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 "gc/g1/concurrentMarkThread.hpp"
27 #include "gc/g1/g1Allocator.inline.hpp"
28 #include "gc/g1/g1CollectedHeap.hpp"
29 #include "gc/g1/g1CollectedHeap.inline.hpp"
30 #include "gc/g1/g1HeapVerifier.hpp"
31 #include "gc/g1/g1Policy.hpp"
32 #include "gc/g1/g1RemSet.hpp"
33 #include "gc/g1/g1RootProcessor.hpp"
34 #include "gc/g1/heapRegion.hpp"
35 #include "gc/g1/heapRegion.inline.hpp"
36 #include "gc/g1/heapRegionRemSet.hpp"
37 #include "gc/g1/g1StringDedup.hpp"
38 #include "logging/log.hpp"
39 #include "logging/logStream.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/oop.inline.hpp"
42
43 class VerifyRootsClosure: public OopClosure {
44 private:
45 G1CollectedHeap* _g1h;
46 VerifyOption _vo;
47 bool _failures;
48 public:
49 // _vo == UsePrevMarking -> use "prev" marking information,
50 // _vo == UseNextMarking -> use "next" marking information,
51 // _vo == UseFullMarking -> use "next" marking bitmap but no TAMS
52 VerifyRootsClosure(VerifyOption vo) :
53 _g1h(G1CollectedHeap::heap()),
54 _vo(vo),
55 _failures(false) { }
56
57 bool failures() { return _failures; }
58
59 template <class T> void do_oop_nv(T* p) {
60 T heap_oop = oopDesc::load_heap_oop(p);
61 if (!oopDesc::is_null(heap_oop)) {
62 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
63 if (_g1h->is_obj_dead_cond(obj, _vo)) {
64 Log(gc, verify) log;
65 log.error("Root location " PTR_FORMAT " points to dead obj " PTR_FORMAT, p2i(p), p2i(obj));
66 ResourceMark rm;
67 LogStream ls(log.error());
68 obj->print_on(&ls);
69 _failures = true;
70 }
71 }
72 }
73
74 void do_oop(oop* p) { do_oop_nv(p); }
75 void do_oop(narrowOop* p) { do_oop_nv(p); }
76 };
77
78 class G1VerifyCodeRootOopClosure: public OopClosure {
79 G1CollectedHeap* _g1h;
80 OopClosure* _root_cl;
81 nmethod* _nm;
82 VerifyOption _vo;
83 bool _failures;
84
85 template <class T> void do_oop_work(T* p) {
86 // First verify that this root is live
87 _root_cl->do_oop(p);
88
89 if (!G1VerifyHeapRegionCodeRoots) {
90 // We're not verifying the code roots attached to heap region.
91 return;
92 }
93
94 // Don't check the code roots during marking verification in a full GC
95 if (_vo == VerifyOption_G1UseFullMarking) {
96 return;
97 }
98
99 // Now verify that the current nmethod (which contains p) is
100 // in the code root list of the heap region containing the
101 // object referenced by p.
102
103 T heap_oop = oopDesc::load_heap_oop(p);
104 if (!oopDesc::is_null(heap_oop)) {
105 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
106
107 // Now fetch the region containing the object
108 HeapRegion* hr = _g1h->heap_region_containing(obj);
109 HeapRegionRemSet* hrrs = hr->rem_set();
110 // Verify that the strong code root list for this region
111 // contains the nmethod
112 if (!hrrs->strong_code_roots_list_contains(_nm)) {
113 log_error(gc, verify)("Code root location " PTR_FORMAT " "
114 "from nmethod " PTR_FORMAT " not in strong "
115 "code roots for region [" PTR_FORMAT "," PTR_FORMAT ")",
116 p2i(p), p2i(_nm), p2i(hr->bottom()), p2i(hr->end()));
117 _failures = true;
118 }
119 }
120 }
121
122 public:
123 G1VerifyCodeRootOopClosure(G1CollectedHeap* g1h, OopClosure* root_cl, VerifyOption vo):
124 _g1h(g1h), _root_cl(root_cl), _vo(vo), _nm(NULL), _failures(false) {}
125
126 void do_oop(oop* p) { do_oop_work(p); }
127 void do_oop(narrowOop* p) { do_oop_work(p); }
128
129 void set_nmethod(nmethod* nm) { _nm = nm; }
130 bool failures() { return _failures; }
131 };
132
133 class G1VerifyCodeRootBlobClosure: public CodeBlobClosure {
134 G1VerifyCodeRootOopClosure* _oop_cl;
135
136 public:
137 G1VerifyCodeRootBlobClosure(G1VerifyCodeRootOopClosure* oop_cl):
138 _oop_cl(oop_cl) {}
139
140 void do_code_blob(CodeBlob* cb) {
141 nmethod* nm = cb->as_nmethod_or_null();
142 if (nm != NULL) {
143 _oop_cl->set_nmethod(nm);
144 nm->oops_do(_oop_cl);
145 }
146 }
147 };
148
149 class YoungRefCounterClosure : public OopClosure {
150 G1CollectedHeap* _g1h;
151 int _count;
152 public:
153 YoungRefCounterClosure(G1CollectedHeap* g1h) : _g1h(g1h), _count(0) {}
154 void do_oop(oop* p) { if (_g1h->is_in_young(*p)) { _count++; } }
155 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
156
157 int count() { return _count; }
158 void reset_count() { _count = 0; };
159 };
160
161 class VerifyCLDClosure: public CLDClosure {
162 YoungRefCounterClosure _young_ref_counter_closure;
163 OopClosure *_oop_closure;
164 public:
165 VerifyCLDClosure(G1CollectedHeap* g1h, OopClosure* cl) : _young_ref_counter_closure(g1h), _oop_closure(cl) {}
166 void do_cld(ClassLoaderData* cld) {
167 cld->oops_do(_oop_closure, false);
168
169 _young_ref_counter_closure.reset_count();
170 cld->oops_do(&_young_ref_counter_closure, false);
171 if (_young_ref_counter_closure.count() > 0) {
172 guarantee(cld->has_modified_oops(), "CLD " PTR_FORMAT ", has young %d refs but is not dirty.", p2i(cld), _young_ref_counter_closure.count());
173 }
174 }
175 };
176
177 class VerifyLivenessOopClosure: public OopClosure {
178 G1CollectedHeap* _g1h;
179 VerifyOption _vo;
180 public:
181 VerifyLivenessOopClosure(G1CollectedHeap* g1h, VerifyOption vo):
182 _g1h(g1h), _vo(vo)
183 { }
184 void do_oop(narrowOop *p) { do_oop_work(p); }
185 void do_oop( oop *p) { do_oop_work(p); }
186
187 template <class T> void do_oop_work(T *p) {
188 oop obj = oopDesc::load_decode_heap_oop(p);
189 guarantee(obj == NULL || !_g1h->is_obj_dead_cond(obj, _vo),
190 "Dead object referenced by a not dead object");
191 }
192 };
193
194 class VerifyObjsInRegionClosure: public ObjectClosure {
195 private:
196 G1CollectedHeap* _g1h;
197 size_t _live_bytes;
198 HeapRegion *_hr;
199 VerifyOption _vo;
200 public:
201 // _vo == UsePrevMarking -> use "prev" marking information,
202 // _vo == UseNextMarking -> use "next" marking information,
203 // _vo == UseFullMarking -> use "next" marking bitmap but no TAMS.
204 VerifyObjsInRegionClosure(HeapRegion *hr, VerifyOption vo)
205 : _live_bytes(0), _hr(hr), _vo(vo) {
206 _g1h = G1CollectedHeap::heap();
207 }
208 void do_object(oop o) {
209 VerifyLivenessOopClosure isLive(_g1h, _vo);
210 assert(o != NULL, "Huh?");
211 if (!_g1h->is_obj_dead_cond(o, _vo)) {
212 // If the object is alive according to the full gc mark,
213 // then verify that the marking information agrees.
214 // Note we can't verify the contra-positive of the
215 // above: if the object is dead (according to the mark
216 // word), it may not be marked, or may have been marked
217 // but has since became dead, or may have been allocated
218 // since the last marking.
219 if (_vo == VerifyOption_G1UseFullMarking) {
220 guarantee(!_g1h->is_obj_dead(o), "Full GC marking and concurrent mark mismatch");
221 }
222
223 o->oop_iterate_no_header(&isLive);
224 if (!_hr->obj_allocated_since_prev_marking(o)) {
225 size_t obj_size = o->size(); // Make sure we don't overflow
226 _live_bytes += (obj_size * HeapWordSize);
227 }
228 }
229 }
230 size_t live_bytes() { return _live_bytes; }
231 };
232
233 class VerifyArchiveOopClosure: public OopClosure {
234 HeapRegion* _hr;
235 public:
236 VerifyArchiveOopClosure(HeapRegion *hr)
237 : _hr(hr) { }
238 void do_oop(narrowOop *p) { do_oop_work(p); }
239 void do_oop( oop *p) { do_oop_work(p); }
240
241 template <class T> void do_oop_work(T *p) {
242 oop obj = oopDesc::load_decode_heap_oop(p);
243
244 if (_hr->is_open_archive()) {
245 guarantee(obj == NULL || G1ArchiveAllocator::is_archive_object(obj),
246 "Archive object at " PTR_FORMAT " references a non-archive object at " PTR_FORMAT,
247 p2i(p), p2i(obj));
248 } else {
249 assert(_hr->is_closed_archive(), "should be closed archive region");
250 guarantee(obj == NULL || G1ArchiveAllocator::is_closed_archive_object(obj),
251 "Archive object at " PTR_FORMAT " references a non-archive object at " PTR_FORMAT,
252 p2i(p), p2i(obj));
253 }
254 }
255 };
256
257 class VerifyObjectInArchiveRegionClosure: public ObjectClosure {
258 HeapRegion* _hr;
259 public:
260 VerifyObjectInArchiveRegionClosure(HeapRegion *hr, bool verbose)
261 : _hr(hr) { }
262 // Verify that all object pointers are to archive regions.
263 void do_object(oop o) {
264 VerifyArchiveOopClosure checkOop(_hr);
265 assert(o != NULL, "Should not be here for NULL oops");
266 o->oop_iterate_no_header(&checkOop);
267 }
268 };
269
270 // Should be only used at CDS dump time
271 class VerifyArchivePointerRegionClosure: public HeapRegionClosure {
272 private:
273 G1CollectedHeap* _g1h;
274 public:
275 VerifyArchivePointerRegionClosure(G1CollectedHeap* g1h) { }
276 virtual bool doHeapRegion(HeapRegion* r) {
277 if (r->is_archive()) {
278 VerifyObjectInArchiveRegionClosure verify_oop_pointers(r, false);
279 r->object_iterate(&verify_oop_pointers);
280 }
281 return false;
282 }
283 };
284
285 void G1HeapVerifier::verify_archive_regions() {
286 G1CollectedHeap* g1h = G1CollectedHeap::heap();
287 VerifyArchivePointerRegionClosure cl(NULL);
288 g1h->heap_region_iterate(&cl);
289 }
290
291 class VerifyRegionClosure: public HeapRegionClosure {
292 private:
293 bool _par;
294 VerifyOption _vo;
295 bool _failures;
296 public:
297 // _vo == UsePrevMarking -> use "prev" marking information,
298 // _vo == UseNextMarking -> use "next" marking information,
299 // _vo == UseFullMarking -> use "next" marking bitmap but no TAMS
300 VerifyRegionClosure(bool par, VerifyOption vo)
301 : _par(par),
302 _vo(vo),
303 _failures(false) {}
304
305 bool failures() {
306 return _failures;
307 }
308
309 bool doHeapRegion(HeapRegion* r) {
310 // For archive regions, verify there are no heap pointers to
311 // non-pinned regions. For all others, verify liveness info.
312 if (r->is_closed_archive()) {
313 VerifyObjectInArchiveRegionClosure verify_oop_pointers(r, false);
314 r->object_iterate(&verify_oop_pointers);
315 return true;
316 } else if (r->is_open_archive()) {
317 VerifyObjsInRegionClosure verify_open_archive_oop(r, _vo);
318 r->object_iterate(&verify_open_archive_oop);
319 return true;
320 } else if (!r->is_continues_humongous()) {
321 bool failures = false;
322 r->verify(_vo, &failures);
323 if (failures) {
324 _failures = true;
325 } else if (!r->is_starts_humongous()) {
326 VerifyObjsInRegionClosure not_dead_yet_cl(r, _vo);
327 r->object_iterate(¬_dead_yet_cl);
328 if (_vo != VerifyOption_G1UseNextMarking) {
329 if (r->max_live_bytes() < not_dead_yet_cl.live_bytes()) {
330 log_error(gc, verify)("[" PTR_FORMAT "," PTR_FORMAT "] max_live_bytes " SIZE_FORMAT " < calculated " SIZE_FORMAT,
331 p2i(r->bottom()), p2i(r->end()), r->max_live_bytes(), not_dead_yet_cl.live_bytes());
332 _failures = true;
333 }
334 } else {
335 // When vo == UseNextMarking we cannot currently do a sanity
336 // check on the live bytes as the calculation has not been
337 // finalized yet.
338 }
339 }
340 }
341 return false; // stop the region iteration if we hit a failure
342 }
343 };
344
345 // This is the task used for parallel verification of the heap regions
346
347 class G1ParVerifyTask: public AbstractGangTask {
348 private:
349 G1CollectedHeap* _g1h;
350 VerifyOption _vo;
351 bool _failures;
352 HeapRegionClaimer _hrclaimer;
353
354 public:
355 // _vo == UsePrevMarking -> use "prev" marking information,
356 // _vo == UseNextMarking -> use "next" marking information,
357 // _vo == UseFullMarking -> use "next" marking bitmap but no TAMS
358 G1ParVerifyTask(G1CollectedHeap* g1h, VerifyOption vo) :
359 AbstractGangTask("Parallel verify task"),
360 _g1h(g1h),
361 _vo(vo),
362 _failures(false),
363 _hrclaimer(g1h->workers()->active_workers()) {}
364
365 bool failures() {
366 return _failures;
367 }
368
369 void work(uint worker_id) {
370 HandleMark hm;
371 VerifyRegionClosure blk(true, _vo);
372 _g1h->heap_region_par_iterate_from_worker_offset(&blk, &_hrclaimer, worker_id);
373 if (blk.failures()) {
374 _failures = true;
375 }
376 }
377 };
378
379
380 void G1HeapVerifier::verify(VerifyOption vo) {
381 if (!SafepointSynchronize::is_at_safepoint()) {
382 log_info(gc, verify)("Skipping verification. Not at safepoint.");
383 }
384
385 assert(Thread::current()->is_VM_thread(),
386 "Expected to be executed serially by the VM thread at this point");
387
388 log_debug(gc, verify)("Roots");
389 VerifyRootsClosure rootsCl(vo);
390 VerifyCLDClosure cldCl(_g1h, &rootsCl);
391
392 // We apply the relevant closures to all the oops in the
393 // system dictionary, class loader data graph, the string table
394 // and the nmethods in the code cache.
395 G1VerifyCodeRootOopClosure codeRootsCl(_g1h, &rootsCl, vo);
396 G1VerifyCodeRootBlobClosure blobsCl(&codeRootsCl);
397
398 {
399 G1RootProcessor root_processor(_g1h, 1);
400 root_processor.process_all_roots(&rootsCl,
401 &cldCl,
402 &blobsCl);
403 }
404
405 bool failures = rootsCl.failures() || codeRootsCl.failures();
406
407 if (!_g1h->g1_policy()->collector_state()->full_collection()) {
408 // If we're verifying during a full GC then the region sets
409 // will have been torn down at the start of the GC. Therefore
410 // verifying the region sets will fail. So we only verify
411 // the region sets when not in a full GC.
412 log_debug(gc, verify)("HeapRegionSets");
413 verify_region_sets();
414 }
415
416 log_debug(gc, verify)("HeapRegions");
417 if (GCParallelVerificationEnabled && ParallelGCThreads > 1) {
418
419 G1ParVerifyTask task(_g1h, vo);
420 _g1h->workers()->run_task(&task);
421 if (task.failures()) {
422 failures = true;
423 }
424
425 } else {
426 VerifyRegionClosure blk(false, vo);
427 _g1h->heap_region_iterate(&blk);
428 if (blk.failures()) {
429 failures = true;
430 }
431 }
432
433 if (G1StringDedup::is_enabled()) {
434 log_debug(gc, verify)("StrDedup");
435 G1StringDedup::verify();
436 }
437
438 if (failures) {
439 log_error(gc, verify)("Heap after failed verification:");
440 // It helps to have the per-region information in the output to
441 // help us track down what went wrong. This is why we call
442 // print_extended_on() instead of print_on().
443 Log(gc, verify) log;
444 ResourceMark rm;
445 LogStream ls(log.error());
446 _g1h->print_extended_on(&ls);
447 }
448 guarantee(!failures, "there should not have been any failures");
449 }
450
451 // Heap region set verification
452
453 class VerifyRegionListsClosure : public HeapRegionClosure {
454 private:
455 HeapRegionSet* _old_set;
456 HeapRegionSet* _humongous_set;
457 HeapRegionManager* _hrm;
458
459 public:
460 uint _old_count;
461 uint _humongous_count;
462 uint _free_count;
463
464 VerifyRegionListsClosure(HeapRegionSet* old_set,
465 HeapRegionSet* humongous_set,
466 HeapRegionManager* hrm) :
467 _old_set(old_set), _humongous_set(humongous_set), _hrm(hrm),
468 _old_count(), _humongous_count(), _free_count(){ }
469
470 bool doHeapRegion(HeapRegion* hr) {
471 if (hr->is_young()) {
472 // TODO
473 } else if (hr->is_humongous()) {
474 assert(hr->containing_set() == _humongous_set, "Heap region %u is humongous but not in humongous set.", hr->hrm_index());
475 _humongous_count++;
476 } else if (hr->is_empty()) {
477 assert(_hrm->is_free(hr), "Heap region %u is empty but not on the free list.", hr->hrm_index());
478 _free_count++;
479 } else if (hr->is_old()) {
480 assert(hr->containing_set() == _old_set, "Heap region %u is old but not in the old set.", hr->hrm_index());
481 _old_count++;
482 } else {
483 // There are no other valid region types. Check for one invalid
484 // one we can identify: pinned without old or humongous set.
485 assert(!hr->is_pinned(), "Heap region %u is pinned but not old (archive) or humongous.", hr->hrm_index());
486 ShouldNotReachHere();
487 }
488 return false;
489 }
490
491 void verify_counts(HeapRegionSet* old_set, HeapRegionSet* humongous_set, HeapRegionManager* free_list) {
492 guarantee(old_set->length() == _old_count, "Old set count mismatch. Expected %u, actual %u.", old_set->length(), _old_count);
493 guarantee(humongous_set->length() == _humongous_count, "Hum set count mismatch. Expected %u, actual %u.", humongous_set->length(), _humongous_count);
494 guarantee(free_list->num_free_regions() == _free_count, "Free list count mismatch. Expected %u, actual %u.", free_list->num_free_regions(), _free_count);
495 }
496 };
497
498 void G1HeapVerifier::verify_region_sets() {
499 assert_heap_locked_or_at_safepoint(true /* should_be_vm_thread */);
500
501 // First, check the explicit lists.
502 _g1h->_hrm.verify();
503 {
504 // Given that a concurrent operation might be adding regions to
505 // the secondary free list we have to take the lock before
506 // verifying it.
507 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag);
508 _g1h->_secondary_free_list.verify_list();
509 }
510
511 // If a concurrent region freeing operation is in progress it will
512 // be difficult to correctly attributed any free regions we come
513 // across to the correct free list given that they might belong to
514 // one of several (free_list, secondary_free_list, any local lists,
515 // etc.). So, if that's the case we will skip the rest of the
516 // verification operation. Alternatively, waiting for the concurrent
517 // operation to complete will have a non-trivial effect on the GC's
518 // operation (no concurrent operation will last longer than the
519 // interval between two calls to verification) and it might hide
520 // any issues that we would like to catch during testing.
521 if (_g1h->free_regions_coming()) {
522 return;
523 }
524
525 // Make sure we append the secondary_free_list on the free_list so
526 // that all free regions we will come across can be safely
527 // attributed to the free_list.
528 _g1h->append_secondary_free_list_if_not_empty_with_lock();
529
530 // Finally, make sure that the region accounting in the lists is
531 // consistent with what we see in the heap.
532
533 VerifyRegionListsClosure cl(&_g1h->_old_set, &_g1h->_humongous_set, &_g1h->_hrm);
534 _g1h->heap_region_iterate(&cl);
535 cl.verify_counts(&_g1h->_old_set, &_g1h->_humongous_set, &_g1h->_hrm);
536 }
537
538 void G1HeapVerifier::prepare_for_verify() {
539 if (SafepointSynchronize::is_at_safepoint() || ! UseTLAB) {
540 _g1h->ensure_parsability(false);
541 }
542 }
543
544 double G1HeapVerifier::verify(bool guard, const char* msg) {
545 double verify_time_ms = 0.0;
546
547 if (guard && _g1h->total_collections() >= VerifyGCStartAt) {
548 double verify_start = os::elapsedTime();
549 HandleMark hm; // Discard invalid handles created during verification
550 prepare_for_verify();
551 Universe::verify(VerifyOption_G1UsePrevMarking, msg);
552 verify_time_ms = (os::elapsedTime() - verify_start) * 1000;
553 }
554
555 return verify_time_ms;
556 }
557
558 void G1HeapVerifier::verify_before_gc() {
559 double verify_time_ms = verify(VerifyBeforeGC, "Before GC");
560 _g1h->g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms);
561 }
562
563 void G1HeapVerifier::verify_after_gc() {
564 double verify_time_ms = verify(VerifyAfterGC, "After GC");
565 _g1h->g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms);
566 }
567
568
569 #ifndef PRODUCT
570 class G1VerifyCardTableCleanup: public HeapRegionClosure {
571 G1HeapVerifier* _verifier;
572 G1SATBCardTableModRefBS* _ct_bs;
573 public:
574 G1VerifyCardTableCleanup(G1HeapVerifier* verifier, G1SATBCardTableModRefBS* ct_bs)
575 : _verifier(verifier), _ct_bs(ct_bs) { }
576 virtual bool doHeapRegion(HeapRegion* r) {
577 if (r->is_survivor()) {
578 _verifier->verify_dirty_region(r);
579 } else {
580 _verifier->verify_not_dirty_region(r);
581 }
582 return false;
583 }
584 };
585
586 void G1HeapVerifier::verify_card_table_cleanup() {
587 if (G1VerifyCTCleanup || VerifyAfterGC) {
588 G1VerifyCardTableCleanup cleanup_verifier(this, _g1h->g1_barrier_set());
589 _g1h->heap_region_iterate(&cleanup_verifier);
590 }
591 }
592
593 void G1HeapVerifier::verify_not_dirty_region(HeapRegion* hr) {
594 // All of the region should be clean.
595 G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
596 MemRegion mr(hr->bottom(), hr->end());
597 ct_bs->verify_not_dirty_region(mr);
598 }
599
600 void G1HeapVerifier::verify_dirty_region(HeapRegion* hr) {
601 // We cannot guarantee that [bottom(),end()] is dirty. Threads
602 // dirty allocated blocks as they allocate them. The thread that
603 // retires each region and replaces it with a new one will do a
604 // maximal allocation to fill in [pre_dummy_top(),end()] but will
605 // not dirty that area (one less thing to have to do while holding
606 // a lock). So we can only verify that [bottom(),pre_dummy_top()]
607 // is dirty.
608 G1SATBCardTableModRefBS* ct_bs = _g1h->g1_barrier_set();
609 MemRegion mr(hr->bottom(), hr->pre_dummy_top());
610 if (hr->is_young()) {
611 ct_bs->verify_g1_young_region(mr);
612 } else {
613 ct_bs->verify_dirty_region(mr);
614 }
615 }
616
617 class G1VerifyDirtyYoungListClosure : public HeapRegionClosure {
618 private:
619 G1HeapVerifier* _verifier;
620 public:
621 G1VerifyDirtyYoungListClosure(G1HeapVerifier* verifier) : HeapRegionClosure(), _verifier(verifier) { }
622 virtual bool doHeapRegion(HeapRegion* r) {
623 _verifier->verify_dirty_region(r);
624 return false;
625 }
626 };
627
628 void G1HeapVerifier::verify_dirty_young_regions() {
629 G1VerifyDirtyYoungListClosure cl(this);
630 _g1h->collection_set()->iterate(&cl);
631 }
632
633 bool G1HeapVerifier::verify_no_bits_over_tams(const char* bitmap_name, const G1CMBitMap* const bitmap,
634 HeapWord* tams, HeapWord* end) {
635 guarantee(tams <= end,
636 "tams: " PTR_FORMAT " end: " PTR_FORMAT, p2i(tams), p2i(end));
637 HeapWord* result = bitmap->get_next_marked_addr(tams, end);
638 if (result < end) {
639 log_error(gc, verify)("## wrong marked address on %s bitmap: " PTR_FORMAT, bitmap_name, p2i(result));
640 log_error(gc, verify)("## %s tams: " PTR_FORMAT " end: " PTR_FORMAT, bitmap_name, p2i(tams), p2i(end));
641 return false;
642 }
643 return true;
644 }
645
646 bool G1HeapVerifier::verify_bitmaps(const char* caller, HeapRegion* hr) {
647 const G1CMBitMap* const prev_bitmap = _g1h->concurrent_mark()->prev_mark_bitmap();
648 const G1CMBitMap* const next_bitmap = _g1h->concurrent_mark()->next_mark_bitmap();
649
650 HeapWord* ptams = hr->prev_top_at_mark_start();
651 HeapWord* ntams = hr->next_top_at_mark_start();
652 HeapWord* end = hr->end();
653
654 bool res_p = verify_no_bits_over_tams("prev", prev_bitmap, ptams, end);
655
656 bool res_n = true;
657 // We reset mark_in_progress() before we reset _cmThread->in_progress() and in this window
658 // we do the clearing of the next bitmap concurrently. Thus, we can not verify the bitmap
659 // if we happen to be in that state.
660 if (_g1h->collector_state()->mark_in_progress() || !_g1h->_cmThread->in_progress()) {
661 res_n = verify_no_bits_over_tams("next", next_bitmap, ntams, end);
662 }
663 if (!res_p || !res_n) {
664 log_error(gc, verify)("#### Bitmap verification failed for " HR_FORMAT, HR_FORMAT_PARAMS(hr));
665 log_error(gc, verify)("#### Caller: %s", caller);
666 return false;
667 }
668 return true;
669 }
670
671 void G1HeapVerifier::check_bitmaps(const char* caller, HeapRegion* hr) {
672 if (!G1VerifyBitmaps) return;
673
674 guarantee(verify_bitmaps(caller, hr), "bitmap verification");
675 }
676
677 class G1VerifyBitmapClosure : public HeapRegionClosure {
678 private:
679 const char* _caller;
680 G1HeapVerifier* _verifier;
681 bool _failures;
682
683 public:
684 G1VerifyBitmapClosure(const char* caller, G1HeapVerifier* verifier) :
685 _caller(caller), _verifier(verifier), _failures(false) { }
686
687 bool failures() { return _failures; }
688
689 virtual bool doHeapRegion(HeapRegion* hr) {
690 bool result = _verifier->verify_bitmaps(_caller, hr);
691 if (!result) {
692 _failures = true;
693 }
694 return false;
695 }
696 };
697
698 void G1HeapVerifier::check_bitmaps(const char* caller) {
699 if (!G1VerifyBitmaps) return;
700
701 G1VerifyBitmapClosure cl(caller, this);
702 _g1h->heap_region_iterate(&cl);
703 guarantee(!cl.failures(), "bitmap verification");
704 }
705
706 class G1CheckCSetFastTableClosure : public HeapRegionClosure {
707 private:
708 bool _failures;
709 public:
710 G1CheckCSetFastTableClosure() : HeapRegionClosure(), _failures(false) { }
711
712 virtual bool doHeapRegion(HeapRegion* hr) {
713 uint i = hr->hrm_index();
714 InCSetState cset_state = (InCSetState) G1CollectedHeap::heap()->_in_cset_fast_test.get_by_index(i);
715 if (hr->is_humongous()) {
716 if (hr->in_collection_set()) {
717 log_error(gc, verify)("## humongous region %u in CSet", i);
718 _failures = true;
719 return true;
720 }
721 if (cset_state.is_in_cset()) {
722 log_error(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for humongous region %u", cset_state.value(), i);
723 _failures = true;
724 return true;
725 }
726 if (hr->is_continues_humongous() && cset_state.is_humongous()) {
727 log_error(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for continues humongous region %u", cset_state.value(), i);
728 _failures = true;
729 return true;
730 }
731 } else {
732 if (cset_state.is_humongous()) {
733 log_error(gc, verify)("## inconsistent cset state " CSETSTATE_FORMAT " for non-humongous region %u", cset_state.value(), i);
734 _failures = true;
735 return true;
736 }
737 if (hr->in_collection_set() != cset_state.is_in_cset()) {
738 log_error(gc, verify)("## in CSet %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
739 hr->in_collection_set(), cset_state.value(), i);
740 _failures = true;
741 return true;
742 }
743 if (cset_state.is_in_cset()) {
744 if (hr->is_young() != (cset_state.is_young())) {
745 log_error(gc, verify)("## is_young %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
746 hr->is_young(), cset_state.value(), i);
747 _failures = true;
748 return true;
749 }
750 if (hr->is_old() != (cset_state.is_old())) {
751 log_error(gc, verify)("## is_old %d / cset state " CSETSTATE_FORMAT " inconsistency for region %u",
752 hr->is_old(), cset_state.value(), i);
753 _failures = true;
754 return true;
755 }
756 }
757 }
758 return false;
759 }
760
761 bool failures() const { return _failures; }
762 };
763
764 bool G1HeapVerifier::check_cset_fast_test() {
765 G1CheckCSetFastTableClosure cl;
766 _g1h->_hrm.iterate(&cl);
767 return !cl.failures();
768 }
769 #endif // PRODUCT