1 /*
2 * Copyright (c) 1997, 2018, 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 "jfr/jfrEvents.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/gcLocker.hpp"
38 #include "memory/iterator.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "oops/method.hpp"
41 #include "oops/objArrayOop.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/deoptimization.hpp"
46 #include "runtime/icache.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "services/memoryService.hpp"
50 #include "utilities/xmlstream.hpp"
51
52
53 // Helper class for printing in CodeCache
54
55 class CodeBlob_sizes {
56 private:
57 int count;
58 int total_size;
59 int header_size;
60 int code_size;
61 int stub_size;
62 int relocation_size;
63 int scopes_oop_size;
64 int scopes_metadata_size;
65 int scopes_data_size;
66 int scopes_pcs_size;
67
68 public:
69 CodeBlob_sizes() {
70 count = 0;
71 total_size = 0;
72 header_size = 0;
73 code_size = 0;
74 stub_size = 0;
75 relocation_size = 0;
76 scopes_oop_size = 0;
77 scopes_metadata_size = 0;
78 scopes_data_size = 0;
79 scopes_pcs_size = 0;
80 }
81
82 int total() { return total_size; }
83 bool is_empty() { return count == 0; }
84
85 void print(const char* title) {
86 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, metadata %d%%, data %d%%, pcs %d%%])",
87 count,
88 title,
89 (int)(total() / K),
90 header_size * 100 / total_size,
91 relocation_size * 100 / total_size,
92 code_size * 100 / total_size,
93 stub_size * 100 / total_size,
94 scopes_oop_size * 100 / total_size,
95 scopes_metadata_size * 100 / total_size,
96 scopes_data_size * 100 / total_size,
97 scopes_pcs_size * 100 / total_size);
98 }
99
100 void add(CodeBlob* cb) {
101 count++;
102 total_size += cb->size();
103 header_size += cb->header_size();
104 relocation_size += cb->relocation_size();
105 if (cb->is_nmethod()) {
106 nmethod* nm = cb->as_nmethod_or_null();
107 code_size += nm->insts_size();
108 stub_size += nm->stub_size();
109
110 scopes_oop_size += nm->oops_size();
111 scopes_metadata_size += nm->metadata_size();
112 scopes_data_size += nm->scopes_data_size();
113 scopes_pcs_size += nm->scopes_pcs_size();
114 } else {
115 code_size += cb->code_size();
116 }
117 }
118 };
119
120 // CodeCache implementation
121
122 CodeHeap * CodeCache::_heap = new CodeHeap();
123 int CodeCache::_number_of_blobs = 0;
124 int CodeCache::_number_of_adapters = 0;
125 int CodeCache::_number_of_nmethods = 0;
126 int CodeCache::_number_of_nmethods_with_dependencies = 0;
127 bool CodeCache::_needs_cache_clean = false;
128 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
129
130 int CodeCache::_codemem_full_count = 0;
131
132 CodeBlob* CodeCache::first() {
133 assert_locked_or_safepoint(CodeCache_lock);
134 return (CodeBlob*)_heap->first();
135 }
136
137
138 CodeBlob* CodeCache::next(CodeBlob* cb) {
139 assert_locked_or_safepoint(CodeCache_lock);
140 return (CodeBlob*)_heap->next(cb);
141 }
142
143
144 CodeBlob* CodeCache::alive(CodeBlob *cb) {
145 assert_locked_or_safepoint(CodeCache_lock);
146 while (cb != NULL && !cb->is_alive()) cb = next(cb);
147 return cb;
148 }
149
150
151 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
152 assert_locked_or_safepoint(CodeCache_lock);
153 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
154 return (nmethod*)cb;
155 }
156
157 nmethod* CodeCache::first_nmethod() {
158 assert_locked_or_safepoint(CodeCache_lock);
159 CodeBlob* cb = first();
160 while (cb != NULL && !cb->is_nmethod()) {
161 cb = next(cb);
162 }
163 return (nmethod*)cb;
164 }
165
166 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
167 assert_locked_or_safepoint(CodeCache_lock);
168 cb = next(cb);
169 while (cb != NULL && !cb->is_nmethod()) {
170 cb = next(cb);
171 }
172 return (nmethod*)cb;
173 }
174
175 static size_t maxCodeCacheUsed = 0;
176
177 CodeBlob* CodeCache::allocate(int size, bool is_critical) {
178 // Do not seize the CodeCache lock here--if the caller has not
179 // already done so, we are going to lose bigtime, since the code
180 // cache will contain a garbage CodeBlob until the caller can
181 // run the constructor for the CodeBlob subclass he is busy
182 // instantiating.
183 guarantee(size >= 0, "allocation request must be reasonable");
184 assert_locked_or_safepoint(CodeCache_lock);
185 CodeBlob* cb = NULL;
186 _number_of_blobs++;
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 if (CodeCache_lock->owned_by_self()) {
193 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
194 report_codemem_full();
195 } else {
196 report_codemem_full();
197 }
198 return NULL;
199 }
200 if (PrintCodeCacheExtension) {
201 ResourceMark rm;
202 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)",
203 (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
204 (address)_heap->high() - (address)_heap->low_boundary());
205 }
206 }
207 maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
208 (address)_heap->low_boundary()) - unallocated_capacity());
209 verify_if_often();
210 print_trace("allocation", cb, size);
211 return cb;
212 }
213
214 void CodeCache::free(CodeBlob* cb) {
215 assert_locked_or_safepoint(CodeCache_lock);
216 verify_if_often();
217
218 print_trace("free", cb);
219 if (cb->is_nmethod()) {
220 _number_of_nmethods--;
221 if (((nmethod *)cb)->has_dependencies()) {
222 _number_of_nmethods_with_dependencies--;
223 }
224 }
225 if (cb->is_adapter_blob()) {
226 _number_of_adapters--;
227 }
228 _number_of_blobs--;
229
230 _heap->deallocate(cb);
231
232 verify_if_often();
233 assert(_number_of_blobs >= 0, "sanity check");
234 }
235
236
237 void CodeCache::commit(CodeBlob* cb) {
238 // this is called by nmethod::nmethod, which must already own CodeCache_lock
239 assert_locked_or_safepoint(CodeCache_lock);
240 if (cb->is_nmethod()) {
241 _number_of_nmethods++;
242 if (((nmethod *)cb)->has_dependencies()) {
243 _number_of_nmethods_with_dependencies++;
244 }
245 }
246 if (cb->is_adapter_blob()) {
247 _number_of_adapters++;
248 }
249
250 // flush the hardware I-cache
251 ICache::invalidate_range(cb->content_begin(), cb->content_size());
252 }
253
254
255 void CodeCache::flush() {
256 assert_locked_or_safepoint(CodeCache_lock);
257 Unimplemented();
258 }
259
260
261 // Iteration over CodeBlobs
262
263 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) )
264 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
265 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
266
267
268 bool CodeCache::contains(void *p) {
269 // It should be ok to call contains without holding a lock
270 return _heap->contains(p);
271 }
272
273
274 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
275 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
276 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
277 CodeBlob* CodeCache::find_blob(void* start) {
278 CodeBlob* result = find_blob_unsafe(start);
279 if (result == NULL) return NULL;
280 // We could potientially look up non_entrant methods
281 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
282 return result;
283 }
284
285 nmethod* CodeCache::find_nmethod(void* start) {
286 CodeBlob *cb = find_blob(start);
287 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
288 return (nmethod*)cb;
289 }
290
291
292 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
293 assert_locked_or_safepoint(CodeCache_lock);
294 FOR_ALL_BLOBS(p) {
295 f(p);
296 }
297 }
298
299
300 void CodeCache::nmethods_do(void f(nmethod* nm)) {
301 assert_locked_or_safepoint(CodeCache_lock);
302 FOR_ALL_BLOBS(nm) {
303 if (nm->is_nmethod()) f((nmethod*)nm);
304 }
305 }
306
307 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
308 assert_locked_or_safepoint(CodeCache_lock);
309 FOR_ALL_ALIVE_NMETHODS(nm) {
310 f(nm);
311 }
312 }
313
314 int CodeCache::alignment_unit() {
315 return (int)_heap->alignment_unit();
316 }
317
318
319 int CodeCache::alignment_offset() {
320 return (int)_heap->alignment_offset();
321 }
322
323
324 // Mark nmethods for unloading if they contain otherwise unreachable
325 // oops.
326 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
327 assert_locked_or_safepoint(CodeCache_lock);
328 FOR_ALL_ALIVE_NMETHODS(nm) {
329 nm->do_unloading(is_alive, unloading_occurred);
330 }
331 }
332
333 void CodeCache::blobs_do(CodeBlobClosure* f) {
334 assert_locked_or_safepoint(CodeCache_lock);
335 FOR_ALL_ALIVE_BLOBS(cb) {
336 f->do_code_blob(cb);
337
338 #ifdef ASSERT
339 if (cb->is_nmethod())
340 ((nmethod*)cb)->verify_scavenge_root_oops();
341 #endif //ASSERT
342 }
343 }
344
345 // Walk the list of methods which might contain non-perm oops.
346 void CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure* f) {
347 assert_locked_or_safepoint(CodeCache_lock);
348
349 if (UseG1GC || UseShenandoahGC) {
350 return;
351 }
352
353 const bool fix_relocations = f->fix_relocations();
354 debug_only(mark_scavenge_root_nmethods());
355
356 nmethod* prev = NULL;
357 nmethod* cur = scavenge_root_nmethods();
358 while (cur != NULL) {
359 debug_only(cur->clear_scavenge_root_marked());
360 assert(cur->scavenge_root_not_marked(), "");
361 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
362
363 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
364 #ifndef PRODUCT
365 if (TraceScavenge) {
366 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
367 }
368 #endif //PRODUCT
369 if (is_live) {
370 // Perform cur->oops_do(f), maybe just once per nmethod.
371 f->do_code_blob(cur);
372 }
373 nmethod* const next = cur->scavenge_root_link();
374 // The scavengable nmethod list must contain all methods with scavengable
375 // oops. It is safe to include more nmethod on the list, but we do not
376 // expect any live non-scavengable nmethods on the list.
377 if (fix_relocations) {
378 if (!is_live || !cur->detect_scavenge_root_oops()) {
379 unlink_scavenge_root_nmethod(cur, prev);
380 } else {
381 prev = cur;
382 }
383 }
384 cur = next;
385 }
386
387 // Check for stray marks.
388 debug_only(verify_perm_nmethods(NULL));
389 }
390
391 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
392 assert_locked_or_safepoint(CodeCache_lock);
393
394 if (UseG1GC || UseShenandoahGC) {
395 return;
396 }
397
398 nm->set_on_scavenge_root_list();
399 nm->set_scavenge_root_link(_scavenge_root_nmethods);
400 set_scavenge_root_nmethods(nm);
401 print_trace("add_scavenge_root", nm);
402 }
403
404 void CodeCache::unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev) {
405 assert_locked_or_safepoint(CodeCache_lock);
406
407 assert((prev == NULL && scavenge_root_nmethods() == nm) ||
408 (prev != NULL && prev->scavenge_root_link() == nm), "precondition");
409
410 assert(!UseG1GC, "G1 does not use the scavenge_root_nmethods list");
411
412 print_trace("unlink_scavenge_root", nm);
413 if (prev == NULL) {
414 set_scavenge_root_nmethods(nm->scavenge_root_link());
415 } else {
416 prev->set_scavenge_root_link(nm->scavenge_root_link());
417 }
418 nm->set_scavenge_root_link(NULL);
419 nm->clear_on_scavenge_root_list();
420 }
421
422 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
423 assert_locked_or_safepoint(CodeCache_lock);
424
425 if (UseG1GC || UseShenandoahGC) {
426 return;
427 }
428
429 print_trace("drop_scavenge_root", nm);
430 nmethod* prev = NULL;
431 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
432 if (cur == nm) {
433 unlink_scavenge_root_nmethod(cur, prev);
434 return;
435 }
436 prev = cur;
437 }
438 assert(false, "should have been on list");
439 }
440
441 void CodeCache::prune_scavenge_root_nmethods() {
442 assert_locked_or_safepoint(CodeCache_lock);
443
444 if (UseG1GC || UseShenandoahGC) {
445 return;
446 }
447
448 debug_only(mark_scavenge_root_nmethods());
449
450 nmethod* last = NULL;
451 nmethod* cur = scavenge_root_nmethods();
452 while (cur != NULL) {
453 nmethod* next = cur->scavenge_root_link();
454 debug_only(cur->clear_scavenge_root_marked());
455 assert(cur->scavenge_root_not_marked(), "");
456 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
457
458 if (!cur->is_zombie() && !cur->is_unloaded()
459 && cur->detect_scavenge_root_oops()) {
460 // Keep it. Advance 'last' to prevent deletion.
461 last = cur;
462 } else {
463 // Prune it from the list, so we don't have to look at it any more.
464 print_trace("prune_scavenge_root", cur);
465 unlink_scavenge_root_nmethod(cur, last);
466 }
467 cur = next;
468 }
469
470 // Check for stray marks.
471 debug_only(verify_perm_nmethods(NULL));
472 }
473
474 #ifndef PRODUCT
475 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
476 if (UseG1GC || UseShenandoahGC) {
477 return;
478 }
479
480 // While we are here, verify the integrity of the list.
481 mark_scavenge_root_nmethods();
482 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
483 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
484 cur->clear_scavenge_root_marked();
485 }
486 verify_perm_nmethods(f);
487 }
488
489 // Temporarily mark nmethods that are claimed to be on the non-perm list.
490 void CodeCache::mark_scavenge_root_nmethods() {
491 FOR_ALL_ALIVE_BLOBS(cb) {
492 if (cb->is_nmethod()) {
493 nmethod *nm = (nmethod*)cb;
494 assert(nm->scavenge_root_not_marked(), "clean state");
495 if (nm->on_scavenge_root_list())
496 nm->set_scavenge_root_marked();
497 }
498 }
499 }
500
501 // If the closure is given, run it on the unlisted nmethods.
502 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
503 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
504 FOR_ALL_ALIVE_BLOBS(cb) {
505 bool call_f = (f_or_null != NULL);
506 if (cb->is_nmethod()) {
507 nmethod *nm = (nmethod*)cb;
508 assert(nm->scavenge_root_not_marked(), "must be already processed");
509 if (nm->on_scavenge_root_list())
510 call_f = false; // don't show this one to the client
511 nm->verify_scavenge_root_oops();
512 } else {
513 call_f = false; // not an nmethod
514 }
515 if (call_f) f_or_null->do_code_blob(cb);
516 }
517 }
518 #endif //PRODUCT
519
520 void CodeCache::verify_clean_inline_caches() {
521 #ifdef ASSERT
522 FOR_ALL_ALIVE_BLOBS(cb) {
523 if (cb->is_nmethod()) {
524 nmethod* nm = (nmethod*)cb;
525 assert(!nm->is_unloaded(), "Tautology");
526 nm->verify_clean_inline_caches();
527 nm->verify();
528 }
529 }
530 #endif
531 }
532
533 void CodeCache::verify_icholder_relocations() {
534 #ifdef ASSERT
535 // make sure that we aren't leaking icholders
536 int count = 0;
537 FOR_ALL_BLOBS(cb) {
538 if (cb->is_nmethod()) {
539 nmethod* nm = (nmethod*)cb;
540 count += nm->verify_icholder_relocations();
541 }
542 }
543
544 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
545 CompiledICHolder::live_count(), "must agree");
546 #endif
547 }
548
549 void CodeCache::gc_prologue() {
550 }
551
552 void CodeCache::gc_epilogue() {
553 assert_locked_or_safepoint(CodeCache_lock);
554 NOT_DEBUG(if (needs_cache_clean())) {
555 FOR_ALL_ALIVE_BLOBS(cb) {
556 if (cb->is_nmethod()) {
557 nmethod *nm = (nmethod*)cb;
558 assert(!nm->is_unloaded(), "Tautology");
559 DEBUG_ONLY(if (needs_cache_clean())) {
560 nm->cleanup_inline_caches();
561 }
562 DEBUG_ONLY(nm->verify());
563 DEBUG_ONLY(nm->verify_oop_relocations());
564 }
565 }
566 }
567 set_needs_cache_clean(false);
568 prune_scavenge_root_nmethods();
569
570 verify_icholder_relocations();
571 }
572
573 void CodeCache::verify_oops() {
574 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
575 VerifyOopClosure voc;
576 FOR_ALL_ALIVE_BLOBS(cb) {
577 if (cb->is_nmethod()) {
578 nmethod *nm = (nmethod*)cb;
579 nm->oops_do(&voc);
580 nm->verify_oop_relocations();
581 }
582 }
583 }
584
585
586 address CodeCache::first_address() {
587 assert_locked_or_safepoint(CodeCache_lock);
588 return (address)_heap->low_boundary();
589 }
590
591
592 address CodeCache::last_address() {
593 assert_locked_or_safepoint(CodeCache_lock);
594 return (address)_heap->high();
595 }
596
597 /**
598 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
599 * is free, reverse_free_ratio() returns 4.
600 */
601 double CodeCache::reverse_free_ratio() {
602 double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace);
603 double max_capacity = (double)CodeCache::max_capacity();
604 return max_capacity / unallocated_capacity;
605 }
606
607 void icache_init();
608
609 void CodeCache::initialize() {
610 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
611 #ifdef COMPILER2
612 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
613 #endif
614 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
615 // This was originally just a check of the alignment, causing failure, instead, round
616 // the code cache to the page size. In particular, Solaris is moving to a larger
617 // default page size.
618 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
619 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
620 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
621 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
622 vm_exit_during_initialization("Could not reserve enough space for code cache");
623 }
624
625 MemoryService::add_code_heap_memory_pool(_heap);
626
627 // Initialize ICache flush mechanism
628 // This service is needed for os::register_code_area
629 icache_init();
630
631 // Give OS a chance to register generated code area.
632 // This is used on Windows 64 bit platforms to register
633 // Structured Exception Handlers for our generated code.
634 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
635 }
636
637
638 void codeCache_init() {
639 CodeCache::initialize();
640 }
641
642 //------------------------------------------------------------------------------------------------
643
644 int CodeCache::number_of_nmethods_with_dependencies() {
645 return _number_of_nmethods_with_dependencies;
646 }
647
648 void CodeCache::clear_inline_caches() {
649 assert_locked_or_safepoint(CodeCache_lock);
650 FOR_ALL_ALIVE_NMETHODS(nm) {
651 nm->clear_inline_caches();
652 }
653 }
654
655 #ifndef PRODUCT
656 // used to keep track of how much time is spent in mark_for_deoptimization
657 static elapsedTimer dependentCheckTime;
658 static int dependentCheckCount = 0;
659 #endif // PRODUCT
660
661
662 int CodeCache::mark_for_deoptimization(DepChange& changes) {
663 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
664
665 #ifndef PRODUCT
666 dependentCheckTime.start();
667 dependentCheckCount++;
668 #endif // PRODUCT
669
670 int number_of_marked_CodeBlobs = 0;
671
672 // search the hierarchy looking for nmethods which are affected by the loading of this class
673
674 // then search the interfaces this class implements looking for nmethods
675 // which might be dependent of the fact that an interface only had one
676 // implementor.
677
678 { No_Safepoint_Verifier nsv;
679 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
680 Klass* d = str.klass();
681 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
682 }
683 }
684
685 if (VerifyDependencies) {
686 // Turn off dependency tracing while actually testing deps.
687 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
688 FOR_ALL_ALIVE_NMETHODS(nm) {
689 if (!nm->is_marked_for_deoptimization() &&
690 nm->check_all_dependencies()) {
691 ResourceMark rm;
692 tty->print_cr("Should have been marked for deoptimization:");
693 changes.print();
694 nm->print();
695 nm->print_dependencies();
696 }
697 }
698 }
699
700 #ifndef PRODUCT
701 dependentCheckTime.stop();
702 #endif // PRODUCT
703
704 return number_of_marked_CodeBlobs;
705 }
706
707
708 #ifdef HOTSWAP
709 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
710 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
711 int number_of_marked_CodeBlobs = 0;
712
713 // Deoptimize all methods of the evolving class itself
714 Array<Method*>* old_methods = dependee->methods();
715 for (int i = 0; i < old_methods->length(); i++) {
716 ResourceMark rm;
717 Method* old_method = old_methods->at(i);
718 nmethod *nm = old_method->code();
719 if (nm != NULL) {
720 nm->mark_for_deoptimization();
721 number_of_marked_CodeBlobs++;
722 }
723 }
724
725 FOR_ALL_ALIVE_NMETHODS(nm) {
726 if (nm->is_marked_for_deoptimization()) {
727 // ...Already marked in the previous pass; don't count it again.
728 } else if (nm->is_evol_dependent_on(dependee())) {
729 ResourceMark rm;
730 nm->mark_for_deoptimization();
731 number_of_marked_CodeBlobs++;
732 } else {
733 // flush caches in case they refer to a redefined Method*
734 nm->clear_inline_caches();
735 }
736 }
737
738 return number_of_marked_CodeBlobs;
739 }
740 #endif // HOTSWAP
741
742
743 // Deoptimize all methods
744 void CodeCache::mark_all_nmethods_for_deoptimization() {
745 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
746 FOR_ALL_ALIVE_NMETHODS(nm) {
747 if (!nm->method()->is_method_handle_intrinsic()) {
748 nm->mark_for_deoptimization();
749 }
750 }
751 }
752
753
754 int CodeCache::mark_for_deoptimization(Method* dependee) {
755 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
756 int number_of_marked_CodeBlobs = 0;
757
758 FOR_ALL_ALIVE_NMETHODS(nm) {
759 if (nm->is_dependent_on_method(dependee)) {
760 ResourceMark rm;
761 nm->mark_for_deoptimization();
762 number_of_marked_CodeBlobs++;
763 }
764 }
765
766 return number_of_marked_CodeBlobs;
767 }
768
769 void CodeCache::make_marked_nmethods_not_entrant() {
770 assert_locked_or_safepoint(CodeCache_lock);
771 FOR_ALL_ALIVE_NMETHODS(nm) {
772 if (nm->is_marked_for_deoptimization()) {
773 nm->make_not_entrant();
774 }
775 }
776 }
777
778 void CodeCache::verify() {
779 _heap->verify();
780 FOR_ALL_ALIVE_BLOBS(p) {
781 p->verify();
782 }
783 }
784
785 void CodeCache::report_codemem_full() {
786 _codemem_full_count++;
787 EventCodeCacheFull event;
788 if (event.should_commit()) {
789 event.set_codeBlobType((u1)CodeBlobType::All);
790 event.set_startAddress((u8)low_bound());
791 event.set_commitedTopAddress((u8)high());
792 event.set_reservedTopAddress((u8)high_bound());
793 event.set_entryCount(nof_blobs());
794 event.set_methodCount(nof_nmethods());
795 event.set_adaptorCount(nof_adapters());
796 event.set_unallocatedCapacity(unallocated_capacity()/K);
797 event.set_fullCount(_codemem_full_count);
798 event.commit();
799 }
800 }
801
802 //------------------------------------------------------------------------------------------------
803 // Non-product version
804
805 #ifndef PRODUCT
806
807 void CodeCache::verify_if_often() {
808 if (VerifyCodeCacheOften) {
809 _heap->verify();
810 }
811 }
812
813 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
814 if (PrintCodeCache2) { // Need to add a new flag
815 ResourceMark rm;
816 if (size == 0) size = cb->size();
817 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);
818 }
819 }
820
821 void CodeCache::print_internals() {
822 int nmethodCount = 0;
823 int runtimeStubCount = 0;
824 int adapterCount = 0;
825 int deoptimizationStubCount = 0;
826 int uncommonTrapStubCount = 0;
827 int bufferBlobCount = 0;
828 int total = 0;
829 int nmethodAlive = 0;
830 int nmethodNotEntrant = 0;
831 int nmethodZombie = 0;
832 int nmethodUnloaded = 0;
833 int nmethodJava = 0;
834 int nmethodNative = 0;
835 int maxCodeSize = 0;
836 ResourceMark rm;
837
838 CodeBlob *cb;
839 for (cb = first(); cb != NULL; cb = next(cb)) {
840 total++;
841 if (cb->is_nmethod()) {
842 nmethod* nm = (nmethod*)cb;
843
844 if (Verbose && nm->method() != NULL) {
845 ResourceMark rm;
846 char *method_name = nm->method()->name_and_sig_as_C_string();
847 tty->print("%s", method_name);
848 if(nm->is_alive()) { tty->print_cr(" alive"); }
849 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
850 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
851 }
852
853 nmethodCount++;
854
855 if(nm->is_alive()) { nmethodAlive++; }
856 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
857 if(nm->is_zombie()) { nmethodZombie++; }
858 if(nm->is_unloaded()) { nmethodUnloaded++; }
859 if(nm->is_native_method()) { nmethodNative++; }
860
861 if(nm->method() != NULL && nm->is_java_method()) {
862 nmethodJava++;
863 if (nm->insts_size() > maxCodeSize) {
864 maxCodeSize = nm->insts_size();
865 }
866 }
867 } else if (cb->is_runtime_stub()) {
868 runtimeStubCount++;
869 } else if (cb->is_deoptimization_stub()) {
870 deoptimizationStubCount++;
871 } else if (cb->is_uncommon_trap_stub()) {
872 uncommonTrapStubCount++;
873 } else if (cb->is_adapter_blob()) {
874 adapterCount++;
875 } else if (cb->is_buffer_blob()) {
876 bufferBlobCount++;
877 }
878 }
879
880 int bucketSize = 512;
881 int bucketLimit = maxCodeSize / bucketSize + 1;
882 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
883 memset(buckets,0,sizeof(int) * bucketLimit);
884
885 for (cb = first(); cb != NULL; cb = next(cb)) {
886 if (cb->is_nmethod()) {
887 nmethod* nm = (nmethod*)cb;
888 if(nm->is_java_method()) {
889 buckets[nm->insts_size() / bucketSize]++;
890 }
891 }
892 }
893 tty->print_cr("Code Cache Entries (total of %d)",total);
894 tty->print_cr("-------------------------------------------------");
895 tty->print_cr("nmethods: %d",nmethodCount);
896 tty->print_cr("\talive: %d",nmethodAlive);
897 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
898 tty->print_cr("\tzombie: %d",nmethodZombie);
899 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
900 tty->print_cr("\tjava: %d",nmethodJava);
901 tty->print_cr("\tnative: %d",nmethodNative);
902 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
903 tty->print_cr("adapters: %d",adapterCount);
904 tty->print_cr("buffer blobs: %d",bufferBlobCount);
905 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
906 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
907 tty->print_cr("\nnmethod size distribution (non-zombie java)");
908 tty->print_cr("-------------------------------------------------");
909
910 for(int i=0; i<bucketLimit; i++) {
911 if(buckets[i] != 0) {
912 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
913 tty->fill_to(40);
914 tty->print_cr("%d",buckets[i]);
915 }
916 }
917
918 FREE_C_HEAP_ARRAY(int, buckets, mtCode);
919 }
920
921 #endif // !PRODUCT
922
923 void CodeCache::print() {
924 print_summary(tty);
925
926 #ifndef PRODUCT
927 if (!Verbose) return;
928
929 CodeBlob_sizes live;
930 CodeBlob_sizes dead;
931
932 FOR_ALL_BLOBS(p) {
933 if (!p->is_alive()) {
934 dead.add(p);
935 } else {
936 live.add(p);
937 }
938 }
939
940 tty->print_cr("CodeCache:");
941
942 tty->print_cr("nmethod dependency checking time %f, per dependent %f", dependentCheckTime.seconds(),
943 dependentCheckTime.seconds() / dependentCheckCount);
944
945 if (!live.is_empty()) {
946 live.print("live");
947 }
948 if (!dead.is_empty()) {
949 dead.print("dead");
950 }
951
952
953 if (WizardMode) {
954 // print the oop_map usage
955 int code_size = 0;
956 int number_of_blobs = 0;
957 int number_of_oop_maps = 0;
958 int map_size = 0;
959 FOR_ALL_BLOBS(p) {
960 if (p->is_alive()) {
961 number_of_blobs++;
962 code_size += p->code_size();
963 OopMapSet* set = p->oop_maps();
964 if (set != NULL) {
965 number_of_oop_maps += set->size();
966 map_size += set->heap_size();
967 }
968 }
969 }
970 tty->print_cr("OopMaps");
971 tty->print_cr(" #blobs = %d", number_of_blobs);
972 tty->print_cr(" code size = %d", code_size);
973 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
974 tty->print_cr(" map size = %d", map_size);
975 }
976
977 #endif // !PRODUCT
978 }
979
980 void CodeCache::print_summary(outputStream* st, bool detailed) {
981 size_t total = (_heap->high_boundary() - _heap->low_boundary());
982 st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
983 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
984 total/K, (total - unallocated_capacity())/K,
985 maxCodeCacheUsed/K, unallocated_capacity()/K);
986
987 if (detailed) {
988 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
989 p2i(_heap->low_boundary()),
990 p2i(_heap->high()),
991 p2i(_heap->high_boundary()));
992 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
993 " adapters=" UINT32_FORMAT,
994 nof_blobs(), nof_nmethods(), nof_adapters());
995 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
996 "enabled" : Arguments::mode() == Arguments::_int ?
997 "disabled (interpreter mode)" :
998 "disabled (not enough contiguous free space left)");
999 }
1000 }
1001
1002 void CodeCache::log_state(outputStream* st) {
1003 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
1004 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
1005 nof_blobs(), nof_nmethods(), nof_adapters(),
1006 unallocated_capacity());
1007 }