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