1 /* 2 * Copyright (c) 2001, 2014, 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/g1ParScanThreadState.inline.hpp" 32 #include "gc_implementation/g1/g1RemSet.hpp" 33 #include "gc_implementation/g1/g1RemSet.inline.hpp" 34 #include "gc_implementation/g1/heapRegionRemSet.hpp" 35 #include "runtime/prefetch.inline.hpp" 36 37 /* 38 * This really ought to be an inline function, but apparently the C++ 39 * compiler sometimes sees fit to ignore inline declarations. Sigh. 40 */ 41 42 template <class T> 43 inline void FilterIntoCSClosure::do_oop_nv(T* p) { 44 T heap_oop = oopDesc::load_heap_oop(p); 45 if (!oopDesc::is_null(heap_oop) && 46 _g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop))) { 47 _oc->do_oop(p); 48 } 49 } 50 51 template <class T> 52 inline void FilterOutOfRegionClosure::do_oop_nv(T* p) { 53 T heap_oop = oopDesc::load_heap_oop(p); 54 if (!oopDesc::is_null(heap_oop)) { 55 HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop); 56 if (obj_hw < _r_bottom || obj_hw >= _r_end) { 57 _oc->do_oop(p); 58 } 59 } 60 } 61 62 // This closure is applied to the fields of the objects that have just been copied. 63 template <class T> 64 inline void G1ParScanClosure::do_oop_nv(T* p) { 65 T heap_oop = oopDesc::load_heap_oop(p); 66 67 if (!oopDesc::is_null(heap_oop)) { 68 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 69 if (_g1->in_cset_fast_test(obj)) { 70 // We're not going to even bother checking whether the object is 71 // already forwarded or not, as this usually causes an immediate 72 // stall. We'll try to prefetch the object (for write, given that 73 // we might need to install the forwarding reference) and we'll 74 // get back to it when pop it from the queue 75 Prefetch::write(obj->mark_addr(), 0); 76 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); 77 78 // slightly paranoid test; I'm trying to catch potential 79 // problems before we go into push_on_queue to know where the 80 // problem is coming from 81 assert((obj == oopDesc::load_decode_heap_oop(p)) || 82 (obj->is_forwarded() && 83 obj->forwardee() == oopDesc::load_decode_heap_oop(p)), 84 "p should still be pointing to obj or to its forwardee"); 85 86 _par_scan_state->push_on_queue(p); 87 } else { 88 _par_scan_state->update_rs(_from, p, _worker_id); 89 } 90 } 91 } 92 93 template <class T> 94 inline void G1ParPushHeapRSClosure::do_oop_nv(T* p) { 95 T heap_oop = oopDesc::load_heap_oop(p); 96 97 if (!oopDesc::is_null(heap_oop)) { 98 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 99 if (_g1->in_cset_fast_test(obj)) { 100 Prefetch::write(obj->mark_addr(), 0); 101 Prefetch::read(obj->mark_addr(), (HeapWordSize*2)); 102 103 // Place on the references queue 104 _par_scan_state->push_on_queue(p); 105 } 106 } 107 } 108 109 template <class T> 110 inline void G1CMOopClosure::do_oop_nv(T* p) { 111 assert(_g1h->is_in_g1_reserved((HeapWord*) p), "invariant"); 112 assert(!_g1h->is_on_master_free_list( 113 _g1h->heap_region_containing((HeapWord*) p)), "invariant"); 114 115 oop obj = oopDesc::load_decode_heap_oop(p); 116 if (_cm->verbose_high()) { 117 gclog_or_tty->print_cr("[%u] we're looking at location " 118 "*"PTR_FORMAT" = "PTR_FORMAT, 119 _task->worker_id(), p2i(p), p2i((void*) obj)); 120 } 121 _task->deal_with_reference(obj); 122 } 123 124 template <class T> 125 inline void G1RootRegionScanClosure::do_oop_nv(T* p) { 126 T heap_oop = oopDesc::load_heap_oop(p); 127 if (!oopDesc::is_null(heap_oop)) { 128 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 129 HeapRegion* hr = _g1h->heap_region_containing((HeapWord*) obj); 130 _cm->grayRoot(obj, obj->size(), _worker_id, hr); 131 } 132 } 133 134 template <class T> 135 inline void G1Mux2Closure::do_oop_nv(T* p) { 136 // Apply first closure; then apply the second. 137 _c1->do_oop(p); 138 _c2->do_oop(p); 139 } 140 141 template <class T> 142 inline void G1TriggerClosure::do_oop_nv(T* p) { 143 // Record that this closure was actually applied (triggered). 144 _triggered = true; 145 } 146 147 template <class T> 148 inline void G1InvokeIfNotTriggeredClosure::do_oop_nv(T* p) { 149 if (!_trigger_cl->triggered()) { 150 _oop_cl->do_oop(p); 151 } 152 } 153 154 template <class T> 155 inline void G1UpdateRSOrPushRefOopClosure::do_oop_nv(T* p) { 156 oop obj = oopDesc::load_decode_heap_oop(p); 157 if (obj == NULL) { 158 return; 159 } 160 161 #ifdef ASSERT 162 // can't do because of races 163 // assert(obj == NULL || obj->is_oop(), "expected an oop"); 164 165 // Do the safe subset of is_oop 166 #ifdef CHECK_UNHANDLED_OOPS 167 oopDesc* o = obj.obj(); 168 #else 169 oopDesc* o = obj; 170 #endif // CHECK_UNHANDLED_OOPS 171 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); 172 assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); 173 #endif // ASSERT 174 175 assert(_from != NULL, "from region must be non-NULL"); 176 assert(_from->is_in_reserved(p), "p is not in from"); 177 178 HeapRegion* to = _g1->heap_region_containing(obj); 179 if (_from == to) { 180 // Normally this closure should only be called with cross-region references. 181 // But since Java threads are manipulating the references concurrently and we 182 // reload the values things may have changed. 183 return; 184 } 185 186 // The _record_refs_into_cset flag is true during the RSet 187 // updating part of an evacuation pause. It is false at all 188 // other times: 189 // * rebuilding the remembered sets after a full GC 190 // * during concurrent refinement. 191 // * updating the remembered sets of regions in the collection 192 // set in the event of an evacuation failure (when deferred 193 // updates are enabled). 194 195 if (_record_refs_into_cset && to->in_collection_set()) { 196 // We are recording references that point into the collection 197 // set and this particular reference does exactly that... 198 // If the referenced object has already been forwarded 199 // to itself, we are handling an evacuation failure and 200 // we have already visited/tried to copy this object 201 // there is no need to retry. 202 if (!self_forwarded(obj)) { 203 assert(_push_ref_cl != NULL, "should not be null"); 204 // Push the reference in the refs queue of the G1ParScanThreadState 205 // instance for this worker thread. 206 _push_ref_cl->do_oop(p); 207 } 208 209 // Deferred updates to the CSet are either discarded (in the normal case), 210 // or processed (if an evacuation failure occurs) at the end 211 // of the collection. 212 // See G1RemSet::cleanup_after_oops_into_collection_set_do(). 213 } else { 214 // We either don't care about pushing references that point into the 215 // collection set (i.e. we're not during an evacuation pause) _or_ 216 // the reference doesn't point into the collection set. Either way 217 // we add the reference directly to the RSet of the region containing 218 // the referenced object. 219 assert(to->rem_set() != NULL, "Need per-region 'into' remsets."); 220 to->rem_set()->add_reference(p, _worker_i); 221 } 222 } 223 224 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP