1 /*
2 * Copyright (c) 1997, 2014, 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/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/nmethod.hpp"
32 #include "code/pcDesc.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "gc_implementation/shared/markSweep.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/gcLocker.hpp"
37 #include "memory/iterator.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "oops/method.hpp"
40 #include "oops/objArrayOop.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "runtime/handles.inline.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/icache.hpp"
45 #include "runtime/java.hpp"
46 #include "runtime/mutexLocker.hpp"
47 #include "services/memoryService.hpp"
48 #include "trace/tracing.hpp"
49 #include "utilities/xmlstream.hpp"
50
51 // Helper class for printing in CodeCache
52
53 class CodeBlob_sizes {
54 private:
55 int count;
56 int total_size;
57 int header_size;
58 int code_size;
59 int stub_size;
60 int relocation_size;
61 int scopes_oop_size;
62 int scopes_metadata_size;
63 int scopes_data_size;
64 int scopes_pcs_size;
65
66 public:
67 CodeBlob_sizes() {
68 count = 0;
69 total_size = 0;
70 header_size = 0;
71 code_size = 0;
72 stub_size = 0;
73 relocation_size = 0;
74 scopes_oop_size = 0;
75 scopes_metadata_size = 0;
76 scopes_data_size = 0;
77 scopes_pcs_size = 0;
78 }
79
80 int total() { return total_size; }
81 bool is_empty() { return count == 0; }
82
83 void print(const char* title) {
84 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, metadata %d%%, data %d%%, pcs %d%%])",
85 count,
86 title,
87 (int)(total() / K),
88 header_size * 100 / total_size,
89 relocation_size * 100 / total_size,
90 code_size * 100 / total_size,
91 stub_size * 100 / total_size,
92 scopes_oop_size * 100 / total_size,
93 scopes_metadata_size * 100 / total_size,
94 scopes_data_size * 100 / total_size,
95 scopes_pcs_size * 100 / total_size);
96 }
97
98 void add(CodeBlob* cb) {
99 count++;
100 total_size += cb->size();
101 header_size += cb->header_size();
102 relocation_size += cb->relocation_size();
103 if (cb->is_nmethod()) {
104 nmethod* nm = cb->as_nmethod_or_null();
105 code_size += nm->insts_size();
106 stub_size += nm->stub_size();
107
108 scopes_oop_size += nm->oops_size();
109 scopes_metadata_size += nm->metadata_size();
110 scopes_data_size += nm->scopes_data_size();
111 scopes_pcs_size += nm->scopes_pcs_size();
112 } else {
113 code_size += cb->code_size();
114 }
115 }
116 };
117
118 // CodeCache implementation
119
120 CodeHeap * CodeCache::_heap = new CodeHeap();
121 int CodeCache::_number_of_blobs = 0;
122 int CodeCache::_number_of_adapters = 0;
123 int CodeCache::_number_of_nmethods = 0;
124 int CodeCache::_number_of_nmethods_with_dependencies = 0;
125 bool CodeCache::_needs_cache_clean = false;
126 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
127
128 int CodeCache::_codemem_full_count = 0;
129
130 CodeBlob* CodeCache::first() {
131 assert_locked_or_safepoint(CodeCache_lock);
132 return (CodeBlob*)_heap->first();
133 }
134
135
136 CodeBlob* CodeCache::next(CodeBlob* cb) {
137 assert_locked_or_safepoint(CodeCache_lock);
138 return (CodeBlob*)_heap->next(cb);
139 }
140
141
142 CodeBlob* CodeCache::alive(CodeBlob *cb) {
143 assert_locked_or_safepoint(CodeCache_lock);
144 while (cb != NULL && !cb->is_alive()) cb = next(cb);
145 return cb;
146 }
147
148
149 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
150 assert_locked_or_safepoint(CodeCache_lock);
151 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
152 return (nmethod*)cb;
153 }
154
155 nmethod* CodeCache::first_nmethod() {
156 assert_locked_or_safepoint(CodeCache_lock);
157 CodeBlob* cb = first();
158 while (cb != NULL && !cb->is_nmethod()) {
159 cb = next(cb);
160 }
161 return (nmethod*)cb;
162 }
163
164 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
165 assert_locked_or_safepoint(CodeCache_lock);
166 cb = next(cb);
167 while (cb != NULL && !cb->is_nmethod()) {
168 cb = next(cb);
169 }
170 return (nmethod*)cb;
171 }
172
173 static size_t maxCodeCacheUsed = 0;
174
175 CodeBlob* CodeCache::allocate(int size, bool is_critical) {
176 // Do not seize the CodeCache lock here--if the caller has not
177 // already done so, we are going to lose bigtime, since the code
178 // cache will contain a garbage CodeBlob until the caller can
179 // run the constructor for the CodeBlob subclass he is busy
180 // instantiating.
181 assert_locked_or_safepoint(CodeCache_lock);
182 assert(size > 0, "allocation request must be reasonable");
183 if (size <= 0) {
184 return NULL;
185 }
186 CodeBlob* cb = NULL;
187 while (true) {
188 cb = (CodeBlob*)_heap->allocate(size, is_critical);
189 if (cb != NULL) break;
190 if (!_heap->expand_by(CodeCacheExpansionSize)) {
191 // Expansion failed
192 return NULL;
193 }
194 if (PrintCodeCacheExtension) {
195 ResourceMark rm;
196 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)",
197 (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
198 (address)_heap->high() - (address)_heap->low_boundary());
199 }
200 }
201 maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
202 (address)_heap->low_boundary()) - unallocated_capacity());
203 print_trace("allocation", cb, size);
204 _number_of_blobs++;
205 return cb;
206 }
207
208 void CodeCache::free(CodeBlob* cb) {
209 assert_locked_or_safepoint(CodeCache_lock);
210
211 print_trace("free", cb);
212 if (cb->is_nmethod()) {
213 _number_of_nmethods--;
214 if (((nmethod *)cb)->has_dependencies()) {
215 _number_of_nmethods_with_dependencies--;
216 }
217 }
218 if (cb->is_adapter_blob()) {
219 _number_of_adapters--;
220 }
221 _number_of_blobs--;
222
223 _heap->deallocate(cb);
224
225 assert(_number_of_blobs >= 0, "sanity check");
226 }
227
228
229 void CodeCache::commit(CodeBlob* cb) {
230 // this is called by nmethod::nmethod, which must already own CodeCache_lock
231 assert_locked_or_safepoint(CodeCache_lock);
232 if (cb->is_nmethod()) {
233 _number_of_nmethods++;
234 if (((nmethod *)cb)->has_dependencies()) {
235 _number_of_nmethods_with_dependencies++;
236 }
237 }
238 if (cb->is_adapter_blob()) {
239 _number_of_adapters++;
240 }
241
242 // flush the hardware I-cache
243 ICache::invalidate_range(cb->content_begin(), cb->content_size());
244 }
245
246
247 // Iteration over CodeBlobs
248
249 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) )
250 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
251 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
252 #define FOR_ALL_NMETHODS(var) for (nmethod *var = first_nmethod(); var != NULL; var = next_nmethod(var))
253
254
255 bool CodeCache::contains(void *p) {
256 // It should be ok to call contains without holding a lock
257 return _heap->contains(p);
258 }
259
260
261 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
262 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
263 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
264 CodeBlob* CodeCache::find_blob(void* start) {
265 CodeBlob* result = find_blob_unsafe(start);
266 if (result == NULL) return NULL;
267 // We could potentially look up non_entrant methods
268 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
269 return result;
270 }
271
272 nmethod* CodeCache::find_nmethod(void* start) {
273 CodeBlob *cb = find_blob(start);
274 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
275 return (nmethod*)cb;
276 }
277
278
279 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
280 assert_locked_or_safepoint(CodeCache_lock);
281 FOR_ALL_BLOBS(p) {
282 f(p);
283 }
284 }
285
286
287 void CodeCache::nmethods_do(void f(nmethod* nm)) {
288 assert_locked_or_safepoint(CodeCache_lock);
289 FOR_ALL_BLOBS(nm) {
290 if (nm->is_nmethod()) f((nmethod*)nm);
291 }
292 }
293
294 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
295 assert_locked_or_safepoint(CodeCache_lock);
296 FOR_ALL_ALIVE_NMETHODS(nm) {
297 f(nm);
298 }
299 }
300
301 int CodeCache::alignment_unit() {
302 return (int)_heap->alignment_unit();
303 }
304
305
306 int CodeCache::alignment_offset() {
307 return (int)_heap->alignment_offset();
308 }
309
310
311 // Mark nmethods for unloading if they contain otherwise unreachable
312 // oops.
313 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
314 assert_locked_or_safepoint(CodeCache_lock);
315 FOR_ALL_ALIVE_NMETHODS(nm) {
316 nm->do_unloading(is_alive, unloading_occurred);
317 }
318 }
319
320 void CodeCache::blobs_do(CodeBlobClosure* f) {
321 assert_locked_or_safepoint(CodeCache_lock);
322 FOR_ALL_ALIVE_BLOBS(cb) {
323 f->do_code_blob(cb);
324
325 #ifdef ASSERT
326 if (cb->is_nmethod())
327 ((nmethod*)cb)->verify_scavenge_root_oops();
328 #endif //ASSERT
329 }
330 }
331
332 // Walk the list of methods which might contain non-perm oops.
333 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
334 assert_locked_or_safepoint(CodeCache_lock);
335
336 if (UseG1GC) {
337 return;
338 }
339
340 debug_only(mark_scavenge_root_nmethods());
341
342 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
343 debug_only(cur->clear_scavenge_root_marked());
344 assert(cur->scavenge_root_not_marked(), "");
345 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
346
347 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
348 #ifndef PRODUCT
349 if (TraceScavenge) {
350 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
351 }
352 #endif //PRODUCT
353 if (is_live) {
354 // Perform cur->oops_do(f), maybe just once per nmethod.
355 f->do_code_blob(cur);
356 }
357 }
358
359 // Check for stray marks.
360 debug_only(verify_perm_nmethods(NULL));
361 }
362
363 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
364 assert_locked_or_safepoint(CodeCache_lock);
365
366 if (UseG1GC) {
367 return;
368 }
369
370 nm->set_on_scavenge_root_list();
371 nm->set_scavenge_root_link(_scavenge_root_nmethods);
372 set_scavenge_root_nmethods(nm);
373 print_trace("add_scavenge_root", nm);
374 }
375
376 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
377 assert_locked_or_safepoint(CodeCache_lock);
378
379 if (UseG1GC) {
380 return;
381 }
382
383 print_trace("drop_scavenge_root", nm);
384 nmethod* last = NULL;
385 nmethod* cur = scavenge_root_nmethods();
386 while (cur != NULL) {
387 nmethod* next = cur->scavenge_root_link();
388 if (cur == nm) {
389 if (last != NULL)
390 last->set_scavenge_root_link(next);
391 else set_scavenge_root_nmethods(next);
392 nm->set_scavenge_root_link(NULL);
393 nm->clear_on_scavenge_root_list();
394 return;
395 }
396 last = cur;
397 cur = next;
398 }
399 assert(false, "should have been on list");
400 }
401
402 void CodeCache::prune_scavenge_root_nmethods() {
403 assert_locked_or_safepoint(CodeCache_lock);
404
405 if (UseG1GC) {
406 return;
407 }
408
409 debug_only(mark_scavenge_root_nmethods());
410
411 nmethod* last = NULL;
412 nmethod* cur = scavenge_root_nmethods();
413 while (cur != NULL) {
414 nmethod* next = cur->scavenge_root_link();
415 debug_only(cur->clear_scavenge_root_marked());
416 assert(cur->scavenge_root_not_marked(), "");
417 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
418
419 if (!cur->is_zombie() && !cur->is_unloaded()
420 && cur->detect_scavenge_root_oops()) {
421 // Keep it. Advance 'last' to prevent deletion.
422 last = cur;
423 } else {
424 // Prune it from the list, so we don't have to look at it any more.
425 print_trace("prune_scavenge_root", cur);
426 cur->set_scavenge_root_link(NULL);
427 cur->clear_on_scavenge_root_list();
428 if (last != NULL)
429 last->set_scavenge_root_link(next);
430 else set_scavenge_root_nmethods(next);
431 }
432 cur = next;
433 }
434
435 // Check for stray marks.
436 debug_only(verify_perm_nmethods(NULL));
437 }
438
439 #ifndef PRODUCT
440 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
441 if (UseG1GC) {
442 return;
443 }
444
445 // While we are here, verify the integrity of the list.
446 mark_scavenge_root_nmethods();
447 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
448 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
449 cur->clear_scavenge_root_marked();
450 }
451 verify_perm_nmethods(f);
452 }
453
454 // Temporarily mark nmethods that are claimed to be on the non-perm list.
455 void CodeCache::mark_scavenge_root_nmethods() {
456 FOR_ALL_ALIVE_BLOBS(cb) {
457 if (cb->is_nmethod()) {
458 nmethod *nm = (nmethod*)cb;
459 assert(nm->scavenge_root_not_marked(), "clean state");
460 if (nm->on_scavenge_root_list())
461 nm->set_scavenge_root_marked();
462 }
463 }
464 }
465
466 // If the closure is given, run it on the unlisted nmethods.
467 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
468 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
469 FOR_ALL_ALIVE_BLOBS(cb) {
470 bool call_f = (f_or_null != NULL);
471 if (cb->is_nmethod()) {
472 nmethod *nm = (nmethod*)cb;
473 assert(nm->scavenge_root_not_marked(), "must be already processed");
474 if (nm->on_scavenge_root_list())
475 call_f = false; // don't show this one to the client
476 nm->verify_scavenge_root_oops();
477 } else {
478 call_f = false; // not an nmethod
479 }
480 if (call_f) f_or_null->do_code_blob(cb);
481 }
482 }
483 #endif //PRODUCT
484
485 void CodeCache::verify_clean_inline_caches() {
486 #ifdef ASSERT
487 FOR_ALL_ALIVE_BLOBS(cb) {
488 if (cb->is_nmethod()) {
489 nmethod* nm = (nmethod*)cb;
490 assert(!nm->is_unloaded(), "Tautology");
491 nm->verify_clean_inline_caches();
492 nm->verify();
493 }
494 }
495 #endif
496 }
497
498 void CodeCache::verify_icholder_relocations() {
499 #ifdef ASSERT
500 // make sure that we aren't leaking icholders
501 int count = 0;
502 FOR_ALL_BLOBS(cb) {
503 if (cb->is_nmethod()) {
504 nmethod* nm = (nmethod*)cb;
505 count += nm->verify_icholder_relocations();
506 }
507 }
508
509 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
510 CompiledICHolder::live_count(), "must agree");
511 #endif
512 }
513
514 void CodeCache::gc_prologue() {
515 }
516
517 void CodeCache::gc_epilogue() {
518 assert_locked_or_safepoint(CodeCache_lock);
519 FOR_ALL_ALIVE_BLOBS(cb) {
520 if (cb->is_nmethod()) {
521 nmethod *nm = (nmethod*)cb;
522 assert(!nm->is_unloaded(), "Tautology");
523 if (needs_cache_clean()) {
524 nm->cleanup_inline_caches();
525 }
526 DEBUG_ONLY(nm->verify());
527 DEBUG_ONLY(nm->verify_oop_relocations());
528 }
529 }
530 set_needs_cache_clean(false);
531 prune_scavenge_root_nmethods();
532
533 verify_icholder_relocations();
534 }
535
536 void CodeCache::verify_oops() {
537 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
538 VerifyOopClosure voc;
539 FOR_ALL_ALIVE_BLOBS(cb) {
540 if (cb->is_nmethod()) {
541 nmethod *nm = (nmethod*)cb;
542 nm->oops_do(&voc);
543 nm->verify_oop_relocations();
544 }
545 }
546 }
547
548
549 address CodeCache::first_address() {
550 assert_locked_or_safepoint(CodeCache_lock);
551 return (address)_heap->low_boundary();
552 }
553
554
555 address CodeCache::last_address() {
556 assert_locked_or_safepoint(CodeCache_lock);
557 return (address)_heap->high();
558 }
559
560 /**
561 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
562 * is free, reverse_free_ratio() returns 4.
563 */
564 double CodeCache::reverse_free_ratio() {
565 double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace);
566 double max_capacity = (double)CodeCache::max_capacity();
567 return max_capacity / unallocated_capacity;
568 }
569
570 void icache_init();
571
572 void CodeCache::initialize() {
573 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
574 #ifdef COMPILER2
575 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
576 #endif
577 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
578 // This was originally just a check of the alignment, causing failure, instead, round
579 // the code cache to the page size. In particular, Solaris is moving to a larger
580 // default page size.
581 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
582 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
583 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
584 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
585 vm_exit_during_initialization("Could not reserve enough space for code cache");
586 }
587
588 MemoryService::add_code_heap_memory_pool(_heap);
589
590 // Initialize ICache flush mechanism
591 // This service is needed for os::register_code_area
592 icache_init();
593
594 // Give OS a chance to register generated code area.
595 // This is used on Windows 64 bit platforms to register
596 // Structured Exception Handlers for our generated code.
597 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
598 }
599
600
601 void codeCache_init() {
602 CodeCache::initialize();
603 }
604
605 //------------------------------------------------------------------------------------------------
606
607 int CodeCache::number_of_nmethods_with_dependencies() {
608 return _number_of_nmethods_with_dependencies;
609 }
610
611 void CodeCache::clear_inline_caches() {
612 assert_locked_or_safepoint(CodeCache_lock);
613 FOR_ALL_ALIVE_NMETHODS(nm) {
614 nm->clear_inline_caches();
615 }
616 }
617
618 // Keeps track of time spent for checking dependencies
619 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)
620
621 int CodeCache::mark_for_deoptimization(DepChange& changes) {
622 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
623 int number_of_marked_CodeBlobs = 0;
624
625 // search the hierarchy looking for nmethods which are affected by the loading of this class
626
627 // then search the interfaces this class implements looking for nmethods
628 // which might be dependent of the fact that an interface only had one
629 // implementor.
630 // nmethod::check_all_dependencies works only correctly, if no safepoint
631 // can happen
632 No_Safepoint_Verifier nsv;
633 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
634 Klass* d = str.klass();
635 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
636 }
637
638 #ifndef PRODUCT
639 if (VerifyDependencies) {
640 // Object pointers are used as unique identifiers for dependency arguments. This
641 // is only possible if no safepoint, i.e., GC occurs during the verification code.
642 dependentCheckTime.start();
643 nmethod::check_all_dependencies(changes);
644 dependentCheckTime.stop();
645 }
646 #endif
647
648 return number_of_marked_CodeBlobs;
649 }
650
651
652 #ifdef HOTSWAP
653 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
654 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
655 int number_of_marked_CodeBlobs = 0;
656
657 // Deoptimize all methods of the evolving class itself
658 Array<Method*>* old_methods = dependee->methods();
659 for (int i = 0; i < old_methods->length(); i++) {
660 ResourceMark rm;
661 Method* old_method = old_methods->at(i);
662 nmethod *nm = old_method->code();
663 if (nm != NULL) {
664 nm->mark_for_deoptimization();
665 number_of_marked_CodeBlobs++;
666 }
667 }
668
669 FOR_ALL_ALIVE_NMETHODS(nm) {
670 if (nm->is_marked_for_deoptimization()) {
671 // ...Already marked in the previous pass; don't count it again.
672 } else if (nm->is_evol_dependent_on(dependee())) {
673 ResourceMark rm;
674 nm->mark_for_deoptimization();
675 number_of_marked_CodeBlobs++;
676 } else {
677 // flush caches in case they refer to a redefined Method*
678 nm->clear_inline_caches();
679 }
680 }
681
682 return number_of_marked_CodeBlobs;
683 }
684 #endif // HOTSWAP
685
686
687 // Deoptimize all methods
688 void CodeCache::mark_all_nmethods_for_deoptimization() {
689 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
690 FOR_ALL_ALIVE_NMETHODS(nm) {
691 if (!nm->method()->is_method_handle_intrinsic()) {
692 nm->mark_for_deoptimization();
693 }
694 }
695 }
696
697
698 int CodeCache::mark_for_deoptimization(Method* dependee) {
699 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
700 int number_of_marked_CodeBlobs = 0;
701
702 FOR_ALL_ALIVE_NMETHODS(nm) {
703 if (nm->is_dependent_on_method(dependee)) {
704 ResourceMark rm;
705 nm->mark_for_deoptimization();
706 number_of_marked_CodeBlobs++;
707 }
708 }
709
710 return number_of_marked_CodeBlobs;
711 }
712
713 void CodeCache::make_marked_nmethods_zombies() {
714 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
715 FOR_ALL_ALIVE_NMETHODS(nm) {
716 if (nm->is_marked_for_deoptimization()) {
717
718 // If the nmethod has already been made non-entrant and it can be converted
719 // then zombie it now. Otherwise make it non-entrant and it will eventually
720 // be zombied when it is no longer seen on the stack. Note that the nmethod
721 // might be "entrant" and not on the stack and so could be zombied immediately
722 // but we can't tell because we don't track it on stack until it becomes
723 // non-entrant.
724
725 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
726 nm->make_zombie();
727 } else {
728 nm->make_not_entrant();
729 }
730 }
731 }
732 }
733
734 void CodeCache::make_marked_nmethods_not_entrant() {
735 assert_locked_or_safepoint(CodeCache_lock);
736 FOR_ALL_ALIVE_NMETHODS(nm) {
737 if (nm->is_marked_for_deoptimization()) {
738 nm->make_not_entrant();
739 }
740 }
741 }
742
743 void CodeCache::verify() {
744 _heap->verify();
745 FOR_ALL_ALIVE_BLOBS(p) {
746 p->verify();
747 }
748 }
749
750 void CodeCache::report_codemem_full() {
751 _codemem_full_count++;
752 EventCodeCacheFull event;
753 if (event.should_commit()) {
754 event.set_startAddress((u8)low_bound());
755 event.set_commitedTopAddress((u8)high());
756 event.set_reservedTopAddress((u8)high_bound());
757 event.set_entryCount(nof_blobs());
758 event.set_methodCount(nof_nmethods());
759 event.set_adaptorCount(nof_adapters());
760 event.set_unallocatedCapacity(unallocated_capacity()/K);
761 event.set_fullCount(_codemem_full_count);
762 event.commit();
763 }
764 }
765
766 void CodeCache::print_memory_overhead() {
767 size_t wasted_bytes = 0;
768 CodeBlob *cb;
769 for (cb = first(); cb != NULL; cb = next(cb)) {
770 HeapBlock* heap_block = ((HeapBlock*)cb) - 1;
771 wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();
772 }
773 // Print bytes that are allocated in the freelist
774 ttyLocker ttl;
775 tty->print_cr("Number of elements in freelist: " SSIZE_FORMAT, freelist_length());
776 tty->print_cr("Allocated in freelist: " SSIZE_FORMAT "kB", bytes_allocated_in_freelist()/K);
777 tty->print_cr("Unused bytes in CodeBlobs: " SSIZE_FORMAT "kB", (wasted_bytes/K));
778 tty->print_cr("Segment map size: " SSIZE_FORMAT "kB", allocated_segments()/K); // 1 byte per segment
779 }
780
781 //------------------------------------------------------------------------------------------------
782 // Non-product version
783
784 #ifndef PRODUCT
785
786 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
787 if (PrintCodeCache2) { // Need to add a new flag
788 ResourceMark rm;
789 if (size == 0) size = cb->size();
790 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);
791 }
792 }
793
794 void CodeCache::print_internals() {
795 int nmethodCount = 0;
796 int runtimeStubCount = 0;
797 int adapterCount = 0;
798 int deoptimizationStubCount = 0;
799 int uncommonTrapStubCount = 0;
800 int bufferBlobCount = 0;
801 int total = 0;
802 int nmethodAlive = 0;
803 int nmethodNotEntrant = 0;
804 int nmethodZombie = 0;
805 int nmethodUnloaded = 0;
806 int nmethodJava = 0;
807 int nmethodNative = 0;
808 int max_nm_size = 0;
809 ResourceMark rm;
810
811 CodeBlob *cb;
812 for (cb = first(); cb != NULL; cb = next(cb)) {
813 total++;
814 if (cb->is_nmethod()) {
815 nmethod* nm = (nmethod*)cb;
816
817 if (Verbose && nm->method() != NULL) {
818 ResourceMark rm;
819 char *method_name = nm->method()->name_and_sig_as_C_string();
820 tty->print("%s", method_name);
821 if(nm->is_alive()) { tty->print_cr(" alive"); }
822 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
823 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
824 }
825
826 nmethodCount++;
827
828 if(nm->is_alive()) { nmethodAlive++; }
829 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
830 if(nm->is_zombie()) { nmethodZombie++; }
831 if(nm->is_unloaded()) { nmethodUnloaded++; }
832 if(nm->method() != NULL && nm->is_native_method()) { nmethodNative++; }
833
834 if(nm->method() != NULL && nm->is_java_method()) {
835 nmethodJava++;
836 max_nm_size = MAX2(max_nm_size, nm->size());
837 }
838 } else if (cb->is_runtime_stub()) {
839 runtimeStubCount++;
840 } else if (cb->is_deoptimization_stub()) {
841 deoptimizationStubCount++;
842 } else if (cb->is_uncommon_trap_stub()) {
843 uncommonTrapStubCount++;
844 } else if (cb->is_adapter_blob()) {
845 adapterCount++;
846 } else if (cb->is_buffer_blob()) {
847 bufferBlobCount++;
848 }
849 }
850
851 int bucketSize = 512;
852 int bucketLimit = max_nm_size / bucketSize + 1;
853 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
854 memset(buckets, 0, sizeof(int) * bucketLimit);
855
856 for (cb = first(); cb != NULL; cb = next(cb)) {
857 if (cb->is_nmethod()) {
858 nmethod* nm = (nmethod*)cb;
859 if(nm->is_java_method()) {
860 buckets[nm->size() / bucketSize]++;
861 }
862 }
863 }
864
865 tty->print_cr("Code Cache Entries (total of %d)",total);
866 tty->print_cr("-------------------------------------------------");
867 tty->print_cr("nmethods: %d",nmethodCount);
868 tty->print_cr("\talive: %d",nmethodAlive);
869 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
870 tty->print_cr("\tzombie: %d",nmethodZombie);
871 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
872 tty->print_cr("\tjava: %d",nmethodJava);
873 tty->print_cr("\tnative: %d",nmethodNative);
874 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
875 tty->print_cr("adapters: %d",adapterCount);
876 tty->print_cr("buffer blobs: %d",bufferBlobCount);
877 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
878 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
879 tty->print_cr("\nnmethod size distribution (non-zombie java)");
880 tty->print_cr("-------------------------------------------------");
881
882 for(int i=0; i<bucketLimit; i++) {
883 if(buckets[i] != 0) {
884 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
885 tty->fill_to(40);
886 tty->print_cr("%d",buckets[i]);
887 }
888 }
889
890 FREE_C_HEAP_ARRAY(int, buckets, mtCode);
891 print_memory_overhead();
892 }
893
894 #endif // !PRODUCT
895
896 void CodeCache::print() {
897 print_summary(tty);
898
899 #ifndef PRODUCT
900 if (!Verbose) return;
901
902 CodeBlob_sizes live;
903 CodeBlob_sizes dead;
904
905 FOR_ALL_BLOBS(p) {
906 if (!p->is_alive()) {
907 dead.add(p);
908 } else {
909 live.add(p);
910 }
911 }
912
913 tty->print_cr("CodeCache:");
914 tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());
915
916 if (!live.is_empty()) {
917 live.print("live");
918 }
919 if (!dead.is_empty()) {
920 dead.print("dead");
921 }
922
923
924 if (WizardMode) {
925 // print the oop_map usage
926 int code_size = 0;
927 int number_of_blobs = 0;
928 int number_of_oop_maps = 0;
929 int map_size = 0;
930 FOR_ALL_BLOBS(p) {
931 if (p->is_alive()) {
932 number_of_blobs++;
933 code_size += p->code_size();
934 OopMapSet* set = p->oop_maps();
935 if (set != NULL) {
936 number_of_oop_maps += set->size();
937 map_size += set->heap_size();
938 }
939 }
940 }
941 tty->print_cr("OopMaps");
942 tty->print_cr(" #blobs = %d", number_of_blobs);
943 tty->print_cr(" code size = %d", code_size);
944 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
945 tty->print_cr(" map size = %d", map_size);
946 }
947
948 #endif // !PRODUCT
949 }
950
951 void CodeCache::print_summary(outputStream* st, bool detailed) {
952 size_t total = (_heap->high_boundary() - _heap->low_boundary());
953 st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
954 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
955 total/K, (total - unallocated_capacity())/K,
956 maxCodeCacheUsed/K, unallocated_capacity()/K);
957
958 if (detailed) {
959 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
960 p2i(_heap->low_boundary()),
961 p2i(_heap->high()),
962 p2i(_heap->high_boundary()));
963 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
964 " adapters=" UINT32_FORMAT,
965 nof_blobs(), nof_nmethods(), nof_adapters());
966 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
967 "enabled" : Arguments::mode() == Arguments::_int ?
968 "disabled (interpreter mode)" :
969 "disabled (not enough contiguous free space left)");
970 }
971 }
972
973 void CodeCache::print_codelist(outputStream* st) {
974 assert_locked_or_safepoint(CodeCache_lock);
975
976 FOR_ALL_ALIVE_NMETHODS(p) {
977 ResourceMark rm;
978 char *method_name = p->method()->name_and_sig_as_C_string();
979 st->print_cr("%d %d %s ["INTPTR_FORMAT", "INTPTR_FORMAT" - "INTPTR_FORMAT"]",
980 p->compile_id(), p->comp_level(), method_name, (intptr_t)p->header_begin(),
981 (intptr_t)p->code_begin(), (intptr_t)p->code_end());
982 }
983 }
984
985 void CodeCache::print_layout(outputStream* st) {
986 assert_locked_or_safepoint(CodeCache_lock);
987 ResourceMark rm;
988
989 print_summary(st, true);
990 }
991
992 void CodeCache::log_state(outputStream* st) {
993 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
994 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
995 nof_blobs(), nof_nmethods(), nof_adapters(),
996 unallocated_capacity());
997 }
998