1 /* 2 * Copyright (c) 2001, 2013, 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 G1RemSet* _g1_rem; 52 ConcurrentMark* _cm; 53 G1ParScanThreadState* _par_scan_state; 54 uint _worker_id; 55 bool _during_initial_mark; 56 bool _mark_in_progress; 57 public: 58 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 59 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, ReferenceProcessor* rp) : 76 G1ParClosureSuper(g1, par_scan_state) 77 { 78 assert(_ref_processor == NULL, "sanity"); 79 _ref_processor = rp; 80 } 81 82 template <class T> void do_oop_nv(T* p); 83 virtual void do_oop(oop* p) { do_oop_nv(p); } 84 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 85 }; 86 87 #define G1_PARTIAL_ARRAY_MASK 0x2 88 89 template <class T> inline bool has_partial_array_mask(T* ref) { 90 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; 91 } 92 93 template <class T> inline T* set_partial_array_mask(T obj) { 94 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); 95 return (T*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); 96 } 97 98 template <class T> inline oop clear_partial_array_mask(T* ref) { 99 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); 100 } 101 102 class G1ParScanPartialArrayClosure : public G1ParClosureSuper { 103 G1ParScanClosure _scanner; 104 105 public: 106 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : 107 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp) 108 { 109 assert(_ref_processor == NULL, "sanity"); 110 } 111 112 G1ParScanClosure* scanner() { 113 return &_scanner; 114 } 115 116 template <class T> void do_oop_nv(T* p); 117 virtual void do_oop(oop* p) { do_oop_nv(p); } 118 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 119 }; 120 121 // Add back base class for metadata 122 class G1ParCopyHelper : public G1ParClosureSuper { 123 Klass* _scanned_klass; 124 125 public: 126 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 127 _scanned_klass(NULL), 128 G1ParClosureSuper(g1, par_scan_state) {} 129 130 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 131 template <class T> void do_klass_barrier(T* p, oop new_obj); 132 }; 133 134 template <G1Barrier barrier, bool do_mark_object> 135 class G1ParCopyClosure : public G1ParCopyHelper { 136 G1ParScanClosure _scanner; 137 template <class T> void do_oop_work(T* p); 138 139 protected: 140 // Mark the object if it's not already marked. This is used to mark 141 // objects pointed to by roots that are guaranteed not to move 142 // during the GC (i.e., non-CSet objects). It is MT-safe. 143 void mark_object(oop obj); 144 145 // Mark the object if it's not already marked. This is used to mark 146 // objects pointed to by roots that have been forwarded during a 147 // GC. It is MT-safe. 148 void mark_forwarded_object(oop from_obj, oop to_obj); 149 150 oop copy_to_survivor_space(oop obj); 151 152 public: 153 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, 154 ReferenceProcessor* rp) : 155 _scanner(g1, par_scan_state, rp), 156 G1ParCopyHelper(g1, par_scan_state) { 157 assert(_ref_processor == NULL, "sanity"); 158 } 159 160 G1ParScanClosure* scanner() { return &_scanner; } 161 162 template <class T> void do_oop_nv(T* p) { 163 do_oop_work(p); 164 } 165 virtual void do_oop(oop* p) { do_oop_nv(p); } 166 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 167 }; 168 169 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure; 170 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure; 171 172 173 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; 174 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure; 175 176 // The following closure type is defined in g1_specialized_oop_closures.hpp: 177 // 178 // typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacClosure; 179 180 // We use a separate closure to handle references during evacuation 181 // failure processing. 182 // We could have used another instance of G1ParScanHeapEvacClosure 183 // (since that closure no longer assumes that the references it 184 // handles point into the collection set). 185 186 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; 187 188 class FilterIntoCSClosure: public ExtendedOopClosure { 189 G1CollectedHeap* _g1; 190 OopClosure* _oc; 191 DirtyCardToOopClosure* _dcto_cl; 192 public: 193 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, 194 G1CollectedHeap* g1, 195 OopClosure* oc) : 196 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } 197 198 template <class T> void do_oop_nv(T* p); 199 virtual void do_oop(oop* p) { do_oop_nv(p); } 200 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 201 bool apply_to_weak_ref_discovered_field() { return true; } 202 }; 203 204 class FilterOutOfRegionClosure: public ExtendedOopClosure { 205 HeapWord* _r_bottom; 206 HeapWord* _r_end; 207 OopClosure* _oc; 208 public: 209 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 210 template <class T> void do_oop_nv(T* p); 211 virtual void do_oop(oop* p) { do_oop_nv(p); } 212 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 213 bool apply_to_weak_ref_discovered_field() { return true; } 214 }; 215 216 // Closure for iterating over object fields during concurrent marking 217 class G1CMOopClosure : public ExtendedOopClosure { 218 private: 219 G1CollectedHeap* _g1h; 220 ConcurrentMark* _cm; 221 CMTask* _task; 222 public: 223 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); 224 template <class T> void do_oop_nv(T* p); 225 virtual void do_oop( oop* p) { do_oop_nv(p); } 226 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 227 }; 228 229 // Closure to scan the root regions during concurrent marking 230 class G1RootRegionScanClosure : public ExtendedOopClosure { 231 private: 232 G1CollectedHeap* _g1h; 233 ConcurrentMark* _cm; 234 uint _worker_id; 235 public: 236 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, 237 uint worker_id) : 238 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } 239 template <class T> void do_oop_nv(T* p); 240 virtual void do_oop( oop* p) { do_oop_nv(p); } 241 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 242 }; 243 244 // Closure that applies the given two closures in sequence. 245 // Used by the RSet refinement code (when updating RSets 246 // during an evacuation pause) to record cards containing 247 // pointers into the collection set. 248 249 class G1Mux2Closure : public ExtendedOopClosure { 250 OopClosure* _c1; 251 OopClosure* _c2; 252 public: 253 G1Mux2Closure(OopClosure *c1, OopClosure *c2); 254 template <class T> void do_oop_nv(T* p); 255 virtual void do_oop(oop* p) { do_oop_nv(p); } 256 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 257 }; 258 259 // A closure that returns true if it is actually applied 260 // to a reference 261 262 class G1TriggerClosure : public ExtendedOopClosure { 263 bool _triggered; 264 public: 265 G1TriggerClosure(); 266 bool triggered() const { return _triggered; } 267 template <class T> void do_oop_nv(T* p); 268 virtual void do_oop(oop* p) { do_oop_nv(p); } 269 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 270 }; 271 272 // A closure which uses a triggering closure to determine 273 // whether to apply an oop closure. 274 275 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure { 276 G1TriggerClosure* _trigger_cl; 277 OopClosure* _oop_cl; 278 public: 279 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); 280 template <class T> void do_oop_nv(T* p); 281 virtual void do_oop(oop* p) { do_oop_nv(p); } 282 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 283 }; 284 285 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { 286 G1CollectedHeap* _g1; 287 G1RemSet* _g1_rem_set; 288 HeapRegion* _from; 289 OopsInHeapRegionClosure* _push_ref_cl; 290 bool _record_refs_into_cset; 291 int _worker_i; 292 293 public: 294 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 295 G1RemSet* rs, 296 OopsInHeapRegionClosure* push_ref_cl, 297 bool record_refs_into_cset, 298 int worker_i = 0); 299 300 void set_from(HeapRegion* from) { 301 assert(from != NULL, "from region must be non-NULL"); 302 _from = from; 303 } 304 305 bool self_forwarded(oop obj) { 306 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); 307 return result; 308 } 309 310 bool apply_to_weak_ref_discovered_field() { return true; } 311 312 template <class T> void do_oop_nv(T* p); 313 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 314 virtual void do_oop(oop* p) { do_oop_nv(p); } 315 }; 316 317 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP