1 /* 2 * Copyright (c) 2001, 2012, 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_G1OOPCLOSURES_INLINE_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP 27 28 #include "gc_implementation/g1/concurrentMark.inline.hpp" 29 #include "gc_implementation/g1/g1CollectedHeap.hpp" 30 #include "gc_implementation/g1/g1OopClosures.hpp" 31 #include "gc_implementation/g1/g1RemSet.hpp" 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" 33 34 /* 35 * This really ought to be an inline function, but apparently the C++ 36 * compiler sometimes sees fit to ignore inline declarations. Sigh. 37 */ 38 39 template <class T> 40 inline void FilterIntoCSClosure::do_oop_nv(T* p) { 41 T heap_oop = oopDesc::load_heap_oop(p); 42 if (!oopDesc::is_null(heap_oop) && 43 _g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop))) { 44 _oc->do_oop(p); 45 } 46 } 47 48 template <class T> 49 inline void FilterOutOfRegionClosure::do_oop_nv(T* p) { 50 T heap_oop = oopDesc::load_heap_oop(p); 51 if (!oopDesc::is_null(heap_oop)) { 52 HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop); 53 if (obj_hw < _r_bottom || obj_hw >= _r_end) { 54 _oc->do_oop(p); 55 } 56 } 57 } 58 59 // This closure is applied to the fields of the objects that have just been copied. 60 template <class T> 61 inline void G1ParScanClosure::do_oop_nv(T* p) { 62 T heap_oop = oopDesc::load_heap_oop(p); 63 64 if (!oopDesc::is_null(heap_oop)) { 65 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 66 if (_g1->in_cset_fast_test(obj)) { 67 // We're not going to even bother checking whether the object is 68 // already forwarded or not, as this usually causes an immediate 69 // stall. We'll try to prefetch the object (for write, given that 70 // we might need to install the forwarding reference) and we'll 71 // get back to it when pop it from the queue 72 Prefetch::write(obj->mark_addr(), 0); 73 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); 74 75 // slightly paranoid test; I'm trying to catch potential 76 // problems before we go into push_on_queue to know where the 77 // problem is coming from 78 assert((obj == oopDesc::load_decode_heap_oop(p)) || 79 (obj->is_forwarded() && 80 obj->forwardee() == oopDesc::load_decode_heap_oop(p)), 81 "p should still be pointing to obj or to its forwardee"); 82 83 _par_scan_state->push_on_queue(p); 84 } else { 85 _par_scan_state->update_rs(_from, p, _par_scan_state->queue_num()); 86 } 87 } 88 } 89 90 template <class T> 91 inline void G1ParPushHeapRSClosure::do_oop_nv(T* p) { 92 T heap_oop = oopDesc::load_heap_oop(p); 93 94 if (!oopDesc::is_null(heap_oop)) { 95 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 96 if (_g1->in_cset_fast_test(obj)) { 97 Prefetch::write(obj->mark_addr(), 0); 98 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); 99 100 // Place on the references queue 101 _par_scan_state->push_on_queue(p); 102 } 103 } 104 } 105 106 template <class T> 107 inline void G1CMOopClosure::do_oop_nv(T* p) { 108 assert(_g1h->is_in_g1_reserved((HeapWord*) p), "invariant"); 109 assert(!_g1h->is_on_master_free_list( 110 _g1h->heap_region_containing((HeapWord*) p)), "invariant"); 111 112 oop obj = oopDesc::load_decode_heap_oop(p); 113 if (_cm->verbose_high()) { 114 gclog_or_tty->print_cr("[%u] we're looking at location " 115 "*"PTR_FORMAT" = "PTR_FORMAT, 116 _task->worker_id(), p, (void*) obj); 117 } 118 _task->deal_with_reference(obj); 119 } 120 121 template <class T> 122 inline void G1RootRegionScanClosure::do_oop_nv(T* p) { 123 T heap_oop = oopDesc::load_heap_oop(p); 124 if (!oopDesc::is_null(heap_oop)) { 125 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 126 HeapRegion* hr = _g1h->heap_region_containing((HeapWord*) obj); 127 if (hr != NULL) { 128 _cm->grayRoot(obj, obj->size(), _worker_id, hr); 129 } 130 } 131 } 132 133 template <class T> 134 inline void G1Mux2Closure::do_oop_nv(T* p) { 135 // Apply first closure; then apply the second. 136 _c1->do_oop(p); 137 _c2->do_oop(p); 138 } 139 140 template <class T> 141 inline void G1TriggerClosure::do_oop_nv(T* p) { 142 // Record that this closure was actually applied (triggered). 143 _triggered = true; 144 } 145 146 template <class T> 147 inline void G1InvokeIfNotTriggeredClosure::do_oop_nv(T* p) { 148 if (!_trigger_cl->triggered()) { 149 _oop_cl->do_oop(p); 150 } 151 } 152 153 template <class T> 154 inline void G1UpdateRSOrPushRefOopClosure::do_oop_nv(T* p) { 155 oop obj = oopDesc::load_decode_heap_oop(p); 156 #ifdef ASSERT 157 // can't do because of races 158 // assert(obj == NULL || obj->is_oop(), "expected an oop"); 159 160 // Do the safe subset of is_oop 161 if (obj != NULL) { 162 #ifdef CHECK_UNHANDLED_OOPS 163 oopDesc* o = obj.obj(); 164 #else 165 oopDesc* o = obj; 166 #endif // CHECK_UNHANDLED_OOPS 167 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); 168 assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); 169 } 170 #endif // ASSERT 171 172 assert(_from != NULL, "from region must be non-NULL"); 173 assert(_from->is_in_reserved(p), "p is not in from"); 174 175 HeapRegion* to = _g1->heap_region_containing(obj); 176 if (to != NULL && _from != to) { 177 // The _record_refs_into_cset flag is true during the RSet 178 // updating part of an evacuation pause. It is false at all 179 // other times: 180 // * rebuilding the remembered sets after a full GC 181 // * during concurrent refinement. 182 // * updating the remembered sets of regions in the collection 183 // set in the event of an evacuation failure (when deferred 184 // updates are enabled). 185 186 if (_record_refs_into_cset && to->in_collection_set()) { 187 // We are recording references that point into the collection 188 // set and this particular reference does exactly that... 189 // If the referenced object has already been forwarded 190 // to itself, we are handling an evacuation failure and 191 // we have already visited/tried to copy this object 192 // there is no need to retry. 193 if (!self_forwarded(obj)) { 194 assert(_push_ref_cl != NULL, "should not be null"); 195 // Push the reference in the refs queue of the G1ParScanThreadState 196 // instance for this worker thread. 197 _push_ref_cl->do_oop(p); 198 } 199 200 // Deferred updates to the CSet are either discarded (in the normal case), 201 // or processed (if an evacuation failure occurs) at the end 202 // of the collection. 203 // See G1RemSet::cleanup_after_oops_into_collection_set_do(). 204 return; 205 } 206 207 // We either don't care about pushing references that point into the 208 // collection set (i.e. we're not during an evacuation pause) _or_ 209 // the reference doesn't point into the collection set. Either way 210 // we add the reference directly to the RSet of the region containing 211 // the referenced object. 212 assert(to->rem_set() != NULL, "Need per-region 'into' remsets."); 213 to->rem_set()->add_reference(p, _worker_i); 214 } 215 } 216 217 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP