1 /* 2 * Copyright (c) 2001, 2015, 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 ConcurrentMark; 35 class DirtyCardToOopClosure; 36 class CMBitMap; 37 class CMMarkStack; 38 class G1ParScanThreadState; 39 class CMTask; 40 class ReferenceProcessor; 41 42 // A class that scans oops in a given heap region (much as OopsInGenClosure 43 // scans oops in a generation.) 44 class OopsInHeapRegionClosure: public ExtendedOopClosure { 45 protected: 46 HeapRegion* _from; 47 public: 48 void set_region(HeapRegion* from) { _from = from; } 49 }; 50 51 class G1ParClosureSuper : public OopsInHeapRegionClosure { 52 protected: 53 G1CollectedHeap* _g1; 54 G1ParScanThreadState* _par_scan_state; 55 uint _worker_id; 56 public: 57 // Initializes the instance, leaving _par_scan_state uninitialized. Must be done 58 // later using the set_par_scan_thread_state() method. 59 G1ParClosureSuper(G1CollectedHeap* g1); 60 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 61 bool apply_to_weak_ref_discovered_field() { return true; } 62 63 void set_par_scan_thread_state(G1ParScanThreadState* par_scan_state); 64 }; 65 66 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 67 public: 68 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 69 G1ParScanThreadState* par_scan_state): 70 G1ParClosureSuper(g1, par_scan_state) { } 71 72 template <class T> void do_oop_nv(T* p); 73 virtual void do_oop(oop* p) { do_oop_nv(p); } 74 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 75 }; 76 77 class G1ParScanClosure : public G1ParClosureSuper { 78 public: 79 G1ParScanClosure(G1CollectedHeap* g1) : G1ParClosureSuper(g1) { } 80 81 template <class T> void do_oop_nv(T* p); 82 virtual void do_oop(oop* p) { do_oop_nv(p); } 83 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 84 85 void set_ref_processor(ReferenceProcessor* ref_processor) { _ref_processor = ref_processor; } 86 }; 87 88 // Add back base class for metadata 89 class G1ParCopyHelper : public G1ParClosureSuper { 90 protected: 91 Klass* _scanned_klass; 92 ConcurrentMark* _cm; 93 94 // Mark the object if it's not already marked. This is used to mark 95 // objects pointed to by roots that are guaranteed not to move 96 // during the GC (i.e., non-CSet objects). It is MT-safe. 97 void mark_object(oop obj); 98 99 // Mark the object if it's not already marked. This is used to mark 100 // objects pointed to by roots that have been forwarded during a 101 // GC. It is MT-safe. 102 void mark_forwarded_object(oop from_obj, oop to_obj); 103 public: 104 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 105 G1ParCopyHelper(G1CollectedHeap* g1); 106 107 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 108 template <class T> void do_klass_barrier(T* p, oop new_obj); 109 }; 110 111 enum G1Barrier { 112 G1BarrierNone, 113 G1BarrierKlass 114 }; 115 116 enum G1Mark { 117 G1MarkNone, 118 G1MarkFromRoot, 119 G1MarkPromotedFromRoot 120 }; 121 122 template <G1Barrier barrier, G1Mark do_mark_object> 123 class G1ParCopyClosure : public G1ParCopyHelper { 124 private: 125 template <class T> void do_oop_work(T* p); 126 127 public: 128 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 129 G1ParCopyHelper(g1, par_scan_state) { 130 assert(_ref_processor == NULL, "sanity"); 131 } 132 133 G1ParCopyClosure(G1CollectedHeap* g1) : G1ParCopyHelper(g1) { 134 assert(_ref_processor == NULL, "sanity"); 135 } 136 137 template <class T> void do_oop_nv(T* p) { do_oop_work(p); } 138 virtual void do_oop(oop* p) { do_oop_nv(p); } 139 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 140 141 G1CollectedHeap* g1() { return _g1; }; 142 G1ParScanThreadState* pss() { return _par_scan_state; } 143 }; 144 145 typedef G1ParCopyClosure<G1BarrierNone, G1MarkNone> G1ParScanExtRootClosure; 146 typedef G1ParCopyClosure<G1BarrierNone, G1MarkFromRoot> G1ParScanAndMarkExtRootClosure; 147 typedef G1ParCopyClosure<G1BarrierNone, G1MarkPromotedFromRoot> G1ParScanAndMarkWeakExtRootClosure; 148 // We use a separate closure to handle references during evacuation 149 // failure processing. 150 151 class FilterIntoCSClosure: public ExtendedOopClosure { 152 G1CollectedHeap* _g1; 153 OopClosure* _oc; 154 DirtyCardToOopClosure* _dcto_cl; 155 public: 156 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, 157 G1CollectedHeap* g1, 158 OopClosure* oc) : 159 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } 160 161 template <class T> void do_oop_nv(T* p); 162 virtual void do_oop(oop* p) { do_oop_nv(p); } 163 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 164 bool apply_to_weak_ref_discovered_field() { return true; } 165 }; 166 167 class FilterOutOfRegionClosure: public ExtendedOopClosure { 168 HeapWord* _r_bottom; 169 HeapWord* _r_end; 170 OopClosure* _oc; 171 public: 172 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 173 template <class T> void do_oop_nv(T* p); 174 virtual void do_oop(oop* p) { do_oop_nv(p); } 175 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 176 bool apply_to_weak_ref_discovered_field() { return true; } 177 }; 178 179 // Closure for iterating over object fields during concurrent marking 180 class G1CMOopClosure : public MetadataAwareOopClosure { 181 protected: 182 ConcurrentMark* _cm; 183 private: 184 G1CollectedHeap* _g1h; 185 CMTask* _task; 186 public: 187 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); 188 template <class T> void do_oop_nv(T* p); 189 virtual void do_oop( oop* p) { do_oop_nv(p); } 190 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 191 }; 192 193 // Closure to scan the root regions during concurrent marking 194 class G1RootRegionScanClosure : public MetadataAwareOopClosure { 195 private: 196 G1CollectedHeap* _g1h; 197 ConcurrentMark* _cm; 198 uint _worker_id; 199 public: 200 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, 201 uint worker_id) : 202 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 203 template <class T> void do_oop_nv(T* p); 204 virtual void do_oop( oop* p) { do_oop_nv(p); } 205 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 206 }; 207 208 // Closure that applies the given two closures in sequence. 209 // Used by the RSet refinement code (when updating RSets 210 // during an evacuation pause) to record cards containing 211 // pointers into the collection set. 212 213 class G1Mux2Closure : public ExtendedOopClosure { 214 OopClosure* _c1; 215 OopClosure* _c2; 216 public: 217 G1Mux2Closure(OopClosure *c1, OopClosure *c2); 218 template <class T> void do_oop_nv(T* p); 219 virtual void do_oop(oop* p) { do_oop_nv(p); } 220 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 221 }; 222 223 // A closure that returns true if it is actually applied 224 // to a reference 225 226 class G1TriggerClosure : public ExtendedOopClosure { 227 bool _triggered; 228 public: 229 G1TriggerClosure(); 230 bool triggered() const { return _triggered; } 231 template <class T> void do_oop_nv(T* p); 232 virtual void do_oop(oop* p) { do_oop_nv(p); } 233 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 234 }; 235 236 // A closure which uses a triggering closure to determine 237 // whether to apply an oop closure. 238 239 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure { 240 G1TriggerClosure* _trigger_cl; 241 OopClosure* _oop_cl; 242 public: 243 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); 244 template <class T> void do_oop_nv(T* p); 245 virtual void do_oop(oop* p) { do_oop_nv(p); } 246 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 247 }; 248 249 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { 250 G1CollectedHeap* _g1; 251 G1RemSet* _g1_rem_set; 252 HeapRegion* _from; 253 G1ParPushHeapRSClosure* _push_ref_cl; 254 bool _record_refs_into_cset; 255 uint _worker_i; 256 257 public: 258 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 259 G1RemSet* rs, 260 G1ParPushHeapRSClosure* push_ref_cl, 261 bool record_refs_into_cset, 262 uint worker_i = 0); 263 264 void set_from(HeapRegion* from) { 265 assert(from != NULL, "from region must be non-NULL"); 266 _from = from; 267 } 268 269 bool self_forwarded(oop obj) { 270 markOop m = obj->mark(); 271 bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj)); 272 return result; 273 } 274 275 bool apply_to_weak_ref_discovered_field() { return true; } 276 277 template <class T> void do_oop_nv(T* p); 278 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 279 virtual void do_oop(oop* p) { do_oop_nv(p); } 280 }; 281 282 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP