1 /*
2 * Copyright (c) 1997, 2010, 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 "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->insts_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->code_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_adapters = 0;
97 int CodeCache::_number_of_nmethods = 0;
98 int CodeCache::_number_of_nmethods_with_dependencies = 0;
99 bool CodeCache::_needs_cache_clean = false;
100 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
101 nmethod* CodeCache::_saved_nmethods = NULL;
102
103
104 CodeBlob* CodeCache::first() {
105 assert_locked_or_safepoint(CodeCache_lock);
106 return (CodeBlob*)_heap->first();
107 }
108
109
110 CodeBlob* CodeCache::next(CodeBlob* cb) {
111 assert_locked_or_safepoint(CodeCache_lock);
112 return (CodeBlob*)_heap->next(cb);
113 }
114
115
116 CodeBlob* CodeCache::alive(CodeBlob *cb) {
117 assert_locked_or_safepoint(CodeCache_lock);
118 while (cb != NULL && !cb->is_alive()) cb = next(cb);
119 return cb;
120 }
121
122
123 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
124 assert_locked_or_safepoint(CodeCache_lock);
125 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
126 return (nmethod*)cb;
127 }
128
129 nmethod* CodeCache::first_nmethod() {
130 assert_locked_or_safepoint(CodeCache_lock);
131 CodeBlob* cb = first();
132 while (cb != NULL && !cb->is_nmethod()) {
133 cb = next(cb);
134 }
135 return (nmethod*)cb;
136 }
137
138 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
139 assert_locked_or_safepoint(CodeCache_lock);
140 cb = next(cb);
141 while (cb != NULL && !cb->is_nmethod()) {
142 cb = next(cb);
143 }
144 return (nmethod*)cb;
145 }
146
147 CodeBlob* CodeCache::allocate(int size) {
148 // Do not seize the CodeCache lock here--if the caller has not
149 // already done so, we are going to lose bigtime, since the code
150 // cache will contain a garbage CodeBlob until the caller can
151 // run the constructor for the CodeBlob subclass he is busy
152 // instantiating.
153 guarantee(size >= 0, "allocation request must be reasonable");
154 assert_locked_or_safepoint(CodeCache_lock);
155 CodeBlob* cb = NULL;
156 _number_of_blobs++;
157 while (true) {
158 cb = (CodeBlob*)_heap->allocate(size);
159 if (cb != NULL) break;
160 if (!_heap->expand_by(CodeCacheExpansionSize)) {
161 // Expansion failed
162 return NULL;
163 }
164 if (PrintCodeCacheExtension) {
165 ResourceMark rm;
166 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
167 (intptr_t)_heap->begin(), (intptr_t)_heap->end(),
168 (address)_heap->end() - (address)_heap->begin());
169 }
170 }
171 verify_if_often();
172 print_trace("allocation", cb, size);
173 return cb;
174 }
175
176 void CodeCache::free(CodeBlob* cb) {
177 assert_locked_or_safepoint(CodeCache_lock);
178 verify_if_often();
179
180 print_trace("free", cb);
181 if (cb->is_nmethod()) {
182 _number_of_nmethods--;
183 if (((nmethod *)cb)->has_dependencies()) {
184 _number_of_nmethods_with_dependencies--;
185 }
186 }
187 if (cb->is_adapter_blob()) {
188 _number_of_adapters--;
189 }
190 _number_of_blobs--;
191
192 _heap->deallocate(cb);
193
194 verify_if_often();
195 assert(_number_of_blobs >= 0, "sanity check");
196 }
197
198
199 void CodeCache::commit(CodeBlob* cb) {
200 // this is called by nmethod::nmethod, which must already own CodeCache_lock
201 assert_locked_or_safepoint(CodeCache_lock);
202 if (cb->is_nmethod()) {
203 _number_of_nmethods++;
204 if (((nmethod *)cb)->has_dependencies()) {
205 _number_of_nmethods_with_dependencies++;
206 }
207 }
208 if (cb->is_adapter_blob()) {
209 _number_of_adapters++;
210 }
211
212 // flush the hardware I-cache
213 ICache::invalidate_range(cb->content_begin(), cb->content_size());
214 }
215
216
217 void CodeCache::flush() {
218 assert_locked_or_safepoint(CodeCache_lock);
219 Unimplemented();
220 }
221
222
223 // Iteration over CodeBlobs
224
225 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) )
226 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
227 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
228
229
230 bool CodeCache::contains(void *p) {
231 // It should be ok to call contains without holding a lock
232 return _heap->contains(p);
233 }
234
235
236 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
237 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
238 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
239 CodeBlob* CodeCache::find_blob(void* start) {
240 CodeBlob* result = find_blob_unsafe(start);
241 if (result == NULL) return NULL;
242 // We could potientially look up non_entrant methods
243 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
244 return result;
245 }
246
247 nmethod* CodeCache::find_nmethod(void* start) {
248 CodeBlob *cb = find_blob(start);
249 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
250 return (nmethod*)cb;
251 }
252
253
254 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
255 assert_locked_or_safepoint(CodeCache_lock);
256 FOR_ALL_BLOBS(p) {
257 f(p);
258 }
259 }
260
261
262 void CodeCache::nmethods_do(void f(nmethod* nm)) {
263 assert_locked_or_safepoint(CodeCache_lock);
264 FOR_ALL_BLOBS(nm) {
265 if (nm->is_nmethod()) f((nmethod*)nm);
266 }
267 }
268
269
270 int CodeCache::alignment_unit() {
271 return (int)_heap->alignment_unit();
272 }
273
274
275 int CodeCache::alignment_offset() {
276 return (int)_heap->alignment_offset();
277 }
278
279
280 // Mark nmethods for unloading if they contain otherwise unreachable
281 // oops.
282 void CodeCache::do_unloading(BoolObjectClosure* is_alive,
283 OopClosure* keep_alive,
284 bool unloading_occurred) {
285 assert_locked_or_safepoint(CodeCache_lock);
286 FOR_ALL_ALIVE_NMETHODS(nm) {
287 nm->do_unloading(is_alive, keep_alive, unloading_occurred);
288 }
289 }
290
291 void CodeCache::blobs_do(CodeBlobClosure* f) {
292 assert_locked_or_safepoint(CodeCache_lock);
293 FOR_ALL_ALIVE_BLOBS(cb) {
294 f->do_code_blob(cb);
295
296 #ifdef ASSERT
297 if (cb->is_nmethod())
298 ((nmethod*)cb)->verify_scavenge_root_oops();
299 #endif //ASSERT
300 }
301 }
302
303 // Walk the list of methods which might contain non-perm oops.
304 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
305 assert_locked_or_safepoint(CodeCache_lock);
306 debug_only(mark_scavenge_root_nmethods());
307
308 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
309 debug_only(cur->clear_scavenge_root_marked());
310 assert(cur->scavenge_root_not_marked(), "");
311 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
312
313 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
314 #ifndef PRODUCT
315 if (TraceScavenge) {
316 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
317 }
318 #endif //PRODUCT
319 if (is_live) {
320 // Perform cur->oops_do(f), maybe just once per nmethod.
321 f->do_code_blob(cur);
322 cur->fix_oop_relocations();
323 }
324 }
325
326 // Check for stray marks.
327 debug_only(verify_perm_nmethods(NULL));
328 }
329
330 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
331 assert_locked_or_safepoint(CodeCache_lock);
332 nm->set_on_scavenge_root_list();
333 nm->set_scavenge_root_link(_scavenge_root_nmethods);
334 set_scavenge_root_nmethods(nm);
335 print_trace("add_scavenge_root", nm);
336 }
337
338 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
339 assert_locked_or_safepoint(CodeCache_lock);
340 print_trace("drop_scavenge_root", nm);
341 nmethod* last = NULL;
342 nmethod* cur = scavenge_root_nmethods();
343 while (cur != NULL) {
344 nmethod* next = cur->scavenge_root_link();
345 if (cur == nm) {
346 if (last != NULL)
347 last->set_scavenge_root_link(next);
348 else set_scavenge_root_nmethods(next);
349 nm->set_scavenge_root_link(NULL);
350 nm->clear_on_scavenge_root_list();
351 return;
352 }
353 last = cur;
354 cur = next;
355 }
356 assert(false, "should have been on list");
357 }
358
359 void CodeCache::prune_scavenge_root_nmethods() {
360 assert_locked_or_safepoint(CodeCache_lock);
361 debug_only(mark_scavenge_root_nmethods());
362
363 nmethod* last = NULL;
364 nmethod* cur = scavenge_root_nmethods();
365 while (cur != NULL) {
366 nmethod* next = cur->scavenge_root_link();
367 debug_only(cur->clear_scavenge_root_marked());
368 assert(cur->scavenge_root_not_marked(), "");
369 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
370
371 if (!cur->is_zombie() && !cur->is_unloaded()
372 && cur->detect_scavenge_root_oops()) {
373 // Keep it. Advance 'last' to prevent deletion.
374 last = cur;
375 } else {
376 // Prune it from the list, so we don't have to look at it any more.
377 print_trace("prune_scavenge_root", cur);
378 cur->set_scavenge_root_link(NULL);
379 cur->clear_on_scavenge_root_list();
380 if (last != NULL)
381 last->set_scavenge_root_link(next);
382 else set_scavenge_root_nmethods(next);
383 }
384 cur = next;
385 }
386
387 // Check for stray marks.
388 debug_only(verify_perm_nmethods(NULL));
389 }
390
391 #ifndef PRODUCT
392 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
393 // While we are here, verify the integrity of the list.
394 mark_scavenge_root_nmethods();
395 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
396 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
397 cur->clear_scavenge_root_marked();
398 }
399 verify_perm_nmethods(f);
400 }
401
402 // Temporarily mark nmethods that are claimed to be on the non-perm list.
403 void CodeCache::mark_scavenge_root_nmethods() {
404 FOR_ALL_ALIVE_BLOBS(cb) {
405 if (cb->is_nmethod()) {
406 nmethod *nm = (nmethod*)cb;
407 assert(nm->scavenge_root_not_marked(), "clean state");
408 if (nm->on_scavenge_root_list())
409 nm->set_scavenge_root_marked();
410 }
411 }
412 }
413
414 // If the closure is given, run it on the unlisted nmethods.
415 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
416 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
417 FOR_ALL_ALIVE_BLOBS(cb) {
418 bool call_f = (f_or_null != NULL);
419 if (cb->is_nmethod()) {
420 nmethod *nm = (nmethod*)cb;
421 assert(nm->scavenge_root_not_marked(), "must be already processed");
422 if (nm->on_scavenge_root_list())
423 call_f = false; // don't show this one to the client
424 nm->verify_scavenge_root_oops();
425 } else {
426 call_f = false; // not an nmethod
427 }
428 if (call_f) f_or_null->do_code_blob(cb);
429 }
430 }
431 #endif //PRODUCT
432
433
434 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) {
435 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
436 nmethod* saved = _saved_nmethods;
437 nmethod* prev = NULL;
438 while (saved != NULL) {
439 if (saved->is_in_use() && saved->method() == m) {
440 if (prev != NULL) {
441 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
442 } else {
443 _saved_nmethods = saved->saved_nmethod_link();
444 }
445 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
446 saved->set_speculatively_disconnected(false);
447 saved->set_saved_nmethod_link(NULL);
448 if (PrintMethodFlushing) {
449 saved->print_on(tty, " ### nmethod is reconnected\n");
450 }
451 if (LogCompilation && (xtty != NULL)) {
452 ttyLocker ttyl;
453 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
454 xtty->method(methodOop(m));
455 xtty->stamp();
456 xtty->end_elem();
457 }
458 return saved;
459 }
460 prev = saved;
461 saved = saved->saved_nmethod_link();
462 }
463 return NULL;
464 }
465
466 void CodeCache::remove_saved_code(nmethod* nm) {
467 // For conc swpr this will be called with CodeCache_lock taken by caller
468 assert_locked_or_safepoint(CodeCache_lock);
469 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
470 nmethod* saved = _saved_nmethods;
471 nmethod* prev = NULL;
472 while (saved != NULL) {
473 if (saved == nm) {
474 if (prev != NULL) {
475 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
476 } else {
477 _saved_nmethods = saved->saved_nmethod_link();
478 }
479 if (LogCompilation && (xtty != NULL)) {
480 ttyLocker ttyl;
481 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
482 xtty->stamp();
483 xtty->end_elem();
484 }
485 return;
486 }
487 prev = saved;
488 saved = saved->saved_nmethod_link();
489 }
490 ShouldNotReachHere();
491 }
492
493 void CodeCache::speculatively_disconnect(nmethod* nm) {
494 assert_locked_or_safepoint(CodeCache_lock);
495 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
496 nm->set_saved_nmethod_link(_saved_nmethods);
497 _saved_nmethods = nm;
498 if (PrintMethodFlushing) {
499 nm->print_on(tty, " ### nmethod is speculatively disconnected\n");
500 }
501 if (LogCompilation && (xtty != NULL)) {
502 ttyLocker ttyl;
503 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
504 xtty->method(methodOop(nm->method()));
505 xtty->stamp();
506 xtty->end_elem();
507 }
508 nm->method()->clear_code();
509 nm->set_speculatively_disconnected(true);
510 }
511
512
513 void CodeCache::gc_prologue() {
514 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
515 }
516
517
518 void CodeCache::gc_epilogue() {
519 assert_locked_or_safepoint(CodeCache_lock);
520 FOR_ALL_ALIVE_BLOBS(cb) {
521 if (cb->is_nmethod()) {
522 nmethod *nm = (nmethod*)cb;
523 assert(!nm->is_unloaded(), "Tautology");
524 if (needs_cache_clean()) {
525 nm->cleanup_inline_caches();
526 }
527 DEBUG_ONLY(nm->verify());
528 nm->fix_oop_relocations();
529 }
530 }
531 set_needs_cache_clean(false);
532 prune_scavenge_root_nmethods();
533 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
534 }
535
536
537 address CodeCache::first_address() {
538 assert_locked_or_safepoint(CodeCache_lock);
539 return (address)_heap->begin();
540 }
541
542
543 address CodeCache::last_address() {
544 assert_locked_or_safepoint(CodeCache_lock);
545 return (address)_heap->end();
546 }
547
548
549 void icache_init();
550
551 void CodeCache::initialize() {
552 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
553 #ifdef COMPILER2
554 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
555 #endif
556 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
557 // This was originally just a check of the alignment, causing failure, instead, round
558 // the code cache to the page size. In particular, Solaris is moving to a larger
559 // default page size.
560 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
561 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
562 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
563 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
564 vm_exit_during_initialization("Could not reserve enough space for code cache");
565 }
566
567 MemoryService::add_code_heap_memory_pool(_heap);
568
569 // Initialize ICache flush mechanism
570 // This service is needed for os::register_code_area
571 icache_init();
572
573 // Give OS a chance to register generated code area.
574 // This is used on Windows 64 bit platforms to register
575 // Structured Exception Handlers for our generated code.
576 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
577 }
578
579
580 void codeCache_init() {
581 CodeCache::initialize();
582 }
583
584 //------------------------------------------------------------------------------------------------
585
586 int CodeCache::number_of_nmethods_with_dependencies() {
587 return _number_of_nmethods_with_dependencies;
588 }
589
590 void CodeCache::clear_inline_caches() {
591 assert_locked_or_safepoint(CodeCache_lock);
592 FOR_ALL_ALIVE_NMETHODS(nm) {
593 nm->clear_inline_caches();
594 }
595 }
596
597 #ifndef PRODUCT
598 // used to keep track of how much time is spent in mark_for_deoptimization
599 static elapsedTimer dependentCheckTime;
600 static int dependentCheckCount = 0;
601 #endif // PRODUCT
602
603
604 int CodeCache::mark_for_deoptimization(DepChange& changes) {
605 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
606
607 #ifndef PRODUCT
608 dependentCheckTime.start();
609 dependentCheckCount++;
610 #endif // PRODUCT
611
612 int number_of_marked_CodeBlobs = 0;
613
614 // search the hierarchy looking for nmethods which are affected by the loading of this class
615
616 // then search the interfaces this class implements looking for nmethods
617 // which might be dependent of the fact that an interface only had one
618 // implementor.
619
620 { No_Safepoint_Verifier nsv;
621 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
622 klassOop d = str.klass();
623 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes);
624 }
625 }
626
627 if (VerifyDependencies) {
628 // Turn off dependency tracing while actually testing deps.
629 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
630 FOR_ALL_ALIVE_NMETHODS(nm) {
631 if (!nm->is_marked_for_deoptimization() &&
632 nm->check_all_dependencies()) {
633 ResourceMark rm;
634 tty->print_cr("Should have been marked for deoptimization:");
635 changes.print();
636 nm->print();
637 nm->print_dependencies();
638 }
639 }
640 }
641
642 #ifndef PRODUCT
643 dependentCheckTime.stop();
644 #endif // PRODUCT
645
646 return number_of_marked_CodeBlobs;
647 }
648
649
650 #ifdef HOTSWAP
651 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
652 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
653 int number_of_marked_CodeBlobs = 0;
654
655 // Deoptimize all methods of the evolving class itself
656 objArrayOop old_methods = dependee->methods();
657 for (int i = 0; i < old_methods->length(); i++) {
658 ResourceMark rm;
659 methodOop old_method = (methodOop) old_methods->obj_at(i);
660 nmethod *nm = old_method->code();
661 if (nm != NULL) {
662 nm->mark_for_deoptimization();
663 number_of_marked_CodeBlobs++;
664 }
665 }
666
667 FOR_ALL_ALIVE_NMETHODS(nm) {
668 if (nm->is_marked_for_deoptimization()) {
669 // ...Already marked in the previous pass; don't count it again.
670 } else if (nm->is_evol_dependent_on(dependee())) {
671 ResourceMark rm;
672 nm->mark_for_deoptimization();
673 number_of_marked_CodeBlobs++;
674 } else {
675 // flush caches in case they refer to a redefined methodOop
676 nm->clear_inline_caches();
677 }
678 }
679
680 return number_of_marked_CodeBlobs;
681 }
682 #endif // HOTSWAP
683
684
685 // Deoptimize all methods
686 void CodeCache::mark_all_nmethods_for_deoptimization() {
687 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
688 FOR_ALL_ALIVE_NMETHODS(nm) {
689 nm->mark_for_deoptimization();
690 }
691 }
692
693
694 int CodeCache::mark_for_deoptimization(methodOop dependee) {
695 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
696 int number_of_marked_CodeBlobs = 0;
697
698 FOR_ALL_ALIVE_NMETHODS(nm) {
699 if (nm->is_dependent_on_method(dependee)) {
700 ResourceMark rm;
701 nm->mark_for_deoptimization();
702 number_of_marked_CodeBlobs++;
703 }
704 }
705
706 return number_of_marked_CodeBlobs;
707 }
708
709 void CodeCache::make_marked_nmethods_zombies() {
710 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
711 FOR_ALL_ALIVE_NMETHODS(nm) {
712 if (nm->is_marked_for_deoptimization()) {
713
714 // If the nmethod has already been made non-entrant and it can be converted
715 // then zombie it now. Otherwise make it non-entrant and it will eventually
716 // be zombied when it is no longer seen on the stack. Note that the nmethod
717 // might be "entrant" and not on the stack and so could be zombied immediately
718 // but we can't tell because we don't track it on stack until it becomes
719 // non-entrant.
720
721 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
722 nm->make_zombie();
723 } else {
724 nm->make_not_entrant();
725 }
726 }
727 }
728 }
729
730 void CodeCache::make_marked_nmethods_not_entrant() {
731 assert_locked_or_safepoint(CodeCache_lock);
732 FOR_ALL_ALIVE_NMETHODS(nm) {
733 if (nm->is_marked_for_deoptimization()) {
734 nm->make_not_entrant();
735 }
736 }
737 }
738
739 void CodeCache::verify() {
740 _heap->verify();
741 FOR_ALL_ALIVE_BLOBS(p) {
742 p->verify();
743 }
744 }
745
746 //------------------------------------------------------------------------------------------------
747 // Non-product version
748
749 #ifndef PRODUCT
750
751 void CodeCache::verify_if_often() {
752 if (VerifyCodeCacheOften) {
753 _heap->verify();
754 }
755 }
756
757 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
758 if (PrintCodeCache2) { // Need to add a new flag
759 ResourceMark rm;
760 if (size == 0) size = cb->size();
761 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
762 }
763 }
764
765 void CodeCache::print_internals() {
766 int nmethodCount = 0;
767 int runtimeStubCount = 0;
768 int adapterCount = 0;
769 int deoptimizationStubCount = 0;
770 int uncommonTrapStubCount = 0;
771 int bufferBlobCount = 0;
772 int total = 0;
773 int nmethodAlive = 0;
774 int nmethodNotEntrant = 0;
775 int nmethodZombie = 0;
776 int nmethodUnloaded = 0;
777 int nmethodJava = 0;
778 int nmethodNative = 0;
779 int maxCodeSize = 0;
780 ResourceMark rm;
781
782 CodeBlob *cb;
783 for (cb = first(); cb != NULL; cb = next(cb)) {
784 total++;
785 if (cb->is_nmethod()) {
786 nmethod* nm = (nmethod*)cb;
787
788 if (Verbose && nm->method() != NULL) {
789 ResourceMark rm;
790 char *method_name = nm->method()->name_and_sig_as_C_string();
791 tty->print("%s", method_name);
792 if(nm->is_alive()) { tty->print_cr(" alive"); }
793 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
794 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
795 }
796
797 nmethodCount++;
798
799 if(nm->is_alive()) { nmethodAlive++; }
800 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
801 if(nm->is_zombie()) { nmethodZombie++; }
802 if(nm->is_unloaded()) { nmethodUnloaded++; }
803 if(nm->is_native_method()) { nmethodNative++; }
804
805 if(nm->method() != NULL && nm->is_java_method()) {
806 nmethodJava++;
807 if (nm->insts_size() > maxCodeSize) {
808 maxCodeSize = nm->insts_size();
809 }
810 }
811 } else if (cb->is_runtime_stub()) {
812 runtimeStubCount++;
813 } else if (cb->is_deoptimization_stub()) {
814 deoptimizationStubCount++;
815 } else if (cb->is_uncommon_trap_stub()) {
816 uncommonTrapStubCount++;
817 } else if (cb->is_adapter_blob()) {
818 adapterCount++;
819 } else if (cb->is_buffer_blob()) {
820 bufferBlobCount++;
821 }
822 }
823
824 int bucketSize = 512;
825 int bucketLimit = maxCodeSize / bucketSize + 1;
826 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit);
827 memset(buckets,0,sizeof(int) * bucketLimit);
828
829 for (cb = first(); cb != NULL; cb = next(cb)) {
830 if (cb->is_nmethod()) {
831 nmethod* nm = (nmethod*)cb;
832 if(nm->is_java_method()) {
833 buckets[nm->insts_size() / bucketSize]++;
834 }
835 }
836 }
837 tty->print_cr("Code Cache Entries (total of %d)",total);
838 tty->print_cr("-------------------------------------------------");
839 tty->print_cr("nmethods: %d",nmethodCount);
840 tty->print_cr("\talive: %d",nmethodAlive);
841 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
842 tty->print_cr("\tzombie: %d",nmethodZombie);
843 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
844 tty->print_cr("\tjava: %d",nmethodJava);
845 tty->print_cr("\tnative: %d",nmethodNative);
846 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
847 tty->print_cr("adapters: %d",adapterCount);
848 tty->print_cr("buffer blobs: %d",bufferBlobCount);
849 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
850 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
851 tty->print_cr("\nnmethod size distribution (non-zombie java)");
852 tty->print_cr("-------------------------------------------------");
853
854 for(int i=0; i<bucketLimit; i++) {
855 if(buckets[i] != 0) {
856 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
857 tty->fill_to(40);
858 tty->print_cr("%d",buckets[i]);
859 }
860 }
861
862 FREE_C_HEAP_ARRAY(int, buckets);
863 }
864
865 void CodeCache::print() {
866 CodeBlob_sizes live;
867 CodeBlob_sizes dead;
868
869 FOR_ALL_BLOBS(p) {
870 if (!p->is_alive()) {
871 dead.add(p);
872 } else {
873 live.add(p);
874 }
875 }
876
877 tty->print_cr("CodeCache:");
878
879 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),
880 dependentCheckTime.seconds() / dependentCheckCount);
881
882 if (!live.is_empty()) {
883 live.print("live");
884 }
885 if (!dead.is_empty()) {
886 dead.print("dead");
887 }
888
889
890 if (Verbose) {
891 // print the oop_map usage
892 int code_size = 0;
893 int number_of_blobs = 0;
894 int number_of_oop_maps = 0;
895 int map_size = 0;
896 FOR_ALL_BLOBS(p) {
897 if (p->is_alive()) {
898 number_of_blobs++;
899 code_size += p->code_size();
900 OopMapSet* set = p->oop_maps();
901 if (set != NULL) {
902 number_of_oop_maps += set->size();
903 map_size += set->heap_size();
904 }
905 }
906 }
907 tty->print_cr("OopMaps");
908 tty->print_cr(" #blobs = %d", number_of_blobs);
909 tty->print_cr(" code size = %d", code_size);
910 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
911 tty->print_cr(" map size = %d", map_size);
912 }
913
914 }
915
916 #endif // PRODUCT