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 bool _has_refs_into_cset; 66 67 public: 68 G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h, 69 G1ParScanThreadState* pss, 70 uint worker_i) : 71 G1ScanClosureBase(g1h, pss), _has_refs_into_cset(false), _worker_i(worker_i) { } 72 73 void reset_has_refs_into_cset() { _has_refs_into_cset = false; } 74 bool has_refs_into_cset() const { return _has_refs_into_cset; } 75 76 template <class T> void do_oop_nv(T* p); 77 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 78 virtual void do_oop(oop* p) { do_oop_nv(p); } 79 }; 80 81 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection. 82 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase { 83 public: 84 G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1, 85 G1ParScanThreadState* par_scan_state): 86 G1ScanClosureBase(g1, par_scan_state) { } 87 88 template <class T> void do_oop_nv(T* p); 89 virtual void do_oop(oop* p) { do_oop_nv(p); } 90 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 91 }; 92 93 // This closure is applied to the fields of the objects that have just been copied during evacuation. 94 class G1ScanEvacuatedObjClosure : public G1ScanClosureBase { 95 public: 96 G1ScanEvacuatedObjClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 97 G1ScanClosureBase(g1, par_scan_state) { } 98 99 template <class T> void do_oop_nv(T* p); 100 virtual void do_oop(oop* p) { do_oop_nv(p); } 101 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 102 103 void set_ref_processor(ReferenceProcessor* rp) { 104 set_ref_processor_internal(rp); 105 } 106 }; 107 108 // Add back base class for metadata 109 class G1ParCopyHelper : public OopClosure { 110 protected: 111 G1CollectedHeap* _g1; 112 G1ParScanThreadState* _par_scan_state; 113 uint _worker_id; // Cache value from par_scan_state. 114 Klass* _scanned_klass; 115 G1ConcurrentMark* _cm; 116 117 // Mark the object if it's not already marked. This is used to mark 118 // objects pointed to by roots that are guaranteed not to move 119 // during the GC (i.e., non-CSet objects). It is MT-safe. 120 inline void mark_object(oop obj); 121 122 // Mark the object if it's not already marked. This is used to mark 123 // objects pointed to by roots that have been forwarded during a 124 // GC. It is MT-safe. 125 inline void mark_forwarded_object(oop from_obj, oop to_obj); 126 127 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 128 ~G1ParCopyHelper() { } 129 130 public: 131 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 132 template <class T> inline void do_klass_barrier(T* p, oop new_obj); 133 }; 134 135 enum G1Barrier { 136 G1BarrierNone, 137 G1BarrierKlass 138 }; 139 140 enum G1Mark { 141 G1MarkNone, 142 G1MarkFromRoot, 143 G1MarkPromotedFromRoot 144 }; 145 146 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext> 147 class G1ParCopyClosure : public G1ParCopyHelper { 148 public: 149 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 150 G1ParCopyHelper(g1, par_scan_state) { } 151 152 template <class T> void do_oop_work(T* p); 153 virtual void do_oop(oop* p) { do_oop_work(p); } 154 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 155 }; 156 157 class G1KlassScanClosure : public KlassClosure { 158 G1ParCopyHelper* _closure; 159 bool _process_only_dirty; 160 int _count; 161 public: 162 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) 163 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} 164 void do_klass(Klass* klass); 165 }; 166 167 // Closure for iterating over object fields during concurrent marking 168 class G1CMOopClosure : public MetadataAwareOopClosure { 169 protected: 170 G1ConcurrentMark* _cm; 171 private: 172 G1CollectedHeap* _g1h; 173 G1CMTask* _task; 174 public: 175 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task); 176 template <class T> void do_oop_nv(T* p); 177 virtual void do_oop( oop* p) { do_oop_nv(p); } 178 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 179 }; 180 181 // Closure to scan the root regions during concurrent marking 182 class G1RootRegionScanClosure : public MetadataAwareOopClosure { 183 private: 184 G1CollectedHeap* _g1h; 185 G1ConcurrentMark* _cm; 186 public: 187 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) : 188 _g1h(g1h), _cm(cm) { } 189 template <class T> void do_oop_nv(T* p); 190 virtual void do_oop( oop* p) { do_oop_nv(p); } 191 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 192 }; 193 194 class G1ConcurrentRefineOopClosure: public ExtendedOopClosure { 195 G1CollectedHeap* _g1; 196 uint _worker_i; 197 198 public: 199 G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) : 200 _g1(g1h), 201 _worker_i(worker_i) { 202 } 203 204 // This closure needs special handling for InstanceRefKlass. 205 virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; } 206 207 template <class T> void do_oop_nv(T* p); 208 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 209 virtual void do_oop(oop* p) { do_oop_nv(p); } 210 }; 211 212 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP