1 /*
2 * Copyright (c) 1997, 2013, 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 "interpreter/abstractInterpreter.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/icache.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/mutexLocker.hpp"
48 #include "services/memoryService.hpp"
49 #include "trace/tracing.hpp"
50 #include "utilities/xmlstream.hpp"
51
52 // Helper class for printing in CodeCache
53
54 class CodeBlob_sizes {
55 private:
56 int count;
57 int total_size;
58 int header_size;
59 int code_size;
60 int stub_size;
61 int relocation_size;
62 int scopes_oop_size;
63 int scopes_metadata_size;
64 int scopes_data_size;
65 int scopes_pcs_size;
66
67 public:
68 CodeBlob_sizes() {
69 count = 0;
70 total_size = 0;
71 header_size = 0;
72 code_size = 0;
73 stub_size = 0;
74 relocation_size = 0;
75 scopes_oop_size = 0;
76 scopes_metadata_size = 0;
77 scopes_data_size = 0;
78 scopes_pcs_size = 0;
79 }
80
81 int total() { return total_size; }
82 bool is_empty() { return count == 0; }
83
84 void print(const char* title) {
85 if (count == 0) {
86 tty->print_cr(" #%d %s", count, title);
87 } else {
88 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])",
89 count,
90 title,
91 total() / K,
92 header_size * 100 / total_size,
93 relocation_size * 100 / total_size,
94 code_size * 100 / total_size,
95 stub_size * 100 / total_size,
96 scopes_oop_size * 100 / total_size,
97 scopes_metadata_size * 100 / total_size,
98 scopes_data_size * 100 / total_size,
99 scopes_pcs_size * 100 / total_size);
100 }
101 }
102
103 void add(CodeBlob* cb) {
104 count++;
105 total_size += cb->size();
106 header_size += cb->header_size();
107 relocation_size += cb->relocation_size();
108 if (cb->is_nmethod()) {
109 nmethod* nm = cb->as_nmethod_or_null();
110 code_size += nm->insts_size();
111 stub_size += nm->stub_size();
112
113 scopes_oop_size += nm->oops_size();
114 scopes_metadata_size += nm->metadata_size();
115 scopes_data_size += nm->scopes_data_size();
116 scopes_pcs_size += nm->scopes_pcs_size();
117 } else {
118 code_size += cb->code_size();
119 }
120 }
121 };
122
123 // CodeCache implementation
124
125 CodeHeap * CodeCache::_heap = new CodeHeap();
126 int CodeCache::_number_of_blobs = 0;
127 int CodeCache::_number_of_adapters = 0;
128 int CodeCache::_number_of_nmethods = 0;
129 int CodeCache::_number_of_nmethods_with_dependencies = 0;
130 bool CodeCache::_needs_cache_clean = false;
131 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
132 nmethod* CodeCache::_saved_nmethods = NULL;
133
134 int CodeCache::_codemem_full_count = 0;
135
136 CodeBlob* CodeCache::first() {
137 assert_locked_or_safepoint(CodeCache_lock);
138 return (CodeBlob*)_heap->first();
139 }
140
141
142 CodeBlob* CodeCache::next(CodeBlob* cb) {
143 assert_locked_or_safepoint(CodeCache_lock);
144 return (CodeBlob*)_heap->next(cb);
145 }
146
147
148 CodeBlob* CodeCache::alive(CodeBlob *cb) {
149 assert_locked_or_safepoint(CodeCache_lock);
150 while (cb != NULL && !cb->is_alive()) cb = next(cb);
151 return cb;
152 }
153
154
155 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
156 assert_locked_or_safepoint(CodeCache_lock);
157 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
158 return (nmethod*)cb;
159 }
160
161 nmethod* CodeCache::first_nmethod() {
162 assert_locked_or_safepoint(CodeCache_lock);
163 CodeBlob* cb = first();
164 while (cb != NULL && !cb->is_nmethod()) {
165 cb = next(cb);
166 }
167 return (nmethod*)cb;
168 }
169
170 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
171 assert_locked_or_safepoint(CodeCache_lock);
172 cb = next(cb);
173 while (cb != NULL && !cb->is_nmethod()) {
174 cb = next(cb);
175 }
176 return (nmethod*)cb;
177 }
178
179 static size_t maxCodeCacheUsed = 0;
180
181 CodeBlob* CodeCache::allocate(int size, bool is_critical) {
182 // Do not seize the CodeCache lock here--if the caller has not
183 // already done so, we are going to lose bigtime, since the code
184 // cache will contain a garbage CodeBlob until the caller can
185 // run the constructor for the CodeBlob subclass he is busy
186 // instantiating.
187 guarantee(size >= 0, "allocation request must be reasonable");
188 assert_locked_or_safepoint(CodeCache_lock);
189 CodeBlob* cb = NULL;
190 _number_of_blobs++;
191 while (true) {
192 cb = (CodeBlob*)_heap->allocate(size, is_critical);
193 if (cb != NULL) break;
194 if (!_heap->expand_by(CodeCacheExpansionSize)) {
195 // Expansion failed
196 return NULL;
197 }
198 if (PrintCodeCacheExtension) {
199 ResourceMark rm;
200 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
201 (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
202 (address)_heap->high() - (address)_heap->low_boundary());
203 }
204 }
205 maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
206 (address)_heap->low_boundary()) - unallocated_capacity());
207 verify_if_often();
208 print_trace("allocation", cb, size);
209 return cb;
210 }
211
212 void CodeCache::free(CodeBlob* cb) {
213 assert_locked_or_safepoint(CodeCache_lock);
214 verify_if_often();
215
216 print_trace("free", cb);
217 if (cb->is_nmethod()) {
218 _number_of_nmethods--;
219 if (((nmethod *)cb)->has_dependencies()) {
220 _number_of_nmethods_with_dependencies--;
221 }
222 }
223 if (cb->is_adapter_blob()) {
224 _number_of_adapters--;
225 }
226 _number_of_blobs--;
227
228 _heap->deallocate(cb);
229
230 verify_if_often();
231 assert(_number_of_blobs >= 0, "sanity check");
232 }
233
234
235 void CodeCache::commit(CodeBlob* cb) {
236 // this is called by nmethod::nmethod, which must already own CodeCache_lock
237 assert_locked_or_safepoint(CodeCache_lock);
238 if (cb->is_nmethod()) {
239 _number_of_nmethods++;
240 if (((nmethod *)cb)->has_dependencies()) {
241 _number_of_nmethods_with_dependencies++;
242 }
243 }
244 if (cb->is_adapter_blob()) {
245 _number_of_adapters++;
246 }
247
248 // flush the hardware I-cache
249 ICache::invalidate_range(cb->content_begin(), cb->content_size());
250 }
251
252
253 void CodeCache::flush() {
254 assert_locked_or_safepoint(CodeCache_lock);
255 Unimplemented();
256 }
257
258
259 // Iteration over CodeBlobs
260
261 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) )
262 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
263 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
264
265
266 bool CodeCache::contains(void *p) {
267 // It should be ok to call contains without holding a lock
268 return _heap->contains(p);
269 }
270
271
272 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
273 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
274 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
275 CodeBlob* CodeCache::find_blob(void* start) {
276 CodeBlob* result = find_blob_unsafe(start);
277 if (result == NULL) return NULL;
278 // We could potientially look up non_entrant methods
279 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
280 return result;
281 }
282
283 nmethod* CodeCache::find_nmethod(void* start) {
284 CodeBlob *cb = find_blob(start);
285 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
286 return (nmethod*)cb;
287 }
288
289
290 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
291 assert_locked_or_safepoint(CodeCache_lock);
292 FOR_ALL_BLOBS(p) {
293 f(p);
294 }
295 }
296
297
298 void CodeCache::nmethods_do(void f(nmethod* nm)) {
299 assert_locked_or_safepoint(CodeCache_lock);
300 FOR_ALL_BLOBS(nm) {
301 if (nm->is_nmethod()) f((nmethod*)nm);
302 }
303 }
304
305 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
306 assert_locked_or_safepoint(CodeCache_lock);
307 FOR_ALL_ALIVE_NMETHODS(nm) {
308 f(nm);
309 }
310 }
311
312 int CodeCache::alignment_unit() {
313 return (int)_heap->alignment_unit();
314 }
315
316
317 int CodeCache::alignment_offset() {
318 return (int)_heap->alignment_offset();
319 }
320
321
322 // Mark nmethods for unloading if they contain otherwise unreachable
323 // oops.
324 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
325 assert_locked_or_safepoint(CodeCache_lock);
326 FOR_ALL_ALIVE_NMETHODS(nm) {
327 nm->do_unloading(is_alive, unloading_occurred);
328 }
329 }
330
331 void CodeCache::blobs_do(CodeBlobClosure* f) {
332 assert_locked_or_safepoint(CodeCache_lock);
333 FOR_ALL_ALIVE_BLOBS(cb) {
334 f->do_code_blob(cb);
335
336 #ifdef ASSERT
337 if (cb->is_nmethod())
338 ((nmethod*)cb)->verify_scavenge_root_oops();
339 #endif //ASSERT
340 }
341 }
342
343 // Walk the list of methods which might contain non-perm oops.
344 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
345 assert_locked_or_safepoint(CodeCache_lock);
346 debug_only(mark_scavenge_root_nmethods());
347
348 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
349 debug_only(cur->clear_scavenge_root_marked());
350 assert(cur->scavenge_root_not_marked(), "");
351 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
352
353 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
354 #ifndef PRODUCT
355 if (TraceScavenge) {
356 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
357 }
358 #endif //PRODUCT
359 if (is_live) {
360 // Perform cur->oops_do(f), maybe just once per nmethod.
361 f->do_code_blob(cur);
362 }
363 }
364
365 // Check for stray marks.
366 debug_only(verify_perm_nmethods(NULL));
367 }
368
369 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
370 assert_locked_or_safepoint(CodeCache_lock);
371 nm->set_on_scavenge_root_list();
372 nm->set_scavenge_root_link(_scavenge_root_nmethods);
373 set_scavenge_root_nmethods(nm);
374 print_trace("add_scavenge_root", nm);
375 }
376
377 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
378 assert_locked_or_safepoint(CodeCache_lock);
379 print_trace("drop_scavenge_root", nm);
380 nmethod* last = NULL;
381 nmethod* cur = scavenge_root_nmethods();
382 while (cur != NULL) {
383 nmethod* next = cur->scavenge_root_link();
384 if (cur == nm) {
385 if (last != NULL)
386 last->set_scavenge_root_link(next);
387 else set_scavenge_root_nmethods(next);
388 nm->set_scavenge_root_link(NULL);
389 nm->clear_on_scavenge_root_list();
390 return;
391 }
392 last = cur;
393 cur = next;
394 }
395 assert(false, "should have been on list");
396 }
397
398 void CodeCache::prune_scavenge_root_nmethods() {
399 assert_locked_or_safepoint(CodeCache_lock);
400 debug_only(mark_scavenge_root_nmethods());
401
402 nmethod* last = NULL;
403 nmethod* cur = scavenge_root_nmethods();
404 while (cur != NULL) {
405 nmethod* next = cur->scavenge_root_link();
406 debug_only(cur->clear_scavenge_root_marked());
407 assert(cur->scavenge_root_not_marked(), "");
408 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
409
410 if (!cur->is_zombie() && !cur->is_unloaded()
411 && cur->detect_scavenge_root_oops()) {
412 // Keep it. Advance 'last' to prevent deletion.
413 last = cur;
414 } else {
415 // Prune it from the list, so we don't have to look at it any more.
416 print_trace("prune_scavenge_root", cur);
417 cur->set_scavenge_root_link(NULL);
418 cur->clear_on_scavenge_root_list();
419 if (last != NULL)
420 last->set_scavenge_root_link(next);
421 else set_scavenge_root_nmethods(next);
422 }
423 cur = next;
424 }
425
426 // Check for stray marks.
427 debug_only(verify_perm_nmethods(NULL));
428 }
429
430 #ifndef PRODUCT
431 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
432 // While we are here, verify the integrity of the list.
433 mark_scavenge_root_nmethods();
434 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
435 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
436 cur->clear_scavenge_root_marked();
437 }
438 verify_perm_nmethods(f);
439 }
440
441 // Temporarily mark nmethods that are claimed to be on the non-perm list.
442 void CodeCache::mark_scavenge_root_nmethods() {
443 FOR_ALL_ALIVE_BLOBS(cb) {
444 if (cb->is_nmethod()) {
445 nmethod *nm = (nmethod*)cb;
446 assert(nm->scavenge_root_not_marked(), "clean state");
447 if (nm->on_scavenge_root_list())
448 nm->set_scavenge_root_marked();
449 }
450 }
451 }
452
453 // If the closure is given, run it on the unlisted nmethods.
454 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
455 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
456 FOR_ALL_ALIVE_BLOBS(cb) {
457 bool call_f = (f_or_null != NULL);
458 if (cb->is_nmethod()) {
459 nmethod *nm = (nmethod*)cb;
460 assert(nm->scavenge_root_not_marked(), "must be already processed");
461 if (nm->on_scavenge_root_list())
462 call_f = false; // don't show this one to the client
463 nm->verify_scavenge_root_oops();
464 } else {
465 call_f = false; // not an nmethod
466 }
467 if (call_f) f_or_null->do_code_blob(cb);
468 }
469 }
470 #endif //PRODUCT
471
472 /**
473 * Remove and return nmethod from the saved code list in order to reanimate it.
474 */
475 nmethod* CodeCache::reanimate_saved_code(Method* m) {
476 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
477 nmethod* saved = _saved_nmethods;
478 nmethod* prev = NULL;
479 while (saved != NULL) {
480 if (saved->is_in_use() && saved->method() == m) {
481 if (prev != NULL) {
482 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
483 } else {
484 _saved_nmethods = saved->saved_nmethod_link();
485 }
486 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
487 saved->set_speculatively_disconnected(false);
488 saved->set_saved_nmethod_link(NULL);
489 if (PrintMethodFlushing) {
490 saved->print_on(tty, " ### nmethod is reconnected");
491 }
492 if (LogCompilation && (xtty != NULL)) {
493 ttyLocker ttyl;
494 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
495 xtty->method(m);
496 xtty->stamp();
497 xtty->end_elem();
498 }
499 return saved;
500 }
501 prev = saved;
502 saved = saved->saved_nmethod_link();
503 }
504 return NULL;
505 }
506
507 /**
508 * Remove nmethod from the saved code list in order to discard it permanently
509 */
510 void CodeCache::remove_saved_code(nmethod* nm) {
511 // For conc swpr this will be called with CodeCache_lock taken by caller
512 assert_locked_or_safepoint(CodeCache_lock);
513 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
514 nmethod* saved = _saved_nmethods;
515 nmethod* prev = NULL;
516 while (saved != NULL) {
517 if (saved == nm) {
518 if (prev != NULL) {
519 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
520 } else {
521 _saved_nmethods = saved->saved_nmethod_link();
522 }
523 if (LogCompilation && (xtty != NULL)) {
524 ttyLocker ttyl;
525 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
526 xtty->stamp();
527 xtty->end_elem();
528 }
529 return;
530 }
531 prev = saved;
532 saved = saved->saved_nmethod_link();
533 }
534 ShouldNotReachHere();
535 }
536
537 void CodeCache::speculatively_disconnect(nmethod* nm) {
538 assert_locked_or_safepoint(CodeCache_lock);
539 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
540 nm->set_saved_nmethod_link(_saved_nmethods);
541 _saved_nmethods = nm;
542 if (PrintMethodFlushing) {
543 nm->print_on(tty, " ### nmethod is speculatively disconnected");
544 }
545 if (LogCompilation && (xtty != NULL)) {
546 ttyLocker ttyl;
547 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
548 xtty->method(nm->method());
549 xtty->stamp();
550 xtty->end_elem();
551 }
552 nm->method()->clear_code();
553 nm->set_speculatively_disconnected(true);
554 }
555
556
557 void CodeCache::gc_prologue() {
558 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
559 }
560
561
562 void CodeCache::gc_epilogue() {
563 assert_locked_or_safepoint(CodeCache_lock);
564 FOR_ALL_ALIVE_BLOBS(cb) {
565 if (cb->is_nmethod()) {
566 nmethod *nm = (nmethod*)cb;
567 assert(!nm->is_unloaded(), "Tautology");
568 if (needs_cache_clean()) {
569 nm->cleanup_inline_caches();
570 }
571 DEBUG_ONLY(nm->verify());
572 nm->fix_oop_relocations();
573 }
574 }
575 set_needs_cache_clean(false);
576 prune_scavenge_root_nmethods();
577 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
578
579 #ifdef ASSERT
580 // make sure that we aren't leaking icholders
581 int count = 0;
582 FOR_ALL_BLOBS(cb) {
583 if (cb->is_nmethod()) {
584 RelocIterator iter((nmethod*)cb);
585 while(iter.next()) {
586 if (iter.type() == relocInfo::virtual_call_type) {
587 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
588 CompiledIC *ic = CompiledIC_at(iter.reloc());
589 if (TraceCompiledIC) {
590 tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder());
591 ic->print();
592 }
593 assert(ic->cached_icholder() != NULL, "must be non-NULL");
594 count++;
595 }
596 }
597 }
598 }
599 }
600
601 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
602 CompiledICHolder::live_count(), "must agree");
603 #endif
604 }
605
606
607 void CodeCache::verify_oops() {
608 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
609 VerifyOopClosure voc;
610 FOR_ALL_ALIVE_BLOBS(cb) {
611 if (cb->is_nmethod()) {
612 nmethod *nm = (nmethod*)cb;
613 nm->oops_do(&voc);
614 nm->verify_oop_relocations();
615 }
616 }
617 }
618
619
620 address CodeCache::first_address() {
621 assert_locked_or_safepoint(CodeCache_lock);
622 return (address)_heap->low_boundary();
623 }
624
625
626 address CodeCache::last_address() {
627 assert_locked_or_safepoint(CodeCache_lock);
628 return (address)_heap->high();
629 }
630
631 /**
632 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
633 * is free, reverse_free_ratio() returns 4.
634 */
635 double CodeCache::reverse_free_ratio() {
636 double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace);
637 double max_capacity = (double)CodeCache::max_capacity();
638 return max_capacity / unallocated_capacity;
639 }
640
641 void icache_init();
642
643 void CodeCache::initialize() {
644 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
645 #ifdef COMPILER2
646 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
647 #endif
648 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
649 // This was originally just a check of the alignment, causing failure, instead, round
650 // the code cache to the page size. In particular, Solaris is moving to a larger
651 // default page size.
652 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
653 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
654 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
655 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
656 vm_exit_during_initialization("Could not reserve enough space for code cache");
657 }
658
659 MemoryService::add_code_heap_memory_pool(_heap);
660
661 // Initialize ICache flush mechanism
662 // This service is needed for os::register_code_area
663 icache_init();
664
665 // Give OS a chance to register generated code area.
666 // This is used on Windows 64 bit platforms to register
667 // Structured Exception Handlers for our generated code.
668 os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
669 }
670
671
672 void codeCache_init() {
673 CodeCache::initialize();
674 }
675
676 //------------------------------------------------------------------------------------------------
677
678 int CodeCache::number_of_nmethods_with_dependencies() {
679 return _number_of_nmethods_with_dependencies;
680 }
681
682 void CodeCache::clear_inline_caches() {
683 assert_locked_or_safepoint(CodeCache_lock);
684 FOR_ALL_ALIVE_NMETHODS(nm) {
685 nm->clear_inline_caches();
686 }
687 }
688
689 #ifndef PRODUCT
690 // used to keep track of how much time is spent in mark_for_deoptimization
691 static elapsedTimer dependentCheckTime;
692 static int dependentCheckCount = 0;
693 #endif // PRODUCT
694
695
696 int CodeCache::mark_for_deoptimization(DepChange& changes) {
697 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
698
699 #ifndef PRODUCT
700 dependentCheckTime.start();
701 dependentCheckCount++;
702 #endif // PRODUCT
703
704 int number_of_marked_CodeBlobs = 0;
705
706 // search the hierarchy looking for nmethods which are affected by the loading of this class
707
708 // then search the interfaces this class implements looking for nmethods
709 // which might be dependent of the fact that an interface only had one
710 // implementor.
711
712 { No_Safepoint_Verifier nsv;
713 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
714 Klass* d = str.klass();
715 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
716 }
717 }
718
719 if (VerifyDependencies) {
720 // Turn off dependency tracing while actually testing deps.
721 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
722 FOR_ALL_ALIVE_NMETHODS(nm) {
723 if (!nm->is_marked_for_deoptimization() &&
724 nm->check_all_dependencies()) {
725 ResourceMark rm;
726 tty->print_cr("Should have been marked for deoptimization:");
727 changes.print();
728 nm->print();
729 nm->print_dependencies();
730 }
731 }
732 }
733
734 #ifndef PRODUCT
735 dependentCheckTime.stop();
736 #endif // PRODUCT
737
738 return number_of_marked_CodeBlobs;
739 }
740
741
742 #ifdef HOTSWAP
743 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
744 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
745 int number_of_marked_CodeBlobs = 0;
746
747 // Deoptimize all methods of the evolving class itself
748 Array<Method*>* old_methods = dependee->methods();
749 for (int i = 0; i < old_methods->length(); i++) {
750 ResourceMark rm;
751 Method* old_method = old_methods->at(i);
752 nmethod *nm = old_method->code();
753 if (nm != NULL) {
754 nm->mark_for_deoptimization();
755 number_of_marked_CodeBlobs++;
756 }
757 }
758
759 FOR_ALL_ALIVE_NMETHODS(nm) {
760 if (nm->is_marked_for_deoptimization()) {
761 // ...Already marked in the previous pass; don't count it again.
762 } else if (nm->is_evol_dependent_on(dependee())) {
763 ResourceMark rm;
764 nm->mark_for_deoptimization();
765 number_of_marked_CodeBlobs++;
766 } else {
767 // flush caches in case they refer to a redefined Method*
768 nm->clear_inline_caches();
769 }
770 }
771
772 return number_of_marked_CodeBlobs;
773 }
774 #endif // HOTSWAP
775
776
777 // Deoptimize all methods
778 void CodeCache::mark_all_nmethods_for_deoptimization() {
779 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
780 FOR_ALL_ALIVE_NMETHODS(nm) {
781 nm->mark_for_deoptimization();
782 }
783 }
784
785
786 int CodeCache::mark_for_deoptimization(Method* dependee) {
787 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
788 int number_of_marked_CodeBlobs = 0;
789
790 FOR_ALL_ALIVE_NMETHODS(nm) {
791 if (nm->is_dependent_on_method(dependee)) {
792 ResourceMark rm;
793 nm->mark_for_deoptimization();
794 number_of_marked_CodeBlobs++;
795 }
796 }
797
798 return number_of_marked_CodeBlobs;
799 }
800
801 void CodeCache::make_marked_nmethods_zombies() {
802 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
803 FOR_ALL_ALIVE_NMETHODS(nm) {
804 if (nm->is_marked_for_deoptimization()) {
805
806 // If the nmethod has already been made non-entrant and it can be converted
807 // then zombie it now. Otherwise make it non-entrant and it will eventually
808 // be zombied when it is no longer seen on the stack. Note that the nmethod
809 // might be "entrant" and not on the stack and so could be zombied immediately
810 // but we can't tell because we don't track it on stack until it becomes
811 // non-entrant.
812
813 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
814 nm->make_zombie();
815 } else {
816 nm->make_not_entrant();
817 }
818 }
819 }
820 }
821
822 void CodeCache::make_marked_nmethods_not_entrant() {
823 assert_locked_or_safepoint(CodeCache_lock);
824 FOR_ALL_ALIVE_NMETHODS(nm) {
825 if (nm->is_marked_for_deoptimization()) {
826 nm->make_not_entrant();
827 }
828 }
829 }
830
831 void CodeCache::verify() {
832 _heap->verify();
833 FOR_ALL_ALIVE_BLOBS(p) {
834 p->verify();
835 }
836 }
837
838 void CodeCache::report_codemem_full() {
839 _codemem_full_count++;
840 EventCodeCacheFull event;
841 if (event.should_commit()) {
842 event.set_startAddress((u8)low_bound());
843 event.set_commitedTopAddress((u8)high());
844 event.set_reservedTopAddress((u8)high_bound());
845 event.set_entryCount(nof_blobs());
846 event.set_methodCount(nof_nmethods());
847 event.set_adaptorCount(nof_adapters());
848 event.set_unallocatedCapacity(unallocated_capacity()/K);
849 event.set_fullCount(_codemem_full_count);
850 event.commit();
851 }
852 }
853
854 //------------------------------------------------------------------------------------------------
855 // Non-product version
856
857 #ifndef PRODUCT
858
859 void CodeCache::verify_if_often() {
860 if (VerifyCodeCacheOften) {
861 _heap->verify();
862 }
863 }
864
865 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
866 if (PrintCodeCache2) { // Need to add a new flag
867 ResourceMark rm;
868 if (size == 0) size = cb->size();
869 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
870 }
871 }
872
873 void CodeCache::print_internals() {
874 int nmethodCount = 0;
875 int runtimeStubCount = 0;
876 int adapterCount = 0;
877 int deoptimizationStubCount = 0;
878 int uncommonTrapStubCount = 0;
879 int bufferBlobCount = 0;
880 int total = 0;
881 int nmethodAlive = 0;
882 int nmethodNotEntrant = 0;
883 int nmethodZombie = 0;
884 int nmethodUnloaded = 0;
885 int nmethodJava = 0;
886 int nmethodNative = 0;
887 int maxCodeSize = 0;
888 ResourceMark rm;
889
890 CodeBlob *cb;
891 for (cb = first(); cb != NULL; cb = next(cb)) {
892 total++;
893 if (cb->is_nmethod()) {
894 nmethod* nm = (nmethod*)cb;
895
896 if (Verbose && nm->method() != NULL) {
897 ResourceMark rm;
898 char *method_name = nm->method()->name_and_sig_as_C_string();
899 tty->print("%s", method_name);
900 if(nm->is_alive()) { tty->print_cr(" alive"); }
901 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
902 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
903 }
904
905 nmethodCount++;
906
907 if(nm->is_alive()) { nmethodAlive++; }
908 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
909 if(nm->is_zombie()) { nmethodZombie++; }
910 if(nm->is_unloaded()) { nmethodUnloaded++; }
911 if(nm->is_native_method()) { nmethodNative++; }
912
913 if(nm->method() != NULL && nm->is_java_method()) {
914 nmethodJava++;
915 if (nm->insts_size() > maxCodeSize) {
916 maxCodeSize = nm->insts_size();
917 }
918 }
919 } else if (cb->is_runtime_stub()) {
920 runtimeStubCount++;
921 } else if (cb->is_deoptimization_stub()) {
922 deoptimizationStubCount++;
923 } else if (cb->is_uncommon_trap_stub()) {
924 uncommonTrapStubCount++;
925 } else if (cb->is_adapter_blob()) {
926 adapterCount++;
927 } else if (cb->is_buffer_blob()) {
928 bufferBlobCount++;
929 }
930 }
931
932 int bucketSize = 512;
933 int bucketLimit = maxCodeSize / bucketSize + 1;
934 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
935 memset(buckets,0,sizeof(int) * bucketLimit);
936
937 for (cb = first(); cb != NULL; cb = next(cb)) {
938 if (cb->is_nmethod()) {
939 nmethod* nm = (nmethod*)cb;
940 if(nm->is_java_method()) {
941 buckets[nm->insts_size() / bucketSize]++;
942 }
943 }
944 }
945 tty->print_cr("Code Cache Entries (total of %d)",total);
946 tty->print_cr("-------------------------------------------------");
947 tty->print_cr("nmethods: %d",nmethodCount);
948 tty->print_cr("\talive: %d",nmethodAlive);
949 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
950 tty->print_cr("\tzombie: %d",nmethodZombie);
951 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
952 tty->print_cr("\tjava: %d",nmethodJava);
953 tty->print_cr("\tnative: %d",nmethodNative);
954 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
955 tty->print_cr("adapters: %d",adapterCount);
956 tty->print_cr("buffer blobs: %d",bufferBlobCount);
957 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
958 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
959 tty->print_cr("\nnmethod size distribution (non-zombie java)");
960 tty->print_cr("-------------------------------------------------");
961
962 for(int i=0; i<bucketLimit; i++) {
963 if(buckets[i] != 0) {
964 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
965 tty->fill_to(40);
966 tty->print_cr("%d",buckets[i]);
967 }
968 }
969
970 FREE_C_HEAP_ARRAY(int, buckets, mtCode);
971 }
972
973 #endif // !PRODUCT
974
975 void CodeCache::print() {
976 print_summary(tty);
977
978 CodeBlob_sizes live_java_methods [CompLevel_full_optimization + 1];
979 CodeBlob_sizes live_osr_methods [CompLevel_full_optimization + 1];
980 CodeBlob_sizes live_native_methods;
981
982 CodeBlob_sizes dead_java_methods [CompLevel_full_optimization + 1];
983 CodeBlob_sizes dead_osr_methods [CompLevel_full_optimization + 1];
984 CodeBlob_sizes dead_native_methods;
985
986 CodeBlob_sizes runtime_stubs;
987 CodeBlob_sizes deoptimization_stubs;
988 CodeBlob_sizes uncommon_trap_stubs;
989 CodeBlob_sizes exception_stubs;
990 CodeBlob_sizes safepoint_stubs;
991 CodeBlob_sizes adapter_blobs;
992 CodeBlob_sizes method_handles_adapter_blobs;
993 CodeBlob_sizes other_stubs;
994
995 size_t total_live_nmethods = 0;
996 size_t total_dead_nmethods = 0;
997 size_t total_stubs_size = 0;
998
999 FOR_ALL_BLOBS(p) {
1000 // live or not-entrant methods
1001 if (p->is_alive()) {
1002 if (p->is_nmethod()) {
1003 total_live_nmethods++;
1004 // Cannot return NULL, since we checked that it is an nmethod
1005 nmethod* nm = p->as_nmethod_or_null();
1006 const int comp_level = nm->comp_level();
1007
1008 if (nm->is_osr_method()) {
1009 live_osr_methods[comp_level].add(nm);
1010 } else if (nm->is_native_method()) {
1011 live_native_methods.add(nm);
1012 } else if (nm->is_java_method()) {
1013 live_java_methods[comp_level].add(nm);
1014 }
1015 } else {
1016 total_stubs_size++;
1017 if (p->is_runtime_stub()) {
1018 runtime_stubs.add(p);
1019 } else if (p->is_deoptimization_stub()) {
1020 deoptimization_stubs.add(p);
1021 } else if (p->is_uncommon_trap_stub()) {
1022 uncommon_trap_stubs.add(p);
1023 } else if (p->is_exception_stub()) {
1024 exception_stubs.add(p);
1025 } else if (p->is_safepoint_stub()) {
1026 safepoint_stubs.add(p);
1027 } else if (p->is_adapter_blob()) {
1028 adapter_blobs.add(p);
1029 } else if (p->is_method_handles_adapter_blob()) {
1030 method_handles_adapter_blobs.add(p);
1031 } else {
1032 other_stubs.add(p);
1033 }
1034 }
1035 // zombie or unloaded methods
1036 } else {
1037 if (p->is_nmethod()) {
1038 total_dead_nmethods++;
1039 nmethod* nm = p->as_nmethod_or_null();
1040 const int comp_level = nm->comp_level();
1041
1042 if (nm->is_osr_method()) {
1043 dead_osr_methods[comp_level].add(nm);
1044 } else if (nm->is_native_method()) {
1045 dead_native_methods.add(nm);
1046 } else if (nm->is_java_method()) {
1047 dead_java_methods[comp_level].add(nm);
1048 }
1049 }
1050 }
1051 }
1052
1053 // Tier 0 (interpreter)
1054 StubQueue* code = AbstractInterpreter::code();
1055 tty->print("\nInterpreter:");
1056 tty->print_cr(" total=%dk, used=%dk", code->total_space() / K, code->used_space() / K);
1057
1058 // Print live methods
1059 tty->print_cr("\nTotal number of live methods: %u", total_live_nmethods);
1060 for (int i = 1; i < CompLevel_full_optimization + 1; i++) {
1061 tty->print_cr(" Tier %d:", i);
1062 live_java_methods[i].print("Java methods");
1063 live_osr_methods[i].print("OSR methods");
1064 }
1065 tty->print_cr(" Native methods:");
1066 live_native_methods.print("Native methods");
1067
1068 // Print dead methods
1069 tty->print_cr("\nTotal number of dead methods: %u", total_dead_nmethods);
1070 for (int i = 1; i < CompLevel_full_optimization + 1; i++) {
1071 tty->print_cr(" Tier %d:", i);
1072 dead_java_methods[i].print("Java methods");
1073 dead_osr_methods[i].print("OSR methods");
1074 }
1075 tty->print_cr(" Native methods:");
1076 dead_native_methods.print("Native methods");
1077
1078 // Print stubs
1079 tty->print_cr("\nTotal number of stubs: %u", total_stubs_size);
1080 runtime_stubs.print("runtime");
1081 deoptimization_stubs.print("deoptimization");
1082 uncommon_trap_stubs.print("uncommon trap");
1083 exception_stubs.print("exception");
1084 safepoint_stubs.print("safepoint");
1085 adapter_blobs.print("C2I/I2C adapter");
1086 method_handles_adapter_blobs.print("method handles adapter");
1087 other_stubs.print("other");
1088
1089 #ifndef PRODUCT
1090 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),
1091 dependentCheckTime.seconds() / dependentCheckCount);
1092 #endif
1093
1094 if (WizardMode) {
1095 // print the oop_map usage
1096 int code_size = 0;
1097 int number_of_blobs = 0;
1098 int number_of_oop_maps = 0;
1099 int map_size = 0;
1100 FOR_ALL_BLOBS(p) {
1101 if (p->is_alive()) {
1102 number_of_blobs++;
1103 code_size += p->code_size();
1104 OopMapSet* set = p->oop_maps();
1105 if (set != NULL) {
1106 number_of_oop_maps += set->size();
1107 map_size += set->heap_size();
1108 }
1109 }
1110 }
1111 tty->print_cr("OopMaps");
1112 tty->print_cr(" #blobs = %d", number_of_blobs);
1113 tty->print_cr(" code size = %d", code_size);
1114 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
1115 tty->print_cr(" map size = %d", map_size);
1116 }
1117 }
1118
1119 void CodeCache::print_summary(outputStream* st, bool detailed) {
1120 size_t total = (_heap->high_boundary() - _heap->low_boundary());
1121 st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
1122 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
1123 total/K, (total - unallocated_capacity())/K,
1124 maxCodeCacheUsed/K, unallocated_capacity()/K);
1125
1126 if (detailed) {
1127 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
1128 _heap->low_boundary(),
1129 _heap->high(),
1130 _heap->high_boundary());
1131 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
1132 " adapters=" UINT32_FORMAT,
1133 nof_blobs(), nof_nmethods(), nof_adapters());
1134 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
1135 "enabled" : Arguments::mode() == Arguments::_int ?
1136 "disabled (interpreter mode)" :
1137 "disabled (not enough contiguous free space left)");
1138 }
1139 }
1140
1141 void CodeCache::log_state(outputStream* st) {
1142 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
1143 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
1144 nof_blobs(), nof_nmethods(), nof_adapters(),
1145 unallocated_capacity());
1146 }
1147