1 /*
2 * Copyright 1997-2010 Sun Microsystems, 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 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/_codeCache.cpp.incl"
27
28 // Helper class for printing in CodeCache
29
30 class CodeBlob_sizes {
31 private:
32 int count;
33 int total_size;
34 int header_size;
35 int code_size;
36 int stub_size;
37 int relocation_size;
38 int scopes_oop_size;
39 int scopes_data_size;
40 int scopes_pcs_size;
41
42 public:
43 CodeBlob_sizes() {
44 count = 0;
45 total_size = 0;
46 header_size = 0;
47 code_size = 0;
48 stub_size = 0;
49 relocation_size = 0;
50 scopes_oop_size = 0;
51 scopes_data_size = 0;
52 scopes_pcs_size = 0;
53 }
54
55 int total() { return total_size; }
56 bool is_empty() { return count == 0; }
57
58 void print(const char* title) {
59 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])",
60 count,
61 title,
62 total() / K,
63 header_size * 100 / total_size,
64 relocation_size * 100 / total_size,
65 code_size * 100 / total_size,
66 stub_size * 100 / total_size,
67 scopes_oop_size * 100 / total_size,
68 scopes_data_size * 100 / total_size,
69 scopes_pcs_size * 100 / total_size);
70 }
71
72 void add(CodeBlob* cb) {
73 count++;
74 total_size += cb->size();
75 header_size += cb->header_size();
76 relocation_size += cb->relocation_size();
77 if (cb->is_nmethod()) {
78 nmethod* nm = cb->as_nmethod_or_null();
79 code_size += nm->code_size();
80 stub_size += nm->stub_size();
81
82 scopes_oop_size += nm->oops_size();
83 scopes_data_size += nm->scopes_data_size();
84 scopes_pcs_size += nm->scopes_pcs_size();
85 } else {
86 code_size += cb->instructions_size();
87 }
88 }
89 };
90
91
92 // CodeCache implementation
93
94 CodeHeap * CodeCache::_heap = new CodeHeap();
95 int CodeCache::_number_of_blobs = 0;
96 int CodeCache::_number_of_nmethods_with_dependencies = 0;
97 bool CodeCache::_needs_cache_clean = false;
98 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
99 nmethod* CodeCache::_saved_nmethods = NULL;
100
101
102 CodeBlob* CodeCache::first() {
103 assert_locked_or_safepoint(CodeCache_lock);
104 return (CodeBlob*)_heap->first();
105 }
106
107
108 CodeBlob* CodeCache::next(CodeBlob* cb) {
109 assert_locked_or_safepoint(CodeCache_lock);
110 return (CodeBlob*)_heap->next(cb);
111 }
112
113
114 CodeBlob* CodeCache::alive(CodeBlob *cb) {
115 assert_locked_or_safepoint(CodeCache_lock);
116 while (cb != NULL && !cb->is_alive()) cb = next(cb);
117 return cb;
118 }
119
120
121 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
122 assert_locked_or_safepoint(CodeCache_lock);
123 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
124 return (nmethod*)cb;
125 }
126
127
128 CodeBlob* CodeCache::allocate(int size) {
129 // Do not seize the CodeCache lock here--if the caller has not
130 // already done so, we are going to lose bigtime, since the code
131 // cache will contain a garbage CodeBlob until the caller can
132 // run the constructor for the CodeBlob subclass he is busy
133 // instantiating.
134 guarantee(size >= 0, "allocation request must be reasonable");
135 assert_locked_or_safepoint(CodeCache_lock);
136 CodeBlob* cb = NULL;
137 _number_of_blobs++;
138 while (true) {
139 cb = (CodeBlob*)_heap->allocate(size);
140 if (cb != NULL) break;
141 if (!_heap->expand_by(CodeCacheExpansionSize)) {
142 // Expansion failed
143 return NULL;
144 }
145 if (PrintCodeCacheExtension) {
146 ResourceMark rm;
147 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
148 (intptr_t)_heap->begin(), (intptr_t)_heap->end(),
149 (address)_heap->end() - (address)_heap->begin());
150 }
151 }
152 verify_if_often();
153 print_trace("allocation", cb, size);
154 return cb;
155 }
156
157 void CodeCache::free(CodeBlob* cb) {
158 assert_locked_or_safepoint(CodeCache_lock);
159 verify_if_often();
160
161 print_trace("free", cb);
162 if (cb->is_nmethod() && ((nmethod *)cb)->has_dependencies()) {
163 _number_of_nmethods_with_dependencies--;
164 }
165 _number_of_blobs--;
166
167 _heap->deallocate(cb);
168
169 verify_if_often();
170 assert(_number_of_blobs >= 0, "sanity check");
171 }
172
173
174 void CodeCache::commit(CodeBlob* cb) {
175 // this is called by nmethod::nmethod, which must already own CodeCache_lock
176 assert_locked_or_safepoint(CodeCache_lock);
177 if (cb->is_nmethod() && ((nmethod *)cb)->has_dependencies()) {
178 _number_of_nmethods_with_dependencies++;
179 }
180 // flush the hardware I-cache
181 ICache::invalidate_range(cb->instructions_begin(), cb->instructions_size());
182 }
183
184
185 void CodeCache::flush() {
186 assert_locked_or_safepoint(CodeCache_lock);
187 Unimplemented();
188 }
189
190
191 // Iteration over CodeBlobs
192
193 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) )
194 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
195 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
196
197
198 bool CodeCache::contains(void *p) {
199 // It should be ok to call contains without holding a lock
200 return _heap->contains(p);
201 }
202
203
204 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
205 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
206 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
207 CodeBlob* CodeCache::find_blob(void* start) {
208 CodeBlob* result = find_blob_unsafe(start);
209 if (result == NULL) return NULL;
210 // We could potientially look up non_entrant methods
211 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
212 return result;
213 }
214
215 nmethod* CodeCache::find_nmethod(void* start) {
216 CodeBlob *cb = find_blob(start);
217 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
218 return (nmethod*)cb;
219 }
220
221
222 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
223 assert_locked_or_safepoint(CodeCache_lock);
224 FOR_ALL_BLOBS(p) {
225 f(p);
226 }
227 }
228
229
230 void CodeCache::nmethods_do(void f(nmethod* nm)) {
231 assert_locked_or_safepoint(CodeCache_lock);
232 FOR_ALL_BLOBS(nm) {
233 if (nm->is_nmethod()) f((nmethod*)nm);
234 }
235 }
236
237
238 int CodeCache::alignment_unit() {
239 return (int)_heap->alignment_unit();
240 }
241
242
243 int CodeCache::alignment_offset() {
244 return (int)_heap->alignment_offset();
245 }
246
247
248 // Mark code blobs for unloading if they contain otherwise
249 // unreachable oops.
250 void CodeCache::do_unloading(BoolObjectClosure* is_alive,
251 OopClosure* keep_alive,
252 bool unloading_occurred) {
253 assert_locked_or_safepoint(CodeCache_lock);
254 FOR_ALL_ALIVE_BLOBS(cb) {
255 cb->do_unloading(is_alive, keep_alive, unloading_occurred);
256 }
257 }
258
259 void CodeCache::blobs_do(CodeBlobClosure* f) {
260 assert_locked_or_safepoint(CodeCache_lock);
261 FOR_ALL_ALIVE_BLOBS(cb) {
262 f->do_code_blob(cb);
263
264 #ifdef ASSERT
265 if (cb->is_nmethod())
266 ((nmethod*)cb)->verify_scavenge_root_oops();
267 #endif //ASSERT
268 }
269 }
270
271 // Walk the list of methods which might contain non-perm oops.
272 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
273 assert_locked_or_safepoint(CodeCache_lock);
274 debug_only(mark_scavenge_root_nmethods());
275
276 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
277 debug_only(cur->clear_scavenge_root_marked());
278 assert(cur->scavenge_root_not_marked(), "");
279 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
280
281 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
282 #ifndef PRODUCT
283 if (TraceScavenge) {
284 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
285 }
286 #endif //PRODUCT
287 if (is_live) {
288 // Perform cur->oops_do(f), maybe just once per nmethod.
289 f->do_code_blob(cur);
290 cur->fix_oop_relocations();
291 }
292 }
293
294 // Check for stray marks.
295 debug_only(verify_perm_nmethods(NULL));
296 }
297
298 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
299 assert_locked_or_safepoint(CodeCache_lock);
300 nm->set_on_scavenge_root_list();
301 nm->set_scavenge_root_link(_scavenge_root_nmethods);
302 set_scavenge_root_nmethods(nm);
303 print_trace("add_scavenge_root", nm);
304 }
305
306 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
307 assert_locked_or_safepoint(CodeCache_lock);
308 print_trace("drop_scavenge_root", nm);
309 nmethod* last = NULL;
310 nmethod* cur = scavenge_root_nmethods();
311 while (cur != NULL) {
312 nmethod* next = cur->scavenge_root_link();
313 if (cur == nm) {
314 if (last != NULL)
315 last->set_scavenge_root_link(next);
316 else set_scavenge_root_nmethods(next);
317 nm->set_scavenge_root_link(NULL);
318 nm->clear_on_scavenge_root_list();
319 return;
320 }
321 last = cur;
322 cur = next;
323 }
324 assert(false, "should have been on list");
325 }
326
327 void CodeCache::prune_scavenge_root_nmethods() {
328 assert_locked_or_safepoint(CodeCache_lock);
329 debug_only(mark_scavenge_root_nmethods());
330
331 nmethod* last = NULL;
332 nmethod* cur = scavenge_root_nmethods();
333 while (cur != NULL) {
334 nmethod* next = cur->scavenge_root_link();
335 debug_only(cur->clear_scavenge_root_marked());
336 assert(cur->scavenge_root_not_marked(), "");
337 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
338
339 if (!cur->is_zombie() && !cur->is_unloaded()
340 && cur->detect_scavenge_root_oops()) {
341 // Keep it. Advance 'last' to prevent deletion.
342 last = cur;
343 } else {
344 // Prune it from the list, so we don't have to look at it any more.
345 print_trace("prune_scavenge_root", cur);
346 cur->set_scavenge_root_link(NULL);
347 cur->clear_on_scavenge_root_list();
348 if (last != NULL)
349 last->set_scavenge_root_link(next);
350 else set_scavenge_root_nmethods(next);
351 }
352 cur = next;
353 }
354
355 // Check for stray marks.
356 debug_only(verify_perm_nmethods(NULL));
357 }
358
359 #ifndef PRODUCT
360 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
361 // While we are here, verify the integrity of the list.
362 mark_scavenge_root_nmethods();
363 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
364 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
365 cur->clear_scavenge_root_marked();
366 }
367 verify_perm_nmethods(f);
368 }
369
370 // Temporarily mark nmethods that are claimed to be on the non-perm list.
371 void CodeCache::mark_scavenge_root_nmethods() {
372 FOR_ALL_ALIVE_BLOBS(cb) {
373 if (cb->is_nmethod()) {
374 nmethod *nm = (nmethod*)cb;
375 assert(nm->scavenge_root_not_marked(), "clean state");
376 if (nm->on_scavenge_root_list())
377 nm->set_scavenge_root_marked();
378 }
379 }
380 }
381
382 // If the closure is given, run it on the unlisted nmethods.
383 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
384 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
385 FOR_ALL_ALIVE_BLOBS(cb) {
386 bool call_f = (f_or_null != NULL);
387 if (cb->is_nmethod()) {
388 nmethod *nm = (nmethod*)cb;
389 assert(nm->scavenge_root_not_marked(), "must be already processed");
390 if (nm->on_scavenge_root_list())
391 call_f = false; // don't show this one to the client
392 nm->verify_scavenge_root_oops();
393 } else {
394 call_f = false; // not an nmethod
395 }
396 if (call_f) f_or_null->do_code_blob(cb);
397 }
398 }
399 #endif //PRODUCT
400
401
402 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) {
403 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
404 nmethod* saved = _saved_nmethods;
405 nmethod* prev = NULL;
406 while (saved != NULL) {
407 if (saved->is_in_use() && saved->method() == m) {
408 if (prev != NULL) {
409 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
410 } else {
411 _saved_nmethods = saved->saved_nmethod_link();
412 }
413 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
414 saved->set_speculatively_disconnected(false);
415 saved->set_saved_nmethod_link(NULL);
416 if (PrintMethodFlushing) {
417 saved->print_on(tty, " ### nmethod is reconnected");
418 }
419 if (LogCompilation && (xtty != NULL)) {
420 ttyLocker ttyl;
421 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
422 xtty->method(methodOop(m));
423 xtty->stamp();
424 xtty->end_elem();
425 }
426 return saved;
427 }
428 prev = saved;
429 saved = saved->saved_nmethod_link();
430 }
431 return NULL;
432 }
433
434 void CodeCache::remove_saved_code(nmethod* nm) {
435 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
436 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
437 nmethod* saved = _saved_nmethods;
438 nmethod* prev = NULL;
439 while (saved != NULL) {
440 if (saved == nm) {
441 if (prev != NULL) {
442 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
443 } else {
444 _saved_nmethods = saved->saved_nmethod_link();
445 }
446 if (LogCompilation && (xtty != NULL)) {
447 ttyLocker ttyl;
448 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
449 xtty->stamp();
450 xtty->end_elem();
451 }
452 return;
453 }
454 prev = saved;
455 saved = saved->saved_nmethod_link();
456 }
457 ShouldNotReachHere();
458 }
459
460 void CodeCache::speculatively_disconnect(nmethod* nm) {
461 assert_locked_or_safepoint(CodeCache_lock);
462 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
463 nm->set_saved_nmethod_link(_saved_nmethods);
464 _saved_nmethods = nm;
465 if (PrintMethodFlushing) {
466 nm->print_on(tty, " ### nmethod is speculatively disconnected");
467 }
468 if (LogCompilation && (xtty != NULL)) {
469 ttyLocker ttyl;
470 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
471 xtty->method(methodOop(nm->method()));
472 xtty->stamp();
473 xtty->end_elem();
474 }
475 nm->method()->clear_code();
476 nm->set_speculatively_disconnected(true);
477 }
478
479
480 void CodeCache::gc_prologue() {
481 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
482 }
483
484
485 void CodeCache::gc_epilogue() {
486 assert_locked_or_safepoint(CodeCache_lock);
487 FOR_ALL_ALIVE_BLOBS(cb) {
488 if (cb->is_nmethod()) {
489 nmethod *nm = (nmethod*)cb;
490 assert(!nm->is_unloaded(), "Tautology");
491 if (needs_cache_clean()) {
492 nm->cleanup_inline_caches();
493 }
494 DEBUG_ONLY(nm->verify());
495 nm->fix_oop_relocations();
496 }
497 }
498 set_needs_cache_clean(false);
499 prune_scavenge_root_nmethods();
500 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
501 }
502
503
504 address CodeCache::first_address() {
505 assert_locked_or_safepoint(CodeCache_lock);
506 return (address)_heap->begin();
507 }
508
509
510 address CodeCache::last_address() {
511 assert_locked_or_safepoint(CodeCache_lock);
512 return (address)_heap->end();
513 }
514
515
516 void icache_init();
517
518 void CodeCache::initialize() {
519 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
520 #ifdef COMPILER2
521 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
522 #endif
523 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
524 // This was originally just a check of the alignment, causing failure, instead, round
525 // the code cache to the page size. In particular, Solaris is moving to a larger
526 // default page size.
527 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
528 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
529 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
530 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
531 vm_exit_during_initialization("Could not reserve enough space for code cache");
532 }
533
534 MemoryService::add_code_heap_memory_pool(_heap);
535
536 // Initialize ICache flush mechanism
537 // This service is needed for os::register_code_area
538 icache_init();
539
540 // Give OS a chance to register generated code area.
541 // This is used on Windows 64 bit platforms to register
542 // Structured Exception Handlers for our generated code.
543 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
544 }
545
546
547 void codeCache_init() {
548 CodeCache::initialize();
549 }
550
551 //------------------------------------------------------------------------------------------------
552
553 int CodeCache::number_of_nmethods_with_dependencies() {
554 return _number_of_nmethods_with_dependencies;
555 }
556
557 void CodeCache::clear_inline_caches() {
558 assert_locked_or_safepoint(CodeCache_lock);
559 FOR_ALL_ALIVE_NMETHODS(nm) {
560 nm->clear_inline_caches();
561 }
562 }
563
564 #ifndef PRODUCT
565 // used to keep track of how much time is spent in mark_for_deoptimization
566 static elapsedTimer dependentCheckTime;
567 static int dependentCheckCount = 0;
568 #endif // PRODUCT
569
570
571 int CodeCache::mark_for_deoptimization(DepChange& changes) {
572 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
573
574 #ifndef PRODUCT
575 dependentCheckTime.start();
576 dependentCheckCount++;
577 #endif // PRODUCT
578
579 int number_of_marked_CodeBlobs = 0;
580
581 // search the hierarchy looking for nmethods which are affected by the loading of this class
582
583 // then search the interfaces this class implements looking for nmethods
584 // which might be dependent of the fact that an interface only had one
585 // implementor.
586
587 { No_Safepoint_Verifier nsv;
588 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
589 klassOop d = str.klass();
590 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes);
591 }
592 }
593
594 if (VerifyDependencies) {
595 // Turn off dependency tracing while actually testing deps.
596 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
597 FOR_ALL_ALIVE_NMETHODS(nm) {
598 if (!nm->is_marked_for_deoptimization() &&
599 nm->check_all_dependencies()) {
600 ResourceMark rm;
601 tty->print_cr("Should have been marked for deoptimization:");
602 changes.print();
603 nm->print();
604 nm->print_dependencies();
605 }
606 }
607 }
608
609 #ifndef PRODUCT
610 dependentCheckTime.stop();
611 #endif // PRODUCT
612
613 return number_of_marked_CodeBlobs;
614 }
615
616
617 #ifdef HOTSWAP
618 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
619 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
620 int number_of_marked_CodeBlobs = 0;
621
622 // Deoptimize all methods of the evolving class itself
623 objArrayOop old_methods = dependee->methods();
624 for (int i = 0; i < old_methods->length(); i++) {
625 ResourceMark rm;
626 methodOop old_method = (methodOop) old_methods->obj_at(i);
627 nmethod *nm = old_method->code();
628 if (nm != NULL) {
629 nm->mark_for_deoptimization();
630 number_of_marked_CodeBlobs++;
631 }
632 }
633
634 FOR_ALL_ALIVE_NMETHODS(nm) {
635 if (nm->is_marked_for_deoptimization()) {
636 // ...Already marked in the previous pass; don't count it again.
637 } else if (nm->is_evol_dependent_on(dependee())) {
638 ResourceMark rm;
639 nm->mark_for_deoptimization();
640 number_of_marked_CodeBlobs++;
641 } else {
642 // flush caches in case they refer to a redefined methodOop
643 nm->clear_inline_caches();
644 }
645 }
646
647 return number_of_marked_CodeBlobs;
648 }
649 #endif // HOTSWAP
650
651
652 // Deoptimize all methods
653 void CodeCache::mark_all_nmethods_for_deoptimization() {
654 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
655 FOR_ALL_ALIVE_NMETHODS(nm) {
656 nm->mark_for_deoptimization();
657 }
658 }
659
660
661 int CodeCache::mark_for_deoptimization(methodOop dependee) {
662 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
663 int number_of_marked_CodeBlobs = 0;
664
665 FOR_ALL_ALIVE_NMETHODS(nm) {
666 if (nm->is_dependent_on_method(dependee)) {
667 ResourceMark rm;
668 nm->mark_for_deoptimization();
669 number_of_marked_CodeBlobs++;
670 }
671 }
672
673 return number_of_marked_CodeBlobs;
674 }
675
676 void CodeCache::make_marked_nmethods_zombies() {
677 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
678 FOR_ALL_ALIVE_NMETHODS(nm) {
679 if (nm->is_marked_for_deoptimization()) {
680
681 // If the nmethod has already been made non-entrant and it can be converted
682 // then zombie it now. Otherwise make it non-entrant and it will eventually
683 // be zombied when it is no longer seen on the stack. Note that the nmethod
684 // might be "entrant" and not on the stack and so could be zombied immediately
685 // but we can't tell because we don't track it on stack until it becomes
686 // non-entrant.
687
688 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
689 nm->make_zombie();
690 } else {
691 nm->make_not_entrant();
692 }
693 }
694 }
695 }
696
697 void CodeCache::make_marked_nmethods_not_entrant() {
698 assert_locked_or_safepoint(CodeCache_lock);
699 FOR_ALL_ALIVE_NMETHODS(nm) {
700 if (nm->is_marked_for_deoptimization()) {
701 nm->make_not_entrant();
702 }
703 }
704 }
705
706 void CodeCache::verify() {
707 _heap->verify();
708 FOR_ALL_ALIVE_BLOBS(p) {
709 p->verify();
710 }
711 }
712
713 //------------------------------------------------------------------------------------------------
714 // Non-product version
715
716 #ifndef PRODUCT
717
718 void CodeCache::verify_if_often() {
719 if (VerifyCodeCacheOften) {
720 _heap->verify();
721 }
722 }
723
724 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
725 if (PrintCodeCache2) { // Need to add a new flag
726 ResourceMark rm;
727 if (size == 0) size = cb->size();
728 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
729 }
730 }
731
732 void CodeCache::print_internals() {
733 int nmethodCount = 0;
734 int runtimeStubCount = 0;
735 int adapterCount = 0;
736 int deoptimizationStubCount = 0;
737 int uncommonTrapStubCount = 0;
738 int bufferBlobCount = 0;
739 int total = 0;
740 int nmethodAlive = 0;
741 int nmethodNotEntrant = 0;
742 int nmethodZombie = 0;
743 int nmethodUnloaded = 0;
744 int nmethodJava = 0;
745 int nmethodNative = 0;
746 int maxCodeSize = 0;
747 ResourceMark rm;
748
749 CodeBlob *cb;
750 for (cb = first(); cb != NULL; cb = next(cb)) {
751 total++;
752 if (cb->is_nmethod()) {
753 nmethod* nm = (nmethod*)cb;
754
755 if (Verbose && nm->method() != NULL) {
756 ResourceMark rm;
757 char *method_name = nm->method()->name_and_sig_as_C_string();
758 tty->print("%s", method_name);
759 if(nm->is_alive()) { tty->print_cr(" alive"); }
760 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
761 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
762 }
763
764 nmethodCount++;
765
766 if(nm->is_alive()) { nmethodAlive++; }
767 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
768 if(nm->is_zombie()) { nmethodZombie++; }
769 if(nm->is_unloaded()) { nmethodUnloaded++; }
770 if(nm->is_native_method()) { nmethodNative++; }
771
772 if(nm->method() != NULL && nm->is_java_method()) {
773 nmethodJava++;
774 if(nm->code_size() > maxCodeSize) {
775 maxCodeSize = nm->code_size();
776 }
777 }
778 } else if (cb->is_runtime_stub()) {
779 runtimeStubCount++;
780 } else if (cb->is_deoptimization_stub()) {
781 deoptimizationStubCount++;
782 } else if (cb->is_uncommon_trap_stub()) {
783 uncommonTrapStubCount++;
784 } else if (cb->is_adapter_blob()) {
785 adapterCount++;
786 } else if (cb->is_buffer_blob()) {
787 bufferBlobCount++;
788 }
789 }
790
791 int bucketSize = 512;
792 int bucketLimit = maxCodeSize / bucketSize + 1;
793 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit);
794 memset(buckets,0,sizeof(int) * bucketLimit);
795
796 for (cb = first(); cb != NULL; cb = next(cb)) {
797 if (cb->is_nmethod()) {
798 nmethod* nm = (nmethod*)cb;
799 if(nm->is_java_method()) {
800 buckets[nm->code_size() / bucketSize]++;
801 }
802 }
803 }
804 tty->print_cr("Code Cache Entries (total of %d)",total);
805 tty->print_cr("-------------------------------------------------");
806 tty->print_cr("nmethods: %d",nmethodCount);
807 tty->print_cr("\talive: %d",nmethodAlive);
808 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
809 tty->print_cr("\tzombie: %d",nmethodZombie);
810 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
811 tty->print_cr("\tjava: %d",nmethodJava);
812 tty->print_cr("\tnative: %d",nmethodNative);
813 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
814 tty->print_cr("adapters: %d",adapterCount);
815 tty->print_cr("buffer blobs: %d",bufferBlobCount);
816 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
817 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
818 tty->print_cr("\nnmethod size distribution (non-zombie java)");
819 tty->print_cr("-------------------------------------------------");
820
821 for(int i=0; i<bucketLimit; i++) {
822 if(buckets[i] != 0) {
823 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
824 tty->fill_to(40);
825 tty->print_cr("%d",buckets[i]);
826 }
827 }
828
829 FREE_C_HEAP_ARRAY(int, buckets);
830 }
831
832 void CodeCache::print() {
833 CodeBlob_sizes live;
834 CodeBlob_sizes dead;
835
836 FOR_ALL_BLOBS(p) {
837 if (!p->is_alive()) {
838 dead.add(p);
839 } else {
840 live.add(p);
841 }
842 }
843
844 tty->print_cr("CodeCache:");
845
846 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),
847 dependentCheckTime.seconds() / dependentCheckCount);
848
849 if (!live.is_empty()) {
850 live.print("live");
851 }
852 if (!dead.is_empty()) {
853 dead.print("dead");
854 }
855
856
857 if (Verbose) {
858 // print the oop_map usage
859 int code_size = 0;
860 int number_of_blobs = 0;
861 int number_of_oop_maps = 0;
862 int map_size = 0;
863 FOR_ALL_BLOBS(p) {
864 if (p->is_alive()) {
865 number_of_blobs++;
866 code_size += p->instructions_size();
867 OopMapSet* set = p->oop_maps();
868 if (set != NULL) {
869 number_of_oop_maps += set->size();
870 map_size += set->heap_size();
871 }
872 }
873 }
874 tty->print_cr("OopMaps");
875 tty->print_cr(" #blobs = %d", number_of_blobs);
876 tty->print_cr(" code size = %d", code_size);
877 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
878 tty->print_cr(" map size = %d", map_size);
879 }
880
881 }
882
883 #endif // PRODUCT