6971296: G1: simplify G1RemSet class hierarchy
Summary: Remove G1RemSet base class and StupidG1RemSet class; rename HRInto_G1RemSet to just G1RemSet.
Reviewed-by: ysr, tonyp
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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inline size_t G1RemSet::n_workers() {
if (_g1->workers() != NULL) {
return _g1->workers()->total_workers();
} else {
return 1;
}
}
template <class T>
inline void G1RemSet::write_ref_nv(HeapRegion* from, T* p) {
par_write_ref_nv(from, p, 0);
}
inline bool G1RemSet::self_forwarded(oop obj) {
bool result = (obj->is_forwarded() && (obj->forwardee()== obj));
return result;
}
template <class T>
inline void G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) {
oop obj = oopDesc::load_decode_heap_oop(p);
#ifdef ASSERT
// can't do because of races
// assert(obj == NULL || obj->is_oop(), "expected an oop");
// Do the safe subset of is_oop
if (obj != NULL) {
#ifdef CHECK_UNHANDLED_OOPS
oopDesc* o = obj.obj();
#else
oopDesc* o = obj;
#endif // CHECK_UNHANDLED_OOPS
assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
}
#endif // ASSERT
assert(from == NULL || from->is_in_reserved(p), "p is not in from");
HeapRegion* to = _g1->heap_region_containing(obj);
// The test below could be optimized by applying a bit op to to and from.
if (to != NULL && from != NULL && from != to) {
// The _traversal_in_progress flag is true during the collection pause,
// false during the evacuation failure handling. This should avoid a
// potential loop if we were to add the card containing 'p' to the DCQS
// that's used to regenerate the remembered sets for the collection set,
// in the event of an evacuation failure, here. The UpdateRSImmediate
// closure will eventally call this routine.
if (_traversal_in_progress &&
to->in_collection_set() && !self_forwarded(obj)) {
assert(_cset_rs_update_cl[tid] != NULL, "should have been set already");
_cset_rs_update_cl[tid]->do_oop(p);
// Deferred updates to the CSet are either discarded (in the normal case),
// or processed (if an evacuation failure occurs) at the end
// of the collection.
// See G1RemSet::cleanup_after_oops_into_collection_set_do().
} else {
#if G1_REM_SET_LOGGING
gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS"
" for region [" PTR_FORMAT ", " PTR_FORMAT ")",
p, obj,
to->bottom(), to->end());
#endif
assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
to->rem_set()->add_reference(p, tid);
}
}
}
template <class T>
inline void UpdateRSOopClosure::do_oop_work(T* p) {
assert(_from != NULL, "from region must be non-NULL");
_rs->par_write_ref(_from, p, _worker_i);
}
template <class T>
inline void UpdateRSetImmediate::do_oop_work(T* p) {
assert(_from->is_in_reserved(p), "paranoia");
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
_g1_rem_set->par_write_ref(_from, p, 0);
}
}