1 /*
2 * Copyright 1997-2007 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 scopes_oop_size += cb->oops_size();
78 if (cb->is_nmethod()) {
79 nmethod *nm = (nmethod*)cb;
80 code_size += nm->code_size();
81 stub_size += nm->stub_size();
82
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 }
291
292 // Check for stray marks.
293 debug_only(verify_perm_nmethods(NULL));
294 }
295
296 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
297 assert_locked_or_safepoint(CodeCache_lock);
298 nm->set_on_scavenge_root_list();
299 nm->set_scavenge_root_link(_scavenge_root_nmethods);
300 set_scavenge_root_nmethods(nm);
301 print_trace("add_scavenge_root", nm);
302 }
303
304 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
305 assert_locked_or_safepoint(CodeCache_lock);
306 print_trace("drop_scavenge_root", nm);
307 nmethod* last = NULL;
308 nmethod* cur = scavenge_root_nmethods();
309 while (cur != NULL) {
310 nmethod* next = cur->scavenge_root_link();
311 if (cur == nm) {
312 if (last != NULL)
313 last->set_scavenge_root_link(next);
314 else set_scavenge_root_nmethods(next);
315 nm->set_scavenge_root_link(NULL);
316 nm->clear_on_scavenge_root_list();
317 return;
318 }
319 last = cur;
320 cur = next;
321 }
322 assert(false, "should have been on list");
323 }
324
325 void CodeCache::prune_scavenge_root_nmethods() {
326 assert_locked_or_safepoint(CodeCache_lock);
327 debug_only(mark_scavenge_root_nmethods());
328
329 nmethod* last = NULL;
330 nmethod* cur = scavenge_root_nmethods();
331 while (cur != NULL) {
332 nmethod* next = cur->scavenge_root_link();
333 debug_only(cur->clear_scavenge_root_marked());
334 assert(cur->scavenge_root_not_marked(), "");
335 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
336
337 if (!cur->is_zombie() && !cur->is_unloaded()
338 && cur->detect_scavenge_root_oops()) {
339 // Keep it. Advance 'last' to prevent deletion.
340 last = cur;
341 } else {
342 // Prune it from the list, so we don't have to look at it any more.
343 print_trace("prune_scavenge_root", cur);
344 cur->set_scavenge_root_link(NULL);
345 cur->clear_on_scavenge_root_list();
346 if (last != NULL)
347 last->set_scavenge_root_link(next);
348 else set_scavenge_root_nmethods(next);
349 }
350 cur = next;
351 }
352
353 // Check for stray marks.
354 debug_only(verify_perm_nmethods(NULL));
355 }
356
357 #ifndef PRODUCT
358 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
359 // While we are here, verify the integrity of the list.
360 mark_scavenge_root_nmethods();
361 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
362 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
363 cur->clear_scavenge_root_marked();
364 }
365 verify_perm_nmethods(f);
366 }
367
368 // Temporarily mark nmethods that are claimed to be on the non-perm list.
369 void CodeCache::mark_scavenge_root_nmethods() {
370 FOR_ALL_ALIVE_BLOBS(cb) {
371 if (cb->is_nmethod()) {
372 nmethod *nm = (nmethod*)cb;
373 assert(nm->scavenge_root_not_marked(), "clean state");
374 if (nm->on_scavenge_root_list())
375 nm->set_scavenge_root_marked();
376 }
377 }
378 }
379
380 // If the closure is given, run it on the unlisted nmethods.
381 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
382 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
383 FOR_ALL_ALIVE_BLOBS(cb) {
384 bool call_f = (f_or_null != NULL);
385 if (cb->is_nmethod()) {
386 nmethod *nm = (nmethod*)cb;
387 assert(nm->scavenge_root_not_marked(), "must be already processed");
388 if (nm->on_scavenge_root_list())
389 call_f = false; // don't show this one to the client
390 nm->verify_scavenge_root_oops();
391 } else {
392 call_f = false; // not an nmethod
393 }
394 if (call_f) f_or_null->do_code_blob(cb);
395 }
396 }
397 #endif //PRODUCT
398
399
400 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) {
401 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
402 nmethod* saved = _saved_nmethods;
403 nmethod* prev = NULL;
404 while (saved != NULL) {
405 if (saved->is_in_use() && saved->method() == m) {
406 if (prev != NULL) {
407 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
408 } else {
409 _saved_nmethods = saved->saved_nmethod_link();
410 }
411 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
412 saved->set_speculatively_disconnected(false);
413 saved->set_saved_nmethod_link(NULL);
414 if (PrintMethodFlushing) {
415 saved->print_on(tty, " ### nmethod is reconnected");
416 }
417 if (LogCompilation && (xtty != NULL)) {
418 ttyLocker ttyl;
419 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
420 xtty->method(methodOop(m));
421 xtty->stamp();
422 xtty->end_elem();
423 }
424 return saved;
425 }
426 prev = saved;
427 saved = saved->saved_nmethod_link();
428 }
429 return NULL;
430 }
431
432 void CodeCache::remove_saved_code(nmethod* nm) {
433 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
434 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
435 nmethod* saved = _saved_nmethods;
436 nmethod* prev = NULL;
437 while (saved != NULL) {
438 if (saved == nm) {
439 if (prev != NULL) {
440 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
441 } else {
442 _saved_nmethods = saved->saved_nmethod_link();
443 }
444 if (LogCompilation && (xtty != NULL)) {
445 ttyLocker ttyl;
446 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
447 xtty->stamp();
448 xtty->end_elem();
449 }
450 return;
451 }
452 prev = saved;
453 saved = saved->saved_nmethod_link();
454 }
455 ShouldNotReachHere();
456 }
457
458 void CodeCache::speculatively_disconnect(nmethod* nm) {
459 assert_locked_or_safepoint(CodeCache_lock);
460 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
461 nm->set_saved_nmethod_link(_saved_nmethods);
462 _saved_nmethods = nm;
463 if (PrintMethodFlushing) {
464 nm->print_on(tty, " ### nmethod is speculatively disconnected");
465 }
466 if (LogCompilation && (xtty != NULL)) {
467 ttyLocker ttyl;
468 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
469 xtty->method(methodOop(nm->method()));
470 xtty->stamp();
471 xtty->end_elem();
472 }
473 nm->method()->clear_code();
474 nm->set_speculatively_disconnected(true);
475 }
476
477
478 void CodeCache::gc_prologue() {
479 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
480 }
481
482
483 void CodeCache::gc_epilogue() {
484 assert_locked_or_safepoint(CodeCache_lock);
485 FOR_ALL_ALIVE_BLOBS(cb) {
486 if (cb->is_nmethod()) {
487 nmethod *nm = (nmethod*)cb;
488 assert(!nm->is_unloaded(), "Tautology");
489 if (needs_cache_clean()) {
490 nm->cleanup_inline_caches();
491 }
492 debug_only(nm->verify();)
493 }
494 cb->fix_oop_relocations();
495 }
496 set_needs_cache_clean(false);
497 prune_scavenge_root_nmethods();
498 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
499 }
500
501
502 address CodeCache::first_address() {
503 assert_locked_or_safepoint(CodeCache_lock);
504 return (address)_heap->begin();
505 }
506
507
508 address CodeCache::last_address() {
509 assert_locked_or_safepoint(CodeCache_lock);
510 return (address)_heap->end();
511 }
512
513
514 void icache_init();
515
516 void CodeCache::initialize() {
517 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
518 #ifdef COMPILER2
519 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
520 #endif
521 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
522 // This was originally just a check of the alignment, causing failure, instead, round
523 // the code cache to the page size. In particular, Solaris is moving to a larger
524 // default page size.
525 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
526 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
527 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
528 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
529 vm_exit_during_initialization("Could not reserve enough space for code cache");
530 }
531
532 MemoryService::add_code_heap_memory_pool(_heap);
533
534 // Initialize ICache flush mechanism
535 // This service is needed for os::register_code_area
536 icache_init();
537
538 // Give OS a chance to register generated code area.
539 // This is used on Windows 64 bit platforms to register
540 // Structured Exception Handlers for our generated code.
541 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
542 }
543
544
545 void codeCache_init() {
546 CodeCache::initialize();
547 }
548
549 //------------------------------------------------------------------------------------------------
550
551 int CodeCache::number_of_nmethods_with_dependencies() {
552 return _number_of_nmethods_with_dependencies;
553 }
554
555 void CodeCache::clear_inline_caches() {
556 assert_locked_or_safepoint(CodeCache_lock);
557 FOR_ALL_ALIVE_NMETHODS(nm) {
558 nm->clear_inline_caches();
559 }
560 }
561
562 #ifndef PRODUCT
563 // used to keep track of how much time is spent in mark_for_deoptimization
564 static elapsedTimer dependentCheckTime;
565 static int dependentCheckCount = 0;
566 #endif // PRODUCT
567
568
569 int CodeCache::mark_for_deoptimization(DepChange& changes) {
570 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
571
572 #ifndef PRODUCT
573 dependentCheckTime.start();
574 dependentCheckCount++;
575 #endif // PRODUCT
576
577 int number_of_marked_CodeBlobs = 0;
578
579 // search the hierarchy looking for nmethods which are affected by the loading of this class
580
581 // then search the interfaces this class implements looking for nmethods
582 // which might be dependent of the fact that an interface only had one
583 // implementor.
584
585 { No_Safepoint_Verifier nsv;
586 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
587 klassOop d = str.klass();
588 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes);
589 }
590 }
591
592 if (VerifyDependencies) {
593 // Turn off dependency tracing while actually testing deps.
594 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
595 FOR_ALL_ALIVE_NMETHODS(nm) {
596 if (!nm->is_marked_for_deoptimization() &&
597 nm->check_all_dependencies()) {
598 ResourceMark rm;
599 tty->print_cr("Should have been marked for deoptimization:");
600 changes.print();
601 nm->print();
602 nm->print_dependencies();
603 }
604 }
605 }
606
607 #ifndef PRODUCT
608 dependentCheckTime.stop();
609 #endif // PRODUCT
610
611 return number_of_marked_CodeBlobs;
612 }
613
614
615 #ifdef HOTSWAP
616 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
617 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
618 int number_of_marked_CodeBlobs = 0;
619
620 // Deoptimize all methods of the evolving class itself
621 objArrayOop old_methods = dependee->methods();
622 for (int i = 0; i < old_methods->length(); i++) {
623 ResourceMark rm;
624 methodOop old_method = (methodOop) old_methods->obj_at(i);
625 nmethod *nm = old_method->code();
626 if (nm != NULL) {
627 nm->mark_for_deoptimization();
628 number_of_marked_CodeBlobs++;
629 }
630 }
631
632 FOR_ALL_ALIVE_NMETHODS(nm) {
633 if (nm->is_marked_for_deoptimization()) {
634 // ...Already marked in the previous pass; don't count it again.
635 } else if (nm->is_evol_dependent_on(dependee())) {
636 ResourceMark rm;
637 nm->mark_for_deoptimization();
638 number_of_marked_CodeBlobs++;
639 } else {
640 // flush caches in case they refer to a redefined methodOop
641 nm->clear_inline_caches();
642 }
643 }
644
645 return number_of_marked_CodeBlobs;
646 }
647 #endif // HOTSWAP
648
649
650 // Deoptimize all methods
651 void CodeCache::mark_all_nmethods_for_deoptimization() {
652 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
653 FOR_ALL_ALIVE_NMETHODS(nm) {
654 nm->mark_for_deoptimization();
655 }
656 }
657
658
659 int CodeCache::mark_for_deoptimization(methodOop dependee) {
660 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
661 int number_of_marked_CodeBlobs = 0;
662
663 FOR_ALL_ALIVE_NMETHODS(nm) {
664 if (nm->is_dependent_on_method(dependee)) {
665 ResourceMark rm;
666 nm->mark_for_deoptimization();
667 number_of_marked_CodeBlobs++;
668 }
669 }
670
671 return number_of_marked_CodeBlobs;
672 }
673
674 void CodeCache::make_marked_nmethods_zombies() {
675 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
676 FOR_ALL_ALIVE_NMETHODS(nm) {
677 if (nm->is_marked_for_deoptimization()) {
678
679 // If the nmethod has already been made non-entrant and it can be converted
680 // then zombie it now. Otherwise make it non-entrant and it will eventually
681 // be zombied when it is no longer seen on the stack. Note that the nmethod
682 // might be "entrant" and not on the stack and so could be zombied immediately
683 // but we can't tell because we don't track it on stack until it becomes
684 // non-entrant.
685
686 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
687 nm->make_zombie();
688 } else {
689 nm->make_not_entrant();
690 }
691 }
692 }
693 }
694
695 void CodeCache::make_marked_nmethods_not_entrant() {
696 assert_locked_or_safepoint(CodeCache_lock);
697 FOR_ALL_ALIVE_NMETHODS(nm) {
698 if (nm->is_marked_for_deoptimization()) {
699 nm->make_not_entrant();
700 }
701 }
702 }
703
704 void CodeCache::verify() {
705 _heap->verify();
706 FOR_ALL_ALIVE_BLOBS(p) {
707 p->verify();
708 }
709 }
710
711 //------------------------------------------------------------------------------------------------
712 // Non-product version
713
714 #ifndef PRODUCT
715
716 void CodeCache::verify_if_often() {
717 if (VerifyCodeCacheOften) {
718 _heap->verify();
719 }
720 }
721
722 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
723 if (PrintCodeCache2) { // Need to add a new flag
724 ResourceMark rm;
725 if (size == 0) size = cb->size();
726 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
727 }
728 }
729
730 void CodeCache::print_internals() {
731 int nmethodCount = 0;
732 int runtimeStubCount = 0;
733 int adapterCount = 0;
734 int deoptimizationStubCount = 0;
735 int uncommonTrapStubCount = 0;
736 int bufferBlobCount = 0;
737 int total = 0;
738 int nmethodAlive = 0;
739 int nmethodNotEntrant = 0;
740 int nmethodZombie = 0;
741 int nmethodUnloaded = 0;
742 int nmethodJava = 0;
743 int nmethodNative = 0;
744 int maxCodeSize = 0;
745 ResourceMark rm;
746
747 CodeBlob *cb;
748 for (cb = first(); cb != NULL; cb = next(cb)) {
749 total++;
750 if (cb->is_nmethod()) {
751 nmethod* nm = (nmethod*)cb;
752
753 if (Verbose && nm->method() != NULL) {
754 ResourceMark rm;
755 char *method_name = nm->method()->name_and_sig_as_C_string();
756 tty->print("%s", method_name);
757 if(nm->is_alive()) { tty->print_cr(" alive"); }
758 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
759 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
760 }
761
762 nmethodCount++;
763
764 if(nm->is_alive()) { nmethodAlive++; }
765 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
766 if(nm->is_zombie()) { nmethodZombie++; }
767 if(nm->is_unloaded()) { nmethodUnloaded++; }
768 if(nm->is_native_method()) { nmethodNative++; }
769
770 if(nm->method() != NULL && nm->is_java_method()) {
771 nmethodJava++;
772 if(nm->code_size() > maxCodeSize) {
773 maxCodeSize = nm->code_size();
774 }
775 }
776 } else if (cb->is_runtime_stub()) {
777 runtimeStubCount++;
778 } else if (cb->is_deoptimization_stub()) {
779 deoptimizationStubCount++;
780 } else if (cb->is_uncommon_trap_stub()) {
781 uncommonTrapStubCount++;
782 } else if (cb->is_adapter_blob()) {
783 adapterCount++;
784 } else if (cb->is_buffer_blob()) {
785 bufferBlobCount++;
786 }
787 }
788
789 int bucketSize = 512;
790 int bucketLimit = maxCodeSize / bucketSize + 1;
791 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit);
792 memset(buckets,0,sizeof(int) * bucketLimit);
793
794 for (cb = first(); cb != NULL; cb = next(cb)) {
795 if (cb->is_nmethod()) {
796 nmethod* nm = (nmethod*)cb;
797 if(nm->is_java_method()) {
798 buckets[nm->code_size() / bucketSize]++;
799 }
800 }
801 }
802 tty->print_cr("Code Cache Entries (total of %d)",total);
803 tty->print_cr("-------------------------------------------------");
804 tty->print_cr("nmethods: %d",nmethodCount);
805 tty->print_cr("\talive: %d",nmethodAlive);
806 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
807 tty->print_cr("\tzombie: %d",nmethodZombie);
808 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
809 tty->print_cr("\tjava: %d",nmethodJava);
810 tty->print_cr("\tnative: %d",nmethodNative);
811 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
812 tty->print_cr("adapters: %d",adapterCount);
813 tty->print_cr("buffer blobs: %d",bufferBlobCount);
814 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
815 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
816 tty->print_cr("\nnmethod size distribution (non-zombie java)");
817 tty->print_cr("-------------------------------------------------");
818
819 for(int i=0; i<bucketLimit; i++) {
820 if(buckets[i] != 0) {
821 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
822 tty->fill_to(40);
823 tty->print_cr("%d",buckets[i]);
824 }
825 }
826
827 FREE_C_HEAP_ARRAY(int, buckets);
828 }
829
830 void CodeCache::print() {
831 CodeBlob_sizes live;
832 CodeBlob_sizes dead;
833
834 FOR_ALL_BLOBS(p) {
835 if (!p->is_alive()) {
836 dead.add(p);
837 } else {
838 live.add(p);
839 }
840 }
841
842 tty->print_cr("CodeCache:");
843
844 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),
845 dependentCheckTime.seconds() / dependentCheckCount);
846
847 if (!live.is_empty()) {
848 live.print("live");
849 }
850 if (!dead.is_empty()) {
851 dead.print("dead");
852 }
853
854
855 if (Verbose) {
856 // print the oop_map usage
857 int code_size = 0;
858 int number_of_blobs = 0;
859 int number_of_oop_maps = 0;
860 int map_size = 0;
861 FOR_ALL_BLOBS(p) {
862 if (p->is_alive()) {
863 number_of_blobs++;
864 code_size += p->instructions_size();
865 OopMapSet* set = p->oop_maps();
866 if (set != NULL) {
867 number_of_oop_maps += set->size();
868 map_size += set->heap_size();
869 }
870 }
871 }
872 tty->print_cr("OopMaps");
873 tty->print_cr(" #blobs = %d", number_of_blobs);
874 tty->print_cr(" code size = %d", code_size);
875 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
876 tty->print_cr(" map size = %d", map_size);
877 }
878
879 }
880
881 #endif // PRODUCT