1 /* 2 * Copyright (c) 2001, 2014, 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_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP 27 28 class HeapRegion; 29 class G1CollectedHeap; 30 class G1RemSet; 31 class ConcurrentMark; 32 class DirtyCardToOopClosure; 33 class CMBitMap; 34 class CMMarkStack; 35 class G1ParScanThreadState; 36 class CMTask; 37 class ReferenceProcessor; 38 39 // A class that scans oops in a given heap region (much as OopsInGenClosure 40 // scans oops in a generation.) 41 class OopsInHeapRegionClosure: public ExtendedOopClosure { 42 protected: 43 HeapRegion* _from; 44 public: 45 void set_region(HeapRegion* from) { _from = from; } 46 }; 47 48 class G1ParClosureSuper : public OopsInHeapRegionClosure { 49 protected: 50 G1CollectedHeap* _g1; 51 G1ParScanThreadState* _par_scan_state; 52 uint _worker_id; 53 54 public: 55 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 56 bool apply_to_weak_ref_discovered_field() { return true; } 57 }; 58 59 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 60 public: 61 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 62 G1ParScanThreadState* par_scan_state): 63 G1ParClosureSuper(g1, par_scan_state) { } 64 65 template <class T> void do_oop_nv(T* p); 66 virtual void do_oop(oop* p) { do_oop_nv(p); } 67 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 68 }; 69 70 class G1ParScanClosure : public G1ParClosureSuper { 71 public: 72 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : 73 G1ParClosureSuper(g1, par_scan_state) 74 { 75 assert(_ref_processor == NULL, "sanity"); 76 _ref_processor = rp; 77 } 78 79 template <class T> void do_oop_nv(T* p); 80 virtual void do_oop(oop* p) { do_oop_nv(p); } 81 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 82 }; 83 84 // Add back base class for metadata 85 class G1ParCopyHelper : public G1ParClosureSuper { 86 private: 87 Klass* _scanned_klass; 88 ConcurrentMark* _cm; 89 protected: 90 // Mark the object if it's not already marked. This is used to mark 91 // objects pointed to by roots that are guaranteed not to move 92 // during the GC (i.e., non-CSet objects). It is MT-safe. 93 void mark_object(oop obj); 94 95 // Mark the object if it's not already marked. This is used to mark 96 // objects pointed to by roots that have been forwarded during a 97 // GC. It is MT-safe. 98 void mark_forwarded_object(oop from_obj, oop to_obj); 99 100 public: 101 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 102 103 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 104 template <class T> void do_klass_barrier(T* p, oop new_obj); 105 }; 106 107 template <G1Barrier barrier, bool do_mark_object> 108 class G1ParCopyClosure : public G1ParCopyHelper { 109 template <class T> void do_oop_work(T* p); 110 111 public: 112 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, 113 ReferenceProcessor* rp) : G1ParCopyHelper(g1, par_scan_state) { 114 assert(_ref_processor == NULL, "sanity"); 115 } 116 117 template <class T> void do_oop_nv(T* p) { 118 do_oop_work(p); 119 } 120 virtual void do_oop(oop* p) { do_oop_nv(p); } 121 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 122 }; 123 124 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure; 125 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure; 126 127 128 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; 129 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure; 130 131 // The following closure type is defined in g1_specialized_oop_closures.hpp: 132 // 133 // typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacClosure; 134 135 // We use a separate closure to handle references during evacuation 136 // failure processing. 137 // We could have used another instance of G1ParScanHeapEvacClosure 138 // (since that closure no longer assumes that the references it 139 // handles point into the collection set). 140 141 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; 142 143 class FilterIntoCSClosure: public ExtendedOopClosure { 144 G1CollectedHeap* _g1; 145 OopClosure* _oc; 146 DirtyCardToOopClosure* _dcto_cl; 147 public: 148 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, 149 G1CollectedHeap* g1, 150 OopClosure* oc) : 151 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } 152 153 template <class T> void do_oop_nv(T* p); 154 virtual void do_oop(oop* p) { do_oop_nv(p); } 155 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 156 bool apply_to_weak_ref_discovered_field() { return true; } 157 }; 158 159 class FilterOutOfRegionClosure: public ExtendedOopClosure { 160 HeapWord* _r_bottom; 161 HeapWord* _r_end; 162 OopClosure* _oc; 163 public: 164 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 165 template <class T> void do_oop_nv(T* p); 166 virtual void do_oop(oop* p) { do_oop_nv(p); } 167 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 168 bool apply_to_weak_ref_discovered_field() { return true; } 169 }; 170 171 // Closure for iterating over object fields during concurrent marking 172 class G1CMOopClosure : public ExtendedOopClosure { 173 private: 174 G1CollectedHeap* _g1h; 175 ConcurrentMark* _cm; 176 CMTask* _task; 177 public: 178 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); 179 template <class T> void do_oop_nv(T* p); 180 virtual void do_oop( oop* p) { do_oop_nv(p); } 181 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 182 }; 183 184 // Closure to scan the root regions during concurrent marking 185 class G1RootRegionScanClosure : public ExtendedOopClosure { 186 private: 187 G1CollectedHeap* _g1h; 188 ConcurrentMark* _cm; 189 uint _worker_id; 190 public: 191 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, 192 uint worker_id) : 193 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 194 template <class T> void do_oop_nv(T* p); 195 virtual void do_oop( oop* p) { do_oop_nv(p); } 196 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 197 }; 198 199 // Closure that applies the given two closures in sequence. 200 // Used by the RSet refinement code (when updating RSets 201 // during an evacuation pause) to record cards containing 202 // pointers into the collection set. 203 204 class G1Mux2Closure : public ExtendedOopClosure { 205 OopClosure* _c1; 206 OopClosure* _c2; 207 public: 208 G1Mux2Closure(OopClosure *c1, OopClosure *c2); 209 template <class T> void do_oop_nv(T* p); 210 virtual void do_oop(oop* p) { do_oop_nv(p); } 211 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 212 }; 213 214 // A closure that returns true if it is actually applied 215 // to a reference 216 217 class G1TriggerClosure : public ExtendedOopClosure { 218 bool _triggered; 219 public: 220 G1TriggerClosure(); 221 bool triggered() const { return _triggered; } 222 template <class T> void do_oop_nv(T* p); 223 virtual void do_oop(oop* p) { do_oop_nv(p); } 224 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 225 }; 226 227 // A closure which uses a triggering closure to determine 228 // whether to apply an oop closure. 229 230 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure { 231 G1TriggerClosure* _trigger_cl; 232 OopClosure* _oop_cl; 233 public: 234 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); 235 template <class T> void do_oop_nv(T* p); 236 virtual void do_oop(oop* p) { do_oop_nv(p); } 237 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 238 }; 239 240 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { 241 G1CollectedHeap* _g1; 242 G1RemSet* _g1_rem_set; 243 HeapRegion* _from; 244 OopsInHeapRegionClosure* _push_ref_cl; 245 bool _record_refs_into_cset; 246 int _worker_i; 247 248 public: 249 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 250 G1RemSet* rs, 251 OopsInHeapRegionClosure* push_ref_cl, 252 bool record_refs_into_cset, 253 int worker_i = 0); 254 255 void set_from(HeapRegion* from) { 256 assert(from != NULL, "from region must be non-NULL"); 257 _from = from; 258 } 259 260 bool self_forwarded(oop obj) { 261 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); 262 return result; 263 } 264 265 bool apply_to_weak_ref_discovered_field() { return true; } 266 267 template <class T> void do_oop_nv(T* p); 268 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 269 virtual void do_oop(oop* p) { do_oop_nv(p); } 270 }; 271 272 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP