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
692 // If inline types are passed as fields, use the extended signature
693 // which contains the types of all (oop) fields of the inline type.
694 if (is_compiled_by_c2() && callee->has_scalarized_args()) {
695 const GrowableArray<SigEntry>* sig = callee->adapter()->get_sig_cc();
696 assert(sig != nullptr, "sig should never be null");
697 TempNewSymbol tmp_sig = SigEntry::create_symbol(sig);
698 has_receiver = false; // The extended signature contains the receiver type
699 fr.oops_compiled_arguments_do(tmp_sig, has_receiver, has_appendix, reg_map, f);
700 return;
701 }
702 } else {
703 SimpleScopeDesc ssd(this, pc);
704
705 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
706 has_receiver = call.has_receiver();
707 has_appendix = call.has_appendix();
708 signature = call.signature();
709 }
710
711 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
712 } else if (method()->is_continuation_enter_intrinsic()) {
713 // This method only calls Continuation.enter()
714 Symbol* signature = vmSymbols::continuationEnter_signature();
715 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
716 }
717 }
718
719 Method* nmethod::attached_method(address call_instr) {
720 assert(code_contains(call_instr), "not part of the nmethod");
721 RelocIterator iter(this, call_instr, call_instr + 1);
722 while (iter.next()) {
723 if (iter.addr() == call_instr) {
724 switch(iter.type()) {
725 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
726 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
727 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
728 default: break;
729 }
730 }
731 }
732 return nullptr; // not found
733 }
734
735 Method* nmethod::attached_method_before_pc(address pc) {
736 if (NativeCall::is_call_before(pc)) {
737 NativeCall* ncall = nativeCall_before(pc);
738 return attached_method(ncall->instruction_address());
739 }
740 return nullptr; // not a call
741 }
742
743 void nmethod::clear_inline_caches() {
744 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");
745 RelocIterator iter(this);
746 while (iter.next()) {
747 iter.reloc()->clear_inline_cache();
748 }
749 }
750
751 #ifdef ASSERT
752 // Check class_loader is alive for this bit of metadata.
753 class CheckClass : public MetadataClosure {
754 void do_metadata(Metadata* md) {
755 Klass* klass = nullptr;
756 if (md->is_klass()) {
757 klass = ((Klass*)md);
758 } else if (md->is_method()) {
759 klass = ((Method*)md)->method_holder();
760 } else if (md->is_methodData()) {
761 klass = ((MethodData*)md)->method()->method_holder();
762 } else if (md->is_methodCounters()) {
763 klass = ((MethodCounters*)md)->method()->method_holder();
764 } else {
765 md->print();
766 ShouldNotReachHere();
767 }
768 assert(klass->is_loader_alive(), "must be alive");
769 }
770 };
771 #endif // ASSERT
772
773 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
774 template <typename CallsiteT>
775 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, bool clean_all) {
776 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
777 if (!cb->is_nmethod()) {
778 return;
779 }
780 nmethod* nm = cb->as_nmethod();
781 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
782 callsite->set_to_clean();
783 }
784 }
785
786 // Cleans caches in nmethods that point to either classes that are unloaded
787 // or nmethods that are unloaded.
788 //
789 // Can be called either in parallel by G1 currently or after all
790 // nmethods are unloaded. Return postponed=true in the parallel case for
791 // inline caches found that point to nmethods that are not yet visited during
792 // the do_unloading walk.
793 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
794 ResourceMark rm;
795
796 // Exception cache only needs to be called if unloading occurred
797 if (unloading_occurred) {
798 clean_exception_cache();
799 }
800
801 cleanup_inline_caches_impl(unloading_occurred, false);
802
803 #ifdef ASSERT
804 // Check that the metadata embedded in the nmethod is alive
805 CheckClass check_class;
806 metadata_do(&check_class);
807 #endif
808 }
809
810 void nmethod::run_nmethod_entry_barrier() {
811 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
812 if (bs_nm != nullptr) {
813 // We want to keep an invariant that nmethods found through iterations of a Thread's
814 // nmethods found in safepoints have gone through an entry barrier and are not armed.
815 // By calling this nmethod entry barrier, it plays along and acts
816 // like any other nmethod found on the stack of a thread (fewer surprises).
817 nmethod* nm = this;
818 bool alive = bs_nm->nmethod_entry_barrier(nm);
819 assert(alive, "should be alive");
820 }
821 }
822
823 // Only called by whitebox test
824 void nmethod::cleanup_inline_caches_whitebox() {
825 assert_locked_or_safepoint(CodeCache_lock);
826 CompiledICLocker ic_locker(this);
827 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
828 }
829
830 address* nmethod::orig_pc_addr(const frame* fr) {
831 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
832 }
833
834 // Called to clean up after class unloading for live nmethods
835 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
836 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
837 ResourceMark rm;
838
839 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
840 RelocIterator iter(this, oops_reloc_begin());
841 bool is_in_static_stub = false;
842 while(iter.next()) {
843
844 switch (iter.type()) {
845
846 case relocInfo::virtual_call_type:
847 if (unloading_occurred) {
848 // If class unloading occurred we first clear ICs where the cached metadata
849 // is referring to an unloaded klass or method.
850 CompiledIC_at(&iter)->clean_metadata();
851 }
852
853 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), clean_all);
854 break;
855
856 case relocInfo::opt_virtual_call_type:
857 case relocInfo::static_call_type:
858 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), clean_all);
859 break;
860
861 case relocInfo::static_stub_type: {
862 is_in_static_stub = true;
863 break;
864 }
865
866 case relocInfo::metadata_type: {
867 // Only the metadata relocations contained in static/opt virtual call stubs
868 // contains the Method* passed to c2i adapters. It is the only metadata
869 // relocation that needs to be walked, as it is the one metadata relocation
870 // that violates the invariant that all metadata relocations have an oop
871 // in the compiled method (due to deferred resolution and code patching).
872
873 // This causes dead metadata to remain in compiled methods that are not
874 // unloading. Unless these slippery metadata relocations of the static
875 // stubs are at least cleared, subsequent class redefinition operations
876 // will access potentially free memory, and JavaThread execution
877 // concurrent to class unloading may call c2i adapters with dead methods.
878 if (!is_in_static_stub) {
879 // The first metadata relocation after a static stub relocation is the
880 // metadata relocation of the static stub used to pass the Method* to
881 // c2i adapters.
882 continue;
883 }
884 is_in_static_stub = false;
885 if (is_unloading()) {
886 // If the nmethod itself is dying, then it may point at dead metadata.
887 // Nobody should follow that metadata; it is strictly unsafe.
888 continue;
889 }
890 metadata_Relocation* r = iter.metadata_reloc();
891 Metadata* md = r->metadata_value();
892 if (md != nullptr && md->is_method()) {
893 Method* method = static_cast<Method*>(md);
894 if (!method->method_holder()->is_loader_alive()) {
895 AtomicAccess::store(r->metadata_addr(), (Method*)nullptr);
896
897 if (!r->metadata_is_immediate()) {
898 r->fix_metadata_relocation();
899 }
900 }
901 }
902 break;
903 }
904
905 default:
906 break;
907 }
908 }
909 }
910
911 address nmethod::continuation_for_implicit_exception(address pc) {
912 // Exception happened outside inline-cache check code => we are inside
913 // an active nmethod => use cpc to determine a return address
914 int exception_offset = int(pc - code_begin());
915 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
916 #ifdef ASSERT
917 if (cont_offset == 0) {
918 Thread* thread = Thread::current();
919 ResourceMark rm(thread);
920 CodeBlob* cb = CodeCache::find_blob(pc);
921 assert(cb != nullptr && cb == this, "");
922
923 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
924 stringStream ss;
925 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
926 print_on(&ss);
927 // Buffering to a stringStream, disable internal buffering so it's not done twice.
928 method()->print_codes_on(&ss, 0, false);
929 print_code_on(&ss);
930 print_pcs_on(&ss);
931 tty->print("%s", ss.as_string()); // print all at once
932 }
933 #endif
934 if (cont_offset == 0) {
935 // Let the normal error handling report the exception
936 return nullptr;
937 }
938 guarantee(cont_offset != exception_offset, "continuation offset and exception offset must be different");
939 return code_begin() + cont_offset;
940 }
941
942 class HasEvolDependency : public MetadataClosure {
943 bool _has_evol_dependency;
944 public:
945 HasEvolDependency() : _has_evol_dependency(false) {}
946 void do_metadata(Metadata* md) {
947 if (md->is_method()) {
948 Method* method = (Method*)md;
949 if (method->is_old()) {
950 _has_evol_dependency = true;
951 }
952 }
953 }
954 bool has_evol_dependency() const { return _has_evol_dependency; }
955 };
956
957 bool nmethod::has_evol_metadata() {
958 // Check the metadata in relocIter and CompiledIC and also deoptimize
959 // any nmethod that has reference to old methods.
960 HasEvolDependency check_evol;
961 metadata_do(&check_evol);
962 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
963 ResourceMark rm;
964 log_debug(redefine, class, nmethod)
965 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
966 _method->method_holder()->external_name(),
967 _method->name()->as_C_string(),
968 _method->signature()->as_C_string(),
969 compile_id());
970 }
971 return check_evol.has_evol_dependency();
972 }
973
974 int nmethod::total_size() const {
975 return
976 consts_size() +
977 insts_size() +
978 stub_size() +
979 scopes_data_size() +
980 scopes_pcs_size() +
981 handler_table_size() +
982 nul_chk_table_size();
983 }
984
985 const char* nmethod::compile_kind() const {
986 if (is_osr_method()) return "osr";
987 if (method() != nullptr && is_native_method()) {
988 if (method()->is_continuation_native_intrinsic()) {
989 return "cnt";
990 }
991 return "c2n";
992 }
993 return nullptr;
994 }
995
996 const char* nmethod::compiler_name() const {
997 return compilertype2name(_compiler_type);
998 }
999
1000 #ifdef ASSERT
1001 class CheckForOopsClosure : public OopClosure {
1002 bool _found_oop = false;
1003 public:
1004 virtual void do_oop(oop* o) { _found_oop = true; }
1005 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1006 bool found_oop() { return _found_oop; }
1007 };
1008 class CheckForMetadataClosure : public MetadataClosure {
1009 bool _found_metadata = false;
1010 Metadata* _ignore = nullptr;
1011 public:
1012 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1013 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1014 bool found_metadata() { return _found_metadata; }
1015 };
1016
1017 static void assert_no_oops_or_metadata(nmethod* nm) {
1018 if (nm == nullptr) return;
1019 assert(nm->oop_maps() == nullptr, "expectation");
1020
1021 CheckForOopsClosure cfo;
1022 nm->oops_do(&cfo);
1023 assert(!cfo.found_oop(), "no oops allowed");
1024
1025 // We allow an exception for the own Method, but require its class to be permanent.
1026 Method* own_method = nm->method();
1027 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1028 nm->metadata_do(&cfm);
1029 assert(!cfm.found_metadata(), "no metadata allowed");
1030
1031 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1032 "Method's class needs to be permanent");
1033 }
1034 #endif
1035
1036 static int required_mutable_data_size(CodeBuffer* code_buffer) {
1037 return align_up(code_buffer->total_relocation_size(), oopSize) +
1038 align_up(code_buffer->total_metadata_size(), oopSize);
1039 }
1040
1041 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1042 int compile_id,
1043 CodeBuffer *code_buffer,
1044 int vep_offset,
1045 int frame_complete,
1046 int frame_size,
1047 ByteSize basic_lock_owner_sp_offset,
1048 ByteSize basic_lock_sp_offset,
1049 OopMapSet* oop_maps,
1050 int exception_handler) {
1051 code_buffer->finalize_oop_references(method);
1052 // create nmethod
1053 nmethod* nm = nullptr;
1054 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1055 {
1056 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1057
1058 CodeOffsets offsets;
1059 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1060 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1061 if (exception_handler != -1) {
1062 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1063 }
1064
1065 int mutable_data_size = required_mutable_data_size(code_buffer);
1066
1067 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1068 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1069 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1070 nm = new (native_nmethod_size, allow_NonNMethod_space)
1071 nmethod(method(), compiler_none, native_nmethod_size,
1072 compile_id, &offsets,
1073 code_buffer, frame_size,
1074 basic_lock_owner_sp_offset,
1075 basic_lock_sp_offset,
1076 oop_maps, mutable_data_size);
1077 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1078 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1079 }
1080
1081 if (nm != nullptr) {
1082 // verify nmethod
1083 DEBUG_ONLY(nm->verify();) // might block
1084
1085 nm->log_new_nmethod();
1086 }
1087 return nm;
1088 }
1089
1090 nmethod* nmethod::new_nmethod(const methodHandle& method,
1091 int compile_id,
1092 int entry_bci,
1093 CodeOffsets* offsets,
1094 int orig_pc_offset,
1095 DebugInformationRecorder* debug_info,
1096 Dependencies* dependencies,
1097 CodeBuffer* code_buffer, int frame_size,
1098 OopMapSet* oop_maps,
1099 ExceptionHandlerTable* handler_table,
1100 ImplicitExceptionTable* nul_chk_table,
1101 AbstractCompiler* compiler,
1102 CompLevel comp_level,
1103 Flags flags)
1104 {
1105 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1106 code_buffer->finalize_oop_references(method);
1107 // create nmethod
1108 nmethod* nm = nullptr;
1109 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1110
1111 int immutable_data_size =
1112 adjust_pcs_size(debug_info->pcs_size())
1113 + align_up((int)dependencies->size_in_bytes(), oopSize)
1114 + align_up(handler_table->size_in_bytes() , oopSize)
1115 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1116 + align_up(debug_info->data_size() , oopSize);
1117
1118 // First, allocate space for immutable data in C heap.
1119 address immutable_data = nullptr;
1120 if (immutable_data_size > 0) {
1121 immutable_data_size += ImmutableDataRefCountSize;
1122 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1123 if (immutable_data == nullptr) {
1124 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1125 return nullptr;
1126 }
1127 }
1128
1129 int mutable_data_size = required_mutable_data_size(code_buffer);
1130
1131 {
1132 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1133
1134 nm = new (nmethod_size, comp_level)
1135 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1136 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1137 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1138 handler_table, nul_chk_table, compiler, comp_level, flags);
1139
1140 if (nm != nullptr) {
1141 // To make dependency checking during class loading fast, record
1142 // the nmethod dependencies in the classes it is dependent on.
1143 // This allows the dependency checking code to simply walk the
1144 // class hierarchy above the loaded class, checking only nmethods
1145 // which are dependent on those classes. The slow way is to
1146 // check every nmethod for dependencies which makes it linear in
1147 // the number of methods compiled. For applications with a lot
1148 // classes the slow way is too slow.
1149 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1150 if (deps.type() == Dependencies::call_site_target_value) {
1151 // CallSite dependencies are managed on per-CallSite instance basis.
1152 oop call_site = deps.argument_oop(0);
1153 MethodHandles::add_dependent_nmethod(call_site, nm);
1154 } else {
1155 InstanceKlass* ik = deps.context_type();
1156 if (ik == nullptr) {
1157 continue; // ignore things like evol_method
1158 }
1159 // record this nmethod as dependent on this klass
1160 ik->add_dependent_nmethod(nm);
1161 }
1162 }
1163 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm));
1164 }
1165 }
1166 // Do verification and logging outside CodeCache_lock.
1167 if (nm != nullptr) {
1168 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1169 DEBUG_ONLY(nm->verify();)
1170 nm->log_new_nmethod();
1171 }
1172 return nm;
1173 }
1174
1175 // Fill in default values for various fields
1176 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1177 // avoid uninitialized fields, even for short time periods
1178 _exception_cache = nullptr;
1179 _gc_data = nullptr;
1180 _oops_do_mark_link = nullptr;
1181 _compiled_ic_data = nullptr;
1182
1183 _is_unloading_state = 0;
1184 _state = not_installed;
1185
1186 _has_flushed_dependencies = false;
1187 _is_unlinked = false;
1188 _load_reported = false; // jvmti state
1189
1190 _deoptimization_status = not_marked;
1191
1192 // SECT_CONSTS is first in code buffer so the offset should be 0.
1193 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1194 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1195
1196 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1197
1198 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1199 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1200
1201 _inline_entry_offset = _entry_offset;
1202 _verified_inline_entry_offset = _verified_entry_offset;
1203 _verified_inline_ro_entry_offset = _verified_entry_offset;
1204
1205 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1206 }
1207
1208 // Post initialization
1209 void nmethod::post_init() {
1210 clear_unloading_state();
1211
1212 finalize_relocations();
1213
1214 // Flush generated code
1215 ICache::invalidate_range(code_begin(), code_size());
1216
1217 Universe::heap()->register_nmethod(this);
1218
1219 #ifdef COMPILER2
1220 HotCodeCollector::register_nmethod(this);
1221 #endif // COMPILER2
1222
1223 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1224
1225 CodeCache::commit(this);
1226 }
1227
1228 // For native wrappers
1229 nmethod::nmethod(
1230 Method* method,
1231 CompilerType type,
1232 int nmethod_size,
1233 int compile_id,
1234 CodeOffsets* offsets,
1235 CodeBuffer* code_buffer,
1236 int frame_size,
1237 ByteSize basic_lock_owner_sp_offset,
1238 ByteSize basic_lock_sp_offset,
1239 OopMapSet* oop_maps,
1240 int mutable_data_size)
1241 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1242 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1243 _deoptimization_generation(0),
1244 _gc_epoch(CodeCache::gc_epoch()),
1245 _method(method),
1246 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1247 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1248 {
1249 {
1250 DEBUG_ONLY(NoSafepointVerifier nsv;)
1251 assert_locked_or_safepoint(CodeCache_lock);
1252 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet");
1253 init_defaults(code_buffer, offsets);
1254
1255 _osr_entry_point = nullptr;
1256 _pc_desc_container = nullptr;
1257 _entry_bci = InvocationEntryBci;
1258 _compile_id = compile_id;
1259 _comp_level = CompLevel_none;
1260 _compiler_type = type;
1261 _orig_pc_offset = 0;
1262 _num_stack_arg_slots = 0;
1263
1264 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1265 // Continuation enter intrinsic
1266 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1267 } else {
1268 _exception_offset = 0;
1269 }
1270 // Native wrappers do not have deopt handlers. Make the values
1271 // something that will never match a pc like the nmethod vtable entry
1272 _deopt_handler_entry_offset = 0;
1273 _unwind_handler_offset = 0;
1274
1275 int metadata_size = align_up(code_buffer->total_metadata_size(), wordSize);
1276 assert(_mutable_data_size == _relocation_size + metadata_size,
1277 "wrong mutable data size: %d != %d + %d",
1278 _mutable_data_size, _relocation_size, metadata_size);
1279
1280 // native wrapper does not have read-only data but we need unique not null address
1281 _immutable_data = blob_end();
1282 _immutable_data_size = 0;
1283 _nul_chk_table_offset = 0;
1284 _handler_table_offset = 0;
1285 _scopes_pcs_offset = 0;
1286 _scopes_data_offset = 0;
1287 _immutable_data_ref_count_offset = 0;
1288
1289 code_buffer->copy_code_and_locs_to(this);
1290 code_buffer->copy_values_to(this);
1291
1292 post_init();
1293 }
1294
1295 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1296 ttyLocker ttyl; // keep the following output all in one block
1297 // This output goes directly to the tty, not the compiler log.
1298 // To enable tools to match it up with the compilation activity,
1299 // be sure to tag this tty output with the compile ID.
1300 if (xtty != nullptr) {
1301 xtty->begin_head("print_native_nmethod");
1302 xtty->method(_method);
1303 xtty->stamp();
1304 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1305 }
1306 // Print the header part, then print the requested information.
1307 // This is both handled in decode2(), called via print_code() -> decode()
1308 if (PrintNativeNMethods) {
1309 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1310 print_code();
1311 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1312 #if defined(SUPPORT_DATA_STRUCTS)
1313 if (AbstractDisassembler::show_structs()) {
1314 if (oop_maps != nullptr) {
1315 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1316 oop_maps->print_on(tty);
1317 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1318 }
1319 }
1320 #endif
1321 } else {
1322 print(); // print the header part only.
1323 }
1324 #if defined(SUPPORT_DATA_STRUCTS)
1325 if (AbstractDisassembler::show_structs()) {
1326 if (PrintRelocations) {
1327 print_relocations();
1328 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1329 }
1330 }
1331 #endif
1332 if (xtty != nullptr) {
1333 xtty->tail("print_native_nmethod");
1334 }
1335 }
1336 }
1337
1338
1339 nmethod::nmethod(const nmethod &nm) : CodeBlob(nm._name, nm._kind, nm._size, nm._header_size),
1340 _flags(nm._flags)
1341 {
1342
1343 if (nm._oop_maps != nullptr) {
1344 _oop_maps = nm._oop_maps->clone();
1345 } else {
1346 _oop_maps = nullptr;
1347 }
1348
1349 _size = nm._size;
1350 _relocation_size = nm._relocation_size;
1351 _content_offset = nm._content_offset;
1352 _code_offset = nm._code_offset;
1353 _data_offset = nm._data_offset;
1354 _frame_size = nm._frame_size;
1355
1356 S390_ONLY( _ctable_offset = nm._ctable_offset; )
1357
1358 _header_size = nm._header_size;
1359 _frame_complete_offset = nm._frame_complete_offset;
1360
1361 _kind = nm._kind;
1362
1363 _caller_must_gc_arguments = nm._caller_must_gc_arguments;
1364
1365 #ifndef PRODUCT
1366 _asm_remarks.share(nm._asm_remarks);
1367 _dbg_strings.share(nm._dbg_strings);
1368 #endif
1369
1370 // Allocate memory and copy mutable data to C heap
1371 _mutable_data_size = nm._mutable_data_size;
1372 if (_mutable_data_size > 0) {
1373 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
1374 if (_mutable_data == nullptr) {
1375 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for mutable data");
1376 }
1377 memcpy(mutable_data_begin(), nm.mutable_data_begin(), nm.mutable_data_size());
1378 } else {
1379 _mutable_data = nullptr;
1380 }
1381
1382 _deoptimization_generation = 0;
1383 _gc_epoch = CodeCache::gc_epoch();
1384 _method = nm._method;
1385 _osr_link = nullptr;
1386
1387 _exception_cache = nullptr;
1388 _gc_data = nullptr;
1389 _oops_do_mark_nmethods = nullptr;
1390 _oops_do_mark_link = nullptr;
1391 _compiled_ic_data = nullptr;
1392
1393 // Relocate the OSR entry point from nm to the new nmethod.
1394 if (nm._osr_entry_point == nullptr) {
1395 _osr_entry_point = nullptr;
1396 } else {
1397 address new_addr = nm._osr_entry_point - (address) &nm + (address) this;
1398 assert(new_addr >= code_begin() && new_addr < code_end(),
1399 "relocated address must be within code bounds");
1400 _osr_entry_point = new_addr;
1401 }
1402 _entry_offset = nm._entry_offset;
1403 _verified_entry_offset = nm._verified_entry_offset;
1404 _inline_entry_offset = nm._inline_entry_offset;
1405 _verified_inline_entry_offset = nm._verified_inline_entry_offset;
1406 _verified_inline_ro_entry_offset = nm._verified_inline_ro_entry_offset;
1407
1408 _entry_bci = nm._entry_bci;
1409 _immutable_data_size = nm._immutable_data_size;
1410
1411 _skipped_instructions_size = nm._skipped_instructions_size;
1412 _stub_offset = nm._stub_offset;
1413 _exception_offset = nm._exception_offset;
1414 _deopt_handler_entry_offset = nm._deopt_handler_entry_offset;
1415 _unwind_handler_offset = nm._unwind_handler_offset;
1416 _num_stack_arg_slots = nm._num_stack_arg_slots;
1417 _nul_chk_table_offset = nm._nul_chk_table_offset;
1418 _handler_table_offset = nm._handler_table_offset;
1419 _scopes_pcs_offset = nm._scopes_pcs_offset;
1420 _scopes_data_offset = nm._scopes_data_offset;
1421 _immutable_data_ref_count_offset = nm._immutable_data_ref_count_offset;
1422
1423 // Increment number of references to immutable data to share it between nmethods
1424 if (_immutable_data_size > 0) {
1425 _immutable_data = nm._immutable_data;
1426 inc_immutable_data_ref_count();
1427 } else {
1428 _immutable_data = blob_end();
1429 }
1430
1431 _orig_pc_offset = nm._orig_pc_offset;
1432 _compile_id = nm._compile_id;
1433 _comp_level = nm._comp_level;
1434 _compiler_type = nm._compiler_type;
1435 _is_unloading_state = nm._is_unloading_state;
1436 _state = not_installed;
1437
1438 _has_flushed_dependencies = nm._has_flushed_dependencies;
1439 _is_unlinked = nm._is_unlinked;
1440 _load_reported = nm._load_reported;
1441
1442 _deoptimization_status = nm._deoptimization_status;
1443
1444 if (nm._pc_desc_container != nullptr) {
1445 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1446 } else {
1447 _pc_desc_container = nullptr;
1448 }
1449
1450 // Copy nmethod contents excluding header
1451 // - Constant part (doubles, longs and floats used in nmethod)
1452 // - Code part:
1453 // - Code body
1454 // - Exception handler
1455 // - Stub code
1456 // - OOP table
1457 memcpy(consts_begin(), nm.consts_begin(), nm.data_end() - nm.consts_begin());
1458
1459 // Fix relocation
1460 RelocIterator iter(this);
1461 CodeBuffer src(&nm);
1462 CodeBuffer dst(this);
1463 while (iter.next()) {
1464 #ifdef USE_TRAMPOLINE_STUB_FIX_OWNER
1465 // After an nmethod is moved, some direct call sites may end up out of range.
1466 // CallRelocation::fix_relocation_after_move() assumes the target is always
1467 // reachable and does not check branch range. Calling it without range checks
1468 // could cause us to write an offset too large for the instruction.
1469 //
1470 // If a call site has a trampoline, we skip the normal call relocation. The
1471 // associated trampoline_stub_Relocation will handle the call and the
1472 // trampoline, including range checks and updating the branch as needed.
1473 //
1474 // If no trampoline exists, we can assume the call target is always
1475 // reachable and therefore within direct branch range, so calling
1476 // CallRelocation::fix_relocation_after_move() is safe.
1477 if (iter.reloc()->is_call()) {
1478 address trampoline = trampoline_stub_Relocation::get_trampoline_for(iter.reloc()->addr(), this);
1479 if (trampoline != nullptr) {
1480 continue;
1481 }
1482 }
1483 #endif
1484
1485 iter.reloc()->fix_relocation_after_move(&src, &dst);
1486 }
1487
1488 {
1489 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1490 clear_inline_caches();
1491 }
1492
1493 post_init();
1494 }
1495
1496 nmethod* nmethod::relocate(CodeBlobType code_blob_type) {
1497 assert(NMethodRelocation, "must enable use of function");
1498
1499 // Locks required to be held by caller to ensure the nmethod
1500 // is not modified or purged from code cache during relocation
1501 assert_lock_strong(CodeCache_lock);
1502 assert_lock_strong(Compile_lock);
1503 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1504
1505 if (!is_relocatable()) {
1506 return nullptr;
1507 }
1508
1509 run_nmethod_entry_barrier();
1510 nmethod* nm_copy = new (size(), code_blob_type) nmethod(*this);
1511
1512 if (nm_copy == nullptr) {
1513 return nullptr;
1514 }
1515
1516 // To make dependency checking during class loading fast, record
1517 // the nmethod dependencies in the classes it is dependent on.
1518 // This allows the dependency checking code to simply walk the
1519 // class hierarchy above the loaded class, checking only nmethods
1520 // which are dependent on those classes. The slow way is to
1521 // check every nmethod for dependencies which makes it linear in
1522 // the number of methods compiled. For applications with a lot
1523 // classes the slow way is too slow.
1524 for (Dependencies::DepStream deps(nm_copy); deps.next(); ) {
1525 if (deps.type() == Dependencies::call_site_target_value) {
1526 // CallSite dependencies are managed on per-CallSite instance basis.
1527 oop call_site = deps.argument_oop(0);
1528 MethodHandles::add_dependent_nmethod(call_site, nm_copy);
1529 } else {
1530 InstanceKlass* ik = deps.context_type();
1531 if (ik == nullptr) {
1532 continue; // ignore things like evol_method
1533 }
1534 // record this nmethod as dependent on this klass
1535 ik->add_dependent_nmethod(nm_copy);
1536 }
1537 }
1538
1539 MutexLocker ml_NMethodState_lock(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1540
1541 // Verify the nm we copied from is still valid
1542 if (!is_marked_for_deoptimization() && is_in_use()) {
1543 assert(method() != nullptr && method()->code() == this, "should be if is in use");
1544
1545 // Attempt to start using the copy
1546 if (nm_copy->make_in_use()) {
1547 methodHandle mh(Thread::current(), nm_copy->method());
1548 nm_copy->method()->set_code(mh, nm_copy);
1549
1550 make_not_entrant(InvalidationReason::RELOCATED);
1551
1552 nm_copy->post_compiled_method_load_event();
1553
1554 nm_copy->log_relocated_nmethod(this);
1555
1556 return nm_copy;
1557 }
1558 }
1559
1560 nm_copy->make_not_used();
1561
1562 return nullptr;
1563 }
1564
1565 bool nmethod::is_relocatable() {
1566 if (!is_java_method()) {
1567 return false;
1568 }
1569
1570 if (!is_in_use()) {
1571 return false;
1572 }
1573
1574 if (is_osr_method()) {
1575 return false;
1576 }
1577
1578 if (is_marked_for_deoptimization()) {
1579 return false;
1580 }
1581
1582 if (is_unloading()) {
1583 return false;
1584 }
1585
1586 if (has_evol_metadata()) {
1587 return false;
1588 }
1589
1590 return true;
1591 }
1592
1593 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1594 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1595 }
1596
1597 void* nmethod::operator new(size_t size, int nmethod_size, CodeBlobType code_blob_type) throw () {
1598 return CodeCache::allocate(nmethod_size, code_blob_type);
1599 }
1600
1601 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1602 // Try MethodNonProfiled and MethodProfiled.
1603 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1604 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1605 // Try NonNMethod or give up.
1606 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1607 }
1608
1609 // For normal JIT compiled code
1610 nmethod::nmethod(
1611 Method* method,
1612 CompilerType type,
1613 int nmethod_size,
1614 int immutable_data_size,
1615 int mutable_data_size,
1616 int compile_id,
1617 int entry_bci,
1618 address immutable_data,
1619 CodeOffsets* offsets,
1620 int orig_pc_offset,
1621 DebugInformationRecorder* debug_info,
1622 Dependencies* dependencies,
1623 CodeBuffer *code_buffer,
1624 int frame_size,
1625 OopMapSet* oop_maps,
1626 ExceptionHandlerTable* handler_table,
1627 ImplicitExceptionTable* nul_chk_table,
1628 AbstractCompiler* compiler,
1629 CompLevel comp_level,
1630 Flags flags)
1631 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1632 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1633 _deoptimization_generation(0),
1634 _gc_epoch(CodeCache::gc_epoch()),
1635 _method(method),
1636 _osr_link(nullptr),
1637 _flags(flags)
1638 {
1639 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1640 {
1641 DEBUG_ONLY(NoSafepointVerifier nsv;)
1642 assert_locked_or_safepoint(CodeCache_lock);
1643
1644 init_defaults(code_buffer, offsets);
1645
1646 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1647 _entry_bci = entry_bci;
1648 _compile_id = compile_id;
1649 _comp_level = comp_level;
1650 _compiler_type = type;
1651 _orig_pc_offset = orig_pc_offset;
1652
1653 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1654
1655 set_ctable_begin(header_begin() + content_offset());
1656
1657 // Exception handler and deopt handler are in the stub section
1658 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1659
1660 bool has_exception_handler = (offsets->value(CodeOffsets::Exceptions) != -1);
1661 assert(has_exception_handler == (compiler->type() != compiler_c2),
1662 "C2 compiler doesn't provide exception handler stub code.");
1663 if (has_exception_handler) {
1664 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1665 } else {
1666 _exception_offset = -1;
1667 }
1668
1669 _deopt_handler_entry_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1670
1671 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1672 // C1 generates UnwindHandler at the end of instructions section.
1673 // Calculate positive offset as distance between the start of stubs section
1674 // (which is also the end of instructions section) and the start of the handler.
1675 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1676 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1677 } else {
1678 _unwind_handler_offset = -1;
1679 }
1680
1681 int metadata_size = align_up(code_buffer->total_metadata_size(), wordSize);
1682 if (offsets->value(CodeOffsets::Inline_Entry) != CodeOffsets::no_such_entry_point) {
1683 CHECKED_CAST(_inline_entry_offset , uint16_t, offsets->value(CodeOffsets::Inline_Entry));
1684 }
1685 if (offsets->value(CodeOffsets::Verified_Inline_Entry) != CodeOffsets::no_such_entry_point) {
1686 CHECKED_CAST(_verified_inline_entry_offset , uint16_t, offsets->value(CodeOffsets::Verified_Inline_Entry));
1687 }
1688 if (offsets->value(CodeOffsets::Verified_Inline_Entry_RO) != CodeOffsets::no_such_entry_point) {
1689 CHECKED_CAST(_verified_inline_ro_entry_offset, uint16_t, offsets->value(CodeOffsets::Verified_Inline_Entry_RO));
1690 }
1691
1692 assert(_mutable_data_size == _relocation_size + metadata_size,
1693 "wrong mutable data size: %d != %d + %d",
1694 _mutable_data_size, _relocation_size, metadata_size);
1695 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1696 nmethod_size, (int)(code_end() - header_begin()));
1697
1698 _immutable_data_size = immutable_data_size;
1699 if (immutable_data_size > 0) {
1700 assert(immutable_data != nullptr, "required");
1701 _immutable_data = immutable_data;
1702 } else {
1703 // We need unique not null address
1704 _immutable_data = blob_end();
1705 }
1706 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1707 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1708 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1709 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1710
1711 _immutable_data_ref_count_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1712 DEBUG_ONLY( int immutable_data_end_offset = _immutable_data_ref_count_offset + ImmutableDataRefCountSize; )
1713 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1714 immutable_data_end_offset, immutable_data_size);
1715
1716 // Copy code and relocation info
1717 code_buffer->copy_code_and_locs_to(this);
1718 // Copy oops and metadata
1719 code_buffer->copy_values_to(this);
1720 dependencies->copy_to(this);
1721 // Copy PcDesc and ScopeDesc data
1722 debug_info->copy_to(this);
1723
1724 // Create cache after PcDesc data is copied - it will be used to initialize cache
1725 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1726
1727 // Copy contents of ExceptionHandlerTable to nmethod
1728 handler_table->copy_to(this);
1729 nul_chk_table->copy_to(this);
1730
1731 init_immutable_data_ref_count();
1732
1733 post_init();
1734
1735 // we use the information of entry points to find out if a method is
1736 // static or non static
1737 assert(compiler->is_c2() ||
1738 _method->is_static() == (entry_point() == verified_entry_point()),
1739 " entry points must be same for static methods and vice versa");
1740 }
1741 }
1742
1743 // Print a short set of xml attributes to identify this nmethod. The
1744 // output should be embedded in some other element.
1745 void nmethod::log_identity(xmlStream* log) const {
1746 log->print(" compile_id='%d'", compile_id());
1747 const char* nm_kind = compile_kind();
1748 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1749 log->print(" compiler='%s'", compiler_name());
1750 if (TieredCompilation) {
1751 log->print(" level='%d'", comp_level());
1752 }
1753 }
1754
1755
1756 #define LOG_OFFSET(log, name) \
1757 if (p2i(name##_end()) - p2i(name##_begin())) \
1758 log->print(" " XSTR(name) "_offset='%zd'" , \
1759 p2i(name##_begin()) - p2i(this))
1760
1761
1762 void nmethod::log_new_nmethod() const {
1763 if (LogCompilation && xtty != nullptr) {
1764 ttyLocker ttyl;
1765 xtty->begin_elem("nmethod");
1766 log_identity(xtty);
1767 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1768 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1769
1770 LOG_OFFSET(xtty, relocation);
1771 LOG_OFFSET(xtty, consts);
1772 LOG_OFFSET(xtty, insts);
1773 LOG_OFFSET(xtty, stub);
1774 LOG_OFFSET(xtty, scopes_data);
1775 LOG_OFFSET(xtty, scopes_pcs);
1776 LOG_OFFSET(xtty, dependencies);
1777 LOG_OFFSET(xtty, handler_table);
1778 LOG_OFFSET(xtty, nul_chk_table);
1779 LOG_OFFSET(xtty, oops);
1780 LOG_OFFSET(xtty, metadata);
1781
1782 xtty->method(method());
1783 xtty->stamp();
1784 xtty->end_elem();
1785 }
1786 }
1787
1788
1789 void nmethod::log_relocated_nmethod(nmethod* original) const {
1790 if (LogCompilation && xtty != nullptr) {
1791 ttyLocker ttyl;
1792 xtty->begin_elem("relocated nmethod");
1793 log_identity(xtty);
1794 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1795
1796 const char* original_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(original));
1797 xtty->print(" original_address='" INTPTR_FORMAT "'", p2i(original));
1798 xtty->print(" original_code_heap='%s'", original_code_heap_name);
1799
1800 const char* new_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(this));
1801 xtty->print(" new_address='" INTPTR_FORMAT "'", p2i(this));
1802 xtty->print(" new_code_heap='%s'", new_code_heap_name);
1803
1804 LOG_OFFSET(xtty, relocation);
1805 LOG_OFFSET(xtty, consts);
1806 LOG_OFFSET(xtty, insts);
1807 LOG_OFFSET(xtty, stub);
1808 LOG_OFFSET(xtty, scopes_data);
1809 LOG_OFFSET(xtty, scopes_pcs);
1810 LOG_OFFSET(xtty, dependencies);
1811 LOG_OFFSET(xtty, handler_table);
1812 LOG_OFFSET(xtty, nul_chk_table);
1813 LOG_OFFSET(xtty, oops);
1814 LOG_OFFSET(xtty, metadata);
1815
1816 xtty->method(method());
1817 xtty->stamp();
1818 xtty->end_elem();
1819 }
1820 }
1821
1822 #undef LOG_OFFSET
1823
1824
1825 // Print out more verbose output usually for a newly created nmethod.
1826 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1827 if (st != nullptr) {
1828 ttyLocker ttyl;
1829 if (WizardMode) {
1830 CompileTask::print(st, this, msg, /*short_form:*/ true);
1831 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1832 } else {
1833 CompileTask::print(st, this, msg, /*short_form:*/ false);
1834 }
1835 }
1836 }
1837
1838 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1839 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1840 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1841 print_nmethod(printnmethods);
1842 }
1843 }
1844
1845 void nmethod::print_nmethod(bool printmethod) {
1846 ttyLocker ttyl; // keep the following output all in one block
1847 if (xtty != nullptr) {
1848 xtty->begin_head("print_nmethod");
1849 log_identity(xtty);
1850 xtty->stamp();
1851 xtty->end_head();
1852 }
1853 // Print the header part, then print the requested information.
1854 // This is both handled in decode2().
1855 if (printmethod) {
1856 ResourceMark m;
1857 if (is_compiled_by_c1()) {
1858 tty->cr();
1859 tty->print_cr("============================= C1-compiled nmethod ==============================");
1860 }
1861 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1862 decode2(tty);
1863 #if defined(SUPPORT_DATA_STRUCTS)
1864 if (AbstractDisassembler::show_structs()) {
1865 // Print the oops from the underlying CodeBlob as well.
1866 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1867 print_oops(tty);
1868 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1869 print_metadata(tty);
1870 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1871 print_pcs_on(tty);
1872 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1873 if (oop_maps() != nullptr) {
1874 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1875 oop_maps()->print_on(tty);
1876 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1877 }
1878 }
1879 #endif
1880 } else {
1881 print(); // print the header part only.
1882 }
1883
1884 #if defined(SUPPORT_DATA_STRUCTS)
1885 if (AbstractDisassembler::show_structs()) {
1886 methodHandle mh(Thread::current(), _method);
1887 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1888 print_scopes();
1889 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1890 }
1891 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1892 print_relocations();
1893 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1894 }
1895 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1896 print_dependencies_on(tty);
1897 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1898 }
1899 if (printmethod || PrintExceptionHandlers) {
1900 print_handler_table();
1901 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1902 print_nul_chk_table();
1903 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1904 }
1905
1906 if (printmethod) {
1907 print_recorded_oops();
1908 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1909 print_recorded_metadata();
1910 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1911 }
1912 }
1913 #endif
1914
1915 if (xtty != nullptr) {
1916 xtty->tail("print_nmethod");
1917 }
1918 }
1919
1920
1921 // Promote one word from an assembly-time handle to a live embedded oop.
1922 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1923 if (handle == nullptr ||
1924 // As a special case, IC oops are initialized to 1 or -1.
1925 handle == (jobject) Universe::non_oop_word()) {
1926 *(void**)dest = handle;
1927 } else {
1928 *dest = JNIHandles::resolve_non_null(handle);
1929 }
1930 }
1931
1932
1933 // Have to have the same name because it's called by a template
1934 void nmethod::copy_values(GrowableArray<jobject>* array) {
1935 int length = array->length();
1936 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1937 oop* dest = oops_begin();
1938 for (int index = 0 ; index < length; index++) {
1939 initialize_immediate_oop(&dest[index], array->at(index));
1940 }
1941
1942 // Now we can fix up all the oops in the code. We need to do this
1943 // in the code because the assembler uses jobjects as placeholders.
1944 // The code and relocations have already been initialized by the
1945 // CodeBlob constructor, so it is valid even at this early point to
1946 // iterate over relocations and patch the code.
1947 fix_oop_relocations(/*initialize_immediates=*/ true);
1948 }
1949
1950 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1951 int length = array->length();
1952 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1953 Metadata** dest = metadata_begin();
1954 for (int index = 0 ; index < length; index++) {
1955 dest[index] = array->at(index);
1956 }
1957 }
1958
1959 bool nmethod::fix_oop_relocations(bool initialize_immediates) {
1960 // re-patch all oop-bearing instructions, just in case some oops moved
1961 RelocIterator iter(this);
1962 bool modified_code = false;
1963 while (iter.next()) {
1964 if (iter.type() == relocInfo::oop_type) {
1965 oop_Relocation* reloc = iter.oop_reloc();
1966 if (!reloc->oop_is_immediate()) {
1967 // Refresh the oop-related bits of this instruction.
1968 reloc->set_value(reloc->value());
1969 modified_code = true;
1970 } else if (initialize_immediates) {
1971 oop* dest = reloc->oop_addr();
1972 jobject obj = *reinterpret_cast<jobject*>(dest);
1973 initialize_immediate_oop(dest, obj);
1974 }
1975 } else if (iter.type() == relocInfo::metadata_type) {
1976 metadata_Relocation* reloc = iter.metadata_reloc();
1977 reloc->fix_metadata_relocation();
1978 modified_code |= !reloc->metadata_is_immediate();
1979 }
1980 }
1981 return modified_code;
1982 }
1983
1984 void nmethod::fix_oop_relocations() {
1985 ICacheInvalidationContext icic;
1986 fix_oop_relocations(&icic);
1987 }
1988
1989 void nmethod::fix_oop_relocations(ICacheInvalidationContext* icic) {
1990 assert(icic != nullptr, "must provide context to track if code was modified");
1991 bool modified_code = fix_oop_relocations(/*initialize_immediates=*/ false);
1992 if (modified_code) {
1993 icic->set_has_modified_code();
1994 }
1995 }
1996
1997 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1998 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1999 intptr_t cbaddr = (intptr_t) nm;
2000 intptr_t offset = ((intptr_t) pc) - cbaddr;
2001
2002 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
2003 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
2004 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
2005 } else if (!nop->patch(oopmap_slot, offset)) {
2006 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
2007 }
2008 }
2009
2010 void nmethod::finalize_relocations() {
2011 NoSafepointVerifier nsv;
2012
2013 GrowableArray<NativeMovConstReg*> virtual_call_data;
2014
2015 // Make sure that post call nops fill in nmethod offsets eagerly so
2016 // we don't have to race with deoptimization
2017 RelocIterator iter(this);
2018 while (iter.next()) {
2019 if (iter.type() == relocInfo::virtual_call_type) {
2020 virtual_call_Relocation* r = iter.virtual_call_reloc();
2021 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
2022 virtual_call_data.append(value);
2023 } else if (iter.type() == relocInfo::post_call_nop_type) {
2024 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
2025 address pc = reloc->addr();
2026 install_post_call_nop_displacement(this, pc);
2027 }
2028 }
2029
2030 if (virtual_call_data.length() > 0) {
2031 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
2032 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
2033 CompiledICData* next_data = _compiled_ic_data;
2034
2035 for (NativeMovConstReg* value : virtual_call_data) {
2036 value->set_data((intptr_t)next_data);
2037 next_data++;
2038 }
2039 }
2040 }
2041
2042 void nmethod::make_deoptimized() {
2043 if (!Continuations::enabled()) {
2044 // Don't deopt this again.
2045 set_deoptimized_done();
2046 return;
2047 }
2048
2049 assert(method() == nullptr || can_be_deoptimized(), "");
2050
2051 CompiledICLocker ml(this);
2052 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2053
2054 // If post call nops have been already patched, we can just bail-out.
2055 if (has_been_deoptimized()) {
2056 return;
2057 }
2058
2059 ResourceMark rm;
2060 RelocIterator iter(this, oops_reloc_begin());
2061
2062 // Assume there will be some calls to make deoptimized.
2063 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2064
2065 while (iter.next()) {
2066
2067 switch (iter.type()) {
2068 case relocInfo::virtual_call_type: {
2069 CompiledIC *ic = CompiledIC_at(&iter);
2070 address pc = ic->end_of_call();
2071 NativePostCallNop* nop = nativePostCallNop_at(pc);
2072 if (nop != nullptr) {
2073 nop->make_deopt();
2074 }
2075 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2076 break;
2077 }
2078 case relocInfo::static_call_type:
2079 case relocInfo::opt_virtual_call_type: {
2080 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2081 address pc = csc->end_of_call();
2082 NativePostCallNop* nop = nativePostCallNop_at(pc);
2083 //tty->print_cr(" - static pc %p", pc);
2084 if (nop != nullptr) {
2085 nop->make_deopt();
2086 }
2087 // We can't assert here, there are some calls to stubs / runtime
2088 // that have reloc data and doesn't have a post call NOP.
2089 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2090 break;
2091 }
2092 default:
2093 break;
2094 }
2095 }
2096 // Don't deopt this again.
2097 set_deoptimized_done();
2098 }
2099
2100 void nmethod::verify_clean_inline_caches() {
2101 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2102
2103 ResourceMark rm;
2104 RelocIterator iter(this, oops_reloc_begin());
2105 while(iter.next()) {
2106 switch(iter.type()) {
2107 case relocInfo::virtual_call_type: {
2108 CompiledIC *ic = CompiledIC_at(&iter);
2109 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2110 assert(cb != nullptr, "destination not in CodeBlob?");
2111 nmethod* nm = cb->as_nmethod_or_null();
2112 if (nm != nullptr) {
2113 // Verify that inline caches pointing to bad nmethods are clean
2114 if (!nm->is_in_use() || nm->is_unloading()) {
2115 assert(ic->is_clean(), "IC should be clean");
2116 }
2117 }
2118 break;
2119 }
2120 case relocInfo::static_call_type:
2121 case relocInfo::opt_virtual_call_type: {
2122 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2123 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2124 assert(cb != nullptr, "destination not in CodeBlob?");
2125 nmethod* nm = cb->as_nmethod_or_null();
2126 if (nm != nullptr) {
2127 // Verify that inline caches pointing to bad nmethods are clean
2128 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2129 assert(cdc->is_clean(), "IC should be clean");
2130 }
2131 }
2132 break;
2133 }
2134 default:
2135 break;
2136 }
2137 }
2138 }
2139
2140 void nmethod::mark_as_maybe_on_stack() {
2141 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2142 AtomicAccess::store(&_gc_epoch, CodeCache::gc_epoch());
2143 }
2144
2145 bool nmethod::is_maybe_on_stack() {
2146 // If the condition below is true, it means that the nmethod was found to
2147 // be alive the previous completed marking cycle.
2148 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2149 }
2150
2151 void nmethod::inc_decompile_count() {
2152 if (!is_compiled_by_c2()) {
2153 return;
2154 }
2155 // Could be gated by ProfileTraps, but do not bother...
2156 Method* m = method();
2157 if (m == nullptr) return;
2158 MethodData* mdo = m->method_data();
2159 if (mdo == nullptr) return;
2160 // There is a benign race here. See comments in methodData.hpp.
2161 mdo->inc_decompile_count();
2162 }
2163
2164 bool nmethod::try_transition(signed char new_state_int) {
2165 signed char new_state = new_state_int;
2166 assert_lock_strong(NMethodState_lock);
2167 signed char old_state = _state;
2168 if (old_state >= new_state) {
2169 // Ensure monotonicity of transitions.
2170 return false;
2171 }
2172 AtomicAccess::store(&_state, new_state);
2173 return true;
2174 }
2175
2176 void nmethod::invalidate_osr_method() {
2177 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2178 // Remove from list of active nmethods
2179 if (method() != nullptr) {
2180 method()->method_holder()->remove_osr_nmethod(this);
2181 }
2182 }
2183
2184 void nmethod::log_state_change(InvalidationReason invalidation_reason) const {
2185 if (LogCompilation) {
2186 if (xtty != nullptr) {
2187 ttyLocker ttyl; // keep the following output all in one block
2188 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2189 os::current_thread_id(), invalidation_reason_to_string(invalidation_reason));
2190 log_identity(xtty);
2191 xtty->stamp();
2192 xtty->end_elem();
2193 }
2194 }
2195
2196 ResourceMark rm;
2197 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2198 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2199
2200 CompileTask::print_ul(this, ss.freeze());
2201 if (PrintCompilation) {
2202 print_on_with_msg(tty, ss.freeze());
2203 }
2204 }
2205
2206 void nmethod::unlink_from_method() {
2207 if (method() != nullptr) {
2208 method()->unlink_code(this);
2209 }
2210 }
2211
2212 // Invalidate code
2213 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason) {
2214 // This can be called while the system is already at a safepoint which is ok
2215 NoSafepointVerifier nsv;
2216
2217 if (is_unloading()) {
2218 // If the nmethod is unloading, then it is already not entrant through
2219 // the nmethod entry barriers. No need to do anything; GC will unload it.
2220 return false;
2221 }
2222
2223 if (AtomicAccess::load(&_state) == not_entrant) {
2224 // Avoid taking the lock if already in required state.
2225 // This is safe from races because the state is an end-state,
2226 // which the nmethod cannot back out of once entered.
2227 // No need for fencing either.
2228 return false;
2229 }
2230
2231 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2232
2233 {
2234 // Enter critical section. Does not block for safepoint.
2235 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2236
2237 if (AtomicAccess::load(&_state) == not_entrant) {
2238 // another thread already performed this transition so nothing
2239 // to do, but return false to indicate this.
2240 return false;
2241 }
2242
2243 if (is_osr_method()) {
2244 // This logic is equivalent to the logic below for patching the
2245 // verified entry point of regular methods.
2246 // this effectively makes the osr nmethod not entrant
2247 invalidate_osr_method();
2248 } else {
2249 // The caller can be calling the method statically or through an inline
2250 // cache call.
2251 BarrierSet::barrier_set()->barrier_set_nmethod()->make_not_entrant(this);
2252 }
2253
2254 if (update_recompile_counts()) {
2255 // Mark the method as decompiled.
2256 inc_decompile_count();
2257 }
2258
2259 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2260 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2261 // If nmethod entry barriers are not supported, we won't mark
2262 // nmethods as on-stack when they become on-stack. So we
2263 // degrade to a less accurate flushing strategy, for now.
2264 mark_as_maybe_on_stack();
2265 }
2266
2267 // Change state
2268 bool success = try_transition(not_entrant);
2269 assert(success, "Transition can't fail");
2270
2271 // Log the transition once
2272 log_state_change(invalidation_reason);
2273
2274 // Remove nmethod from method.
2275 unlink_from_method();
2276
2277 } // leave critical region under NMethodState_lock
2278
2279 #ifdef ASSERT
2280 if (is_osr_method() && method() != nullptr) {
2281 // Make sure osr nmethod is invalidated, i.e. not on the list
2282 bool found = method()->method_holder()->remove_osr_nmethod(this);
2283 assert(!found, "osr nmethod should have been invalidated");
2284 }
2285 #endif
2286
2287 return true;
2288 }
2289
2290 // For concurrent GCs, there must be a handshake between unlink and flush
2291 void nmethod::unlink() {
2292 if (is_unlinked()) {
2293 // Already unlinked.
2294 return;
2295 }
2296
2297 flush_dependencies();
2298
2299 // unlink_from_method will take the NMethodState_lock.
2300 // In this case we don't strictly need it when unlinking nmethods from
2301 // the Method, because it is only concurrently unlinked by
2302 // the entry barrier, which acquires the per nmethod lock.
2303 unlink_from_method();
2304
2305 if (is_osr_method()) {
2306 invalidate_osr_method();
2307 }
2308
2309 // Post before flushing as jmethodID is being used
2310 post_compiled_method_unload();
2311
2312 // Register for flushing when it is safe. For concurrent class unloading,
2313 // that would be after the unloading handshake, and for STW class unloading
2314 // that would be when getting back to the VM thread.
2315 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2316 }
2317
2318 void nmethod::purge(bool unregister_nmethod) {
2319
2320 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2321
2322 // completely deallocate this method
2323 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2324
2325 LogTarget(Debug, codecache) lt;
2326 if (lt.is_enabled()) {
2327 ResourceMark rm;
2328 LogStream ls(lt);
2329 const char* method_name = method()->name()->as_C_string();
2330 const size_t codecache_capacity = CodeCache::capacity()/1024;
2331 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2332 ls.print("Flushing nmethod %6d/" INTPTR_FORMAT ", level=%d, osr=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2333 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2334 _compile_id, p2i(this), _comp_level, is_osr_method(), is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2335 codecache_capacity, codecache_free_space, method_name, compiler_name());
2336 }
2337
2338 // We need to deallocate any ExceptionCache data.
2339 // Note that we do not need to grab the nmethod lock for this, it
2340 // better be thread safe if we're disposing of it!
2341 ExceptionCache* ec = exception_cache();
2342 while(ec != nullptr) {
2343 ExceptionCache* next = ec->next();
2344 delete ec;
2345 ec = next;
2346 }
2347 if (_pc_desc_container != nullptr) {
2348 delete _pc_desc_container;
2349 }
2350 delete[] _compiled_ic_data;
2351
2352 if (_immutable_data != blob_end()) {
2353 // Free memory if this was the last nmethod referencing immutable data
2354 if (dec_immutable_data_ref_count() == 0) {
2355 os::free(_immutable_data);
2356 }
2357
2358 _immutable_data = blob_end(); // Valid not null address
2359 }
2360
2361 if (unregister_nmethod) {
2362 Universe::heap()->unregister_nmethod(this);
2363 }
2364
2365 #ifdef COMPILER2
2366 HotCodeCollector::unregister_nmethod(this);
2367 #endif // COMPILER2
2368
2369 CodeCache::unregister_old_nmethod(this);
2370
2371 CodeBlob::purge();
2372 }
2373
2374 oop nmethod::oop_at(int index) const {
2375 if (index == 0) {
2376 return nullptr;
2377 }
2378
2379 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2380 return bs_nm->oop_load_no_keepalive(this, index);
2381 }
2382
2383 oop nmethod::oop_at_phantom(int index) const {
2384 if (index == 0) {
2385 return nullptr;
2386 }
2387
2388 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2389 return bs_nm->oop_load_phantom(this, index);
2390 }
2391
2392 //
2393 // Notify all classes this nmethod is dependent on that it is no
2394 // longer dependent.
2395
2396 void nmethod::flush_dependencies() {
2397 if (!has_flushed_dependencies()) {
2398 set_has_flushed_dependencies(true);
2399 for (Dependencies::DepStream deps(this); deps.next(); ) {
2400 if (deps.type() == Dependencies::call_site_target_value) {
2401 // CallSite dependencies are managed on per-CallSite instance basis.
2402 oop call_site = deps.argument_oop(0);
2403 MethodHandles::clean_dependency_context(call_site);
2404 } else {
2405 InstanceKlass* ik = deps.context_type();
2406 if (ik == nullptr) {
2407 continue; // ignore things like evol_method
2408 }
2409 // During GC liveness of dependee determines class that needs to be updated.
2410 // The GC may clean dependency contexts concurrently and in parallel.
2411 ik->clean_dependency_context();
2412 }
2413 }
2414 }
2415 }
2416
2417 void nmethod::post_compiled_method(CompileTask* task) {
2418 task->mark_success();
2419 task->set_nm_content_size(content_size());
2420 task->set_nm_insts_size(insts_size());
2421 task->set_nm_total_size(total_size());
2422
2423 // JVMTI -- compiled method notification (must be done outside lock)
2424 post_compiled_method_load_event();
2425
2426 if (CompilationLog::log() != nullptr) {
2427 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2428 }
2429
2430 const DirectiveSet* directive = task->directive();
2431 maybe_print_nmethod(directive);
2432 }
2433
2434 #if INCLUDE_CDS
2435 static GrowableArrayCHeap<nmethod*, mtClassShared>* _delayed_compiled_method_load_events = nullptr;
2436
2437 void nmethod::add_delayed_compiled_method_load_event(nmethod* nm) {
2438 precond(CDSConfig::is_using_aot_linked_classes());
2439 precond(!ServiceThread::has_started());
2440
2441 // We are still in single threaded stage of VM bootstrap. No need to lock.
2442 if (_delayed_compiled_method_load_events == nullptr) {
2443 _delayed_compiled_method_load_events = new GrowableArrayCHeap<nmethod*, mtClassShared>();
2444 }
2445 _delayed_compiled_method_load_events->append(nm);
2446 }
2447
2448 void nmethod::post_delayed_compiled_method_load_events() {
2449 precond(ServiceThread::has_started());
2450 if (_delayed_compiled_method_load_events != nullptr) {
2451 for (int i = 0; i < _delayed_compiled_method_load_events->length(); i++) {
2452 nmethod* nm = _delayed_compiled_method_load_events->at(i);
2453 nm->post_compiled_method_load_event();
2454 }
2455 delete _delayed_compiled_method_load_events;
2456 _delayed_compiled_method_load_events = nullptr;
2457 }
2458 }
2459 #endif
2460
2461 // ------------------------------------------------------------------
2462 // post_compiled_method_load_event
2463 // new method for install_code() path
2464 // Transfer information from compilation to jvmti
2465 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2466 #if INCLUDE_CDS
2467 if (!ServiceThread::has_started()) {
2468 // With AOT-linked classes, we could compile wrappers for native methods before the
2469 // ServiceThread has been started, so we must delay the events to be posted later.
2470 assert(state == nullptr, "must be");
2471 add_delayed_compiled_method_load_event(this);
2472 return;
2473 }
2474 #endif
2475
2476 // This is a bad time for a safepoint. We don't want
2477 // this nmethod to get unloaded while we're queueing the event.
2478 NoSafepointVerifier nsv;
2479
2480 Method* m = method();
2481 HOTSPOT_COMPILED_METHOD_LOAD(
2482 (char *) m->klass_name()->bytes(),
2483 m->klass_name()->utf8_length(),
2484 (char *) m->name()->bytes(),
2485 m->name()->utf8_length(),
2486 (char *) m->signature()->bytes(),
2487 m->signature()->utf8_length(),
2488 insts_begin(), insts_size());
2489
2490
2491 if (JvmtiExport::should_post_compiled_method_load()) {
2492 // Only post unload events if load events are found.
2493 set_load_reported();
2494 // If a JavaThread hasn't been passed in, let the Service thread
2495 // (which is a real Java thread) post the event
2496 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2497 if (state == nullptr) {
2498 // Execute any barrier code for this nmethod as if it's called, since
2499 // keeping it alive looks like stack walking.
2500 run_nmethod_entry_barrier();
2501 ServiceThread::enqueue_deferred_event(&event);
2502 } else {
2503 // This enters the nmethod barrier outside in the caller.
2504 state->enqueue_event(&event);
2505 }
2506 }
2507 }
2508
2509 void nmethod::post_compiled_method_unload() {
2510 assert(_method != nullptr, "just checking");
2511 DTRACE_METHOD_UNLOAD_PROBE(method());
2512
2513 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2514 // post the event. The Method* will not be valid when this is freed.
2515
2516 // Don't bother posting the unload if the load event wasn't posted.
2517 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2518 JvmtiDeferredEvent event =
2519 JvmtiDeferredEvent::compiled_method_unload_event(
2520 method()->jmethod_id(), insts_begin());
2521 ServiceThread::enqueue_deferred_event(&event);
2522 }
2523 }
2524
2525 // Iterate over metadata calling this function. Used by RedefineClasses
2526 void nmethod::metadata_do(MetadataClosure* f) {
2527 {
2528 // Visit all immediate references that are embedded in the instruction stream.
2529 RelocIterator iter(this, oops_reloc_begin());
2530 while (iter.next()) {
2531 if (iter.type() == relocInfo::metadata_type) {
2532 metadata_Relocation* r = iter.metadata_reloc();
2533 // In this metadata, we must only follow those metadatas directly embedded in
2534 // the code. Other metadatas (oop_index>0) are seen as part of
2535 // the metadata section below.
2536 assert(1 == (r->metadata_is_immediate()) +
2537 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2538 "metadata must be found in exactly one place");
2539 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2540 Metadata* md = r->metadata_value();
2541 if (md != _method) f->do_metadata(md);
2542 }
2543 } else if (iter.type() == relocInfo::virtual_call_type) {
2544 // Check compiledIC holders associated with this nmethod
2545 ResourceMark rm;
2546 CompiledIC *ic = CompiledIC_at(&iter);
2547 ic->metadata_do(f);
2548 }
2549 }
2550 }
2551
2552 // Visit the metadata section
2553 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2554 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2555 Metadata* md = *p;
2556 f->do_metadata(md);
2557 }
2558
2559 // Visit metadata not embedded in the other places.
2560 if (_method != nullptr) f->do_metadata(_method);
2561 }
2562
2563 // Heuristic for nuking nmethods even though their oops are live.
2564 // Main purpose is to reduce code cache pressure and get rid of
2565 // nmethods that don't seem to be all that relevant any longer.
2566 bool nmethod::is_cold() {
2567 if (!MethodFlushing || is_not_installed()) {
2568 // No heuristic unloading at all
2569 return false;
2570 }
2571
2572 if (!is_maybe_on_stack() && is_not_entrant()) {
2573 // Not entrant nmethods that are not on any stack can just
2574 // be removed
2575 return true;
2576 }
2577
2578 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2579 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2580 // On platforms that don't support nmethod entry barriers, we can't
2581 // trust the temporal aspect of the gc epochs. So we can't detect
2582 // cold nmethods on such platforms.
2583 return false;
2584 }
2585
2586 if (!UseCodeCacheFlushing) {
2587 // Bail out if we don't heuristically remove nmethods
2588 return false;
2589 }
2590
2591 // Other code can be phased out more gradually after N GCs
2592 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2593 }
2594
2595 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2596 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2597 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2598 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2599 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2600
2601 class IsUnloadingState: public AllStatic {
2602 static const uint8_t _is_unloading_mask = 1;
2603 static const uint8_t _is_unloading_shift = 0;
2604 static const uint8_t _unloading_cycle_mask = 6;
2605 static const uint8_t _unloading_cycle_shift = 1;
2606
2607 static uint8_t set_is_unloading(uint8_t state, bool value) {
2608 state &= (uint8_t)~_is_unloading_mask;
2609 if (value) {
2610 state |= 1 << _is_unloading_shift;
2611 }
2612 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2613 return state;
2614 }
2615
2616 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2617 state &= (uint8_t)~_unloading_cycle_mask;
2618 state |= (uint8_t)(value << _unloading_cycle_shift);
2619 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2620 return state;
2621 }
2622
2623 public:
2624 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2625 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2626
2627 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2628 uint8_t state = 0;
2629 state = set_is_unloading(state, is_unloading);
2630 state = set_unloading_cycle(state, unloading_cycle);
2631 return state;
2632 }
2633 };
2634
2635 bool nmethod::is_unloading() {
2636 uint8_t state = AtomicAccess::load(&_is_unloading_state);
2637 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2638 if (state_is_unloading) {
2639 return true;
2640 }
2641 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2642 uint8_t current_cycle = CodeCache::unloading_cycle();
2643 if (state_unloading_cycle == current_cycle) {
2644 return false;
2645 }
2646
2647 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2648 // should be unloaded. This can be either because there is a dead oop,
2649 // or because is_cold() heuristically determines it is time to unload.
2650 state_unloading_cycle = current_cycle;
2651 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2652 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2653
2654 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
2655
2656 // Note that if an nmethod has dead oops, everyone will agree that the
2657 // nmethod is_unloading. However, the is_cold heuristics can yield
2658 // different outcomes, so we guard the computed result with a CAS
2659 // to ensure all threads have a shared view of whether an nmethod
2660 // is_unloading or not.
2661 uint8_t found_state = AtomicAccess::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2662
2663 if (found_state == state) {
2664 // First to change state, we win
2665 return state_is_unloading;
2666 } else {
2667 // State already set, so use it
2668 return IsUnloadingState::is_unloading(found_state);
2669 }
2670 }
2671
2672 void nmethod::clear_unloading_state() {
2673 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2674 AtomicAccess::store(&_is_unloading_state, state);
2675 }
2676
2677
2678 // This is called at the end of the strong tracing/marking phase of a
2679 // GC to unload an nmethod if it contains otherwise unreachable
2680 // oops or is heuristically found to be not important.
2681 void nmethod::do_unloading(bool unloading_occurred) {
2682 // Make sure the oop's ready to receive visitors
2683 if (is_unloading()) {
2684 unlink();
2685 } else {
2686 unload_nmethod_caches(unloading_occurred);
2687 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2688 if (bs_nm != nullptr) {
2689 bs_nm->disarm(this);
2690 }
2691 }
2692 }
2693
2694 void nmethod::oops_do(OopClosure* f) {
2695 // Prevent extra code cache walk for platforms that don't have immediate oops.
2696 if (relocInfo::mustIterateImmediateOopsInCode()) {
2697 RelocIterator iter(this, oops_reloc_begin());
2698
2699 while (iter.next()) {
2700 if (iter.type() == relocInfo::oop_type ) {
2701 oop_Relocation* r = iter.oop_reloc();
2702 // In this loop, we must only follow those oops directly embedded in
2703 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2704 assert(1 == (r->oop_is_immediate()) +
2705 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2706 "oop must be found in exactly one place");
2707 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2708 f->do_oop(r->oop_addr());
2709 }
2710 }
2711 }
2712 }
2713
2714 // Scopes
2715 // This includes oop constants not inlined in the code stream.
2716 for (oop* p = oops_begin(); p < oops_end(); p++) {
2717 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2718 f->do_oop(p);
2719 }
2720 }
2721
2722 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2723 // Process oops in the nmethod
2724 oops_do(cl);
2725
2726 // CodeCache unloading support
2727 mark_as_maybe_on_stack();
2728
2729 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2730 bs_nm->disarm(this);
2731
2732 // There's an assumption made that this function is not used by GCs that
2733 // relocate objects, and therefore we don't call fix_oop_relocations.
2734 }
2735
2736 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2737
2738 void nmethod::oops_do_log_change(const char* state) {
2739 LogTarget(Trace, gc, nmethod) lt;
2740 if (lt.is_enabled()) {
2741 LogStream ls(lt);
2742 CompileTask::print(&ls, this, state, true /* short_form */);
2743 }
2744 }
2745
2746 bool nmethod::oops_do_try_claim() {
2747 if (oops_do_try_claim_weak_request()) {
2748 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2749 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2750 return true;
2751 }
2752 return false;
2753 }
2754
2755 bool nmethod::oops_do_try_claim_weak_request() {
2756 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2757
2758 if ((_oops_do_mark_link == nullptr) &&
2759 (AtomicAccess::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2760 oops_do_log_change("oops_do, mark weak request");
2761 return true;
2762 }
2763 return false;
2764 }
2765
2766 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2767 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2768 }
2769
2770 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2771 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2772
2773 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));
2774 if (old_next == nullptr) {
2775 oops_do_log_change("oops_do, mark strong done");
2776 }
2777 return old_next;
2778 }
2779
2780 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2781 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2782 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2783
2784 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2785 if (old_next == next) {
2786 oops_do_log_change("oops_do, mark strong request");
2787 }
2788 return old_next;
2789 }
2790
2791 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2792 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2793 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2794
2795 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2796 if (old_next == next) {
2797 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2798 return true;
2799 }
2800 return false;
2801 }
2802
2803 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2804 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2805
2806 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2807 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2808 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2809
2810 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2811 // Self-loop if needed.
2812 if (old_head == nullptr) {
2813 old_head = this;
2814 }
2815 // Try to install end of list and weak done tag.
2816 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)) {
2817 oops_do_log_change("oops_do, mark weak done");
2818 return nullptr;
2819 } else {
2820 return old_head;
2821 }
2822 }
2823
2824 void nmethod::oops_do_add_to_list_as_strong_done() {
2825 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2826
2827 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2828 // Self-loop if needed.
2829 if (old_head == nullptr) {
2830 old_head = this;
2831 }
2832 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2833 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2834
2835 oops_do_set_strong_done(old_head);
2836 }
2837
2838 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2839 if (!oops_do_try_claim_weak_request()) {
2840 // Failed to claim for weak processing.
2841 oops_do_log_change("oops_do, mark weak request fail");
2842 return;
2843 }
2844
2845 p->do_regular_processing(this);
2846
2847 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2848 if (old_head == nullptr) {
2849 return;
2850 }
2851 oops_do_log_change("oops_do, mark weak done fail");
2852 // Adding to global list failed, another thread added a strong request.
2853 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2854 "must be but is %u", extract_state(_oops_do_mark_link));
2855
2856 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2857
2858 oops_do_set_strong_done(old_head);
2859 // Do missing strong processing.
2860 p->do_remaining_strong_processing(this);
2861 }
2862
2863 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2864 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2865 if (next_raw == nullptr) {
2866 p->do_regular_processing(this);
2867 oops_do_add_to_list_as_strong_done();
2868 return;
2869 }
2870 // Claim failed. Figure out why and handle it.
2871 if (oops_do_has_weak_request(next_raw)) {
2872 oops_do_mark_link* old = next_raw;
2873 // Claim failed because being weak processed (state == "weak request").
2874 // Try to request deferred strong processing.
2875 next_raw = oops_do_try_add_strong_request(old);
2876 if (next_raw == old) {
2877 // Successfully requested deferred strong processing.
2878 return;
2879 }
2880 // Failed because of a concurrent transition. No longer in "weak request" state.
2881 }
2882 if (oops_do_has_any_strong_state(next_raw)) {
2883 // Already claimed for strong processing or requested for such.
2884 return;
2885 }
2886 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2887 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2888 p->do_remaining_strong_processing(this);
2889 return;
2890 }
2891 // Claim failed, some other thread got it.
2892 }
2893
2894 void nmethod::oops_do_marking_prologue() {
2895 assert_at_safepoint();
2896
2897 log_trace(gc, nmethod)("oops_do_marking_prologue");
2898 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2899 }
2900
2901 void nmethod::oops_do_marking_epilogue() {
2902 assert_at_safepoint();
2903
2904 nmethod* next = _oops_do_mark_nmethods;
2905 _oops_do_mark_nmethods = nullptr;
2906 if (next != nullptr) {
2907 nmethod* cur;
2908 do {
2909 cur = next;
2910 next = extract_nmethod(cur->_oops_do_mark_link);
2911 cur->_oops_do_mark_link = nullptr;
2912 DEBUG_ONLY(cur->verify_oop_relocations());
2913
2914 LogTarget(Trace, gc, nmethod) lt;
2915 if (lt.is_enabled()) {
2916 LogStream ls(lt);
2917 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2918 }
2919 // End if self-loop has been detected.
2920 } while (cur != next);
2921 }
2922 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2923 }
2924
2925 inline bool includes(void* p, void* from, void* to) {
2926 return from <= p && p < to;
2927 }
2928
2929
2930 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2931 assert(count >= 2, "must be sentinel values, at least");
2932
2933 #ifdef ASSERT
2934 // must be sorted and unique; we do a binary search in find_pc_desc()
2935 int prev_offset = pcs[0].pc_offset();
2936 assert(prev_offset == PcDesc::lower_offset_limit,
2937 "must start with a sentinel");
2938 for (int i = 1; i < count; i++) {
2939 int this_offset = pcs[i].pc_offset();
2940 assert(this_offset > prev_offset, "offsets must be sorted");
2941 prev_offset = this_offset;
2942 }
2943 assert(prev_offset == PcDesc::upper_offset_limit,
2944 "must end with a sentinel");
2945 #endif //ASSERT
2946
2947 int size = count * sizeof(PcDesc);
2948 assert(scopes_pcs_size() >= size, "oob");
2949 memcpy(scopes_pcs_begin(), pcs, size);
2950
2951 // Adjust the final sentinel downward.
2952 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2953 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2954 last_pc->set_pc_offset(content_size() + 1);
2955 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2956 // Fill any rounding gaps with copies of the last record.
2957 last_pc[1] = last_pc[0];
2958 }
2959 // The following assert could fail if sizeof(PcDesc) is not
2960 // an integral multiple of oopSize (the rounding term).
2961 // If it fails, change the logic to always allocate a multiple
2962 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2963 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2964 }
2965
2966 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2967 assert(scopes_data_size() >= size, "oob");
2968 memcpy(scopes_data_begin(), buffer, size);
2969 }
2970
2971 #ifdef ASSERT
2972 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2973 PcDesc* res = nullptr;
2974 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2975 "must start with a sentinel");
2976 // lower + 1 to exclude initial sentinel
2977 for (PcDesc* p = lower + 1; p < upper; p++) {
2978 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2979 if (match_desc(p, pc_offset, approximate)) {
2980 if (res == nullptr) {
2981 res = p;
2982 } else {
2983 res = (PcDesc*) badAddress;
2984 }
2985 }
2986 }
2987 return res;
2988 }
2989 #endif
2990
2991
2992 #ifndef PRODUCT
2993 // Version of method to collect statistic
2994 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2995 PcDesc* lower, PcDesc* upper) {
2996 ++pc_nmethod_stats.pc_desc_queries;
2997 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2998
2999 PcDesc* desc = _pc_desc_cache.last_pc_desc();
3000 assert(desc != nullptr, "PcDesc cache should be initialized already");
3001 if (desc->pc_offset() == (pc - code_begin)) {
3002 // Cached value matched
3003 ++pc_nmethod_stats.pc_desc_tests;
3004 ++pc_nmethod_stats.pc_desc_repeats;
3005 return desc;
3006 }
3007 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
3008 }
3009 #endif
3010
3011 // Finds a PcDesc with real-pc equal to "pc"
3012 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
3013 PcDesc* lower_incl, PcDesc* upper_incl) {
3014 if ((pc < code_begin) ||
3015 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
3016 return nullptr; // PC is wildly out of range
3017 }
3018 int pc_offset = (int) (pc - code_begin);
3019
3020 // Check the PcDesc cache if it contains the desired PcDesc
3021 // (This as an almost 100% hit rate.)
3022 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
3023 if (res != nullptr) {
3024 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
3025 return res;
3026 }
3027
3028 // Fallback algorithm: quasi-linear search for the PcDesc
3029 // Find the last pc_offset less than the given offset.
3030 // The successor must be the required match, if there is a match at all.
3031 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
3032 PcDesc* lower = lower_incl; // this is initial sentinel
3033 PcDesc* upper = upper_incl - 1; // exclude final sentinel
3034 if (lower >= upper) return nullptr; // no PcDescs at all
3035
3036 #define assert_LU_OK \
3037 /* invariant on lower..upper during the following search: */ \
3038 assert(lower->pc_offset() < pc_offset, "sanity"); \
3039 assert(upper->pc_offset() >= pc_offset, "sanity")
3040 assert_LU_OK;
3041
3042 // Use the last successful return as a split point.
3043 PcDesc* mid = _pc_desc_cache.last_pc_desc();
3044 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3045 if (mid->pc_offset() < pc_offset) {
3046 lower = mid;
3047 } else {
3048 upper = mid;
3049 }
3050
3051 // Take giant steps at first (4096, then 256, then 16, then 1)
3052 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3053 const int RADIX = (1 << LOG2_RADIX);
3054 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3055 while ((mid = lower + step) < upper) {
3056 assert_LU_OK;
3057 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3058 if (mid->pc_offset() < pc_offset) {
3059 lower = mid;
3060 } else {
3061 upper = mid;
3062 break;
3063 }
3064 }
3065 assert_LU_OK;
3066 }
3067
3068 // Sneak up on the value with a linear search of length ~16.
3069 while (true) {
3070 assert_LU_OK;
3071 mid = lower + 1;
3072 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3073 if (mid->pc_offset() < pc_offset) {
3074 lower = mid;
3075 } else {
3076 upper = mid;
3077 break;
3078 }
3079 }
3080 #undef assert_LU_OK
3081
3082 if (match_desc(upper, pc_offset, approximate)) {
3083 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3084 if (!Thread::current_in_asgct()) {
3085 // we don't want to modify the cache if we're in ASGCT
3086 // which is typically called in a signal handler
3087 _pc_desc_cache.add_pc_desc(upper);
3088 }
3089 return upper;
3090 } else {
3091 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3092 return nullptr;
3093 }
3094 }
3095
3096 bool nmethod::check_dependency_on(DepChange& changes) {
3097 // What has happened:
3098 // 1) a new class dependee has been added
3099 // 2) dependee and all its super classes have been marked
3100 bool found_check = false; // set true if we are upset
3101 for (Dependencies::DepStream deps(this); deps.next(); ) {
3102 // Evaluate only relevant dependencies.
3103 if (deps.spot_check_dependency_at(changes) != nullptr) {
3104 found_check = true;
3105 NOT_DEBUG(break);
3106 }
3107 }
3108 return found_check;
3109 }
3110
3111 // Called from mark_for_deoptimization, when dependee is invalidated.
3112 bool nmethod::is_dependent_on_method(Method* dependee) {
3113 for (Dependencies::DepStream deps(this); deps.next(); ) {
3114 if (Dependencies::has_method_dep(deps.type())) {
3115 Method* method = deps.method_argument(0);
3116 if (method == dependee) return true;
3117 }
3118 }
3119 return false;
3120 }
3121
3122 void nmethod_init() {
3123 // make sure you didn't forget to adjust the filler fields
3124 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3125 }
3126
3127 // -----------------------------------------------------------------------------
3128 // Verification
3129
3130 class VerifyOopsClosure: public OopClosure {
3131 nmethod* _nm;
3132 bool _ok;
3133 public:
3134 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3135 bool ok() { return _ok; }
3136 virtual void do_oop(oop* p) {
3137 if (oopDesc::is_oop_or_null(*p)) return;
3138 // Print diagnostic information before calling print_nmethod().
3139 // Assertions therein might prevent call from returning.
3140 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3141 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3142 if (_ok) {
3143 _nm->print_nmethod(true);
3144 _ok = false;
3145 }
3146 }
3147 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3148 };
3149
3150 class VerifyMetadataClosure: public MetadataClosure {
3151 public:
3152 void do_metadata(Metadata* md) {
3153 if (md->is_method()) {
3154 Method* method = (Method*)md;
3155 assert(!method->is_old(), "Should not be installing old methods");
3156 }
3157 }
3158 };
3159
3160
3161 void nmethod::verify() {
3162 if (is_not_entrant())
3163 return;
3164
3165 // assert(oopDesc::is_oop(method()), "must be valid");
3166
3167 ResourceMark rm;
3168
3169 if (!CodeCache::contains(this)) {
3170 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3171 }
3172
3173 if(is_native_method() )
3174 return;
3175
3176 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3177 if (nm != this) {
3178 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3179 }
3180
3181 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3182 if (! p->verify(this)) {
3183 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3184 }
3185 }
3186
3187 VerifyOopsClosure voc(this);
3188 oops_do(&voc);
3189 assert(voc.ok(), "embedded oops must be OK");
3190 Universe::heap()->verify_nmethod(this);
3191
3192 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3193 nm->method()->external_name(), p2i(_oops_do_mark_link));
3194 verify_scopes();
3195
3196 CompiledICLocker nm_verify(this);
3197 VerifyMetadataClosure vmc;
3198 metadata_do(&vmc);
3199 }
3200
3201
3202 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3203
3204 // Verify IC only when nmethod installation is finished.
3205 if (!is_not_installed()) {
3206 if (CompiledICLocker::is_safe(this)) {
3207 if (is_inline_cache) {
3208 CompiledIC_at(this, call_site);
3209 } else {
3210 CompiledDirectCall::at(call_site);
3211 }
3212 } else {
3213 CompiledICLocker ml_verify(this);
3214 if (is_inline_cache) {
3215 CompiledIC_at(this, call_site);
3216 } else {
3217 CompiledDirectCall::at(call_site);
3218 }
3219 }
3220 }
3221
3222 HandleMark hm(Thread::current());
3223
3224 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3225 assert(pd != nullptr, "PcDesc must exist");
3226 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3227 !sd->is_top(); sd = sd->sender()) {
3228 sd->verify();
3229 }
3230 }
3231
3232 void nmethod::verify_scopes() {
3233 if( !method() ) return; // Runtime stubs have no scope
3234 if (method()->is_native()) return; // Ignore stub methods.
3235 // iterate through all interrupt point
3236 // and verify the debug information is valid.
3237 RelocIterator iter(this);
3238 while (iter.next()) {
3239 address stub = nullptr;
3240 switch (iter.type()) {
3241 case relocInfo::virtual_call_type:
3242 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3243 break;
3244 case relocInfo::opt_virtual_call_type:
3245 stub = iter.opt_virtual_call_reloc()->static_stub();
3246 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3247 break;
3248 case relocInfo::static_call_type:
3249 stub = iter.static_call_reloc()->static_stub();
3250 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3251 break;
3252 case relocInfo::runtime_call_type:
3253 case relocInfo::runtime_call_w_cp_type: {
3254 address destination = iter.reloc()->value();
3255 // Right now there is no way to find out which entries support
3256 // an interrupt point. It would be nice if we had this
3257 // information in a table.
3258 break;
3259 }
3260 default:
3261 break;
3262 }
3263 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3264 }
3265 }
3266
3267
3268 // -----------------------------------------------------------------------------
3269 // Printing operations
3270
3271 void nmethod::print_on_impl(outputStream* st) const {
3272 ResourceMark rm;
3273
3274 st->print("Compiled method ");
3275
3276 if (is_compiled_by_c1()) {
3277 st->print("(c1) ");
3278 } else if (is_compiled_by_c2()) {
3279 st->print("(c2) ");
3280 } else {
3281 st->print("(n/a) ");
3282 }
3283
3284 print_on_with_msg(st, nullptr);
3285
3286 if (WizardMode) {
3287 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3288 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3289 st->print(" { ");
3290 st->print_cr("%s ", state());
3291 st->print_cr("}:");
3292 }
3293 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3294 p2i(this),
3295 p2i(this) + size(),
3296 size());
3297 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3298 p2i(consts_begin()),
3299 p2i(consts_end()),
3300 consts_size());
3301 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3302 p2i(insts_begin()),
3303 p2i(insts_end()),
3304 insts_size());
3305 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3306 p2i(stub_begin()),
3307 p2i(stub_end()),
3308 stub_size());
3309 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3310 p2i(oops_begin()),
3311 p2i(oops_end()),
3312 oops_size());
3313 if (mutable_data_size () > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3314 p2i(mutable_data_begin()),
3315 p2i(mutable_data_end()),
3316 mutable_data_size());
3317 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3318 p2i(relocation_begin()),
3319 p2i(relocation_end()),
3320 relocation_size());
3321 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3322 p2i(metadata_begin()),
3323 p2i(metadata_end()),
3324 metadata_size());
3325 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3326 p2i(immutable_data_begin()),
3327 p2i(immutable_data_end()),
3328 immutable_data_size());
3329 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3330 p2i(dependencies_begin()),
3331 p2i(dependencies_end()),
3332 dependencies_size());
3333 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3334 p2i(nul_chk_table_begin()),
3335 p2i(nul_chk_table_end()),
3336 nul_chk_table_size());
3337 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3338 p2i(handler_table_begin()),
3339 p2i(handler_table_end()),
3340 handler_table_size());
3341 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3342 p2i(scopes_pcs_begin()),
3343 p2i(scopes_pcs_end()),
3344 scopes_pcs_size());
3345 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3346 p2i(scopes_data_begin()),
3347 p2i(scopes_data_end()),
3348 scopes_data_size());
3349 }
3350
3351 void nmethod::print_code() {
3352 ResourceMark m;
3353 ttyLocker ttyl;
3354 // Call the specialized decode method of this class.
3355 decode(tty);
3356 }
3357
3358 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3359
3360 void nmethod::print_dependencies_on(outputStream* out) {
3361 ResourceMark rm;
3362 stringStream st;
3363 st.print_cr("Dependencies:");
3364 for (Dependencies::DepStream deps(this); deps.next(); ) {
3365 deps.print_dependency(&st);
3366 InstanceKlass* ctxk = deps.context_type();
3367 if (ctxk != nullptr) {
3368 if (ctxk->is_dependent_nmethod(this)) {
3369 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3370 }
3371 }
3372 deps.log_dependency(); // put it into the xml log also
3373 }
3374 out->print_raw(st.as_string());
3375 }
3376 #endif
3377
3378 #if defined(SUPPORT_DATA_STRUCTS)
3379
3380 // Print the oops from the underlying CodeBlob.
3381 void nmethod::print_oops(outputStream* st) {
3382 ResourceMark m;
3383 st->print("Oops:");
3384 if (oops_begin() < oops_end()) {
3385 st->cr();
3386 for (oop* p = oops_begin(); p < oops_end(); p++) {
3387 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3388 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3389 if (Universe::contains_non_oop_word(p)) {
3390 st->print_cr("NON_OOP");
3391 continue; // skip non-oops
3392 }
3393 if (*p == nullptr) {
3394 st->print_cr("nullptr-oop");
3395 continue; // skip non-oops
3396 }
3397 (*p)->print_value_on(st);
3398 st->cr();
3399 }
3400 } else {
3401 st->print_cr(" <list empty>");
3402 }
3403 }
3404
3405 // Print metadata pool.
3406 void nmethod::print_metadata(outputStream* st) {
3407 ResourceMark m;
3408 st->print("Metadata:");
3409 if (metadata_begin() < metadata_end()) {
3410 st->cr();
3411 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3412 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3413 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3414 if (*p && *p != Universe::non_oop_word()) {
3415 (*p)->print_value_on(st);
3416 }
3417 st->cr();
3418 }
3419 } else {
3420 st->print_cr(" <list empty>");
3421 }
3422 }
3423
3424 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3425 void nmethod::print_scopes_on(outputStream* st) {
3426 // Find the first pc desc for all scopes in the code and print it.
3427 ResourceMark rm;
3428 st->print("scopes:");
3429 if (scopes_pcs_begin() < scopes_pcs_end()) {
3430 st->cr();
3431 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3432 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3433 continue;
3434
3435 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3436 while (sd != nullptr) {
3437 sd->print_on(st, p); // print output ends with a newline
3438 sd = sd->sender();
3439 }
3440 }
3441 } else {
3442 st->print_cr(" <list empty>");
3443 }
3444 }
3445 #endif
3446
3447 #ifndef PRODUCT // RelocIterator does support printing only then.
3448 void nmethod::print_relocations() {
3449 ResourceMark m; // in case methods get printed via the debugger
3450 tty->print_cr("relocations:");
3451 RelocIterator iter(this);
3452 iter.print_on(tty);
3453 }
3454 #endif
3455
3456 void nmethod::print_pcs_on(outputStream* st) {
3457 ResourceMark m; // in case methods get printed via debugger
3458 st->print("pc-bytecode offsets:");
3459 if (scopes_pcs_begin() < scopes_pcs_end()) {
3460 st->cr();
3461 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3462 p->print_on(st, this); // print output ends with a newline
3463 }
3464 } else {
3465 st->print_cr(" <list empty>");
3466 }
3467 }
3468
3469 void nmethod::print_handler_table() {
3470 ExceptionHandlerTable(this).print(code_begin());
3471 }
3472
3473 void nmethod::print_nul_chk_table() {
3474 ImplicitExceptionTable(this).print(code_begin());
3475 }
3476
3477 void nmethod::print_recorded_oop(int log_n, int i) {
3478 void* value;
3479
3480 if (i == 0) {
3481 value = nullptr;
3482 } else {
3483 // Be careful around non-oop words. Don't create an oop
3484 // with that value, or it will assert in verification code.
3485 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3486 value = Universe::non_oop_word();
3487 } else {
3488 value = oop_at(i);
3489 }
3490 }
3491
3492 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3493
3494 if (value == Universe::non_oop_word()) {
3495 tty->print("non-oop word");
3496 } else {
3497 if (value == nullptr) {
3498 tty->print("nullptr-oop");
3499 } else {
3500 oop_at(i)->print_value_on(tty);
3501 }
3502 }
3503
3504 tty->cr();
3505 }
3506
3507 void nmethod::print_recorded_oops() {
3508 const int n = oops_count();
3509 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3510 tty->print("Recorded oops:");
3511 if (n > 0) {
3512 tty->cr();
3513 for (int i = 0; i < n; i++) {
3514 print_recorded_oop(log_n, i);
3515 }
3516 } else {
3517 tty->print_cr(" <list empty>");
3518 }
3519 }
3520
3521 void nmethod::print_recorded_metadata() {
3522 const int n = metadata_count();
3523 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3524 tty->print("Recorded metadata:");
3525 if (n > 0) {
3526 tty->cr();
3527 for (int i = 0; i < n; i++) {
3528 Metadata* m = metadata_at(i);
3529 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3530 if (m == (Metadata*)Universe::non_oop_word()) {
3531 tty->print("non-metadata word");
3532 } else if (m == nullptr) {
3533 tty->print("nullptr-oop");
3534 } else {
3535 Metadata::print_value_on_maybe_null(tty, m);
3536 }
3537 tty->cr();
3538 }
3539 } else {
3540 tty->print_cr(" <list empty>");
3541 }
3542 }
3543 #endif
3544
3545 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3546
3547 void nmethod::print_constant_pool(outputStream* st) {
3548 //-----------------------------------
3549 //---< Print the constant pool >---
3550 //-----------------------------------
3551 int consts_size = this->consts_size();
3552 if ( consts_size > 0 ) {
3553 unsigned char* cstart = this->consts_begin();
3554 unsigned char* cp = cstart;
3555 unsigned char* cend = cp + consts_size;
3556 unsigned int bytes_per_line = 4;
3557 unsigned int CP_alignment = 8;
3558 unsigned int n;
3559
3560 st->cr();
3561
3562 //---< print CP header to make clear what's printed >---
3563 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3564 n = bytes_per_line;
3565 st->print_cr("[Constant Pool]");
3566 Disassembler::print_location(cp, cstart, cend, st, true, true);
3567 Disassembler::print_hexdata(cp, n, st, true);
3568 st->cr();
3569 } else {
3570 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3571 st->print_cr("[Constant Pool (unaligned)]");
3572 }
3573
3574 //---< print CP contents, bytes_per_line at a time >---
3575 while (cp < cend) {
3576 Disassembler::print_location(cp, cstart, cend, st, true, false);
3577 Disassembler::print_hexdata(cp, n, st, false);
3578 cp += n;
3579 n = bytes_per_line;
3580 st->cr();
3581 }
3582
3583 //---< Show potential alignment gap between constant pool and code >---
3584 cend = code_begin();
3585 if( cp < cend ) {
3586 n = 4;
3587 st->print_cr("[Code entry alignment]");
3588 while (cp < cend) {
3589 Disassembler::print_location(cp, cstart, cend, st, false, false);
3590 cp += n;
3591 st->cr();
3592 }
3593 }
3594 } else {
3595 st->print_cr("[Constant Pool (empty)]");
3596 }
3597 st->cr();
3598 }
3599
3600 #endif
3601
3602 // Disassemble this nmethod.
3603 // Print additional debug information, if requested. This could be code
3604 // comments, block comments, profiling counters, etc.
3605 // The undisassembled format is useful no disassembler library is available.
3606 // The resulting hex dump (with markers) can be disassembled later, or on
3607 // another system, when/where a disassembler library is available.
3608 void nmethod::decode2(outputStream* ost) const {
3609
3610 // Called from frame::back_trace_with_decode without ResourceMark.
3611 ResourceMark rm;
3612
3613 // Make sure we have a valid stream to print on.
3614 outputStream* st = ost ? ost : tty;
3615
3616 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3617 const bool use_compressed_format = true;
3618 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3619 AbstractDisassembler::show_block_comment());
3620 #else
3621 const bool use_compressed_format = Disassembler::is_abstract();
3622 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3623 AbstractDisassembler::show_block_comment());
3624 #endif
3625
3626 st->cr();
3627 this->print_on(st);
3628 st->cr();
3629
3630 #if defined(SUPPORT_ASSEMBLY)
3631 //----------------------------------
3632 //---< Print real disassembly >---
3633 //----------------------------------
3634 if (! use_compressed_format) {
3635 st->print_cr("[Disassembly]");
3636 Disassembler::decode(const_cast<nmethod*>(this), st);
3637 st->bol();
3638 st->print_cr("[/Disassembly]");
3639 return;
3640 }
3641 #endif
3642
3643 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3644
3645 // Compressed undisassembled disassembly format.
3646 // The following status values are defined/supported:
3647 // = 0 - currently at bol() position, nothing printed yet on current line.
3648 // = 1 - currently at position after print_location().
3649 // > 1 - in the midst of printing instruction stream bytes.
3650 int compressed_format_idx = 0;
3651 int code_comment_column = 0;
3652 const int instr_maxlen = Assembler::instr_maxlen();
3653 const uint tabspacing = 8;
3654 unsigned char* start = this->code_begin();
3655 unsigned char* p = this->code_begin();
3656 unsigned char* end = this->code_end();
3657 unsigned char* pss = p; // start of a code section (used for offsets)
3658
3659 if ((start == nullptr) || (end == nullptr)) {
3660 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3661 return;
3662 }
3663 #endif
3664
3665 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3666 //---< plain abstract disassembly, no comments or anything, just section headers >---
3667 if (use_compressed_format && ! compressed_with_comments) {
3668 const_cast<nmethod*>(this)->print_constant_pool(st);
3669
3670 st->bol();
3671 st->cr();
3672 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3673 //---< Open the output (Marker for post-mortem disassembler) >---
3674 st->print_cr("[MachCode]");
3675 const char* header = nullptr;
3676 address p0 = p;
3677 while (p < end) {
3678 address pp = p;
3679 while ((p < end) && (header == nullptr)) {
3680 header = nmethod_section_label(p);
3681 pp = p;
3682 p += Assembler::instr_len(p);
3683 }
3684 if (pp > p0) {
3685 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3686 p0 = pp;
3687 p = pp;
3688 header = nullptr;
3689 } else if (header != nullptr) {
3690 st->bol();
3691 st->print_cr("%s", header);
3692 header = nullptr;
3693 }
3694 }
3695 //---< Close the output (Marker for post-mortem disassembler) >---
3696 st->bol();
3697 st->print_cr("[/MachCode]");
3698 return;
3699 }
3700 #endif
3701
3702 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3703 //---< abstract disassembly with comments and section headers merged in >---
3704 if (compressed_with_comments) {
3705 const_cast<nmethod*>(this)->print_constant_pool(st);
3706
3707 st->bol();
3708 st->cr();
3709 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3710 //---< Open the output (Marker for post-mortem disassembler) >---
3711 st->print_cr("[MachCode]");
3712 while ((p < end) && (p != nullptr)) {
3713 const int instruction_size_in_bytes = Assembler::instr_len(p);
3714
3715 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3716 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3717 // Prints nmethod_section_label as well.
3718 if (AbstractDisassembler::show_block_comment()) {
3719 print_block_comment(st, p);
3720 if (st->position() == 0) {
3721 compressed_format_idx = 0;
3722 }
3723 }
3724
3725 //---< New location information after line break >---
3726 if (compressed_format_idx == 0) {
3727 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3728 compressed_format_idx = 1;
3729 }
3730
3731 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3732 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3733 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3734
3735 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3736 //---< interrupt instruction byte stream for code comment >---
3737 if (compressed_format_idx > 1) {
3738 st->cr(); // interrupt byte stream
3739 st->cr(); // add an empty line
3740 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3741 }
3742 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3743 st->bol();
3744 compressed_format_idx = 0;
3745 }
3746
3747 //---< New location information after line break >---
3748 if (compressed_format_idx == 0) {
3749 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3750 compressed_format_idx = 1;
3751 }
3752
3753 //---< Nicely align instructions for readability >---
3754 if (compressed_format_idx > 1) {
3755 Disassembler::print_delimiter(st);
3756 }
3757
3758 //---< Now, finally, print the actual instruction bytes >---
3759 unsigned char* p0 = p;
3760 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3761 compressed_format_idx += (int)(p - p0);
3762
3763 if (Disassembler::start_newline(compressed_format_idx-1)) {
3764 st->cr();
3765 compressed_format_idx = 0;
3766 }
3767 }
3768 //---< Close the output (Marker for post-mortem disassembler) >---
3769 st->bol();
3770 st->print_cr("[/MachCode]");
3771 return;
3772 }
3773 #endif
3774 }
3775
3776 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3777
3778 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3779 RelocIterator iter(this, begin, end);
3780 bool have_one = false;
3781 while (iter.next()) {
3782 have_one = true;
3783 switch (iter.type()) {
3784 case relocInfo::none: {
3785 // Skip it and check next
3786 break;
3787 }
3788 case relocInfo::oop_type: {
3789 // Get a non-resizable resource-allocated stringStream.
3790 // Our callees make use of (nested) ResourceMarks.
3791 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3792 oop_Relocation* r = iter.oop_reloc();
3793 oop obj = r->oop_value();
3794 st.print("oop(");
3795 if (obj == nullptr) st.print("nullptr");
3796 else obj->print_value_on(&st);
3797 st.print(")");
3798 return st.as_string();
3799 }
3800 case relocInfo::metadata_type: {
3801 stringStream st;
3802 metadata_Relocation* r = iter.metadata_reloc();
3803 Metadata* obj = r->metadata_value();
3804 st.print("metadata(");
3805 if (obj == nullptr) st.print("nullptr");
3806 else obj->print_value_on(&st);
3807 st.print(")");
3808 return st.as_string();
3809 }
3810 case relocInfo::runtime_call_type:
3811 case relocInfo::runtime_call_w_cp_type: {
3812 stringStream st;
3813 st.print("runtime_call");
3814 CallRelocation* r = (CallRelocation*)iter.reloc();
3815 address dest = r->destination();
3816 if (StubRoutines::contains(dest)) {
3817 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3818 if (desc == nullptr) {
3819 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3820 }
3821 if (desc != nullptr) {
3822 st.print(" Stub::%s", desc->name());
3823 return st.as_string();
3824 }
3825 }
3826 CodeBlob* cb = CodeCache::find_blob(dest);
3827 if (cb != nullptr) {
3828 st.print(" %s", cb->name());
3829 } else {
3830 ResourceMark rm;
3831 const int buflen = 1024;
3832 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3833 int offset;
3834 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3835 st.print(" %s", buf);
3836 if (offset != 0) {
3837 st.print("+%d", offset);
3838 }
3839 }
3840 }
3841 return st.as_string();
3842 }
3843 case relocInfo::virtual_call_type: {
3844 stringStream st;
3845 st.print_raw("virtual_call");
3846 virtual_call_Relocation* r = iter.virtual_call_reloc();
3847 Method* m = r->method_value();
3848 if (m != nullptr) {
3849 assert(m->is_method(), "");
3850 m->print_short_name(&st);
3851 }
3852 return st.as_string();
3853 }
3854 case relocInfo::opt_virtual_call_type: {
3855 stringStream st;
3856 st.print_raw("optimized virtual_call");
3857 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3858 Method* m = r->method_value();
3859 if (m != nullptr) {
3860 assert(m->is_method(), "");
3861 m->print_short_name(&st);
3862 }
3863 return st.as_string();
3864 }
3865 case relocInfo::static_call_type: {
3866 stringStream st;
3867 st.print_raw("static_call");
3868 static_call_Relocation* r = iter.static_call_reloc();
3869 Method* m = r->method_value();
3870 if (m != nullptr) {
3871 assert(m->is_method(), "");
3872 m->print_short_name(&st);
3873 }
3874 return st.as_string();
3875 }
3876 case relocInfo::static_stub_type: return "static_stub";
3877 case relocInfo::external_word_type: return "external_word";
3878 case relocInfo::internal_word_type: return "internal_word";
3879 case relocInfo::section_word_type: return "section_word";
3880 case relocInfo::poll_type: return "poll";
3881 case relocInfo::poll_return_type: return "poll_return";
3882 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3883 case relocInfo::entry_guard_type: return "entry_guard";
3884 case relocInfo::post_call_nop_type: return "post_call_nop";
3885 case relocInfo::barrier_type: {
3886 barrier_Relocation* const reloc = iter.barrier_reloc();
3887 stringStream st;
3888 st.print("barrier format=%d", reloc->format());
3889 return st.as_string();
3890 }
3891
3892 case relocInfo::type_mask: return "type_bit_mask";
3893
3894 default: {
3895 stringStream st;
3896 st.print("unknown relocInfo=%d", (int) iter.type());
3897 return st.as_string();
3898 }
3899 }
3900 }
3901 return have_one ? "other" : nullptr;
3902 }
3903
3904 // Return the last scope in (begin..end]
3905 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3906 PcDesc* p = pc_desc_near(begin+1);
3907 if (p != nullptr && p->real_pc(this) <= end) {
3908 return new ScopeDesc(this, p);
3909 }
3910 return nullptr;
3911 }
3912
3913 const char* nmethod::nmethod_section_label(address pos) const {
3914 const char* label = nullptr;
3915 if (pos == code_begin()) label = "[Instructions begin]";
3916 if (pos == entry_point()) label = "[Entry Point]";
3917 if (pos == inline_entry_point()) label = "[Inline Entry Point]";
3918 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3919 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]";
3920 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]";
3921 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3922 // Check stub_code before checking exception_handler or deopt_handler.
3923 if (pos == this->stub_begin()) label = "[Stub Code]";
3924 if (pos == exception_begin()) label = "[Exception Handler]";
3925 if (pos == deopt_handler_entry()) label = "[Deopt Handler Entry Point]";
3926 return label;
3927 }
3928
3929 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) {
3930 if (pos == entry) {
3931 stream->bol();
3932 stream->print_cr("%s", label);
3933 return 1;
3934 } else {
3935 return 0;
3936 }
3937 }
3938
3939 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3940 if (print_section_labels) {
3941 int n = 0;
3942 // Multiple entry points may be at the same position. Print them all.
3943 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]");
3944 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]");
3945 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]");
3946 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]");
3947 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]");
3948 if (n == 0) {
3949 const char* label = nmethod_section_label(block_begin);
3950 if (label != nullptr) {
3951 stream->bol();
3952 stream->print_cr("%s", label);
3953 }
3954 }
3955 }
3956
3957 Method* m = method();
3958 if (m == nullptr || is_osr_method()) {
3959 return;
3960 }
3961
3962 // Print the name of the method (only once)
3963 address low = MIN3(entry_point(),
3964 verified_entry_point(),
3965 inline_entry_point());
3966 // The verified inline entry point and verified inline RO entry point are not always
3967 // used. When they are unused. CodeOffsets::Verified_Inline_Entry(_RO) is -1. Hence,
3968 // the calculated entry point is smaller than the block they are offsetting into.
3969 if (verified_inline_entry_point() >= block_begin) {
3970 low = MIN2(low, verified_inline_entry_point());
3971 }
3972 if (verified_inline_ro_entry_point() >= block_begin) {
3973 low = MIN2(low, verified_inline_ro_entry_point());
3974 }
3975 assert(low != nullptr, "sanity");
3976 if (block_begin == low) {
3977 stream->print(" # ");
3978 m->print_value_on(stream);
3979 stream->cr();
3980 }
3981
3982 // Print the arguments for the 3 types of verified entry points
3983 CompiledEntrySignature ces(m);
3984 ces.compute_calling_conventions(false);
3985 const GrowableArray<SigEntry>* sig_cc;
3986 const VMRegPair* regs;
3987 if (block_begin == verified_entry_point()) {
3988 sig_cc = ces.sig_cc();
3989 regs = ces.regs_cc();
3990 } else if (block_begin == verified_inline_entry_point()) {
3991 sig_cc = ces.sig();
3992 regs = ces.regs();
3993 } else if (block_begin == verified_inline_ro_entry_point()) {
3994 sig_cc = ces.sig_cc_ro();
3995 regs = ces.regs_cc_ro();
3996 } else {
3997 return;
3998 }
3999
4000 bool has_this = !m->is_static();
4001 if (ces.has_inline_recv() && block_begin == verified_entry_point()) {
4002 // <this> argument is scalarized for verified_entry_point()
4003 has_this = false;
4004 }
4005 const char* spname = "sp"; // make arch-specific?
4006 int stack_slot_offset = this->frame_size() * wordSize;
4007 int tab1 = 14, tab2 = 24;
4008 int sig_index = 0;
4009 int arg_index = has_this ? -1 : 0;
4010 bool did_old_sp = false;
4011 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) {
4012 bool at_this = (arg_index == -1);
4013 bool at_old_sp = false;
4014 BasicType t = (*sig)._bt;
4015 if (at_this) {
4016 stream->print(" # this: ");
4017 } else {
4018 stream->print(" # parm%d: ", arg_index);
4019 }
4020 stream->move_to(tab1);
4021 VMReg fst = regs[sig_index].first();
4022 VMReg snd = regs[sig_index].second();
4023 if (fst->is_reg()) {
4024 stream->print("%s", fst->name());
4025 if (snd->is_valid()) {
4026 stream->print(":%s", snd->name());
4027 }
4028 } else if (fst->is_stack()) {
4029 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
4030 if (offset == stack_slot_offset) at_old_sp = true;
4031 stream->print("[%s+0x%x]", spname, offset);
4032 } else {
4033 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
4034 }
4035 stream->print(" ");
4036 stream->move_to(tab2);
4037 stream->print("= ");
4038 if (at_this) {
4039 m->method_holder()->print_value_on(stream);
4040 } else {
4041 bool did_name = false;
4042 if (is_reference_type(t) && !(*sig)._vt_oop) {
4043 Symbol* name = (*sig)._name;
4044 name->print_value_on(stream);
4045 did_name = true;
4046 }
4047 if (!did_name)
4048 stream->print("%s", type2name(t));
4049 if ((*sig)._null_marker) {
4050 stream->print(" (null marker)");
4051 }
4052 if ((*sig)._vt_oop) {
4053 stream->print(" (VT OOP)");
4054 }
4055 }
4056 if (at_old_sp) {
4057 stream->print(" (%s of caller)", spname);
4058 did_old_sp = true;
4059 }
4060 stream->cr();
4061 sig_index += type2size[t];
4062 arg_index += 1;
4063 }
4064 if (!did_old_sp) {
4065 stream->print(" # ");
4066 stream->move_to(tab1);
4067 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4068 stream->print(" (%s of caller)", spname);
4069 stream->cr();
4070 }
4071 }
4072
4073 // Returns whether this nmethod has code comments.
4074 bool nmethod::has_code_comment(address begin, address end) {
4075 // scopes?
4076 ScopeDesc* sd = scope_desc_in(begin, end);
4077 if (sd != nullptr) return true;
4078
4079 // relocations?
4080 const char* str = reloc_string_for(begin, end);
4081 if (str != nullptr) return true;
4082
4083 // implicit exceptions?
4084 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4085 if (cont_offset != 0) return true;
4086
4087 return false;
4088 }
4089
4090 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4091 ImplicitExceptionTable implicit_table(this);
4092 int pc_offset = (int)(begin - code_begin());
4093 int cont_offset = implicit_table.continuation_offset(pc_offset);
4094 bool oop_map_required = false;
4095 if (cont_offset != 0) {
4096 st->move_to(column, 6, 0);
4097 if (pc_offset == cont_offset) {
4098 st->print("; implicit exception: deoptimizes");
4099 oop_map_required = true;
4100 } else {
4101 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4102 }
4103 }
4104
4105 // Find an oopmap in (begin, end]. We use the odd half-closed
4106 // interval so that oop maps and scope descs which are tied to the
4107 // byte after a call are printed with the call itself. OopMaps
4108 // associated with implicit exceptions are printed with the implicit
4109 // instruction.
4110 address base = code_begin();
4111 ImmutableOopMapSet* oms = oop_maps();
4112 if (oms != nullptr) {
4113 for (int i = 0, imax = oms->count(); i < imax; i++) {
4114 const ImmutableOopMapPair* pair = oms->pair_at(i);
4115 const ImmutableOopMap* om = pair->get_from(oms);
4116 address pc = base + pair->pc_offset();
4117 if (pc >= begin) {
4118 if (pc > begin && pc <= end) {
4119 st->move_to(column, 6, 0);
4120 st->print("; ");
4121 om->print_on(st);
4122 oop_map_required = false;
4123 }
4124 }
4125 if (pc > end) {
4126 break;
4127 }
4128 }
4129 }
4130 assert(!oop_map_required, "missed oopmap");
4131
4132 Thread* thread = Thread::current();
4133
4134 // Print any debug info present at this pc.
4135 ScopeDesc* sd = scope_desc_in(begin, end);
4136 if (sd != nullptr) {
4137 st->move_to(column, 6, 0);
4138 if (sd->bci() == SynchronizationEntryBCI) {
4139 st->print(";*synchronization entry");
4140 } else if (sd->bci() == AfterBci) {
4141 st->print(";* method exit (unlocked if synchronized)");
4142 } else if (sd->bci() == UnwindBci) {
4143 st->print(";* unwind (locked if synchronized)");
4144 } else if (sd->bci() == AfterExceptionBci) {
4145 st->print(";* unwind (unlocked if synchronized)");
4146 } else if (sd->bci() == UnknownBci) {
4147 st->print(";* unknown");
4148 } else if (sd->bci() == InvalidFrameStateBci) {
4149 st->print(";* invalid frame state");
4150 } else {
4151 if (sd->method() == nullptr) {
4152 st->print("method is nullptr");
4153 } else if (sd->method()->is_native()) {
4154 st->print("method is native");
4155 } else {
4156 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4157 st->print(";*%s", Bytecodes::name(bc));
4158 switch (bc) {
4159 case Bytecodes::_invokevirtual:
4160 case Bytecodes::_invokespecial:
4161 case Bytecodes::_invokestatic:
4162 case Bytecodes::_invokeinterface:
4163 {
4164 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4165 st->print(" ");
4166 if (invoke.name() != nullptr)
4167 invoke.name()->print_symbol_on(st);
4168 else
4169 st->print("<UNKNOWN>");
4170 break;
4171 }
4172 case Bytecodes::_getfield:
4173 case Bytecodes::_putfield:
4174 case Bytecodes::_getstatic:
4175 case Bytecodes::_putstatic:
4176 {
4177 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4178 st->print(" ");
4179 if (field.name() != nullptr)
4180 field.name()->print_symbol_on(st);
4181 else
4182 st->print("<UNKNOWN>");
4183 }
4184 default:
4185 break;
4186 }
4187 }
4188 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized());
4189 }
4190
4191 // Print all scopes
4192 for (;sd != nullptr; sd = sd->sender()) {
4193 st->move_to(column, 6, 0);
4194 st->print("; -");
4195 if (sd->should_reexecute()) {
4196 st->print(" (reexecute)");
4197 }
4198 if (sd->method() == nullptr) {
4199 st->print("method is nullptr");
4200 } else {
4201 sd->method()->print_short_name(st);
4202 }
4203 int lineno = sd->method()->line_number_from_bci(sd->bci());
4204 if (lineno != -1) {
4205 st->print("@%d (line %d)", sd->bci(), lineno);
4206 } else {
4207 st->print("@%d", sd->bci());
4208 }
4209 st->cr();
4210 }
4211 }
4212
4213 // Print relocation information
4214 // Prevent memory leak: allocating without ResourceMark.
4215 ResourceMark rm;
4216 const char* str = reloc_string_for(begin, end);
4217 if (str != nullptr) {
4218 if (sd != nullptr) st->cr();
4219 st->move_to(column, 6, 0);
4220 st->print("; {%s}", str);
4221 }
4222 }
4223
4224 #endif
4225
4226 address nmethod::call_instruction_address(address pc) const {
4227 if (NativeCall::is_call_before(pc)) {
4228 NativeCall *ncall = nativeCall_before(pc);
4229 return ncall->instruction_address();
4230 }
4231 return nullptr;
4232 }
4233
4234 void nmethod::print_value_on_impl(outputStream* st) const {
4235 st->print_cr("nmethod");
4236 #if defined(SUPPORT_DATA_STRUCTS)
4237 print_on_with_msg(st, nullptr);
4238 #endif
4239 }
4240
4241 void nmethod::print_code_snippet(outputStream* st, address addr) const {
4242 if (entry_point() <= addr && addr < code_end()) {
4243 // Pointing into the nmethod's code. Try to disassemble some instructions around addr.
4244 // Determine conservative start and end points.
4245 address start;
4246 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
4247 addr >= code_begin() + frame_complete_offset()) {
4248 start = code_begin() + frame_complete_offset();
4249 } else {
4250 start = (addr < verified_entry_point()) ? entry_point() : verified_entry_point();
4251 }
4252 address start_for_hex_dump = start; // We can choose a different starting point for hex dump, below.
4253 address end = code_end();
4254
4255 // Try using relocations to find closer instruction start and end points.
4256 // (Some platforms have variable length instructions and can only
4257 // disassemble correctly at instruction start addresses.)
4258 RelocIterator iter((nmethod*)this, start);
4259 while (iter.next() && iter.addr() < addr) { // find relocation before addr
4260 // Note: There's a relocation which doesn't point to an instruction start:
4261 // ZBarrierRelocationFormatStoreGoodAfterMov with ZGC on x86_64
4262 // We could detect and skip it, but hex dump is still usable when
4263 // disassembler produces garbage in such a very rare case.
4264 start = iter.addr();
4265 // We want at least 64 Bytes ahead in hex dump.
4266 if (iter.addr() <= (addr - 64)) start_for_hex_dump = iter.addr();
4267 }
4268 if (iter.has_current()) {
4269 if (iter.addr() == addr) iter.next(); // find relocation after addr
4270 if (iter.has_current()) end = iter.addr();
4271 }
4272
4273 // Always print hex. Disassembler may still have problems when hitting an incorrect instruction start.
4274 os::print_hex_dump(st, start_for_hex_dump, end, 1, /* print_ascii=*/false);
4275 if (!Disassembler::is_abstract()) {
4276 Disassembler::decode(start, end, st);
4277 }
4278 }
4279 }
4280
4281 #ifndef PRODUCT
4282
4283 void nmethod::print_calls(outputStream* st) {
4284 RelocIterator iter(this);
4285 while (iter.next()) {
4286 switch (iter.type()) {
4287 case relocInfo::virtual_call_type: {
4288 CompiledICLocker ml_verify(this);
4289 CompiledIC_at(&iter)->print();
4290 break;
4291 }
4292 case relocInfo::static_call_type:
4293 case relocInfo::opt_virtual_call_type:
4294 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4295 CompiledDirectCall::at(iter.reloc())->print();
4296 break;
4297 default:
4298 break;
4299 }
4300 }
4301 }
4302
4303 void nmethod::print_statistics() {
4304 ttyLocker ttyl;
4305 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4306 native_nmethod_stats.print_native_nmethod_stats();
4307 #ifdef COMPILER1
4308 c1_java_nmethod_stats.print_nmethod_stats("C1");
4309 #endif
4310 #ifdef COMPILER2
4311 c2_java_nmethod_stats.print_nmethod_stats("C2");
4312 #endif
4313 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4314 DebugInformationRecorder::print_statistics();
4315 pc_nmethod_stats.print_pc_stats();
4316 Dependencies::print_statistics();
4317 ExternalsRecorder::print_statistics();
4318 if (xtty != nullptr) xtty->tail("statistics");
4319 }
4320
4321 #endif // !PRODUCT