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 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 56 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 57 ~G1ParClosureSuper() { } 58 59 public: 60 virtual bool apply_to_weak_ref_discovered_field() { return true; } 61 }; 62 63 class G1ParPushHeapRSClosure : public G1ParClosureSuper { 64 public: 65 G1ParPushHeapRSClosure(G1CollectedHeap* g1, 66 G1ParScanThreadState* par_scan_state): 67 G1ParClosureSuper(g1, par_scan_state) { } 68 69 template <class T> void do_oop_nv(T* p); 70 virtual void do_oop(oop* p) { do_oop_nv(p); } 71 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 72 }; 73 74 class G1ParScanClosure : public G1ParClosureSuper { 75 public: 76 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 77 G1ParClosureSuper(g1, par_scan_state) { } 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 void set_ref_processor(ReferenceProcessor* rp) { 84 set_ref_processor_internal(rp); 85 } 86 }; 87 88 // Add back base class for metadata 89 class G1ParCopyHelper : public OopClosure { 90 protected: 91 G1CollectedHeap* _g1; 92 G1ParScanThreadState* _par_scan_state; 93 uint _worker_id; // Cache value from par_scan_state. 94 Klass* _scanned_klass; 95 ConcurrentMark* _cm; 96 97 // Mark the object if it's not already marked. This is used to mark 98 // objects pointed to by roots that are guaranteed not to move 99 // during the GC (i.e., non-CSet objects). It is MT-safe. 100 inline void mark_object(oop obj); 101 102 // Mark the object if it's not already marked. This is used to mark 103 // objects pointed to by roots that have been forwarded during a 104 // GC. It is MT-safe. 105 inline void mark_forwarded_object(oop from_obj, oop to_obj); 106 107 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); 108 ~G1ParCopyHelper() { } 109 110 public: 111 void set_scanned_klass(Klass* k) { _scanned_klass = k; } 112 template <class T> inline void do_klass_barrier(T* p, oop new_obj); 113 }; 114 115 enum G1Barrier { 116 G1BarrierNone, 117 G1BarrierKlass 118 }; 119 120 enum G1Mark { 121 G1MarkNone, 122 G1MarkFromRoot, 123 G1MarkPromotedFromRoot 124 }; 125 126 template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext> 127 class G1ParCopyClosure : public G1ParCopyHelper { 128 public: 129 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) : 130 G1ParCopyHelper(g1, par_scan_state) { } 131 132 template <class T> void do_oop_work(T* p); 133 virtual void do_oop(oop* p) { do_oop_work(p); } 134 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 135 }; 136 137 class G1KlassScanClosure : public KlassClosure { 138 G1ParCopyHelper* _closure; 139 bool _process_only_dirty; 140 int _count; 141 public: 142 G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty) 143 : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {} 144 void do_klass(Klass* klass); 145 }; 146 147 class FilterIntoCSClosure: public OopClosure { 148 G1CollectedHeap* _g1; 149 OopClosure* _oc; 150 public: 151 FilterIntoCSClosure(G1CollectedHeap* g1, OopClosure* oc) : _g1(g1), _oc(oc) { } 152 153 template <class T> void do_oop_work(T* p); 154 virtual void do_oop(oop* p) { do_oop_work(p); } 155 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 156 }; 157 158 class FilterOutOfRegionClosure: public ExtendedOopClosure { 159 HeapWord* _r_bottom; 160 HeapWord* _r_end; 161 OopClosure* _oc; 162 public: 163 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); 164 template <class T> void do_oop_nv(T* p); 165 virtual void do_oop(oop* p) { do_oop_nv(p); } 166 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } 167 bool apply_to_weak_ref_discovered_field() { return true; } 168 }; 169 170 // Closure for iterating over object fields during concurrent marking 171 class G1CMOopClosure : public MetadataAwareOopClosure { 172 protected: 173 ConcurrentMark* _cm; 174 private: 175 G1CollectedHeap* _g1h; 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 MetadataAwareOopClosure { 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 OopClosure { 205 OopClosure* _c1; 206 OopClosure* _c2; 207 public: 208 G1Mux2Closure(OopClosure *c1, OopClosure *c2); 209 template <class T> inline void do_oop_work(T* p); 210 virtual inline void do_oop(oop* p); 211 virtual inline void do_oop(narrowOop* p); 212 }; 213 214 // A closure that returns true if it is actually applied 215 // to a reference 216 217 class G1TriggerClosure : public OopClosure { 218 bool _triggered; 219 public: 220 G1TriggerClosure(); 221 bool triggered() const { return _triggered; } 222 template <class T> inline void do_oop_work(T* p); 223 virtual inline void do_oop(oop* p); 224 virtual inline void do_oop(narrowOop* 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 OopClosure { 231 G1TriggerClosure* _trigger_cl; 232 OopClosure* _oop_cl; 233 public: 234 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); 235 template <class T> inline void do_oop_work(T* p); 236 virtual inline void do_oop(oop* p); 237 virtual inline void do_oop(narrowOop* p); 238 }; 239 240 class G1UpdateRSOrPushRefOopClosure: public OopClosure { 241 G1CollectedHeap* _g1; 242 G1RemSet* _g1_rem_set; 243 HeapRegion* _from; 244 G1ParPushHeapRSClosure* _push_ref_cl; 245 bool _record_refs_into_cset; 246 uint _worker_i; 247 248 public: 249 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, 250 G1RemSet* rs, 251 G1ParPushHeapRSClosure* push_ref_cl, 252 bool record_refs_into_cset, 253 uint 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 markOop m = obj->mark(); 262 bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj)); 263 return result; 264 } 265 266 template <class T> inline void do_oop_work(T* p); 267 virtual inline void do_oop(narrowOop* p); 268 virtual inline void do_oop(oop* p); 269 }; 270 271 #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP