Wed, 02 Nov 2011 08:04:23 +0100
7106751: G1: gc/gctests/nativeGC03 crashes VM with SIGSEGV
Summary: _cset_rs_update_cl[] was indexed with values beyond what it is set up to handle.
Reviewed-by: ysr, jmasa, johnc
ysr@777 | 1 | /* |
tonyp@2493 | 2 | * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |
stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |
stefank@2314 | 27 | |
stefank@2314 | 28 | #include "gc_implementation/g1/sparsePRT.hpp" |
stefank@2314 | 29 | |
ysr@777 | 30 | // Remembered set for a heap region. Represent a set of "cards" that |
ysr@777 | 31 | // contain pointers into the owner heap region. Cards are defined somewhat |
ysr@777 | 32 | // abstractly, in terms of what the "BlockOffsetTable" in use can parse. |
ysr@777 | 33 | |
ysr@777 | 34 | class G1CollectedHeap; |
ysr@777 | 35 | class G1BlockOffsetSharedArray; |
ysr@777 | 36 | class HeapRegion; |
ysr@777 | 37 | class HeapRegionRemSetIterator; |
ysr@777 | 38 | class PosParPRT; |
ysr@777 | 39 | class SparsePRT; |
ysr@777 | 40 | |
tonyp@2493 | 41 | // Essentially a wrapper around SparsePRTCleanupTask. See |
tonyp@2493 | 42 | // sparsePRT.hpp for more details. |
tonyp@2493 | 43 | class HRRSCleanupTask : public SparsePRTCleanupTask { |
tonyp@2493 | 44 | }; |
ysr@777 | 45 | |
ysr@777 | 46 | // The "_coarse_map" is a bitmap with one bit for each region, where set |
ysr@777 | 47 | // bits indicate that the corresponding region may contain some pointer |
ysr@777 | 48 | // into the owning region. |
ysr@777 | 49 | |
ysr@777 | 50 | // The "_fine_grain_entries" array is an open hash table of PerRegionTables |
ysr@777 | 51 | // (PRTs), indicating regions for which we're keeping the RS as a set of |
ysr@777 | 52 | // cards. The strategy is to cap the size of the fine-grain table, |
ysr@777 | 53 | // deleting an entry and setting the corresponding coarse-grained bit when |
ysr@777 | 54 | // we would overflow this cap. |
ysr@777 | 55 | |
ysr@777 | 56 | // We use a mixture of locking and lock-free techniques here. We allow |
ysr@777 | 57 | // threads to locate PRTs without locking, but threads attempting to alter |
ysr@777 | 58 | // a bucket list obtain a lock. This means that any failing attempt to |
ysr@777 | 59 | // find a PRT must be retried with the lock. It might seem dangerous that |
ysr@777 | 60 | // a read can find a PRT that is concurrently deleted. This is all right, |
ysr@777 | 61 | // because: |
ysr@777 | 62 | // |
ysr@777 | 63 | // 1) We only actually free PRT's at safe points (though we reuse them at |
ysr@777 | 64 | // other times). |
ysr@777 | 65 | // 2) We find PRT's in an attempt to add entries. If a PRT is deleted, |
ysr@777 | 66 | // it's _coarse_map bit is set, so the that we were attempting to add |
ysr@777 | 67 | // is represented. If a deleted PRT is re-used, a thread adding a bit, |
ysr@777 | 68 | // thinking the PRT is for a different region, does no harm. |
ysr@777 | 69 | |
apetrusenko@984 | 70 | class OtherRegionsTable VALUE_OBJ_CLASS_SPEC { |
ysr@777 | 71 | friend class HeapRegionRemSetIterator; |
ysr@777 | 72 | |
ysr@777 | 73 | G1CollectedHeap* _g1h; |
ysr@777 | 74 | Mutex _m; |
ysr@777 | 75 | HeapRegion* _hr; |
ysr@777 | 76 | |
ysr@777 | 77 | // These are protected by "_m". |
ysr@777 | 78 | BitMap _coarse_map; |
ysr@777 | 79 | size_t _n_coarse_entries; |
ysr@777 | 80 | static jint _n_coarsenings; |
ysr@777 | 81 | |
ysr@777 | 82 | PosParPRT** _fine_grain_regions; |
ysr@777 | 83 | size_t _n_fine_entries; |
ysr@777 | 84 | |
ysr@777 | 85 | #define SAMPLE_FOR_EVICTION 1 |
ysr@777 | 86 | #if SAMPLE_FOR_EVICTION |
ysr@777 | 87 | size_t _fine_eviction_start; |
ysr@777 | 88 | static size_t _fine_eviction_stride; |
ysr@777 | 89 | static size_t _fine_eviction_sample_size; |
ysr@777 | 90 | #endif |
ysr@777 | 91 | |
ysr@777 | 92 | SparsePRT _sparse_table; |
ysr@777 | 93 | |
ysr@777 | 94 | // These are static after init. |
ysr@777 | 95 | static size_t _max_fine_entries; |
ysr@777 | 96 | static size_t _mod_max_fine_entries_mask; |
ysr@777 | 97 | |
ysr@777 | 98 | // Requires "prt" to be the first element of the bucket list appropriate |
ysr@777 | 99 | // for "hr". If this list contains an entry for "hr", return it, |
ysr@777 | 100 | // otherwise return "NULL". |
ysr@777 | 101 | PosParPRT* find_region_table(size_t ind, HeapRegion* hr) const; |
ysr@777 | 102 | |
ysr@777 | 103 | // Find, delete, and return a candidate PosParPRT, if any exists, |
ysr@777 | 104 | // adding the deleted region to the coarse bitmap. Requires the caller |
ysr@777 | 105 | // to hold _m, and the fine-grain table to be full. |
ysr@777 | 106 | PosParPRT* delete_region_table(); |
ysr@777 | 107 | |
ysr@777 | 108 | // If a PRT for "hr" is in the bucket list indicated by "ind" (which must |
ysr@777 | 109 | // be the correct index for "hr"), delete it and return true; else return |
ysr@777 | 110 | // false. |
ysr@777 | 111 | bool del_single_region_table(size_t ind, HeapRegion* hr); |
ysr@777 | 112 | |
ysr@777 | 113 | static jint _cache_probes; |
ysr@777 | 114 | static jint _cache_hits; |
ysr@777 | 115 | |
ysr@777 | 116 | // Indexed by thread X heap region, to minimize thread contention. |
ysr@777 | 117 | static int** _from_card_cache; |
ysr@777 | 118 | static size_t _from_card_cache_max_regions; |
ysr@777 | 119 | static size_t _from_card_cache_mem_size; |
ysr@777 | 120 | |
ysr@777 | 121 | public: |
ysr@777 | 122 | OtherRegionsTable(HeapRegion* hr); |
ysr@777 | 123 | |
ysr@777 | 124 | HeapRegion* hr() const { return _hr; } |
ysr@777 | 125 | |
ysr@777 | 126 | // For now. Could "expand" some tables in the future, so that this made |
ysr@777 | 127 | // sense. |
ysr@1280 | 128 | void add_reference(OopOrNarrowOopStar from, int tid); |
ysr@777 | 129 | |
ysr@1280 | 130 | void add_reference(OopOrNarrowOopStar from) { |
ysr@777 | 131 | return add_reference(from, 0); |
ysr@777 | 132 | } |
ysr@777 | 133 | |
ysr@777 | 134 | // Removes any entries shown by the given bitmaps to contain only dead |
ysr@777 | 135 | // objects. |
ysr@777 | 136 | void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); |
ysr@777 | 137 | |
ysr@777 | 138 | // Not const because it takes a lock. |
ysr@777 | 139 | size_t occupied() const; |
ysr@777 | 140 | size_t occ_fine() const; |
ysr@777 | 141 | size_t occ_coarse() const; |
ysr@777 | 142 | size_t occ_sparse() const; |
ysr@777 | 143 | |
ysr@777 | 144 | static jint n_coarsenings() { return _n_coarsenings; } |
ysr@777 | 145 | |
ysr@777 | 146 | // Returns size in bytes. |
ysr@777 | 147 | // Not const because it takes a lock. |
ysr@777 | 148 | size_t mem_size() const; |
ysr@777 | 149 | static size_t static_mem_size(); |
ysr@777 | 150 | static size_t fl_mem_size(); |
ysr@777 | 151 | |
ysr@1280 | 152 | bool contains_reference(OopOrNarrowOopStar from) const; |
ysr@1280 | 153 | bool contains_reference_locked(OopOrNarrowOopStar from) const; |
ysr@777 | 154 | |
ysr@777 | 155 | void clear(); |
ysr@777 | 156 | |
ysr@777 | 157 | // Specifically clear the from_card_cache. |
ysr@777 | 158 | void clear_fcc(); |
ysr@777 | 159 | |
ysr@777 | 160 | // "from_hr" is being cleared; remove any entries from it. |
ysr@777 | 161 | void clear_incoming_entry(HeapRegion* from_hr); |
ysr@777 | 162 | |
tonyp@2493 | 163 | void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
tonyp@2493 | 164 | |
ysr@777 | 165 | // Declare the heap size (in # of regions) to the OtherRegionsTable. |
ysr@777 | 166 | // (Uses it to initialize from_card_cache). |
ysr@777 | 167 | static void init_from_card_cache(size_t max_regions); |
ysr@777 | 168 | |
ysr@777 | 169 | // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. |
ysr@777 | 170 | // Make sure any entries for higher regions are invalid. |
ysr@777 | 171 | static void shrink_from_card_cache(size_t new_n_regs); |
ysr@777 | 172 | |
ysr@777 | 173 | static void print_from_card_cache(); |
ysr@777 | 174 | }; |
ysr@777 | 175 | |
ysr@777 | 176 | class HeapRegionRemSet : public CHeapObj { |
ysr@777 | 177 | friend class VMStructs; |
ysr@777 | 178 | friend class HeapRegionRemSetIterator; |
ysr@777 | 179 | |
ysr@777 | 180 | public: |
ysr@777 | 181 | enum Event { |
ysr@777 | 182 | Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd |
ysr@777 | 183 | }; |
ysr@777 | 184 | |
ysr@777 | 185 | private: |
ysr@777 | 186 | G1BlockOffsetSharedArray* _bosa; |
ysr@777 | 187 | G1BlockOffsetSharedArray* bosa() const { return _bosa; } |
ysr@777 | 188 | |
ysr@777 | 189 | OtherRegionsTable _other_regions; |
ysr@777 | 190 | |
ysr@777 | 191 | enum ParIterState { Unclaimed, Claimed, Complete }; |
iveresov@1696 | 192 | volatile ParIterState _iter_state; |
iveresov@1696 | 193 | volatile jlong _iter_claimed; |
ysr@777 | 194 | |
ysr@777 | 195 | // Unused unless G1RecordHRRSOops is true. |
ysr@777 | 196 | |
ysr@777 | 197 | static const int MaxRecorded = 1000000; |
ysr@1280 | 198 | static OopOrNarrowOopStar* _recorded_oops; |
ysr@1280 | 199 | static HeapWord** _recorded_cards; |
ysr@1280 | 200 | static HeapRegion** _recorded_regions; |
ysr@1280 | 201 | static int _n_recorded; |
ysr@777 | 202 | |
ysr@777 | 203 | static const int MaxRecordedEvents = 1000; |
ysr@777 | 204 | static Event* _recorded_events; |
ysr@777 | 205 | static int* _recorded_event_index; |
ysr@777 | 206 | static int _n_recorded_events; |
ysr@777 | 207 | |
ysr@777 | 208 | static void print_event(outputStream* str, Event evnt); |
ysr@777 | 209 | |
ysr@777 | 210 | public: |
ysr@777 | 211 | HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, |
ysr@777 | 212 | HeapRegion* hr); |
ysr@777 | 213 | |
ysr@777 | 214 | static int num_par_rem_sets(); |
iveresov@1696 | 215 | static void setup_remset_size(); |
ysr@777 | 216 | |
ysr@777 | 217 | HeapRegion* hr() const { |
ysr@777 | 218 | return _other_regions.hr(); |
ysr@777 | 219 | } |
ysr@777 | 220 | |
ysr@777 | 221 | size_t occupied() const { |
ysr@777 | 222 | return _other_regions.occupied(); |
ysr@777 | 223 | } |
ysr@777 | 224 | size_t occ_fine() const { |
ysr@777 | 225 | return _other_regions.occ_fine(); |
ysr@777 | 226 | } |
ysr@777 | 227 | size_t occ_coarse() const { |
ysr@777 | 228 | return _other_regions.occ_coarse(); |
ysr@777 | 229 | } |
ysr@777 | 230 | size_t occ_sparse() const { |
ysr@777 | 231 | return _other_regions.occ_sparse(); |
ysr@777 | 232 | } |
ysr@777 | 233 | |
ysr@777 | 234 | static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } |
ysr@777 | 235 | |
ysr@777 | 236 | /* Used in the sequential case. Returns "true" iff this addition causes |
ysr@777 | 237 | the size limit to be reached. */ |
ysr@1280 | 238 | void add_reference(OopOrNarrowOopStar from) { |
ysr@777 | 239 | _other_regions.add_reference(from); |
ysr@777 | 240 | } |
ysr@777 | 241 | |
ysr@777 | 242 | /* Used in the parallel case. Returns "true" iff this addition causes |
ysr@777 | 243 | the size limit to be reached. */ |
ysr@1280 | 244 | void add_reference(OopOrNarrowOopStar from, int tid) { |
ysr@777 | 245 | _other_regions.add_reference(from, tid); |
ysr@777 | 246 | } |
ysr@777 | 247 | |
ysr@777 | 248 | // Removes any entries shown by the given bitmaps to contain only dead |
ysr@777 | 249 | // objects. |
ysr@777 | 250 | void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); |
ysr@777 | 251 | |
ysr@777 | 252 | // The region is being reclaimed; clear its remset, and any mention of |
ysr@777 | 253 | // entries for this region in other remsets. |
ysr@777 | 254 | void clear(); |
ysr@777 | 255 | |
ysr@777 | 256 | // Forget any entries due to pointers from "from_hr". |
ysr@777 | 257 | void clear_incoming_entry(HeapRegion* from_hr) { |
ysr@777 | 258 | _other_regions.clear_incoming_entry(from_hr); |
ysr@777 | 259 | } |
ysr@777 | 260 | |
ysr@777 | 261 | #if 0 |
ysr@777 | 262 | virtual void cleanup() = 0; |
ysr@777 | 263 | #endif |
ysr@777 | 264 | |
ysr@777 | 265 | // Attempt to claim the region. Returns true iff this call caused an |
ysr@777 | 266 | // atomic transition from Unclaimed to Claimed. |
ysr@777 | 267 | bool claim_iter(); |
ysr@777 | 268 | // Sets the iteration state to "complete". |
ysr@777 | 269 | void set_iter_complete(); |
ysr@777 | 270 | // Returns "true" iff the region's iteration is complete. |
ysr@777 | 271 | bool iter_is_complete(); |
ysr@777 | 272 | |
iveresov@1696 | 273 | // Support for claiming blocks of cards during iteration |
iveresov@1696 | 274 | size_t iter_claimed() const { return (size_t)_iter_claimed; } |
iveresov@1696 | 275 | // Claim the next block of cards |
iveresov@1696 | 276 | size_t iter_claimed_next(size_t step) { |
iveresov@1696 | 277 | size_t current, next; |
iveresov@1696 | 278 | do { |
iveresov@1696 | 279 | current = iter_claimed(); |
iveresov@1696 | 280 | next = current + step; |
iveresov@1696 | 281 | } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); |
iveresov@1696 | 282 | return current; |
iveresov@1696 | 283 | } |
tonyp@2974 | 284 | void reset_for_par_iteration(); |
tonyp@2974 | 285 | |
tonyp@2974 | 286 | bool verify_ready_for_par_iteration() { |
tonyp@2974 | 287 | return (_iter_state == Unclaimed) && (_iter_claimed == 0); |
tonyp@2974 | 288 | } |
iveresov@1696 | 289 | |
ysr@777 | 290 | // Initialize the given iterator to iterate over this rem set. |
ysr@777 | 291 | void init_iterator(HeapRegionRemSetIterator* iter) const; |
ysr@777 | 292 | |
ysr@777 | 293 | #if 0 |
ysr@777 | 294 | // Apply the "do_card" method to the start address of every card in the |
ysr@777 | 295 | // rem set. Returns false if some application of the closure aborted. |
ysr@777 | 296 | virtual bool card_iterate(CardClosure* iter) = 0; |
ysr@777 | 297 | #endif |
ysr@777 | 298 | |
ysr@777 | 299 | // The actual # of bytes this hr_remset takes up. |
ysr@777 | 300 | size_t mem_size() { |
ysr@777 | 301 | return _other_regions.mem_size() |
ysr@777 | 302 | // This correction is necessary because the above includes the second |
ysr@777 | 303 | // part. |
ysr@777 | 304 | + sizeof(this) - sizeof(OtherRegionsTable); |
ysr@777 | 305 | } |
ysr@777 | 306 | |
ysr@777 | 307 | // Returns the memory occupancy of all static data structures associated |
ysr@777 | 308 | // with remembered sets. |
ysr@777 | 309 | static size_t static_mem_size() { |
ysr@777 | 310 | return OtherRegionsTable::static_mem_size(); |
ysr@777 | 311 | } |
ysr@777 | 312 | |
ysr@777 | 313 | // Returns the memory occupancy of all free_list data structures associated |
ysr@777 | 314 | // with remembered sets. |
ysr@777 | 315 | static size_t fl_mem_size() { |
ysr@777 | 316 | return OtherRegionsTable::fl_mem_size(); |
ysr@777 | 317 | } |
ysr@777 | 318 | |
ysr@1280 | 319 | bool contains_reference(OopOrNarrowOopStar from) const { |
ysr@777 | 320 | return _other_regions.contains_reference(from); |
ysr@777 | 321 | } |
ysr@777 | 322 | void print() const; |
ysr@777 | 323 | |
ysr@777 | 324 | // Called during a stop-world phase to perform any deferred cleanups. |
ysr@777 | 325 | // The second version may be called by parallel threads after then finish |
ysr@777 | 326 | // collection work. |
ysr@777 | 327 | static void cleanup(); |
ysr@777 | 328 | static void par_cleanup(); |
ysr@777 | 329 | |
ysr@777 | 330 | // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). |
ysr@777 | 331 | // (Uses it to initialize from_card_cache). |
ysr@777 | 332 | static void init_heap(size_t max_regions) { |
ysr@777 | 333 | OtherRegionsTable::init_from_card_cache(max_regions); |
ysr@777 | 334 | } |
ysr@777 | 335 | |
ysr@777 | 336 | // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. |
ysr@777 | 337 | static void shrink_heap(size_t new_n_regs) { |
ysr@777 | 338 | OtherRegionsTable::shrink_from_card_cache(new_n_regs); |
ysr@777 | 339 | } |
ysr@777 | 340 | |
ysr@777 | 341 | #ifndef PRODUCT |
ysr@777 | 342 | static void print_from_card_cache() { |
ysr@777 | 343 | OtherRegionsTable::print_from_card_cache(); |
ysr@777 | 344 | } |
ysr@777 | 345 | #endif |
ysr@777 | 346 | |
ysr@1280 | 347 | static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
ysr@777 | 348 | static void print_recorded(); |
ysr@777 | 349 | static void record_event(Event evnt); |
ysr@777 | 350 | |
tonyp@2493 | 351 | // These are wrappers for the similarly-named methods on |
tonyp@2493 | 352 | // SparsePRT. Look at sparsePRT.hpp for more details. |
tonyp@2493 | 353 | static void reset_for_cleanup_tasks(); |
tonyp@2493 | 354 | void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
tonyp@2493 | 355 | static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); |
tonyp@2493 | 356 | |
ysr@777 | 357 | // Run unit tests. |
ysr@777 | 358 | #ifndef PRODUCT |
ysr@777 | 359 | static void test(); |
ysr@777 | 360 | #endif |
ysr@777 | 361 | }; |
ysr@777 | 362 | |
ysr@777 | 363 | class HeapRegionRemSetIterator : public CHeapObj { |
ysr@777 | 364 | |
ysr@777 | 365 | // The region over which we're iterating. |
ysr@777 | 366 | const HeapRegionRemSet* _hrrs; |
ysr@777 | 367 | |
ysr@777 | 368 | // Local caching of HRRS fields. |
ysr@777 | 369 | const BitMap* _coarse_map; |
ysr@777 | 370 | PosParPRT** _fine_grain_regions; |
ysr@777 | 371 | |
ysr@777 | 372 | G1BlockOffsetSharedArray* _bosa; |
ysr@777 | 373 | G1CollectedHeap* _g1h; |
ysr@777 | 374 | |
ysr@777 | 375 | // The number yielded since initialization. |
ysr@777 | 376 | size_t _n_yielded_fine; |
ysr@777 | 377 | size_t _n_yielded_coarse; |
ysr@777 | 378 | size_t _n_yielded_sparse; |
ysr@777 | 379 | |
ysr@777 | 380 | // If true we're iterating over the coarse table; if false the fine |
ysr@777 | 381 | // table. |
ysr@777 | 382 | enum IterState { |
ysr@777 | 383 | Sparse, |
ysr@777 | 384 | Fine, |
ysr@777 | 385 | Coarse |
ysr@777 | 386 | }; |
ysr@777 | 387 | IterState _is; |
ysr@777 | 388 | |
ysr@777 | 389 | // In both kinds of iteration, heap offset of first card of current |
ysr@777 | 390 | // region. |
ysr@777 | 391 | size_t _cur_region_card_offset; |
ysr@777 | 392 | // Card offset within cur region. |
ysr@777 | 393 | size_t _cur_region_cur_card; |
ysr@777 | 394 | |
ysr@777 | 395 | // Coarse table iteration fields: |
ysr@777 | 396 | |
ysr@777 | 397 | // Current region index; |
johnc@3182 | 398 | int _coarse_cur_region_index; |
johnc@3182 | 399 | size_t _coarse_cur_region_cur_card; |
ysr@777 | 400 | |
ysr@777 | 401 | bool coarse_has_next(size_t& card_index); |
ysr@777 | 402 | |
ysr@777 | 403 | // Fine table iteration fields: |
ysr@777 | 404 | |
ysr@777 | 405 | // Index of bucket-list we're working on. |
ysr@777 | 406 | int _fine_array_index; |
ysr@777 | 407 | // Per Region Table we're doing within current bucket list. |
ysr@777 | 408 | PosParPRT* _fine_cur_prt; |
ysr@777 | 409 | |
ysr@777 | 410 | /* SparsePRT::*/ SparsePRTIter _sparse_iter; |
ysr@777 | 411 | |
ysr@777 | 412 | void fine_find_next_non_null_prt(); |
ysr@777 | 413 | |
ysr@777 | 414 | bool fine_has_next(); |
ysr@777 | 415 | bool fine_has_next(size_t& card_index); |
ysr@777 | 416 | |
ysr@777 | 417 | public: |
ysr@777 | 418 | // We require an iterator to be initialized before use, so the |
ysr@777 | 419 | // constructor does little. |
ysr@777 | 420 | HeapRegionRemSetIterator(); |
ysr@777 | 421 | |
ysr@777 | 422 | void initialize(const HeapRegionRemSet* hrrs); |
ysr@777 | 423 | |
ysr@777 | 424 | // If there remains one or more cards to be yielded, returns true and |
ysr@777 | 425 | // sets "card_index" to one of those cards (which is then considered |
ysr@777 | 426 | // yielded.) Otherwise, returns false (and leaves "card_index" |
ysr@777 | 427 | // undefined.) |
ysr@777 | 428 | bool has_next(size_t& card_index); |
ysr@777 | 429 | |
ysr@777 | 430 | size_t n_yielded_fine() { return _n_yielded_fine; } |
ysr@777 | 431 | size_t n_yielded_coarse() { return _n_yielded_coarse; } |
ysr@777 | 432 | size_t n_yielded_sparse() { return _n_yielded_sparse; } |
ysr@777 | 433 | size_t n_yielded() { |
ysr@777 | 434 | return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); |
ysr@777 | 435 | } |
ysr@777 | 436 | }; |
ysr@777 | 437 | |
ysr@777 | 438 | #if 0 |
ysr@777 | 439 | class CardClosure: public Closure { |
ysr@777 | 440 | public: |
ysr@777 | 441 | virtual void do_card(HeapWord* card_start) = 0; |
ysr@777 | 442 | }; |
ysr@777 | 443 | |
ysr@777 | 444 | #endif |
stefank@2314 | 445 | |
stefank@2314 | 446 | #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |