Thu, 12 Oct 2017 21:27:07 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |
aoqi@0 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |
aoqi@0 | 27 | |
aoqi@0 | 28 | #include "memory/genOopClosures.hpp" |
stefank@6982 | 29 | #include "memory/iterator.hpp" |
aoqi@0 | 30 | |
aoqi@0 | 31 | ///////////////////////////////////////////////////////////////// |
aoqi@0 | 32 | // Closures used by ConcurrentMarkSweepGeneration's collector |
aoqi@0 | 33 | ///////////////////////////////////////////////////////////////// |
aoqi@0 | 34 | class ConcurrentMarkSweepGeneration; |
aoqi@0 | 35 | class CMSBitMap; |
aoqi@0 | 36 | class CMSMarkStack; |
aoqi@0 | 37 | class CMSCollector; |
aoqi@0 | 38 | class MarkFromRootsClosure; |
aoqi@0 | 39 | class Par_MarkFromRootsClosure; |
aoqi@0 | 40 | |
aoqi@0 | 41 | // Decode the oop and call do_oop on it. |
aoqi@0 | 42 | #define DO_OOP_WORK_DEFN \ |
aoqi@0 | 43 | void do_oop(oop obj); \ |
aoqi@0 | 44 | template <class T> inline void do_oop_work(T* p) { \ |
aoqi@0 | 45 | T heap_oop = oopDesc::load_heap_oop(p); \ |
aoqi@0 | 46 | if (!oopDesc::is_null(heap_oop)) { \ |
aoqi@0 | 47 | oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
aoqi@0 | 48 | do_oop(obj); \ |
aoqi@0 | 49 | } \ |
aoqi@0 | 50 | } |
aoqi@0 | 51 | |
stefank@6982 | 52 | // TODO: This duplication of the MetadataAwareOopClosure class is only needed |
stefank@6982 | 53 | // because some CMS OopClosures derive from OopsInGenClosure. It would be |
stefank@6982 | 54 | // good to get rid of them completely. |
stefank@6982 | 55 | class MetadataAwareOopsInGenClosure: public OopsInGenClosure { |
stefank@6982 | 56 | KlassToOopClosure _klass_closure; |
aoqi@0 | 57 | public: |
stefank@6982 | 58 | MetadataAwareOopsInGenClosure() { |
aoqi@0 | 59 | _klass_closure.initialize(this); |
aoqi@0 | 60 | } |
aoqi@0 | 61 | |
aoqi@0 | 62 | virtual bool do_metadata() { return do_metadata_nv(); } |
aoqi@0 | 63 | inline bool do_metadata_nv() { return true; } |
aoqi@0 | 64 | |
aoqi@0 | 65 | virtual void do_klass(Klass* k); |
aoqi@0 | 66 | void do_klass_nv(Klass* k); |
aoqi@0 | 67 | |
aoqi@0 | 68 | virtual void do_class_loader_data(ClassLoaderData* cld); |
aoqi@0 | 69 | }; |
aoqi@0 | 70 | |
stefank@6982 | 71 | class MarkRefsIntoClosure: public MetadataAwareOopsInGenClosure { |
aoqi@0 | 72 | private: |
aoqi@0 | 73 | const MemRegion _span; |
aoqi@0 | 74 | CMSBitMap* _bitMap; |
aoqi@0 | 75 | protected: |
aoqi@0 | 76 | DO_OOP_WORK_DEFN |
aoqi@0 | 77 | public: |
aoqi@0 | 78 | MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); |
aoqi@0 | 79 | virtual void do_oop(oop* p); |
aoqi@0 | 80 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 81 | |
aoqi@0 | 82 | Prefetch::style prefetch_style() { |
aoqi@0 | 83 | return Prefetch::do_read; |
aoqi@0 | 84 | } |
aoqi@0 | 85 | }; |
aoqi@0 | 86 | |
stefank@6982 | 87 | class Par_MarkRefsIntoClosure: public MetadataAwareOopsInGenClosure { |
aoqi@0 | 88 | private: |
aoqi@0 | 89 | const MemRegion _span; |
aoqi@0 | 90 | CMSBitMap* _bitMap; |
aoqi@0 | 91 | protected: |
aoqi@0 | 92 | DO_OOP_WORK_DEFN |
aoqi@0 | 93 | public: |
aoqi@0 | 94 | Par_MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap); |
aoqi@0 | 95 | virtual void do_oop(oop* p); |
aoqi@0 | 96 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 97 | |
aoqi@0 | 98 | Prefetch::style prefetch_style() { |
aoqi@0 | 99 | return Prefetch::do_read; |
aoqi@0 | 100 | } |
aoqi@0 | 101 | }; |
aoqi@0 | 102 | |
aoqi@0 | 103 | // A variant of the above used in certain kinds of CMS |
aoqi@0 | 104 | // marking verification. |
stefank@6982 | 105 | class MarkRefsIntoVerifyClosure: public MetadataAwareOopsInGenClosure { |
aoqi@0 | 106 | private: |
aoqi@0 | 107 | const MemRegion _span; |
aoqi@0 | 108 | CMSBitMap* _verification_bm; |
aoqi@0 | 109 | CMSBitMap* _cms_bm; |
aoqi@0 | 110 | protected: |
aoqi@0 | 111 | DO_OOP_WORK_DEFN |
aoqi@0 | 112 | public: |
aoqi@0 | 113 | MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm, |
aoqi@0 | 114 | CMSBitMap* cms_bm); |
aoqi@0 | 115 | virtual void do_oop(oop* p); |
aoqi@0 | 116 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 117 | |
aoqi@0 | 118 | Prefetch::style prefetch_style() { |
aoqi@0 | 119 | return Prefetch::do_read; |
aoqi@0 | 120 | } |
aoqi@0 | 121 | }; |
aoqi@0 | 122 | |
aoqi@0 | 123 | // The non-parallel version (the parallel version appears further below). |
stefank@6982 | 124 | class PushAndMarkClosure: public MetadataAwareOopClosure { |
aoqi@0 | 125 | private: |
aoqi@0 | 126 | CMSCollector* _collector; |
aoqi@0 | 127 | MemRegion _span; |
aoqi@0 | 128 | CMSBitMap* _bit_map; |
aoqi@0 | 129 | CMSBitMap* _mod_union_table; |
aoqi@0 | 130 | CMSMarkStack* _mark_stack; |
aoqi@0 | 131 | bool _concurrent_precleaning; |
aoqi@0 | 132 | protected: |
aoqi@0 | 133 | DO_OOP_WORK_DEFN |
aoqi@0 | 134 | public: |
aoqi@0 | 135 | PushAndMarkClosure(CMSCollector* collector, |
aoqi@0 | 136 | MemRegion span, |
aoqi@0 | 137 | ReferenceProcessor* rp, |
aoqi@0 | 138 | CMSBitMap* bit_map, |
aoqi@0 | 139 | CMSBitMap* mod_union_table, |
aoqi@0 | 140 | CMSMarkStack* mark_stack, |
aoqi@0 | 141 | bool concurrent_precleaning); |
aoqi@0 | 142 | virtual void do_oop(oop* p); |
aoqi@0 | 143 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 144 | inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); } |
aoqi@0 | 145 | inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); } |
aoqi@0 | 146 | |
aoqi@0 | 147 | Prefetch::style prefetch_style() { |
aoqi@0 | 148 | return Prefetch::do_read; |
aoqi@0 | 149 | } |
aoqi@0 | 150 | }; |
aoqi@0 | 151 | |
aoqi@0 | 152 | // In the parallel case, the bit map and the |
aoqi@0 | 153 | // reference processor are currently all shared. Access to |
aoqi@0 | 154 | // these shared mutable structures must use appropriate |
aoqi@0 | 155 | // synchronization (for instance, via CAS). The marking stack |
aoqi@0 | 156 | // used in the non-parallel case above is here replaced with |
aoqi@0 | 157 | // an OopTaskQueue structure to allow efficient work stealing. |
stefank@6982 | 158 | class Par_PushAndMarkClosure: public MetadataAwareOopClosure { |
aoqi@0 | 159 | private: |
aoqi@0 | 160 | CMSCollector* _collector; |
aoqi@0 | 161 | MemRegion _span; |
aoqi@0 | 162 | CMSBitMap* _bit_map; |
aoqi@0 | 163 | OopTaskQueue* _work_queue; |
aoqi@0 | 164 | protected: |
aoqi@0 | 165 | DO_OOP_WORK_DEFN |
aoqi@0 | 166 | public: |
aoqi@0 | 167 | Par_PushAndMarkClosure(CMSCollector* collector, |
aoqi@0 | 168 | MemRegion span, |
aoqi@0 | 169 | ReferenceProcessor* rp, |
aoqi@0 | 170 | CMSBitMap* bit_map, |
aoqi@0 | 171 | OopTaskQueue* work_queue); |
aoqi@0 | 172 | virtual void do_oop(oop* p); |
aoqi@0 | 173 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 174 | inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
aoqi@0 | 175 | inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); } |
aoqi@0 | 176 | |
aoqi@0 | 177 | Prefetch::style prefetch_style() { |
aoqi@0 | 178 | return Prefetch::do_read; |
aoqi@0 | 179 | } |
aoqi@0 | 180 | }; |
aoqi@0 | 181 | |
aoqi@0 | 182 | // The non-parallel version (the parallel version appears further below). |
stefank@6982 | 183 | class MarkRefsIntoAndScanClosure: public MetadataAwareOopsInGenClosure { |
aoqi@0 | 184 | private: |
aoqi@0 | 185 | MemRegion _span; |
aoqi@0 | 186 | CMSBitMap* _bit_map; |
aoqi@0 | 187 | CMSMarkStack* _mark_stack; |
aoqi@0 | 188 | PushAndMarkClosure _pushAndMarkClosure; |
aoqi@0 | 189 | CMSCollector* _collector; |
aoqi@0 | 190 | Mutex* _freelistLock; |
aoqi@0 | 191 | bool _yield; |
aoqi@0 | 192 | // Whether closure is being used for concurrent precleaning |
aoqi@0 | 193 | bool _concurrent_precleaning; |
aoqi@0 | 194 | protected: |
aoqi@0 | 195 | DO_OOP_WORK_DEFN |
aoqi@0 | 196 | public: |
aoqi@0 | 197 | MarkRefsIntoAndScanClosure(MemRegion span, |
aoqi@0 | 198 | ReferenceProcessor* rp, |
aoqi@0 | 199 | CMSBitMap* bit_map, |
aoqi@0 | 200 | CMSBitMap* mod_union_table, |
aoqi@0 | 201 | CMSMarkStack* mark_stack, |
aoqi@0 | 202 | CMSCollector* collector, |
aoqi@0 | 203 | bool should_yield, |
aoqi@0 | 204 | bool concurrent_precleaning); |
aoqi@0 | 205 | virtual void do_oop(oop* p); |
aoqi@0 | 206 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 207 | inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
aoqi@0 | 208 | inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); } |
aoqi@0 | 209 | |
aoqi@0 | 210 | Prefetch::style prefetch_style() { |
aoqi@0 | 211 | return Prefetch::do_read; |
aoqi@0 | 212 | } |
aoqi@0 | 213 | void set_freelistLock(Mutex* m) { |
aoqi@0 | 214 | _freelistLock = m; |
aoqi@0 | 215 | } |
aoqi@0 | 216 | |
aoqi@0 | 217 | private: |
aoqi@0 | 218 | inline void do_yield_check(); |
aoqi@0 | 219 | void do_yield_work(); |
aoqi@0 | 220 | bool take_from_overflow_list(); |
aoqi@0 | 221 | }; |
aoqi@0 | 222 | |
aoqi@0 | 223 | // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit |
aoqi@0 | 224 | // stack and the bitMap are shared, so access needs to be suitably |
aoqi@0 | 225 | // sycnhronized. An OopTaskQueue structure, supporting efficient |
aoqi@0 | 226 | // workstealing, replaces a CMSMarkStack for storing grey objects. |
stefank@6982 | 227 | class Par_MarkRefsIntoAndScanClosure: public MetadataAwareOopsInGenClosure { |
aoqi@0 | 228 | private: |
aoqi@0 | 229 | MemRegion _span; |
aoqi@0 | 230 | CMSBitMap* _bit_map; |
aoqi@0 | 231 | OopTaskQueue* _work_queue; |
aoqi@0 | 232 | const uint _low_water_mark; |
aoqi@0 | 233 | Par_PushAndMarkClosure _par_pushAndMarkClosure; |
aoqi@0 | 234 | protected: |
aoqi@0 | 235 | DO_OOP_WORK_DEFN |
aoqi@0 | 236 | public: |
aoqi@0 | 237 | Par_MarkRefsIntoAndScanClosure(CMSCollector* collector, |
aoqi@0 | 238 | MemRegion span, |
aoqi@0 | 239 | ReferenceProcessor* rp, |
aoqi@0 | 240 | CMSBitMap* bit_map, |
aoqi@0 | 241 | OopTaskQueue* work_queue); |
aoqi@0 | 242 | virtual void do_oop(oop* p); |
aoqi@0 | 243 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 244 | inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
aoqi@0 | 245 | inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); } |
aoqi@0 | 246 | |
aoqi@0 | 247 | Prefetch::style prefetch_style() { |
aoqi@0 | 248 | return Prefetch::do_read; |
aoqi@0 | 249 | } |
aoqi@0 | 250 | void trim_queue(uint size); |
aoqi@0 | 251 | }; |
aoqi@0 | 252 | |
aoqi@0 | 253 | // This closure is used during the concurrent marking phase |
aoqi@0 | 254 | // following the first checkpoint. Its use is buried in |
aoqi@0 | 255 | // the closure MarkFromRootsClosure. |
stefank@6982 | 256 | class PushOrMarkClosure: public MetadataAwareOopClosure { |
aoqi@0 | 257 | private: |
aoqi@0 | 258 | CMSCollector* _collector; |
aoqi@0 | 259 | MemRegion _span; |
aoqi@0 | 260 | CMSBitMap* _bitMap; |
aoqi@0 | 261 | CMSMarkStack* _markStack; |
aoqi@0 | 262 | HeapWord* const _finger; |
aoqi@0 | 263 | MarkFromRootsClosure* const |
aoqi@0 | 264 | _parent; |
aoqi@0 | 265 | protected: |
aoqi@0 | 266 | DO_OOP_WORK_DEFN |
aoqi@0 | 267 | public: |
aoqi@0 | 268 | PushOrMarkClosure(CMSCollector* cms_collector, |
aoqi@0 | 269 | MemRegion span, |
aoqi@0 | 270 | CMSBitMap* bitMap, |
aoqi@0 | 271 | CMSMarkStack* markStack, |
aoqi@0 | 272 | HeapWord* finger, |
aoqi@0 | 273 | MarkFromRootsClosure* parent); |
aoqi@0 | 274 | virtual void do_oop(oop* p); |
aoqi@0 | 275 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 276 | inline void do_oop_nv(oop* p) { PushOrMarkClosure::do_oop_work(p); } |
aoqi@0 | 277 | inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); } |
aoqi@0 | 278 | |
aoqi@0 | 279 | // Deal with a stack overflow condition |
aoqi@0 | 280 | void handle_stack_overflow(HeapWord* lost); |
aoqi@0 | 281 | private: |
aoqi@0 | 282 | inline void do_yield_check(); |
aoqi@0 | 283 | }; |
aoqi@0 | 284 | |
aoqi@0 | 285 | // A parallel (MT) version of the above. |
aoqi@0 | 286 | // This closure is used during the concurrent marking phase |
aoqi@0 | 287 | // following the first checkpoint. Its use is buried in |
aoqi@0 | 288 | // the closure Par_MarkFromRootsClosure. |
stefank@6982 | 289 | class Par_PushOrMarkClosure: public MetadataAwareOopClosure { |
aoqi@0 | 290 | private: |
aoqi@0 | 291 | CMSCollector* _collector; |
aoqi@0 | 292 | MemRegion _whole_span; |
aoqi@0 | 293 | MemRegion _span; // local chunk |
aoqi@0 | 294 | CMSBitMap* _bit_map; |
aoqi@0 | 295 | OopTaskQueue* _work_queue; |
aoqi@0 | 296 | CMSMarkStack* _overflow_stack; |
aoqi@0 | 297 | HeapWord* const _finger; |
aoqi@0 | 298 | HeapWord** const _global_finger_addr; |
aoqi@0 | 299 | Par_MarkFromRootsClosure* const |
aoqi@0 | 300 | _parent; |
aoqi@0 | 301 | protected: |
aoqi@0 | 302 | DO_OOP_WORK_DEFN |
aoqi@0 | 303 | public: |
aoqi@0 | 304 | Par_PushOrMarkClosure(CMSCollector* cms_collector, |
aoqi@0 | 305 | MemRegion span, |
aoqi@0 | 306 | CMSBitMap* bit_map, |
aoqi@0 | 307 | OopTaskQueue* work_queue, |
aoqi@0 | 308 | CMSMarkStack* mark_stack, |
aoqi@0 | 309 | HeapWord* finger, |
aoqi@0 | 310 | HeapWord** global_finger_addr, |
aoqi@0 | 311 | Par_MarkFromRootsClosure* parent); |
aoqi@0 | 312 | virtual void do_oop(oop* p); |
aoqi@0 | 313 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 314 | inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
aoqi@0 | 315 | inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); } |
aoqi@0 | 316 | |
aoqi@0 | 317 | // Deal with a stack overflow condition |
aoqi@0 | 318 | void handle_stack_overflow(HeapWord* lost); |
aoqi@0 | 319 | private: |
aoqi@0 | 320 | inline void do_yield_check(); |
aoqi@0 | 321 | }; |
aoqi@0 | 322 | |
aoqi@0 | 323 | // For objects in CMS generation, this closure marks |
aoqi@0 | 324 | // given objects (transitively) as being reachable/live. |
aoqi@0 | 325 | // This is currently used during the (weak) reference object |
aoqi@0 | 326 | // processing phase of the CMS final checkpoint step, as |
aoqi@0 | 327 | // well as during the concurrent precleaning of the discovered |
aoqi@0 | 328 | // reference lists. |
stefank@6982 | 329 | class CMSKeepAliveClosure: public MetadataAwareOopClosure { |
aoqi@0 | 330 | private: |
aoqi@0 | 331 | CMSCollector* _collector; |
aoqi@0 | 332 | const MemRegion _span; |
aoqi@0 | 333 | CMSMarkStack* _mark_stack; |
aoqi@0 | 334 | CMSBitMap* _bit_map; |
aoqi@0 | 335 | bool _concurrent_precleaning; |
aoqi@0 | 336 | protected: |
aoqi@0 | 337 | DO_OOP_WORK_DEFN |
aoqi@0 | 338 | public: |
aoqi@0 | 339 | CMSKeepAliveClosure(CMSCollector* collector, MemRegion span, |
aoqi@0 | 340 | CMSBitMap* bit_map, CMSMarkStack* mark_stack, |
aoqi@0 | 341 | bool cpc); |
aoqi@0 | 342 | bool concurrent_precleaning() const { return _concurrent_precleaning; } |
aoqi@0 | 343 | virtual void do_oop(oop* p); |
aoqi@0 | 344 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 345 | inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
aoqi@0 | 346 | inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); } |
aoqi@0 | 347 | }; |
aoqi@0 | 348 | |
stefank@6982 | 349 | class CMSInnerParMarkAndPushClosure: public MetadataAwareOopClosure { |
aoqi@0 | 350 | private: |
aoqi@0 | 351 | CMSCollector* _collector; |
aoqi@0 | 352 | MemRegion _span; |
aoqi@0 | 353 | OopTaskQueue* _work_queue; |
aoqi@0 | 354 | CMSBitMap* _bit_map; |
aoqi@0 | 355 | protected: |
aoqi@0 | 356 | DO_OOP_WORK_DEFN |
aoqi@0 | 357 | public: |
aoqi@0 | 358 | CMSInnerParMarkAndPushClosure(CMSCollector* collector, |
aoqi@0 | 359 | MemRegion span, CMSBitMap* bit_map, |
aoqi@0 | 360 | OopTaskQueue* work_queue); |
aoqi@0 | 361 | virtual void do_oop(oop* p); |
aoqi@0 | 362 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 363 | inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
aoqi@0 | 364 | inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); } |
aoqi@0 | 365 | }; |
aoqi@0 | 366 | |
aoqi@0 | 367 | // A parallel (MT) version of the above, used when |
aoqi@0 | 368 | // reference processing is parallel; the only difference |
aoqi@0 | 369 | // is in the do_oop method. |
stefank@6982 | 370 | class CMSParKeepAliveClosure: public MetadataAwareOopClosure { |
aoqi@0 | 371 | private: |
aoqi@0 | 372 | MemRegion _span; |
aoqi@0 | 373 | OopTaskQueue* _work_queue; |
aoqi@0 | 374 | CMSBitMap* _bit_map; |
aoqi@0 | 375 | CMSInnerParMarkAndPushClosure |
aoqi@0 | 376 | _mark_and_push; |
aoqi@0 | 377 | const uint _low_water_mark; |
aoqi@0 | 378 | void trim_queue(uint max); |
aoqi@0 | 379 | protected: |
aoqi@0 | 380 | DO_OOP_WORK_DEFN |
aoqi@0 | 381 | public: |
aoqi@0 | 382 | CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span, |
aoqi@0 | 383 | CMSBitMap* bit_map, OopTaskQueue* work_queue); |
aoqi@0 | 384 | virtual void do_oop(oop* p); |
aoqi@0 | 385 | virtual void do_oop(narrowOop* p); |
aoqi@0 | 386 | }; |
aoqi@0 | 387 | |
aoqi@0 | 388 | #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP |