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 G1CMTask; 40 class ReferenceProcessor; 41 42 class G1ScanClosureBase : public BasicOopIterateClosure { 43 protected: 44 G1CollectedHeap* _g1h; 45 G1ParScanThreadState* _par_scan_state; 46 HeapRegion* _from; 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 void set_region(HeapRegion* from) { _from = from; } 60 61 inline void trim_queue_partially(); 62 }; 63 64 // Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection. 65 class G1ScanObjsDuringUpdateRSClosure: public G1ScanClosureBase { 66 uint _worker_i; 67 68 public: 69 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h, 70 G1ParScanThreadState* pss, 71 uint worker_i) : 72 G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { } 73 74 template <class T> void do_oop_work(T* p); 75 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 76 virtual void do_oop(oop* p) { do_oop_work(p); } 77 }; 78 79 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection. 80 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase { 81 public: 82 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1h, 83 G1ParScanThreadState* par_scan_state): 84 G1ScanClosureBase(g1h, par_scan_state) { } 85 86 template <class T> void do_oop_work(T* p); 87 virtual void do_oop(oop* p) { do_oop_work(p); } 88 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 89 }; 90 91 // This closure is applied to the fields of the objects that have just been copied during evacuation. 92 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase { 93 public: 94 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 95 G1ScanClosureBase(g1h, par_scan_state) { } 96 97 template <class T> void do_oop_work(T* p); 98 virtual void do_oop(oop* p) { do_oop_work(p); } 99 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 100 101 // We need to do reference discovery while processing evacuated objects. 102 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; } 103 104 void set_ref_discoverer(ReferenceDiscoverer* rd) { 105 set_ref_discoverer_internal(rd); 106 } 107 }; 108 109 // Add back base class for metadata 110 class G1ParCopyHelper : public OopClosure { 111 protected: 112 G1CollectedHeap* _g1h; 113 G1ParScanThreadState* _par_scan_state; 114 uint _worker_id; // Cache value from par_scan_state. 115 ClassLoaderData* _scanned_cld; 116 G1ConcurrentMark* _cm; 117 118 // Mark the object if it's not already marked. This is used to mark 119 // objects pointed to by roots that are guaranteed not to move 120 // during the GC (i.e., non-CSet objects). It is MT-safe. 121 inline void mark_object(oop obj); 122 123 // Mark the object if it's not already marked. This is used to mark 124 // objects pointed to by roots that have been forwarded during a 125 // GC. It is MT-safe. 126 inline void mark_forwarded_object(oop from_obj, oop to_obj); 127 128 G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state); 129 ~G1ParCopyHelper() { } 130 131 public: 132 void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; } 133 inline void do_cld_barrier(oop new_obj); 134 135 inline void trim_queue_partially(); 136 }; 137 138 enum G1Barrier { 139 G1BarrierNone, 140 G1BarrierCLD 141 }; 142 143 enum G1Mark { 144 G1MarkNone, 145 G1MarkFromRoot, 146 G1MarkPromotedFromRoot 147 }; 148 149 template <G1Barrier barrier, G1Mark do_mark_object> 150 class G1ParCopyClosure : public G1ParCopyHelper { 151 public: 152 G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) : 153 G1ParCopyHelper(g1h, par_scan_state) { } 154 155 template <class T> void do_oop_work(T* p); 156 virtual void do_oop(oop* p) { do_oop_work(p); } 157 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 158 }; 159 160 class G1CLDScanClosure : public CLDClosure { 161 G1ParCopyHelper* _closure; 162 bool _process_only_dirty; 163 int _claim; 164 int _count; 165 public: 166 G1CLDScanClosure(G1ParCopyHelper* closure, 167 bool process_only_dirty, int claim_value) 168 : _closure(closure), _process_only_dirty(process_only_dirty), _claim(claim_value), _count(0) {} 169 void do_cld(ClassLoaderData* cld); 170 }; 171 172 // Closure for iterating over object fields during concurrent marking 173 class G1CMOopClosure : public MetadataVisitingOopIterateClosure { 174 G1CollectedHeap* _g1h; 175 G1CMTask* _task; 176 public: 177 G1CMOopClosure(G1CollectedHeap* g1h,G1CMTask* task); 178 template <class T> void do_oop_work(T* p); 179 virtual void do_oop( oop* p) { do_oop_work(p); } 180 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 181 }; 182 183 // Closure to scan the root regions during concurrent marking 184 class G1RootRegionScanClosure : public MetadataVisitingOopIterateClosure { 185 private: 186 G1CollectedHeap* _g1h; 187 G1ConcurrentMark* _cm; 188 uint _worker_id; 189 public: 190 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, uint worker_id) : 191 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 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 class G1ConcurrentRefineOopClosure: public BasicOopIterateClosure { 198 G1CollectedHeap* _g1h; 199 uint _worker_i; 200 201 public: 202 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) : 203 _g1h(g1h), 204 _worker_i(worker_i) { 205 } 206 207 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 208 209 template <class T> void do_oop_work(T* p); 210 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 211 virtual void do_oop(oop* p) { do_oop_work(p); } 212 }; 213 214 class G1RebuildRemSetClosure : public BasicOopIterateClosure { 215 G1CollectedHeap* _g1h; 216 uint _worker_id; 217 public: 218 G1RebuildRemSetClosure(G1CollectedHeap* g1h, uint worker_id) : _g1h(g1h), _worker_id(worker_id) { 219 } 220 221 template <class T> void do_oop_work(T* p); 222 virtual void do_oop(oop* p) { do_oop_work(p); } 223 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 224 225 virtual ReferenceIterationMode reference_iteration_mode() { return DO_FIELDS; } 226 }; 227 228 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP