1 /* 2 * Copyright (c) 2001, 2016, 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 "memory/iterator.hpp" 29 #include "oops/markOop.hpp" 30 31 class HeapRegion; 32 class G1CollectedHeap; 33 class G1RemSet; 34 class G1ConcurrentMark; 35 class DirtyCardToOopClosure; 36 class G1CMBitMap; 37 class G1ParScanThreadState; 38 class G1CMTask; 39 class ReferenceProcessor; 40 41 // A class that scans oops in a given heap region (much as OopsInGenClosure 42 // scans oops in a generation.) 43 class OopsInHeapRegionClosure: public ExtendedOopClosure { 44 protected: 45 HeapRegion* _from; 46 public: 47 void set_region(HeapRegion* from) { _from = from; } 48 }; 49 50 class G1ParClosureSuper : public OopsInHeapRegionClosure { 51 protected: 52 G1CollectedHeap* _g1; 53 G1ParScanThreadState* _par_scan_state; 54 55 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 56 ~G1ParClosureSuper() { } 57 58 public: 59 virtual bool apply_to_weak_ref_discovered_field() { return true; } 60 }; 61 62 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 63 public: 64 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 65 G1ParScanThreadState* par_scan_state): 66 G1ParClosureSuper(g1, par_scan_state) { } 67 68 template <class T> void do_oop_nv(T* p); 69 virtual void do_oop(oop* p) { do_oop_nv(p); } 70 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 71 }; 72 73 class G1ParScanClosure : public G1ParClosureSuper { 74 public: 75 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 76 G1ParClosureSuper(g1, par_scan_state) { } 77 78 template <class T> void do_oop_nv(T* p); 79 virtual void do_oop(oop* p) { do_oop_nv(p); } 80 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 81 82 void set_ref_processor(ReferenceProcessor* rp) { 83 set_ref_processor_internal(rp); 84 } 85 }; 86 87 // Add back base class for metadata 88 class G1ParCopyHelper : public OopClosure { 89 protected: 90 G1CollectedHeap* _g1; 91 G1ParScanThreadState* _par_scan_state; 92 uint _worker_id; // Cache value from par_scan_state. 93 Klass* _scanned_klass; 94 G1ConcurrentMark* _cm; 95 96 // Mark the object if it's not already marked. This is used to mark 97 // objects pointed to by roots that are guaranteed not to move 98 // during the GC (i.e., non-CSet objects). It is MT-safe. 99 inline void mark_object(oop obj); 100 101 // Mark the object if it's not already marked. This is used to mark 102 // objects pointed to by roots that have been forwarded during a 103 // GC. It is MT-safe. 104 inline void mark_forwarded_object(oop from_obj, oop to_obj); 105 106 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 107 ~G1ParCopyHelper() { } 108 109 public: 110 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 111 template <class T> inline void do_klass_barrier(T* p, oop new_obj); 112 }; 113 114 enum G1Barrier { 115 G1BarrierNone, 116 G1BarrierKlass 117 }; 118 119 enum G1Mark { 120 G1MarkNone, 121 G1MarkFromRoot, 122 G1MarkPromotedFromRoot 123 }; 124 125 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext> 126 class G1ParCopyClosure : public G1ParCopyHelper { 127 public: 128 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 129 G1ParCopyHelper(g1, par_scan_state) { } 130 131 template <class T> void do_oop_work(T* p); 132 virtual void do_oop(oop* p) { do_oop_work(p); } 133 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 134 }; 135 136 class G1KlassScanClosure : public KlassClosure { 137 G1ParCopyHelper* _closure; 138 bool _process_only_dirty; 139 int _count; 140 public: 141 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) 142 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} 143 void do_klass(Klass* klass); 144 }; 145 146 class FilterIntoCSClosure: public OopClosure { 147 G1CollectedHeap* _g1; 148 OopClosure* _oc; 149 public: 150 FilterIntoCSClosure(G1CollectedHeap* g1, OopClosure* oc) : _g1(g1), _oc(oc) { } 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 FilterOutOfRegionClosure: public ExtendedOopClosure { 158 HeapWord* _r_bottom; 159 HeapWord* _r_end; 160 OopClosure* _oc; 161 public: 162 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 163 template <class T> void do_oop_nv(T* p); 164 virtual void do_oop(oop* p) { do_oop_nv(p); } 165 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 166 bool apply_to_weak_ref_discovered_field() { return true; } 167 }; 168 169 // Closure for iterating over object fields during concurrent marking 170 class G1CMOopClosure : public MetadataAwareOopClosure { 171 protected: 172 G1ConcurrentMark* _cm; 173 private: 174 G1CollectedHeap* _g1h; 175 G1CMTask* _task; 176 public: 177 G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task); 178 template <class T> void do_oop_nv(T* p); 179 virtual void do_oop( oop* p) { do_oop_nv(p); } 180 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 181 }; 182 183 // Closure to scan the root regions during concurrent marking 184 class G1RootRegionScanClosure : public MetadataAwareOopClosure { 185 private: 186 G1CollectedHeap* _g1h; 187 G1ConcurrentMark* _cm; 188 public: 189 G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) : 190 _g1h(g1h), _cm(cm) { } 191 template <class T> void do_oop_nv(T* p); 192 virtual void do_oop( oop* p) { do_oop_nv(p); } 193 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 194 }; 195 196 // Closure that applies the given two closures in sequence. 197 // Used by the RSet refinement code (when updating RSets 198 // during an evacuation pause) to record cards containing 199 // pointers into the collection set. 200 201 class G1Mux2Closure : public OopClosure { 202 OopClosure* _c1; 203 OopClosure* _c2; 204 public: 205 G1Mux2Closure(OopClosure *c1, OopClosure *c2); 206 template <class T> inline void do_oop_work(T* p); 207 virtual inline void do_oop(oop* p); 208 virtual inline void do_oop(narrowOop* p); 209 }; 210 211 // A closure that returns true if it is actually applied 212 // to a reference 213 214 class G1TriggerClosure : public OopClosure { 215 bool _triggered; 216 public: 217 G1TriggerClosure(); 218 bool triggered() const { return _triggered; } 219 template <class T> inline void do_oop_work(T* p); 220 virtual inline void do_oop(oop* p); 221 virtual inline void do_oop(narrowOop* p); 222 }; 223 224 // A closure which uses a triggering closure to determine 225 // whether to apply an oop closure. 226 227 class G1InvokeIfNotTriggeredClosure: public OopClosure { 228 G1TriggerClosure* _trigger_cl; 229 OopClosure* _oop_cl; 230 public: 231 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); 232 template <class T> inline void do_oop_work(T* p); 233 virtual inline void do_oop(oop* p); 234 virtual inline void do_oop(narrowOop* p); 235 }; 236 237 class G1UpdateRSOrPushRefOopClosure: public OopClosure { 238 G1CollectedHeap* _g1; 239 G1RemSet* _g1_rem_set; 240 HeapRegion* _from; 241 G1ParPushHeapRSClosure* _push_ref_cl; 242 bool _record_refs_into_cset; 243 uint _worker_i; 244 245 public: 246 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 247 G1RemSet* rs, 248 G1ParPushHeapRSClosure* push_ref_cl, 249 bool record_refs_into_cset, 250 uint worker_i = 0); 251 252 void set_from(HeapRegion* from) { 253 assert(from != NULL, "from region must be non-NULL"); 254 _from = from; 255 } 256 257 bool self_forwarded(oop obj) { 258 markOop m = obj->mark(); 259 bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj)); 260 return result; 261 } 262 263 template <class T> inline void do_oop_work(T* p); 264 virtual inline void do_oop(narrowOop* p); 265 virtual inline void do_oop(oop* p); 266 }; 267 268 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP