Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.cpp @ 751:20c6f43950b5
6490395: G1: Tidy up command line flags.
Summary: Change G1 flag names to be more consistent and disable some in 'product' mode.
Reviewed-by: tonyp, iveresov
author | johnc |
---|---|
date | Thu, 30 Apr 2009 15:07:53 -0700 |
parents | 2b6c55e36143 |
children | 29e7d79232b9 |
rev | line source |
---|---|
342 | 1 /* |
470 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_heapRegion.cpp.incl" | |
27 | |
28 HeapRegionDCTOC::HeapRegionDCTOC(G1CollectedHeap* g1, | |
29 HeapRegion* hr, OopClosure* cl, | |
30 CardTableModRefBS::PrecisionStyle precision, | |
31 FilterKind fk) : | |
32 ContiguousSpaceDCTOC(hr, cl, precision, NULL), | |
33 _hr(hr), _fk(fk), _g1(g1) | |
34 {} | |
35 | |
36 FilterOutOfRegionClosure::FilterOutOfRegionClosure(HeapRegion* r, | |
37 OopClosure* oc) : | |
38 _r_bottom(r->bottom()), _r_end(r->end()), | |
39 _oc(oc), _out_of_region(0) | |
40 {} | |
41 | |
42 class VerifyLiveClosure: public OopClosure { | |
43 G1CollectedHeap* _g1h; | |
44 CardTableModRefBS* _bs; | |
45 oop _containing_obj; | |
46 bool _failures; | |
47 int _n_failures; | |
48 public: | |
49 VerifyLiveClosure(G1CollectedHeap* g1h) : | |
50 _g1h(g1h), _bs(NULL), _containing_obj(NULL), | |
51 _failures(false), _n_failures(0) | |
52 { | |
53 BarrierSet* bs = _g1h->barrier_set(); | |
54 if (bs->is_a(BarrierSet::CardTableModRef)) | |
55 _bs = (CardTableModRefBS*)bs; | |
56 } | |
57 | |
58 void set_containing_obj(oop obj) { | |
59 _containing_obj = obj; | |
60 } | |
61 | |
62 bool failures() { return _failures; } | |
63 int n_failures() { return _n_failures; } | |
64 | |
65 virtual void do_oop(narrowOop* p) { | |
66 guarantee(false, "NYI"); | |
67 } | |
68 | |
69 void do_oop(oop* p) { | |
70 assert(_containing_obj != NULL, "Precondition"); | |
71 assert(!_g1h->is_obj_dead(_containing_obj), "Precondition"); | |
72 oop obj = *p; | |
73 if (obj != NULL) { | |
74 bool failed = false; | |
75 if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead(obj)) { | |
76 if (!_failures) { | |
77 gclog_or_tty->print_cr(""); | |
78 gclog_or_tty->print_cr("----------"); | |
79 } | |
80 if (!_g1h->is_in_closed_subset(obj)) { | |
81 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
82 " of live obj "PTR_FORMAT | |
83 " points to obj "PTR_FORMAT | |
84 " not in the heap.", | |
85 p, (void*) _containing_obj, (void*) obj); | |
86 } else { | |
87 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
88 " of live obj "PTR_FORMAT | |
89 " points to dead obj "PTR_FORMAT".", | |
90 p, (void*) _containing_obj, (void*) obj); | |
91 } | |
92 gclog_or_tty->print_cr("Live obj:"); | |
93 _containing_obj->print_on(gclog_or_tty); | |
94 gclog_or_tty->print_cr("Bad referent:"); | |
95 obj->print_on(gclog_or_tty); | |
96 gclog_or_tty->print_cr("----------"); | |
97 _failures = true; | |
98 failed = true; | |
99 _n_failures++; | |
100 } | |
101 | |
102 if (!_g1h->full_collection()) { | |
103 HeapRegion* from = _g1h->heap_region_containing(p); | |
104 HeapRegion* to = _g1h->heap_region_containing(*p); | |
105 if (from != NULL && to != NULL && | |
106 from != to && | |
107 !to->isHumongous()) { | |
108 jbyte cv_obj = *_bs->byte_for_const(_containing_obj); | |
109 jbyte cv_field = *_bs->byte_for_const(p); | |
110 const jbyte dirty = CardTableModRefBS::dirty_card_val(); | |
111 | |
112 bool is_bad = !(from->is_young() | |
113 || to->rem_set()->contains_reference(p) | |
114 || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed | |
115 (_containing_obj->is_objArray() ? | |
116 cv_field == dirty | |
117 : cv_obj == dirty || cv_field == dirty)); | |
118 if (is_bad) { | |
119 if (!_failures) { | |
120 gclog_or_tty->print_cr(""); | |
121 gclog_or_tty->print_cr("----------"); | |
122 } | |
123 gclog_or_tty->print_cr("Missing rem set entry:"); | |
124 gclog_or_tty->print_cr("Field "PTR_FORMAT | |
125 " of obj "PTR_FORMAT | |
126 ", in region %d ["PTR_FORMAT | |
127 ", "PTR_FORMAT"),", | |
128 p, (void*) _containing_obj, | |
129 from->hrs_index(), | |
130 from->bottom(), | |
131 from->end()); | |
132 _containing_obj->print_on(gclog_or_tty); | |
133 gclog_or_tty->print_cr("points to obj "PTR_FORMAT | |
134 " in region %d ["PTR_FORMAT | |
135 ", "PTR_FORMAT").", | |
136 (void*) obj, to->hrs_index(), | |
137 to->bottom(), to->end()); | |
138 obj->print_on(gclog_or_tty); | |
139 gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", | |
140 cv_obj, cv_field); | |
141 gclog_or_tty->print_cr("----------"); | |
142 _failures = true; | |
143 if (!failed) _n_failures++; | |
144 } | |
145 } | |
146 } | |
147 } | |
148 } | |
149 }; | |
150 | |
151 template<class ClosureType> | |
152 HeapWord* walk_mem_region_loop(ClosureType* cl, G1CollectedHeap* g1h, | |
153 HeapRegion* hr, | |
154 HeapWord* cur, HeapWord* top) { | |
155 oop cur_oop = oop(cur); | |
156 int oop_size = cur_oop->size(); | |
157 HeapWord* next_obj = cur + oop_size; | |
158 while (next_obj < top) { | |
159 // Keep filtering the remembered set. | |
160 if (!g1h->is_obj_dead(cur_oop, hr)) { | |
161 // Bottom lies entirely below top, so we can call the | |
162 // non-memRegion version of oop_iterate below. | |
163 cur_oop->oop_iterate(cl); | |
164 } | |
165 cur = next_obj; | |
166 cur_oop = oop(cur); | |
167 oop_size = cur_oop->size(); | |
168 next_obj = cur + oop_size; | |
169 } | |
170 return cur; | |
171 } | |
172 | |
173 void HeapRegionDCTOC::walk_mem_region_with_cl(MemRegion mr, | |
174 HeapWord* bottom, | |
175 HeapWord* top, | |
176 OopClosure* cl) { | |
177 G1CollectedHeap* g1h = _g1; | |
178 | |
179 int oop_size; | |
180 | |
181 OopClosure* cl2 = cl; | |
182 FilterIntoCSClosure intoCSFilt(this, g1h, cl); | |
183 FilterOutOfRegionClosure outOfRegionFilt(_hr, cl); | |
184 switch (_fk) { | |
185 case IntoCSFilterKind: cl2 = &intoCSFilt; break; | |
186 case OutOfRegionFilterKind: cl2 = &outOfRegionFilt; break; | |
187 } | |
188 | |
189 // Start filtering what we add to the remembered set. If the object is | |
190 // not considered dead, either because it is marked (in the mark bitmap) | |
191 // or it was allocated after marking finished, then we add it. Otherwise | |
192 // we can safely ignore the object. | |
193 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
194 oop_size = oop(bottom)->oop_iterate(cl2, mr); | |
195 } else { | |
196 oop_size = oop(bottom)->size(); | |
197 } | |
198 | |
199 bottom += oop_size; | |
200 | |
201 if (bottom < top) { | |
202 // We replicate the loop below for several kinds of possible filters. | |
203 switch (_fk) { | |
204 case NoFilterKind: | |
205 bottom = walk_mem_region_loop(cl, g1h, _hr, bottom, top); | |
206 break; | |
207 case IntoCSFilterKind: { | |
208 FilterIntoCSClosure filt(this, g1h, cl); | |
209 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
210 break; | |
211 } | |
212 case OutOfRegionFilterKind: { | |
213 FilterOutOfRegionClosure filt(_hr, cl); | |
214 bottom = walk_mem_region_loop(&filt, g1h, _hr, bottom, top); | |
215 break; | |
216 } | |
217 default: | |
218 ShouldNotReachHere(); | |
219 } | |
220 | |
221 // Last object. Need to do dead-obj filtering here too. | |
222 if (!g1h->is_obj_dead(oop(bottom), _hr)) { | |
223 oop(bottom)->oop_iterate(cl2, mr); | |
224 } | |
225 } | |
226 } | |
227 | |
228 void HeapRegion::reset_after_compaction() { | |
229 G1OffsetTableContigSpace::reset_after_compaction(); | |
230 // After a compaction the mark bitmap is invalid, so we must | |
231 // treat all objects as being inside the unmarked area. | |
232 zero_marked_bytes(); | |
233 init_top_at_mark_start(); | |
234 } | |
235 | |
236 DirtyCardToOopClosure* | |
237 HeapRegion::new_dcto_closure(OopClosure* cl, | |
238 CardTableModRefBS::PrecisionStyle precision, | |
239 HeapRegionDCTOC::FilterKind fk) { | |
240 return new HeapRegionDCTOC(G1CollectedHeap::heap(), | |
241 this, cl, precision, fk); | |
242 } | |
243 | |
244 void HeapRegion::hr_clear(bool par, bool clear_space) { | |
355 | 245 _humongous_type = NotHumongous; |
342 | 246 _humongous_start_region = NULL; |
247 _in_collection_set = false; | |
248 _is_gc_alloc_region = false; | |
249 | |
250 // Age stuff (if parallel, this will be done separately, since it needs | |
251 // to be sequential). | |
252 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
253 | |
254 set_young_index_in_cset(-1); | |
255 uninstall_surv_rate_group(); | |
256 set_young_type(NotYoung); | |
257 | |
258 // In case it had been the start of a humongous sequence, reset its end. | |
259 set_end(_orig_end); | |
260 | |
261 if (!par) { | |
262 // If this is parallel, this will be done later. | |
263 HeapRegionRemSet* hrrs = rem_set(); | |
264 if (hrrs != NULL) hrrs->clear(); | |
355 | 265 _claimed = InitialClaimValue; |
342 | 266 } |
267 zero_marked_bytes(); | |
268 set_sort_index(-1); | |
269 | |
270 _offsets.resize(HeapRegion::GrainWords); | |
271 init_top_at_mark_start(); | |
356 | 272 if (clear_space) clear(SpaceDecorator::Mangle); |
342 | 273 } |
274 | |
275 // <PREDICTION> | |
276 void HeapRegion::calc_gc_efficiency() { | |
277 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
278 _gc_efficiency = (double) garbage_bytes() / | |
279 g1h->predict_region_elapsed_time_ms(this, false); | |
280 } | |
281 // </PREDICTION> | |
282 | |
283 void HeapRegion::set_startsHumongous() { | |
355 | 284 _humongous_type = StartsHumongous; |
342 | 285 _humongous_start_region = this; |
286 assert(end() == _orig_end, "Should be normal before alloc."); | |
287 } | |
288 | |
289 bool HeapRegion::claimHeapRegion(jint claimValue) { | |
290 jint current = _claimed; | |
291 if (current != claimValue) { | |
292 jint res = Atomic::cmpxchg(claimValue, &_claimed, current); | |
293 if (res == current) { | |
294 return true; | |
295 } | |
296 } | |
297 return false; | |
298 } | |
299 | |
300 HeapWord* HeapRegion::next_block_start_careful(HeapWord* addr) { | |
301 HeapWord* low = addr; | |
302 HeapWord* high = end(); | |
303 while (low < high) { | |
304 size_t diff = pointer_delta(high, low); | |
305 // Must add one below to bias toward the high amount. Otherwise, if | |
306 // "high" were at the desired value, and "low" were one less, we | |
307 // would not converge on "high". This is not symmetric, because | |
308 // we set "high" to a block start, which might be the right one, | |
309 // which we don't do for "low". | |
310 HeapWord* middle = low + (diff+1)/2; | |
311 if (middle == high) return high; | |
312 HeapWord* mid_bs = block_start_careful(middle); | |
313 if (mid_bs < addr) { | |
314 low = middle; | |
315 } else { | |
316 high = mid_bs; | |
317 } | |
318 } | |
319 assert(low == high && low >= addr, "Didn't work."); | |
320 return low; | |
321 } | |
322 | |
323 void HeapRegion::set_next_on_unclean_list(HeapRegion* r) { | |
324 assert(r == NULL || r->is_on_unclean_list(), "Malformed unclean list."); | |
325 _next_in_special_set = r; | |
326 } | |
327 | |
328 void HeapRegion::set_on_unclean_list(bool b) { | |
329 _is_on_unclean_list = b; | |
330 } | |
331 | |
356 | 332 void HeapRegion::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
333 G1OffsetTableContigSpace::initialize(mr, false, mangle_space); | |
342 | 334 hr_clear(false/*par*/, clear_space); |
335 } | |
336 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away | |
337 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
338 #endif // _MSC_VER | |
339 | |
340 | |
341 HeapRegion:: | |
342 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
343 MemRegion mr, bool is_zeroed) | |
344 : G1OffsetTableContigSpace(sharedOffsetArray, mr, is_zeroed), | |
345 _next_fk(HeapRegionDCTOC::NoFilterKind), | |
346 _hrs_index(-1), | |
355 | 347 _humongous_type(NotHumongous), _humongous_start_region(NULL), |
342 | 348 _in_collection_set(false), _is_gc_alloc_region(false), |
349 _is_on_free_list(false), _is_on_unclean_list(false), | |
350 _next_in_special_set(NULL), _orig_end(NULL), | |
355 | 351 _claimed(InitialClaimValue), _evacuation_failed(false), |
342 | 352 _prev_marked_bytes(0), _next_marked_bytes(0), _sort_index(-1), |
353 _young_type(NotYoung), _next_young_region(NULL), | |
354 _young_index_in_cset(-1), _surv_rate_group(NULL), _age_index(-1), | |
355 _rem_set(NULL), _zfs(NotZeroFilled) | |
356 { | |
357 _orig_end = mr.end(); | |
358 // Note that initialize() will set the start of the unmarked area of the | |
359 // region. | |
356 | 360 this->initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
361 set_top(bottom()); | |
362 set_saved_mark(); | |
342 | 363 |
364 _rem_set = new HeapRegionRemSet(sharedOffsetArray, this); | |
365 | |
366 assert(HeapRegionRemSet::num_par_rem_sets() > 0, "Invariant."); | |
367 // In case the region is allocated during a pause, note the top. | |
368 // We haven't done any counting on a brand new region. | |
369 _top_at_conc_mark_count = bottom(); | |
370 } | |
371 | |
372 class NextCompactionHeapRegionClosure: public HeapRegionClosure { | |
373 const HeapRegion* _target; | |
374 bool _target_seen; | |
375 HeapRegion* _last; | |
376 CompactibleSpace* _res; | |
377 public: | |
378 NextCompactionHeapRegionClosure(const HeapRegion* target) : | |
379 _target(target), _target_seen(false), _res(NULL) {} | |
380 bool doHeapRegion(HeapRegion* cur) { | |
381 if (_target_seen) { | |
382 if (!cur->isHumongous()) { | |
383 _res = cur; | |
384 return true; | |
385 } | |
386 } else if (cur == _target) { | |
387 _target_seen = true; | |
388 } | |
389 return false; | |
390 } | |
391 CompactibleSpace* result() { return _res; } | |
392 }; | |
393 | |
394 CompactibleSpace* HeapRegion::next_compaction_space() const { | |
395 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
396 // cast away const-ness | |
397 HeapRegion* r = (HeapRegion*) this; | |
398 NextCompactionHeapRegionClosure blk(r); | |
399 g1h->heap_region_iterate_from(r, &blk); | |
400 return blk.result(); | |
401 } | |
402 | |
403 void HeapRegion::set_continuesHumongous(HeapRegion* start) { | |
404 // The order is important here. | |
405 start->add_continuingHumongousRegion(this); | |
355 | 406 _humongous_type = ContinuesHumongous; |
342 | 407 _humongous_start_region = start; |
408 } | |
409 | |
410 void HeapRegion::add_continuingHumongousRegion(HeapRegion* cont) { | |
411 // Must join the blocks of the current H region seq with the block of the | |
412 // added region. | |
413 offsets()->join_blocks(bottom(), cont->bottom()); | |
414 arrayOop obj = (arrayOop)(bottom()); | |
415 obj->set_length((int) (obj->length() + cont->capacity()/jintSize)); | |
416 set_end(cont->end()); | |
417 set_top(cont->end()); | |
418 } | |
419 | |
420 void HeapRegion::save_marks() { | |
421 set_saved_mark(); | |
422 } | |
423 | |
424 void HeapRegion::oops_in_mr_iterate(MemRegion mr, OopClosure* cl) { | |
425 HeapWord* p = mr.start(); | |
426 HeapWord* e = mr.end(); | |
427 oop obj; | |
428 while (p < e) { | |
429 obj = oop(p); | |
430 p += obj->oop_iterate(cl); | |
431 } | |
432 assert(p == e, "bad memregion: doesn't end on obj boundary"); | |
433 } | |
434 | |
435 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN(OopClosureType, nv_suffix) \ | |
436 void HeapRegion::oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl) { \ | |
437 ContiguousSpace::oop_since_save_marks_iterate##nv_suffix(cl); \ | |
438 } | |
439 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DEFN) | |
440 | |
441 | |
442 void HeapRegion::oop_before_save_marks_iterate(OopClosure* cl) { | |
443 oops_in_mr_iterate(MemRegion(bottom(), saved_mark_word()), cl); | |
444 } | |
445 | |
446 #ifdef DEBUG | |
447 HeapWord* HeapRegion::allocate(size_t size) { | |
448 jint state = zero_fill_state(); | |
449 assert(!G1CollectedHeap::heap()->allocs_are_zero_filled() || | |
450 zero_fill_is_allocated(), | |
451 "When ZF is on, only alloc in ZF'd regions"); | |
452 return G1OffsetTableContigSpace::allocate(size); | |
453 } | |
454 #endif | |
455 | |
456 void HeapRegion::set_zero_fill_state_work(ZeroFillState zfs) { | |
457 assert(top() == bottom() || zfs == Allocated, | |
458 "Region must be empty, or we must be setting it to allocated."); | |
459 assert(ZF_mon->owned_by_self() || | |
460 Universe::heap()->is_gc_active(), | |
461 "Must hold the lock or be a full GC to modify."); | |
462 _zfs = zfs; | |
463 } | |
464 | |
465 void HeapRegion::set_zero_fill_complete() { | |
466 set_zero_fill_state_work(ZeroFilled); | |
467 if (ZF_mon->owned_by_self()) { | |
468 ZF_mon->notify_all(); | |
469 } | |
470 } | |
471 | |
472 | |
473 void HeapRegion::ensure_zero_filled() { | |
474 MutexLockerEx x(ZF_mon, Mutex::_no_safepoint_check_flag); | |
475 ensure_zero_filled_locked(); | |
476 } | |
477 | |
478 void HeapRegion::ensure_zero_filled_locked() { | |
479 assert(ZF_mon->owned_by_self(), "Precondition"); | |
480 bool should_ignore_zf = SafepointSynchronize::is_at_safepoint(); | |
481 assert(should_ignore_zf || Heap_lock->is_locked(), | |
482 "Either we're in a GC or we're allocating a region."); | |
483 switch (zero_fill_state()) { | |
484 case HeapRegion::NotZeroFilled: | |
485 set_zero_fill_in_progress(Thread::current()); | |
486 { | |
487 ZF_mon->unlock(); | |
488 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
489 ZF_mon->lock_without_safepoint_check(); | |
490 } | |
491 // A trap. | |
492 guarantee(zero_fill_state() == HeapRegion::ZeroFilling | |
493 && zero_filler() == Thread::current(), | |
494 "AHA! Tell Dave D if you see this..."); | |
495 set_zero_fill_complete(); | |
496 // gclog_or_tty->print_cr("Did sync ZF."); | |
497 ConcurrentZFThread::note_sync_zfs(); | |
498 break; | |
499 case HeapRegion::ZeroFilling: | |
500 if (should_ignore_zf) { | |
501 // We can "break" the lock and take over the work. | |
502 Copy::fill_to_words(bottom(), capacity()/HeapWordSize); | |
503 set_zero_fill_complete(); | |
504 ConcurrentZFThread::note_sync_zfs(); | |
505 break; | |
506 } else { | |
507 ConcurrentZFThread::wait_for_ZF_completed(this); | |
508 } | |
509 case HeapRegion::ZeroFilled: | |
510 // Nothing to do. | |
511 break; | |
512 case HeapRegion::Allocated: | |
513 guarantee(false, "Should not call on allocated regions."); | |
514 } | |
515 assert(zero_fill_state() == HeapRegion::ZeroFilled, "Post"); | |
516 } | |
517 | |
518 HeapWord* | |
519 HeapRegion::object_iterate_mem_careful(MemRegion mr, | |
520 ObjectClosure* cl) { | |
521 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
522 // We used to use "block_start_careful" here. But we're actually happy | |
523 // to update the BOT while we do this... | |
524 HeapWord* cur = block_start(mr.start()); | |
525 mr = mr.intersection(used_region()); | |
526 if (mr.is_empty()) return NULL; | |
527 // Otherwise, find the obj that extends onto mr.start(). | |
528 | |
529 assert(cur <= mr.start() | |
530 && (oop(cur)->klass() == NULL || | |
531 cur + oop(cur)->size() > mr.start()), | |
532 "postcondition of block_start"); | |
533 oop obj; | |
534 while (cur < mr.end()) { | |
535 obj = oop(cur); | |
536 if (obj->klass() == NULL) { | |
537 // Ran into an unparseable point. | |
538 return cur; | |
539 } else if (!g1h->is_obj_dead(obj)) { | |
540 cl->do_object(obj); | |
541 } | |
542 if (cl->abort()) return cur; | |
543 // The check above must occur before the operation below, since an | |
544 // abort might invalidate the "size" operation. | |
545 cur += obj->size(); | |
546 } | |
547 return NULL; | |
548 } | |
549 | |
550 HeapWord* | |
551 HeapRegion:: | |
552 oops_on_card_seq_iterate_careful(MemRegion mr, | |
553 FilterOutOfRegionClosure* cl) { | |
554 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
555 | |
556 // If we're within a stop-world GC, then we might look at a card in a | |
557 // GC alloc region that extends onto a GC LAB, which may not be | |
558 // parseable. Stop such at the "saved_mark" of the region. | |
559 if (G1CollectedHeap::heap()->is_gc_active()) { | |
560 mr = mr.intersection(used_region_at_save_marks()); | |
561 } else { | |
562 mr = mr.intersection(used_region()); | |
563 } | |
564 if (mr.is_empty()) return NULL; | |
565 // Otherwise, find the obj that extends onto mr.start(). | |
566 | |
567 // We used to use "block_start_careful" here. But we're actually happy | |
568 // to update the BOT while we do this... | |
569 HeapWord* cur = block_start(mr.start()); | |
570 assert(cur <= mr.start(), "Postcondition"); | |
571 | |
572 while (cur <= mr.start()) { | |
573 if (oop(cur)->klass() == NULL) { | |
574 // Ran into an unparseable point. | |
575 return cur; | |
576 } | |
577 // Otherwise... | |
578 int sz = oop(cur)->size(); | |
579 if (cur + sz > mr.start()) break; | |
580 // Otherwise, go on. | |
581 cur = cur + sz; | |
582 } | |
583 oop obj; | |
584 obj = oop(cur); | |
585 // If we finish this loop... | |
586 assert(cur <= mr.start() | |
587 && obj->klass() != NULL | |
588 && cur + obj->size() > mr.start(), | |
589 "Loop postcondition"); | |
590 if (!g1h->is_obj_dead(obj)) { | |
591 obj->oop_iterate(cl, mr); | |
592 } | |
593 | |
594 HeapWord* next; | |
595 while (cur < mr.end()) { | |
596 obj = oop(cur); | |
597 if (obj->klass() == NULL) { | |
598 // Ran into an unparseable point. | |
599 return cur; | |
600 }; | |
601 // Otherwise: | |
602 next = (cur + obj->size()); | |
603 if (!g1h->is_obj_dead(obj)) { | |
604 if (next < mr.end()) { | |
605 obj->oop_iterate(cl); | |
606 } else { | |
607 // this obj spans the boundary. If it's an array, stop at the | |
608 // boundary. | |
609 if (obj->is_objArray()) { | |
610 obj->oop_iterate(cl, mr); | |
611 } else { | |
612 obj->oop_iterate(cl); | |
613 } | |
614 } | |
615 } | |
616 cur = next; | |
617 } | |
618 return NULL; | |
619 } | |
620 | |
621 void HeapRegion::print() const { print_on(gclog_or_tty); } | |
622 void HeapRegion::print_on(outputStream* st) const { | |
623 if (isHumongous()) { | |
624 if (startsHumongous()) | |
625 st->print(" HS"); | |
626 else | |
627 st->print(" HC"); | |
628 } else { | |
629 st->print(" "); | |
630 } | |
631 if (in_collection_set()) | |
632 st->print(" CS"); | |
633 else if (is_gc_alloc_region()) | |
634 st->print(" A "); | |
635 else | |
636 st->print(" "); | |
637 if (is_young()) | |
638 st->print(is_scan_only() ? " SO" : (is_survivor() ? " SU" : " Y ")); | |
639 else | |
640 st->print(" "); | |
641 if (is_empty()) | |
642 st->print(" F"); | |
643 else | |
644 st->print(" "); | |
645 st->print(" %d", _gc_time_stamp); | |
646 G1OffsetTableContigSpace::print_on(st); | |
647 } | |
648 | |
649 #define OBJ_SAMPLE_INTERVAL 0 | |
650 #define BLOCK_SAMPLE_INTERVAL 100 | |
651 | |
652 // This really ought to be commoned up into OffsetTableContigSpace somehow. | |
653 // We would need a mechanism to make that code skip dead objects. | |
654 | |
655 void HeapRegion::verify(bool allow_dirty) const { | |
656 G1CollectedHeap* g1 = G1CollectedHeap::heap(); | |
657 HeapWord* p = bottom(); | |
658 HeapWord* prev_p = NULL; | |
659 int objs = 0; | |
660 int blocks = 0; | |
661 VerifyLiveClosure vl_cl(g1); | |
662 while (p < top()) { | |
663 size_t size = oop(p)->size(); | |
664 if (blocks == BLOCK_SAMPLE_INTERVAL) { | |
665 guarantee(p == block_start_const(p + (size/2)), | |
666 "check offset computation"); | |
667 blocks = 0; | |
668 } else { | |
669 blocks++; | |
670 } | |
671 if (objs == OBJ_SAMPLE_INTERVAL) { | |
672 oop obj = oop(p); | |
673 if (!g1->is_obj_dead(obj, this)) { | |
674 obj->verify(); | |
675 vl_cl.set_containing_obj(obj); | |
676 obj->oop_iterate(&vl_cl); | |
677 if (G1MaxVerifyFailures >= 0 | |
678 && vl_cl.n_failures() >= G1MaxVerifyFailures) break; | |
679 } | |
680 objs = 0; | |
681 } else { | |
682 objs++; | |
683 } | |
684 prev_p = p; | |
685 p += size; | |
686 } | |
687 HeapWord* rend = end(); | |
688 HeapWord* rtop = top(); | |
689 if (rtop < rend) { | |
690 guarantee(block_start_const(rtop + (rend - rtop) / 2) == rtop, | |
691 "check offset computation"); | |
692 } | |
693 if (vl_cl.failures()) { | |
694 gclog_or_tty->print_cr("Heap:"); | |
695 G1CollectedHeap::heap()->print(); | |
696 gclog_or_tty->print_cr(""); | |
697 } | |
751 | 698 if (VerifyDuringGC && |
342 | 699 G1VerifyConcMarkPrintReachable && |
700 vl_cl.failures()) { | |
701 g1->concurrent_mark()->print_prev_bitmap_reachable(); | |
702 } | |
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703 guarantee(!vl_cl.failures(), "region verification failed"); |
342 | 704 guarantee(p == top(), "end of last object must match end of space"); |
705 } | |
706 | |
707 // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go | |
708 // away eventually. | |
709 | |
356 | 710 void G1OffsetTableContigSpace::initialize(MemRegion mr, bool clear_space, bool mangle_space) { |
342 | 711 // false ==> we'll do the clearing if there's clearing to be done. |
356 | 712 ContiguousSpace::initialize(mr, false, mangle_space); |
342 | 713 _offsets.zero_bottom_entry(); |
714 _offsets.initialize_threshold(); | |
356 | 715 if (clear_space) clear(mangle_space); |
342 | 716 } |
717 | |
356 | 718 void G1OffsetTableContigSpace::clear(bool mangle_space) { |
719 ContiguousSpace::clear(mangle_space); | |
342 | 720 _offsets.zero_bottom_entry(); |
721 _offsets.initialize_threshold(); | |
722 } | |
723 | |
724 void G1OffsetTableContigSpace::set_bottom(HeapWord* new_bottom) { | |
725 Space::set_bottom(new_bottom); | |
726 _offsets.set_bottom(new_bottom); | |
727 } | |
728 | |
729 void G1OffsetTableContigSpace::set_end(HeapWord* new_end) { | |
730 Space::set_end(new_end); | |
731 _offsets.resize(new_end - bottom()); | |
732 } | |
733 | |
734 void G1OffsetTableContigSpace::print() const { | |
735 print_short(); | |
736 gclog_or_tty->print_cr(" [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " | |
737 INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
738 bottom(), top(), _offsets.threshold(), end()); | |
739 } | |
740 | |
741 HeapWord* G1OffsetTableContigSpace::initialize_threshold() { | |
742 return _offsets.initialize_threshold(); | |
743 } | |
744 | |
745 HeapWord* G1OffsetTableContigSpace::cross_threshold(HeapWord* start, | |
746 HeapWord* end) { | |
747 _offsets.alloc_block(start, end); | |
748 return _offsets.threshold(); | |
749 } | |
750 | |
751 HeapWord* G1OffsetTableContigSpace::saved_mark_word() const { | |
752 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
753 assert( _gc_time_stamp <= g1h->get_gc_time_stamp(), "invariant" ); | |
754 if (_gc_time_stamp < g1h->get_gc_time_stamp()) | |
755 return top(); | |
756 else | |
757 return ContiguousSpace::saved_mark_word(); | |
758 } | |
759 | |
760 void G1OffsetTableContigSpace::set_saved_mark() { | |
761 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
762 unsigned curr_gc_time_stamp = g1h->get_gc_time_stamp(); | |
763 | |
764 if (_gc_time_stamp < curr_gc_time_stamp) { | |
765 // The order of these is important, as another thread might be | |
766 // about to start scanning this region. If it does so after | |
767 // set_saved_mark and before _gc_time_stamp = ..., then the latter | |
768 // will be false, and it will pick up top() as the high water mark | |
769 // of region. If it does so after _gc_time_stamp = ..., then it | |
770 // will pick up the right saved_mark_word() as the high water mark | |
771 // of the region. Either way, the behaviour will be correct. | |
772 ContiguousSpace::set_saved_mark(); | |
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773 _gc_time_stamp = curr_gc_time_stamp; |
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774 OrderAccess::fence(); |
342 | 775 } |
776 } | |
777 | |
778 G1OffsetTableContigSpace:: | |
779 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
780 MemRegion mr, bool is_zeroed) : | |
781 _offsets(sharedOffsetArray, mr), | |
782 _par_alloc_lock(Mutex::leaf, "OffsetTableContigSpace par alloc lock", true), | |
783 _gc_time_stamp(0) | |
784 { | |
785 _offsets.set_space(this); | |
356 | 786 initialize(mr, !is_zeroed, SpaceDecorator::Mangle); |
342 | 787 } |
788 | |
789 size_t RegionList::length() { | |
790 size_t len = 0; | |
791 HeapRegion* cur = hd(); | |
792 DEBUG_ONLY(HeapRegion* last = NULL); | |
793 while (cur != NULL) { | |
794 len++; | |
795 DEBUG_ONLY(last = cur); | |
796 cur = get_next(cur); | |
797 } | |
798 assert(last == tl(), "Invariant"); | |
799 return len; | |
800 } | |
801 | |
802 void RegionList::insert_before_head(HeapRegion* r) { | |
803 assert(well_formed(), "Inv"); | |
804 set_next(r, hd()); | |
805 _hd = r; | |
806 _sz++; | |
807 if (tl() == NULL) _tl = r; | |
808 assert(well_formed(), "Inv"); | |
809 } | |
810 | |
811 void RegionList::prepend_list(RegionList* new_list) { | |
812 assert(well_formed(), "Precondition"); | |
813 assert(new_list->well_formed(), "Precondition"); | |
814 HeapRegion* new_tl = new_list->tl(); | |
815 if (new_tl != NULL) { | |
816 set_next(new_tl, hd()); | |
817 _hd = new_list->hd(); | |
818 _sz += new_list->sz(); | |
819 if (tl() == NULL) _tl = new_list->tl(); | |
820 } else { | |
821 assert(new_list->hd() == NULL && new_list->sz() == 0, "Inv"); | |
822 } | |
823 assert(well_formed(), "Inv"); | |
824 } | |
825 | |
826 void RegionList::delete_after(HeapRegion* r) { | |
827 assert(well_formed(), "Precondition"); | |
828 HeapRegion* next = get_next(r); | |
829 assert(r != NULL, "Precondition"); | |
830 HeapRegion* next_tl = get_next(next); | |
831 set_next(r, next_tl); | |
832 dec_sz(); | |
833 if (next == tl()) { | |
834 assert(next_tl == NULL, "Inv"); | |
835 _tl = r; | |
836 } | |
837 assert(well_formed(), "Inv"); | |
838 } | |
839 | |
840 HeapRegion* RegionList::pop() { | |
841 assert(well_formed(), "Inv"); | |
842 HeapRegion* res = hd(); | |
843 if (res != NULL) { | |
844 _hd = get_next(res); | |
845 _sz--; | |
846 set_next(res, NULL); | |
847 if (sz() == 0) _tl = NULL; | |
848 } | |
849 assert(well_formed(), "Inv"); | |
850 return res; | |
851 } |