1 /* 2 * Copyright (c) 2001, 2019, 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_GC_G1_G1OOPCLOSURES_HPP 26 #define SHARE_GC_G1_G1OOPCLOSURES_HPP 27 28 #include "gc/g1/g1HeapRegionAttr.hpp" 29 #include "memory/iterator.hpp" 30 #include "oops/markWord.hpp" 31 32 class HeapRegion; 33 class G1CollectedHeap; 34 class G1RemSet; 35 class G1ConcurrentMark; 36 class DirtyCardToOopClosure; 37 class G1CMBitMap; 38 class G1ParScanThreadState; 39 class G1ScanEvacuatedObjClosure; 40 class G1CMTask; 41 class ReferenceProcessor; 42 43 class G1ScanClosureBase : public BasicOopIterateClosure { 44 protected: 45 G1CollectedHeap* _g1h; 46 G1ParScanThreadState* _par_scan_state; 47 48 G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state); 49 ~G1ScanClosureBase() { } 50 51 template <class T> 52 inline void prefetch_and_push(T* p, oop const obj); 53 54 template <class T> 55 inline void handle_non_cset_obj_common(G1HeapRegionAttr const region_attr, T* p, oop const obj); 56 public: 57 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 58 59 inline void trim_queue_partially(); 60 }; 61 62 // Used to scan cards from the DCQS or the remembered sets during garbage collection. 63 class G1ScanCardClosure : public G1ScanClosureBase { 64 public: 65 G1ScanCardClosure(G1CollectedHeap* g1h, 66 G1ParScanThreadState* pss) : 67 G1ScanClosureBase(g1h, pss) { } 68 69 template <class T> void do_oop_work(T* p); 70 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 71 virtual void do_oop(oop* p) { do_oop_work(p); } 72 }; 73 74 // Used during Optional RS scanning to make sure we trim the queues in a timely manner. 75 class G1ScanRSForOptionalClosure : public OopClosure { 76 G1CollectedHeap* _g1h; 77 G1ScanCardClosure* _scan_cl; 78 public: 79 G1ScanRSForOptionalClosure(G1CollectedHeap* g1h, G1ScanCardClosure* cl) : _g1h(g1h), _scan_cl(cl) { } 80 81 template <class T> void do_oop_work(T* p); 82 virtual void do_oop(oop* p) { do_oop_work(p); } 83 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 84 }; 85 86 // This closure is applied to the fields of the objects that have just been copied during evacuation. 87 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase { 88 friend class G1ScanInYoungSetter; 89 90 enum ScanningInYoungValues { 91 False = 0, 92 True, 93 Uninitialized 94 }; 95 96 ScanningInYoungValues _scanning_in_young; 97 98 public: 99 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 100 G1ScanClosureBase(g1h, par_scan_state), _scanning_in_young(Uninitialized) { } 101 102 template <class T> void do_oop_work(T* p); 103 virtual void do_oop(oop* p) { do_oop_work(p); } 104 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 105 106 // We need to do reference discovery while processing evacuated objects. 107 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; } 108 109 void set_ref_discoverer(ReferenceDiscoverer* rd) { 110 set_ref_discoverer_internal(rd); 111 } 112 }; 113 114 // RAII object to properly set the _scanning_in_young field in G1ScanEvacuatedObjClosure. 115 class G1ScanInYoungSetter : public StackObj { 116 G1ScanEvacuatedObjClosure* _closure; 117 118 public: 119 G1ScanInYoungSetter(G1ScanEvacuatedObjClosure* closure, bool new_value) : _closure(closure) { 120 assert(_closure->_scanning_in_young == G1ScanEvacuatedObjClosure::Uninitialized, "Must not be set"); 121 _closure->_scanning_in_young = new_value ? G1ScanEvacuatedObjClosure::True : G1ScanEvacuatedObjClosure::False; 122 } 123 124 ~G1ScanInYoungSetter() { 125 DEBUG_ONLY(_closure->_scanning_in_young = G1ScanEvacuatedObjClosure::Uninitialized;) 126 } 127 }; 128 129 // Add back base class for metadata 130 class G1ParCopyHelper : public OopClosure { 131 protected: 132 G1CollectedHeap* _g1h; 133 G1ParScanThreadState* _par_scan_state; 134 uint _worker_id; // Cache value from par_scan_state. 135 ClassLoaderData* _scanned_cld; 136 G1ConcurrentMark* _cm; 137 138 // Mark the object if it's not already marked. This is used to mark 139 // objects pointed to by roots that are guaranteed not to move 140 // during the GC (i.e., non-CSet objects). It is MT-safe. 141 inline void mark_object(oop obj); 142 143 G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state); 144 ~G1ParCopyHelper() { } 145 146 public: 147 void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; } 148 inline void do_cld_barrier(oop new_obj); 149 150 inline void trim_queue_partially(); 151 }; 152 153 enum G1Barrier { 154 G1BarrierNone, 155 G1BarrierCLD, 156 G1BarrierNoOptRoots // Do not collect optional roots. 157 }; 158 159 enum G1Mark { 160 G1MarkNone, 161 G1MarkFromRoot, 162 G1MarkPromotedFromRoot 163 }; 164 165 template <G1Barrier barrier, G1Mark do_mark_object> 166 class G1ParCopyClosure : public G1ParCopyHelper { 167 public: 168 G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 169 G1ParCopyHelper(g1h, par_scan_state) { } 170 171 template <class T> void do_oop_work(T* p); 172 virtual void do_oop(oop* p) { do_oop_work(p); } 173 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 174 }; 175 176 class G1CLDScanClosure : public CLDClosure { 177 G1ParCopyHelper* _closure; 178 bool _process_only_dirty; 179 int _count; 180 public: 181 G1CLDScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) 182 : _closure(closure), _process_only_dirty(process_only_dirty), _count(0) {} 183 void do_cld(ClassLoaderData* cld); 184 }; 185 186 // Closure for iterating over object fields during concurrent marking 187 class G1CMOopClosure : public MetadataVisitingOopIterateClosure { 188 G1CollectedHeap* _g1h; 189 G1CMTask* _task; 190 public: 191 G1CMOopClosure(G1CollectedHeap* g1h,G1CMTask* task); 192 template <class T> void do_oop_work(T* p); 193 virtual void do_oop( oop* p) { do_oop_work(p); } 194 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 195 }; 196 197 // Closure to scan the root regions during concurrent marking 198 class G1RootRegionScanClosure : public MetadataVisitingOopIterateClosure { 199 private: 200 G1CollectedHeap* _g1h; 201 G1ConcurrentMark* _cm; 202 uint _worker_id; 203 public: 204 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, uint worker_id) : 205 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 206 template <class T> void do_oop_work(T* p); 207 virtual void do_oop( oop* p) { do_oop_work(p); } 208 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 209 }; 210 211 class G1ConcurrentRefineOopClosure: public BasicOopIterateClosure { 212 G1CollectedHeap* _g1h; 213 uint _worker_id; 214 215 public: 216 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_id) : 217 _g1h(g1h), 218 _worker_id(worker_id) { 219 } 220 221 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 222 223 template <class T> void do_oop_work(T* p); 224 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 225 virtual void do_oop(oop* p) { do_oop_work(p); } 226 }; 227 228 class G1RebuildRemSetClosure : public BasicOopIterateClosure { 229 G1CollectedHeap* _g1h; 230 uint _worker_id; 231 public: 232 G1RebuildRemSetClosure(G1CollectedHeap* g1h, uint worker_id) : _g1h(g1h), _worker_id(worker_id) { 233 } 234 235 template <class T> void do_oop_work(T* p); 236 virtual void do_oop(oop* p) { do_oop_work(p); } 237 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 238 239 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 240 }; 241 242 #endif // SHARE_GC_G1_G1OOPCLOSURES_HPP