Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 1550:c9a07413e82b
Merge
| author | jcoomes |
|---|---|
| date | Thu, 20 May 2010 08:32:11 -0700 |
| parents | fb57d4cf76c2 cc387008223e |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_heapRegion.cpp.incl" | |
| 27 | |
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28 int HeapRegion::LogOfHRGrainBytes = 0; |
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29 int HeapRegion::LogOfHRGrainWords = 0; |
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30 int HeapRegion::GrainBytes = 0; |
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31 int HeapRegion::GrainWords = 0; |
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32 int HeapRegion::CardsPerRegion = 0; |
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33 |
| 342 | 34 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, |
| 35 HeapRegion* hr, OopClosure* cl, | |
| 36 CardTableModRefBS::PrecisionStyle precision, | |
| 37 FilterKind fk) : | |
| 38 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
| 39 _hr(hr), _fk(fk), _g1(g1) | |
| 40 {} | |
| 41 | |
| 42 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
| 43 OopClosure* oc) : | |
| 44 _r_bottom(r->bottom()), _r_end(r->end()), | |
| 45 _oc(oc), _out_of_region(0) | |
| 46 {} | |
| 47 | |
| 48 class VerifyLiveClosure: public OopClosure { | |
| 811 | 49 private: |
| 342 | 50 G1CollectedHeap* _g1h; |
| 51 CardTableModRefBS* _bs; | |
| 52 oop _containing_obj; | |
| 53 bool _failures; | |
| 54 int _n_failures; | |
| 811 | 55 bool _use_prev_marking; |
| 342 | 56 public: |
| 811 | 57 // use_prev_marking == true -> use "prev" marking information, |
| 58 // use_prev_marking == false -> use "next" marking information | |
| 59 VerifyLiveClosure(G1CollectedHeap* g1h, bool use_prev_marking) : | |
| 342 | 60 _g1h(g1h), _bs(NULL), _containing_obj(NULL), |
| 811 | 61 _failures(false), _n_failures(0), _use_prev_marking(use_prev_marking) |
| 342 | 62 { |
| 63 BarrierSet* bs = _g1h->barrier_set(); | |
| 64 if (bs->is_a(BarrierSet::CardTableModRef)) | |
| 65 _bs = (CardTableModRefBS*)bs; | |
| 66 } | |
| 67 | |
| 68 void set_containing_obj(oop obj) { | |
| 69 _containing_obj = obj; | |
| 70 } | |
| 71 | |
| 72 bool failures() { return _failures; } | |
| 73 int n_failures() { return _n_failures; } | |
| 74 | |
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75 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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76 virtual void do_oop( oop* p) { do_oop_work(p); } |
| 342 | 77 |
| 1388 | 78 void print_object(outputStream* out, oop obj) { |
| 79 #ifdef PRODUCT | |
| 80 klassOop k = obj->klass(); | |
| 81 const char* class_name = instanceKlass::cast(k)->external_name(); | |
| 82 out->print_cr("class name %s", class_name); | |
| 83 #else // PRODUCT | |
| 84 obj->print_on(out); | |
| 85 #endif // PRODUCT | |
| 86 } | |
| 87 | |
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88 template <class T> void do_oop_work(T* p) { |
| 342 | 89 assert(_containing_obj != NULL, "Precondition"); |
| 811 | 90 assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking), |
| 91 "Precondition"); | |
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92 T heap_oop = oopDesc::load_heap_oop(p); |
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93 if (!oopDesc::is_null(heap_oop)) { |
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94 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
| 342 | 95 bool failed = false; |
| 811 | 96 if (!_g1h->is_in_closed_subset(obj) || |
| 97 _g1h->is_obj_dead_cond(obj, _use_prev_marking)) { | |
| 342 | 98 if (!_failures) { |
| 99 gclog_or_tty->print_cr(""); | |
| 100 gclog_or_tty->print_cr("----------"); | |
| 101 } | |
| 102 if (!_g1h->is_in_closed_subset(obj)) { | |
| 1388 | 103 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
| 342 | 104 gclog_or_tty->print_cr("Field "PTR_FORMAT |
| 1388 | 105 " of live obj "PTR_FORMAT" in region " |
| 106 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 107 p, (void*) _containing_obj, | |
| 108 from->bottom(), from->end()); | |
| 109 print_object(gclog_or_tty, _containing_obj); | |
| 110 gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap", | |
| 111 (void*) obj); | |
| 112 } else { | |
| 113 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); | |
| 114 HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj); | |
| 115 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 116 " of live obj "PTR_FORMAT" in region " | |
| 117 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 118 p, (void*) _containing_obj, | |
| 119 from->bottom(), from->end()); | |
| 120 print_object(gclog_or_tty, _containing_obj); | |
| 121 gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region " | |
| 122 "["PTR_FORMAT", "PTR_FORMAT")", | |
| 123 (void*) obj, to->bottom(), to->end()); | |
| 124 print_object(gclog_or_tty, obj); | |
| 342 | 125 } |
| 126 gclog_or_tty->print_cr("----------"); | |
| 127 _failures = true; | |
| 128 failed = true; | |
| 129 _n_failures++; | |
| 130 } | |
| 131 | |
| 132 if (!_g1h->full_collection()) { | |
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133 HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); |
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134 HeapRegion* to = _g1h->heap_region_containing(obj); |
| 342 | 135 if (from != NULL && to != NULL && |
| 136 from != to && | |
| 137 !to->isHumongous()) { | |
| 138 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
| 139 jbyte cv_field = *_bs->byte_for_const(p); | |
| 140 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
| 141 | |
| 142 bool is_bad = !(from->is_young() | |
| 143 || to->rem_set()->contains_reference(p) | |
| 144 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
| 145 (_containing_obj->is_objArray() ? | |
| 146 cv_field == dirty | |
| 147 : cv_obj == dirty || cv_field == dirty)); | |
| 148 if (is_bad) { | |
| 149 if (!_failures) { | |
| 150 gclog_or_tty->print_cr(""); | |
| 151 gclog_or_tty->print_cr("----------"); | |
| 152 } | |
| 153 gclog_or_tty->print_cr("Missing rem set entry:"); | |
| 154 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
| 155 " of obj "PTR_FORMAT | |
| 156 ", in region %d ["PTR_FORMAT | |
| 157 ", "PTR_FORMAT"),", | |
| 158 p, (void*) _containing_obj, | |
| 159 from->hrs_index(), | |
| 160 from->bottom(), | |
| 161 from->end()); | |
| 162 _containing_obj->print_on(gclog_or_tty); | |
| 163 gclog_or_tty->print_cr("points to obj "PTR_FORMAT | |
| 164 " in region %d ["PTR_FORMAT | |
| 165 ", "PTR_FORMAT").", | |
| 166 (void*) obj, to->hrs_index(), | |
| 167 to->bottom(), to->end()); | |
| 168 obj->print_on(gclog_or_tty); | |
| 169 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
| 170 cv_obj, cv_field); | |
| 171 gclog_or_tty->print_cr("----------"); | |
| 172 _failures = true; | |
| 173 if (!failed) _n_failures++; | |
| 174 } | |
| 175 } | |
| 176 } | |
| 177 } | |
| 178 } | |
| 179 }; | |
| 180 | |
| 181 template<class ClosureType> | |
| 182 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
| 183 HeapRegion* hr, | |
| 184 HeapWord* cur, HeapWord* top) { | |
| 185 oop cur_oop = oop(cur); | |
| 186 int oop_size = cur_oop->size(); | |
| 187 HeapWord* next_obj = cur + oop_size; | |
| 188 while (next_obj < top) { | |
| 189 // Keep filtering the remembered set. | |
| 190 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
| 191 // Bottom lies entirely below top, so we can call the | |
| 192 // non-memRegion version of oop_iterate below. | |
| 193 cur_oop->oop_iterate(cl); | |
| 194 } | |
| 195 cur = next_obj; | |
| 196 cur_oop = oop(cur); | |
| 197 oop_size = cur_oop->size(); | |
| 198 next_obj = cur + oop_size; | |
| 199 } | |
| 200 return cur; | |
| 201 } | |
| 202 | |
| 203 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
| 204 HeapWord* bottom, | |
| 205 HeapWord* top, | |
| 206 OopClosure* cl) { | |
| 207 G1CollectedHeap* g1h = _g1; | |
| 208 | |
| 209 int oop_size; | |
| 210 | |
| 211 OopClosure* cl2 = cl; | |
| 212 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
| 213 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
| 214 switch (_fk) { | |
| 215 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
| 216 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
| 217 } | |
| 218 | |
| 219 // Start filtering what we add to the remembered set. If the object is | |
| 220 // not considered dead, either because it is marked (in the mark bitmap) | |
| 221 // or it was allocated after marking finished, then we add it. Otherwise | |
| 222 // we can safely ignore the object. | |
| 223 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 224 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
| 225 } else { | |
| 226 oop_size = oop(bottom)->size(); | |
| 227 } | |
| 228 | |
| 229 bottom += oop_size; | |
| 230 | |
| 231 if (bottom < top) { | |
| 232 // We replicate the loop below for several kinds of possible filters. | |
| 233 switch (_fk) { | |
| 234 case NoFilterKind: | |
| 235 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
| 236 break; | |
| 237 case IntoCSFilterKind: { | |
| 238 FilterIntoCSClosure filt(this, g1h, cl); | |
| 239 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 240 break; | |
| 241 } | |
| 242 case OutOfRegionFilterKind: { | |
| 243 FilterOutOfRegionClosure filt(_hr, cl); | |
| 244 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
| 245 break; | |
| 246 } | |
| 247 default: | |
| 248 ShouldNotReachHere(); | |
| 249 } | |
| 250 | |
| 251 // Last object. Need to do dead-obj filtering here too. | |
| 252 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
| 253 oop(bottom)->oop_iterate(cl2, mr); | |
| 254 } | |
| 255 } | |
| 256 } | |
| 257 | |
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258 // Minimum region size; we won't go lower than that. |
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259 // We might want to decrease this in the future, to deal with small |
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260 // heaps a bit more efficiently. |
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261 #define MIN_REGION_SIZE ( 1024 * 1024 ) |
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262 |
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263 // Maximum region size; we don't go higher than that. There's a good |
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264 // reason for having an upper bound. We don't want regions to get too |
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265 // large, otherwise cleanup's effectiveness would decrease as there |
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266 // will be fewer opportunities to find totally empty regions after |
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267 // marking. |
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268 #define MAX_REGION_SIZE ( 32 * 1024 * 1024 ) |
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269 |
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270 // The automatic region size calculation will try to have around this |
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271 // many regions in the heap (based on the min heap size). |
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272 #define TARGET_REGION_NUMBER 2048 |
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273 |
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274 void HeapRegion::setup_heap_region_size(uintx min_heap_size) { |
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275 // region_size in bytes |
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276 uintx region_size = G1HeapRegionSize; |
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277 if (FLAG_IS_DEFAULT(G1HeapRegionSize)) { |
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278 // We base the automatic calculation on the min heap size. This |
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279 // can be problematic if the spread between min and max is quite |
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280 // wide, imagine -Xms128m -Xmx32g. But, if we decided it based on |
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281 // the max size, the region size might be way too large for the |
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282 // min size. Either way, some users might have to set the region |
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283 // size manually for some -Xms / -Xmx combos. |
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284 |
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285 region_size = MAX2(min_heap_size / TARGET_REGION_NUMBER, |
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286 (uintx) MIN_REGION_SIZE); |
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287 } |
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288 |
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289 int region_size_log = log2_long((jlong) region_size); |
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290 // Recalculate the region size to make sure it's a power of |
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291 // 2. This means that region_size is the largest power of 2 that's |
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292 // <= what we've calculated so far. |
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293 region_size = ((uintx)1 << region_size_log); |
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294 |
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295 // Now make sure that we don't go over or under our limits. |
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296 if (region_size < MIN_REGION_SIZE) { |
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297 region_size = MIN_REGION_SIZE; |
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298 } else if (region_size > MAX_REGION_SIZE) { |
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299 region_size = MAX_REGION_SIZE; |
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300 } |
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301 |
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302 // And recalculate the log. |
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303 region_size_log = log2_long((jlong) region_size); |
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304 |
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305 // Now, set up the globals. |
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306 guarantee(LogOfHRGrainBytes == 0, "we should only set it once"); |
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307 LogOfHRGrainBytes = region_size_log; |
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308 |
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309 guarantee(LogOfHRGrainWords == 0, "we should only set it once"); |
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310 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize; |
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311 |
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312 guarantee(GrainBytes == 0, "we should only set it once"); |
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313 // The cast to int is safe, given that we've bounded region_size by |
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314 // MIN_REGION_SIZE and MAX_REGION_SIZE. |
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315 GrainBytes = (int) region_size; |
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316 |
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317 guarantee(GrainWords == 0, "we should only set it once"); |
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318 GrainWords = GrainBytes >> LogHeapWordSize; |
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319 guarantee(1 << LogOfHRGrainWords == GrainWords, "sanity"); |
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320 |
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321 guarantee(CardsPerRegion == 0, "we should only set it once"); |
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322 CardsPerRegion = GrainBytes >> CardTableModRefBS::card_shift; |
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323 } |
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324 |
| 342 | 325 void HeapRegion::reset_after_compaction() { |
| 326 G1OffsetTableContigSpace::reset_after_compaction(); | |
| 327 // After a compaction the mark bitmap is invalid, so we must | |
| 328 // treat all objects as being inside the unmarked area. | |
| 329 zero_marked_bytes(); | |
| 330 init_top_at_mark_start(); | |
| 331 } | |
| 332 | |
| 333 DirtyCardToOopClosure* | |
| 334 HeapRegion::new_dcto_closure(OopClosure* cl, | |
| 335 CardTableModRefBS::PrecisionStyle precision, | |
| 336 HeapRegionDCTOC::FilterKind fk) { | |
| 337 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
| 338 this, cl, precision, fk); | |
| 339 } | |
| 340 | |
| 341 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
| 355 | 342 _humongous_type = NotHumongous; |
| 342 | 343 _humongous_start_region = NULL; |
| 344 _in_collection_set = false; | |
| 345 _is_gc_alloc_region = false; | |
| 346 | |
| 347 // Age stuff (if parallel, this will be done separately, since it needs | |
| 348 // to be sequential). | |
| 349 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 350 | |
| 351 set_young_index_in_cset(-1); | |
| 352 uninstall_surv_rate_group(); | |
| 353 set_young_type(NotYoung); | |
| 354 | |
| 355 // In case it had been the start of a humongous sequence, reset its end. | |
| 356 set_end(_orig_end); | |
| 357 | |
| 358 if (!par) { | |
| 359 // If this is parallel, this will be done later. | |
| 360 HeapRegionRemSet* hrrs = rem_set(); | |
| 361 if (hrrs != NULL) hrrs->clear(); | |
| 355 | 362 _claimed = InitialClaimValue; |
| 342 | 363 } |
| 364 zero_marked_bytes(); | |
| 365 set_sort_index(-1); | |
| 366 | |
| 367 _offsets.resize(HeapRegion::GrainWords); | |
| 368 init_top_at_mark_start(); | |
| 356 | 369 if (clear_space) clear(SpaceDecorator::Mangle); |
| 342 | 370 } |
| 371 | |
| 372 // <PREDICTION> | |
| 373 void HeapRegion::calc_gc_efficiency() { | |
| 374 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 375 _gc_efficiency = (double) garbage_bytes() / | |
| 376 g1h->predict_region_elapsed_time_ms(this, false); | |
| 377 } | |
| 378 // </PREDICTION> | |
| 379 | |
| 380 void HeapRegion::set_startsHumongous() { | |
| 355 | 381 _humongous_type = StartsHumongous; |
| 342 | 382 _humongous_start_region = this; |
| 383 assert(end() == _orig_end, "Should be normal before alloc."); | |
| 384 } | |
| 385 | |
| 386 bool HeapRegion::claimHeapRegion(jint claimValue) { | |
| 387 jint current = _claimed; | |
| 388 if (current != claimValue) { | |
| 389 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
| 390 if (res == current) { | |
| 391 return true; | |
| 392 } | |
| 393 } | |
| 394 return false; | |
| 395 } | |
| 396 | |
| 397 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
| 398 HeapWord* low = addr; | |
| 399 HeapWord* high = end(); | |
| 400 while (low < high) { | |
| 401 size_t diff = pointer_delta(high, low); | |
| 402 // Must add one below to bias toward the high amount. Otherwise, if | |
| 403 // "high" were at the desired value, and "low" were one less, we | |
| 404 // would not converge on "high". This is not symmetric, because | |
| 405 // we set "high" to a block start, which might be the right one, | |
| 406 // which we don't do for "low". | |
| 407 HeapWord* middle = low + (diff+1)/2; | |
| 408 if (middle == high) return high; | |
| 409 HeapWord* mid_bs = block_start_careful(middle); | |
| 410 if (mid_bs < addr) { | |
| 411 low = middle; | |
| 412 } else { | |
| 413 high = mid_bs; | |
| 414 } | |
| 415 } | |
| 416 assert(low == high && low >= addr, "Didn't work."); | |
| 417 return low; | |
| 418 } | |
| 419 | |
| 420 void HeapRegion::set_next_on_unclean_list(HeapRegion* r) { | |
| 421 assert(r == NULL || r->is_on_unclean_list(), "Malformed unclean list."); | |
| 422 _next_in_special_set = r; | |
| 423 } | |
| 424 | |
| 425 void HeapRegion::set_on_unclean_list(bool b) { | |
| 426 _is_on_unclean_list = b; | |
| 427 } | |
| 428 | |
| 356 | 429 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 430 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
| 342 | 431 hr_clear(false/*par*/, clear_space); |
| 432 } | |
| 433 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
| 434 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 435 #endif // _MSC_VER | |
| 436 | |
| 437 | |
| 438 HeapRegion:: | |
| 439 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 440 MemRegion mr, bool is_zeroed) | |
| 441 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), | |
| 442 _next_fk(HeapRegionDCTOC::NoFilterKind), | |
| 443 _hrs_index(-1), | |
| 355 | 444 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
| 342 | 445 _in_collection_set(false), _is_gc_alloc_region(false), |
| 446 _is_on_free_list(false), _is_on_unclean_list(false), | |
| 447 _next_in_special_set(NULL), _orig_end(NULL), | |
| 355 | 448 _claimed(InitialClaimValue), _evacuation_failed(false), |
| 342 | 449 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
| 450 _young_type(NotYoung), _next_young_region(NULL), | |
|
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451 _next_dirty_cards_region(NULL), |
| 342 | 452 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), |
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453 _rem_set(NULL), _zfs(NotZeroFilled), |
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454 _recorded_rs_length(0), _predicted_elapsed_time_ms(0), |
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455 _predicted_bytes_to_copy(0) |
| 342 | 456 { |
| 457 _orig_end = mr.end(); | |
| 458 // Note that initialize() will set the start of the unmarked area of the | |
| 459 // region. | |
| 356 | 460 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 461 set_top(bottom()); | |
| 462 set_saved_mark(); | |
| 342 | 463 |
| 464 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
| 465 | |
| 466 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
| 467 // In case the region is allocated during a pause, note the top. | |
| 468 // We haven't done any counting on a brand new region. | |
| 469 _top_at_conc_mark_count = bottom(); | |
| 470 } | |
| 471 | |
| 472 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
| 473 const HeapRegion* _target; | |
| 474 bool _target_seen; | |
| 475 HeapRegion* _last; | |
| 476 CompactibleSpace* _res; | |
| 477 public: | |
| 478 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
| 479 _target(target), _target_seen(false), _res(NULL) {} | |
| 480 bool doHeapRegion(HeapRegion* cur) { | |
| 481 if (_target_seen) { | |
| 482 if (!cur->isHumongous()) { | |
| 483 _res = cur; | |
| 484 return true; | |
| 485 } | |
| 486 } else if (cur == _target) { | |
| 487 _target_seen = true; | |
| 488 } | |
| 489 return false; | |
| 490 } | |
| 491 CompactibleSpace* result() { return _res; } | |
| 492 }; | |
| 493 | |
| 494 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
| 495 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 496 // cast away const-ness | |
| 497 HeapRegion* r = (HeapRegion*) this; | |
| 498 NextCompactionHeapRegionClosure blk(r); | |
| 499 g1h->heap_region_iterate_from(r, &blk); | |
| 500 return blk.result(); | |
| 501 } | |
| 502 | |
| 503 void HeapRegion::set_continuesHumongous(HeapRegion* start) { | |
| 504 // The order is important here. | |
| 505 start->add_continuingHumongousRegion(this); | |
| 355 | 506 _humongous_type = ContinuesHumongous; |
| 342 | 507 _humongous_start_region = start; |
| 508 } | |
| 509 | |
| 510 void HeapRegion::add_continuingHumongousRegion(HeapRegion* cont) { | |
| 511 // Must join the blocks of the current H region seq with the block of the | |
| 512 // added region. | |
| 513 offsets()->join_blocks(bottom(), cont->bottom()); | |
| 514 arrayOop obj = (arrayOop)(bottom()); | |
| 515 obj->set_length((int) (obj->length() + cont->capacity()/jintSize)); | |
| 516 set_end(cont->end()); | |
| 517 set_top(cont->end()); | |
| 518 } | |
| 519 | |
| 520 void HeapRegion::save_marks() { | |
| 521 set_saved_mark(); | |
| 522 } | |
| 523 | |
| 524 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
| 525 HeapWord* p = mr.start(); | |
| 526 HeapWord* e = mr.end(); | |
| 527 oop obj; | |
| 528 while (p < e) { | |
| 529 obj = oop(p); | |
| 530 p += obj->oop_iterate(cl); | |
| 531 } | |
| 532 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
| 533 } | |
| 534 | |
| 535 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
| 536 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
| 537 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
| 538 } | |
| 539 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
| 540 | |
| 541 | |
| 542 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
| 543 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
| 544 } | |
| 545 | |
| 546 #ifdef DEBUG | |
| 547 HeapWord* HeapRegion::allocate(size_t size) { | |
| 548 jint state = zero_fill_state(); | |
| 549 assert(!G1CollectedHeap::heap()->allocs_are_zero_filled() || | |
| 550 zero_fill_is_allocated(), | |
| 551 "When ZF is on, only alloc in ZF'd regions"); | |
| 552 return G1OffsetTableContigSpace::allocate(size); | |
| 553 } | |
| 554 #endif | |
| 555 | |
| 556 void HeapRegion::set_zero_fill_state_work(ZeroFillState zfs) { | |
| 557 assert(ZF_mon->owned_by_self() || | |
| 558 Universe::heap()->is_gc_active(), | |
| 559 "Must hold the lock or be a full GC to modify."); | |
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560 #ifdef ASSERT |
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561 if (top() != bottom() && zfs != Allocated) { |
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562 ResourceMark rm; |
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563 stringStream region_str; |
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564 print_on(®ion_str); |
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565 assert(top() == bottom() || zfs == Allocated, |
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566 err_msg("Region must be empty, or we must be setting it to allocated. " |
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567 "_zfs=%d, zfs=%d, region: %s", _zfs, zfs, region_str.as_string())); |
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568 } |
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569 #endif |
| 342 | 570 _zfs = zfs; |
| 571 } | |
| 572 | |
| 573 void HeapRegion::set_zero_fill_complete() { | |
| 574 set_zero_fill_state_work(ZeroFilled); | |
| 575 if (ZF_mon->owned_by_self()) { | |
| 576 ZF_mon->notify_all(); | |
| 577 } | |
| 578 } | |
| 579 | |
| 580 | |
| 581 void HeapRegion::ensure_zero_filled() { | |
| 582 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
| 583 ensure_zero_filled_locked(); | |
| 584 } | |
| 585 | |
| 586 void HeapRegion::ensure_zero_filled_locked() { | |
| 587 assert(ZF_mon->owned_by_self(), "Precondition"); | |
| 588 bool should_ignore_zf = SafepointSynchronize::is_at_safepoint(); | |
| 589 assert(should_ignore_zf || Heap_lock->is_locked(), | |
| 590 "Either we're in a GC or we're allocating a region."); | |
| 591 switch (zero_fill_state()) { | |
| 592 case HeapRegion::NotZeroFilled: | |
| 593 set_zero_fill_in_progress(Thread::current()); | |
| 594 { | |
| 595 ZF_mon->unlock(); | |
| 596 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
| 597 ZF_mon->lock_without_safepoint_check(); | |
| 598 } | |
| 599 // A trap. | |
| 600 guarantee(zero_fill_state() == HeapRegion::ZeroFilling | |
| 601 && zero_filler() == Thread::current(), | |
| 602 "AHA! Tell Dave D if you see this..."); | |
| 603 set_zero_fill_complete(); | |
| 604 // gclog_or_tty->print_cr("Did sync ZF."); | |
| 605 ConcurrentZFThread::note_sync_zfs(); | |
| 606 break; | |
| 607 case HeapRegion::ZeroFilling: | |
| 608 if (should_ignore_zf) { | |
| 609 // We can "break" the lock and take over the work. | |
| 610 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
| 611 set_zero_fill_complete(); | |
| 612 ConcurrentZFThread::note_sync_zfs(); | |
| 613 break; | |
| 614 } else { | |
| 615 ConcurrentZFThread::wait_for_ZF_completed(this); | |
| 616 } | |
| 617 case HeapRegion::ZeroFilled: | |
| 618 // Nothing to do. | |
| 619 break; | |
| 620 case HeapRegion::Allocated: | |
| 621 guarantee(false, "Should not call on allocated regions."); | |
| 622 } | |
| 623 assert(zero_fill_state() == HeapRegion::ZeroFilled, "Post"); | |
| 624 } | |
| 625 | |
| 626 HeapWord* | |
| 627 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
| 628 ObjectClosure* cl) { | |
| 629 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 630 // We used to use "block_start_careful" here. But we're actually happy | |
| 631 // to update the BOT while we do this... | |
| 632 HeapWord* cur = block_start(mr.start()); | |
| 633 mr = mr.intersection(used_region()); | |
| 634 if (mr.is_empty()) return NULL; | |
| 635 // Otherwise, find the obj that extends onto mr.start(). | |
| 636 | |
| 637 assert(cur <= mr.start() | |
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638 && (oop(cur)->klass_or_null() == NULL || |
| 342 | 639 cur + oop(cur)->size() > mr.start()), |
| 640 "postcondition of block_start"); | |
| 641 oop obj; | |
| 642 while (cur < mr.end()) { | |
| 643 obj = oop(cur); | |
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644 if (obj->klass_or_null() == NULL) { |
| 342 | 645 // Ran into an unparseable point. |
| 646 return cur; | |
| 647 } else if (!g1h->is_obj_dead(obj)) { | |
| 648 cl->do_object(obj); | |
| 649 } | |
| 650 if (cl->abort()) return cur; | |
| 651 // The check above must occur before the operation below, since an | |
| 652 // abort might invalidate the "size" operation. | |
| 653 cur += obj->size(); | |
| 654 } | |
| 655 return NULL; | |
| 656 } | |
| 657 | |
| 658 HeapWord* | |
| 659 HeapRegion:: | |
| 660 oops_on_card_seq_iterate_careful(MemRegion mr, | |
| 661 FilterOutOfRegionClosure* cl) { | |
| 662 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 663 | |
| 664 // If we're within a stop-world GC, then we might look at a card in a | |
| 665 // GC alloc region that extends onto a GC LAB, which may not be | |
| 666 // parseable. Stop such at the "saved_mark" of the region. | |
| 667 if (G1CollectedHeap::heap()->is_gc_active()) { | |
| 668 mr = mr.intersection(used_region_at_save_marks()); | |
| 669 } else { | |
| 670 mr = mr.intersection(used_region()); | |
| 671 } | |
| 672 if (mr.is_empty()) return NULL; | |
| 673 // Otherwise, find the obj that extends onto mr.start(). | |
| 674 | |
| 675 // We used to use "block_start_careful" here. But we're actually happy | |
| 676 // to update the BOT while we do this... | |
| 677 HeapWord* cur = block_start(mr.start()); | |
| 678 assert(cur <= mr.start(), "Postcondition"); | |
| 679 | |
| 680 while (cur <= mr.start()) { | |
|
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681 if (oop(cur)->klass_or_null() == NULL) { |
| 342 | 682 // Ran into an unparseable point. |
| 683 return cur; | |
| 684 } | |
| 685 // Otherwise... | |
| 686 int sz = oop(cur)->size(); | |
| 687 if (cur + sz > mr.start()) break; | |
| 688 // Otherwise, go on. | |
| 689 cur = cur + sz; | |
| 690 } | |
| 691 oop obj; | |
| 692 obj = oop(cur); | |
| 693 // If we finish this loop... | |
| 694 assert(cur <= mr.start() | |
|
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695 && obj->klass_or_null() != NULL |
| 342 | 696 && cur + obj->size() > mr.start(), |
| 697 "Loop postcondition"); | |
| 698 if (!g1h->is_obj_dead(obj)) { | |
| 699 obj->oop_iterate(cl, mr); | |
| 700 } | |
| 701 | |
| 702 HeapWord* next; | |
| 703 while (cur < mr.end()) { | |
| 704 obj = oop(cur); | |
|
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705 if (obj->klass_or_null() == NULL) { |
| 342 | 706 // Ran into an unparseable point. |
| 707 return cur; | |
| 708 }; | |
| 709 // Otherwise: | |
| 710 next = (cur + obj->size()); | |
| 711 if (!g1h->is_obj_dead(obj)) { | |
| 712 if (next < mr.end()) { | |
| 713 obj->oop_iterate(cl); | |
| 714 } else { | |
| 715 // this obj spans the boundary. If it's an array, stop at the | |
| 716 // boundary. | |
| 717 if (obj->is_objArray()) { | |
| 718 obj->oop_iterate(cl, mr); | |
| 719 } else { | |
| 720 obj->oop_iterate(cl); | |
| 721 } | |
| 722 } | |
| 723 } | |
| 724 cur = next; | |
| 725 } | |
| 726 return NULL; | |
| 727 } | |
| 728 | |
| 729 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
| 730 void HeapRegion::print_on(outputStream* st) const { | |
| 731 if (isHumongous()) { | |
| 732 if (startsHumongous()) | |
| 733 st->print(" HS"); | |
| 734 else | |
| 735 st->print(" HC"); | |
| 736 } else { | |
| 737 st->print(" "); | |
| 738 } | |
| 739 if (in_collection_set()) | |
| 740 st->print(" CS"); | |
| 741 else if (is_gc_alloc_region()) | |
| 742 st->print(" A "); | |
| 743 else | |
| 744 st->print(" "); | |
| 745 if (is_young()) | |
|
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746 st->print(is_survivor() ? " SU" : " Y "); |
| 342 | 747 else |
| 748 st->print(" "); | |
| 749 if (is_empty()) | |
| 750 st->print(" F"); | |
| 751 else | |
| 752 st->print(" "); | |
|
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753 st->print(" %5d", _gc_time_stamp); |
| 1388 | 754 st->print(" PTAMS "PTR_FORMAT" NTAMS "PTR_FORMAT, |
| 755 prev_top_at_mark_start(), next_top_at_mark_start()); | |
| 342 | 756 G1OffsetTableContigSpace::print_on(st); |
| 757 } | |
| 758 | |
| 811 | 759 void HeapRegion::verify(bool allow_dirty) const { |
|
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760 bool dummy = false; |
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761 verify(allow_dirty, /* use_prev_marking */ true, /* failures */ &dummy); |
| 811 | 762 } |
| 763 | |
| 342 | 764 #define OBJ_SAMPLE_INTERVAL 0 |
| 765 #define BLOCK_SAMPLE_INTERVAL 100 | |
| 766 | |
| 767 // This really ought to be commoned up into OffsetTableContigSpace somehow. | |
| 768 // We would need a mechanism to make that code skip dead objects. | |
| 769 | |
|
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770 void HeapRegion::verify(bool allow_dirty, |
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771 bool use_prev_marking, |
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772 bool* failures) const { |
| 342 | 773 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
|
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774 *failures = false; |
| 342 | 775 HeapWord* p = bottom(); |
| 776 HeapWord* prev_p = NULL; | |
| 777 int objs = 0; | |
| 778 int blocks = 0; | |
| 811 | 779 VerifyLiveClosure vl_cl(g1, use_prev_marking); |
| 342 | 780 while (p < top()) { |
| 781 size_t size = oop(p)->size(); | |
| 782 if (blocks == BLOCK_SAMPLE_INTERVAL) { | |
|
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783 HeapWord* res = block_start_const(p + (size/2)); |
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784 if (p != res) { |
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785 gclog_or_tty->print_cr("offset computation 1 for "PTR_FORMAT" and " |
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786 SIZE_FORMAT" returned "PTR_FORMAT, |
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787 p, size, res); |
|
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788 *failures = true; |
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|
789 return; |
|
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|
790 } |
| 342 | 791 blocks = 0; |
| 792 } else { | |
| 793 blocks++; | |
| 794 } | |
| 795 if (objs == OBJ_SAMPLE_INTERVAL) { | |
| 796 oop obj = oop(p); | |
| 811 | 797 if (!g1->is_obj_dead_cond(obj, this, use_prev_marking)) { |
|
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798 if (obj->is_oop()) { |
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799 klassOop klass = obj->klass(); |
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800 if (!klass->is_perm()) { |
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801 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
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802 "not in perm", klass, obj); |
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803 *failures = true; |
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804 return; |
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805 } else if (!klass->is_klass()) { |
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806 gclog_or_tty->print_cr("klass "PTR_FORMAT" of object "PTR_FORMAT" " |
|
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807 "not a klass", klass, obj); |
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808 *failures = true; |
|
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809 return; |
|
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810 } else { |
|
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811 vl_cl.set_containing_obj(obj); |
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812 obj->oop_iterate(&vl_cl); |
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813 if (vl_cl.failures()) { |
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814 *failures = true; |
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|
815 } |
|
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816 if (G1MaxVerifyFailures >= 0 && |
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817 vl_cl.n_failures() >= G1MaxVerifyFailures) { |
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818 return; |
|
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|
819 } |
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|
820 } |
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|
821 } else { |
|
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822 gclog_or_tty->print_cr(PTR_FORMAT" no an oop", obj); |
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823 *failures = true; |
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|
824 return; |
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|
825 } |
| 342 | 826 } |
| 827 objs = 0; | |
| 828 } else { | |
| 829 objs++; | |
| 830 } | |
| 831 prev_p = p; | |
| 832 p += size; | |
| 833 } | |
| 834 HeapWord* rend = end(); | |
| 835 HeapWord* rtop = top(); | |
| 836 if (rtop < rend) { | |
|
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837 HeapWord* res = block_start_const(rtop + (rend - rtop) / 2); |
|
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838 if (res != rtop) { |
|
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|
839 gclog_or_tty->print_cr("offset computation 2 for "PTR_FORMAT" and " |
|
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|
840 PTR_FORMAT" returned "PTR_FORMAT, |
|
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|
841 rtop, rend, res); |
|
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|
842 *failures = true; |
|
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|
843 return; |
|
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|
844 } |
| 342 | 845 } |
|
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|
846 |
|
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847 if (p != top()) { |
|
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|
848 gclog_or_tty->print_cr("end of last object "PTR_FORMAT" " |
|
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849 "does not match top "PTR_FORMAT, p, top()); |
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850 *failures = true; |
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|
851 return; |
| 342 | 852 } |
| 853 } | |
| 854 | |
| 855 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
| 856 // away eventually. | |
| 857 | |
| 356 | 858 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
| 342 | 859 // false ==> we'll do the clearing if there's clearing to be done. |
| 356 | 860 ContiguousSpace::initialize(mr, false, mangle_space); |
| 342 | 861 _offsets.zero_bottom_entry(); |
| 862 _offsets.initialize_threshold(); | |
| 356 | 863 if (clear_space) clear(mangle_space); |
| 342 | 864 } |
| 865 | |
| 356 | 866 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
| 867 ContiguousSpace::clear(mangle_space); | |
| 342 | 868 _offsets.zero_bottom_entry(); |
| 869 _offsets.initialize_threshold(); | |
| 870 } | |
| 871 | |
| 872 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
| 873 Space::set_bottom(new_bottom); | |
| 874 _offsets.set_bottom(new_bottom); | |
| 875 } | |
| 876 | |
| 877 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
| 878 Space::set_end(new_end); | |
| 879 _offsets.resize(new_end - bottom()); | |
| 880 } | |
| 881 | |
| 882 void G1OffsetTableContigSpace::print() const { | |
| 883 print_short(); | |
| 884 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
| 885 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 886 bottom(), top(), _offsets.threshold(), end()); | |
| 887 } | |
| 888 | |
| 889 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
| 890 return _offsets.initialize_threshold(); | |
| 891 } | |
| 892 | |
| 893 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
| 894 HeapWord* end) { | |
| 895 _offsets.alloc_block(start, end); | |
| 896 return _offsets.threshold(); | |
| 897 } | |
| 898 | |
| 899 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
| 900 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 901 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
| 902 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
| 903 return top(); | |
| 904 else | |
| 905 return ContiguousSpace::saved_mark_word(); | |
| 906 } | |
| 907 | |
| 908 void G1OffsetTableContigSpace::set_saved_mark() { | |
| 909 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 910 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
| 911 | |
| 912 if (_gc_time_stamp < curr_gc_time_stamp) { | |
| 913 // The order of these is important, as another thread might be | |
| 914 // about to start scanning this region. If it does so after | |
| 915 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
| 916 // will be false, and it will pick up top() as the high water mark | |
| 917 // of region. If it does so after _gc_time_stamp = ..., then it | |
| 918 // will pick up the right saved_mark_word() as the high water mark | |
| 919 // of the region. Either way, the behaviour will be correct. | |
| 920 ContiguousSpace::set_saved_mark(); | |
|
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921 OrderAccess::storestore(); |
|
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922 _gc_time_stamp = curr_gc_time_stamp; |
|
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923 // The following fence is to force a flush of the writes above, but |
|
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924 // is strictly not needed because when an allocating worker thread |
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925 // calls set_saved_mark() it does so under the ParGCRareEvent_lock; |
|
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926 // when the lock is released, the write will be flushed. |
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|
927 // OrderAccess::fence(); |
| 342 | 928 } |
| 929 } | |
| 930 | |
| 931 G1OffsetTableContigSpace:: | |
| 932 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
| 933 MemRegion mr, bool is_zeroed) : | |
| 934 _offsets(sharedOffsetArray, mr), | |
| 935 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
| 936 _gc_time_stamp(0) | |
| 937 { | |
| 938 _offsets.set_space(this); | |
| 356 | 939 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
| 342 | 940 } |
| 941 | |
| 942 size_t RegionList::length() { | |
| 943 size_t len = 0; | |
| 944 HeapRegion* cur = hd(); | |
| 945 DEBUG_ONLY(HeapRegion* last = NULL); | |
| 946 while (cur != NULL) { | |
| 947 len++; | |
| 948 DEBUG_ONLY(last = cur); | |
| 949 cur = get_next(cur); | |
| 950 } | |
| 951 assert(last == tl(), "Invariant"); | |
| 952 return len; | |
| 953 } | |
| 954 | |
| 955 void RegionList::insert_before_head(HeapRegion* r) { | |
| 956 assert(well_formed(), "Inv"); | |
| 957 set_next(r, hd()); | |
| 958 _hd = r; | |
| 959 _sz++; | |
| 960 if (tl() == NULL) _tl = r; | |
| 961 assert(well_formed(), "Inv"); | |
| 962 } | |
| 963 | |
| 964 void RegionList::prepend_list(RegionList* new_list) { | |
| 965 assert(well_formed(), "Precondition"); | |
| 966 assert(new_list->well_formed(), "Precondition"); | |
| 967 HeapRegion* new_tl = new_list->tl(); | |
| 968 if (new_tl != NULL) { | |
| 969 set_next(new_tl, hd()); | |
| 970 _hd = new_list->hd(); | |
| 971 _sz += new_list->sz(); | |
| 972 if (tl() == NULL) _tl = new_list->tl(); | |
| 973 } else { | |
| 974 assert(new_list->hd() == NULL && new_list->sz() == 0, "Inv"); | |
| 975 } | |
| 976 assert(well_formed(), "Inv"); | |
| 977 } | |
| 978 | |
| 979 void RegionList::delete_after(HeapRegion* r) { | |
| 980 assert(well_formed(), "Precondition"); | |
| 981 HeapRegion* next = get_next(r); | |
| 982 assert(r != NULL, "Precondition"); | |
| 983 HeapRegion* next_tl = get_next(next); | |
| 984 set_next(r, next_tl); | |
| 985 dec_sz(); | |
| 986 if (next == tl()) { | |
| 987 assert(next_tl == NULL, "Inv"); | |
| 988 _tl = r; | |
| 989 } | |
| 990 assert(well_formed(), "Inv"); | |
| 991 } | |
| 992 | |
| 993 HeapRegion* RegionList::pop() { | |
| 994 assert(well_formed(), "Inv"); | |
| 995 HeapRegion* res = hd(); | |
| 996 if (res != NULL) { | |
| 997 _hd = get_next(res); | |
| 998 _sz--; | |
| 999 set_next(res, NULL); | |
| 1000 if (sz() == 0) _tl = NULL; | |
| 1001 } | |
| 1002 assert(well_formed(), "Inv"); | |
| 1003 return res; | |
| 1004 } |