396 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) :
397 _c1(c1), _c2(c2) { }
398
399 G1UpdateRSOrPushRefOopClosure::
400 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
401 G1RemSet* rs,
402 G1ParPushHeapRSClosure* push_ref_cl,
403 bool record_refs_into_cset,
404 uint worker_i) :
405 _g1(g1h), _g1_rem_set(rs), _from(NULL),
406 _record_refs_into_cset(record_refs_into_cset),
407 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { }
408
409 // Returns true if the given card contains references that point
410 // into the collection set, if we're checking for such references;
411 // false otherwise.
412
413 bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i,
414 bool check_for_refs_into_cset) {
415 assert(_g1->is_in_exact(_ct_bs->addr_for(card_ptr)),
416 err_msg("Card at " PTR_FORMAT " index " SIZE_FORMAT " representing heap at " PTR_FORMAT " (%u) must be in committed heap",
417 p2i(card_ptr),
418 _ct_bs->index_for(_ct_bs->addr_for(card_ptr)),
419 p2i(_ct_bs->addr_for(card_ptr)),
420 _g1->addr_to_region(_ct_bs->addr_for(card_ptr))));
421
422 // If the card is no longer dirty, nothing to do.
423 if (*card_ptr != CardTableModRefBS::dirty_card_val()) {
424 // No need to return that this card contains refs that point
425 // into the collection set.
426 return false;
427 }
428
429 // Construct the region representing the card.
430 HeapWord* start = _ct_bs->addr_for(card_ptr);
431 // And find the region containing it.
432 HeapRegion* r = _g1->heap_region_containing(start);
433
434 // Why do we have to check here whether a card is on a young region,
435 // given that we dirty young regions and, as a result, the
436 // post-barrier is supposed to filter them out and never to enqueue
437 // them? When we allocate a new region as the "allocation region" we
438 // actually dirty its cards after we release the lock, since card
439 // dirtying while holding the lock was a performance bottleneck. So,
440 // as a result, it is possible for other threads to actually
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396 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) :
397 _c1(c1), _c2(c2) { }
398
399 G1UpdateRSOrPushRefOopClosure::
400 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,
401 G1RemSet* rs,
402 G1ParPushHeapRSClosure* push_ref_cl,
403 bool record_refs_into_cset,
404 uint worker_i) :
405 _g1(g1h), _g1_rem_set(rs), _from(NULL),
406 _record_refs_into_cset(record_refs_into_cset),
407 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { }
408
409 // Returns true if the given card contains references that point
410 // into the collection set, if we're checking for such references;
411 // false otherwise.
412
413 bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i,
414 bool check_for_refs_into_cset) {
415 assert(_g1->is_in_exact(_ct_bs->addr_for(card_ptr)),
416 "Card at " PTR_FORMAT " index " SIZE_FORMAT " representing heap at " PTR_FORMAT " (%u) must be in committed heap",
417 p2i(card_ptr),
418 _ct_bs->index_for(_ct_bs->addr_for(card_ptr)),
419 p2i(_ct_bs->addr_for(card_ptr)),
420 _g1->addr_to_region(_ct_bs->addr_for(card_ptr)));
421
422 // If the card is no longer dirty, nothing to do.
423 if (*card_ptr != CardTableModRefBS::dirty_card_val()) {
424 // No need to return that this card contains refs that point
425 // into the collection set.
426 return false;
427 }
428
429 // Construct the region representing the card.
430 HeapWord* start = _ct_bs->addr_for(card_ptr);
431 // And find the region containing it.
432 HeapRegion* r = _g1->heap_region_containing(start);
433
434 // Why do we have to check here whether a card is on a young region,
435 // given that we dirty young regions and, as a result, the
436 // post-barrier is supposed to filter them out and never to enqueue
437 // them? When we allocate a new region as the "allocation region" we
438 // actually dirty its cards after we release the lock, since card
439 // dirtying while holding the lock was a performance bottleneck. So,
440 // as a result, it is possible for other threads to actually
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