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 "precompiled.hpp"
26 #include "code/codeBlob.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nmethod.hpp"
30 #include "code/pcDesc.hpp"
31 #include "gc_implementation/shared/markSweep.hpp"
32 #include "memory/allocation.inline.hpp"
33 #include "memory/gcLocker.hpp"
34 #include "memory/iterator.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/methodOop.hpp"
37 #include "oops/objArrayOop.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "runtime/handles.inline.hpp"
40 #include "runtime/icache.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/mutexLocker.hpp"
43 #include "services/memoryService.hpp"
44 #include "utilities/xmlstream.hpp"
45
46 // Helper class for printing in CodeCache
47
48 class CodeBlob_sizes {
49 private:
50 int count;
51 int total_size;
52 int header_size;
53 int code_size;
54 int stub_size;
55 int relocation_size;
56 int scopes_oop_size;
57 int scopes_data_size;
58 int scopes_pcs_size;
59
60 public:
61 CodeBlob_sizes() {
62 count = 0;
63 total_size = 0;
64 header_size = 0;
65 code_size = 0;
66 stub_size = 0;
67 relocation_size = 0;
68 scopes_oop_size = 0;
69 scopes_data_size = 0;
70 scopes_pcs_size = 0;
71 }
72
73 int total() { return total_size; }
74 bool is_empty() { return count == 0; }
75
76 void print(const char* title) {
77 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])",
78 count,
79 title,
80 total() / K,
81 header_size * 100 / total_size,
82 relocation_size * 100 / total_size,
83 code_size * 100 / total_size,
84 stub_size * 100 / total_size,
85 scopes_oop_size * 100 / total_size,
86 scopes_data_size * 100 / total_size,
87 scopes_pcs_size * 100 / total_size);
88 }
89
90 void add(CodeBlob* cb) {
91 count++;
92 total_size += cb->size();
93 header_size += cb->header_size();
94 relocation_size += cb->relocation_size();
95 if (cb->is_nmethod()) {
96 nmethod* nm = cb->as_nmethod_or_null();
97 code_size += nm->insts_size();
98 stub_size += nm->stub_size();
99
100 scopes_oop_size += nm->oops_size();
101 scopes_data_size += nm->scopes_data_size();
102 scopes_pcs_size += nm->scopes_pcs_size();
103 } else {
104 code_size += cb->code_size();
105 }
106 }
107 };
108
109
110 // CodeCache implementation
111
112 CodeHeap * CodeCache::_heap = new CodeHeap();
113 int CodeCache::_number_of_blobs = 0;
114 int CodeCache::_number_of_adapters = 0;
115 int CodeCache::_number_of_nmethods = 0;
116 int CodeCache::_number_of_nmethods_with_dependencies = 0;
117 bool CodeCache::_needs_cache_clean = false;
118 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
119 nmethod* CodeCache::_saved_nmethods = NULL;
120
121
122 CodeBlob* CodeCache::first() {
123 assert_locked_or_safepoint(CodeCache_lock);
124 return (CodeBlob*)_heap->first();
125 }
126
127
128 CodeBlob* CodeCache::next(CodeBlob* cb) {
129 assert_locked_or_safepoint(CodeCache_lock);
130 return (CodeBlob*)_heap->next(cb);
131 }
132
133
134 CodeBlob* CodeCache::alive(CodeBlob *cb) {
135 assert_locked_or_safepoint(CodeCache_lock);
136 while (cb != NULL && !cb->is_alive()) cb = next(cb);
137 return cb;
138 }
139
140
141 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
142 assert_locked_or_safepoint(CodeCache_lock);
143 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
144 return (nmethod*)cb;
145 }
146
147 nmethod* CodeCache::first_nmethod() {
148 assert_locked_or_safepoint(CodeCache_lock);
149 CodeBlob* cb = first();
150 while (cb != NULL && !cb->is_nmethod()) {
151 cb = next(cb);
152 }
153 return (nmethod*)cb;
154 }
155
156 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
157 assert_locked_or_safepoint(CodeCache_lock);
158 cb = next(cb);
159 while (cb != NULL && !cb->is_nmethod()) {
160 cb = next(cb);
161 }
162 return (nmethod*)cb;
163 }
164
165 CodeBlob* CodeCache::allocate(int size) {
166 // Do not seize the CodeCache lock here--if the caller has not
167 // already done so, we are going to lose bigtime, since the code
168 // cache will contain a garbage CodeBlob until the caller can
169 // run the constructor for the CodeBlob subclass he is busy
170 // instantiating.
171 guarantee(size >= 0, "allocation request must be reasonable");
172 assert_locked_or_safepoint(CodeCache_lock);
173 CodeBlob* cb = NULL;
174 _number_of_blobs++;
175 while (true) {
176 cb = (CodeBlob*)_heap->allocate(size);
177 if (cb != NULL) break;
178 if (!_heap->expand_by(CodeCacheExpansionSize)) {
179 // Expansion failed
180 return NULL;
181 }
182 if (PrintCodeCacheExtension) {
183 ResourceMark rm;
184 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
185 (intptr_t)_heap->begin(), (intptr_t)_heap->end(),
186 (address)_heap->end() - (address)_heap->begin());
187 }
188 }
189 verify_if_often();
190 print_trace("allocation", cb, size);
191 return cb;
192 }
193
194 void CodeCache::free(CodeBlob* cb) {
195 assert_locked_or_safepoint(CodeCache_lock);
196 verify_if_often();
197
198 print_trace("free", cb);
199 if (cb->is_nmethod()) {
200 _number_of_nmethods--;
201 if (((nmethod *)cb)->has_dependencies()) {
202 _number_of_nmethods_with_dependencies--;
203 }
204 }
205 if (cb->is_adapter_blob()) {
206 _number_of_adapters--;
207 }
208 _number_of_blobs--;
209
210 _heap->deallocate(cb);
211
212 verify_if_often();
213 assert(_number_of_blobs >= 0, "sanity check");
214 }
215
216
217 void CodeCache::commit(CodeBlob* cb) {
218 // this is called by nmethod::nmethod, which must already own CodeCache_lock
219 assert_locked_or_safepoint(CodeCache_lock);
220 if (cb->is_nmethod()) {
221 _number_of_nmethods++;
222 if (((nmethod *)cb)->has_dependencies()) {
223 _number_of_nmethods_with_dependencies++;
224 }
225 }
226 if (cb->is_adapter_blob()) {
227 _number_of_adapters++;
228 }
229
230 // flush the hardware I-cache
231 ICache::invalidate_range(cb->content_begin(), cb->content_size());
232 }
233
234
235 void CodeCache::flush() {
236 assert_locked_or_safepoint(CodeCache_lock);
237 Unimplemented();
238 }
239
240
241 // Iteration over CodeBlobs
242
243 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) )
244 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
245 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
246
247
248 bool CodeCache::contains(void *p) {
249 // It should be ok to call contains without holding a lock
250 return _heap->contains(p);
251 }
252
253
254 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
255 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
256 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
257 CodeBlob* CodeCache::find_blob(void* start) {
258 CodeBlob* result = find_blob_unsafe(start);
259 if (result == NULL) return NULL;
260 // We could potientially look up non_entrant methods
261 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
262 return result;
263 }
264
265 nmethod* CodeCache::find_nmethod(void* start) {
266 CodeBlob *cb = find_blob(start);
267 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
268 return (nmethod*)cb;
269 }
270
271
272 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
273 assert_locked_or_safepoint(CodeCache_lock);
274 FOR_ALL_BLOBS(p) {
275 f(p);
276 }
277 }
278
279
280 void CodeCache::nmethods_do(void f(nmethod* nm)) {
281 assert_locked_or_safepoint(CodeCache_lock);
282 FOR_ALL_BLOBS(nm) {
283 if (nm->is_nmethod()) f((nmethod*)nm);
284 }
285 }
286
287
288 int CodeCache::alignment_unit() {
289 return (int)_heap->alignment_unit();
290 }
291
292
293 int CodeCache::alignment_offset() {
294 return (int)_heap->alignment_offset();
295 }
296
297
298 // Mark nmethods for unloading if they contain otherwise unreachable
299 // oops.
300 void CodeCache::do_unloading(BoolObjectClosure* is_alive,
301 OopClosure* keep_alive,
302 bool unloading_occurred) {
303 assert_locked_or_safepoint(CodeCache_lock);
304 FOR_ALL_ALIVE_NMETHODS(nm) {
305 nm->do_unloading(is_alive, keep_alive, unloading_occurred);
306 }
307 }
308
309 void CodeCache::blobs_do(CodeBlobClosure* f) {
310 assert_locked_or_safepoint(CodeCache_lock);
311 FOR_ALL_ALIVE_BLOBS(cb) {
312 f->do_code_blob(cb);
313
314 #ifdef ASSERT
315 if (cb->is_nmethod())
316 ((nmethod*)cb)->verify_scavenge_root_oops();
317 #endif //ASSERT
318 }
319 }
320
321 // Walk the list of methods which might contain non-perm oops.
322 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
323 assert_locked_or_safepoint(CodeCache_lock);
324 debug_only(mark_scavenge_root_nmethods());
325
326 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
327 debug_only(cur->clear_scavenge_root_marked());
328 assert(cur->scavenge_root_not_marked(), "");
329 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
330
331 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
332 #ifndef PRODUCT
333 if (TraceScavenge) {
334 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
335 }
336 #endif //PRODUCT
337 if (is_live) {
338 // Perform cur->oops_do(f), maybe just once per nmethod.
339 f->do_code_blob(cur);
340 cur->fix_oop_relocations();
341 }
342 }
343
344 // Check for stray marks.
345 debug_only(verify_perm_nmethods(NULL));
346 }
347
348 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
349 assert_locked_or_safepoint(CodeCache_lock);
350 nm->set_on_scavenge_root_list();
351 nm->set_scavenge_root_link(_scavenge_root_nmethods);
352 set_scavenge_root_nmethods(nm);
353 print_trace("add_scavenge_root", nm);
354 }
355
356 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
357 assert_locked_or_safepoint(CodeCache_lock);
358 print_trace("drop_scavenge_root", nm);
359 nmethod* last = NULL;
360 nmethod* cur = scavenge_root_nmethods();
361 while (cur != NULL) {
362 nmethod* next = cur->scavenge_root_link();
363 if (cur == nm) {
364 if (last != NULL)
365 last->set_scavenge_root_link(next);
366 else set_scavenge_root_nmethods(next);
367 nm->set_scavenge_root_link(NULL);
368 nm->clear_on_scavenge_root_list();
369 return;
370 }
371 last = cur;
372 cur = next;
373 }
374 assert(false, "should have been on list");
375 }
376
377 void CodeCache::prune_scavenge_root_nmethods() {
378 assert_locked_or_safepoint(CodeCache_lock);
379 debug_only(mark_scavenge_root_nmethods());
380
381 nmethod* last = NULL;
382 nmethod* cur = scavenge_root_nmethods();
383 while (cur != NULL) {
384 nmethod* next = cur->scavenge_root_link();
385 debug_only(cur->clear_scavenge_root_marked());
386 assert(cur->scavenge_root_not_marked(), "");
387 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
388
389 if (!cur->is_zombie() && !cur->is_unloaded()
390 && cur->detect_scavenge_root_oops()) {
391 // Keep it. Advance 'last' to prevent deletion.
392 last = cur;
393 } else {
394 // Prune it from the list, so we don't have to look at it any more.
395 print_trace("prune_scavenge_root", cur);
396 cur->set_scavenge_root_link(NULL);
397 cur->clear_on_scavenge_root_list();
398 if (last != NULL)
399 last->set_scavenge_root_link(next);
400 else set_scavenge_root_nmethods(next);
401 }
402 cur = next;
403 }
404
405 // Check for stray marks.
406 debug_only(verify_perm_nmethods(NULL));
407 }
408
409 #ifndef PRODUCT
410 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
411 // While we are here, verify the integrity of the list.
412 mark_scavenge_root_nmethods();
413 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
414 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
415 cur->clear_scavenge_root_marked();
416 }
417 verify_perm_nmethods(f);
418 }
419
420 // Temporarily mark nmethods that are claimed to be on the non-perm list.
421 void CodeCache::mark_scavenge_root_nmethods() {
422 FOR_ALL_ALIVE_BLOBS(cb) {
423 if (cb->is_nmethod()) {
424 nmethod *nm = (nmethod*)cb;
425 assert(nm->scavenge_root_not_marked(), "clean state");
426 if (nm->on_scavenge_root_list())
427 nm->set_scavenge_root_marked();
428 }
429 }
430 }
431
432 // If the closure is given, run it on the unlisted nmethods.
433 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
434 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
435 FOR_ALL_ALIVE_BLOBS(cb) {
436 bool call_f = (f_or_null != NULL);
437 if (cb->is_nmethod()) {
438 nmethod *nm = (nmethod*)cb;
439 assert(nm->scavenge_root_not_marked(), "must be already processed");
440 if (nm->on_scavenge_root_list())
441 call_f = false; // don't show this one to the client
442 nm->verify_scavenge_root_oops();
443 } else {
444 call_f = false; // not an nmethod
445 }
446 if (call_f) f_or_null->do_code_blob(cb);
447 }
448 }
449 #endif //PRODUCT
450
451
452 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) {
453 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
454 nmethod* saved = _saved_nmethods;
455 nmethod* prev = NULL;
456 while (saved != NULL) {
457 if (saved->is_in_use() && saved->method() == m) {
458 if (prev != NULL) {
459 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
460 } else {
461 _saved_nmethods = saved->saved_nmethod_link();
462 }
463 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
464 saved->set_speculatively_disconnected(false);
465 saved->set_saved_nmethod_link(NULL);
466 if (PrintMethodFlushing) {
467 saved->print_on(tty, " ### nmethod is reconnected\n");
468 }
469 if (LogCompilation && (xtty != NULL)) {
470 ttyLocker ttyl;
471 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
472 xtty->method(methodOop(m));
473 xtty->stamp();
474 xtty->end_elem();
475 }
476 return saved;
477 }
478 prev = saved;
479 saved = saved->saved_nmethod_link();
480 }
481 return NULL;
482 }
483
484 void CodeCache::remove_saved_code(nmethod* nm) {
485 // For conc swpr this will be called with CodeCache_lock taken by caller
486 assert_locked_or_safepoint(CodeCache_lock);
487 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
488 nmethod* saved = _saved_nmethods;
489 nmethod* prev = NULL;
490 while (saved != NULL) {
491 if (saved == nm) {
492 if (prev != NULL) {
493 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
494 } else {
495 _saved_nmethods = saved->saved_nmethod_link();
496 }
497 if (LogCompilation && (xtty != NULL)) {
498 ttyLocker ttyl;
499 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
500 xtty->stamp();
501 xtty->end_elem();
502 }
503 return;
504 }
505 prev = saved;
506 saved = saved->saved_nmethod_link();
507 }
508 ShouldNotReachHere();
509 }
510
511 void CodeCache::speculatively_disconnect(nmethod* nm) {
512 assert_locked_or_safepoint(CodeCache_lock);
513 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
514 nm->set_saved_nmethod_link(_saved_nmethods);
515 _saved_nmethods = nm;
516 if (PrintMethodFlushing) {
517 nm->print_on(tty, " ### nmethod is speculatively disconnected\n");
518 }
519 if (LogCompilation && (xtty != NULL)) {
520 ttyLocker ttyl;
521 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
522 xtty->method(methodOop(nm->method()));
523 xtty->stamp();
524 xtty->end_elem();
525 }
526 nm->method()->clear_code();
527 nm->set_speculatively_disconnected(true);
528 }
529
530
531 void CodeCache::gc_prologue() {
532 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
533 }
534
535
536 void CodeCache::gc_epilogue() {
537 assert_locked_or_safepoint(CodeCache_lock);
538 FOR_ALL_ALIVE_BLOBS(cb) {
539 if (cb->is_nmethod()) {
540 nmethod *nm = (nmethod*)cb;
541 assert(!nm->is_unloaded(), "Tautology");
542 if (needs_cache_clean()) {
543 nm->cleanup_inline_caches();
544 }
545 DEBUG_ONLY(nm->verify());
546 nm->fix_oop_relocations();
547 }
548 }
549 set_needs_cache_clean(false);
550 prune_scavenge_root_nmethods();
551 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
552 }
553
554
555 address CodeCache::first_address() {
556 assert_locked_or_safepoint(CodeCache_lock);
557 return (address)_heap->begin();
558 }
559
560
561 address CodeCache::last_address() {
562 assert_locked_or_safepoint(CodeCache_lock);
563 return (address)_heap->end();
564 }
565
566
567 void icache_init();
568
569 void CodeCache::initialize() {
570 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
571 #ifdef COMPILER2
572 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
573 #endif
574 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
575 // This was originally just a check of the alignment, causing failure, instead, round
576 // the code cache to the page size. In particular, Solaris is moving to a larger
577 // default page size.
578 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
579 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
580 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
581 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
582 vm_exit_during_initialization("Could not reserve enough space for code cache");
583 }
584
585 MemoryService::add_code_heap_memory_pool(_heap);
586
587 // Initialize ICache flush mechanism
588 // This service is needed for os::register_code_area
589 icache_init();
590
591 // Give OS a chance to register generated code area.
592 // This is used on Windows 64 bit platforms to register
593 // Structured Exception Handlers for our generated code.
594 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
595 }
596
597
598 void codeCache_init() {
599 CodeCache::initialize();
600 }
601
602 //------------------------------------------------------------------------------------------------
603
604 int CodeCache::number_of_nmethods_with_dependencies() {
605 return _number_of_nmethods_with_dependencies;
606 }
607
608 void CodeCache::clear_inline_caches() {
609 assert_locked_or_safepoint(CodeCache_lock);
610 FOR_ALL_ALIVE_NMETHODS(nm) {
611 nm->clear_inline_caches();
612 }
613 }
614
615 #ifndef PRODUCT
616 // used to keep track of how much time is spent in mark_for_deoptimization
617 static elapsedTimer dependentCheckTime;
618 static int dependentCheckCount = 0;
619 #endif // PRODUCT
620
621
622 int CodeCache::mark_for_deoptimization(DepChange& changes) {
623 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
624
625 #ifndef PRODUCT
626 dependentCheckTime.start();
627 dependentCheckCount++;
628 #endif // PRODUCT
629
630 int number_of_marked_CodeBlobs = 0;
631
632 // search the hierarchy looking for nmethods which are affected by the loading of this class
633
634 // then search the interfaces this class implements looking for nmethods
635 // which might be dependent of the fact that an interface only had one
636 // implementor.
637
638 { No_Safepoint_Verifier nsv;
639 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
640 klassOop d = str.klass();
641 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes);
642 }
643 }
644
645 if (VerifyDependencies) {
646 // Turn off dependency tracing while actually testing deps.
647 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
648 FOR_ALL_ALIVE_NMETHODS(nm) {
649 if (!nm->is_marked_for_deoptimization() &&
650 nm->check_all_dependencies()) {
651 ResourceMark rm;
652 tty->print_cr("Should have been marked for deoptimization:");
653 changes.print();
654 nm->print();
655 nm->print_dependencies();
656 }
657 }
658 }
659
660 #ifndef PRODUCT
661 dependentCheckTime.stop();
662 #endif // PRODUCT
663
664 return number_of_marked_CodeBlobs;
665 }
666
667
668 #ifdef HOTSWAP
669 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
670 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
671 int number_of_marked_CodeBlobs = 0;
672
673 // Deoptimize all methods of the evolving class itself
674 objArrayOop old_methods = dependee->methods();
675 for (int i = 0; i < old_methods->length(); i++) {
676 ResourceMark rm;
677 methodOop old_method = (methodOop) old_methods->obj_at(i);
678 nmethod *nm = old_method->code();
679 if (nm != NULL) {
680 nm->mark_for_deoptimization();
681 number_of_marked_CodeBlobs++;
682 }
683 }
684
685 FOR_ALL_ALIVE_NMETHODS(nm) {
686 if (nm->is_marked_for_deoptimization()) {
687 // ...Already marked in the previous pass; don't count it again.
688 } else if (nm->is_evol_dependent_on(dependee())) {
689 ResourceMark rm;
690 nm->mark_for_deoptimization();
691 number_of_marked_CodeBlobs++;
692 } else {
693 // flush caches in case they refer to a redefined methodOop
694 nm->clear_inline_caches();
695 }
696 }
697
698 return number_of_marked_CodeBlobs;
699 }
700 #endif // HOTSWAP
701
702
703 // Deoptimize all methods
704 void CodeCache::mark_all_nmethods_for_deoptimization() {
705 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
706 FOR_ALL_ALIVE_NMETHODS(nm) {
707 nm->mark_for_deoptimization();
708 }
709 }
710
711
712 int CodeCache::mark_for_deoptimization(methodOop dependee) {
713 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
714 int number_of_marked_CodeBlobs = 0;
715
716 FOR_ALL_ALIVE_NMETHODS(nm) {
717 if (nm->is_dependent_on_method(dependee)) {
718 ResourceMark rm;
719 nm->mark_for_deoptimization();
720 number_of_marked_CodeBlobs++;
721 }
722 }
723
724 return number_of_marked_CodeBlobs;
725 }
726
727 void CodeCache::make_marked_nmethods_zombies() {
728 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
729 FOR_ALL_ALIVE_NMETHODS(nm) {
730 if (nm->is_marked_for_deoptimization()) {
731
732 // If the nmethod has already been made non-entrant and it can be converted
733 // then zombie it now. Otherwise make it non-entrant and it will eventually
734 // be zombied when it is no longer seen on the stack. Note that the nmethod
735 // might be "entrant" and not on the stack and so could be zombied immediately
736 // but we can't tell because we don't track it on stack until it becomes
737 // non-entrant.
738
739 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
740 nm->make_zombie();
741 } else {
742 nm->make_not_entrant();
743 }
744 }
745 }
746 }
747
748 void CodeCache::make_marked_nmethods_not_entrant() {
749 assert_locked_or_safepoint(CodeCache_lock);
750 FOR_ALL_ALIVE_NMETHODS(nm) {
751 if (nm->is_marked_for_deoptimization()) {
752 nm->make_not_entrant();
753 }
754 }
755 }
756
757 void CodeCache::verify() {
758 _heap->verify();
759 FOR_ALL_ALIVE_BLOBS(p) {
760 p->verify();
761 }
762 }
763
764 //------------------------------------------------------------------------------------------------
765 // Non-product version
766
767 #ifndef PRODUCT
768
769 void CodeCache::verify_if_often() {
770 if (VerifyCodeCacheOften) {
771 _heap->verify();
772 }
773 }
774
775 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
776 if (PrintCodeCache2) { // Need to add a new flag
777 ResourceMark rm;
778 if (size == 0) size = cb->size();
779 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
780 }
781 }
782
783 void CodeCache::print_internals() {
784 int nmethodCount = 0;
785 int runtimeStubCount = 0;
786 int adapterCount = 0;
787 int deoptimizationStubCount = 0;
788 int uncommonTrapStubCount = 0;
789 int bufferBlobCount = 0;
790 int total = 0;
791 int nmethodAlive = 0;
792 int nmethodNotEntrant = 0;
793 int nmethodZombie = 0;
794 int nmethodUnloaded = 0;
795 int nmethodJava = 0;
796 int nmethodNative = 0;
797 int maxCodeSize = 0;
798 ResourceMark rm;
799
800 CodeBlob *cb;
801 for (cb = first(); cb != NULL; cb = next(cb)) {
802 total++;
803 if (cb->is_nmethod()) {
804 nmethod* nm = (nmethod*)cb;
805
806 if (Verbose && nm->method() != NULL) {
807 ResourceMark rm;
808 char *method_name = nm->method()->name_and_sig_as_C_string();
809 tty->print("%s", method_name);
810 if(nm->is_alive()) { tty->print_cr(" alive"); }
811 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
812 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
813 }
814
815 nmethodCount++;
816
817 if(nm->is_alive()) { nmethodAlive++; }
818 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
819 if(nm->is_zombie()) { nmethodZombie++; }
820 if(nm->is_unloaded()) { nmethodUnloaded++; }
821 if(nm->is_native_method()) { nmethodNative++; }
822
823 if(nm->method() != NULL && nm->is_java_method()) {
824 nmethodJava++;
825 if (nm->insts_size() > maxCodeSize) {
826 maxCodeSize = nm->insts_size();
827 }
828 }
829 } else if (cb->is_runtime_stub()) {
830 runtimeStubCount++;
831 } else if (cb->is_deoptimization_stub()) {
832 deoptimizationStubCount++;
833 } else if (cb->is_uncommon_trap_stub()) {
834 uncommonTrapStubCount++;
835 } else if (cb->is_adapter_blob()) {
836 adapterCount++;
837 } else if (cb->is_buffer_blob()) {
838 bufferBlobCount++;
839 }
840 }
841
842 int bucketSize = 512;
843 int bucketLimit = maxCodeSize / bucketSize + 1;
844 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit);
845 memset(buckets,0,sizeof(int) * bucketLimit);
846
847 for (cb = first(); cb != NULL; cb = next(cb)) {
848 if (cb->is_nmethod()) {
849 nmethod* nm = (nmethod*)cb;
850 if(nm->is_java_method()) {
851 buckets[nm->insts_size() / bucketSize]++;
852 }
853 }
854 }
855 tty->print_cr("Code Cache Entries (total of %d)",total);
856 tty->print_cr("-------------------------------------------------");
857 tty->print_cr("nmethods: %d",nmethodCount);
858 tty->print_cr("\talive: %d",nmethodAlive);
859 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
860 tty->print_cr("\tzombie: %d",nmethodZombie);
861 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
862 tty->print_cr("\tjava: %d",nmethodJava);
863 tty->print_cr("\tnative: %d",nmethodNative);
864 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
865 tty->print_cr("adapters: %d",adapterCount);
866 tty->print_cr("buffer blobs: %d",bufferBlobCount);
867 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
868 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
869 tty->print_cr("\nnmethod size distribution (non-zombie java)");
870 tty->print_cr("-------------------------------------------------");
871
872 for(int i=0; i<bucketLimit; i++) {
873 if(buckets[i] != 0) {
874 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
875 tty->fill_to(40);
876 tty->print_cr("%d",buckets[i]);
877 }
878 }
879
880 FREE_C_HEAP_ARRAY(int, buckets);
881 }
882
883 void CodeCache::print() {
884 CodeBlob_sizes live;
885 CodeBlob_sizes dead;
886
887 FOR_ALL_BLOBS(p) {
888 if (!p->is_alive()) {
889 dead.add(p);
890 } else {
891 live.add(p);
892 }
893 }
894
895 tty->print_cr("CodeCache:");
896
897 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),
898 dependentCheckTime.seconds() / dependentCheckCount);
899
900 if (!live.is_empty()) {
901 live.print("live");
902 }
903 if (!dead.is_empty()) {
904 dead.print("dead");
905 }
906
907
908 if (Verbose) {
909 // print the oop_map usage
910 int code_size = 0;
911 int number_of_blobs = 0;
912 int number_of_oop_maps = 0;
913 int map_size = 0;
914 FOR_ALL_BLOBS(p) {
915 if (p->is_alive()) {
916 number_of_blobs++;
917 code_size += p->code_size();
918 OopMapSet* set = p->oop_maps();
919 if (set != NULL) {
920 number_of_oop_maps += set->size();
921 map_size += set->heap_size();
922 }
923 }
924 }
925 tty->print_cr("OopMaps");
926 tty->print_cr(" #blobs = %d", number_of_blobs);
927 tty->print_cr(" code size = %d", code_size);
928 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
929 tty->print_cr(" map size = %d", map_size);
930 }
931
932 }
933
934 #endif // PRODUCT