1 /* 2 * Copyright (c) 2001, 2017, 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 ExtendedOopClosure { 43 protected: 44 G1CollectedHeap* _g1; 45 G1ParScanThreadState* _par_scan_state; 46 HeapRegion* _from; 47 48 G1ScanClosureBase(G1CollectedHeap* g1, 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 // This closure needs special handling for InstanceRefKlass. 58 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; } 59 void set_region(HeapRegion* from) { _from = from; } 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 uint _worker_i; 65 66 public: 67 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h, 68 G1ParScanThreadState* pss, 69 uint worker_i) : 70 G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { } 71 72 template <class T> void do_oop_nv(T* p); 73 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 74 virtual void do_oop(oop* p) { do_oop_nv(p); } 75 }; 76 77 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection. 78 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase { 79 public: 80 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1, 81 G1ParScanThreadState* par_scan_state): 82 G1ScanClosureBase(g1, par_scan_state) { } 83 84 template <class T> void do_oop_nv(T* p); 85 virtual void do_oop(oop* p) { do_oop_nv(p); } 86 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 87 }; 88 89 // This closure is applied to the fields of the objects that have just been copied during evacuation. 90 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase { 91 public: 92 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 93 G1ScanClosureBase(g1, par_scan_state) { } 94 95 template <class T> void do_oop_nv(T* p); 96 virtual void do_oop(oop* p) { do_oop_nv(p); } 97 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 98 99 void set_ref_processor(ReferenceProcessor* rp) { 100 set_ref_processor_internal(rp); 101 } 102 }; 103 104 // Add back base class for metadata 105 class G1ParCopyHelper : public OopClosure { 106 protected: 107 G1CollectedHeap* _g1; 108 G1ParScanThreadState* _par_scan_state; 109 uint _worker_id; // Cache value from par_scan_state. 110 Klass* _scanned_klass; 111 G1ConcurrentMark* _cm; 112 113 // Mark the object if it's not already marked. This is used to mark 114 // objects pointed to by roots that are guaranteed not to move 115 // during the GC (i.e., non-CSet objects). It is MT-safe. 116 inline void mark_object(oop obj); 117 118 // Mark the object if it's not already marked. This is used to mark 119 // objects pointed to by roots that have been forwarded during a 120 // GC. It is MT-safe. 121 inline void mark_forwarded_object(oop from_obj, oop to_obj); 122 123 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 124 ~G1ParCopyHelper() { } 125 126 public: 127 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 128 template <class T> inline void do_klass_barrier(T* p, oop new_obj); 129 }; 130 131 enum G1Barrier { 132 G1BarrierNone, 133 G1BarrierKlass 134 }; 135 136 enum G1Mark { 137 G1MarkNone, 138 G1MarkFromRoot, 139 G1MarkPromotedFromRoot 140 }; 141 142 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext> 143 class G1ParCopyClosure : public G1ParCopyHelper { 144 public: 145 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 146 G1ParCopyHelper(g1, par_scan_state) { } 147 148 template <class T> void do_oop_work(T* p); 149 virtual void do_oop(oop* p) { do_oop_work(p); } 150 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 151 }; 152 153 class G1KlassScanClosure : public KlassClosure { 154 G1ParCopyHelper* _closure; 155 bool _process_only_dirty; 156 int _count; 157 public: 158 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) 159 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} 160 void do_klass(Klass* klass); 161 }; 162 163 // Closure for iterating over object fields during concurrent marking 164 class G1CMOopClosure : public MetadataAwareOopClosure { 165 protected: 166 G1ConcurrentMark* _cm; 167 private: 168 G1CollectedHeap* _g1h; 169 G1CMTask* _task; 170 public: 171 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task); 172 template <class T> void do_oop_nv(T* p); 173 virtual void do_oop( oop* p) { do_oop_nv(p); } 174 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 175 }; 176 177 // Closure to scan the root regions during concurrent marking 178 class G1RootRegionScanClosure : public MetadataAwareOopClosure { 179 private: 180 G1CollectedHeap* _g1h; 181 G1ConcurrentMark* _cm; 182 public: 183 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) : 184 _g1h(g1h), _cm(cm) { } 185 template <class T> void do_oop_nv(T* p); 186 virtual void do_oop( oop* p) { do_oop_nv(p); } 187 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 188 }; 189 190 class G1ConcurrentRefineOopClosure: public ExtendedOopClosure { 191 G1CollectedHeap* _g1; 192 uint _worker_i; 193 194 public: 195 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) : 196 _g1(g1h), 197 _worker_i(worker_i) { 198 } 199 200 // This closure needs special handling for InstanceRefKlass. 201 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; } 202 203 template <class T> void do_oop_nv(T* p); 204 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 205 virtual void do_oop(oop* p) { do_oop_nv(p); } 206 }; 207 208 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP