1 /* 2 * Copyright (c) 2017, 2021, Red Hat, Inc. 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 #include "precompiled.hpp" 26 #include "gc/shared/tlab_globals.hpp" 27 #include "gc/shenandoah/shenandoahAsserts.hpp" 28 #include "gc/shenandoah/shenandoahForwarding.inline.hpp" 29 #include "gc/shenandoah/shenandoahPhaseTimings.hpp" 30 #include "gc/shenandoah/shenandoahGeneration.hpp" 31 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 32 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp" 33 #include "gc/shenandoah/shenandoahOldGeneration.hpp" 34 #include "gc/shenandoah/shenandoahRootProcessor.hpp" 35 #include "gc/shenandoah/shenandoahTaskqueue.inline.hpp" 36 #include "gc/shenandoah/shenandoahUtils.hpp" 37 #include "gc/shenandoah/shenandoahVerifier.hpp" 38 #include "gc/shenandoah/shenandoahYoungGeneration.hpp" 39 #include "memory/allocation.hpp" 40 #include "memory/iterator.inline.hpp" 41 #include "memory/resourceArea.hpp" 42 #include "oops/compressedOops.inline.hpp" 43 #include "runtime/atomic.hpp" 44 #include "runtime/orderAccess.hpp" 45 #include "runtime/threads.hpp" 46 #include "utilities/align.hpp" 47 48 // Avoid name collision on verify_oop (defined in macroAssembler_arm.hpp) 49 #ifdef verify_oop 50 #undef verify_oop 51 #endif 52 53 static bool is_instance_ref_klass(Klass* k) { 54 return k->is_instance_klass() && InstanceKlass::cast(k)->reference_type() != REF_NONE; 55 } 56 57 class ShenandoahIgnoreReferenceDiscoverer : public ReferenceDiscoverer { 58 public: 59 virtual bool discover_reference(oop obj, ReferenceType type) { 60 return true; 61 } 62 }; 63 64 class ShenandoahVerifyOopClosure : public BasicOopIterateClosure { 65 private: 66 const char* _phase; 67 ShenandoahVerifier::VerifyOptions _options; 68 ShenandoahVerifierStack* _stack; 69 ShenandoahHeap* _heap; 70 MarkBitMap* _map; 71 ShenandoahLivenessData* _ld; 72 void* _interior_loc; 73 oop _loc; 74 ShenandoahGeneration* _generation; 75 76 public: 77 ShenandoahVerifyOopClosure(ShenandoahVerifierStack* stack, MarkBitMap* map, ShenandoahLivenessData* ld, 78 const char* phase, ShenandoahVerifier::VerifyOptions options) : 79 _phase(phase), 80 _options(options), 81 _stack(stack), 82 _heap(ShenandoahHeap::heap()), 83 _map(map), 84 _ld(ld), 85 _interior_loc(NULL), 86 _loc(NULL), 87 _generation(NULL) { 88 if (options._verify_marked == ShenandoahVerifier::_verify_marked_complete_except_references || 89 options._verify_marked == ShenandoahVerifier::_verify_marked_disable) { 90 set_ref_discoverer_internal(new ShenandoahIgnoreReferenceDiscoverer()); 91 } 92 93 if (_heap->mode()->is_generational()) { 94 _generation = _heap->active_generation(); 95 assert(_generation != NULL, "Expected active generation in this mode"); 96 } 97 } 98 99 private: 100 void check(ShenandoahAsserts::SafeLevel level, oop obj, bool test, const char* label) { 101 if (!test) { 102 ShenandoahAsserts::print_failure(level, obj, _interior_loc, _loc, _phase, label, __FILE__, __LINE__); 103 } 104 } 105 106 template <class T> 107 void do_oop_work(T* p) { 108 T o = RawAccess<>::oop_load(p); 109 if (!CompressedOops::is_null(o)) { 110 oop obj = CompressedOops::decode_not_null(o); 111 if (is_instance_ref_klass(obj->klass())) { 112 obj = ShenandoahForwarding::get_forwardee(obj); 113 } 114 // Single threaded verification can use faster non-atomic stack and bitmap 115 // methods. 116 // 117 // For performance reasons, only fully verify non-marked field values. 118 // We are here when the host object for *p is already marked. 119 120 if ( in_generation(obj) && _map->par_mark(obj)) { 121 verify_oop_at(p, obj); 122 _stack->push(ShenandoahVerifierTask(obj)); 123 } 124 } 125 } 126 127 bool in_generation(oop obj) { 128 if (_generation == NULL) { 129 return true; 130 } 131 132 ShenandoahHeapRegion* region = _heap->heap_region_containing(obj); 133 return _generation->contains(region); 134 } 135 136 void verify_oop(oop obj) { 137 // Perform consistency checks with gradually decreasing safety level. This guarantees 138 // that failure report would not try to touch something that was not yet verified to be 139 // safe to process. 140 141 check(ShenandoahAsserts::_safe_unknown, obj, _heap->is_in(obj), 142 "oop must be in heap"); 143 check(ShenandoahAsserts::_safe_unknown, obj, is_object_aligned(obj), 144 "oop must be aligned"); 145 146 ShenandoahHeapRegion* obj_reg = _heap->heap_region_containing(obj); 147 Klass* obj_klass = obj->klass_or_null(); 148 149 // Verify that obj is not in dead space: 150 { 151 // Do this before touching obj->size() 152 check(ShenandoahAsserts::_safe_unknown, obj, obj_klass != NULL, 153 "Object klass pointer should not be NULL"); 154 check(ShenandoahAsserts::_safe_unknown, obj, Metaspace::contains(obj_klass), 155 "Object klass pointer must go to metaspace"); 156 157 HeapWord* obj_addr = cast_from_oop<HeapWord*>(obj); 158 check(ShenandoahAsserts::_safe_unknown, obj, obj_addr < obj_reg->top(), 159 "Object start should be within the region"); 160 161 if (!obj_reg->is_humongous()) { 162 check(ShenandoahAsserts::_safe_unknown, obj, (obj_addr + obj->size()) <= obj_reg->top(), 163 "Object end should be within the region"); 164 } else { 165 size_t humongous_start = obj_reg->index(); 166 size_t humongous_end = humongous_start + (obj->size() >> ShenandoahHeapRegion::region_size_words_shift()); 167 for (size_t idx = humongous_start + 1; idx < humongous_end; idx++) { 168 check(ShenandoahAsserts::_safe_unknown, obj, _heap->get_region(idx)->is_humongous_continuation(), 169 "Humongous object is in continuation that fits it"); 170 } 171 } 172 173 // ------------ obj is safe at this point -------------- 174 175 check(ShenandoahAsserts::_safe_oop, obj, obj_reg->is_active(), 176 "Object should be in active region"); 177 178 switch (_options._verify_liveness) { 179 case ShenandoahVerifier::_verify_liveness_disable: 180 // skip 181 break; 182 case ShenandoahVerifier::_verify_liveness_complete: 183 Atomic::add(&_ld[obj_reg->index()], (uint) obj->size(), memory_order_relaxed); 184 // fallthrough for fast failure for un-live regions: 185 case ShenandoahVerifier::_verify_liveness_conservative: 186 check(ShenandoahAsserts::_safe_oop, obj, obj_reg->has_live() || 187 (obj_reg->is_old() && ShenandoahHeap::heap()->is_gc_generation_young()), 188 "Object must belong to region with live data"); 189 break; 190 default: 191 assert(false, "Unhandled liveness verification"); 192 } 193 } 194 195 oop fwd = ShenandoahForwarding::get_forwardee_raw_unchecked(obj); 196 197 ShenandoahHeapRegion* fwd_reg = NULL; 198 199 if (obj != fwd) { 200 check(ShenandoahAsserts::_safe_oop, obj, _heap->is_in(fwd), 201 "Forwardee must be in heap"); 202 check(ShenandoahAsserts::_safe_oop, obj, !CompressedOops::is_null(fwd), 203 "Forwardee is set"); 204 check(ShenandoahAsserts::_safe_oop, obj, is_object_aligned(fwd), 205 "Forwardee must be aligned"); 206 207 // Do this before touching fwd->size() 208 Klass* fwd_klass = fwd->klass_or_null(); 209 check(ShenandoahAsserts::_safe_oop, obj, fwd_klass != NULL, 210 "Forwardee klass pointer should not be NULL"); 211 check(ShenandoahAsserts::_safe_oop, obj, Metaspace::contains(fwd_klass), 212 "Forwardee klass pointer must go to metaspace"); 213 check(ShenandoahAsserts::_safe_oop, obj, obj_klass == fwd_klass, 214 "Forwardee klass pointer must go to metaspace"); 215 216 fwd_reg = _heap->heap_region_containing(fwd); 217 218 // Verify that forwardee is not in the dead space: 219 check(ShenandoahAsserts::_safe_oop, obj, !fwd_reg->is_humongous(), 220 "Should have no humongous forwardees"); 221 222 HeapWord* fwd_addr = cast_from_oop<HeapWord* >(fwd); 223 check(ShenandoahAsserts::_safe_oop, obj, fwd_addr < fwd_reg->top(), 224 "Forwardee start should be within the region"); 225 check(ShenandoahAsserts::_safe_oop, obj, (fwd_addr + fwd->size()) <= fwd_reg->top(), 226 "Forwardee end should be within the region"); 227 228 oop fwd2 = ShenandoahForwarding::get_forwardee_raw_unchecked(fwd); 229 check(ShenandoahAsserts::_safe_oop, obj, (fwd == fwd2), 230 "Double forwarding"); 231 } else { 232 fwd_reg = obj_reg; 233 } 234 235 // ------------ obj and fwd are safe at this point -------------- 236 // We allow for marked or old here for two reasons: 237 // 1. If this is a young collect, old objects wouldn't be marked. We've 238 // recently change the verifier traversal to only follow young objects 239 // during a young collect so this _shouldn't_ be necessary. 240 // 2. At present, we do not clear dead objects from the remembered set. 241 // Everything in the remembered set is old (ipso facto), so allowing for 242 // 'marked_or_old' covers the case of stale objects in rset. 243 // TODO: Just use 'is_marked' here. 244 switch (_options._verify_marked) { 245 case ShenandoahVerifier::_verify_marked_disable: 246 // skip 247 break; 248 case ShenandoahVerifier::_verify_marked_incomplete: 249 check(ShenandoahAsserts::_safe_all, obj, _heap->marking_context()->is_marked_or_old(obj), 250 "Must be marked in incomplete bitmap"); 251 break; 252 case ShenandoahVerifier::_verify_marked_complete: 253 check(ShenandoahAsserts::_safe_all, obj, _heap->complete_marking_context()->is_marked_or_old(obj), 254 "Must be marked in complete bitmap"); 255 break; 256 case ShenandoahVerifier::_verify_marked_complete_except_references: 257 check(ShenandoahAsserts::_safe_all, obj, _heap->complete_marking_context()->is_marked_or_old(obj), 258 "Must be marked in complete bitmap, except j.l.r.Reference referents"); 259 break; 260 default: 261 assert(false, "Unhandled mark verification"); 262 } 263 264 switch (_options._verify_forwarded) { 265 case ShenandoahVerifier::_verify_forwarded_disable: 266 // skip 267 break; 268 case ShenandoahVerifier::_verify_forwarded_none: { 269 check(ShenandoahAsserts::_safe_all, obj, (obj == fwd), 270 "Should not be forwarded"); 271 break; 272 } 273 case ShenandoahVerifier::_verify_forwarded_allow: { 274 if (obj != fwd) { 275 check(ShenandoahAsserts::_safe_all, obj, obj_reg != fwd_reg, 276 "Forwardee should be in another region"); 277 } 278 break; 279 } 280 default: 281 assert(false, "Unhandled forwarding verification"); 282 } 283 284 switch (_options._verify_cset) { 285 case ShenandoahVerifier::_verify_cset_disable: 286 // skip 287 break; 288 case ShenandoahVerifier::_verify_cset_none: 289 check(ShenandoahAsserts::_safe_all, obj, !_heap->in_collection_set(obj), 290 "Should not have references to collection set"); 291 break; 292 case ShenandoahVerifier::_verify_cset_forwarded: 293 if (_heap->in_collection_set(obj)) { 294 check(ShenandoahAsserts::_safe_all, obj, (obj != fwd), 295 "Object in collection set, should have forwardee"); 296 } 297 break; 298 default: 299 assert(false, "Unhandled cset verification"); 300 } 301 302 } 303 304 public: 305 /** 306 * Verify object with known interior reference. 307 * @param p interior reference where the object is referenced from; can be off-heap 308 * @param obj verified object 309 */ 310 template <class T> 311 void verify_oop_at(T* p, oop obj) { 312 _interior_loc = p; 313 verify_oop(obj); 314 _interior_loc = NULL; 315 } 316 317 /** 318 * Verify object without known interior reference. 319 * Useful when picking up the object at known offset in heap, 320 * but without knowing what objects reference it. 321 * @param obj verified object 322 */ 323 void verify_oop_standalone(oop obj) { 324 _interior_loc = NULL; 325 verify_oop(obj); 326 _interior_loc = NULL; 327 } 328 329 /** 330 * Verify oop fields from this object. 331 * @param obj host object for verified fields 332 */ 333 void verify_oops_from(oop obj) { 334 _loc = obj; 335 obj->oop_iterate(this); 336 _loc = NULL; 337 } 338 339 virtual void do_oop(oop* p) { do_oop_work(p); } 340 virtual void do_oop(narrowOop* p) { do_oop_work(p); } 341 }; 342 343 // This closure computes the amounts of used, committed, and garbage memory and the number of regions contained within 344 // a subset (e.g. the young generation or old generation) of the total heap. 345 class ShenandoahCalculateRegionStatsClosure : public ShenandoahHeapRegionClosure { 346 private: 347 size_t _used, _committed, _garbage, _regions; 348 public: 349 ShenandoahCalculateRegionStatsClosure() : _used(0), _committed(0), _garbage(0), _regions(0) {}; 350 351 void heap_region_do(ShenandoahHeapRegion* r) { 352 _used += r->used(); 353 log_debug(gc)("ShenandoahCalculateRegionStatsClosure added " SIZE_FORMAT " for %s Region " SIZE_FORMAT ", yielding: " SIZE_FORMAT, 354 r->used(), r->is_humongous()? "humongous": "regular", r->index(), _used); 355 _garbage += r->garbage(); 356 _committed += r->is_committed() ? ShenandoahHeapRegion::region_size_bytes() : 0; 357 _regions++; 358 } 359 360 size_t used() { return _used; } 361 size_t committed() { return _committed; } 362 size_t garbage() { return _garbage; } 363 size_t regions() { return _regions; } 364 365 // span is the total memory affiliated with these stats (some of which is in use and other is available) 366 size_t span() { return _regions * ShenandoahHeapRegion::region_size_bytes(); } 367 }; 368 369 class ShenandoahGenerationStatsClosure : public ShenandoahHeapRegionClosure { 370 public: 371 ShenandoahCalculateRegionStatsClosure old; 372 ShenandoahCalculateRegionStatsClosure young; 373 ShenandoahCalculateRegionStatsClosure global; 374 375 void heap_region_do(ShenandoahHeapRegion* r) override { 376 switch (r->affiliation()) { 377 default: 378 ShouldNotReachHere(); 379 return; 380 case FREE: return; 381 case YOUNG_GENERATION: 382 young.heap_region_do(r); 383 break; 384 case OLD_GENERATION: 385 old.heap_region_do(r); 386 break; 387 } 388 global.heap_region_do(r); 389 } 390 391 static void log_usage(ShenandoahGeneration* generation, ShenandoahCalculateRegionStatsClosure& stats) { 392 log_debug(gc)("Safepoint verification: %s verified usage: " SIZE_FORMAT "%s, recorded usage: " SIZE_FORMAT "%s", 393 generation->name(), 394 byte_size_in_proper_unit(generation->used()), proper_unit_for_byte_size(generation->used()), 395 byte_size_in_proper_unit(stats.used()), proper_unit_for_byte_size(stats.used())); 396 } 397 398 static void validate_usage(const char* label, ShenandoahGeneration* generation, ShenandoahCalculateRegionStatsClosure& stats) { 399 size_t generation_used = generation->used(); 400 guarantee(stats.used() == generation_used, 401 "%s: generation (%s) used size must be consistent: generation-used = " SIZE_FORMAT "%s, regions-used = " SIZE_FORMAT "%s", 402 label, generation->name(), 403 byte_size_in_proper_unit(generation_used), proper_unit_for_byte_size(generation_used), 404 byte_size_in_proper_unit(stats.used()), proper_unit_for_byte_size(stats.used())); 405 406 guarantee(stats.regions() == generation->used_regions(), 407 "%s: generation (%s) used regions (" SIZE_FORMAT ") must equal regions that are in use (" SIZE_FORMAT ")", 408 label, generation->name(), generation->used_regions(), stats.regions()); 409 410 size_t capacity = generation->adjusted_capacity(); 411 guarantee(stats.span() <= capacity, 412 "%s: generation (%s) size spanned by regions (" SIZE_FORMAT ") must not exceed current capacity (" SIZE_FORMAT "%s)", 413 label, generation->name(), stats.regions(), 414 byte_size_in_proper_unit(capacity), proper_unit_for_byte_size(capacity)); 415 416 } 417 }; 418 419 class ShenandoahVerifyHeapRegionClosure : public ShenandoahHeapRegionClosure { 420 private: 421 ShenandoahHeap* _heap; 422 const char* _phase; 423 ShenandoahVerifier::VerifyRegions _regions; 424 public: 425 ShenandoahVerifyHeapRegionClosure(const char* phase, ShenandoahVerifier::VerifyRegions regions) : 426 _heap(ShenandoahHeap::heap()), 427 _phase(phase), 428 _regions(regions) {}; 429 430 void print_failure(ShenandoahHeapRegion* r, const char* label) { 431 ResourceMark rm; 432 433 ShenandoahMessageBuffer msg("Shenandoah verification failed; %s: %s\n\n", _phase, label); 434 435 stringStream ss; 436 r->print_on(&ss); 437 msg.append("%s", ss.as_string()); 438 439 report_vm_error(__FILE__, __LINE__, msg.buffer()); 440 } 441 442 void verify(ShenandoahHeapRegion* r, bool test, const char* msg) { 443 if (!test) { 444 print_failure(r, msg); 445 } 446 } 447 448 void heap_region_do(ShenandoahHeapRegion* r) { 449 switch (_regions) { 450 case ShenandoahVerifier::_verify_regions_disable: 451 break; 452 case ShenandoahVerifier::_verify_regions_notrash: 453 verify(r, !r->is_trash(), 454 "Should not have trash regions"); 455 break; 456 case ShenandoahVerifier::_verify_regions_nocset: 457 verify(r, !r->is_cset(), 458 "Should not have cset regions"); 459 break; 460 case ShenandoahVerifier::_verify_regions_notrash_nocset: 461 verify(r, !r->is_trash(), 462 "Should not have trash regions"); 463 verify(r, !r->is_cset(), 464 "Should not have cset regions"); 465 break; 466 default: 467 ShouldNotReachHere(); 468 } 469 470 verify(r, r->capacity() == ShenandoahHeapRegion::region_size_bytes(), 471 "Capacity should match region size"); 472 473 verify(r, r->bottom() <= r->top(), 474 "Region top should not be less than bottom"); 475 476 verify(r, r->bottom() <= _heap->marking_context()->top_at_mark_start(r), 477 "Region TAMS should not be less than bottom"); 478 479 verify(r, _heap->marking_context()->top_at_mark_start(r) <= r->top(), 480 "Complete TAMS should not be larger than top"); 481 482 verify(r, r->get_live_data_bytes() <= r->capacity(), 483 "Live data cannot be larger than capacity"); 484 485 verify(r, r->garbage() <= r->capacity(), 486 "Garbage cannot be larger than capacity"); 487 488 verify(r, r->used() <= r->capacity(), 489 "Used cannot be larger than capacity"); 490 491 verify(r, r->get_shared_allocs() <= r->capacity(), 492 "Shared alloc count should not be larger than capacity"); 493 494 verify(r, r->get_tlab_allocs() <= r->capacity(), 495 "TLAB alloc count should not be larger than capacity"); 496 497 verify(r, r->get_gclab_allocs() <= r->capacity(), 498 "GCLAB alloc count should not be larger than capacity"); 499 500 verify(r, r->get_plab_allocs() <= r->capacity(), 501 "PLAB alloc count should not be larger than capacity"); 502 503 verify(r, r->get_shared_allocs() + r->get_tlab_allocs() + r->get_gclab_allocs() + r->get_plab_allocs() == r->used(), 504 "Accurate accounting: shared + TLAB + GCLAB + PLAB = used"); 505 506 verify(r, !r->is_empty() || !r->has_live(), 507 "Empty regions should not have live data"); 508 509 verify(r, r->is_cset() == _heap->collection_set()->is_in(r), 510 "Transitional: region flags and collection set agree"); 511 } 512 }; 513 514 class ShenandoahVerifierReachableTask : public WorkerTask { 515 private: 516 const char* _label; 517 ShenandoahVerifier::VerifyOptions _options; 518 ShenandoahHeap* _heap; 519 ShenandoahLivenessData* _ld; 520 MarkBitMap* _bitmap; 521 volatile size_t _processed; 522 523 public: 524 ShenandoahVerifierReachableTask(MarkBitMap* bitmap, 525 ShenandoahLivenessData* ld, 526 const char* label, 527 ShenandoahVerifier::VerifyOptions options) : 528 WorkerTask("Shenandoah Verifier Reachable Objects"), 529 _label(label), 530 _options(options), 531 _heap(ShenandoahHeap::heap()), 532 _ld(ld), 533 _bitmap(bitmap), 534 _processed(0) {}; 535 536 size_t processed() { 537 return _processed; 538 } 539 540 virtual void work(uint worker_id) { 541 ResourceMark rm; 542 ShenandoahVerifierStack stack; 543 544 // On level 2, we need to only check the roots once. 545 // On level 3, we want to check the roots, and seed the local stack. 546 // It is a lesser evil to accept multiple root scans at level 3, because 547 // extended parallelism would buy us out. 548 if (((ShenandoahVerifyLevel == 2) && (worker_id == 0)) 549 || (ShenandoahVerifyLevel >= 3)) { 550 ShenandoahVerifyOopClosure cl(&stack, _bitmap, _ld, 551 ShenandoahMessageBuffer("%s, Roots", _label), 552 _options); 553 if (_heap->unload_classes()) { 554 ShenandoahRootVerifier::strong_roots_do(&cl); 555 } else { 556 ShenandoahRootVerifier::roots_do(&cl); 557 } 558 } 559 560 size_t processed = 0; 561 562 if (ShenandoahVerifyLevel >= 3) { 563 ShenandoahVerifyOopClosure cl(&stack, _bitmap, _ld, 564 ShenandoahMessageBuffer("%s, Reachable", _label), 565 _options); 566 while (!stack.is_empty()) { 567 processed++; 568 ShenandoahVerifierTask task = stack.pop(); 569 cl.verify_oops_from(task.obj()); 570 } 571 } 572 573 Atomic::add(&_processed, processed, memory_order_relaxed); 574 } 575 }; 576 577 class ShenandoahVerifierMarkedRegionTask : public WorkerTask { 578 private: 579 const char* _label; 580 ShenandoahVerifier::VerifyOptions _options; 581 ShenandoahHeap* _heap; 582 MarkBitMap* _bitmap; 583 ShenandoahLivenessData* _ld; 584 volatile size_t _claimed; 585 volatile size_t _processed; 586 ShenandoahGeneration* _generation; 587 588 public: 589 ShenandoahVerifierMarkedRegionTask(MarkBitMap* bitmap, 590 ShenandoahLivenessData* ld, 591 const char* label, 592 ShenandoahVerifier::VerifyOptions options) : 593 WorkerTask("Shenandoah Verifier Marked Objects"), 594 _label(label), 595 _options(options), 596 _heap(ShenandoahHeap::heap()), 597 _bitmap(bitmap), 598 _ld(ld), 599 _claimed(0), 600 _processed(0), 601 _generation(NULL) { 602 if (_heap->mode()->is_generational()) { 603 _generation = _heap->active_generation(); 604 assert(_generation != NULL, "Expected active generation in this mode."); 605 } 606 }; 607 608 size_t processed() { 609 return Atomic::load(&_processed); 610 } 611 612 virtual void work(uint worker_id) { 613 ShenandoahVerifierStack stack; 614 ShenandoahVerifyOopClosure cl(&stack, _bitmap, _ld, 615 ShenandoahMessageBuffer("%s, Marked", _label), 616 _options); 617 618 while (true) { 619 size_t v = Atomic::fetch_and_add(&_claimed, 1u, memory_order_relaxed); 620 if (v < _heap->num_regions()) { 621 ShenandoahHeapRegion* r = _heap->get_region(v); 622 if (!in_generation(r)) { 623 continue; 624 } 625 626 if (!r->is_humongous() && !r->is_trash()) { 627 work_regular(r, stack, cl); 628 } else if (r->is_humongous_start()) { 629 work_humongous(r, stack, cl); 630 } 631 } else { 632 break; 633 } 634 } 635 } 636 637 bool in_generation(ShenandoahHeapRegion* r) { 638 return _generation == NULL || _generation->contains(r); 639 } 640 641 virtual void work_humongous(ShenandoahHeapRegion* r, ShenandoahVerifierStack& stack, ShenandoahVerifyOopClosure& cl) { 642 size_t processed = 0; 643 HeapWord* obj = r->bottom(); 644 if (_heap->complete_marking_context()->is_marked(cast_to_oop(obj))) { 645 verify_and_follow(obj, stack, cl, &processed); 646 } 647 Atomic::add(&_processed, processed, memory_order_relaxed); 648 } 649 650 virtual void work_regular(ShenandoahHeapRegion* r, ShenandoahVerifierStack &stack, ShenandoahVerifyOopClosure &cl) { 651 size_t processed = 0; 652 ShenandoahMarkingContext* ctx = _heap->complete_marking_context(); 653 HeapWord* tams = ctx->top_at_mark_start(r); 654 655 // Bitmaps, before TAMS 656 if (tams > r->bottom()) { 657 HeapWord* start = r->bottom(); 658 HeapWord* addr = ctx->get_next_marked_addr(start, tams); 659 660 while (addr < tams) { 661 verify_and_follow(addr, stack, cl, &processed); 662 addr += 1; 663 if (addr < tams) { 664 addr = ctx->get_next_marked_addr(addr, tams); 665 } 666 } 667 } 668 669 // Size-based, after TAMS 670 { 671 HeapWord* limit = r->top(); 672 HeapWord* addr = tams; 673 674 while (addr < limit) { 675 verify_and_follow(addr, stack, cl, &processed); 676 addr += cast_to_oop(addr)->size(); 677 } 678 } 679 680 Atomic::add(&_processed, processed, memory_order_relaxed); 681 } 682 683 void verify_and_follow(HeapWord* addr, ShenandoahVerifierStack &stack, ShenandoahVerifyOopClosure &cl, size_t* processed) { 684 if (!_bitmap->par_mark(addr)) return; 685 686 // Verify the object itself: 687 oop obj = cast_to_oop(addr); 688 cl.verify_oop_standalone(obj); 689 690 // Verify everything reachable from that object too, hopefully realizing 691 // everything was already marked, and never touching further: 692 if (!is_instance_ref_klass(obj->klass())) { 693 cl.verify_oops_from(obj); 694 (*processed)++; 695 } 696 while (!stack.is_empty()) { 697 ShenandoahVerifierTask task = stack.pop(); 698 cl.verify_oops_from(task.obj()); 699 (*processed)++; 700 } 701 } 702 }; 703 704 class VerifyThreadGCState : public ThreadClosure { 705 private: 706 const char* const _label; 707 char const _expected; 708 709 public: 710 VerifyThreadGCState(const char* label, char expected) : _label(label), _expected(expected) {} 711 void do_thread(Thread* t) { 712 char actual = ShenandoahThreadLocalData::gc_state(t); 713 if (actual != _expected && !(actual & ShenandoahHeap::OLD_MARKING)) { 714 fatal("%s: Thread %s: expected gc-state %d, actual %d", _label, t->name(), _expected, actual); 715 } 716 } 717 }; 718 719 void ShenandoahVerifier::verify_at_safepoint(const char* label, 720 VerifyRememberedSet remembered, 721 VerifyForwarded forwarded, VerifyMarked marked, 722 VerifyCollectionSet cset, 723 VerifyLiveness liveness, VerifyRegions regions, 724 VerifyGCState gcstate) { 725 guarantee(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "only when nothing else happens"); 726 guarantee(ShenandoahVerify, "only when enabled, and bitmap is initialized in ShenandoahHeap::initialize"); 727 728 // Avoid side-effect of changing workers' active thread count, but bypass concurrent/parallel protocol check 729 ShenandoahPushWorkerScope verify_worker_scope(_heap->workers(), _heap->max_workers(), false /*bypass check*/); 730 731 log_info(gc,start)("Verify %s, Level " INTX_FORMAT, label, ShenandoahVerifyLevel); 732 733 // GC state checks 734 { 735 char expected = -1; 736 bool enabled; 737 switch (gcstate) { 738 case _verify_gcstate_disable: 739 enabled = false; 740 break; 741 case _verify_gcstate_forwarded: 742 enabled = true; 743 expected = ShenandoahHeap::HAS_FORWARDED; 744 break; 745 case _verify_gcstate_evacuation: 746 enabled = true; 747 expected = ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::EVACUATION; 748 if (!_heap->is_stw_gc_in_progress()) { 749 // Only concurrent GC sets this. 750 expected |= ShenandoahHeap::WEAK_ROOTS; 751 } 752 break; 753 case _verify_gcstate_updating: 754 enabled = true; 755 expected = ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::UPDATEREFS; 756 break; 757 case _verify_gcstate_stable: 758 enabled = true; 759 expected = ShenandoahHeap::STABLE; 760 break; 761 case _verify_gcstate_stable_weakroots: 762 enabled = true; 763 expected = ShenandoahHeap::STABLE; 764 if (!_heap->is_stw_gc_in_progress()) { 765 // Only concurrent GC sets this. 766 expected |= ShenandoahHeap::WEAK_ROOTS; 767 } 768 break; 769 default: 770 enabled = false; 771 assert(false, "Unhandled gc-state verification"); 772 } 773 774 if (enabled) { 775 char actual = _heap->gc_state(); 776 // Old generation marking is allowed in all states. 777 if (actual != expected && !(actual & ShenandoahHeap::OLD_MARKING)) { 778 fatal("%s: Global gc-state: expected %d, actual %d", label, expected, actual); 779 } 780 781 VerifyThreadGCState vtgcs(label, expected); 782 Threads::java_threads_do(&vtgcs); 783 } 784 } 785 786 // Deactivate barriers temporarily: Verifier wants plain heap accesses 787 ShenandoahGCStateResetter resetter; 788 789 // Heap size checks 790 { 791 ShenandoahHeapLocker lock(_heap->lock()); 792 793 ShenandoahCalculateRegionStatsClosure cl; 794 _heap->heap_region_iterate(&cl); 795 size_t heap_used = _heap->used(); 796 guarantee(cl.used() == heap_used, 797 "%s: heap used size must be consistent: heap-used = " SIZE_FORMAT "%s, regions-used = " SIZE_FORMAT "%s", 798 label, 799 byte_size_in_proper_unit(heap_used), proper_unit_for_byte_size(heap_used), 800 byte_size_in_proper_unit(cl.used()), proper_unit_for_byte_size(cl.used())); 801 802 size_t heap_committed = _heap->committed(); 803 guarantee(cl.committed() == heap_committed, 804 "%s: heap committed size must be consistent: heap-committed = " SIZE_FORMAT "%s, regions-committed = " SIZE_FORMAT "%s", 805 label, 806 byte_size_in_proper_unit(heap_committed), proper_unit_for_byte_size(heap_committed), 807 byte_size_in_proper_unit(cl.committed()), proper_unit_for_byte_size(cl.committed())); 808 } 809 810 log_debug(gc)("Safepoint verification finished heap usage verification"); 811 812 ShenandoahGeneration* generation; 813 if (_heap->mode()->is_generational()) { 814 generation = _heap->active_generation(); 815 guarantee(generation != NULL, "Need to know which generation to verify."); 816 } else { 817 generation = NULL; 818 } 819 820 if (generation != NULL) { 821 ShenandoahHeapLocker lock(_heap->lock()); 822 823 if (remembered == _verify_remembered_for_marking) { 824 log_debug(gc)("Safepoint verification of remembered set at mark"); 825 } else if (remembered == _verify_remembered_for_updating_references) { 826 log_debug(gc)("Safepoint verification of remembered set at update ref"); 827 } else if (remembered == _verify_remembered_after_full_gc) { 828 log_debug(gc)("Safepoint verification of remembered set after full gc"); 829 } 830 831 if (remembered == _verify_remembered_for_marking) { 832 _heap->verify_rem_set_at_mark(); 833 } else if (remembered == _verify_remembered_for_updating_references) { 834 _heap->verify_rem_set_at_update_ref(); 835 } else if (remembered == _verify_remembered_after_full_gc) { 836 _heap->verify_rem_set_after_full_gc(); 837 } 838 839 ShenandoahGenerationStatsClosure cl; 840 _heap->heap_region_iterate(&cl); 841 842 if (LogTarget(Debug, gc)::is_enabled()) { 843 ShenandoahGenerationStatsClosure::log_usage(_heap->old_generation(), cl.old); 844 ShenandoahGenerationStatsClosure::log_usage(_heap->young_generation(), cl.young); 845 ShenandoahGenerationStatsClosure::log_usage(_heap->global_generation(), cl.global); 846 } 847 848 ShenandoahGenerationStatsClosure::validate_usage(label, _heap->old_generation(), cl.old); 849 ShenandoahGenerationStatsClosure::validate_usage(label, _heap->young_generation(), cl.young); 850 ShenandoahGenerationStatsClosure::validate_usage(label, _heap->global_generation(), cl.global); 851 } 852 853 log_debug(gc)("Safepoint verification finished remembered set verification"); 854 855 // Internal heap region checks 856 if (ShenandoahVerifyLevel >= 1) { 857 ShenandoahVerifyHeapRegionClosure cl(label, regions); 858 if (generation != NULL) { 859 generation->heap_region_iterate(&cl); 860 } else { 861 _heap->heap_region_iterate(&cl); 862 } 863 } 864 865 log_debug(gc)("Safepoint verification finished heap region closure verification"); 866 867 OrderAccess::fence(); 868 869 if (UseTLAB) { 870 _heap->labs_make_parsable(); 871 } 872 873 // Allocate temporary bitmap for storing marking wavefront: 874 _verification_bit_map->clear(); 875 876 // Allocate temporary array for storing liveness data 877 ShenandoahLivenessData* ld = NEW_C_HEAP_ARRAY(ShenandoahLivenessData, _heap->num_regions(), mtGC); 878 Copy::fill_to_bytes((void*)ld, _heap->num_regions()*sizeof(ShenandoahLivenessData), 0); 879 880 const VerifyOptions& options = ShenandoahVerifier::VerifyOptions(forwarded, marked, cset, liveness, regions, gcstate); 881 882 // Steps 1-2. Scan root set to get initial reachable set. Finish walking the reachable heap. 883 // This verifies what application can see, since it only cares about reachable objects. 884 size_t count_reachable = 0; 885 if (ShenandoahVerifyLevel >= 2) { 886 ShenandoahVerifierReachableTask task(_verification_bit_map, ld, label, options); 887 _heap->workers()->run_task(&task); 888 count_reachable = task.processed(); 889 } 890 891 log_debug(gc)("Safepoint verification finished getting initial reachable set"); 892 893 // Step 3. Walk marked objects. Marked objects might be unreachable. This verifies what collector, 894 // not the application, can see during the region scans. There is no reason to process the objects 895 // that were already verified, e.g. those marked in verification bitmap. There is interaction with TAMS: 896 // before TAMS, we verify the bitmaps, if available; after TAMS, we walk until the top(). It mimics 897 // what marked_object_iterate is doing, without calling into that optimized (and possibly incorrect) 898 // version 899 900 size_t count_marked = 0; 901 if (ShenandoahVerifyLevel >= 4 && (marked == _verify_marked_complete || marked == _verify_marked_complete_except_references)) { 902 guarantee(_heap->marking_context()->is_complete(), "Marking context should be complete"); 903 ShenandoahVerifierMarkedRegionTask task(_verification_bit_map, ld, label, options); 904 _heap->workers()->run_task(&task); 905 count_marked = task.processed(); 906 } else { 907 guarantee(ShenandoahVerifyLevel < 4 || marked == _verify_marked_incomplete || marked == _verify_marked_disable, "Should be"); 908 } 909 910 log_debug(gc)("Safepoint verification finished walking marked objects"); 911 912 // Step 4. Verify accumulated liveness data, if needed. Only reliable if verification level includes 913 // marked objects. 914 915 if (ShenandoahVerifyLevel >= 4 && marked == _verify_marked_complete && liveness == _verify_liveness_complete) { 916 for (size_t i = 0; i < _heap->num_regions(); i++) { 917 ShenandoahHeapRegion* r = _heap->get_region(i); 918 if (generation != NULL && !generation->contains(r)) { 919 continue; 920 } 921 922 juint verf_live = 0; 923 if (r->is_humongous()) { 924 // For humongous objects, test if start region is marked live, and if so, 925 // all humongous regions in that chain have live data equal to their "used". 926 juint start_live = Atomic::load(&ld[r->humongous_start_region()->index()]); 927 if (start_live > 0) { 928 verf_live = (juint)(r->used() / HeapWordSize); 929 } 930 } else { 931 verf_live = Atomic::load(&ld[r->index()]); 932 } 933 934 size_t reg_live = r->get_live_data_words(); 935 if (reg_live != verf_live) { 936 stringStream ss; 937 r->print_on(&ss); 938 fatal("%s: Live data should match: region-live = " SIZE_FORMAT ", verifier-live = " UINT32_FORMAT "\n%s", 939 label, reg_live, verf_live, ss.freeze()); 940 } 941 } 942 } 943 944 log_debug(gc)("Safepoint verification finished accumulation of liveness data"); 945 946 947 log_info(gc)("Verify %s, Level " INTX_FORMAT " (" SIZE_FORMAT " reachable, " SIZE_FORMAT " marked)", 948 label, ShenandoahVerifyLevel, count_reachable, count_marked); 949 950 FREE_C_HEAP_ARRAY(ShenandoahLivenessData, ld); 951 } 952 953 void ShenandoahVerifier::verify_generic(VerifyOption vo) { 954 verify_at_safepoint( 955 "Generic Verification", 956 _verify_remembered_disable, // do not verify remembered set 957 _verify_forwarded_allow, // conservatively allow forwarded 958 _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations 959 _verify_cset_disable, // cset may be inconsistent 960 _verify_liveness_disable, // no reliable liveness data 961 _verify_regions_disable, // no reliable region data 962 _verify_gcstate_disable // no data about gcstate 963 ); 964 } 965 966 void ShenandoahVerifier::verify_before_concmark() { 967 verify_at_safepoint( 968 "Before Mark", 969 _verify_remembered_for_marking, // verify read-only remembered set from bottom() to top() 970 _verify_forwarded_none, // UR should have fixed up 971 _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations 972 _verify_cset_none, // UR should have fixed this 973 _verify_liveness_disable, // no reliable liveness data 974 _verify_regions_notrash, // no trash regions 975 _verify_gcstate_stable // there are no forwarded objects 976 ); 977 } 978 979 void ShenandoahVerifier::verify_after_concmark() { 980 verify_at_safepoint( 981 "After Mark", 982 _verify_remembered_disable, // do not verify remembered set 983 _verify_forwarded_none, // no forwarded references 984 _verify_marked_complete_except_references, // bitmaps as precise as we can get, except dangling j.l.r.Refs 985 _verify_cset_none, // no references to cset anymore 986 _verify_liveness_complete, // liveness data must be complete here 987 _verify_regions_disable, // trash regions not yet recycled 988 _verify_gcstate_stable_weakroots // heap is still stable, weakroots are in progress 989 ); 990 } 991 992 void ShenandoahVerifier::verify_before_evacuation() { 993 verify_at_safepoint( 994 "Before Evacuation", 995 _verify_remembered_disable, // do not verify remembered set 996 _verify_forwarded_none, // no forwarded references 997 _verify_marked_complete_except_references, // walk over marked objects too 998 _verify_cset_disable, // non-forwarded references to cset expected 999 _verify_liveness_complete, // liveness data must be complete here 1000 _verify_regions_disable, // trash regions not yet recycled 1001 _verify_gcstate_stable_weakroots // heap is still stable, weakroots are in progress 1002 ); 1003 } 1004 1005 void ShenandoahVerifier::verify_during_evacuation() { 1006 verify_at_safepoint( 1007 "During Evacuation", 1008 _verify_remembered_disable, // do not verify remembered set 1009 _verify_forwarded_allow, // some forwarded references are allowed 1010 _verify_marked_disable, // walk only roots 1011 _verify_cset_disable, // some cset references are not forwarded yet 1012 _verify_liveness_disable, // liveness data might be already stale after pre-evacs 1013 _verify_regions_disable, // trash regions not yet recycled 1014 _verify_gcstate_evacuation // evacuation is in progress 1015 ); 1016 } 1017 1018 void ShenandoahVerifier::verify_after_evacuation() { 1019 verify_at_safepoint( 1020 "After Evacuation", 1021 _verify_remembered_disable, // do not verify remembered set 1022 _verify_forwarded_allow, // objects are still forwarded 1023 _verify_marked_complete, // bitmaps might be stale, but alloc-after-mark should be well 1024 _verify_cset_forwarded, // all cset refs are fully forwarded 1025 _verify_liveness_disable, // no reliable liveness data anymore 1026 _verify_regions_notrash, // trash regions have been recycled already 1027 _verify_gcstate_forwarded // evacuation produced some forwarded objects 1028 ); 1029 } 1030 1031 void ShenandoahVerifier::verify_before_updaterefs() { 1032 verify_at_safepoint( 1033 "Before Updating References", 1034 _verify_remembered_for_updating_references, // verify read-write remembered set 1035 _verify_forwarded_allow, // forwarded references allowed 1036 _verify_marked_complete, // bitmaps might be stale, but alloc-after-mark should be well 1037 _verify_cset_forwarded, // all cset refs are fully forwarded 1038 _verify_liveness_disable, // no reliable liveness data anymore 1039 _verify_regions_notrash, // trash regions have been recycled already 1040 _verify_gcstate_updating // evacuation should have produced some forwarded objects 1041 ); 1042 } 1043 1044 void ShenandoahVerifier::verify_after_updaterefs() { 1045 verify_at_safepoint( 1046 "After Updating References", 1047 _verify_remembered_disable, // do not verify remembered set 1048 _verify_forwarded_none, // no forwarded references 1049 _verify_marked_complete, // bitmaps might be stale, but alloc-after-mark should be well 1050 _verify_cset_none, // no cset references, all updated 1051 _verify_liveness_disable, // no reliable liveness data anymore 1052 _verify_regions_nocset, // no cset regions, trash regions have appeared 1053 _verify_gcstate_stable // update refs had cleaned up forwarded objects 1054 ); 1055 } 1056 1057 void ShenandoahVerifier::verify_after_degenerated() { 1058 verify_at_safepoint( 1059 "After Degenerated GC", 1060 _verify_remembered_disable, // do not verify remembered set 1061 _verify_forwarded_none, // all objects are non-forwarded 1062 _verify_marked_complete, // all objects are marked in complete bitmap 1063 _verify_cset_none, // no cset references 1064 _verify_liveness_disable, // no reliable liveness data anymore 1065 _verify_regions_notrash_nocset, // no trash, no cset 1066 _verify_gcstate_stable // degenerated refs had cleaned up forwarded objects 1067 ); 1068 } 1069 1070 void ShenandoahVerifier::verify_before_fullgc() { 1071 verify_at_safepoint( 1072 "Before Full GC", 1073 _verify_remembered_disable, // do not verify remembered set 1074 _verify_forwarded_allow, // can have forwarded objects 1075 _verify_marked_disable, // do not verify marked: lots ot time wasted checking dead allocations 1076 _verify_cset_disable, // cset might be foobared 1077 _verify_liveness_disable, // no reliable liveness data anymore 1078 _verify_regions_disable, // no reliable region data here 1079 _verify_gcstate_disable // no reliable gcstate data 1080 ); 1081 } 1082 1083 void ShenandoahVerifier::verify_after_generational_fullgc() { 1084 verify_at_safepoint( 1085 "After Full Generational GC", 1086 _verify_remembered_after_full_gc, // verify read-write remembered set 1087 _verify_forwarded_none, // all objects are non-forwarded 1088 _verify_marked_complete, // all objects are marked in complete bitmap 1089 _verify_cset_none, // no cset references 1090 _verify_liveness_disable, // no reliable liveness data anymore 1091 _verify_regions_notrash_nocset, // no trash, no cset 1092 _verify_gcstate_stable // full gc cleaned up everything 1093 ); 1094 } 1095 1096 void ShenandoahVerifier::verify_after_fullgc() { 1097 verify_at_safepoint( 1098 "After Full GC", 1099 _verify_remembered_disable, // do not verify remembered set 1100 _verify_forwarded_none, // all objects are non-forwarded 1101 _verify_marked_complete, // all objects are marked in complete bitmap 1102 _verify_cset_none, // no cset references 1103 _verify_liveness_disable, // no reliable liveness data anymore 1104 _verify_regions_notrash_nocset, // no trash, no cset 1105 _verify_gcstate_stable // full gc cleaned up everything 1106 ); 1107 } 1108 1109 class ShenandoahVerifyNoForwared : public BasicOopIterateClosure { 1110 private: 1111 template <class T> 1112 void do_oop_work(T* p) { 1113 T o = RawAccess<>::oop_load(p); 1114 if (!CompressedOops::is_null(o)) { 1115 oop obj = CompressedOops::decode_not_null(o); 1116 oop fwd = ShenandoahForwarding::get_forwardee_raw_unchecked(obj); 1117 if (obj != fwd) { 1118 ShenandoahAsserts::print_failure(ShenandoahAsserts::_safe_all, obj, p, NULL, 1119 "Verify Roots", "Should not be forwarded", __FILE__, __LINE__); 1120 } 1121 } 1122 } 1123 1124 public: 1125 void do_oop(narrowOop* p) { do_oop_work(p); } 1126 void do_oop(oop* p) { do_oop_work(p); } 1127 }; 1128 1129 class ShenandoahVerifyInToSpaceClosure : public BasicOopIterateClosure { 1130 private: 1131 template <class T> 1132 void do_oop_work(T* p) { 1133 T o = RawAccess<>::oop_load(p); 1134 if (!CompressedOops::is_null(o)) { 1135 oop obj = CompressedOops::decode_not_null(o); 1136 ShenandoahHeap* heap = ShenandoahHeap::heap(); 1137 1138 if (!heap->marking_context()->is_marked_or_old(obj)) { 1139 ShenandoahAsserts::print_failure(ShenandoahAsserts::_safe_all, obj, p, NULL, 1140 "Verify Roots In To-Space", "Should be marked", __FILE__, __LINE__); 1141 } 1142 1143 if (heap->in_collection_set(obj)) { 1144 ShenandoahAsserts::print_failure(ShenandoahAsserts::_safe_all, obj, p, NULL, 1145 "Verify Roots In To-Space", "Should not be in collection set", __FILE__, __LINE__); 1146 } 1147 1148 oop fwd = ShenandoahForwarding::get_forwardee_raw_unchecked(obj); 1149 if (obj != fwd) { 1150 ShenandoahAsserts::print_failure(ShenandoahAsserts::_safe_all, obj, p, NULL, 1151 "Verify Roots In To-Space", "Should not be forwarded", __FILE__, __LINE__); 1152 } 1153 } 1154 } 1155 1156 public: 1157 void do_oop(narrowOop* p) { do_oop_work(p); } 1158 void do_oop(oop* p) { do_oop_work(p); } 1159 }; 1160 1161 void ShenandoahVerifier::verify_roots_in_to_space() { 1162 ShenandoahVerifyInToSpaceClosure cl; 1163 ShenandoahRootVerifier::roots_do(&cl); 1164 } 1165 1166 void ShenandoahVerifier::verify_roots_no_forwarded() { 1167 ShenandoahVerifyNoForwared cl; 1168 ShenandoahRootVerifier::roots_do(&cl); 1169 }