1 /* 2 * Copyright (c) 2001, 2018, 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_G1_G1OOPCLOSURES_HPP 26 #define SHARE_VM_GC_G1_G1OOPCLOSURES_HPP 27 28 #include "gc/g1/g1InCSetState.hpp" 29 #include "memory/iterator.hpp" 30 #include "oops/markOop.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(InCSetState const state, 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 during the Update RS phase to refine remaining cards in the DCQ during garbage collection. 63 class G1ScanObjsDuringUpdateRSClosure : public G1ScanClosureBase { 64 public: 65 G1ScanObjsDuringUpdateRSClosure(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 the Scan RS phase to scan cards from the remembered set during garbage collection. 75 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase { 76 public: 77 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1h, 78 G1ParScanThreadState* par_scan_state): 79 G1ScanClosureBase(g1h, par_scan_state) { } 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 // Used during Optional RS scanning to make sure we trim the queues in a timely manner. 87 class G1ScanRSForOptionalClosure : public OopClosure { 88 G1ScanObjsDuringScanRSClosure* _scan_cl; 89 public: 90 G1ScanRSForOptionalClosure(G1ScanObjsDuringScanRSClosure* cl) : _scan_cl(cl) { } 91 92 template <class T> void do_oop_work(T* p); 93 virtual void do_oop(oop* p) { do_oop_work(p); } 94 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 95 }; 96 97 // This closure is applied to the fields of the objects that have just been copied during evacuation. 98 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase { 99 friend class G1ScanInYoungSetter; 100 101 enum ScanningInYoungValues { 102 False = 0, 103 True, 104 Uninitialized 105 }; 106 107 ScanningInYoungValues _scanning_in_young; 108 109 public: 110 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 111 G1ScanClosureBase(g1h, par_scan_state), _scanning_in_young(Uninitialized) { } 112 113 template <class T> void do_oop_work(T* p); 114 virtual void do_oop(oop* p) { do_oop_work(p); } 115 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 116 117 // We need to do reference discovery while processing evacuated objects. 118 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; } 119 120 void set_ref_discoverer(ReferenceDiscoverer* rd) { 121 set_ref_discoverer_internal(rd); 122 } 123 }; 124 125 // RAII object to properly set the _scanning_in_young field in G1ScanEvacuatedObjClosure. 126 class G1ScanInYoungSetter : public StackObj { 127 G1ScanEvacuatedObjClosure* _closure; 128 129 public: 130 G1ScanInYoungSetter(G1ScanEvacuatedObjClosure* closure, bool new_value) : _closure(closure) { 131 assert(_closure->_scanning_in_young == G1ScanEvacuatedObjClosure::Uninitialized, "Must not be set"); 132 _closure->_scanning_in_young = new_value ? G1ScanEvacuatedObjClosure::True : G1ScanEvacuatedObjClosure::False; 133 } 134 135 ~G1ScanInYoungSetter() { 136 DEBUG_ONLY(_closure->_scanning_in_young = G1ScanEvacuatedObjClosure::Uninitialized;) 137 } 138 }; 139 140 // Add back base class for metadata 141 class G1ParCopyHelper : public OopClosure { 142 protected: 143 G1CollectedHeap* _g1h; 144 G1ParScanThreadState* _par_scan_state; 145 uint _worker_id; // Cache value from par_scan_state. 146 ClassLoaderData* _scanned_cld; 147 G1ConcurrentMark* _cm; 148 149 // Mark the object if it's not already marked. This is used to mark 150 // objects pointed to by roots that are guaranteed not to move 151 // during the GC (i.e., non-CSet objects). It is MT-safe. 152 inline void mark_object(oop obj); 153 154 // Mark the object if it's not already marked. This is used to mark 155 // objects pointed to by roots that have been forwarded during a 156 // GC. It is MT-safe. 157 inline void mark_forwarded_object(oop from_obj, oop to_obj); 158 159 G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state); 160 ~G1ParCopyHelper() { } 161 162 public: 163 void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; } 164 inline void do_cld_barrier(oop new_obj); 165 166 inline void trim_queue_partially(); 167 }; 168 169 enum G1Barrier { 170 G1BarrierNone, 171 G1BarrierCLD 172 }; 173 174 enum G1Mark { 175 G1MarkNone, 176 G1MarkFromRoot, 177 G1MarkPromotedFromRoot 178 }; 179 180 template <G1Barrier barrier, G1Mark do_mark_object> 181 class G1ParCopyClosure : public G1ParCopyHelper { 182 public: 183 G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 184 G1ParCopyHelper(g1h, par_scan_state) { } 185 186 template <class T> void do_oop_work(T* p); 187 virtual void do_oop(oop* p) { do_oop_work(p); } 188 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 189 }; 190 191 class G1CLDScanClosure : public CLDClosure { 192 G1ParCopyHelper* _closure; 193 bool _process_only_dirty; 194 int _claim; 195 int _count; 196 public: 197 G1CLDScanClosure(G1ParCopyHelper* closure, 198 bool process_only_dirty, int claim_value) 199 : _closure(closure), _process_only_dirty(process_only_dirty), _claim(claim_value), _count(0) {} 200 void do_cld(ClassLoaderData* cld); 201 }; 202 203 // Closure for iterating over object fields during concurrent marking 204 class G1CMOopClosure : public MetadataVisitingOopIterateClosure { 205 G1CollectedHeap* _g1h; 206 G1CMTask* _task; 207 public: 208 G1CMOopClosure(G1CollectedHeap* g1h,G1CMTask* task); 209 template <class T> void do_oop_work(T* p); 210 virtual void do_oop( oop* p) { do_oop_work(p); } 211 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 212 }; 213 214 // Closure to scan the root regions during concurrent marking 215 class G1RootRegionScanClosure : public MetadataVisitingOopIterateClosure { 216 private: 217 G1CollectedHeap* _g1h; 218 G1ConcurrentMark* _cm; 219 uint _worker_id; 220 public: 221 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, uint worker_id) : 222 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 223 template <class T> void do_oop_work(T* p); 224 virtual void do_oop( oop* p) { do_oop_work(p); } 225 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 226 }; 227 228 class G1ConcurrentRefineOopClosure: public BasicOopIterateClosure { 229 G1CollectedHeap* _g1h; 230 uint _worker_i; 231 232 public: 233 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) : 234 _g1h(g1h), 235 _worker_i(worker_i) { 236 } 237 238 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 239 240 template <class T> void do_oop_work(T* p); 241 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 242 virtual void do_oop(oop* p) { do_oop_work(p); } 243 }; 244 245 class G1RebuildRemSetClosure : public BasicOopIterateClosure { 246 G1CollectedHeap* _g1h; 247 uint _worker_id; 248 public: 249 G1RebuildRemSetClosure(G1CollectedHeap* g1h, uint worker_id) : _g1h(g1h), _worker_id(worker_id) { 250 } 251 252 template <class T> void do_oop_work(T* p); 253 virtual void do_oop(oop* p) { do_oop_work(p); } 254 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 255 256 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 257 }; 258 259 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP