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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP 27 28 #include "gc_implementation/g1/g1RemSet.hpp" 29 #include "gc_implementation/g1/heapRegionRemSet.hpp" 30 #include "oops/oop.inline.hpp" 31 32 inline size_t G1RemSet::n_workers() { 33 if (_g1->workers() != NULL) { 34 return _g1->workers()->total_workers(); 35 } else { 36 return 1; 37 } 38 } 39 40 template <class T> 41 inline void G1RemSet::write_ref_nv(HeapRegion* from, T* p) { 42 par_write_ref_nv(from, p, 0); 43 } 44 45 inline bool G1RemSet::self_forwarded(oop obj) { 46 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); 47 return result; 48 } 49 50 template <class T> 51 inline void G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) { 52 oop obj = oopDesc::load_decode_heap_oop(p); 53 #ifdef ASSERT 54 // can't do because of races 55 // assert(obj == NULL || obj->is_oop(), "expected an oop"); 56 57 // Do the safe subset of is_oop 58 if (obj != NULL) { 59 #ifdef CHECK_UNHANDLED_OOPS 60 oopDesc* o = obj.obj(); 61 #else 62 oopDesc* o = obj; 63 #endif // CHECK_UNHANDLED_OOPS 64 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); 65 assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); 66 } 67 #endif // ASSERT 68 69 assert(from == NULL || from->is_in_reserved(p), "p is not in from"); 70 71 HeapRegion* to = _g1->heap_region_containing(obj); 72 // The test below could be optimized by applying a bit op to to and from. 73 if (to != NULL && from != NULL && from != to) { 74 // The _traversal_in_progress flag is true during the collection pause, 75 // false during the evacuation failure handling. This should avoid a 76 // potential loop if we were to add the card containing 'p' to the DCQS 77 // that's used to regenerate the remembered sets for the collection set, 78 // in the event of an evacuation failure, here. The UpdateRSImmediate 79 // closure will eventally call this routine. 80 if (_traversal_in_progress && 81 to->in_collection_set() && !self_forwarded(obj)) { 82 83 assert(_cset_rs_update_cl[tid] != NULL, "should have been set already"); 84 _cset_rs_update_cl[tid]->do_oop(p); 85 86 // Deferred updates to the CSet are either discarded (in the normal case), 87 // or processed (if an evacuation failure occurs) at the end 88 // of the collection. 89 // See G1RemSet::cleanup_after_oops_into_collection_set_do(). 90 } else { 91 #if G1_REM_SET_LOGGING 92 gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS" 93 " for region [" PTR_FORMAT ", " PTR_FORMAT ")", 94 p, obj, 95 to->bottom(), to->end()); 96 #endif 97 assert(to->rem_set() != NULL, "Need per-region 'into' remsets."); 98 to->rem_set()->add_reference(p, tid); 99 } 100 } 101 } 102 103 template <class T> 104 inline void UpdateRSOopClosure::do_oop_work(T* p) { 105 assert(_from != NULL, "from region must be non-NULL"); 106 _rs->par_write_ref(_from, p, _worker_i); 107 } 108 109 template <class T> 110 inline void UpdateRSetImmediate::do_oop_work(T* p) { 111 assert(_from->is_in_reserved(p), "paranoia"); 112 T heap_oop = oopDesc::load_heap_oop(p); 113 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { 114 _g1_rem_set->par_write_ref(_from, p, 0); 115 } 116 } 117 118 119 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP