size_t card_index = _ct_bs->index_for(p);
if (_ct_bs->mark_card_deferred(card_index)) {
_dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index));
}
T const o = oopDesc::load_heap_oop(p);
if (oopDesc::is_null(o)) {
return;
}
if (HeapRegion::is_in_same_region(p, oopDesc::decode_heap_oop(o))) {
return;
}
size_t card_index = _ct_bs->index_for(p);
if (_ct_bs->mark_card_deferred(card_index)) {
_dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index));
}
}
void set_region(HeapRegion* from) { _from = from; }
};
class RemoveSelfForwardPtrObjClosure: public ObjectClosure {
@ -210,7 +213,6 @@ public:
&_update_rset_cl,
during_initial_mark,
_worker_id);
_update_rset_cl.set_region(hr);
hr->object_iterate(&rspc);
// Need to zap the remainder area of the processed region.
rspc.zap_remainder();