1 /*
2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "logging/log.hpp"
27 #include "gc/g1/concurrentMarkThread.hpp"
28 #include "gc/g1/g1Allocator.inline.hpp"
29 #include "gc/g1/g1CollectedHeap.hpp"
30 #include "gc/g1/g1CollectedHeap.inline.hpp"
31 #include "gc/g1/g1HeapVerifier.hpp"
32 #include "gc/g1/g1Policy.hpp"
33 #include "gc/g1/g1RemSet.hpp"
34 #include "gc/g1/g1RootProcessor.hpp"
35 #include "gc/g1/heapRegion.hpp"
36 #include "gc/g1/heapRegion.inline.hpp"
37 #include "gc/g1/heapRegionRemSet.hpp"
38 #include "gc/g1/g1StringDedup.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "oops/oop.inline.hpp"
41
42 class VerifyRootsClosure: public OopClosure {
43 private:
44 G1CollectedHeap* _g1h;
45 VerifyOption _vo;
46 bool _failures;
47 public:
48 // _vo == UsePrevMarking -> use "prev" marking information,
49 // _vo == UseNextMarking -> use "next" marking information,
50 // _vo == UseMarkWord -> use mark word from object header.
51 VerifyRootsClosure(VerifyOption vo) :
52 _g1h(G1CollectedHeap::heap()),
53 _vo(vo),
54 _failures(false) { }
55
56 bool failures() { return _failures; }
57
58 template <class T> void do_oop_nv(T* p) {
59 T heap_oop = oopDesc::load_heap_oop(p);
60 if (!oopDesc::is_null(heap_oop)) {
61 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
62 if (_g1h->is_obj_dead_cond(obj, _vo)) {
63 Log(gc, verify) log;
64 log.info("Root location " PTR_FORMAT " points to dead obj " PTR_FORMAT, p2i(p), p2i(obj));
65 if (_vo == VerifyOption_G1UseMarkWord) {
66 log.error(" Mark word: " PTR_FORMAT, p2i(obj->mark()));
67 }
68 ResourceMark rm;
69 obj->print_on(log.error_stream());
70 _failures = true;
71 }
72 }
73 }
74
75 void do_oop(oop* p) { do_oop_nv(p); }
76 void do_oop(narrowOop* p) { do_oop_nv(p); }
77 };
78
79 class G1VerifyCodeRootOopClosure: public OopClosure {
80 G1CollectedHeap* _g1h;
81 OopClosure* _root_cl;
82 nmethod* _nm;
83 VerifyOption _vo;
84 bool _failures;
85
86 template <class T> void do_oop_work(T* p) {
87 // First verify that this root is live
88 _root_cl->do_oop(p);
89
90 if (!G1VerifyHeapRegionCodeRoots) {
91 // We're not verifying the code roots attached to heap region.
92 return;
93 }
94
95 // Don't check the code roots during marking verification in a full GC
96 if (_vo == VerifyOption_G1UseMarkWord) {
97 return;
98 }
99
100 // Now verify that the current nmethod (which contains p) is
101 // in the code root list of the heap region containing the
102 // object referenced by p.
103
104 T heap_oop = oopDesc::load_heap_oop(p);
105 if (!oopDesc::is_null(heap_oop)) {
106 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
107
108 // Now fetch the region containing the object
109 HeapRegion* hr = _g1h->heap_region_containing(obj);
110 HeapRegionRemSet* hrrs = hr->rem_set();
111 // Verify that the strong code root list for this region
112 // contains the nmethod
113 if (!hrrs->strong_code_roots_list_contains(_nm)) {
114 log_error(gc, verify)("Code root location " PTR_FORMAT " "
115 "from nmethod " PTR_FORMAT " not in strong "
116 "code roots for region [" PTR_FORMAT "," PTR_FORMAT ")",
117 p2i(p), p2i(_nm), p2i(hr->bottom()), p2i(hr->end()));
118 _failures = true;
119 }
120 }
121 }
122
123 public:
124 G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo):
125 _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {}
126
127 void do_oop(oop* p) { do_oop_work(p); }
128 void do_oop(narrowOop* p) { do_oop_work(p); }
129
130 void set_nmethod(nmethod* nm) { _nm = nm; }
131 bool failures() { return _failures; }
132 };
133
134 class G1VerifyCodeRootBlobClosure: public CodeBlobClosure {
135 G1VerifyCodeRootOopClosure* _oop_cl;
136
137 public:
138 G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl):
139 _oop_cl(oop_cl) {}
140
141 void do_code_blob(CodeBlob* cb) {
142 nmethod* nm = cb->as_nmethod_or_null();
143 if (nm != NULL) {
144 _oop_cl->set_nmethod(nm);
145 nm->oops_do(_oop_cl);
146 }
147 }
148 };
149
150 class YoungRefCounterClosure : public OopClosure {
151 G1CollectedHeap* _g1h;
152 int _count;
153 public:
154 YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {}
155 void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } }
156 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
157
158 int count() { return _count; }
159 void reset_count() { _count = 0; };
160 };
161
162 class VerifyKlassClosure: public KlassClosure {
163 YoungRefCounterClosure _young_ref_counter_closure;
164 OopClosure *_oop_closure;
165 public:
166 VerifyKlassClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {}
167 void do_klass(Klass* k) {
168 k->oops_do(_oop_closure);
169
170 _young_ref_counter_closure.reset_count();
171 k->oops_do(&_young_ref_counter_closure);
172 if (_young_ref_counter_closure.count() > 0) {
173 guarantee(k->has_modified_oops(), "Klass " PTR_FORMAT ", has young refs but is not dirty.", p2i(k));
174 }
175 }
176 };
177
178 class VerifyLivenessOopClosure: public OopClosure {
179 G1CollectedHeap* _g1h;
180 VerifyOption _vo;
181 public:
182 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo):
183 _g1h(g1h), _vo(vo)
184 { }
185 void do_oop(narrowOop *p) { do_oop_work(p); }
186 void do_oop( oop *p) { do_oop_work(p); }
187
188 template <class T> void do_oop_work(T *p) {
189 oop obj = oopDesc::load_decode_heap_oop(p);
190 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo),
191 "Dead object referenced by a not dead object");
192 }
193 };
194
195 class VerifyObjsInRegionClosure: public ObjectClosure {
196 private:
197 G1CollectedHeap* _g1h;
198 size_t _live_bytes;
199 HeapRegion *_hr;
200 VerifyOption _vo;
201 public:
202 // _vo == UsePrevMarking -> use "prev" marking information,
203 // _vo == UseNextMarking -> use "next" marking information,
204 // _vo == UseMarkWord -> use mark word from object header.
205 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo)
206 : _live_bytes(0), _hr(hr), _vo(vo) {
207 _g1h = G1CollectedHeap::heap();
208 }
209 void do_object(oop o) {
210 VerifyLivenessOopClosure isLive(_g1h, _vo);
211 assert(o != NULL, "Huh?");
212 if (!_g1h->is_obj_dead_cond(o, _vo)) {
213 // If the object is alive according to the mark word,
214 // then verify that the marking information agrees.
215 // Note we can't verify the contra-positive of the
216 // above: if the object is dead (according to the mark
217 // word), it may not be marked, or may have been marked
218 // but has since became dead, or may have been allocated
219 // since the last marking.
220 if (_vo == VerifyOption_G1UseMarkWord) {
221 guarantee(!_g1h->is_obj_dead(o), "mark word and concurrent mark mismatch");
222 }
223
224 o->oop_iterate_no_header(&isLive);
225 if (!_hr->obj_allocated_since_prev_marking(o)) {
226 size_t obj_size = o->size(); // Make sure we don't overflow
227 _live_bytes += (obj_size * HeapWordSize);
228 }
229 }
230 }
231 size_t live_bytes() { return _live_bytes; }
232 };
233
234 class VerifyArchiveOopClosure: public OopClosure {
235 public:
236 VerifyArchiveOopClosure(HeapRegion *hr) { }
237 void do_oop(narrowOop *p) { do_oop_work(p); }
238 void do_oop( oop *p) { do_oop_work(p); }
239
240 template <class T> void do_oop_work(T *p) {
241 oop obj = oopDesc::load_decode_heap_oop(p);
242 guarantee(obj == NULL || G1ArchiveAllocator::is_archive_object(obj),
243 "Archive object at " PTR_FORMAT " references a non-archive object at " PTR_FORMAT,
244 p2i(p), p2i(obj));
245 }
246 };
247
248 class VerifyArchiveRegionClosure: public ObjectClosure {
249 public:
250 VerifyArchiveRegionClosure(HeapRegion *hr) { }
251 // Verify that all object pointers are to archive regions.
252 void do_object(oop o) {
253 VerifyArchiveOopClosure checkOop(NULL);
254 assert(o != NULL, "Should not be here for NULL oops");
255 o->oop_iterate_no_header(&checkOop);
256 }
257 };
258
259 class VerifyRegionClosure: public HeapRegionClosure {
260 private:
261 bool _par;
262 VerifyOption _vo;
263 bool _failures;
264 public:
265 // _vo == UsePrevMarking -> use "prev" marking information,
266 // _vo == UseNextMarking -> use "next" marking information,
267 // _vo == UseMarkWord -> use mark word from object header.
268 VerifyRegionClosure(bool par, VerifyOption vo)
269 : _par(par),
270 _vo(vo),
271 _failures(false) {}
272
273 bool failures() {
274 return _failures;
275 }
276
277 bool doHeapRegion(HeapRegion* r) {
278 // For archive regions, verify there are no heap pointers to
279 // non-pinned regions. For all others, verify liveness info.
280 if (r->is_archive()) {
281 VerifyArchiveRegionClosure verify_oop_pointers(r);
282 r->object_iterate(&verify_oop_pointers);
283 return true;
284 }
285 if (!r->is_continues_humongous()) {
286 bool failures = false;
287 r->verify(_vo, &failures);
288 if (failures) {
289 _failures = true;
290 } else if (!r->is_starts_humongous()) {
291 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo);
292 r->object_iterate(¬_dead_yet_cl);
293 if (_vo != VerifyOption_G1UseNextMarking) {
294 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) {
295 log_error(gc, verify)("[" PTR_FORMAT "," PTR_FORMAT "] max_live_bytes " SIZE_FORMAT " < calculated " SIZE_FORMAT,
296 p2i(r->bottom()), p2i(r->end()), r->max_live_bytes(), not_dead_yet_cl.live_bytes());
297 _failures = true;
298 }
299 } else {
300 // When vo == UseNextMarking we cannot currently do a sanity
301 // check on the live bytes as the calculation has not been
302 // finalized yet.
303 }
304 }
305 }
306 return false; // stop the region iteration if we hit a failure
307 }
308 };
309
310 // This is the task used for parallel verification of the heap regions
311
312 class G1ParVerifyTask: public AbstractGangTask {
313 private:
314 G1CollectedHeap* _g1h;
315 VerifyOption _vo;
316 bool _failures;
317 HeapRegionClaimer _hrclaimer;
318
319 public:
320 // _vo == UsePrevMarking -> use "prev" marking information,
321 // _vo == UseNextMarking -> use "next" marking information,
322 // _vo == UseMarkWord -> use mark word from object header.
323 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) :
324 AbstractGangTask("Parallel verify task"),
325 _g1h(g1h),
326 _vo(vo),
327 _failures(false),
328 _hrclaimer(g1h->workers()->active_workers()) {}
329
330 bool failures() {
331 return _failures;
332 }
333
334 void work(uint worker_id) {
335 HandleMark hm;
336 VerifyRegionClosure blk(true, _vo);
337 _g1h->heap_region_par_iterate(&blk, worker_id, &_hrclaimer);
338 if (blk.failures()) {
339 _failures = true;
340 }
341 }
342 };
343
344
345 void G1HeapVerifier::verify(VerifyOption vo) {
346 if (!SafepointSynchronize::is_at_safepoint()) {
347 log_info(gc, verify)("Skipping verification. Not at safepoint.");
348 }
349
350 assert(Thread::current()->is_VM_thread(),
351 "Expected to be executed serially by the VM thread at this point");
352
353 log_debug(gc, verify)("Roots");
354 VerifyRootsClosure rootsCl(vo);
355 VerifyKlassClosure klassCl(_g1h, &rootsCl);
356 CLDToKlassAndOopClosure cldCl(&klassCl, &rootsCl, false);
357
358 // We apply the relevant closures to all the oops in the
359 // system dictionary, class loader data graph, the string table
360 // and the nmethods in the code cache.
361 G1VerifyCodeRootOopClosure codeRootsCl(_g1h, &rootsCl, vo);
362 G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl);
363
364 {
365 G1RootProcessor root_processor(_g1h, 1);
366 root_processor.process_all_roots(&rootsCl,
367 &cldCl,
368 &blobsCl);
369 }
370
371 bool failures = rootsCl.failures() || codeRootsCl.failures();
372
373 if (vo != VerifyOption_G1UseMarkWord) {
374 // If we're verifying during a full GC then the region sets
375 // will have been torn down at the start of the GC. Therefore
376 // verifying the region sets will fail. So we only verify
377 // the region sets when not in a full GC.
378 log_debug(gc, verify)("HeapRegionSets");
379 verify_region_sets();
380 }
381
382 log_debug(gc, verify)("HeapRegions");
383 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) {
384
385 G1ParVerifyTask task(_g1h, vo);
386 _g1h->workers()->run_task(&task);
387 if (task.failures()) {
388 failures = true;
389 }
390
391 } else {
392 VerifyRegionClosure blk(false, vo);
393 _g1h->heap_region_iterate(&blk);
394 if (blk.failures()) {
395 failures = true;
396 }
397 }
398
399 if (G1StringDedup::is_enabled()) {
400 log_debug(gc, verify)("StrDedup");
401 G1StringDedup::verify();
402 }
403
404 if (failures) {
405 log_error(gc, verify)("Heap after failed verification:");
406 // It helps to have the per-region information in the output to
407 // help us track down what went wrong. This is why we call
408 // print_extended_on() instead of print_on().
409 Log(gc, verify) log;
410 ResourceMark rm;
411 _g1h->print_extended_on(log.error_stream());
412 }
413 guarantee(!failures, "there should not have been any failures");
414 }
415
416 // Heap region set verification
417
418 class VerifyRegionListsClosure : public HeapRegionClosure {
419 private:
420 HeapRegionSet* _old_set;
421 HeapRegionSet* _humongous_set;
422 HeapRegionManager* _hrm;
423
424 public:
425 uint _old_count;
426 uint _humongous_count;
427 uint _free_count;
428
429 VerifyRegionListsClosure(HeapRegionSet* old_set,
430 HeapRegionSet* humongous_set,
431 HeapRegionManager* hrm) :
432 _old_set(old_set), _humongous_set(humongous_set), _hrm(hrm),
433 _old_count(), _humongous_count(), _free_count(){ }
434
435 bool doHeapRegion(HeapRegion* hr) {
436 if (hr->is_young()) {
437 // TODO
438 } else if (hr->is_humongous()) {
439 assert(hr->containing_set() == _humongous_set, "Heap region %u is humongous but not in humongous set.", hr->hrm_index());
440 _humongous_count++;
441 } else if (hr->is_empty()) {
442 assert(_hrm->is_free(hr), "Heap region %u is empty but not on the free list.", hr->hrm_index());
443 _free_count++;
444 } else if (hr->is_old()) {
445 assert(hr->containing_set() == _old_set, "Heap region %u is old but not in the old set.", hr->hrm_index());
446 _old_count++;
447 } else {
448 // There are no other valid region types. Check for one invalid
449 // one we can identify: pinned without old or humongous set.
450 assert(!hr->is_pinned(), "Heap region %u is pinned but not old (archive) or humongous.", hr->hrm_index());
451 ShouldNotReachHere();
452 }
453 return false;
454 }
455
456 void verify_counts(HeapRegionSet* old_set, HeapRegionSet* humongous_set, HeapRegionManager* free_list) {
457 guarantee(old_set->length() == _old_count, "Old set count mismatch. Expected %u, actual %u.", old_set->length(), _old_count);
458 guarantee(humongous_set->length() == _humongous_count, "Hum set count mismatch. Expected %u, actual %u.", humongous_set->length(), _humongous_count);
459 guarantee(free_list->num_free_regions() == _free_count, "Free list count mismatch. Expected %u, actual %u.", free_list->num_free_regions(), _free_count);
460 }
461 };
462
463 void G1HeapVerifier::verify_region_sets() {
464 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
465
466 // First, check the explicit lists.
467 _g1h->_hrm.verify();
468 {
469 // Given that a concurrent operation might be adding regions to
470 // the secondary free list we have to take the lock before
471 // verifying it.
472 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag);
473 _g1h->_secondary_free_list.verify_list();
474 }
475
476 // If a concurrent region freeing operation is in progress it will
477 // be difficult to correctly attributed any free regions we come
478 // across to the correct free list given that they might belong to
479 // one of several (free_list, secondary_free_list, any local lists,
480 // etc.). So, if that's the case we will skip the rest of the
481 // verification operation. Alternatively, waiting for the concurrent
482 // operation to complete will have a non-trivial effect on the GC's
483 // operation (no concurrent operation will last longer than the
484 // interval between two calls to verification) and it might hide
485 // any issues that we would like to catch during testing.
486 if (_g1h->free_regions_coming()) {
487 return;
488 }
489
490 // Make sure we append the secondary_free_list on the free_list so
491 // that all free regions we will come across can be safely
492 // attributed to the free_list.
493 _g1h->append_secondary_free_list_if_not_empty_with_lock();
494
495 // Finally, make sure that the region accounting in the lists is
496 // consistent with what we see in the heap.
497
498 VerifyRegionListsClosure cl(&_g1h->_old_set, &_g1h->_humongous_set, &_g1h->_hrm);
499 _g1h->heap_region_iterate(&cl);
500 cl.verify_counts(&_g1h->_old_set, &_g1h->_humongous_set, &_g1h->_hrm);
501 }
502
503 void G1HeapVerifier::prepare_for_verify() {
504 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) {
505 _g1h->ensure_parsability(false);
506 }
507 }
508
509 double G1HeapVerifier::verify(bool guard, const char* msg) {
510 double verify_time_ms = 0.0;
511
512 if (guard && _g1h->total_collections() >= VerifyGCStartAt) {
513 double verify_start = os::elapsedTime();
514 HandleMark hm; // Discard invalid handles created during verification
515 prepare_for_verify();
516 Universe::verify(VerifyOption_G1UsePrevMarking, msg);
517 verify_time_ms = (os::elapsedTime() - verify_start) * 1000;
518 }
519
520 return verify_time_ms;
521 }
522
523 void G1HeapVerifier::verify_before_gc() {
524 double verify_time_ms = verify(VerifyBeforeGC, "Before GC");
525 _g1h->g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms);
526 }
527
528 void G1HeapVerifier::verify_after_gc() {
529 double verify_time_ms = verify(VerifyAfterGC, "After GC");
530 _g1h->g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms);
531 }
532
533
534 #ifndef PRODUCT
535 class G1VerifyCardTableCleanup: public HeapRegionClosure {
536 G1HeapVerifier* _verifier;
537 G1SATBCardTableModRefBS* _ct_bs;
538 public:
539 G1VerifyCardTableCleanup(G1HeapVerifier* verifier, G1SATBCardTableModRefBS* ct_bs)
540 : _verifier(verifier), _ct_bs(ct_bs) { }
541 virtual bool doHeapRegion(HeapRegion* r) {
542 if (r->is_survivor()) {
543 _verifier->verify_dirty_region(r);
544 } else {
545 _verifier->verify_not_dirty_region(r);
546 }
547 return false;
548 }
549 };
550
551 void G1HeapVerifier::verify_card_table_cleanup() {
552 if (G1VerifyCTCleanup || VerifyAfterGC) {
553 G1VerifyCardTableCleanup cleanup_verifier(this, _g1h->g1_barrier_set());
554 _g1h->heap_region_iterate(&cleanup_verifier);
555 }
556 }
557
558 void G1HeapVerifier::verify_not_dirty_region(HeapRegion* hr) {
559 // All of the region should be clean.
560 G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
561 MemRegion mr(hr->bottom(), hr->end());
562 ct_bs->verify_not_dirty_region(mr);
563 }
564
565 void G1HeapVerifier::verify_dirty_region(HeapRegion* hr) {
566 // We cannot guarantee that [bottom(),end()] is dirty. Threads
567 // dirty allocated blocks as they allocate them. The thread that
568 // retires each region and replaces it with a new one will do a
569 // maximal allocation to fill in [pre_dummy_top(),end()] but will
570 // not dirty that area (one less thing to have to do while holding
571 // a lock). So we can only verify that [bottom(),pre_dummy_top()]
572 // is dirty.
573 G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
574 MemRegion mr(hr->bottom(), hr->pre_dummy_top());
575 if (hr->is_young()) {
576 ct_bs->verify_g1_young_region(mr);
577 } else {
578 ct_bs->verify_dirty_region(mr);
579 }
580 }
581
582 class G1VerifyDirtyYoungListClosure : public HeapRegionClosure {
583 private:
584 G1HeapVerifier* _verifier;
585 public:
586 G1VerifyDirtyYoungListClosure(G1HeapVerifier* verifier) : HeapRegionClosure(), _verifier(verifier) { }
587 virtual bool doHeapRegion(HeapRegion* r) {
588 _verifier->verify_dirty_region(r);
589 return false;
590 }
591 };
592
593 void G1HeapVerifier::verify_dirty_young_regions() {
594 G1VerifyDirtyYoungListClosure cl(this);
595 _g1h->collection_set()->iterate(&cl);
596 }
597
598 bool G1HeapVerifier::verify_no_bits_over_tams(const char* bitmap_name, G1CMBitMapRO* bitmap,
599 HeapWord* tams, HeapWord* end) {
600 guarantee(tams <= end,
601 "tams: " PTR_FORMAT " end: " PTR_FORMAT, p2i(tams), p2i(end));
602 HeapWord* result = bitmap->getNextMarkedWordAddress(tams, end);
603 if (result < end) {
604 log_error(gc, verify)("## wrong marked address on %s bitmap: " PTR_FORMAT, bitmap_name, p2i(result));
605 log_error(gc, verify)("## %s tams: " PTR_FORMAT " end: " PTR_FORMAT, bitmap_name, p2i(tams), p2i(end));
606 return false;
607 }
608 return true;
609 }
610
611 bool G1HeapVerifier::verify_bitmaps(const char* caller, HeapRegion* hr) {
612 G1CMBitMapRO* prev_bitmap = _g1h->concurrent_mark()->prevMarkBitMap();
613 G1CMBitMapRO* next_bitmap = (G1CMBitMapRO*) _g1h->concurrent_mark()->nextMarkBitMap();
614
615 HeapWord* bottom = hr->bottom();
616 HeapWord* ptams = hr->prev_top_at_mark_start();
617 HeapWord* ntams = hr->next_top_at_mark_start();
618 HeapWord* end = hr->end();
619
620 bool res_p = verify_no_bits_over_tams("prev", prev_bitmap, ptams, end);
621
622 bool res_n = true;
623 // We reset mark_in_progress() before we reset _cmThread->in_progress() and in this window
624 // we do the clearing of the next bitmap concurrently. Thus, we can not verify the bitmap
625 // if we happen to be in that state.
626 if (_g1h->collector_state()->mark_in_progress() || !_g1h->_cmThread->in_progress()) {
627 res_n = verify_no_bits_over_tams("next", next_bitmap, ntams, end);
628 }
629 if (!res_p || !res_n) {
630 log_error(gc, verify)("#### Bitmap verification failed for " HR_FORMAT, HR_FORMAT_PARAMS(hr));
631 log_error(gc, verify)("#### Caller: %s", caller);
632 return false;
633 }
634 return true;
635 }
636
637 void G1HeapVerifier::check_bitmaps(const char* caller, HeapRegion* hr) {
638 if (!G1VerifyBitmaps) return;
639
640 guarantee(verify_bitmaps(caller, hr), "bitmap verification");
641 }
642
643 class G1VerifyBitmapClosure : public HeapRegionClosure {
644 private:
645 const char* _caller;
646 G1HeapVerifier* _verifier;
647 bool _failures;
648
649 public:
650 G1VerifyBitmapClosure(const char* caller, G1HeapVerifier* verifier) :
651 _caller(caller), _verifier(verifier), _failures(false) { }
652
653 bool failures() { return _failures; }
654
655 virtual bool doHeapRegion(HeapRegion* hr) {
656 bool result = _verifier->verify_bitmaps(_caller, hr);
657 if (!result) {
658 _failures = true;
659 }
660 return false;
661 }
662 };
663
664 void G1HeapVerifier::check_bitmaps(const char* caller) {
665 if (!G1VerifyBitmaps) return;
666
667 G1VerifyBitmapClosure cl(caller, this);
668 _g1h->heap_region_iterate(&cl);
669 guarantee(!cl.failures(), "bitmap verification");
670 }
671
672 class G1CheckCSetFastTableClosure : public HeapRegionClosure {
673 private:
674 bool _failures;
675 public:
676 G1CheckCSetFastTableClosure() : HeapRegionClosure(), _failures(false) { }
677
678 virtual bool doHeapRegion(HeapRegion* hr) {
679 uint i = hr->hrm_index();
680 InCSetState cset_state = (InCSetState) G1CollectedHeap::heap()->_in_cset_fast_test.get_by_index(i);
681 if (hr->is_humongous()) {
682 if (hr->in_collection_set()) {
683 log_error(gc, verify)("## humongous region %u in CSet", i);
684 _failures = true;
685 return true;
686 }
687 if (cset_state.is_in_cset()) {
688 log_error(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for humongous region %u", cset_state.value(), i);
689 _failures = true;
690 return true;
691 }
692 if (hr->is_continues_humongous() && cset_state.is_humongous()) {
693 log_error(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for continues humongous region %u", cset_state.value(), i);
694 _failures = true;
695 return true;
696 }
697 } else {
698 if (cset_state.is_humongous()) {
699 log_error(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for non-humongous region %u", cset_state.value(), i);
700 _failures = true;
701 return true;
702 }
703 if (hr->in_collection_set() != cset_state.is_in_cset()) {
704 log_error(gc, verify)("## in CSet %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
705 hr->in_collection_set(), cset_state.value(), i);
706 _failures = true;
707 return true;
708 }
709 if (cset_state.is_in_cset()) {
710 if (hr->is_young() != (cset_state.is_young())) {
711 log_error(gc, verify)("## is_young %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
712 hr->is_young(), cset_state.value(), i);
713 _failures = true;
714 return true;
715 }
716 if (hr->is_old() != (cset_state.is_old())) {
717 log_error(gc, verify)("## is_old %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
718 hr->is_old(), cset_state.value(), i);
719 _failures = true;
720 return true;
721 }
722 }
723 }
724 return false;
725 }
726
727 bool failures() const { return _failures; }
728 };
729
730 bool G1HeapVerifier::check_cset_fast_test() {
731 G1CheckCSetFastTableClosure cl;
732 _g1h->_hrm.iterate(&cl);
733 return !cl.failures();
734 }
735 #endif // PRODUCT