1 /* 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 inline size_t G1RemSet::n_workers() { 26 if (_g1->workers() != NULL) { 27 return _g1->workers()->total_workers(); 28 } else { 29 return 1; 30 } 31 } 32 33 template <class T> 34 inline void G1RemSet::write_ref_nv(HeapRegion* from, T* p) { 35 par_write_ref_nv(from, p, 0); 36 } 37 38 inline bool G1RemSet::self_forwarded(oop obj) { 39 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); 40 return result; 41 } 42 43 template <class T> 44 inline void G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) { 45 oop obj = oopDesc::load_decode_heap_oop(p); 46 #ifdef ASSERT 47 // can't do because of races 48 // assert(obj == NULL || obj->is_oop(), "expected an oop"); 49 50 // Do the safe subset of is_oop 51 if (obj != NULL) { 52 #ifdef CHECK_UNHANDLED_OOPS 53 oopDesc* o = obj.obj(); 54 #else 55 oopDesc* o = obj; 56 #endif // CHECK_UNHANDLED_OOPS 57 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); 58 assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); 59 } 60 #endif // ASSERT 61 62 assert(from == NULL || from->is_in_reserved(p), "p is not in from"); 63 64 HeapRegion* to = _g1->heap_region_containing(obj); 65 // The test below could be optimized by applying a bit op to to and from. 66 if (to != NULL && from != NULL && from != to) { 67 // The _traversal_in_progress flag is true during the collection pause, 68 // false during the evacuation failure handling. This should avoid a 69 // potential loop if we were to add the card containing 'p' to the DCQS 70 // that's used to regenerate the remembered sets for the collection set, 71 // in the event of an evacuation failure, here. The UpdateRSImmediate 72 // closure will eventally call this routine. 73 if (_traversal_in_progress && 74 to->in_collection_set() && !self_forwarded(obj)) { 75 76 assert(_cset_rs_update_cl[tid] != NULL, "should have been set already"); 77 _cset_rs_update_cl[tid]->do_oop(p); 78 79 // Deferred updates to the CSet are either discarded (in the normal case), 80 // or processed (if an evacuation failure occurs) at the end 81 // of the collection. 82 // See G1RemSet::cleanup_after_oops_into_collection_set_do(). 83 } else { 84 #if G1_REM_SET_LOGGING 85 gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS" 86 " for region [" PTR_FORMAT ", " PTR_FORMAT ")", 87 p, obj, 88 to->bottom(), to->end()); 89 #endif 90 assert(to->rem_set() != NULL, "Need per-region 'into' remsets."); 91 to->rem_set()->add_reference(p, tid); 92 } 93 } 94 } 95 96 template <class T> 97 inline void UpdateRSOopClosure::do_oop_work(T* p) { 98 assert(_from != NULL, "from region must be non-NULL"); 99 _rs->par_write_ref(_from, p, _worker_i); 100 } 101 102 template <class T> 103 inline void UpdateRSetImmediate::do_oop_work(T* p) { 104 assert(_from->is_in_reserved(p), "paranoia"); 105 T heap_oop = oopDesc::load_heap_oop(p); 106 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { 107 _g1_rem_set->par_write_ref(_from, p, 0); 108 } 109 } 110