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