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 public: 54 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 55 bool apply_to_weak_ref_discovered_field() { return true; } 56 }; 57 58 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 59 public: 60 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 61 G1ParScanThreadState* par_scan_state): 62 G1ParClosureSuper(g1, par_scan_state) { } 63 64 template <class T> void do_oop_nv(T* p); 65 virtual void do_oop(oop* p) { do_oop_nv(p); } 66 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 67 }; 68 69 class G1ParScanClosure : public G1ParClosureSuper { 70 public: 71 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : 72 G1ParClosureSuper(g1, par_scan_state) 73 { 74 assert(_ref_processor == NULL, "sanity"); 75 _ref_processor = rp; 76 } 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 83 // Add back base class for metadata 84 class G1ParCopyHelper : public G1ParClosureSuper { 85 protected: 86 Klass* _scanned_klass; 87 ConcurrentMark* _cm; 88 89 // Mark the object if it's not already marked. This is used to mark 90 // objects pointed to by roots that are guaranteed not to move 91 // during the GC (i.e., non-CSet objects). It is MT-safe. 92 void mark_object(oop obj); 93 94 // Mark the object if it's not already marked. This is used to mark 95 // objects pointed to by roots that have been forwarded during a 96 // GC. It is MT-safe. 97 void mark_forwarded_object(oop from_obj, oop to_obj); 98 public: 99 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 100 101 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 102 template <class T> void do_klass_barrier(T* p, oop new_obj); 103 }; 104 105 template <G1Barrier barrier, bool do_mark_object> 106 class G1ParCopyClosure : public G1ParCopyHelper { 107 private: 108 template <class T> void do_oop_work(T* p); 109 110 public: 111 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, 112 ReferenceProcessor* rp) : 113 G1ParCopyHelper(g1, par_scan_state) { 114 assert(_ref_processor == NULL, "sanity"); 115 } 116 117 template <class T> void do_oop_nv(T* p) { do_oop_work(p); } 118 virtual void do_oop(oop* p) { do_oop_nv(p); } 119 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 120 }; 121 122 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure; 123 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure; 124 125 126 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; 127 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure; 128 129 // We use a separate closure to handle references during evacuation 130 // failure processing. 131 132 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; 133 134 class FilterIntoCSClosure: public ExtendedOopClosure { 135 G1CollectedHeap* _g1; 136 OopClosure* _oc; 137 DirtyCardToOopClosure* _dcto_cl; 138 public: 139 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, 140 G1CollectedHeap* g1, 141 OopClosure* oc) : 142 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } 143 144 template <class T> void do_oop_nv(T* p); 145 virtual void do_oop(oop* p) { do_oop_nv(p); } 146 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 147 bool apply_to_weak_ref_discovered_field() { return true; } 148 }; 149 150 class FilterOutOfRegionClosure: public ExtendedOopClosure { 151 HeapWord* _r_bottom; 152 HeapWord* _r_end; 153 OopClosure* _oc; 154 public: 155 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 156 template <class T> void do_oop_nv(T* p); 157 virtual void do_oop(oop* p) { do_oop_nv(p); } 158 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 159 bool apply_to_weak_ref_discovered_field() { return true; } 160 }; 161 162 // Closure for iterating over object fields during concurrent marking 163 class G1CMOopClosure : public ExtendedOopClosure { 164 private: 165 G1CollectedHeap* _g1h; 166 ConcurrentMark* _cm; 167 CMTask* _task; 168 public: 169 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); 170 template <class T> void do_oop_nv(T* p); 171 virtual void do_oop( oop* p) { do_oop_nv(p); } 172 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 173 }; 174 175 // Closure to scan the root regions during concurrent marking 176 class G1RootRegionScanClosure : public ExtendedOopClosure { 177 private: 178 G1CollectedHeap* _g1h; 179 ConcurrentMark* _cm; 180 uint _worker_id; 181 public: 182 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, 183 uint worker_id) : 184 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 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 // Closure that applies the given two closures in sequence. 191 // Used by the RSet refinement code (when updating RSets 192 // during an evacuation pause) to record cards containing 193 // pointers into the collection set. 194 195 class G1Mux2Closure : public ExtendedOopClosure { 196 OopClosure* _c1; 197 OopClosure* _c2; 198 public: 199 G1Mux2Closure(OopClosure *c1, OopClosure *c2); 200 template <class T> void do_oop_nv(T* p); 201 virtual void do_oop(oop* p) { do_oop_nv(p); } 202 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 203 }; 204 205 // A closure that returns true if it is actually applied 206 // to a reference 207 208 class G1TriggerClosure : public ExtendedOopClosure { 209 bool _triggered; 210 public: 211 G1TriggerClosure(); 212 bool triggered() const { return _triggered; } 213 template <class T> void do_oop_nv(T* p); 214 virtual void do_oop(oop* p) { do_oop_nv(p); } 215 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 216 }; 217 218 // A closure which uses a triggering closure to determine 219 // whether to apply an oop closure. 220 221 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure { 222 G1TriggerClosure* _trigger_cl; 223 OopClosure* _oop_cl; 224 public: 225 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); 226 template <class T> void do_oop_nv(T* p); 227 virtual void do_oop(oop* p) { do_oop_nv(p); } 228 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 229 }; 230 231 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { 232 G1CollectedHeap* _g1; 233 G1RemSet* _g1_rem_set; 234 HeapRegion* _from; 235 OopsInHeapRegionClosure* _push_ref_cl; 236 bool _record_refs_into_cset; 237 uint _worker_i; 238 239 public: 240 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 241 G1RemSet* rs, 242 OopsInHeapRegionClosure* push_ref_cl, 243 bool record_refs_into_cset, 244 uint worker_i = 0); 245 246 void set_from(HeapRegion* from) { 247 assert(from != NULL, "from region must be non-NULL"); 248 _from = from; 249 } 250 251 bool self_forwarded(oop obj) { 252 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); 253 return result; 254 } 255 256 bool apply_to_weak_ref_discovered_field() { return true; } 257 258 template <class T> void do_oop_nv(T* p); 259 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 260 virtual void do_oop(oop* p) { do_oop_nv(p); } 261 }; 262 263 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP