ysr@777: /*
ysr@777:  * Copyright 2001-2007 Sun Microsystems, Inc.  All Rights Reserved.
ysr@777:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777:  *
ysr@777:  * This code is free software; you can redistribute it and/or modify it
ysr@777:  * under the terms of the GNU General Public License version 2 only, as
ysr@777:  * published by the Free Software Foundation.
ysr@777:  *
ysr@777:  * This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ysr@777:  * version 2 for more details (a copy is included in the LICENSE file that
ysr@777:  * accompanied this code).
ysr@777:  *
ysr@777:  * You should have received a copy of the GNU General Public License version
ysr@777:  * 2 along with this work; if not, write to the Free Software Foundation,
ysr@777:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777:  *
ysr@777:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
ysr@777:  * CA 95054 USA or visit www.sun.com if you need additional information or
ysr@777:  * have any questions.
ysr@777:  *
ysr@777:  */
ysr@777: 
ysr@777: inline size_t G1RemSet::n_workers() {
ysr@777:   if (_g1->workers() != NULL) {
ysr@777:     return _g1->workers()->total_workers();
ysr@777:   } else {
ysr@777:     return 1;
ysr@777:   }
ysr@777: }
ysr@777: 
ysr@777: inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, oop* p) {
iveresov@1051:   par_write_ref(from, p, 0);
ysr@777: }
ysr@777: 
ysr@777: inline void HRInto_G1RemSet::write_ref(HeapRegion* from, oop* p) {
ysr@777:   write_ref_nv(from, p);
ysr@777: }
ysr@777: 
ysr@777: inline bool HRInto_G1RemSet::self_forwarded(oop obj) {
ysr@777:   bool result =  (obj->is_forwarded() && (obj->forwardee()== obj));
ysr@777:   return result;
ysr@777: }
ysr@777: 
ysr@777: inline void HRInto_G1RemSet::par_write_ref(HeapRegion* from, oop* p, int tid) {
ysr@777:   oop obj = *p;
ysr@777: #ifdef ASSERT
ysr@777:   // can't do because of races
ysr@777:   // assert(obj == NULL || obj->is_oop(), "expected an oop");
ysr@777: 
ysr@777:   // Do the safe subset of is_oop
ysr@777:   if (obj != NULL) {
ysr@777: #ifdef CHECK_UNHANDLED_OOPS
ysr@777:     oopDesc* o = obj.obj();
ysr@777: #else
ysr@777:     oopDesc* o = obj;
ysr@777: #endif // CHECK_UNHANDLED_OOPS
ysr@777:     assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
ysr@777:     assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
ysr@777:   }
ysr@777: #endif // ASSERT
ysr@777:   assert(from == NULL || from->is_in_reserved(p),
ysr@777:          "p is not in from");
ysr@777:   HeapRegion* to = _g1->heap_region_containing(obj);
ysr@777:   // The test below could be optimized by applying a bit op to to and from.
ysr@777:   if (to != NULL && from != NULL && from != to) {
iveresov@1051:     bool update_delayed = false;
iveresov@1051:     // There is a tricky infinite loop if we keep pushing
iveresov@1051:     // self forwarding pointers onto our _new_refs list.
iveresov@1051:     // The _par_traversal_in_progress flag is true during the collection pause,
iveresov@1051:     // false during the evacuation failure handing.
iveresov@1051:     if (_par_traversal_in_progress &&
iveresov@1051:         to->in_collection_set() && !self_forwarded(obj)) {
iveresov@1051:       _new_refs[tid]->push(p);
iveresov@1051:       // Deferred updates to the Cset are either discarded (in the normal case),
iveresov@1051:       // or processed (if an evacuation failure occurs) at the end
iveresov@1051:       // of the collection.
iveresov@1051:       // See HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do().
iveresov@1051:       update_delayed = true;
iveresov@1051:     }
iveresov@1051: 
iveresov@1051:     if (!to->popular() && !update_delayed) {
ysr@777: #if G1_REM_SET_LOGGING
ysr@777:       gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS"
ysr@777:                              " for region [" PTR_FORMAT ", " PTR_FORMAT ")",
ysr@777:                              p, obj,
ysr@777:                              to->bottom(), to->end());
ysr@777: #endif
ysr@777:       assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
ysr@777:       if (to->rem_set()->add_reference(p, tid)) {
ysr@777:         _g1->schedule_popular_region_evac(to);
ysr@777:       }
ysr@777:     }
ysr@777:   }
ysr@777: }