1 /*
2 * Copyright (c) 1997, 2026, 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 "asm/assembler.inline.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.inline.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "compiler/oopMap.inline.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/barrierSetNMethod.hpp"
45 #include "gc/shared/classUnloadingContext.hpp"
46 #include "gc/shared/collectedHeap.hpp"
47 #include "interpreter/bytecode.inline.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/weakHandle.inline.hpp"
60 #include "prims/jvmtiImpl.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/atomicAccess.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #ifdef COMPILER2
70 #include "runtime/hotCodeCollector.hpp"
71 #endif // COMPILER2
72 #include "runtime/icache.hpp"
73 #include "runtime/jniHandles.inline.hpp"
74 #include "runtime/orderAccess.hpp"
75 #include "runtime/os.hpp"
76 #include "runtime/safepointVerifiers.hpp"
77 #include "runtime/serviceThread.hpp"
78 #include "runtime/sharedRuntime.hpp"
79 #include "runtime/signature.hpp"
80 #include "runtime/threadWXSetters.inline.hpp"
81 #include "runtime/vmThread.hpp"
82 #include "utilities/align.hpp"
83 #include "utilities/copy.hpp"
84 #include "utilities/dtrace.hpp"
85 #include "utilities/events.hpp"
86 #include "utilities/globalDefinitions.hpp"
87 #include "utilities/hashTable.hpp"
88 #include "utilities/xmlstream.hpp"
89
90 #ifdef DTRACE_ENABLED
91
92 // Only bother with this argument setup if dtrace is available
93
94 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
95 { \
96 Method* m = (method); \
97 if (m != nullptr) { \
98 Symbol* klass_name = m->klass_name(); \
99 Symbol* name = m->name(); \
100 Symbol* signature = m->signature(); \
101 HOTSPOT_COMPILED_METHOD_UNLOAD( \
102 (char *) klass_name->bytes(), klass_name->utf8_length(), \
103 (char *) name->bytes(), name->utf8_length(), \
104 (char *) signature->bytes(), signature->utf8_length()); \
105 } \
106 }
107
108 #else // ndef DTRACE_ENABLED
109
110 #define DTRACE_METHOD_UNLOAD_PROBE(method)
111
112 #endif
113
114 // Cast from int value to narrow type
115 #define CHECKED_CAST(result, T, thing) \
116 result = static_cast<T>(thing); \
117 guarantee(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing);
118
119 //---------------------------------------------------------------------------------
120 // NMethod statistics
121 // They are printed under various flags, including:
122 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
123 // (In the latter two cases, they like other stats are printed to the log only.)
124
125 #ifndef PRODUCT
126 // These variables are put into one block to reduce relocations
127 // and make it simpler to print from the debugger.
128 struct java_nmethod_stats_struct {
129 uint nmethod_count;
130 uint total_nm_size;
131 uint total_immut_size;
132 uint total_mut_size;
133 uint relocation_size;
134 uint consts_size;
135 uint insts_size;
136 uint stub_size;
137 uint oops_size;
138 uint metadata_size;
139 uint dependencies_size;
140 uint nul_chk_table_size;
141 uint handler_table_size;
142 uint scopes_pcs_size;
143 uint scopes_data_size;
144
145 void note_nmethod(nmethod* nm) {
146 nmethod_count += 1;
147 total_nm_size += nm->size();
148 total_immut_size += nm->immutable_data_size();
149 total_mut_size += nm->mutable_data_size();
150 relocation_size += nm->relocation_size();
151 consts_size += nm->consts_size();
152 insts_size += nm->insts_size();
153 stub_size += nm->stub_size();
154 oops_size += nm->oops_size();
155 metadata_size += nm->metadata_size();
156 scopes_data_size += nm->scopes_data_size();
157 scopes_pcs_size += nm->scopes_pcs_size();
158 dependencies_size += nm->dependencies_size();
159 handler_table_size += nm->handler_table_size();
160 nul_chk_table_size += nm->nul_chk_table_size();
161 }
162 void print_nmethod_stats(const char* name) {
163 if (nmethod_count == 0) return;
164 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
165 uint total_size = total_nm_size + total_immut_size + total_mut_size;
166 if (total_nm_size != 0) {
167 tty->print_cr(" total size = %u (100%%)", total_size);
168 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
169 }
170 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
171 if (nmethod_count != 0) {
172 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
173 }
174 if (consts_size != 0) {
175 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
176 }
177 if (insts_size != 0) {
178 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
179 }
180 if (stub_size != 0) {
181 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
182 }
183 if (oops_size != 0) {
184 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
185 }
186 if (total_mut_size != 0) {
187 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
188 }
189 if (relocation_size != 0) {
190 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
191 }
192 if (metadata_size != 0) {
193 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
194 }
195 if (total_immut_size != 0) {
196 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
197 }
198 if (dependencies_size != 0) {
199 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
200 }
201 if (nul_chk_table_size != 0) {
202 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
203 }
204 if (handler_table_size != 0) {
205 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
206 }
207 if (scopes_pcs_size != 0) {
208 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
209 }
210 if (scopes_data_size != 0) {
211 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
212 }
213 }
214 };
215
216 struct native_nmethod_stats_struct {
217 uint native_nmethod_count;
218 uint native_total_size;
219 uint native_relocation_size;
220 uint native_insts_size;
221 uint native_oops_size;
222 uint native_metadata_size;
223 void note_native_nmethod(nmethod* nm) {
224 native_nmethod_count += 1;
225 native_total_size += nm->size();
226 native_relocation_size += nm->relocation_size();
227 native_insts_size += nm->insts_size();
228 native_oops_size += nm->oops_size();
229 native_metadata_size += nm->metadata_size();
230 }
231 void print_native_nmethod_stats() {
232 if (native_nmethod_count == 0) return;
233 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
234 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
235 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
236 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
237 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
238 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
239 }
240 };
241
242 struct pc_nmethod_stats_struct {
243 uint pc_desc_init; // number of initialization of cache (= number of caches)
244 uint pc_desc_queries; // queries to nmethod::find_pc_desc
245 uint pc_desc_approx; // number of those which have approximate true
246 uint pc_desc_repeats; // number of _pc_descs[0] hits
247 uint pc_desc_hits; // number of LRU cache hits
248 uint pc_desc_tests; // total number of PcDesc examinations
249 uint pc_desc_searches; // total number of quasi-binary search steps
250 uint pc_desc_adds; // number of LUR cache insertions
251
252 void print_pc_stats() {
253 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
254 pc_desc_queries,
255 (double)(pc_desc_tests + pc_desc_searches)
256 / pc_desc_queries);
257 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
258 pc_desc_init,
259 pc_desc_queries, pc_desc_approx,
260 pc_desc_repeats, pc_desc_hits,
261 pc_desc_tests, pc_desc_searches, pc_desc_adds);
262 }
263 };
264
265 #ifdef COMPILER1
266 static java_nmethod_stats_struct c1_java_nmethod_stats;
267 #endif
268 #ifdef COMPILER2
269 static java_nmethod_stats_struct c2_java_nmethod_stats;
270 #endif
271 static java_nmethod_stats_struct unknown_java_nmethod_stats;
272
273 static native_nmethod_stats_struct native_nmethod_stats;
274 static pc_nmethod_stats_struct pc_nmethod_stats;
275
276 static void note_java_nmethod(nmethod* nm) {
277 #ifdef COMPILER1
278 if (nm->is_compiled_by_c1()) {
279 c1_java_nmethod_stats.note_nmethod(nm);
280 } else
281 #endif
282 #ifdef COMPILER2
283 if (nm->is_compiled_by_c2()) {
284 c2_java_nmethod_stats.note_nmethod(nm);
285 } else
286 #endif
287 {
288 unknown_java_nmethod_stats.note_nmethod(nm);
289 }
290 }
291 #endif // !PRODUCT
292
293 //---------------------------------------------------------------------------------
294
295
296 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
297 assert(pc != nullptr, "Must be non null");
298 assert(exception.not_null(), "Must be non null");
299 assert(handler != nullptr, "Must be non null");
300
301 _count = 0;
302 _exception_type = exception->klass();
303 _next = nullptr;
304 _purge_list_next = nullptr;
305
306 add_address_and_handler(pc,handler);
307 }
308
309
310 address ExceptionCache::match(Handle exception, address pc) {
311 assert(pc != nullptr,"Must be non null");
312 assert(exception.not_null(),"Must be non null");
313 if (exception->klass() == exception_type()) {
314 return (test_address(pc));
315 }
316
317 return nullptr;
318 }
319
320
321 bool ExceptionCache::match_exception_with_space(Handle exception) {
322 assert(exception.not_null(),"Must be non null");
323 if (exception->klass() == exception_type() && count() < cache_size) {
324 return true;
325 }
326 return false;
327 }
328
329
330 address ExceptionCache::test_address(address addr) {
331 int limit = count();
332 for (int i = 0; i < limit; i++) {
333 if (pc_at(i) == addr) {
334 return handler_at(i);
335 }
336 }
337 return nullptr;
338 }
339
340
341 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
342 if (test_address(addr) == handler) return true;
343
344 int index = count();
345 if (index < cache_size) {
346 set_pc_at(index, addr);
347 set_handler_at(index, handler);
348 increment_count();
349 return true;
350 }
351 return false;
352 }
353
354 ExceptionCache* ExceptionCache::next() {
355 return AtomicAccess::load(&_next);
356 }
357
358 void ExceptionCache::set_next(ExceptionCache *ec) {
359 AtomicAccess::store(&_next, ec);
360 }
361
362 //-----------------------------------------------------------------------------
363
364
365 // Helper used by both find_pc_desc methods.
366 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
368 if (!approximate) {
369 return pc->pc_offset() == pc_offset;
370 } else {
371 // Do not look before the sentinel
372 assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
373 return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
374 }
375 }
376
377 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
378 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
379 // initialize the cache by filling it with benign (non-null) values
380 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
381 "must start with a sentinel");
382 for (int i = 0; i < cache_size; i++) {
383 _pc_descs[i] = initial_pc_desc;
384 }
385 }
386
387 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
388 // Note: one might think that caching the most recently
389 // read value separately would be a win, but one would be
390 // wrong. When many threads are updating it, the cache
391 // line it's in would bounce between caches, negating
392 // any benefit.
393
394 // In order to prevent race conditions do not load cache elements
395 // repeatedly, but use a local copy:
396 PcDesc* res;
397
398 // Step one: Check the most recently added value.
399 res = _pc_descs[0];
400 assert(res != nullptr, "PcDesc cache should be initialized already");
401
402 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
403 if (approximate && match_desc(res, pc_offset, approximate)) {
404 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
405 return res;
406 }
407
408 // Step two: Check the rest of the LRU cache.
409 for (int i = 1; i < cache_size; ++i) {
410 res = _pc_descs[i];
411 if (res->pc_offset() < 0) break; // optimization: skip empty cache
412 if (match_desc(res, pc_offset, approximate)) {
413 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
414 return res;
415 }
416 }
417
418 // Report failure.
419 return nullptr;
420 }
421
422 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
423 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
424 // Update the LRU cache by shifting pc_desc forward.
425 for (int i = 0; i < cache_size; i++) {
426 PcDesc* next = _pc_descs[i];
427 _pc_descs[i] = pc_desc;
428 pc_desc = next;
429 }
430 }
431
432 // adjust pcs_size so that it is a multiple of both oopSize and
433 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
434 // of oopSize, then 2*sizeof(PcDesc) is)
435 static int adjust_pcs_size(int pcs_size) {
436 int nsize = align_up(pcs_size, oopSize);
437 if ((nsize % sizeof(PcDesc)) != 0) {
438 nsize = pcs_size + sizeof(PcDesc);
439 }
440 assert((nsize % oopSize) == 0, "correct alignment");
441 return nsize;
442 }
443
444 // Returns a string version of the method state.
445 const char* nmethod::state() const {
446 int state = get_state();
447 switch (state) {
448 case not_installed:
449 return "not installed";
450 case in_use:
451 return "in use";
452 case not_entrant:
453 return "not_entrant";
454 default:
455 fatal("unexpected method state: %d", state);
456 return nullptr;
457 }
458 }
459
460 void nmethod::set_deoptimized_done() {
461 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
462 if (_deoptimization_status != deoptimize_done) { // can't go backwards
463 AtomicAccess::store(&_deoptimization_status, deoptimize_done);
464 }
465 }
466
467 ExceptionCache* nmethod::exception_cache_acquire() const {
468 return AtomicAccess::load_acquire(&_exception_cache);
469 }
470
471 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
472 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
473 assert(new_entry != nullptr,"Must be non null");
474 assert(new_entry->next() == nullptr, "Must be null");
475
476 for (;;) {
477 ExceptionCache *ec = exception_cache();
478 if (ec != nullptr) {
479 Klass* ex_klass = ec->exception_type();
480 if (!ex_klass->is_loader_alive()) {
481 // We must guarantee that entries are not inserted with new next pointer
482 // edges to ExceptionCache entries with dead klasses, due to bad interactions
483 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
484 // the head pointer forward to the first live ExceptionCache, so that the new
485 // next pointers always point at live ExceptionCaches, that are not removed due
486 // to concurrent ExceptionCache cleanup.
487 ExceptionCache* next = ec->next();
488 if (AtomicAccess::cmpxchg(&_exception_cache, ec, next) == ec) {
489 CodeCache::release_exception_cache(ec);
490 }
491 continue;
492 }
493 ec = exception_cache();
494 if (ec != nullptr) {
495 new_entry->set_next(ec);
496 }
497 }
498 if (AtomicAccess::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
499 return;
500 }
501 }
502 }
503
504 void nmethod::clean_exception_cache() {
505 // For each nmethod, only a single thread may call this cleanup function
506 // at the same time, whether called in STW cleanup or concurrent cleanup.
507 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
508 // then a single writer may contend with cleaning up the head pointer to the
509 // first ExceptionCache node that has a Klass* that is alive. That is fine,
510 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
511 // And the concurrent writers do not clean up next pointers, only the head.
512 // Also note that concurrent readers will walk through Klass* pointers that are not
513 // alive. That does not cause ABA problems, because Klass* is deleted after
514 // a handshake with all threads, after all stale ExceptionCaches have been
515 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
516 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
517 // That similarly implies that CAS operations on ExceptionCache entries do not
518 // suffer from ABA problems as unlinking and deletion is separated by a global
519 // handshake operation.
520 ExceptionCache* prev = nullptr;
521 ExceptionCache* curr = exception_cache_acquire();
522
523 while (curr != nullptr) {
524 ExceptionCache* next = curr->next();
525
526 if (!curr->exception_type()->is_loader_alive()) {
527 if (prev == nullptr) {
528 // Try to clean head; this is contended by concurrent inserts, that
529 // both lazily clean the head, and insert entries at the head. If
530 // the CAS fails, the operation is restarted.
531 if (AtomicAccess::cmpxchg(&_exception_cache, curr, next) != curr) {
532 prev = nullptr;
533 curr = exception_cache_acquire();
534 continue;
535 }
536 } else {
537 // It is impossible to during cleanup connect the next pointer to
538 // an ExceptionCache that has not been published before a safepoint
539 // prior to the cleanup. Therefore, release is not required.
540 prev->set_next(next);
541 }
542 // prev stays the same.
543
544 CodeCache::release_exception_cache(curr);
545 } else {
546 prev = curr;
547 }
548
549 curr = next;
550 }
551 }
552
553 // public method for accessing the exception cache
554 // These are the public access methods.
555 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
556 // We never grab a lock to read the exception cache, so we may
557 // have false negatives. This is okay, as it can only happen during
558 // the first few exception lookups for a given nmethod.
559 ExceptionCache* ec = exception_cache_acquire();
560 while (ec != nullptr) {
561 address ret_val;
562 if ((ret_val = ec->match(exception,pc)) != nullptr) {
563 return ret_val;
564 }
565 ec = ec->next();
566 }
567 return nullptr;
568 }
569
570 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
571 // There are potential race conditions during exception cache updates, so we
572 // must own the ExceptionCache_lock before doing ANY modifications. Because
573 // we don't lock during reads, it is possible to have several threads attempt
574 // to update the cache with the same data. We need to check for already inserted
575 // copies of the current data before adding it.
576
577 MutexLocker ml(ExceptionCache_lock);
578 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
579
580 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
581 target_entry = new ExceptionCache(exception,pc,handler);
582 add_exception_cache_entry(target_entry);
583 }
584 }
585
586 // private method for handling exception cache
587 // These methods are private, and used to manipulate the exception cache
588 // directly.
589 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
590 ExceptionCache* ec = exception_cache_acquire();
591 while (ec != nullptr) {
592 if (ec->match_exception_with_space(exception)) {
593 return ec;
594 }
595 ec = ec->next();
596 }
597 return nullptr;
598 }
599
600 bool nmethod::is_at_poll_return(address pc) {
601 RelocIterator iter(this, pc, pc+1);
602 while (iter.next()) {
603 if (iter.type() == relocInfo::poll_return_type)
604 return true;
605 }
606 return false;
607 }
608
609
610 bool nmethod::is_at_poll_or_poll_return(address pc) {
611 RelocIterator iter(this, pc, pc+1);
612 while (iter.next()) {
613 relocInfo::relocType t = iter.type();
614 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
615 return true;
616 }
617 return false;
618 }
619
620 void nmethod::verify_oop_relocations() {
621 // Ensure sure that the code matches the current oop values
622 RelocIterator iter(this, nullptr, nullptr);
623 while (iter.next()) {
624 if (iter.type() == relocInfo::oop_type) {
625 oop_Relocation* reloc = iter.oop_reloc();
626 if (!reloc->oop_is_immediate()) {
627 reloc->verify_oop_relocation();
628 }
629 }
630 }
631 }
632
633
634 ScopeDesc* nmethod::scope_desc_at(address pc) {
635 PcDesc* pd = pc_desc_at(pc);
636 guarantee(pd != nullptr, "scope must be present");
637 return new ScopeDesc(this, pd);
638 }
639
640 ScopeDesc* nmethod::scope_desc_near(address pc) {
641 PcDesc* pd = pc_desc_near(pc);
642 guarantee(pd != nullptr, "scope must be present");
643 return new ScopeDesc(this, pd);
644 }
645
646 address nmethod::oops_reloc_begin() const {
647 // If the method is not entrant then a JMP is plastered over the
648 // first few bytes. If an oop in the old code was there, that oop
649 // should not get GC'd. Skip the first few bytes of oops on
650 // not-entrant methods.
651 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
652 code_begin() + frame_complete_offset() >
653 verified_entry_point() + NativeJump::instruction_size)
654 {
655 // If we have a frame_complete_offset after the native jump, then there
656 // is no point trying to look for oops before that. This is a requirement
657 // for being allowed to scan oops concurrently.
658 return code_begin() + frame_complete_offset();
659 }
660
661 address low_boundary = verified_entry_point();
662 return low_boundary;
663 }
664
665 // Method that knows how to preserve outgoing arguments at call. This method must be
666 // called with a frame corresponding to a Java invoke
667 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
668 if (method() == nullptr) {
669 return;
670 }
671
672 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
673 JavaThread* thread = reg_map->thread();
674 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
675 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
676 return;
677 }
678
679 if (!method()->is_native()) {
680 address pc = fr.pc();
681 bool has_receiver, has_appendix;
682 Symbol* signature;
683
684 // The method attached by JIT-compilers should be used, if present.
685 // Bytecode can be inaccurate in such case.
686 Method* callee = attached_method_before_pc(pc);
687 if (callee != nullptr) {
688 has_receiver = !(callee->access_flags().is_static());
689 has_appendix = false;
690 signature = callee->signature();
691 } else {
692 SimpleScopeDesc ssd(this, pc);
693
694 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
695 has_receiver = call.has_receiver();
696 has_appendix = call.has_appendix();
697 signature = call.signature();
698 }
699
700 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
701 } else if (method()->is_continuation_enter_intrinsic()) {
702 // This method only calls Continuation.enter()
703 Symbol* signature = vmSymbols::continuationEnter_signature();
704 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
705 }
706 }
707
708 Method* nmethod::attached_method(address call_instr) {
709 assert(code_contains(call_instr), "not part of the nmethod");
710 RelocIterator iter(this, call_instr, call_instr + 1);
711 while (iter.next()) {
712 if (iter.addr() == call_instr) {
713 switch(iter.type()) {
714 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
715 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
716 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
717 default: break;
718 }
719 }
720 }
721 return nullptr; // not found
722 }
723
724 Method* nmethod::attached_method_before_pc(address pc) {
725 if (NativeCall::is_call_before(pc)) {
726 NativeCall* ncall = nativeCall_before(pc);
727 return attached_method(ncall->instruction_address());
728 }
729 return nullptr; // not a call
730 }
731
732 void nmethod::clear_inline_caches() {
733 assert(SafepointSynchronize::is_at_safepoint() || (NMethodState_lock->owned_by_self() && is_not_installed()), "clearing of IC's only allowed at safepoint or when not installed");
734 RelocIterator iter(this);
735 while (iter.next()) {
736 iter.reloc()->clear_inline_cache();
737 }
738 }
739
740 #ifdef ASSERT
741 // Check class_loader is alive for this bit of metadata.
742 class CheckClass : public MetadataClosure {
743 void do_metadata(Metadata* md) {
744 Klass* klass = nullptr;
745 if (md->is_klass()) {
746 klass = ((Klass*)md);
747 } else if (md->is_method()) {
748 klass = ((Method*)md)->method_holder();
749 } else if (md->is_methodData()) {
750 klass = ((MethodData*)md)->method()->method_holder();
751 } else if (md->is_methodCounters()) {
752 klass = ((MethodCounters*)md)->method()->method_holder();
753 } else {
754 md->print();
755 ShouldNotReachHere();
756 }
757 assert(klass->is_loader_alive(), "must be alive");
758 }
759 };
760 #endif // ASSERT
761
762 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
763 template <typename CallsiteT>
764 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, bool clean_all) {
765 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
766 if (!cb->is_nmethod()) {
767 return;
768 }
769 nmethod* nm = cb->as_nmethod();
770 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
771 callsite->set_to_clean();
772 }
773 }
774
775 // Cleans caches in nmethods that point to either classes that are unloaded
776 // or nmethods that are unloaded.
777 //
778 // Can be called either in parallel by G1 currently or after all
779 // nmethods are unloaded. Return postponed=true in the parallel case for
780 // inline caches found that point to nmethods that are not yet visited during
781 // the do_unloading walk.
782 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
783 ResourceMark rm;
784
785 // Exception cache only needs to be called if unloading occurred
786 if (unloading_occurred) {
787 clean_exception_cache();
788 }
789
790 cleanup_inline_caches_impl(unloading_occurred, false);
791
792 #ifdef ASSERT
793 // Check that the metadata embedded in the nmethod is alive
794 CheckClass check_class;
795 metadata_do(&check_class);
796 #endif
797 }
798
799 void nmethod::run_nmethod_entry_barrier() {
800 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
801 if (bs_nm != nullptr) {
802 // We want to keep an invariant that nmethods found through iterations of a Thread's
803 // nmethods found in safepoints have gone through an entry barrier and are not armed.
804 // By calling this nmethod entry barrier, it plays along and acts
805 // like any other nmethod found on the stack of a thread (fewer surprises).
806 nmethod* nm = this;
807 bool alive = bs_nm->nmethod_entry_barrier(nm);
808 assert(alive, "should be alive");
809 }
810 }
811
812 // Only called by whitebox test
813 void nmethod::cleanup_inline_caches_whitebox() {
814 assert_locked_or_safepoint(CodeCache_lock);
815 CompiledICLocker ic_locker(this);
816 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
817 }
818
819 address* nmethod::orig_pc_addr(const frame* fr) {
820 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
821 }
822
823 // Called to clean up after class unloading for live nmethods
824 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
825 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
826 ResourceMark rm;
827
828 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
829 RelocIterator iter(this, oops_reloc_begin());
830 bool is_in_static_stub = false;
831 while(iter.next()) {
832
833 switch (iter.type()) {
834
835 case relocInfo::virtual_call_type:
836 if (unloading_occurred) {
837 // If class unloading occurred we first clear ICs where the cached metadata
838 // is referring to an unloaded klass or method.
839 CompiledIC_at(&iter)->clean_metadata();
840 }
841
842 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), clean_all);
843 break;
844
845 case relocInfo::opt_virtual_call_type:
846 case relocInfo::static_call_type:
847 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), clean_all);
848 break;
849
850 case relocInfo::static_stub_type: {
851 is_in_static_stub = true;
852 break;
853 }
854
855 case relocInfo::metadata_type: {
856 // Only the metadata relocations contained in static/opt virtual call stubs
857 // contains the Method* passed to c2i adapters. It is the only metadata
858 // relocation that needs to be walked, as it is the one metadata relocation
859 // that violates the invariant that all metadata relocations have an oop
860 // in the compiled method (due to deferred resolution and code patching).
861
862 // This causes dead metadata to remain in compiled methods that are not
863 // unloading. Unless these slippery metadata relocations of the static
864 // stubs are at least cleared, subsequent class redefinition operations
865 // will access potentially free memory, and JavaThread execution
866 // concurrent to class unloading may call c2i adapters with dead methods.
867 if (!is_in_static_stub) {
868 // The first metadata relocation after a static stub relocation is the
869 // metadata relocation of the static stub used to pass the Method* to
870 // c2i adapters.
871 continue;
872 }
873 is_in_static_stub = false;
874 if (is_unloading()) {
875 // If the nmethod itself is dying, then it may point at dead metadata.
876 // Nobody should follow that metadata; it is strictly unsafe.
877 continue;
878 }
879 metadata_Relocation* r = iter.metadata_reloc();
880 Metadata* md = r->metadata_value();
881 if (md != nullptr && md->is_method()) {
882 Method* method = static_cast<Method*>(md);
883 if (!method->method_holder()->is_loader_alive()) {
884 AtomicAccess::store(r->metadata_addr(), (Method*)nullptr);
885
886 if (!r->metadata_is_immediate()) {
887 r->fix_metadata_relocation();
888 }
889 }
890 }
891 break;
892 }
893
894 default:
895 break;
896 }
897 }
898 }
899
900 address nmethod::continuation_for_implicit_exception(address pc) {
901 // Exception happened outside inline-cache check code => we are inside
902 // an active nmethod => use cpc to determine a return address
903 int exception_offset = int(pc - code_begin());
904 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
905 #ifdef ASSERT
906 if (cont_offset == 0) {
907 Thread* thread = Thread::current();
908 ResourceMark rm(thread);
909 CodeBlob* cb = CodeCache::find_blob(pc);
910 assert(cb != nullptr && cb == this, "");
911
912 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
913 stringStream ss;
914 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
915 print_on(&ss);
916 // Buffering to a stringStream, disable internal buffering so it's not done twice.
917 method()->print_codes_on(&ss, 0, false);
918 print_code_on(&ss);
919 print_pcs_on(&ss);
920 tty->print("%s", ss.as_string()); // print all at once
921 }
922 #endif
923 if (cont_offset == 0) {
924 // Let the normal error handling report the exception
925 return nullptr;
926 }
927 guarantee(cont_offset != exception_offset, "continuation offset and exception offset must be different");
928 return code_begin() + cont_offset;
929 }
930
931 class HasEvolDependency : public MetadataClosure {
932 bool _has_evol_dependency;
933 public:
934 HasEvolDependency() : _has_evol_dependency(false) {}
935 void do_metadata(Metadata* md) {
936 if (md->is_method()) {
937 Method* method = (Method*)md;
938 if (method->is_old()) {
939 _has_evol_dependency = true;
940 }
941 }
942 }
943 bool has_evol_dependency() const { return _has_evol_dependency; }
944 };
945
946 bool nmethod::has_evol_metadata() {
947 // Check the metadata in relocIter and CompiledIC and also deoptimize
948 // any nmethod that has reference to old methods.
949 HasEvolDependency check_evol;
950 metadata_do(&check_evol);
951 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
952 ResourceMark rm;
953 log_debug(redefine, class, nmethod)
954 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
955 _method->method_holder()->external_name(),
956 _method->name()->as_C_string(),
957 _method->signature()->as_C_string(),
958 compile_id());
959 }
960 return check_evol.has_evol_dependency();
961 }
962
963 int nmethod::total_size() const {
964 return
965 consts_size() +
966 insts_size() +
967 stub_size() +
968 scopes_data_size() +
969 scopes_pcs_size() +
970 handler_table_size() +
971 nul_chk_table_size();
972 }
973
974 const char* nmethod::compile_kind() const {
975 if (is_osr_method()) return "osr";
976 if (method() != nullptr && is_native_method()) {
977 if (method()->is_continuation_native_intrinsic()) {
978 return "cnt";
979 }
980 return "c2n";
981 }
982 return nullptr;
983 }
984
985 const char* nmethod::compiler_name() const {
986 return compilertype2name(_compiler_type);
987 }
988
989 #ifdef ASSERT
990 class CheckForOopsClosure : public OopClosure {
991 bool _found_oop = false;
992 public:
993 virtual void do_oop(oop* o) { _found_oop = true; }
994 virtual void do_oop(narrowOop* o) { _found_oop = true; }
995 bool found_oop() { return _found_oop; }
996 };
997 class CheckForMetadataClosure : public MetadataClosure {
998 bool _found_metadata = false;
999 Metadata* _ignore = nullptr;
1000 public:
1001 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1002 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1003 bool found_metadata() { return _found_metadata; }
1004 };
1005
1006 static void assert_no_oops_or_metadata(nmethod* nm) {
1007 if (nm == nullptr) return;
1008 assert(nm->oop_maps() == nullptr, "expectation");
1009
1010 CheckForOopsClosure cfo;
1011 nm->oops_do(&cfo);
1012 assert(!cfo.found_oop(), "no oops allowed");
1013
1014 // We allow an exception for the own Method, but require its class to be permanent.
1015 Method* own_method = nm->method();
1016 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1017 nm->metadata_do(&cfm);
1018 assert(!cfm.found_metadata(), "no metadata allowed");
1019
1020 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1021 "Method's class needs to be permanent");
1022 }
1023 #endif
1024
1025 static int required_mutable_data_size(CodeBuffer* code_buffer) {
1026 return align_up(code_buffer->total_relocation_size(), oopSize) +
1027 align_up(code_buffer->total_metadata_size(), oopSize);
1028 }
1029
1030 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1031 int compile_id,
1032 CodeBuffer *code_buffer,
1033 int vep_offset,
1034 int frame_complete,
1035 int frame_size,
1036 ByteSize basic_lock_owner_sp_offset,
1037 ByteSize basic_lock_sp_offset,
1038 OopMapSet* oop_maps,
1039 int exception_handler) {
1040 code_buffer->finalize_oop_references(method);
1041 // create nmethod
1042 nmethod* nm = nullptr;
1043 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1044 {
1045 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1046
1047 CodeOffsets offsets;
1048 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1049 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1050 if (exception_handler != -1) {
1051 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1052 }
1053
1054 int mutable_data_size = required_mutable_data_size(code_buffer);
1055
1056 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1057 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1058 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1059 nm = new (native_nmethod_size, allow_NonNMethod_space)
1060 nmethod(method(), compiler_none, native_nmethod_size,
1061 compile_id, &offsets,
1062 code_buffer, frame_size,
1063 basic_lock_owner_sp_offset,
1064 basic_lock_sp_offset,
1065 oop_maps, mutable_data_size);
1066 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1067 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1068 }
1069
1070 if (nm != nullptr) {
1071 // verify nmethod
1072 DEBUG_ONLY(nm->verify();) // might block
1073
1074 nm->log_new_nmethod();
1075 }
1076 return nm;
1077 }
1078
1079 nmethod* nmethod::new_nmethod(const methodHandle& method,
1080 int compile_id,
1081 int entry_bci,
1082 CodeOffsets* offsets,
1083 int orig_pc_offset,
1084 DebugInformationRecorder* debug_info,
1085 Dependencies* dependencies,
1086 CodeBuffer* code_buffer, int frame_size,
1087 OopMapSet* oop_maps,
1088 ExceptionHandlerTable* handler_table,
1089 ImplicitExceptionTable* nul_chk_table,
1090 AbstractCompiler* compiler,
1091 CompLevel comp_level,
1092 Flags flags)
1093 {
1094 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1095 code_buffer->finalize_oop_references(method);
1096 // create nmethod
1097 nmethod* nm = nullptr;
1098 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1099
1100 int immutable_data_size =
1101 adjust_pcs_size(debug_info->pcs_size())
1102 + align_up((int)dependencies->size_in_bytes(), oopSize)
1103 + align_up(handler_table->size_in_bytes() , oopSize)
1104 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1105 + align_up(debug_info->data_size() , oopSize);
1106
1107 // First, allocate space for immutable data in C heap.
1108 address immutable_data = nullptr;
1109 if (immutable_data_size > 0) {
1110 immutable_data_size += ImmutableDataRefCountSize;
1111 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1112 if (immutable_data == nullptr) {
1113 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1114 return nullptr;
1115 }
1116 }
1117
1118 int mutable_data_size = required_mutable_data_size(code_buffer);
1119
1120 {
1121 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1122
1123 nm = new (nmethod_size, comp_level)
1124 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1125 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1126 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1127 handler_table, nul_chk_table, compiler, comp_level, flags);
1128
1129 if (nm != nullptr) {
1130 // To make dependency checking during class loading fast, record
1131 // the nmethod dependencies in the classes it is dependent on.
1132 // This allows the dependency checking code to simply walk the
1133 // class hierarchy above the loaded class, checking only nmethods
1134 // which are dependent on those classes. The slow way is to
1135 // check every nmethod for dependencies which makes it linear in
1136 // the number of methods compiled. For applications with a lot
1137 // classes the slow way is too slow.
1138 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1139 if (deps.type() == Dependencies::call_site_target_value) {
1140 // CallSite dependencies are managed on per-CallSite instance basis.
1141 oop call_site = deps.argument_oop(0);
1142 MethodHandles::add_dependent_nmethod(call_site, nm);
1143 } else {
1144 InstanceKlass* ik = deps.context_type();
1145 if (ik == nullptr) {
1146 continue; // ignore things like evol_method
1147 }
1148 // record this nmethod as dependent on this klass
1149 ik->add_dependent_nmethod(nm);
1150 }
1151 }
1152 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm));
1153 }
1154 }
1155 // Do verification and logging outside CodeCache_lock.
1156 if (nm != nullptr) {
1157 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1158 DEBUG_ONLY(nm->verify();)
1159 nm->log_new_nmethod();
1160 }
1161 return nm;
1162 }
1163
1164 // Fill in default values for various fields
1165 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1166 // avoid uninitialized fields, even for short time periods
1167 _exception_cache = nullptr;
1168 _gc_data = nullptr;
1169 _oops_do_mark_link = nullptr;
1170 _compiled_ic_data = nullptr;
1171
1172 _is_unloading_state = 0;
1173 _state = not_installed;
1174
1175 _has_flushed_dependencies = false;
1176 _is_unlinked = false;
1177 _load_reported = false; // jvmti state
1178
1179 _deoptimization_status = not_marked;
1180
1181 // SECT_CONSTS is first in code buffer so the offset should be 0.
1182 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1183 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1184
1185 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1186
1187 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1188 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1189
1190 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1191 }
1192
1193 // Post initialization
1194 void nmethod::post_init() {
1195 clear_unloading_state();
1196
1197 finalize_relocations();
1198
1199 // Flush generated code
1200 ICache::invalidate_range(code_begin(), code_size());
1201
1202 Universe::heap()->register_nmethod(this);
1203
1204 #ifdef COMPILER2
1205 HotCodeCollector::register_nmethod(this);
1206 #endif // COMPILER2
1207
1208 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1209
1210 CodeCache::commit(this);
1211 }
1212
1213 // For native wrappers
1214 nmethod::nmethod(
1215 Method* method,
1216 CompilerType type,
1217 int nmethod_size,
1218 int compile_id,
1219 CodeOffsets* offsets,
1220 CodeBuffer* code_buffer,
1221 int frame_size,
1222 ByteSize basic_lock_owner_sp_offset,
1223 ByteSize basic_lock_sp_offset,
1224 OopMapSet* oop_maps,
1225 int mutable_data_size)
1226 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1227 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1228 _deoptimization_generation(0),
1229 _gc_epoch(CodeCache::gc_epoch()),
1230 _method(method),
1231 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1232 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1233 {
1234 {
1235 DEBUG_ONLY(NoSafepointVerifier nsv;)
1236 assert_locked_or_safepoint(CodeCache_lock);
1237
1238 init_defaults(code_buffer, offsets);
1239
1240 _osr_entry_point = nullptr;
1241 _pc_desc_container = nullptr;
1242 _entry_bci = InvocationEntryBci;
1243 _compile_id = compile_id;
1244 _comp_level = CompLevel_none;
1245 _compiler_type = type;
1246 _orig_pc_offset = 0;
1247 _num_stack_arg_slots = 0;
1248
1249 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1250 // Continuation enter intrinsic
1251 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1252 } else {
1253 _exception_offset = 0;
1254 }
1255 // Native wrappers do not have deopt handlers. Make the values
1256 // something that will never match a pc like the nmethod vtable entry
1257 _deopt_handler_entry_offset = 0;
1258 _unwind_handler_offset = 0;
1259
1260 int metadata_size = align_up(code_buffer->total_metadata_size(), wordSize);
1261 assert(_mutable_data_size == _relocation_size + metadata_size,
1262 "wrong mutable data size: %d != %d + %d",
1263 _mutable_data_size, _relocation_size, metadata_size);
1264
1265 // native wrapper does not have read-only data but we need unique not null address
1266 _immutable_data = blob_end();
1267 _immutable_data_size = 0;
1268 _nul_chk_table_offset = 0;
1269 _handler_table_offset = 0;
1270 _scopes_pcs_offset = 0;
1271 _scopes_data_offset = 0;
1272 _immutable_data_ref_count_offset = 0;
1273
1274 code_buffer->copy_code_and_locs_to(this);
1275 code_buffer->copy_values_to(this);
1276
1277 post_init();
1278 }
1279
1280 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1281 ttyLocker ttyl; // keep the following output all in one block
1282 // This output goes directly to the tty, not the compiler log.
1283 // To enable tools to match it up with the compilation activity,
1284 // be sure to tag this tty output with the compile ID.
1285 if (xtty != nullptr) {
1286 xtty->begin_head("print_native_nmethod");
1287 xtty->method(_method);
1288 xtty->stamp();
1289 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1290 }
1291 // Print the header part, then print the requested information.
1292 // This is both handled in decode2(), called via print_code() -> decode()
1293 if (PrintNativeNMethods) {
1294 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1295 print_code();
1296 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1297 #if defined(SUPPORT_DATA_STRUCTS)
1298 if (AbstractDisassembler::show_structs()) {
1299 if (oop_maps != nullptr) {
1300 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1301 oop_maps->print_on(tty);
1302 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1303 }
1304 }
1305 #endif
1306 } else {
1307 print(); // print the header part only.
1308 }
1309 #if defined(SUPPORT_DATA_STRUCTS)
1310 if (AbstractDisassembler::show_structs()) {
1311 if (PrintRelocations) {
1312 print_relocations();
1313 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1314 }
1315 }
1316 #endif
1317 if (xtty != nullptr) {
1318 xtty->tail("print_native_nmethod");
1319 }
1320 }
1321 }
1322
1323
1324 nmethod::nmethod(const nmethod &nm) : CodeBlob(nm._name, nm._kind, nm._size, nm._header_size),
1325 _flags(nm._flags)
1326 {
1327
1328 if (nm._oop_maps != nullptr) {
1329 _oop_maps = nm._oop_maps->clone();
1330 } else {
1331 _oop_maps = nullptr;
1332 }
1333
1334 _size = nm._size;
1335 _relocation_size = nm._relocation_size;
1336 _content_offset = nm._content_offset;
1337 _code_offset = nm._code_offset;
1338 _data_offset = nm._data_offset;
1339 _frame_size = nm._frame_size;
1340
1341 S390_ONLY( _ctable_offset = nm._ctable_offset; )
1342
1343 _header_size = nm._header_size;
1344 _frame_complete_offset = nm._frame_complete_offset;
1345
1346 _kind = nm._kind;
1347
1348 _caller_must_gc_arguments = nm._caller_must_gc_arguments;
1349
1350 #ifndef PRODUCT
1351 _asm_remarks.share(nm._asm_remarks);
1352 _dbg_strings.share(nm._dbg_strings);
1353 #endif
1354
1355 // Allocate memory and copy mutable data to C heap
1356 _mutable_data_size = nm._mutable_data_size;
1357 if (_mutable_data_size > 0) {
1358 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
1359 if (_mutable_data == nullptr) {
1360 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for mutable data");
1361 }
1362 memcpy(mutable_data_begin(), nm.mutable_data_begin(), nm.mutable_data_size());
1363 } else {
1364 _mutable_data = nullptr;
1365 }
1366
1367 _deoptimization_generation = 0;
1368 _gc_epoch = CodeCache::gc_epoch();
1369 _method = nm._method;
1370 _osr_link = nullptr;
1371
1372 _exception_cache = nullptr;
1373 _gc_data = nullptr;
1374 _oops_do_mark_nmethods = nullptr;
1375 _oops_do_mark_link = nullptr;
1376 _compiled_ic_data = nullptr;
1377
1378 if (nm._osr_entry_point != nullptr) {
1379 _osr_entry_point = (nm._osr_entry_point - (address) &nm) + (address) this;
1380 } else {
1381 _osr_entry_point = nullptr;
1382 }
1383
1384 _entry_offset = nm._entry_offset;
1385 _verified_entry_offset = nm._verified_entry_offset;
1386 _entry_bci = nm._entry_bci;
1387 _immutable_data_size = nm._immutable_data_size;
1388
1389 _skipped_instructions_size = nm._skipped_instructions_size;
1390 _stub_offset = nm._stub_offset;
1391 _exception_offset = nm._exception_offset;
1392 _deopt_handler_entry_offset = nm._deopt_handler_entry_offset;
1393 _unwind_handler_offset = nm._unwind_handler_offset;
1394 _num_stack_arg_slots = nm._num_stack_arg_slots;
1395 _nul_chk_table_offset = nm._nul_chk_table_offset;
1396 _handler_table_offset = nm._handler_table_offset;
1397 _scopes_pcs_offset = nm._scopes_pcs_offset;
1398 _scopes_data_offset = nm._scopes_data_offset;
1399 _immutable_data_ref_count_offset = nm._immutable_data_ref_count_offset;
1400
1401 // Increment number of references to immutable data to share it between nmethods
1402 if (_immutable_data_size > 0) {
1403 _immutable_data = nm._immutable_data;
1404 inc_immutable_data_ref_count();
1405 } else {
1406 _immutable_data = blob_end();
1407 }
1408
1409 _orig_pc_offset = nm._orig_pc_offset;
1410 _compile_id = nm._compile_id;
1411 _comp_level = nm._comp_level;
1412 _compiler_type = nm._compiler_type;
1413 _is_unloading_state = nm._is_unloading_state;
1414 _state = not_installed;
1415
1416 _has_flushed_dependencies = nm._has_flushed_dependencies;
1417 _is_unlinked = nm._is_unlinked;
1418 _load_reported = nm._load_reported;
1419
1420 _deoptimization_status = nm._deoptimization_status;
1421
1422 if (nm._pc_desc_container != nullptr) {
1423 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1424 } else {
1425 _pc_desc_container = nullptr;
1426 }
1427
1428 // Copy nmethod contents excluding header
1429 // - Constant part (doubles, longs and floats used in nmethod)
1430 // - Code part:
1431 // - Code body
1432 // - Exception handler
1433 // - Stub code
1434 // - OOP table
1435 memcpy(consts_begin(), nm.consts_begin(), nm.data_end() - nm.consts_begin());
1436
1437 // Fix relocation
1438 RelocIterator iter(this);
1439 CodeBuffer src(&nm);
1440 CodeBuffer dst(this);
1441 while (iter.next()) {
1442 #ifdef USE_TRAMPOLINE_STUB_FIX_OWNER
1443 // After an nmethod is moved, some direct call sites may end up out of range.
1444 // CallRelocation::fix_relocation_after_move() assumes the target is always
1445 // reachable and does not check branch range. Calling it without range checks
1446 // could cause us to write an offset too large for the instruction.
1447 //
1448 // If a call site has a trampoline, we skip the normal call relocation. The
1449 // associated trampoline_stub_Relocation will handle the call and the
1450 // trampoline, including range checks and updating the branch as needed.
1451 //
1452 // If no trampoline exists, we can assume the call target is always
1453 // reachable and therefore within direct branch range, so calling
1454 // CallRelocation::fix_relocation_after_move() is safe.
1455 if (iter.reloc()->is_call()) {
1456 address trampoline = trampoline_stub_Relocation::get_trampoline_for(iter.reloc()->addr(), this);
1457 if (trampoline != nullptr) {
1458 continue;
1459 }
1460 }
1461 #endif
1462
1463 iter.reloc()->fix_relocation_after_move(&src, &dst);
1464 }
1465
1466 {
1467 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1468 clear_inline_caches();
1469 }
1470
1471 post_init();
1472 }
1473
1474 nmethod* nmethod::relocate(CodeBlobType code_blob_type) {
1475 assert(NMethodRelocation, "must enable use of function");
1476
1477 // Locks required to be held by caller to ensure the nmethod
1478 // is not modified or purged from code cache during relocation
1479 assert_lock_strong(CodeCache_lock);
1480 assert_lock_strong(Compile_lock);
1481 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1482
1483 if (!is_relocatable()) {
1484 return nullptr;
1485 }
1486
1487 run_nmethod_entry_barrier();
1488 nmethod* nm_copy = new (size(), code_blob_type) nmethod(*this);
1489
1490 if (nm_copy == nullptr) {
1491 return nullptr;
1492 }
1493
1494 // To make dependency checking during class loading fast, record
1495 // the nmethod dependencies in the classes it is dependent on.
1496 // This allows the dependency checking code to simply walk the
1497 // class hierarchy above the loaded class, checking only nmethods
1498 // which are dependent on those classes. The slow way is to
1499 // check every nmethod for dependencies which makes it linear in
1500 // the number of methods compiled. For applications with a lot
1501 // classes the slow way is too slow.
1502 for (Dependencies::DepStream deps(nm_copy); deps.next(); ) {
1503 if (deps.type() == Dependencies::call_site_target_value) {
1504 // CallSite dependencies are managed on per-CallSite instance basis.
1505 oop call_site = deps.argument_oop(0);
1506 MethodHandles::add_dependent_nmethod(call_site, nm_copy);
1507 } else {
1508 InstanceKlass* ik = deps.context_type();
1509 if (ik == nullptr) {
1510 continue; // ignore things like evol_method
1511 }
1512 // record this nmethod as dependent on this klass
1513 ik->add_dependent_nmethod(nm_copy);
1514 }
1515 }
1516
1517 MutexLocker ml_NMethodState_lock(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1518
1519 // Verify the nm we copied from is still valid
1520 if (!is_marked_for_deoptimization() && is_in_use()) {
1521 assert(method() != nullptr && method()->code() == this, "should be if is in use");
1522
1523 // Attempt to start using the copy
1524 if (nm_copy->make_in_use()) {
1525 methodHandle mh(Thread::current(), nm_copy->method());
1526 nm_copy->method()->set_code(mh, nm_copy);
1527
1528 make_not_entrant(InvalidationReason::RELOCATED);
1529
1530 nm_copy->post_compiled_method_load_event();
1531
1532 nm_copy->log_relocated_nmethod(this);
1533
1534 return nm_copy;
1535 }
1536 }
1537
1538 nm_copy->make_not_used();
1539
1540 return nullptr;
1541 }
1542
1543 bool nmethod::is_relocatable() {
1544 if (!is_java_method()) {
1545 return false;
1546 }
1547
1548 if (!is_in_use()) {
1549 return false;
1550 }
1551
1552 if (is_osr_method()) {
1553 return false;
1554 }
1555
1556 if (is_marked_for_deoptimization()) {
1557 return false;
1558 }
1559
1560 if (is_unloading()) {
1561 return false;
1562 }
1563
1564 if (has_evol_metadata()) {
1565 return false;
1566 }
1567
1568 return true;
1569 }
1570
1571 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1572 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1573 }
1574
1575 void* nmethod::operator new(size_t size, int nmethod_size, CodeBlobType code_blob_type) throw () {
1576 return CodeCache::allocate(nmethod_size, code_blob_type);
1577 }
1578
1579 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1580 // Try MethodNonProfiled and MethodProfiled.
1581 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1582 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1583 // Try NonNMethod or give up.
1584 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1585 }
1586
1587 // For normal JIT compiled code
1588 nmethod::nmethod(
1589 Method* method,
1590 CompilerType type,
1591 int nmethod_size,
1592 int immutable_data_size,
1593 int mutable_data_size,
1594 int compile_id,
1595 int entry_bci,
1596 address immutable_data,
1597 CodeOffsets* offsets,
1598 int orig_pc_offset,
1599 DebugInformationRecorder* debug_info,
1600 Dependencies* dependencies,
1601 CodeBuffer *code_buffer,
1602 int frame_size,
1603 OopMapSet* oop_maps,
1604 ExceptionHandlerTable* handler_table,
1605 ImplicitExceptionTable* nul_chk_table,
1606 AbstractCompiler* compiler,
1607 CompLevel comp_level,
1608 Flags flags)
1609 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1610 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1611 _deoptimization_generation(0),
1612 _gc_epoch(CodeCache::gc_epoch()),
1613 _method(method),
1614 _osr_link(nullptr),
1615 _flags(flags)
1616 {
1617 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1618 {
1619 DEBUG_ONLY(NoSafepointVerifier nsv;)
1620 assert_locked_or_safepoint(CodeCache_lock);
1621
1622 init_defaults(code_buffer, offsets);
1623
1624 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1625 _entry_bci = entry_bci;
1626 _compile_id = compile_id;
1627 _comp_level = comp_level;
1628 _compiler_type = type;
1629 _orig_pc_offset = orig_pc_offset;
1630
1631 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1632
1633 set_ctable_begin(header_begin() + content_offset());
1634
1635 // Exception handler and deopt handler are in the stub section
1636 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1637
1638 bool has_exception_handler = (offsets->value(CodeOffsets::Exceptions) != -1);
1639 assert(has_exception_handler == (compiler->type() != compiler_c2),
1640 "C2 compiler doesn't provide exception handler stub code.");
1641 if (has_exception_handler) {
1642 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1643 } else {
1644 _exception_offset = -1;
1645 }
1646
1647 _deopt_handler_entry_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1648
1649 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1650 // C1 generates UnwindHandler at the end of instructions section.
1651 // Calculate positive offset as distance between the start of stubs section
1652 // (which is also the end of instructions section) and the start of the handler.
1653 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1654 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1655 } else {
1656 _unwind_handler_offset = -1;
1657 }
1658
1659 int metadata_size = align_up(code_buffer->total_metadata_size(), wordSize);
1660 assert(_mutable_data_size == _relocation_size + metadata_size,
1661 "wrong mutable data size: %d != %d + %d",
1662 _mutable_data_size, _relocation_size, metadata_size);
1663 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1664 nmethod_size, (int)(code_end() - header_begin()));
1665
1666 _immutable_data_size = immutable_data_size;
1667 if (immutable_data_size > 0) {
1668 assert(immutable_data != nullptr, "required");
1669 _immutable_data = immutable_data;
1670 } else {
1671 // We need unique not null address
1672 _immutable_data = blob_end();
1673 }
1674 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1675 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1676 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1677 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1678
1679 _immutable_data_ref_count_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1680 DEBUG_ONLY( int immutable_data_end_offset = _immutable_data_ref_count_offset + ImmutableDataRefCountSize; )
1681 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1682 immutable_data_end_offset, immutable_data_size);
1683
1684 // Copy code and relocation info
1685 code_buffer->copy_code_and_locs_to(this);
1686 // Copy oops and metadata
1687 code_buffer->copy_values_to(this);
1688 dependencies->copy_to(this);
1689 // Copy PcDesc and ScopeDesc data
1690 debug_info->copy_to(this);
1691
1692 // Create cache after PcDesc data is copied - it will be used to initialize cache
1693 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1694
1695 // Copy contents of ExceptionHandlerTable to nmethod
1696 handler_table->copy_to(this);
1697 nul_chk_table->copy_to(this);
1698
1699 init_immutable_data_ref_count();
1700
1701 post_init();
1702
1703 // we use the information of entry points to find out if a method is
1704 // static or non static
1705 assert(compiler->is_c2() ||
1706 _method->is_static() == (entry_point() == verified_entry_point()),
1707 " entry points must be same for static methods and vice versa");
1708 }
1709 }
1710
1711 // Print a short set of xml attributes to identify this nmethod. The
1712 // output should be embedded in some other element.
1713 void nmethod::log_identity(xmlStream* log) const {
1714 log->print(" compile_id='%d'", compile_id());
1715 const char* nm_kind = compile_kind();
1716 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1717 log->print(" compiler='%s'", compiler_name());
1718 if (TieredCompilation) {
1719 log->print(" level='%d'", comp_level());
1720 }
1721 }
1722
1723
1724 #define LOG_OFFSET(log, name) \
1725 if (p2i(name##_end()) - p2i(name##_begin())) \
1726 log->print(" " XSTR(name) "_offset='%zd'" , \
1727 p2i(name##_begin()) - p2i(this))
1728
1729
1730 void nmethod::log_new_nmethod() const {
1731 if (LogCompilation && xtty != nullptr) {
1732 ttyLocker ttyl;
1733 xtty->begin_elem("nmethod");
1734 log_identity(xtty);
1735 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1736 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1737
1738 LOG_OFFSET(xtty, relocation);
1739 LOG_OFFSET(xtty, consts);
1740 LOG_OFFSET(xtty, insts);
1741 LOG_OFFSET(xtty, stub);
1742 LOG_OFFSET(xtty, scopes_data);
1743 LOG_OFFSET(xtty, scopes_pcs);
1744 LOG_OFFSET(xtty, dependencies);
1745 LOG_OFFSET(xtty, handler_table);
1746 LOG_OFFSET(xtty, nul_chk_table);
1747 LOG_OFFSET(xtty, oops);
1748 LOG_OFFSET(xtty, metadata);
1749
1750 xtty->method(method());
1751 xtty->stamp();
1752 xtty->end_elem();
1753 }
1754 }
1755
1756
1757 void nmethod::log_relocated_nmethod(nmethod* original) const {
1758 if (LogCompilation && xtty != nullptr) {
1759 ttyLocker ttyl;
1760 xtty->begin_elem("relocated nmethod");
1761 log_identity(xtty);
1762 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1763
1764 const char* original_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(original));
1765 xtty->print(" original_address='" INTPTR_FORMAT "'", p2i(original));
1766 xtty->print(" original_code_heap='%s'", original_code_heap_name);
1767
1768 const char* new_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(this));
1769 xtty->print(" new_address='" INTPTR_FORMAT "'", p2i(this));
1770 xtty->print(" new_code_heap='%s'", new_code_heap_name);
1771
1772 LOG_OFFSET(xtty, relocation);
1773 LOG_OFFSET(xtty, consts);
1774 LOG_OFFSET(xtty, insts);
1775 LOG_OFFSET(xtty, stub);
1776 LOG_OFFSET(xtty, scopes_data);
1777 LOG_OFFSET(xtty, scopes_pcs);
1778 LOG_OFFSET(xtty, dependencies);
1779 LOG_OFFSET(xtty, handler_table);
1780 LOG_OFFSET(xtty, nul_chk_table);
1781 LOG_OFFSET(xtty, oops);
1782 LOG_OFFSET(xtty, metadata);
1783
1784 xtty->method(method());
1785 xtty->stamp();
1786 xtty->end_elem();
1787 }
1788 }
1789
1790 #undef LOG_OFFSET
1791
1792
1793 // Print out more verbose output usually for a newly created nmethod.
1794 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1795 if (st != nullptr) {
1796 ttyLocker ttyl;
1797 if (WizardMode) {
1798 CompileTask::print(st, this, msg, /*short_form:*/ true);
1799 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1800 } else {
1801 CompileTask::print(st, this, msg, /*short_form:*/ false);
1802 }
1803 }
1804 }
1805
1806 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1807 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1808 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1809 print_nmethod(printnmethods);
1810 }
1811 }
1812
1813 void nmethod::print_nmethod(bool printmethod) {
1814 ttyLocker ttyl; // keep the following output all in one block
1815 if (xtty != nullptr) {
1816 xtty->begin_head("print_nmethod");
1817 log_identity(xtty);
1818 xtty->stamp();
1819 xtty->end_head();
1820 }
1821 // Print the header part, then print the requested information.
1822 // This is both handled in decode2().
1823 if (printmethod) {
1824 ResourceMark m;
1825 if (is_compiled_by_c1()) {
1826 tty->cr();
1827 tty->print_cr("============================= C1-compiled nmethod ==============================");
1828 }
1829 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1830 decode2(tty);
1831 #if defined(SUPPORT_DATA_STRUCTS)
1832 if (AbstractDisassembler::show_structs()) {
1833 // Print the oops from the underlying CodeBlob as well.
1834 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1835 print_oops(tty);
1836 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1837 print_metadata(tty);
1838 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1839 print_pcs_on(tty);
1840 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1841 if (oop_maps() != nullptr) {
1842 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1843 oop_maps()->print_on(tty);
1844 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1845 }
1846 }
1847 #endif
1848 } else {
1849 print(); // print the header part only.
1850 }
1851
1852 #if defined(SUPPORT_DATA_STRUCTS)
1853 if (AbstractDisassembler::show_structs()) {
1854 methodHandle mh(Thread::current(), _method);
1855 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1856 print_scopes();
1857 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1858 }
1859 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1860 print_relocations();
1861 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1862 }
1863 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1864 print_dependencies_on(tty);
1865 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1866 }
1867 if (printmethod || PrintExceptionHandlers) {
1868 print_handler_table();
1869 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1870 print_nul_chk_table();
1871 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1872 }
1873
1874 if (printmethod) {
1875 print_recorded_oops();
1876 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1877 print_recorded_metadata();
1878 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1879 }
1880 }
1881 #endif
1882
1883 if (xtty != nullptr) {
1884 xtty->tail("print_nmethod");
1885 }
1886 }
1887
1888
1889 // Promote one word from an assembly-time handle to a live embedded oop.
1890 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1891 if (handle == nullptr ||
1892 // As a special case, IC oops are initialized to 1 or -1.
1893 handle == (jobject) Universe::non_oop_word()) {
1894 *(void**)dest = handle;
1895 } else {
1896 *dest = JNIHandles::resolve_non_null(handle);
1897 }
1898 }
1899
1900
1901 // Have to have the same name because it's called by a template
1902 void nmethod::copy_values(GrowableArray<jobject>* array) {
1903 int length = array->length();
1904 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1905 oop* dest = oops_begin();
1906 for (int index = 0 ; index < length; index++) {
1907 initialize_immediate_oop(&dest[index], array->at(index));
1908 }
1909
1910 // Now we can fix up all the oops in the code. We need to do this
1911 // in the code because the assembler uses jobjects as placeholders.
1912 // The code and relocations have already been initialized by the
1913 // CodeBlob constructor, so it is valid even at this early point to
1914 // iterate over relocations and patch the code.
1915 fix_oop_relocations(/*initialize_immediates=*/ true);
1916 }
1917
1918 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1919 int length = array->length();
1920 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1921 Metadata** dest = metadata_begin();
1922 for (int index = 0 ; index < length; index++) {
1923 dest[index] = array->at(index);
1924 }
1925 }
1926
1927 bool nmethod::fix_oop_relocations(bool initialize_immediates) {
1928 // re-patch all oop-bearing instructions, just in case some oops moved
1929 RelocIterator iter(this);
1930 bool modified_code = false;
1931 while (iter.next()) {
1932 if (iter.type() == relocInfo::oop_type) {
1933 oop_Relocation* reloc = iter.oop_reloc();
1934 if (!reloc->oop_is_immediate()) {
1935 // Refresh the oop-related bits of this instruction.
1936 reloc->set_value(reloc->value());
1937 modified_code = true;
1938 } else if (initialize_immediates) {
1939 oop* dest = reloc->oop_addr();
1940 jobject obj = *reinterpret_cast<jobject*>(dest);
1941 initialize_immediate_oop(dest, obj);
1942 }
1943 } else if (iter.type() == relocInfo::metadata_type) {
1944 metadata_Relocation* reloc = iter.metadata_reloc();
1945 reloc->fix_metadata_relocation();
1946 modified_code |= !reloc->metadata_is_immediate();
1947 }
1948 }
1949 return modified_code;
1950 }
1951
1952 void nmethod::fix_oop_relocations() {
1953 ICacheInvalidationContext icic;
1954 fix_oop_relocations(&icic);
1955 }
1956
1957 void nmethod::fix_oop_relocations(ICacheInvalidationContext* icic) {
1958 assert(icic != nullptr, "must provide context to track if code was modified");
1959 bool modified_code = fix_oop_relocations(/*initialize_immediates=*/ false);
1960 if (modified_code) {
1961 icic->set_has_modified_code();
1962 }
1963 }
1964
1965 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1966 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1967 intptr_t cbaddr = (intptr_t) nm;
1968 intptr_t offset = ((intptr_t) pc) - cbaddr;
1969
1970 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1971 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1972 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1973 } else if (!nop->patch(oopmap_slot, offset)) {
1974 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1975 }
1976 }
1977
1978 void nmethod::finalize_relocations() {
1979 NoSafepointVerifier nsv;
1980
1981 GrowableArray<NativeMovConstReg*> virtual_call_data;
1982
1983 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
1984
1985 // Make sure that post call nops fill in nmethod offsets eagerly so
1986 // we don't have to race with deoptimization
1987 RelocIterator iter(this);
1988 while (iter.next()) {
1989 if (iter.type() == relocInfo::virtual_call_type) {
1990 virtual_call_Relocation* r = iter.virtual_call_reloc();
1991 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1992 virtual_call_data.append(value);
1993 } else if (iter.type() == relocInfo::post_call_nop_type) {
1994 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1995 address pc = reloc->addr();
1996 install_post_call_nop_displacement(this, pc);
1997 } else if (iter.type() == relocInfo::patchable_barrier_type) {
1998 patchable_barrier_Relocation* const reloc = iter.patchable_barrier_reloc();
1999 bs_nm->patch_barrier_relocation(reloc);
2000 }
2001 }
2002
2003 if (virtual_call_data.length() > 0) {
2004 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
2005 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
2006 CompiledICData* next_data = _compiled_ic_data;
2007
2008 for (NativeMovConstReg* value : virtual_call_data) {
2009 value->set_data((intptr_t)next_data);
2010 next_data++;
2011 }
2012 }
2013 }
2014
2015 void nmethod::make_deoptimized() {
2016 if (!Continuations::enabled()) {
2017 // Don't deopt this again.
2018 set_deoptimized_done();
2019 return;
2020 }
2021
2022 assert(method() == nullptr || can_be_deoptimized(), "");
2023
2024 CompiledICLocker ml(this);
2025 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2026
2027 // If post call nops have been already patched, we can just bail-out.
2028 if (has_been_deoptimized()) {
2029 return;
2030 }
2031
2032 ResourceMark rm;
2033 RelocIterator iter(this, oops_reloc_begin());
2034
2035 // Assume there will be some calls to make deoptimized.
2036 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2037
2038 while (iter.next()) {
2039
2040 switch (iter.type()) {
2041 case relocInfo::virtual_call_type: {
2042 CompiledIC *ic = CompiledIC_at(&iter);
2043 address pc = ic->end_of_call();
2044 NativePostCallNop* nop = nativePostCallNop_at(pc);
2045 if (nop != nullptr) {
2046 nop->make_deopt();
2047 }
2048 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2049 break;
2050 }
2051 case relocInfo::static_call_type:
2052 case relocInfo::opt_virtual_call_type: {
2053 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2054 address pc = csc->end_of_call();
2055 NativePostCallNop* nop = nativePostCallNop_at(pc);
2056 //tty->print_cr(" - static pc %p", pc);
2057 if (nop != nullptr) {
2058 nop->make_deopt();
2059 }
2060 // We can't assert here, there are some calls to stubs / runtime
2061 // that have reloc data and doesn't have a post call NOP.
2062 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2063 break;
2064 }
2065 default:
2066 break;
2067 }
2068 }
2069 // Don't deopt this again.
2070 set_deoptimized_done();
2071 }
2072
2073 void nmethod::verify_clean_inline_caches() {
2074 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2075
2076 ResourceMark rm;
2077 RelocIterator iter(this, oops_reloc_begin());
2078 while(iter.next()) {
2079 switch(iter.type()) {
2080 case relocInfo::virtual_call_type: {
2081 CompiledIC *ic = CompiledIC_at(&iter);
2082 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2083 assert(cb != nullptr, "destination not in CodeBlob?");
2084 nmethod* nm = cb->as_nmethod_or_null();
2085 if (nm != nullptr) {
2086 // Verify that inline caches pointing to bad nmethods are clean
2087 if (!nm->is_in_use() || nm->is_unloading()) {
2088 assert(ic->is_clean(), "IC should be clean");
2089 }
2090 }
2091 break;
2092 }
2093 case relocInfo::static_call_type:
2094 case relocInfo::opt_virtual_call_type: {
2095 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2096 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2097 assert(cb != nullptr, "destination not in CodeBlob?");
2098 nmethod* nm = cb->as_nmethod_or_null();
2099 if (nm != nullptr) {
2100 // Verify that inline caches pointing to bad nmethods are clean
2101 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2102 assert(cdc->is_clean(), "IC should be clean");
2103 }
2104 }
2105 break;
2106 }
2107 default:
2108 break;
2109 }
2110 }
2111 }
2112
2113 void nmethod::mark_as_maybe_on_stack() {
2114 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2115 AtomicAccess::store(&_gc_epoch, CodeCache::gc_epoch());
2116 }
2117
2118 bool nmethod::is_maybe_on_stack() {
2119 // If the condition below is true, it means that the nmethod was found to
2120 // be alive the previous completed marking cycle.
2121 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2122 }
2123
2124 void nmethod::inc_decompile_count() {
2125 if (!is_compiled_by_c2()) {
2126 return;
2127 }
2128 // Could be gated by ProfileTraps, but do not bother...
2129 Method* m = method();
2130 if (m == nullptr) return;
2131 MethodData* mdo = m->method_data();
2132 if (mdo == nullptr) return;
2133 // There is a benign race here. See comments in methodData.hpp.
2134 mdo->inc_decompile_count();
2135 }
2136
2137 bool nmethod::try_transition(signed char new_state_int) {
2138 signed char new_state = new_state_int;
2139 assert_lock_strong(NMethodState_lock);
2140 signed char old_state = _state;
2141 if (old_state >= new_state) {
2142 // Ensure monotonicity of transitions.
2143 return false;
2144 }
2145 AtomicAccess::store(&_state, new_state);
2146 return true;
2147 }
2148
2149 void nmethod::invalidate_osr_method() {
2150 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2151 // Remove from list of active nmethods
2152 if (method() != nullptr) {
2153 method()->method_holder()->remove_osr_nmethod(this);
2154 }
2155 }
2156
2157 void nmethod::log_state_change(InvalidationReason invalidation_reason) const {
2158 if (LogCompilation) {
2159 if (xtty != nullptr) {
2160 ttyLocker ttyl; // keep the following output all in one block
2161 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2162 os::current_thread_id(), invalidation_reason_to_string(invalidation_reason));
2163 log_identity(xtty);
2164 xtty->stamp();
2165 xtty->end_elem();
2166 }
2167 }
2168
2169 ResourceMark rm;
2170 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2171 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2172
2173 CompileTask::print_ul(this, ss.freeze());
2174 if (PrintCompilation) {
2175 print_on_with_msg(tty, ss.freeze());
2176 }
2177 }
2178
2179 void nmethod::unlink_from_method() {
2180 if (method() != nullptr) {
2181 method()->unlink_code(this);
2182 }
2183 }
2184
2185 // Invalidate code
2186 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason) {
2187 // This can be called while the system is already at a safepoint which is ok
2188 NoSafepointVerifier nsv;
2189
2190 if (is_unloading()) {
2191 // If the nmethod is unloading, then it is already not entrant through
2192 // the nmethod entry barriers. No need to do anything; GC will unload it.
2193 return false;
2194 }
2195
2196 if (AtomicAccess::load(&_state) == not_entrant) {
2197 // Avoid taking the lock if already in required state.
2198 // This is safe from races because the state is an end-state,
2199 // which the nmethod cannot back out of once entered.
2200 // No need for fencing either.
2201 return false;
2202 }
2203
2204 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2205
2206 {
2207 // Enter critical section. Does not block for safepoint.
2208 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2209
2210 if (AtomicAccess::load(&_state) == not_entrant) {
2211 // another thread already performed this transition so nothing
2212 // to do, but return false to indicate this.
2213 return false;
2214 }
2215
2216 if (is_osr_method()) {
2217 // This logic is equivalent to the logic below for patching the
2218 // verified entry point of regular methods.
2219 // this effectively makes the osr nmethod not entrant
2220 invalidate_osr_method();
2221 } else {
2222 // The caller can be calling the method statically or through an inline
2223 // cache call.
2224 BarrierSet::barrier_set()->barrier_set_nmethod()->make_not_entrant(this);
2225 }
2226
2227 if (update_recompile_counts()) {
2228 // Mark the method as decompiled.
2229 inc_decompile_count();
2230 }
2231
2232 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2233 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2234 // If nmethod entry barriers are not supported, we won't mark
2235 // nmethods as on-stack when they become on-stack. So we
2236 // degrade to a less accurate flushing strategy, for now.
2237 mark_as_maybe_on_stack();
2238 }
2239
2240 // Change state
2241 bool success = try_transition(not_entrant);
2242 assert(success, "Transition can't fail");
2243
2244 // Log the transition once
2245 log_state_change(invalidation_reason);
2246
2247 // Remove nmethod from method.
2248 unlink_from_method();
2249
2250 } // leave critical region under NMethodState_lock
2251
2252 #ifdef ASSERT
2253 if (is_osr_method() && method() != nullptr) {
2254 // Make sure osr nmethod is invalidated, i.e. not on the list
2255 bool found = method()->method_holder()->remove_osr_nmethod(this);
2256 assert(!found, "osr nmethod should have been invalidated");
2257 }
2258 #endif
2259
2260 return true;
2261 }
2262
2263 // For concurrent GCs, there must be a handshake between unlink and flush
2264 void nmethod::unlink() {
2265 if (is_unlinked()) {
2266 // Already unlinked.
2267 return;
2268 }
2269
2270 flush_dependencies();
2271
2272 // unlink_from_method will take the NMethodState_lock.
2273 // In this case we don't strictly need it when unlinking nmethods from
2274 // the Method, because it is only concurrently unlinked by
2275 // the entry barrier, which acquires the per nmethod lock.
2276 unlink_from_method();
2277
2278 if (is_osr_method()) {
2279 invalidate_osr_method();
2280 }
2281
2282 // Post before flushing as jmethodID is being used
2283 post_compiled_method_unload();
2284
2285 // Register for flushing when it is safe. For concurrent class unloading,
2286 // that would be after the unloading handshake, and for STW class unloading
2287 // that would be when getting back to the VM thread.
2288 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2289 }
2290
2291 void nmethod::purge(bool unregister_nmethod) {
2292
2293 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2294
2295 // completely deallocate this method
2296 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2297
2298 LogTarget(Debug, codecache) lt;
2299 if (lt.is_enabled()) {
2300 ResourceMark rm;
2301 LogStream ls(lt);
2302 const char* method_name = method()->name()->as_C_string();
2303 const size_t codecache_capacity = CodeCache::capacity()/1024;
2304 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2305 ls.print("Flushing nmethod %6d/" INTPTR_FORMAT ", level=%d, osr=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2306 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2307 _compile_id, p2i(this), _comp_level, is_osr_method(), is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2308 codecache_capacity, codecache_free_space, method_name, compiler_name());
2309 }
2310
2311 // We need to deallocate any ExceptionCache data.
2312 // Note that we do not need to grab the nmethod lock for this, it
2313 // better be thread safe if we're disposing of it!
2314 ExceptionCache* ec = exception_cache();
2315 while(ec != nullptr) {
2316 ExceptionCache* next = ec->next();
2317 delete ec;
2318 ec = next;
2319 }
2320 if (_pc_desc_container != nullptr) {
2321 delete _pc_desc_container;
2322 }
2323 delete[] _compiled_ic_data;
2324
2325 if (_immutable_data != blob_end()) {
2326 // Free memory if this was the last nmethod referencing immutable data
2327 if (dec_immutable_data_ref_count() == 0) {
2328 os::free(_immutable_data);
2329 }
2330
2331 _immutable_data = blob_end(); // Valid not null address
2332 }
2333
2334 if (unregister_nmethod) {
2335 Universe::heap()->unregister_nmethod(this);
2336 }
2337
2338 #ifdef COMPILER2
2339 HotCodeCollector::unregister_nmethod(this);
2340 #endif // COMPILER2
2341
2342 CodeCache::unregister_old_nmethod(this);
2343
2344 CodeBlob::purge();
2345 }
2346
2347 oop nmethod::oop_at(int index) const {
2348 if (index == 0) {
2349 return nullptr;
2350 }
2351
2352 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2353 return bs_nm->oop_load_no_keepalive(this, index);
2354 }
2355
2356 oop nmethod::oop_at_phantom(int index) const {
2357 if (index == 0) {
2358 return nullptr;
2359 }
2360
2361 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2362 return bs_nm->oop_load_phantom(this, index);
2363 }
2364
2365 //
2366 // Notify all classes this nmethod is dependent on that it is no
2367 // longer dependent.
2368
2369 void nmethod::flush_dependencies() {
2370 if (!has_flushed_dependencies()) {
2371 set_has_flushed_dependencies(true);
2372 for (Dependencies::DepStream deps(this); deps.next(); ) {
2373 if (deps.type() == Dependencies::call_site_target_value) {
2374 // CallSite dependencies are managed on per-CallSite instance basis.
2375 oop call_site = deps.argument_oop(0);
2376 MethodHandles::clean_dependency_context(call_site);
2377 } else {
2378 InstanceKlass* ik = deps.context_type();
2379 if (ik == nullptr) {
2380 continue; // ignore things like evol_method
2381 }
2382 // During GC liveness of dependee determines class that needs to be updated.
2383 // The GC may clean dependency contexts concurrently and in parallel.
2384 ik->clean_dependency_context();
2385 }
2386 }
2387 }
2388 }
2389
2390 void nmethod::post_compiled_method(CompileTask* task) {
2391 task->mark_success();
2392 task->set_nm_content_size(content_size());
2393 task->set_nm_insts_size(insts_size());
2394 task->set_nm_total_size(total_size());
2395
2396 // JVMTI -- compiled method notification (must be done outside lock)
2397 post_compiled_method_load_event();
2398
2399 if (CompilationLog::log() != nullptr) {
2400 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2401 }
2402
2403 const DirectiveSet* directive = task->directive();
2404 maybe_print_nmethod(directive);
2405 }
2406
2407 #if INCLUDE_CDS
2408 static GrowableArrayCHeap<nmethod*, mtClassShared>* _delayed_compiled_method_load_events = nullptr;
2409
2410 void nmethod::add_delayed_compiled_method_load_event(nmethod* nm) {
2411 precond(CDSConfig::is_using_aot_linked_classes());
2412 precond(!ServiceThread::has_started());
2413
2414 // We are still in single threaded stage of VM bootstrap. No need to lock.
2415 if (_delayed_compiled_method_load_events == nullptr) {
2416 _delayed_compiled_method_load_events = new GrowableArrayCHeap<nmethod*, mtClassShared>();
2417 }
2418 _delayed_compiled_method_load_events->append(nm);
2419 }
2420
2421 void nmethod::post_delayed_compiled_method_load_events() {
2422 precond(ServiceThread::has_started());
2423 if (_delayed_compiled_method_load_events != nullptr) {
2424 for (int i = 0; i < _delayed_compiled_method_load_events->length(); i++) {
2425 nmethod* nm = _delayed_compiled_method_load_events->at(i);
2426 nm->post_compiled_method_load_event();
2427 }
2428 delete _delayed_compiled_method_load_events;
2429 _delayed_compiled_method_load_events = nullptr;
2430 }
2431 }
2432 #endif
2433
2434 // ------------------------------------------------------------------
2435 // post_compiled_method_load_event
2436 // new method for install_code() path
2437 // Transfer information from compilation to jvmti
2438 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2439 #if INCLUDE_CDS
2440 if (!ServiceThread::has_started()) {
2441 // With AOT-linked classes, we could compile wrappers for native methods before the
2442 // ServiceThread has been started, so we must delay the events to be posted later.
2443 assert(state == nullptr, "must be");
2444 add_delayed_compiled_method_load_event(this);
2445 return;
2446 }
2447 #endif
2448
2449 // This is a bad time for a safepoint. We don't want
2450 // this nmethod to get unloaded while we're queueing the event.
2451 NoSafepointVerifier nsv;
2452
2453 Method* m = method();
2454 HOTSPOT_COMPILED_METHOD_LOAD(
2455 (char *) m->klass_name()->bytes(),
2456 m->klass_name()->utf8_length(),
2457 (char *) m->name()->bytes(),
2458 m->name()->utf8_length(),
2459 (char *) m->signature()->bytes(),
2460 m->signature()->utf8_length(),
2461 insts_begin(), insts_size());
2462
2463
2464 if (JvmtiExport::should_post_compiled_method_load()) {
2465 // Only post unload events if load events are found.
2466 set_load_reported();
2467 // If a JavaThread hasn't been passed in, let the Service thread
2468 // (which is a real Java thread) post the event
2469 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2470 if (state == nullptr) {
2471 // Execute any barrier code for this nmethod as if it's called, since
2472 // keeping it alive looks like stack walking.
2473 run_nmethod_entry_barrier();
2474 ServiceThread::enqueue_deferred_event(&event);
2475 } else {
2476 // This enters the nmethod barrier outside in the caller.
2477 state->enqueue_event(&event);
2478 }
2479 }
2480 }
2481
2482 void nmethod::post_compiled_method_unload() {
2483 assert(_method != nullptr, "just checking");
2484 DTRACE_METHOD_UNLOAD_PROBE(method());
2485
2486 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2487 // post the event. The Method* will not be valid when this is freed.
2488
2489 // Don't bother posting the unload if the load event wasn't posted.
2490 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2491 JvmtiDeferredEvent event =
2492 JvmtiDeferredEvent::compiled_method_unload_event(
2493 method()->jmethod_id(), insts_begin());
2494 ServiceThread::enqueue_deferred_event(&event);
2495 }
2496 }
2497
2498 // Iterate over metadata calling this function. Used by RedefineClasses
2499 void nmethod::metadata_do(MetadataClosure* f) {
2500 {
2501 // Visit all immediate references that are embedded in the instruction stream.
2502 RelocIterator iter(this, oops_reloc_begin());
2503 while (iter.next()) {
2504 if (iter.type() == relocInfo::metadata_type) {
2505 metadata_Relocation* r = iter.metadata_reloc();
2506 // In this metadata, we must only follow those metadatas directly embedded in
2507 // the code. Other metadatas (oop_index>0) are seen as part of
2508 // the metadata section below.
2509 assert(1 == (r->metadata_is_immediate()) +
2510 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2511 "metadata must be found in exactly one place");
2512 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2513 Metadata* md = r->metadata_value();
2514 if (md != _method) f->do_metadata(md);
2515 }
2516 } else if (iter.type() == relocInfo::virtual_call_type) {
2517 // Check compiledIC holders associated with this nmethod
2518 ResourceMark rm;
2519 CompiledIC *ic = CompiledIC_at(&iter);
2520 ic->metadata_do(f);
2521 }
2522 }
2523 }
2524
2525 // Visit the metadata section
2526 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2527 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2528 Metadata* md = *p;
2529 f->do_metadata(md);
2530 }
2531
2532 // Visit metadata not embedded in the other places.
2533 if (_method != nullptr) f->do_metadata(_method);
2534 }
2535
2536 // Heuristic for nuking nmethods even though their oops are live.
2537 // Main purpose is to reduce code cache pressure and get rid of
2538 // nmethods that don't seem to be all that relevant any longer.
2539 bool nmethod::is_cold() {
2540 if (!MethodFlushing || is_not_installed()) {
2541 // No heuristic unloading at all
2542 return false;
2543 }
2544
2545 if (!is_maybe_on_stack() && is_not_entrant()) {
2546 // Not entrant nmethods that are not on any stack can just
2547 // be removed
2548 return true;
2549 }
2550
2551 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2552 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2553 // On platforms that don't support nmethod entry barriers, we can't
2554 // trust the temporal aspect of the gc epochs. So we can't detect
2555 // cold nmethods on such platforms.
2556 return false;
2557 }
2558
2559 if (!UseCodeCacheFlushing) {
2560 // Bail out if we don't heuristically remove nmethods
2561 return false;
2562 }
2563
2564 // Other code can be phased out more gradually after N GCs
2565 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2566 }
2567
2568 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2569 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2570 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2571 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2572 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2573
2574 class IsUnloadingState: public AllStatic {
2575 static const uint8_t _is_unloading_mask = 1;
2576 static const uint8_t _is_unloading_shift = 0;
2577 static const uint8_t _unloading_cycle_mask = 6;
2578 static const uint8_t _unloading_cycle_shift = 1;
2579
2580 static uint8_t set_is_unloading(uint8_t state, bool value) {
2581 state &= (uint8_t)~_is_unloading_mask;
2582 if (value) {
2583 state |= 1 << _is_unloading_shift;
2584 }
2585 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2586 return state;
2587 }
2588
2589 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2590 state &= (uint8_t)~_unloading_cycle_mask;
2591 state |= (uint8_t)(value << _unloading_cycle_shift);
2592 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2593 return state;
2594 }
2595
2596 public:
2597 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2598 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2599
2600 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2601 uint8_t state = 0;
2602 state = set_is_unloading(state, is_unloading);
2603 state = set_unloading_cycle(state, unloading_cycle);
2604 return state;
2605 }
2606 };
2607
2608 bool nmethod::is_unloading() {
2609 uint8_t state = AtomicAccess::load(&_is_unloading_state);
2610 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2611 if (state_is_unloading) {
2612 return true;
2613 }
2614 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2615 uint8_t current_cycle = CodeCache::unloading_cycle();
2616 if (state_unloading_cycle == current_cycle) {
2617 return false;
2618 }
2619
2620 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2621 // should be unloaded. This can be either because there is a dead oop,
2622 // or because is_cold() heuristically determines it is time to unload.
2623 state_unloading_cycle = current_cycle;
2624 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2625 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2626
2627 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2628
2629 // Note that if an nmethod has dead oops, everyone will agree that the
2630 // nmethod is_unloading. However, the is_cold heuristics can yield
2631 // different outcomes, so we guard the computed result with a CAS
2632 // to ensure all threads have a shared view of whether an nmethod
2633 // is_unloading or not.
2634 uint8_t found_state = AtomicAccess::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2635
2636 if (found_state == state) {
2637 // First to change state, we win
2638 return state_is_unloading;
2639 } else {
2640 // State already set, so use it
2641 return IsUnloadingState::is_unloading(found_state);
2642 }
2643 }
2644
2645 void nmethod::clear_unloading_state() {
2646 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2647 AtomicAccess::store(&_is_unloading_state, state);
2648 }
2649
2650
2651 // This is called at the end of the strong tracing/marking phase of a
2652 // GC to unload an nmethod if it contains otherwise unreachable
2653 // oops or is heuristically found to be not important.
2654 void nmethod::do_unloading(bool unloading_occurred) {
2655 // Make sure the oop's ready to receive visitors
2656 if (is_unloading()) {
2657 unlink();
2658 } else {
2659 unload_nmethod_caches(unloading_occurred);
2660 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2661 if (bs_nm != nullptr) {
2662 bs_nm->disarm(this);
2663 }
2664 }
2665 }
2666
2667 void nmethod::oops_do(OopClosure* f) {
2668 // Prevent extra code cache walk for platforms that don't have immediate oops.
2669 if (relocInfo::mustIterateImmediateOopsInCode()) {
2670 RelocIterator iter(this, oops_reloc_begin());
2671
2672 while (iter.next()) {
2673 if (iter.type() == relocInfo::oop_type ) {
2674 oop_Relocation* r = iter.oop_reloc();
2675 // In this loop, we must only follow those oops directly embedded in
2676 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2677 assert(1 == (r->oop_is_immediate()) +
2678 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2679 "oop must be found in exactly one place");
2680 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2681 f->do_oop(r->oop_addr());
2682 }
2683 }
2684 }
2685 }
2686
2687 // Scopes
2688 // This includes oop constants not inlined in the code stream.
2689 for (oop* p = oops_begin(); p < oops_end(); p++) {
2690 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2691 f->do_oop(p);
2692 }
2693 }
2694
2695 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2696 // Process oops in the nmethod
2697 oops_do(cl);
2698
2699 // CodeCache unloading support
2700 mark_as_maybe_on_stack();
2701
2702 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2703 bs_nm->disarm(this);
2704
2705 // There's an assumption made that this function is not used by GCs that
2706 // relocate objects, and therefore we don't call fix_oop_relocations.
2707 }
2708
2709 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2710
2711 void nmethod::oops_do_log_change(const char* state) {
2712 LogTarget(Trace, gc, nmethod) lt;
2713 if (lt.is_enabled()) {
2714 LogStream ls(lt);
2715 CompileTask::print(&ls, this, state, true /* short_form */);
2716 }
2717 }
2718
2719 bool nmethod::oops_do_try_claim() {
2720 if (oops_do_try_claim_weak_request()) {
2721 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2722 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2723 return true;
2724 }
2725 return false;
2726 }
2727
2728 bool nmethod::oops_do_try_claim_weak_request() {
2729 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2730
2731 if ((_oops_do_mark_link == nullptr) &&
2732 (AtomicAccess::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2733 oops_do_log_change("oops_do, mark weak request");
2734 return true;
2735 }
2736 return false;
2737 }
2738
2739 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2740 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2741 }
2742
2743 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2744 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2745
2746 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2747 if (old_next == nullptr) {
2748 oops_do_log_change("oops_do, mark strong done");
2749 }
2750 return old_next;
2751 }
2752
2753 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2754 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2755 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2756
2757 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2758 if (old_next == next) {
2759 oops_do_log_change("oops_do, mark strong request");
2760 }
2761 return old_next;
2762 }
2763
2764 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2765 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2766 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2767
2768 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2769 if (old_next == next) {
2770 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2771 return true;
2772 }
2773 return false;
2774 }
2775
2776 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2777 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2778
2779 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2780 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2781 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2782
2783 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2784 // Self-loop if needed.
2785 if (old_head == nullptr) {
2786 old_head = this;
2787 }
2788 // Try to install end of list and weak done tag.
2789 if (AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
2790 oops_do_log_change("oops_do, mark weak done");
2791 return nullptr;
2792 } else {
2793 return old_head;
2794 }
2795 }
2796
2797 void nmethod::oops_do_add_to_list_as_strong_done() {
2798 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2799
2800 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2801 // Self-loop if needed.
2802 if (old_head == nullptr) {
2803 old_head = this;
2804 }
2805 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2806 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2807
2808 oops_do_set_strong_done(old_head);
2809 }
2810
2811 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2812 if (!oops_do_try_claim_weak_request()) {
2813 // Failed to claim for weak processing.
2814 oops_do_log_change("oops_do, mark weak request fail");
2815 return;
2816 }
2817
2818 p->do_regular_processing(this);
2819
2820 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2821 if (old_head == nullptr) {
2822 return;
2823 }
2824 oops_do_log_change("oops_do, mark weak done fail");
2825 // Adding to global list failed, another thread added a strong request.
2826 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2827 "must be but is %u", extract_state(_oops_do_mark_link));
2828
2829 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2830
2831 oops_do_set_strong_done(old_head);
2832 // Do missing strong processing.
2833 p->do_remaining_strong_processing(this);
2834 }
2835
2836 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2837 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2838 if (next_raw == nullptr) {
2839 p->do_regular_processing(this);
2840 oops_do_add_to_list_as_strong_done();
2841 return;
2842 }
2843 // Claim failed. Figure out why and handle it.
2844 if (oops_do_has_weak_request(next_raw)) {
2845 oops_do_mark_link* old = next_raw;
2846 // Claim failed because being weak processed (state == "weak request").
2847 // Try to request deferred strong processing.
2848 next_raw = oops_do_try_add_strong_request(old);
2849 if (next_raw == old) {
2850 // Successfully requested deferred strong processing.
2851 return;
2852 }
2853 // Failed because of a concurrent transition. No longer in "weak request" state.
2854 }
2855 if (oops_do_has_any_strong_state(next_raw)) {
2856 // Already claimed for strong processing or requested for such.
2857 return;
2858 }
2859 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2860 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2861 p->do_remaining_strong_processing(this);
2862 return;
2863 }
2864 // Claim failed, some other thread got it.
2865 }
2866
2867 void nmethod::oops_do_marking_prologue() {
2868 assert_at_safepoint();
2869
2870 log_trace(gc, nmethod)("oops_do_marking_prologue");
2871 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2872 }
2873
2874 void nmethod::oops_do_marking_epilogue() {
2875 assert_at_safepoint();
2876
2877 nmethod* next = _oops_do_mark_nmethods;
2878 _oops_do_mark_nmethods = nullptr;
2879 if (next != nullptr) {
2880 nmethod* cur;
2881 do {
2882 cur = next;
2883 next = extract_nmethod(cur->_oops_do_mark_link);
2884 cur->_oops_do_mark_link = nullptr;
2885 DEBUG_ONLY(cur->verify_oop_relocations());
2886
2887 LogTarget(Trace, gc, nmethod) lt;
2888 if (lt.is_enabled()) {
2889 LogStream ls(lt);
2890 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2891 }
2892 // End if self-loop has been detected.
2893 } while (cur != next);
2894 }
2895 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2896 }
2897
2898 inline bool includes(void* p, void* from, void* to) {
2899 return from <= p && p < to;
2900 }
2901
2902
2903 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2904 assert(count >= 2, "must be sentinel values, at least");
2905
2906 #ifdef ASSERT
2907 // must be sorted and unique; we do a binary search in find_pc_desc()
2908 int prev_offset = pcs[0].pc_offset();
2909 assert(prev_offset == PcDesc::lower_offset_limit,
2910 "must start with a sentinel");
2911 for (int i = 1; i < count; i++) {
2912 int this_offset = pcs[i].pc_offset();
2913 assert(this_offset > prev_offset, "offsets must be sorted");
2914 prev_offset = this_offset;
2915 }
2916 assert(prev_offset == PcDesc::upper_offset_limit,
2917 "must end with a sentinel");
2918 #endif //ASSERT
2919
2920 int size = count * sizeof(PcDesc);
2921 assert(scopes_pcs_size() >= size, "oob");
2922 memcpy(scopes_pcs_begin(), pcs, size);
2923
2924 // Adjust the final sentinel downward.
2925 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2926 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2927 last_pc->set_pc_offset(content_size() + 1);
2928 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2929 // Fill any rounding gaps with copies of the last record.
2930 last_pc[1] = last_pc[0];
2931 }
2932 // The following assert could fail if sizeof(PcDesc) is not
2933 // an integral multiple of oopSize (the rounding term).
2934 // If it fails, change the logic to always allocate a multiple
2935 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2936 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2937 }
2938
2939 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2940 assert(scopes_data_size() >= size, "oob");
2941 memcpy(scopes_data_begin(), buffer, size);
2942 }
2943
2944 #ifdef ASSERT
2945 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2946 PcDesc* res = nullptr;
2947 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2948 "must start with a sentinel");
2949 // lower + 1 to exclude initial sentinel
2950 for (PcDesc* p = lower + 1; p < upper; p++) {
2951 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2952 if (match_desc(p, pc_offset, approximate)) {
2953 if (res == nullptr) {
2954 res = p;
2955 } else {
2956 res = (PcDesc*) badAddress;
2957 }
2958 }
2959 }
2960 return res;
2961 }
2962 #endif
2963
2964
2965 #ifndef PRODUCT
2966 // Version of method to collect statistic
2967 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2968 PcDesc* lower, PcDesc* upper) {
2969 ++pc_nmethod_stats.pc_desc_queries;
2970 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2971
2972 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2973 assert(desc != nullptr, "PcDesc cache should be initialized already");
2974 if (desc->pc_offset() == (pc - code_begin)) {
2975 // Cached value matched
2976 ++pc_nmethod_stats.pc_desc_tests;
2977 ++pc_nmethod_stats.pc_desc_repeats;
2978 return desc;
2979 }
2980 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2981 }
2982 #endif
2983
2984 // Finds a PcDesc with real-pc equal to "pc"
2985 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2986 PcDesc* lower_incl, PcDesc* upper_incl) {
2987 if ((pc < code_begin) ||
2988 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2989 return nullptr; // PC is wildly out of range
2990 }
2991 int pc_offset = (int) (pc - code_begin);
2992
2993 // Check the PcDesc cache if it contains the desired PcDesc
2994 // (This as an almost 100% hit rate.)
2995 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2996 if (res != nullptr) {
2997 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2998 return res;
2999 }
3000
3001 // Fallback algorithm: quasi-linear search for the PcDesc
3002 // Find the last pc_offset less than the given offset.
3003 // The successor must be the required match, if there is a match at all.
3004 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
3005 PcDesc* lower = lower_incl; // this is initial sentinel
3006 PcDesc* upper = upper_incl - 1; // exclude final sentinel
3007 if (lower >= upper) return nullptr; // no PcDescs at all
3008
3009 #define assert_LU_OK \
3010 /* invariant on lower..upper during the following search: */ \
3011 assert(lower->pc_offset() < pc_offset, "sanity"); \
3012 assert(upper->pc_offset() >= pc_offset, "sanity")
3013 assert_LU_OK;
3014
3015 // Use the last successful return as a split point.
3016 PcDesc* mid = _pc_desc_cache.last_pc_desc();
3017 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3018 if (mid->pc_offset() < pc_offset) {
3019 lower = mid;
3020 } else {
3021 upper = mid;
3022 }
3023
3024 // Take giant steps at first (4096, then 256, then 16, then 1)
3025 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3026 const int RADIX = (1 << LOG2_RADIX);
3027 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3028 while ((mid = lower + step) < upper) {
3029 assert_LU_OK;
3030 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3031 if (mid->pc_offset() < pc_offset) {
3032 lower = mid;
3033 } else {
3034 upper = mid;
3035 break;
3036 }
3037 }
3038 assert_LU_OK;
3039 }
3040
3041 // Sneak up on the value with a linear search of length ~16.
3042 while (true) {
3043 assert_LU_OK;
3044 mid = lower + 1;
3045 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3046 if (mid->pc_offset() < pc_offset) {
3047 lower = mid;
3048 } else {
3049 upper = mid;
3050 break;
3051 }
3052 }
3053 #undef assert_LU_OK
3054
3055 if (match_desc(upper, pc_offset, approximate)) {
3056 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3057 if (!Thread::current_in_asgct()) {
3058 // we don't want to modify the cache if we're in ASGCT
3059 // which is typically called in a signal handler
3060 _pc_desc_cache.add_pc_desc(upper);
3061 }
3062 return upper;
3063 } else {
3064 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3065 return nullptr;
3066 }
3067 }
3068
3069 bool nmethod::check_dependency_on(DepChange& changes) {
3070 // What has happened:
3071 // 1) a new class dependee has been added
3072 // 2) dependee and all its super classes have been marked
3073 bool found_check = false; // set true if we are upset
3074 for (Dependencies::DepStream deps(this); deps.next(); ) {
3075 // Evaluate only relevant dependencies.
3076 if (deps.spot_check_dependency_at(changes) != nullptr) {
3077 found_check = true;
3078 NOT_DEBUG(break);
3079 }
3080 }
3081 return found_check;
3082 }
3083
3084 // Called from mark_for_deoptimization, when dependee is invalidated.
3085 bool nmethod::is_dependent_on_method(Method* dependee) {
3086 for (Dependencies::DepStream deps(this); deps.next(); ) {
3087 if (deps.type() != Dependencies::evol_method)
3088 continue;
3089 Method* method = deps.method_argument(0);
3090 if (method == dependee) return true;
3091 }
3092 return false;
3093 }
3094
3095 void nmethod_init() {
3096 // make sure you didn't forget to adjust the filler fields
3097 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3098 }
3099
3100 // -----------------------------------------------------------------------------
3101 // Verification
3102
3103 class VerifyOopsClosure: public OopClosure {
3104 nmethod* _nm;
3105 bool _ok;
3106 public:
3107 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3108 bool ok() { return _ok; }
3109 virtual void do_oop(oop* p) {
3110 if (oopDesc::is_oop_or_null(*p)) return;
3111 // Print diagnostic information before calling print_nmethod().
3112 // Assertions therein might prevent call from returning.
3113 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3114 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3115 if (_ok) {
3116 _nm->print_nmethod(true);
3117 _ok = false;
3118 }
3119 }
3120 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3121 };
3122
3123 class VerifyMetadataClosure: public MetadataClosure {
3124 public:
3125 void do_metadata(Metadata* md) {
3126 if (md->is_method()) {
3127 Method* method = (Method*)md;
3128 assert(!method->is_old(), "Should not be installing old methods");
3129 }
3130 }
3131 };
3132
3133
3134 void nmethod::verify() {
3135 if (is_not_entrant())
3136 return;
3137
3138 // assert(oopDesc::is_oop(method()), "must be valid");
3139
3140 ResourceMark rm;
3141
3142 if (!CodeCache::contains(this)) {
3143 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3144 }
3145
3146 if(is_native_method() )
3147 return;
3148
3149 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3150 if (nm != this) {
3151 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3152 }
3153
3154 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3155 if (! p->verify(this)) {
3156 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3157 }
3158 }
3159
3160 VerifyOopsClosure voc(this);
3161 oops_do(&voc);
3162 assert(voc.ok(), "embedded oops must be OK");
3163 Universe::heap()->verify_nmethod(this);
3164
3165 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3166 nm->method()->external_name(), p2i(_oops_do_mark_link));
3167 verify_scopes();
3168
3169 CompiledICLocker nm_verify(this);
3170 VerifyMetadataClosure vmc;
3171 metadata_do(&vmc);
3172 }
3173
3174
3175 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3176
3177 // Verify IC only when nmethod installation is finished.
3178 if (!is_not_installed()) {
3179 if (CompiledICLocker::is_safe(this)) {
3180 if (is_inline_cache) {
3181 CompiledIC_at(this, call_site);
3182 } else {
3183 CompiledDirectCall::at(call_site);
3184 }
3185 } else {
3186 CompiledICLocker ml_verify(this);
3187 if (is_inline_cache) {
3188 CompiledIC_at(this, call_site);
3189 } else {
3190 CompiledDirectCall::at(call_site);
3191 }
3192 }
3193 }
3194
3195 HandleMark hm(Thread::current());
3196
3197 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3198 assert(pd != nullptr, "PcDesc must exist");
3199 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3200 !sd->is_top(); sd = sd->sender()) {
3201 sd->verify();
3202 }
3203 }
3204
3205 void nmethod::verify_scopes() {
3206 if( !method() ) return; // Runtime stubs have no scope
3207 if (method()->is_native()) return; // Ignore stub methods.
3208 // iterate through all interrupt point
3209 // and verify the debug information is valid.
3210 RelocIterator iter(this);
3211 while (iter.next()) {
3212 address stub = nullptr;
3213 switch (iter.type()) {
3214 case relocInfo::virtual_call_type:
3215 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3216 break;
3217 case relocInfo::opt_virtual_call_type:
3218 stub = iter.opt_virtual_call_reloc()->static_stub();
3219 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3220 break;
3221 case relocInfo::static_call_type:
3222 stub = iter.static_call_reloc()->static_stub();
3223 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3224 break;
3225 case relocInfo::runtime_call_type:
3226 case relocInfo::runtime_call_w_cp_type: {
3227 address destination = iter.reloc()->value();
3228 // Right now there is no way to find out which entries support
3229 // an interrupt point. It would be nice if we had this
3230 // information in a table.
3231 break;
3232 }
3233 default:
3234 break;
3235 }
3236 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3237 }
3238 }
3239
3240
3241 // -----------------------------------------------------------------------------
3242 // Printing operations
3243
3244 void nmethod::print_on_impl(outputStream* st) const {
3245 ResourceMark rm;
3246
3247 st->print("Compiled method ");
3248
3249 if (is_compiled_by_c1()) {
3250 st->print("(c1) ");
3251 } else if (is_compiled_by_c2()) {
3252 st->print("(c2) ");
3253 } else {
3254 st->print("(n/a) ");
3255 }
3256
3257 print_on_with_msg(st, nullptr);
3258
3259 if (WizardMode) {
3260 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3261 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3262 st->print(" { ");
3263 st->print_cr("%s ", state());
3264 st->print_cr("}:");
3265 }
3266 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3267 p2i(this),
3268 p2i(this) + size(),
3269 size());
3270 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3271 p2i(consts_begin()),
3272 p2i(consts_end()),
3273 consts_size());
3274 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3275 p2i(insts_begin()),
3276 p2i(insts_end()),
3277 insts_size());
3278 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3279 p2i(stub_begin()),
3280 p2i(stub_end()),
3281 stub_size());
3282 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3283 p2i(oops_begin()),
3284 p2i(oops_end()),
3285 oops_size());
3286 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3287 p2i(mutable_data_begin()),
3288 p2i(mutable_data_end()),
3289 mutable_data_size());
3290 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3291 p2i(relocation_begin()),
3292 p2i(relocation_end()),
3293 relocation_size());
3294 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3295 p2i(metadata_begin()),
3296 p2i(metadata_end()),
3297 metadata_size());
3298 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3299 p2i(immutable_data_begin()),
3300 p2i(immutable_data_end()),
3301 immutable_data_size());
3302 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3303 p2i(dependencies_begin()),
3304 p2i(dependencies_end()),
3305 dependencies_size());
3306 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3307 p2i(nul_chk_table_begin()),
3308 p2i(nul_chk_table_end()),
3309 nul_chk_table_size());
3310 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3311 p2i(handler_table_begin()),
3312 p2i(handler_table_end()),
3313 handler_table_size());
3314 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3315 p2i(scopes_pcs_begin()),
3316 p2i(scopes_pcs_end()),
3317 scopes_pcs_size());
3318 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3319 p2i(scopes_data_begin()),
3320 p2i(scopes_data_end()),
3321 scopes_data_size());
3322 }
3323
3324 void nmethod::print_code() {
3325 ResourceMark m;
3326 ttyLocker ttyl;
3327 // Call the specialized decode method of this class.
3328 decode(tty);
3329 }
3330
3331 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3332
3333 void nmethod::print_dependencies_on(outputStream* out) {
3334 ResourceMark rm;
3335 stringStream st;
3336 st.print_cr("Dependencies:");
3337 for (Dependencies::DepStream deps(this); deps.next(); ) {
3338 deps.print_dependency(&st);
3339 InstanceKlass* ctxk = deps.context_type();
3340 if (ctxk != nullptr) {
3341 if (ctxk->is_dependent_nmethod(this)) {
3342 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3343 }
3344 }
3345 deps.log_dependency(); // put it into the xml log also
3346 }
3347 out->print_raw(st.as_string());
3348 }
3349 #endif
3350
3351 #if defined(SUPPORT_DATA_STRUCTS)
3352
3353 // Print the oops from the underlying CodeBlob.
3354 void nmethod::print_oops(outputStream* st) {
3355 ResourceMark m;
3356 st->print("Oops:");
3357 if (oops_begin() < oops_end()) {
3358 st->cr();
3359 for (oop* p = oops_begin(); p < oops_end(); p++) {
3360 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3361 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3362 if (Universe::contains_non_oop_word(p)) {
3363 st->print_cr("NON_OOP");
3364 continue; // skip non-oops
3365 }
3366 if (*p == nullptr) {
3367 st->print_cr("nullptr-oop");
3368 continue; // skip non-oops
3369 }
3370 (*p)->print_value_on(st);
3371 st->cr();
3372 }
3373 } else {
3374 st->print_cr(" <list empty>");
3375 }
3376 }
3377
3378 // Print metadata pool.
3379 void nmethod::print_metadata(outputStream* st) {
3380 ResourceMark m;
3381 st->print("Metadata:");
3382 if (metadata_begin() < metadata_end()) {
3383 st->cr();
3384 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3385 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3386 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3387 if (*p && *p != Universe::non_oop_word()) {
3388 (*p)->print_value_on(st);
3389 }
3390 st->cr();
3391 }
3392 } else {
3393 st->print_cr(" <list empty>");
3394 }
3395 }
3396
3397 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3398 void nmethod::print_scopes_on(outputStream* st) {
3399 // Find the first pc desc for all scopes in the code and print it.
3400 ResourceMark rm;
3401 st->print("scopes:");
3402 if (scopes_pcs_begin() < scopes_pcs_end()) {
3403 st->cr();
3404 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3405 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3406 continue;
3407
3408 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3409 while (sd != nullptr) {
3410 sd->print_on(st, p); // print output ends with a newline
3411 sd = sd->sender();
3412 }
3413 }
3414 } else {
3415 st->print_cr(" <list empty>");
3416 }
3417 }
3418 #endif
3419
3420 #ifndef PRODUCT // RelocIterator does support printing only then.
3421 void nmethod::print_relocations() {
3422 ResourceMark m; // in case methods get printed via the debugger
3423 tty->print_cr("relocations:");
3424 RelocIterator iter(this);
3425 iter.print_on(tty);
3426 }
3427 #endif
3428
3429 void nmethod::print_pcs_on(outputStream* st) {
3430 ResourceMark m; // in case methods get printed via debugger
3431 st->print("pc-bytecode offsets:");
3432 if (scopes_pcs_begin() < scopes_pcs_end()) {
3433 st->cr();
3434 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3435 p->print_on(st, this); // print output ends with a newline
3436 }
3437 } else {
3438 st->print_cr(" <list empty>");
3439 }
3440 }
3441
3442 void nmethod::print_handler_table() {
3443 ExceptionHandlerTable(this).print(code_begin());
3444 }
3445
3446 void nmethod::print_nul_chk_table() {
3447 ImplicitExceptionTable(this).print(code_begin());
3448 }
3449
3450 void nmethod::print_recorded_oop(int log_n, int i) {
3451 void* value;
3452
3453 if (i == 0) {
3454 value = nullptr;
3455 } else {
3456 // Be careful around non-oop words. Don't create an oop
3457 // with that value, or it will assert in verification code.
3458 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3459 value = Universe::non_oop_word();
3460 } else {
3461 value = oop_at(i);
3462 }
3463 }
3464
3465 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3466
3467 if (value == Universe::non_oop_word()) {
3468 tty->print("non-oop word");
3469 } else {
3470 if (value == nullptr) {
3471 tty->print("nullptr-oop");
3472 } else {
3473 oop_at(i)->print_value_on(tty);
3474 }
3475 }
3476
3477 tty->cr();
3478 }
3479
3480 void nmethod::print_recorded_oops() {
3481 const int n = oops_count();
3482 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3483 tty->print("Recorded oops:");
3484 if (n > 0) {
3485 tty->cr();
3486 for (int i = 0; i < n; i++) {
3487 print_recorded_oop(log_n, i);
3488 }
3489 } else {
3490 tty->print_cr(" <list empty>");
3491 }
3492 }
3493
3494 void nmethod::print_recorded_metadata() {
3495 const int n = metadata_count();
3496 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3497 tty->print("Recorded metadata:");
3498 if (n > 0) {
3499 tty->cr();
3500 for (int i = 0; i < n; i++) {
3501 Metadata* m = metadata_at(i);
3502 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3503 if (m == (Metadata*)Universe::non_oop_word()) {
3504 tty->print("non-metadata word");
3505 } else if (m == nullptr) {
3506 tty->print("nullptr-oop");
3507 } else {
3508 Metadata::print_value_on_maybe_null(tty, m);
3509 }
3510 tty->cr();
3511 }
3512 } else {
3513 tty->print_cr(" <list empty>");
3514 }
3515 }
3516 #endif
3517
3518 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3519
3520 void nmethod::print_constant_pool(outputStream* st) {
3521 //-----------------------------------
3522 //---< Print the constant pool >---
3523 //-----------------------------------
3524 int consts_size = this->consts_size();
3525 if ( consts_size > 0 ) {
3526 unsigned char* cstart = this->consts_begin();
3527 unsigned char* cp = cstart;
3528 unsigned char* cend = cp + consts_size;
3529 unsigned int bytes_per_line = 4;
3530 unsigned int CP_alignment = 8;
3531 unsigned int n;
3532
3533 st->cr();
3534
3535 //---< print CP header to make clear what's printed >---
3536 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3537 n = bytes_per_line;
3538 st->print_cr("[Constant Pool]");
3539 Disassembler::print_location(cp, cstart, cend, st, true, true);
3540 Disassembler::print_hexdata(cp, n, st, true);
3541 st->cr();
3542 } else {
3543 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3544 st->print_cr("[Constant Pool (unaligned)]");
3545 }
3546
3547 //---< print CP contents, bytes_per_line at a time >---
3548 while (cp < cend) {
3549 Disassembler::print_location(cp, cstart, cend, st, true, false);
3550 Disassembler::print_hexdata(cp, n, st, false);
3551 cp += n;
3552 n = bytes_per_line;
3553 st->cr();
3554 }
3555
3556 //---< Show potential alignment gap between constant pool and code >---
3557 cend = code_begin();
3558 if( cp < cend ) {
3559 n = 4;
3560 st->print_cr("[Code entry alignment]");
3561 while (cp < cend) {
3562 Disassembler::print_location(cp, cstart, cend, st, false, false);
3563 cp += n;
3564 st->cr();
3565 }
3566 }
3567 } else {
3568 st->print_cr("[Constant Pool (empty)]");
3569 }
3570 st->cr();
3571 }
3572
3573 #endif
3574
3575 // Disassemble this nmethod.
3576 // Print additional debug information, if requested. This could be code
3577 // comments, block comments, profiling counters, etc.
3578 // The undisassembled format is useful no disassembler library is available.
3579 // The resulting hex dump (with markers) can be disassembled later, or on
3580 // another system, when/where a disassembler library is available.
3581 void nmethod::decode2(outputStream* ost) const {
3582
3583 // Called from frame::back_trace_with_decode without ResourceMark.
3584 ResourceMark rm;
3585
3586 // Make sure we have a valid stream to print on.
3587 outputStream* st = ost ? ost : tty;
3588
3589 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3590 const bool use_compressed_format = true;
3591 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3592 AbstractDisassembler::show_block_comment());
3593 #else
3594 const bool use_compressed_format = Disassembler::is_abstract();
3595 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3596 AbstractDisassembler::show_block_comment());
3597 #endif
3598
3599 st->cr();
3600 this->print_on(st);
3601 st->cr();
3602
3603 #if defined(SUPPORT_ASSEMBLY)
3604 //----------------------------------
3605 //---< Print real disassembly >---
3606 //----------------------------------
3607 if (! use_compressed_format) {
3608 st->print_cr("[Disassembly]");
3609 Disassembler::decode(const_cast<nmethod*>(this), st);
3610 st->bol();
3611 st->print_cr("[/Disassembly]");
3612 return;
3613 }
3614 #endif
3615
3616 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3617
3618 // Compressed undisassembled disassembly format.
3619 // The following status values are defined/supported:
3620 // = 0 - currently at bol() position, nothing printed yet on current line.
3621 // = 1 - currently at position after print_location().
3622 // > 1 - in the midst of printing instruction stream bytes.
3623 int compressed_format_idx = 0;
3624 int code_comment_column = 0;
3625 const int instr_maxlen = Assembler::instr_maxlen();
3626 const uint tabspacing = 8;
3627 unsigned char* start = this->code_begin();
3628 unsigned char* p = this->code_begin();
3629 unsigned char* end = this->code_end();
3630 unsigned char* pss = p; // start of a code section (used for offsets)
3631
3632 if ((start == nullptr) || (end == nullptr)) {
3633 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3634 return;
3635 }
3636 #endif
3637
3638 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3639 //---< plain abstract disassembly, no comments or anything, just section headers >---
3640 if (use_compressed_format && ! compressed_with_comments) {
3641 const_cast<nmethod*>(this)->print_constant_pool(st);
3642
3643 st->bol();
3644 st->cr();
3645 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3646 //---< Open the output (Marker for post-mortem disassembler) >---
3647 st->print_cr("[MachCode]");
3648 const char* header = nullptr;
3649 address p0 = p;
3650 while (p < end) {
3651 address pp = p;
3652 while ((p < end) && (header == nullptr)) {
3653 header = nmethod_section_label(p);
3654 pp = p;
3655 p += Assembler::instr_len(p);
3656 }
3657 if (pp > p0) {
3658 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3659 p0 = pp;
3660 p = pp;
3661 header = nullptr;
3662 } else if (header != nullptr) {
3663 st->bol();
3664 st->print_cr("%s", header);
3665 header = nullptr;
3666 }
3667 }
3668 //---< Close the output (Marker for post-mortem disassembler) >---
3669 st->bol();
3670 st->print_cr("[/MachCode]");
3671 return;
3672 }
3673 #endif
3674
3675 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3676 //---< abstract disassembly with comments and section headers merged in >---
3677 if (compressed_with_comments) {
3678 const_cast<nmethod*>(this)->print_constant_pool(st);
3679
3680 st->bol();
3681 st->cr();
3682 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3683 //---< Open the output (Marker for post-mortem disassembler) >---
3684 st->print_cr("[MachCode]");
3685 while ((p < end) && (p != nullptr)) {
3686 const int instruction_size_in_bytes = Assembler::instr_len(p);
3687
3688 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3689 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3690 // Prints nmethod_section_label as well.
3691 if (AbstractDisassembler::show_block_comment()) {
3692 print_block_comment(st, p);
3693 if (st->position() == 0) {
3694 compressed_format_idx = 0;
3695 }
3696 }
3697
3698 //---< New location information after line break >---
3699 if (compressed_format_idx == 0) {
3700 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3701 compressed_format_idx = 1;
3702 }
3703
3704 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3705 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3706 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3707
3708 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3709 //---< interrupt instruction byte stream for code comment >---
3710 if (compressed_format_idx > 1) {
3711 st->cr(); // interrupt byte stream
3712 st->cr(); // add an empty line
3713 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3714 }
3715 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3716 st->bol();
3717 compressed_format_idx = 0;
3718 }
3719
3720 //---< New location information after line break >---
3721 if (compressed_format_idx == 0) {
3722 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3723 compressed_format_idx = 1;
3724 }
3725
3726 //---< Nicely align instructions for readability >---
3727 if (compressed_format_idx > 1) {
3728 Disassembler::print_delimiter(st);
3729 }
3730
3731 //---< Now, finally, print the actual instruction bytes >---
3732 unsigned char* p0 = p;
3733 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3734 compressed_format_idx += (int)(p - p0);
3735
3736 if (Disassembler::start_newline(compressed_format_idx-1)) {
3737 st->cr();
3738 compressed_format_idx = 0;
3739 }
3740 }
3741 //---< Close the output (Marker for post-mortem disassembler) >---
3742 st->bol();
3743 st->print_cr("[/MachCode]");
3744 return;
3745 }
3746 #endif
3747 }
3748
3749 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3750
3751 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3752 RelocIterator iter(this, begin, end);
3753 bool have_one = false;
3754 while (iter.next()) {
3755 have_one = true;
3756 switch (iter.type()) {
3757 case relocInfo::none: {
3758 // Skip it and check next
3759 break;
3760 }
3761 case relocInfo::oop_type: {
3762 // Get a non-resizable resource-allocated stringStream.
3763 // Our callees make use of (nested) ResourceMarks.
3764 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3765 oop_Relocation* r = iter.oop_reloc();
3766 oop obj = r->oop_value();
3767 st.print("oop(");
3768 if (obj == nullptr) st.print("nullptr");
3769 else obj->print_value_on(&st);
3770 st.print(")");
3771 return st.as_string();
3772 }
3773 case relocInfo::metadata_type: {
3774 stringStream st;
3775 metadata_Relocation* r = iter.metadata_reloc();
3776 Metadata* obj = r->metadata_value();
3777 st.print("metadata(");
3778 if (obj == nullptr) st.print("nullptr");
3779 else obj->print_value_on(&st);
3780 st.print(")");
3781 return st.as_string();
3782 }
3783 case relocInfo::runtime_call_type:
3784 case relocInfo::runtime_call_w_cp_type: {
3785 stringStream st;
3786 st.print("runtime_call");
3787 CallRelocation* r = (CallRelocation*)iter.reloc();
3788 address dest = r->destination();
3789 if (StubRoutines::contains(dest)) {
3790 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3791 if (desc != nullptr) {
3792 st.print(" Stub::%s", desc->name());
3793 return st.as_string();
3794 }
3795 }
3796 CodeBlob* cb = CodeCache::find_blob(dest);
3797 if (cb != nullptr) {
3798 st.print(" %s", cb->name());
3799 } else {
3800 ResourceMark rm;
3801 const int buflen = 1024;
3802 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3803 int offset;
3804 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3805 st.print(" %s", buf);
3806 if (offset != 0) {
3807 st.print("+%d", offset);
3808 }
3809 }
3810 }
3811 return st.as_string();
3812 }
3813 case relocInfo::virtual_call_type: {
3814 stringStream st;
3815 st.print_raw("virtual_call");
3816 virtual_call_Relocation* r = iter.virtual_call_reloc();
3817 Method* m = r->method_value();
3818 if (m != nullptr) {
3819 assert(m->is_method(), "");
3820 m->print_short_name(&st);
3821 }
3822 return st.as_string();
3823 }
3824 case relocInfo::opt_virtual_call_type: {
3825 stringStream st;
3826 st.print_raw("optimized virtual_call");
3827 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3828 Method* m = r->method_value();
3829 if (m != nullptr) {
3830 assert(m->is_method(), "");
3831 m->print_short_name(&st);
3832 }
3833 return st.as_string();
3834 }
3835 case relocInfo::static_call_type: {
3836 stringStream st;
3837 st.print_raw("static_call");
3838 static_call_Relocation* r = iter.static_call_reloc();
3839 Method* m = r->method_value();
3840 if (m != nullptr) {
3841 assert(m->is_method(), "");
3842 m->print_short_name(&st);
3843 }
3844 return st.as_string();
3845 }
3846 case relocInfo::static_stub_type: return "static_stub";
3847 case relocInfo::external_word_type: return "external_word";
3848 case relocInfo::internal_word_type: return "internal_word";
3849 case relocInfo::section_word_type: return "section_word";
3850 case relocInfo::poll_type: return "poll";
3851 case relocInfo::poll_return_type: return "poll_return";
3852 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3853 case relocInfo::entry_guard_type: return "entry_guard";
3854 case relocInfo::post_call_nop_type: return "post_call_nop";
3855 case relocInfo::barrier_type: {
3856 barrier_Relocation* const reloc = iter.barrier_reloc();
3857 stringStream st;
3858 st.print("barrier format=%d", reloc->format());
3859 return st.as_string();
3860 }
3861 case relocInfo::patchable_barrier_type: {
3862 patchable_barrier_Relocation* const reloc = iter.patchable_barrier_reloc();
3863 stringStream st;
3864 st.print("patchable_barrier metadata=%d", reloc->metadata());
3865 return st.as_string();
3866 }
3867
3868 case relocInfo::type_mask: return "type_bit_mask";
3869
3870 default: {
3871 stringStream st;
3872 st.print("unknown relocInfo=%d", (int) iter.type());
3873 return st.as_string();
3874 }
3875 }
3876 }
3877 return have_one ? "other" : nullptr;
3878 }
3879
3880 // Return the last scope in (begin..end]
3881 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3882 PcDesc* p = pc_desc_near(begin+1);
3883 if (p != nullptr && p->real_pc(this) <= end) {
3884 return new ScopeDesc(this, p);
3885 }
3886 return nullptr;
3887 }
3888
3889 const char* nmethod::nmethod_section_label(address pos) const {
3890 const char* label = nullptr;
3891 if (pos == code_begin()) label = "[Instructions begin]";
3892 if (pos == entry_point()) label = "[Entry Point]";
3893 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3894 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3895 // Check stub_code before checking exception_handler or deopt_handler.
3896 if (pos == this->stub_begin()) label = "[Stub Code]";
3897 if (pos == exception_begin()) label = "[Exception Handler]";
3898 if (pos == deopt_handler_entry()) label = "[Deopt Handler Entry Point]";
3899 return label;
3900 }
3901
3902 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3903 if (print_section_labels) {
3904 const char* label = nmethod_section_label(block_begin);
3905 if (label != nullptr) {
3906 stream->bol();
3907 stream->print_cr("%s", label);
3908 }
3909 }
3910
3911 if (block_begin == entry_point()) {
3912 Method* m = method();
3913 if (m != nullptr) {
3914 stream->print(" # ");
3915 m->print_value_on(stream);
3916 stream->cr();
3917 }
3918 if (m != nullptr && !is_osr_method()) {
3919 ResourceMark rm;
3920 int sizeargs = m->size_of_parameters();
3921 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3922 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3923 {
3924 int sig_index = 0;
3925 if (!m->is_static())
3926 sig_bt[sig_index++] = T_OBJECT; // 'this'
3927 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3928 BasicType t = ss.type();
3929 sig_bt[sig_index++] = t;
3930 if (type2size[t] == 2) {
3931 sig_bt[sig_index++] = T_VOID;
3932 } else {
3933 assert(type2size[t] == 1, "size is 1 or 2");
3934 }
3935 }
3936 assert(sig_index == sizeargs, "");
3937 }
3938 const char* spname = "sp"; // make arch-specific?
3939 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3940 int stack_slot_offset = this->frame_size() * wordSize;
3941 int tab1 = 14, tab2 = 24;
3942 int sig_index = 0;
3943 int arg_index = (m->is_static() ? 0 : -1);
3944 bool did_old_sp = false;
3945 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3946 bool at_this = (arg_index == -1);
3947 bool at_old_sp = false;
3948 BasicType t = (at_this ? T_OBJECT : ss.type());
3949 assert(t == sig_bt[sig_index], "sigs in sync");
3950 if (at_this)
3951 stream->print(" # this: ");
3952 else
3953 stream->print(" # parm%d: ", arg_index);
3954 stream->move_to(tab1);
3955 VMReg fst = regs[sig_index].first();
3956 VMReg snd = regs[sig_index].second();
3957 if (fst->is_reg()) {
3958 stream->print("%s", fst->name());
3959 if (snd->is_valid()) {
3960 stream->print(":%s", snd->name());
3961 }
3962 } else if (fst->is_stack()) {
3963 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3964 if (offset == stack_slot_offset) at_old_sp = true;
3965 stream->print("[%s+0x%x]", spname, offset);
3966 } else {
3967 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3968 }
3969 stream->print(" ");
3970 stream->move_to(tab2);
3971 stream->print("= ");
3972 if (at_this) {
3973 m->method_holder()->print_value_on(stream);
3974 } else {
3975 bool did_name = false;
3976 if (!at_this && ss.is_reference()) {
3977 Symbol* name = ss.as_symbol();
3978 name->print_value_on(stream);
3979 did_name = true;
3980 }
3981 if (!did_name)
3982 stream->print("%s", type2name(t));
3983 }
3984 if (at_old_sp) {
3985 stream->print(" (%s of caller)", spname);
3986 did_old_sp = true;
3987 }
3988 stream->cr();
3989 sig_index += type2size[t];
3990 arg_index += 1;
3991 if (!at_this) ss.next();
3992 }
3993 if (!did_old_sp) {
3994 stream->print(" # ");
3995 stream->move_to(tab1);
3996 stream->print("[%s+0x%x]", spname, stack_slot_offset);
3997 stream->print(" (%s of caller)", spname);
3998 stream->cr();
3999 }
4000 }
4001 }
4002 }
4003
4004 // Returns whether this nmethod has code comments.
4005 bool nmethod::has_code_comment(address begin, address end) {
4006 // scopes?
4007 ScopeDesc* sd = scope_desc_in(begin, end);
4008 if (sd != nullptr) return true;
4009
4010 // relocations?
4011 const char* str = reloc_string_for(begin, end);
4012 if (str != nullptr) return true;
4013
4014 // implicit exceptions?
4015 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4016 if (cont_offset != 0) return true;
4017
4018 return false;
4019 }
4020
4021 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4022 ImplicitExceptionTable implicit_table(this);
4023 int pc_offset = (int)(begin - code_begin());
4024 int cont_offset = implicit_table.continuation_offset(pc_offset);
4025 bool oop_map_required = false;
4026 if (cont_offset != 0) {
4027 st->move_to(column, 6, 0);
4028 if (pc_offset == cont_offset) {
4029 st->print("; implicit exception: deoptimizes");
4030 oop_map_required = true;
4031 } else {
4032 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4033 }
4034 }
4035
4036 // Find an oopmap in (begin, end]. We use the odd half-closed
4037 // interval so that oop maps and scope descs which are tied to the
4038 // byte after a call are printed with the call itself. OopMaps
4039 // associated with implicit exceptions are printed with the implicit
4040 // instruction.
4041 address base = code_begin();
4042 ImmutableOopMapSet* oms = oop_maps();
4043 if (oms != nullptr) {
4044 for (int i = 0, imax = oms->count(); i < imax; i++) {
4045 const ImmutableOopMapPair* pair = oms->pair_at(i);
4046 const ImmutableOopMap* om = pair->get_from(oms);
4047 address pc = base + pair->pc_offset();
4048 if (pc >= begin) {
4049 if (pc > begin && pc <= end) {
4050 st->move_to(column, 6, 0);
4051 st->print("; ");
4052 om->print_on(st);
4053 oop_map_required = false;
4054 }
4055 }
4056 if (pc > end) {
4057 break;
4058 }
4059 }
4060 }
4061 assert(!oop_map_required, "missed oopmap");
4062
4063 Thread* thread = Thread::current();
4064
4065 // Print any debug info present at this pc.
4066 ScopeDesc* sd = scope_desc_in(begin, end);
4067 if (sd != nullptr) {
4068 st->move_to(column, 6, 0);
4069 if (sd->bci() == SynchronizationEntryBCI) {
4070 st->print(";*synchronization entry");
4071 } else if (sd->bci() == AfterBci) {
4072 st->print(";* method exit (unlocked if synchronized)");
4073 } else if (sd->bci() == UnwindBci) {
4074 st->print(";* unwind (locked if synchronized)");
4075 } else if (sd->bci() == AfterExceptionBci) {
4076 st->print(";* unwind (unlocked if synchronized)");
4077 } else if (sd->bci() == UnknownBci) {
4078 st->print(";* unknown");
4079 } else if (sd->bci() == InvalidFrameStateBci) {
4080 st->print(";* invalid frame state");
4081 } else {
4082 if (sd->method() == nullptr) {
4083 st->print("method is nullptr");
4084 } else if (sd->method()->is_native()) {
4085 st->print("method is native");
4086 } else {
4087 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4088 st->print(";*%s", Bytecodes::name(bc));
4089 switch (bc) {
4090 case Bytecodes::_invokevirtual:
4091 case Bytecodes::_invokespecial:
4092 case Bytecodes::_invokestatic:
4093 case Bytecodes::_invokeinterface:
4094 {
4095 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4096 st->print(" ");
4097 if (invoke.name() != nullptr)
4098 invoke.name()->print_symbol_on(st);
4099 else
4100 st->print("<UNKNOWN>");
4101 break;
4102 }
4103 case Bytecodes::_getfield:
4104 case Bytecodes::_putfield:
4105 case Bytecodes::_getstatic:
4106 case Bytecodes::_putstatic:
4107 {
4108 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4109 st->print(" ");
4110 if (field.name() != nullptr)
4111 field.name()->print_symbol_on(st);
4112 else
4113 st->print("<UNKNOWN>");
4114 }
4115 default:
4116 break;
4117 }
4118 }
4119 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4120 }
4121
4122 // Print all scopes
4123 for (;sd != nullptr; sd = sd->sender()) {
4124 st->move_to(column, 6, 0);
4125 st->print("; -");
4126 if (sd->should_reexecute()) {
4127 st->print(" (reexecute)");
4128 }
4129 if (sd->method() == nullptr) {
4130 st->print("method is nullptr");
4131 } else {
4132 sd->method()->print_short_name(st);
4133 }
4134 int lineno = sd->method()->line_number_from_bci(sd->bci());
4135 if (lineno != -1) {
4136 st->print("@%d (line %d)", sd->bci(), lineno);
4137 } else {
4138 st->print("@%d", sd->bci());
4139 }
4140 st->cr();
4141 }
4142 }
4143
4144 // Print relocation information
4145 // Prevent memory leak: allocating without ResourceMark.
4146 ResourceMark rm;
4147 const char* str = reloc_string_for(begin, end);
4148 if (str != nullptr) {
4149 if (sd != nullptr) st->cr();
4150 st->move_to(column, 6, 0);
4151 st->print("; {%s}", str);
4152 }
4153 }
4154
4155 #endif
4156
4157 address nmethod::call_instruction_address(address pc) const {
4158 if (NativeCall::is_call_before(pc)) {
4159 NativeCall *ncall = nativeCall_before(pc);
4160 return ncall->instruction_address();
4161 }
4162 return nullptr;
4163 }
4164
4165 void nmethod::print_value_on_impl(outputStream* st) const {
4166 st->print_cr("nmethod");
4167 #if defined(SUPPORT_DATA_STRUCTS)
4168 print_on_with_msg(st, nullptr);
4169 #endif
4170 }
4171
4172 void nmethod::print_code_snippet(outputStream* st, address addr) const {
4173 if (entry_point() <= addr && addr < code_end()) {
4174 // Pointing into the nmethod's code. Try to disassemble some instructions around addr.
4175 // Determine conservative start and end points.
4176 address start;
4177 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
4178 addr >= code_begin() + frame_complete_offset()) {
4179 start = code_begin() + frame_complete_offset();
4180 } else {
4181 start = (addr < verified_entry_point()) ? entry_point() : verified_entry_point();
4182 }
4183 address start_for_hex_dump = start; // We can choose a different starting point for hex dump, below.
4184 address end = code_end();
4185
4186 // Try using relocations to find closer instruction start and end points.
4187 // (Some platforms have variable length instructions and can only
4188 // disassemble correctly at instruction start addresses.)
4189 RelocIterator iter((nmethod*)this, start);
4190 while (iter.next() && iter.addr() < addr) { // find relocation before addr
4191 // Note: There's a relocation which doesn't point to an instruction start:
4192 // ZBarrierRelocationFormatStoreGoodAfterMov with ZGC on x86_64
4193 // We could detect and skip it, but hex dump is still usable when
4194 // disassembler produces garbage in such a very rare case.
4195 start = iter.addr();
4196 // We want at least 64 Bytes ahead in hex dump.
4197 if (iter.addr() <= (addr - 64)) start_for_hex_dump = iter.addr();
4198 }
4199 if (iter.has_current()) {
4200 if (iter.addr() == addr) iter.next(); // find relocation after addr
4201 if (iter.has_current()) end = iter.addr();
4202 }
4203
4204 // Always print hex. Disassembler may still have problems when hitting an incorrect instruction start.
4205 os::print_hex_dump(st, start_for_hex_dump, end, 1, /* print_ascii=*/false);
4206 if (!Disassembler::is_abstract()) {
4207 Disassembler::decode(start, end, st);
4208 }
4209 }
4210 }
4211
4212 #ifndef PRODUCT
4213
4214 void nmethod::print_calls(outputStream* st) {
4215 RelocIterator iter(this);
4216 while (iter.next()) {
4217 switch (iter.type()) {
4218 case relocInfo::virtual_call_type: {
4219 CompiledICLocker ml_verify(this);
4220 CompiledIC_at(&iter)->print();
4221 break;
4222 }
4223 case relocInfo::static_call_type:
4224 case relocInfo::opt_virtual_call_type:
4225 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4226 CompiledDirectCall::at(iter.reloc())->print();
4227 break;
4228 default:
4229 break;
4230 }
4231 }
4232 }
4233
4234 void nmethod::print_statistics() {
4235 ttyLocker ttyl;
4236 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4237 native_nmethod_stats.print_native_nmethod_stats();
4238 #ifdef COMPILER1
4239 c1_java_nmethod_stats.print_nmethod_stats("C1");
4240 #endif
4241 #ifdef COMPILER2
4242 c2_java_nmethod_stats.print_nmethod_stats("C2");
4243 #endif
4244 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4245 DebugInformationRecorder::print_statistics();
4246 pc_nmethod_stats.print_pc_stats();
4247 Dependencies::print_statistics();
4248 ExternalsRecorder::print_statistics();
4249 if (xtty != nullptr) xtty->tail("statistics");
4250 }
4251
4252 #endif // !PRODUCT