1 /*
2 * Copyright (c) 1997, 2025, 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 "code/aotCodeCache.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/relocInfo.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compilationLog.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compileTask.hpp"
39 #include "compiler/compilerDirectives.hpp"
40 #include "compiler/compilerOracle.hpp"
41 #include "compiler/directivesParser.hpp"
42 #include "compiler/disassembler.hpp"
43 #include "compiler/oopMap.inline.hpp"
44 #include "gc/shared/barrierSet.hpp"
45 #include "gc/shared/barrierSetNMethod.hpp"
46 #include "gc/shared/classUnloadingContext.hpp"
47 #include "gc/shared/collectedHeap.hpp"
48 #include "interpreter/bytecode.inline.hpp"
49 #include "jvm.h"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "memory/allocation.inline.hpp"
53 #include "memory/resourceArea.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/access.inline.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/weakHandle.inline.hpp"
61 #include "prims/jvmtiImpl.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "prims/methodHandles.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/atomic.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/flags/flagSetting.hpp"
68 #include "runtime/frame.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/jniHandles.inline.hpp"
71 #include "runtime/orderAccess.hpp"
72 #include "runtime/os.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/serviceThread.hpp"
75 #include "runtime/sharedRuntime.hpp"
76 #include "runtime/signature.hpp"
77 #include "runtime/threadWXSetters.inline.hpp"
78 #include "runtime/vmThread.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/globalDefinitions.hpp"
84 #include "utilities/resourceHash.hpp"
85 #include "utilities/xmlstream.hpp"
86 #if INCLUDE_JVMCI
87 #include "jvmci/jvmciRuntime.hpp"
88 #endif
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 #if INCLUDE_JVMCI
145 uint speculations_size;
146 uint jvmci_data_size;
147 #endif
148
149 void note_nmethod(nmethod* nm) {
150 nmethod_count += 1;
151 total_nm_size += nm->size();
152 total_immut_size += nm->immutable_data_size();
153 total_mut_size += nm->mutable_data_size();
154 relocation_size += nm->relocation_size();
155 consts_size += nm->consts_size();
156 insts_size += nm->insts_size();
157 stub_size += nm->stub_size();
158 oops_size += nm->oops_size();
159 metadata_size += nm->metadata_size();
160 scopes_data_size += nm->scopes_data_size();
161 scopes_pcs_size += nm->scopes_pcs_size();
162 dependencies_size += nm->dependencies_size();
163 handler_table_size += nm->handler_table_size();
164 nul_chk_table_size += nm->nul_chk_table_size();
165 #if INCLUDE_JVMCI
166 speculations_size += nm->speculations_size();
167 jvmci_data_size += nm->jvmci_data_size();
168 #endif
169 }
170 void print_nmethod_stats(const char* name) {
171 if (nmethod_count == 0) return;
172 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
173 uint total_size = total_nm_size + total_immut_size + total_mut_size;
174 if (total_nm_size != 0) {
175 tty->print_cr(" total size = %u (100%%)", total_size);
176 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
177 }
178 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
179 if (nmethod_count != 0) {
180 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
181 }
182 if (consts_size != 0) {
183 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
184 }
185 if (insts_size != 0) {
186 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
187 }
188 if (stub_size != 0) {
189 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
190 }
191 if (oops_size != 0) {
192 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
193 }
194 if (total_mut_size != 0) {
195 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
196 }
197 if (relocation_size != 0) {
198 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
199 }
200 if (metadata_size != 0) {
201 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
202 }
203 #if INCLUDE_JVMCI
204 if (jvmci_data_size != 0) {
205 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_mut_size);
206 }
207 #endif
208 if (total_immut_size != 0) {
209 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
210 }
211 if (dependencies_size != 0) {
212 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
213 }
214 if (nul_chk_table_size != 0) {
215 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
216 }
217 if (handler_table_size != 0) {
218 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
219 }
220 if (scopes_pcs_size != 0) {
221 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
222 }
223 if (scopes_data_size != 0) {
224 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
225 }
226 #if INCLUDE_JVMCI
227 if (speculations_size != 0) {
228 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size);
229 }
230 #endif
231 }
232 };
233
234 struct native_nmethod_stats_struct {
235 uint native_nmethod_count;
236 uint native_total_size;
237 uint native_relocation_size;
238 uint native_insts_size;
239 uint native_oops_size;
240 uint native_metadata_size;
241 void note_native_nmethod(nmethod* nm) {
242 native_nmethod_count += 1;
243 native_total_size += nm->size();
244 native_relocation_size += nm->relocation_size();
245 native_insts_size += nm->insts_size();
246 native_oops_size += nm->oops_size();
247 native_metadata_size += nm->metadata_size();
248 }
249 void print_native_nmethod_stats() {
250 if (native_nmethod_count == 0) return;
251 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
252 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
253 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
254 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
255 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
256 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
257 }
258 };
259
260 struct pc_nmethod_stats_struct {
261 uint pc_desc_init; // number of initialization of cache (= number of caches)
262 uint pc_desc_queries; // queries to nmethod::find_pc_desc
263 uint pc_desc_approx; // number of those which have approximate true
264 uint pc_desc_repeats; // number of _pc_descs[0] hits
265 uint pc_desc_hits; // number of LRU cache hits
266 uint pc_desc_tests; // total number of PcDesc examinations
267 uint pc_desc_searches; // total number of quasi-binary search steps
268 uint pc_desc_adds; // number of LUR cache insertions
269
270 void print_pc_stats() {
271 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
272 pc_desc_queries,
273 (double)(pc_desc_tests + pc_desc_searches)
274 / pc_desc_queries);
275 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
276 pc_desc_init,
277 pc_desc_queries, pc_desc_approx,
278 pc_desc_repeats, pc_desc_hits,
279 pc_desc_tests, pc_desc_searches, pc_desc_adds);
280 }
281 };
282
283 #ifdef COMPILER1
284 static java_nmethod_stats_struct c1_java_nmethod_stats;
285 #endif
286 #ifdef COMPILER2
287 static java_nmethod_stats_struct c2_java_nmethod_stats;
288 #endif
289 #if INCLUDE_JVMCI
290 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
291 #endif
292 static java_nmethod_stats_struct unknown_java_nmethod_stats;
293
294 static native_nmethod_stats_struct native_nmethod_stats;
295 static pc_nmethod_stats_struct pc_nmethod_stats;
296
297 static void note_java_nmethod(nmethod* nm) {
298 #ifdef COMPILER1
299 if (nm->is_compiled_by_c1()) {
300 c1_java_nmethod_stats.note_nmethod(nm);
301 } else
302 #endif
303 #ifdef COMPILER2
304 if (nm->is_compiled_by_c2()) {
305 c2_java_nmethod_stats.note_nmethod(nm);
306 } else
307 #endif
308 #if INCLUDE_JVMCI
309 if (nm->is_compiled_by_jvmci()) {
310 jvmci_java_nmethod_stats.note_nmethod(nm);
311 } else
312 #endif
313 {
314 unknown_java_nmethod_stats.note_nmethod(nm);
315 }
316 }
317 #endif // !PRODUCT
318
319 //---------------------------------------------------------------------------------
320
321
322 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
323 assert(pc != nullptr, "Must be non null");
324 assert(exception.not_null(), "Must be non null");
325 assert(handler != nullptr, "Must be non null");
326
327 _count = 0;
328 _exception_type = exception->klass();
329 _next = nullptr;
330 _purge_list_next = nullptr;
331
332 add_address_and_handler(pc,handler);
333 }
334
335
336 address ExceptionCache::match(Handle exception, address pc) {
337 assert(pc != nullptr,"Must be non null");
338 assert(exception.not_null(),"Must be non null");
339 if (exception->klass() == exception_type()) {
340 return (test_address(pc));
341 }
342
343 return nullptr;
344 }
345
346
347 bool ExceptionCache::match_exception_with_space(Handle exception) {
348 assert(exception.not_null(),"Must be non null");
349 if (exception->klass() == exception_type() && count() < cache_size) {
350 return true;
351 }
352 return false;
353 }
354
355
356 address ExceptionCache::test_address(address addr) {
357 int limit = count();
358 for (int i = 0; i < limit; i++) {
359 if (pc_at(i) == addr) {
360 return handler_at(i);
361 }
362 }
363 return nullptr;
364 }
365
366
367 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
368 if (test_address(addr) == handler) return true;
369
370 int index = count();
371 if (index < cache_size) {
372 set_pc_at(index, addr);
373 set_handler_at(index, handler);
374 increment_count();
375 return true;
376 }
377 return false;
378 }
379
380 ExceptionCache* ExceptionCache::next() {
381 return Atomic::load(&_next);
382 }
383
384 void ExceptionCache::set_next(ExceptionCache *ec) {
385 Atomic::store(&_next, ec);
386 }
387
388 //-----------------------------------------------------------------------------
389
390
391 // Helper used by both find_pc_desc methods.
392 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
393 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
394 if (!approximate) {
395 return pc->pc_offset() == pc_offset;
396 } else {
397 // Do not look before the sentinel
398 assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
399 return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
400 }
401 }
402
403 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
404 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
405 // initialize the cache by filling it with benign (non-null) values
406 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
407 "must start with a sentinel");
408 for (int i = 0; i < cache_size; i++) {
409 _pc_descs[i] = initial_pc_desc;
410 }
411 }
412
413 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
414 // Note: one might think that caching the most recently
415 // read value separately would be a win, but one would be
416 // wrong. When many threads are updating it, the cache
417 // line it's in would bounce between caches, negating
418 // any benefit.
419
420 // In order to prevent race conditions do not load cache elements
421 // repeatedly, but use a local copy:
422 PcDesc* res;
423
424 // Step one: Check the most recently added value.
425 res = _pc_descs[0];
426 assert(res != nullptr, "PcDesc cache should be initialized already");
427
428 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
429 if (approximate && match_desc(res, pc_offset, approximate)) {
430 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
431 return res;
432 }
433
434 // Step two: Check the rest of the LRU cache.
435 for (int i = 1; i < cache_size; ++i) {
436 res = _pc_descs[i];
437 if (res->pc_offset() < 0) break; // optimization: skip empty cache
438 if (match_desc(res, pc_offset, approximate)) {
439 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
440 return res;
441 }
442 }
443
444 // Report failure.
445 return nullptr;
446 }
447
448 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
449 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
450 // Update the LRU cache by shifting pc_desc forward.
451 for (int i = 0; i < cache_size; i++) {
452 PcDesc* next = _pc_descs[i];
453 _pc_descs[i] = pc_desc;
454 pc_desc = next;
455 }
456 }
457
458 // adjust pcs_size so that it is a multiple of both oopSize and
459 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
460 // of oopSize, then 2*sizeof(PcDesc) is)
461 static int adjust_pcs_size(int pcs_size) {
462 int nsize = align_up(pcs_size, oopSize);
463 if ((nsize % sizeof(PcDesc)) != 0) {
464 nsize = pcs_size + sizeof(PcDesc);
465 }
466 assert((nsize % oopSize) == 0, "correct alignment");
467 return nsize;
468 }
469
470 bool nmethod::is_method_handle_return(address return_pc) {
471 if (!has_method_handle_invokes()) return false;
472 PcDesc* pd = pc_desc_at(return_pc);
473 if (pd == nullptr)
474 return false;
475 return pd->is_method_handle_invoke();
476 }
477
478 // Returns a string version of the method state.
479 const char* nmethod::state() const {
480 int state = get_state();
481 switch (state) {
482 case not_installed:
483 return "not installed";
484 case in_use:
485 return "in use";
486 case not_entrant:
487 return "not_entrant";
488 default:
489 fatal("unexpected method state: %d", state);
490 return nullptr;
491 }
492 }
493
494 void nmethod::set_deoptimized_done() {
495 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
496 if (_deoptimization_status != deoptimize_done) { // can't go backwards
497 Atomic::store(&_deoptimization_status, deoptimize_done);
498 }
499 }
500
501 ExceptionCache* nmethod::exception_cache_acquire() const {
502 return Atomic::load_acquire(&_exception_cache);
503 }
504
505 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
506 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
507 assert(new_entry != nullptr,"Must be non null");
508 assert(new_entry->next() == nullptr, "Must be null");
509
510 for (;;) {
511 ExceptionCache *ec = exception_cache();
512 if (ec != nullptr) {
513 Klass* ex_klass = ec->exception_type();
514 if (!ex_klass->is_loader_alive()) {
515 // We must guarantee that entries are not inserted with new next pointer
516 // edges to ExceptionCache entries with dead klasses, due to bad interactions
517 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
518 // the head pointer forward to the first live ExceptionCache, so that the new
519 // next pointers always point at live ExceptionCaches, that are not removed due
520 // to concurrent ExceptionCache cleanup.
521 ExceptionCache* next = ec->next();
522 if (Atomic::cmpxchg(&_exception_cache, ec, next) == ec) {
523 CodeCache::release_exception_cache(ec);
524 }
525 continue;
526 }
527 ec = exception_cache();
528 if (ec != nullptr) {
529 new_entry->set_next(ec);
530 }
531 }
532 if (Atomic::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
533 return;
534 }
535 }
536 }
537
538 void nmethod::clean_exception_cache() {
539 // For each nmethod, only a single thread may call this cleanup function
540 // at the same time, whether called in STW cleanup or concurrent cleanup.
541 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
542 // then a single writer may contend with cleaning up the head pointer to the
543 // first ExceptionCache node that has a Klass* that is alive. That is fine,
544 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
545 // And the concurrent writers do not clean up next pointers, only the head.
546 // Also note that concurrent readers will walk through Klass* pointers that are not
547 // alive. That does not cause ABA problems, because Klass* is deleted after
548 // a handshake with all threads, after all stale ExceptionCaches have been
549 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
550 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
551 // That similarly implies that CAS operations on ExceptionCache entries do not
552 // suffer from ABA problems as unlinking and deletion is separated by a global
553 // handshake operation.
554 ExceptionCache* prev = nullptr;
555 ExceptionCache* curr = exception_cache_acquire();
556
557 while (curr != nullptr) {
558 ExceptionCache* next = curr->next();
559
560 if (!curr->exception_type()->is_loader_alive()) {
561 if (prev == nullptr) {
562 // Try to clean head; this is contended by concurrent inserts, that
563 // both lazily clean the head, and insert entries at the head. If
564 // the CAS fails, the operation is restarted.
565 if (Atomic::cmpxchg(&_exception_cache, curr, next) != curr) {
566 prev = nullptr;
567 curr = exception_cache_acquire();
568 continue;
569 }
570 } else {
571 // It is impossible to during cleanup connect the next pointer to
572 // an ExceptionCache that has not been published before a safepoint
573 // prior to the cleanup. Therefore, release is not required.
574 prev->set_next(next);
575 }
576 // prev stays the same.
577
578 CodeCache::release_exception_cache(curr);
579 } else {
580 prev = curr;
581 }
582
583 curr = next;
584 }
585 }
586
587 // public method for accessing the exception cache
588 // These are the public access methods.
589 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
590 // We never grab a lock to read the exception cache, so we may
591 // have false negatives. This is okay, as it can only happen during
592 // the first few exception lookups for a given nmethod.
593 ExceptionCache* ec = exception_cache_acquire();
594 while (ec != nullptr) {
595 address ret_val;
596 if ((ret_val = ec->match(exception,pc)) != nullptr) {
597 return ret_val;
598 }
599 ec = ec->next();
600 }
601 return nullptr;
602 }
603
604 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
605 // There are potential race conditions during exception cache updates, so we
606 // must own the ExceptionCache_lock before doing ANY modifications. Because
607 // we don't lock during reads, it is possible to have several threads attempt
608 // to update the cache with the same data. We need to check for already inserted
609 // copies of the current data before adding it.
610
611 MutexLocker ml(ExceptionCache_lock);
612 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
613
614 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
615 target_entry = new ExceptionCache(exception,pc,handler);
616 add_exception_cache_entry(target_entry);
617 }
618 }
619
620 // private method for handling exception cache
621 // These methods are private, and used to manipulate the exception cache
622 // directly.
623 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
624 ExceptionCache* ec = exception_cache_acquire();
625 while (ec != nullptr) {
626 if (ec->match_exception_with_space(exception)) {
627 return ec;
628 }
629 ec = ec->next();
630 }
631 return nullptr;
632 }
633
634 bool nmethod::is_at_poll_return(address pc) {
635 RelocIterator iter(this, pc, pc+1);
636 while (iter.next()) {
637 if (iter.type() == relocInfo::poll_return_type)
638 return true;
639 }
640 return false;
641 }
642
643
644 bool nmethod::is_at_poll_or_poll_return(address pc) {
645 RelocIterator iter(this, pc, pc+1);
646 while (iter.next()) {
647 relocInfo::relocType t = iter.type();
648 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
649 return true;
650 }
651 return false;
652 }
653
654 void nmethod::verify_oop_relocations() {
655 // Ensure sure that the code matches the current oop values
656 RelocIterator iter(this, nullptr, nullptr);
657 while (iter.next()) {
658 if (iter.type() == relocInfo::oop_type) {
659 oop_Relocation* reloc = iter.oop_reloc();
660 if (!reloc->oop_is_immediate()) {
661 reloc->verify_oop_relocation();
662 }
663 }
664 }
665 }
666
667
668 ScopeDesc* nmethod::scope_desc_at(address pc) {
669 PcDesc* pd = pc_desc_at(pc);
670 guarantee(pd != nullptr, "scope must be present");
671 return new ScopeDesc(this, pd);
672 }
673
674 ScopeDesc* nmethod::scope_desc_near(address pc) {
675 PcDesc* pd = pc_desc_near(pc);
676 guarantee(pd != nullptr, "scope must be present");
677 return new ScopeDesc(this, pd);
678 }
679
680 address nmethod::oops_reloc_begin() const {
681 // If the method is not entrant then a JMP is plastered over the
682 // first few bytes. If an oop in the old code was there, that oop
683 // should not get GC'd. Skip the first few bytes of oops on
684 // not-entrant methods.
685 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
686 code_begin() + frame_complete_offset() >
687 verified_entry_point() + NativeJump::instruction_size)
688 {
689 // If we have a frame_complete_offset after the native jump, then there
690 // is no point trying to look for oops before that. This is a requirement
691 // for being allowed to scan oops concurrently.
692 return code_begin() + frame_complete_offset();
693 }
694
695 address low_boundary = verified_entry_point();
696 if (!is_in_use()) {
697 low_boundary += NativeJump::instruction_size;
698 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
699 // This means that the low_boundary is going to be a little too high.
700 // This shouldn't matter, since oops of non-entrant methods are never used.
701 // In fact, why are we bothering to look at oops in a non-entrant method??
702 }
703 return low_boundary;
704 }
705
706 // Method that knows how to preserve outgoing arguments at call. This method must be
707 // called with a frame corresponding to a Java invoke
708 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
709 if (method() == nullptr) {
710 return;
711 }
712
713 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
714 JavaThread* thread = reg_map->thread();
715 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
716 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
717 return;
718 }
719
720 if (!method()->is_native()) {
721 address pc = fr.pc();
722 bool has_receiver, has_appendix;
723 Symbol* signature;
724
725 // The method attached by JIT-compilers should be used, if present.
726 // Bytecode can be inaccurate in such case.
727 Method* callee = attached_method_before_pc(pc);
728 if (callee != nullptr) {
729 has_receiver = !(callee->access_flags().is_static());
730 has_appendix = false;
731 signature = callee->signature();
732 } else {
733 SimpleScopeDesc ssd(this, pc);
734
735 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
736 has_receiver = call.has_receiver();
737 has_appendix = call.has_appendix();
738 signature = call.signature();
739 }
740
741 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
742 } else if (method()->is_continuation_enter_intrinsic()) {
743 // This method only calls Continuation.enter()
744 Symbol* signature = vmSymbols::continuationEnter_signature();
745 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
746 }
747 }
748
749 Method* nmethod::attached_method(address call_instr) {
750 assert(code_contains(call_instr), "not part of the nmethod");
751 RelocIterator iter(this, call_instr, call_instr + 1);
752 while (iter.next()) {
753 if (iter.addr() == call_instr) {
754 switch(iter.type()) {
755 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
756 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
757 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
758 default: break;
759 }
760 }
761 }
762 return nullptr; // not found
763 }
764
765 Method* nmethod::attached_method_before_pc(address pc) {
766 if (NativeCall::is_call_before(pc)) {
767 NativeCall* ncall = nativeCall_before(pc);
768 return attached_method(ncall->instruction_address());
769 }
770 return nullptr; // not a call
771 }
772
773 void nmethod::clear_inline_caches() {
774 assert(SafepointSynchronize::is_at_safepoint(), "clearing of IC's only allowed at safepoint");
775 RelocIterator iter(this);
776 while (iter.next()) {
777 iter.reloc()->clear_inline_cache();
778 }
779 }
780
781 #ifdef ASSERT
782 // Check class_loader is alive for this bit of metadata.
783 class CheckClass : public MetadataClosure {
784 void do_metadata(Metadata* md) {
785 Klass* klass = nullptr;
786 if (md->is_klass()) {
787 klass = ((Klass*)md);
788 } else if (md->is_method()) {
789 klass = ((Method*)md)->method_holder();
790 } else if (md->is_methodData()) {
791 klass = ((MethodData*)md)->method()->method_holder();
792 } else if (md->is_methodCounters()) {
793 klass = ((MethodCounters*)md)->method()->method_holder();
794 } else {
795 md->print();
796 ShouldNotReachHere();
797 }
798 assert(klass->is_loader_alive(), "must be alive");
799 }
800 };
801 #endif // ASSERT
802
803
804 static void clean_ic_if_metadata_is_dead(CompiledIC *ic) {
805 ic->clean_metadata();
806 }
807
808 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
809 template <typename CallsiteT>
810 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, nmethod* from,
811 bool clean_all) {
812 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
813 if (!cb->is_nmethod()) {
814 return;
815 }
816 nmethod* nm = cb->as_nmethod();
817 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
818 callsite->set_to_clean();
819 }
820 }
821
822 // Cleans caches in nmethods that point to either classes that are unloaded
823 // or nmethods that are unloaded.
824 //
825 // Can be called either in parallel by G1 currently or after all
826 // nmethods are unloaded. Return postponed=true in the parallel case for
827 // inline caches found that point to nmethods that are not yet visited during
828 // the do_unloading walk.
829 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
830 ResourceMark rm;
831
832 // Exception cache only needs to be called if unloading occurred
833 if (unloading_occurred) {
834 clean_exception_cache();
835 }
836
837 cleanup_inline_caches_impl(unloading_occurred, false);
838
839 #ifdef ASSERT
840 // Check that the metadata embedded in the nmethod is alive
841 CheckClass check_class;
842 metadata_do(&check_class);
843 #endif
844 }
845
846 void nmethod::run_nmethod_entry_barrier() {
847 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
848 if (bs_nm != nullptr) {
849 // We want to keep an invariant that nmethods found through iterations of a Thread's
850 // nmethods found in safepoints have gone through an entry barrier and are not armed.
851 // By calling this nmethod entry barrier, it plays along and acts
852 // like any other nmethod found on the stack of a thread (fewer surprises).
853 nmethod* nm = this;
854 bool alive = bs_nm->nmethod_entry_barrier(nm);
855 assert(alive, "should be alive");
856 }
857 }
858
859 // Only called by whitebox test
860 void nmethod::cleanup_inline_caches_whitebox() {
861 assert_locked_or_safepoint(CodeCache_lock);
862 CompiledICLocker ic_locker(this);
863 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
864 }
865
866 address* nmethod::orig_pc_addr(const frame* fr) {
867 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
868 }
869
870 // Called to clean up after class unloading for live nmethods
871 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
872 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
873 ResourceMark rm;
874
875 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
876 RelocIterator iter(this, oops_reloc_begin());
877 bool is_in_static_stub = false;
878 while(iter.next()) {
879
880 switch (iter.type()) {
881
882 case relocInfo::virtual_call_type:
883 if (unloading_occurred) {
884 // If class unloading occurred we first clear ICs where the cached metadata
885 // is referring to an unloaded klass or method.
886 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter));
887 }
888
889 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, clean_all);
890 break;
891
892 case relocInfo::opt_virtual_call_type:
893 case relocInfo::static_call_type:
894 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), this, clean_all);
895 break;
896
897 case relocInfo::static_stub_type: {
898 is_in_static_stub = true;
899 break;
900 }
901
902 case relocInfo::metadata_type: {
903 // Only the metadata relocations contained in static/opt virtual call stubs
904 // contains the Method* passed to c2i adapters. It is the only metadata
905 // relocation that needs to be walked, as it is the one metadata relocation
906 // that violates the invariant that all metadata relocations have an oop
907 // in the compiled method (due to deferred resolution and code patching).
908
909 // This causes dead metadata to remain in compiled methods that are not
910 // unloading. Unless these slippery metadata relocations of the static
911 // stubs are at least cleared, subsequent class redefinition operations
912 // will access potentially free memory, and JavaThread execution
913 // concurrent to class unloading may call c2i adapters with dead methods.
914 if (!is_in_static_stub) {
915 // The first metadata relocation after a static stub relocation is the
916 // metadata relocation of the static stub used to pass the Method* to
917 // c2i adapters.
918 continue;
919 }
920 is_in_static_stub = false;
921 if (is_unloading()) {
922 // If the nmethod itself is dying, then it may point at dead metadata.
923 // Nobody should follow that metadata; it is strictly unsafe.
924 continue;
925 }
926 metadata_Relocation* r = iter.metadata_reloc();
927 Metadata* md = r->metadata_value();
928 if (md != nullptr && md->is_method()) {
929 Method* method = static_cast<Method*>(md);
930 if (!method->method_holder()->is_loader_alive()) {
931 Atomic::store(r->metadata_addr(), (Method*)nullptr);
932
933 if (!r->metadata_is_immediate()) {
934 r->fix_metadata_relocation();
935 }
936 }
937 }
938 break;
939 }
940
941 default:
942 break;
943 }
944 }
945 }
946
947 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
948 // Exception happened outside inline-cache check code => we are inside
949 // an active nmethod => use cpc to determine a return address
950 int exception_offset = int(pc - code_begin());
951 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
952 #ifdef ASSERT
953 if (cont_offset == 0) {
954 Thread* thread = Thread::current();
955 ResourceMark rm(thread);
956 CodeBlob* cb = CodeCache::find_blob(pc);
957 assert(cb != nullptr && cb == this, "");
958
959 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
960 stringStream ss;
961 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
962 print_on(&ss);
963 method()->print_codes_on(&ss);
964 print_code_on(&ss);
965 print_pcs_on(&ss);
966 tty->print("%s", ss.as_string()); // print all at once
967 }
968 #endif
969 if (cont_offset == 0) {
970 // Let the normal error handling report the exception
971 return nullptr;
972 }
973 if (cont_offset == exception_offset) {
974 #if INCLUDE_JVMCI
975 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
976 JavaThread *thread = JavaThread::current();
977 thread->set_jvmci_implicit_exception_pc(pc);
978 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
979 Deoptimization::Action_reinterpret));
980 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
981 #else
982 ShouldNotReachHere();
983 #endif
984 }
985 return code_begin() + cont_offset;
986 }
987
988 class HasEvolDependency : public MetadataClosure {
989 bool _has_evol_dependency;
990 public:
991 HasEvolDependency() : _has_evol_dependency(false) {}
992 void do_metadata(Metadata* md) {
993 if (md->is_method()) {
994 Method* method = (Method*)md;
995 if (method->is_old()) {
996 _has_evol_dependency = true;
997 }
998 }
999 }
1000 bool has_evol_dependency() const { return _has_evol_dependency; }
1001 };
1002
1003 bool nmethod::has_evol_metadata() {
1004 // Check the metadata in relocIter and CompiledIC and also deoptimize
1005 // any nmethod that has reference to old methods.
1006 HasEvolDependency check_evol;
1007 metadata_do(&check_evol);
1008 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
1009 ResourceMark rm;
1010 log_debug(redefine, class, nmethod)
1011 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
1012 _method->method_holder()->external_name(),
1013 _method->name()->as_C_string(),
1014 _method->signature()->as_C_string(),
1015 compile_id());
1016 }
1017 return check_evol.has_evol_dependency();
1018 }
1019
1020 int nmethod::total_size() const {
1021 return
1022 consts_size() +
1023 insts_size() +
1024 stub_size() +
1025 scopes_data_size() +
1026 scopes_pcs_size() +
1027 handler_table_size() +
1028 nul_chk_table_size();
1029 }
1030
1031 const char* nmethod::compile_kind() const {
1032 if (is_osr_method()) return "osr";
1033 if (preloaded()) return "AP";
1034 if (is_aot()) return "A";
1035
1036 if (method() != nullptr && is_native_method()) {
1037 if (method()->is_continuation_native_intrinsic()) {
1038 return "cnt";
1039 }
1040 return "c2n";
1041 }
1042 return nullptr;
1043 }
1044
1045 const char* nmethod::compiler_name() const {
1046 return compilertype2name(_compiler_type);
1047 }
1048
1049 #ifdef ASSERT
1050 class CheckForOopsClosure : public OopClosure {
1051 bool _found_oop = false;
1052 public:
1053 virtual void do_oop(oop* o) { _found_oop = true; }
1054 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1055 bool found_oop() { return _found_oop; }
1056 };
1057 class CheckForMetadataClosure : public MetadataClosure {
1058 bool _found_metadata = false;
1059 Metadata* _ignore = nullptr;
1060 public:
1061 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1062 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1063 bool found_metadata() { return _found_metadata; }
1064 };
1065
1066 static void assert_no_oops_or_metadata(nmethod* nm) {
1067 if (nm == nullptr) return;
1068 assert(nm->oop_maps() == nullptr, "expectation");
1069
1070 CheckForOopsClosure cfo;
1071 nm->oops_do(&cfo);
1072 assert(!cfo.found_oop(), "no oops allowed");
1073
1074 // We allow an exception for the own Method, but require its class to be permanent.
1075 Method* own_method = nm->method();
1076 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1077 nm->metadata_do(&cfm);
1078 assert(!cfm.found_metadata(), "no metadata allowed");
1079
1080 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1081 "Method's class needs to be permanent");
1082 }
1083 #endif
1084
1085 static int required_mutable_data_size(CodeBuffer* code_buffer,
1086 int jvmci_data_size = 0) {
1087 return align_up(code_buffer->total_relocation_size(), oopSize) +
1088 align_up(code_buffer->total_metadata_size(), oopSize) +
1089 align_up(jvmci_data_size, oopSize);
1090 }
1091
1092 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1093 int compile_id,
1094 CodeBuffer *code_buffer,
1095 int vep_offset,
1096 int frame_complete,
1097 int frame_size,
1098 ByteSize basic_lock_owner_sp_offset,
1099 ByteSize basic_lock_sp_offset,
1100 OopMapSet* oop_maps,
1101 int exception_handler) {
1102 code_buffer->finalize_oop_references(method);
1103 // create nmethod
1104 nmethod* nm = nullptr;
1105 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1106 {
1107 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1108
1109 CodeOffsets offsets;
1110 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1111 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1112 if (exception_handler != -1) {
1113 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1114 }
1115
1116 int mutable_data_size = required_mutable_data_size(code_buffer);
1117
1118 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1119 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1120 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1121 nm = new (native_nmethod_size, allow_NonNMethod_space)
1122 nmethod(method(), compiler_none, native_nmethod_size,
1123 compile_id, &offsets,
1124 code_buffer, frame_size,
1125 basic_lock_owner_sp_offset,
1126 basic_lock_sp_offset,
1127 oop_maps, mutable_data_size);
1128 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1129 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1130 }
1131
1132 if (nm != nullptr) {
1133 // verify nmethod
1134 DEBUG_ONLY(nm->verify();) // might block
1135
1136 nm->log_new_nmethod();
1137 }
1138 return nm;
1139 }
1140
1141 void nmethod::record_nmethod_dependency() {
1142 // To make dependency checking during class loading fast, record
1143 // the nmethod dependencies in the classes it is dependent on.
1144 // This allows the dependency checking code to simply walk the
1145 // class hierarchy above the loaded class, checking only nmethods
1146 // which are dependent on those classes. The slow way is to
1147 // check every nmethod for dependencies which makes it linear in
1148 // the number of methods compiled. For applications with a lot
1149 // classes the slow way is too slow.
1150 for (Dependencies::DepStream deps(this); deps.next(); ) {
1151 if (deps.type() == Dependencies::call_site_target_value) {
1152 // CallSite dependencies are managed on per-CallSite instance basis.
1153 oop call_site = deps.argument_oop(0);
1154 MethodHandles::add_dependent_nmethod(call_site, this);
1155 } else {
1156 InstanceKlass* ik = deps.context_type();
1157 if (ik == nullptr) {
1158 continue; // ignore things like evol_method
1159 }
1160 // record this nmethod as dependent on this klass
1161 ik->add_dependent_nmethod(this);
1162 }
1163 }
1164 }
1165
1166 nmethod* nmethod::new_nmethod(const methodHandle& method,
1167 int compile_id,
1168 int entry_bci,
1169 CodeOffsets* offsets,
1170 int orig_pc_offset,
1171 DebugInformationRecorder* debug_info,
1172 Dependencies* dependencies,
1173 CodeBuffer* code_buffer, int frame_size,
1174 OopMapSet* oop_maps,
1175 ExceptionHandlerTable* handler_table,
1176 ImplicitExceptionTable* nul_chk_table,
1177 AbstractCompiler* compiler,
1178 CompLevel comp_level
1179 , AOTCodeEntry* aot_code_entry
1180 #if INCLUDE_JVMCI
1181 , char* speculations,
1182 int speculations_len,
1183 JVMCINMethodData* jvmci_data
1184 #endif
1185 )
1186 {
1187 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1188 code_buffer->finalize_oop_references(method);
1189 // create nmethod
1190 nmethod* nm = nullptr;
1191 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1192
1193 int immutable_data_size =
1194 adjust_pcs_size(debug_info->pcs_size())
1195 + align_up((int)dependencies->size_in_bytes(), oopSize)
1196 + align_up(handler_table->size_in_bytes() , oopSize)
1197 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1198 #if INCLUDE_JVMCI
1199 + align_up(speculations_len , oopSize)
1200 #endif
1201 + align_up(debug_info->data_size() , oopSize);
1202
1203 // First, allocate space for immutable data in C heap.
1204 address immutable_data = nullptr;
1205 if (immutable_data_size > 0) {
1206 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1207 if (immutable_data == nullptr) {
1208 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1209 return nullptr;
1210 }
1211 }
1212
1213 int mutable_data_size = required_mutable_data_size(code_buffer
1214 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1215
1216 {
1217 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1218
1219 nm = new (nmethod_size, comp_level)
1220 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1221 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1222 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1223 handler_table, nul_chk_table, compiler, comp_level, aot_code_entry
1224 #if INCLUDE_JVMCI
1225 , speculations,
1226 speculations_len,
1227 jvmci_data
1228 #endif
1229 );
1230
1231 if (nm != nullptr) {
1232 nm->record_nmethod_dependency();
1233 NOT_PRODUCT(note_java_nmethod(nm));
1234 }
1235 }
1236 // Do verification and logging outside CodeCache_lock.
1237 if (nm != nullptr) {
1238
1239 #ifdef ASSERT
1240 LogTarget(Debug, aot, codecache, nmethod) log;
1241 if (log.is_enabled()) {
1242 LogStream out(log);
1243 out.print_cr("== new_nmethod 2");
1244 FlagSetting fs(PrintRelocations, true);
1245 nm->print_on_impl(&out);
1246 nm->decode(&out);
1247 }
1248 #endif
1249
1250 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1251 DEBUG_ONLY(nm->verify();)
1252 nm->log_new_nmethod();
1253 }
1254 return nm;
1255 }
1256
1257 nmethod* nmethod::restore(address code_cache_buffer,
1258 const methodHandle& method,
1259 int compile_id,
1260 address reloc_data,
1261 GrowableArray<Handle>& oop_list,
1262 GrowableArray<Metadata*>& metadata_list,
1263 ImmutableOopMapSet* oop_maps,
1264 address immutable_data,
1265 GrowableArray<Handle>& reloc_imm_oop_list,
1266 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1267 AOTCodeReader* aot_code_reader)
1268 {
1269 CodeBlob::restore(code_cache_buffer, "nmethod", reloc_data, oop_maps);
1270 nmethod* nm = (nmethod*)code_cache_buffer;
1271 nm->set_method(method());
1272 nm->_compile_id = compile_id;
1273 nm->set_immutable_data(immutable_data);
1274 nm->copy_values(&oop_list);
1275 nm->copy_values(&metadata_list);
1276
1277 aot_code_reader->fix_relocations(nm, &reloc_imm_oop_list, &reloc_imm_metadata_list);
1278
1279 #ifndef PRODUCT
1280 nm->asm_remarks().init();
1281 aot_code_reader->read_asm_remarks(nm->asm_remarks(), /* use_string_table */ false);
1282 nm->dbg_strings().init();
1283 aot_code_reader->read_dbg_strings(nm->dbg_strings(), /* use_string_table */ false);
1284 #endif
1285
1286 // Flush the code block
1287 ICache::invalidate_range(nm->code_begin(), nm->code_size());
1288
1289 // Create cache after PcDesc data is copied - it will be used to initialize cache
1290 nm->_pc_desc_container = new PcDescContainer(nm->scopes_pcs_begin());
1291
1292 nm->set_aot_code_entry(aot_code_reader->aot_code_entry());
1293
1294 nm->post_init();
1295 return nm;
1296 }
1297
1298 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1299 const methodHandle& method,
1300 AbstractCompiler* compiler,
1301 int compile_id,
1302 address reloc_data,
1303 GrowableArray<Handle>& oop_list,
1304 GrowableArray<Metadata*>& metadata_list,
1305 ImmutableOopMapSet* oop_maps,
1306 address immutable_data,
1307 GrowableArray<Handle>& reloc_imm_oop_list,
1308 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1309 AOTCodeReader* aot_code_reader)
1310 {
1311 nmethod* nm = nullptr;
1312 int nmethod_size = archived_nm->size();
1313 // create nmethod
1314 {
1315 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1316 address code_cache_buffer = (address)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1317 if (code_cache_buffer != nullptr) {
1318 nm = archived_nm->restore(code_cache_buffer,
1319 method,
1320 compile_id,
1321 reloc_data,
1322 oop_list,
1323 metadata_list,
1324 oop_maps,
1325 immutable_data,
1326 reloc_imm_oop_list,
1327 reloc_imm_metadata_list,
1328 aot_code_reader);
1329 nm->record_nmethod_dependency();
1330 NOT_PRODUCT(note_java_nmethod(nm));
1331 }
1332 }
1333 // Do verification and logging outside CodeCache_lock.
1334 if (nm != nullptr) {
1335 #ifdef ASSERT
1336 LogTarget(Debug, aot, codecache, nmethod) log;
1337 if (log.is_enabled()) {
1338 LogStream out(log);
1339 out.print_cr("== new_nmethod 2");
1340 FlagSetting fs(PrintRelocations, true);
1341 nm->print_on_impl(&out);
1342 nm->decode(&out);
1343 }
1344 #endif
1345 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1346 DEBUG_ONLY(nm->verify();)
1347 nm->log_new_nmethod();
1348 }
1349 return nm;
1350 }
1351
1352 // Fill in default values for various fields
1353 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1354 // avoid uninitialized fields, even for short time periods
1355 _exception_cache = nullptr;
1356 _gc_data = nullptr;
1357 _oops_do_mark_link = nullptr;
1358 _compiled_ic_data = nullptr;
1359
1360 _is_unloading_state = 0;
1361 _state = not_installed;
1362
1363 _has_unsafe_access = 0;
1364 _has_method_handle_invokes = 0;
1365 _has_wide_vectors = 0;
1366 _has_monitors = 0;
1367 _has_scoped_access = 0;
1368 _has_flushed_dependencies = 0;
1369 _is_unlinked = 0;
1370 _load_reported = 0; // jvmti state
1371 _preloaded = 0;
1372 _has_clinit_barriers = 0;
1373
1374 _used = false;
1375 _deoptimization_status = not_marked;
1376
1377 // SECT_CONSTS is first in code buffer so the offset should be 0.
1378 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1379 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1380
1381 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1382
1383 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1384 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1385
1386 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1387 }
1388
1389 // Post initialization
1390 void nmethod::post_init() {
1391 clear_unloading_state();
1392
1393 finalize_relocations();
1394
1395 Universe::heap()->register_nmethod(this);
1396 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1397
1398 CodeCache::commit(this);
1399 }
1400
1401 // For native wrappers
1402 nmethod::nmethod(
1403 Method* method,
1404 CompilerType type,
1405 int nmethod_size,
1406 int compile_id,
1407 CodeOffsets* offsets,
1408 CodeBuffer* code_buffer,
1409 int frame_size,
1410 ByteSize basic_lock_owner_sp_offset,
1411 ByteSize basic_lock_sp_offset,
1412 OopMapSet* oop_maps,
1413 int mutable_data_size)
1414 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1415 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1416 _deoptimization_generation(0),
1417 _gc_epoch(CodeCache::gc_epoch()),
1418 _method(method),
1419 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1420 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1421 {
1422 {
1423 DEBUG_ONLY(NoSafepointVerifier nsv;)
1424 assert_locked_or_safepoint(CodeCache_lock);
1425
1426 init_defaults(code_buffer, offsets);
1427
1428 _osr_entry_point = nullptr;
1429 _pc_desc_container = nullptr;
1430 _entry_bci = InvocationEntryBci;
1431 _compile_id = compile_id;
1432 _comp_level = CompLevel_none;
1433 _compiler_type = type;
1434 _orig_pc_offset = 0;
1435 _num_stack_arg_slots = 0;
1436
1437 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1438 // Continuation enter intrinsic
1439 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1440 } else {
1441 _exception_offset = 0;
1442 }
1443 // Native wrappers do not have deopt handlers. Make the values
1444 // something that will never match a pc like the nmethod vtable entry
1445 _deopt_handler_offset = 0;
1446 _deopt_mh_handler_offset = 0;
1447 _aot_code_entry = nullptr;
1448 _method_profiling_count = 0;
1449 _unwind_handler_offset = 0;
1450
1451 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1452 uint16_t metadata_size;
1453 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1454 JVMCI_ONLY( _metadata_size = metadata_size; )
1455 assert(_mutable_data_size == _relocation_size + metadata_size,
1456 "wrong mutable data size: %d != %d + %d",
1457 _mutable_data_size, _relocation_size, metadata_size);
1458
1459 // native wrapper does not have read-only data but we need unique not null address
1460 _immutable_data = blob_end();
1461 _immutable_data_size = 0;
1462 _nul_chk_table_offset = 0;
1463 _handler_table_offset = 0;
1464 _scopes_pcs_offset = 0;
1465 _scopes_data_offset = 0;
1466 #if INCLUDE_JVMCI
1467 _speculations_offset = 0;
1468 #endif
1469
1470 code_buffer->copy_code_and_locs_to(this);
1471 code_buffer->copy_values_to(this);
1472
1473 post_init();
1474 }
1475
1476 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1477 ttyLocker ttyl; // keep the following output all in one block
1478 // This output goes directly to the tty, not the compiler log.
1479 // To enable tools to match it up with the compilation activity,
1480 // be sure to tag this tty output with the compile ID.
1481 if (xtty != nullptr) {
1482 xtty->begin_head("print_native_nmethod");
1483 xtty->method(_method);
1484 xtty->stamp();
1485 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1486 }
1487 // Print the header part, then print the requested information.
1488 // This is both handled in decode2(), called via print_code() -> decode()
1489 if (PrintNativeNMethods) {
1490 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1491 print_code();
1492 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1493 #if defined(SUPPORT_DATA_STRUCTS)
1494 if (AbstractDisassembler::show_structs()) {
1495 if (oop_maps != nullptr) {
1496 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1497 oop_maps->print_on(tty);
1498 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1499 }
1500 }
1501 #endif
1502 } else {
1503 print(); // print the header part only.
1504 }
1505 #if defined(SUPPORT_DATA_STRUCTS)
1506 if (AbstractDisassembler::show_structs()) {
1507 if (PrintRelocations) {
1508 print_relocations_on(tty);
1509 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1510 }
1511 }
1512 #endif
1513 if (xtty != nullptr) {
1514 xtty->tail("print_native_nmethod");
1515 }
1516 }
1517 }
1518
1519 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1520 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1521 }
1522
1523 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1524 // Try MethodNonProfiled and MethodProfiled.
1525 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1526 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1527 // Try NonNMethod or give up.
1528 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1529 }
1530
1531 // For normal JIT compiled code
1532 nmethod::nmethod(
1533 Method* method,
1534 CompilerType type,
1535 int nmethod_size,
1536 int immutable_data_size,
1537 int mutable_data_size,
1538 int compile_id,
1539 int entry_bci,
1540 address immutable_data,
1541 CodeOffsets* offsets,
1542 int orig_pc_offset,
1543 DebugInformationRecorder* debug_info,
1544 Dependencies* dependencies,
1545 CodeBuffer *code_buffer,
1546 int frame_size,
1547 OopMapSet* oop_maps,
1548 ExceptionHandlerTable* handler_table,
1549 ImplicitExceptionTable* nul_chk_table,
1550 AbstractCompiler* compiler,
1551 CompLevel comp_level
1552 , AOTCodeEntry* aot_code_entry
1553 #if INCLUDE_JVMCI
1554 , char* speculations,
1555 int speculations_len,
1556 JVMCINMethodData* jvmci_data
1557 #endif
1558 )
1559 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1560 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1561 _deoptimization_generation(0),
1562 _gc_epoch(CodeCache::gc_epoch()),
1563 _method(method),
1564 _osr_link(nullptr)
1565 {
1566 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1567 {
1568 DEBUG_ONLY(NoSafepointVerifier nsv;)
1569 assert_locked_or_safepoint(CodeCache_lock);
1570
1571 init_defaults(code_buffer, offsets);
1572 _aot_code_entry = aot_code_entry;
1573 _method_profiling_count = 0;
1574
1575 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1576 _entry_bci = entry_bci;
1577 _compile_id = compile_id;
1578 _comp_level = comp_level;
1579 _compiler_type = type;
1580 _orig_pc_offset = orig_pc_offset;
1581
1582 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1583
1584 set_ctable_begin(header_begin() + content_offset());
1585
1586 #if INCLUDE_JVMCI
1587 if (compiler->is_jvmci()) {
1588 // JVMCI might not produce any stub sections
1589 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1590 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1591 } else {
1592 _exception_offset = -1;
1593 }
1594 if (offsets->value(CodeOffsets::Deopt) != -1) {
1595 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1596 } else {
1597 _deopt_handler_offset = -1;
1598 }
1599 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1600 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
1601 } else {
1602 _deopt_mh_handler_offset = -1;
1603 }
1604 } else
1605 #endif
1606 {
1607 // Exception handler and deopt handler are in the stub section
1608 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1609 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1610
1611 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1612 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1613 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1614 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
1615 } else {
1616 _deopt_mh_handler_offset = -1;
1617 }
1618 }
1619 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1620 // C1 generates UnwindHandler at the end of instructions section.
1621 // Calculate positive offset as distance between the start of stubs section
1622 // (which is also the end of instructions section) and the start of the handler.
1623 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1624 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1625 } else {
1626 _unwind_handler_offset = -1;
1627 }
1628
1629 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1630 uint16_t metadata_size;
1631 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1632 JVMCI_ONLY( _metadata_size = metadata_size; )
1633 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1634 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1635 "wrong mutable data size: %d != %d + %d + %d",
1636 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1637 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1638 nmethod_size, (int)(code_end() - header_begin()));
1639
1640 _immutable_data_size = immutable_data_size;
1641 if (immutable_data_size > 0) {
1642 assert(immutable_data != nullptr, "required");
1643 _immutable_data = immutable_data;
1644 } else {
1645 // We need unique not null address
1646 _immutable_data = blob_end();
1647 }
1648 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1649 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1650 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1651 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1652
1653 #if INCLUDE_JVMCI
1654 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1655 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); )
1656 #else
1657 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); )
1658 #endif
1659 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1660 immutable_data_end_offset, immutable_data_size);
1661
1662 // Copy code and relocation info
1663 code_buffer->copy_code_and_locs_to(this);
1664 // Copy oops and metadata
1665 code_buffer->copy_values_to(this);
1666 dependencies->copy_to(this);
1667 // Copy PcDesc and ScopeDesc data
1668 debug_info->copy_to(this);
1669
1670 // Create cache after PcDesc data is copied - it will be used to initialize cache
1671 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1672
1673 #if INCLUDE_JVMCI
1674 if (compiler->is_jvmci()) {
1675 // Initialize the JVMCINMethodData object inlined into nm
1676 jvmci_nmethod_data()->copy(jvmci_data);
1677 }
1678 #endif
1679
1680 // Copy contents of ExceptionHandlerTable to nmethod
1681 handler_table->copy_to(this);
1682 nul_chk_table->copy_to(this);
1683
1684 #if INCLUDE_JVMCI
1685 // Copy speculations to nmethod
1686 if (speculations_size() != 0) {
1687 memcpy(speculations_begin(), speculations, speculations_len);
1688 }
1689 #endif
1690
1691 post_init();
1692
1693 // we use the information of entry points to find out if a method is
1694 // static or non static
1695 assert(compiler->is_c2() || compiler->is_jvmci() ||
1696 _method->is_static() == (entry_point() == verified_entry_point()),
1697 " entry points must be same for static methods and vice versa");
1698 }
1699 }
1700
1701 // Print a short set of xml attributes to identify this nmethod. The
1702 // output should be embedded in some other element.
1703 void nmethod::log_identity(xmlStream* log) const {
1704 assert(log->inside_attrs_or_error(), "printing attributes");
1705 log->print(" compile_id='%d'", compile_id());
1706 const char* nm_kind = compile_kind();
1707 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1708 log->print(" compiler='%s'", compiler_name());
1709 if (TieredCompilation) {
1710 log->print(" compile_level='%d'", comp_level());
1711 }
1712 #if INCLUDE_JVMCI
1713 if (jvmci_nmethod_data() != nullptr) {
1714 const char* jvmci_name = jvmci_nmethod_data()->name();
1715 if (jvmci_name != nullptr) {
1716 log->print(" jvmci_mirror_name='");
1717 log->text("%s", jvmci_name);
1718 log->print("'");
1719 }
1720 }
1721 #endif
1722 }
1723
1724
1725 #define LOG_OFFSET(log, name) \
1726 if (p2i(name##_end()) - p2i(name##_begin())) \
1727 log->print(" " XSTR(name) "_offset='%zd'" , \
1728 p2i(name##_begin()) - p2i(this))
1729
1730
1731 void nmethod::log_new_nmethod() const {
1732 if (LogCompilation && xtty != nullptr) {
1733 ttyLocker ttyl;
1734 xtty->begin_elem("nmethod");
1735 log_identity(xtty);
1736 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1737 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1738
1739 LOG_OFFSET(xtty, relocation);
1740 LOG_OFFSET(xtty, consts);
1741 LOG_OFFSET(xtty, insts);
1742 LOG_OFFSET(xtty, stub);
1743 LOG_OFFSET(xtty, scopes_data);
1744 LOG_OFFSET(xtty, scopes_pcs);
1745 LOG_OFFSET(xtty, dependencies);
1746 LOG_OFFSET(xtty, handler_table);
1747 LOG_OFFSET(xtty, nul_chk_table);
1748 LOG_OFFSET(xtty, oops);
1749 LOG_OFFSET(xtty, metadata);
1750
1751 xtty->method(method());
1752 xtty->stamp();
1753 xtty->end_elem();
1754 }
1755 }
1756
1757 #undef LOG_OFFSET
1758
1759
1760 // Print out more verbose output usually for a newly created nmethod.
1761 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1762 if (st != nullptr) {
1763 ttyLocker ttyl;
1764 if (WizardMode) {
1765 CompileTask::print(st, this, msg, /*short_form:*/ true);
1766 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1767 } else {
1768 CompileTask::print(st, this, msg, /*short_form:*/ false);
1769 }
1770 }
1771 }
1772
1773 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1774 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1775 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1776 print_nmethod(printnmethods);
1777 }
1778 }
1779
1780 void nmethod::print_nmethod(bool printmethod) {
1781 // Enter a critical section to prevent a race with deopts that patch code and updates the relocation info.
1782 // Unfortunately, we have to lock the NMethodState_lock before the tty lock due to the deadlock rules and
1783 // cannot lock in a more finely grained manner.
1784 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1785 ttyLocker ttyl; // keep the following output all in one block
1786 if (xtty != nullptr) {
1787 xtty->begin_head("print_nmethod");
1788 log_identity(xtty);
1789 xtty->stamp();
1790 xtty->end_head();
1791 }
1792 // Print the header part, then print the requested information.
1793 // This is both handled in decode2().
1794 if (printmethod) {
1795 ResourceMark m;
1796 if (is_compiled_by_c1()) {
1797 tty->cr();
1798 tty->print_cr("============================= C1-compiled nmethod ==============================");
1799 }
1800 if (is_compiled_by_jvmci()) {
1801 tty->cr();
1802 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1803 }
1804 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1805 decode2(tty);
1806 #if defined(SUPPORT_DATA_STRUCTS)
1807 if (AbstractDisassembler::show_structs()) {
1808 // Print the oops from the underlying CodeBlob as well.
1809 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1810 print_oops(tty);
1811 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1812 print_metadata(tty);
1813 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1814 print_pcs_on(tty);
1815 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1816 if (oop_maps() != nullptr) {
1817 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1818 oop_maps()->print_on(tty);
1819 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1820 }
1821 }
1822 #endif
1823 } else {
1824 print(); // print the header part only.
1825 }
1826
1827 #if defined(SUPPORT_DATA_STRUCTS)
1828 if (AbstractDisassembler::show_structs()) {
1829 methodHandle mh(Thread::current(), _method);
1830 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1831 print_scopes();
1832 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1833 }
1834 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1835 print_relocations_on(tty);
1836 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1837 }
1838 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1839 print_dependencies_on(tty);
1840 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1841 }
1842 if (printmethod || PrintExceptionHandlers) {
1843 print_handler_table();
1844 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1845 print_nul_chk_table();
1846 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1847 }
1848
1849 if (printmethod) {
1850 print_recorded_oops();
1851 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1852 print_recorded_metadata();
1853 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1854 }
1855 }
1856 #endif
1857
1858 if (xtty != nullptr) {
1859 xtty->tail("print_nmethod");
1860 }
1861 }
1862
1863
1864 // Promote one word from an assembly-time handle to a live embedded oop.
1865 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1866 if (handle == nullptr ||
1867 // As a special case, IC oops are initialized to 1 or -1.
1868 handle == (jobject) Universe::non_oop_word()) {
1869 *(void**)dest = handle;
1870 } else {
1871 *dest = JNIHandles::resolve_non_null(handle);
1872 }
1873 }
1874
1875 void nmethod::copy_values(GrowableArray<Handle>* array) {
1876 int length = array->length();
1877 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1878 oop* dest = oops_begin();
1879 for (int index = 0 ; index < length; index++) {
1880 dest[index] = array->at(index)();
1881 }
1882 }
1883
1884 // Have to have the same name because it's called by a template
1885 void nmethod::copy_values(GrowableArray<jobject>* array) {
1886 int length = array->length();
1887 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1888 oop* dest = oops_begin();
1889 for (int index = 0 ; index < length; index++) {
1890 initialize_immediate_oop(&dest[index], array->at(index));
1891 }
1892
1893 // Now we can fix up all the oops in the code. We need to do this
1894 // in the code because the assembler uses jobjects as placeholders.
1895 // The code and relocations have already been initialized by the
1896 // CodeBlob constructor, so it is valid even at this early point to
1897 // iterate over relocations and patch the code.
1898 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1899 }
1900
1901 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1902 int length = array->length();
1903 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1904 Metadata** dest = metadata_begin();
1905 for (int index = 0 ; index < length; index++) {
1906 dest[index] = array->at(index);
1907 }
1908 }
1909
1910 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1911 // re-patch all oop-bearing instructions, just in case some oops moved
1912 RelocIterator iter(this, begin, end);
1913 while (iter.next()) {
1914 if (iter.type() == relocInfo::oop_type) {
1915 oop_Relocation* reloc = iter.oop_reloc();
1916 if (initialize_immediates && reloc->oop_is_immediate()) {
1917 oop* dest = reloc->oop_addr();
1918 jobject obj = *reinterpret_cast<jobject*>(dest);
1919 initialize_immediate_oop(dest, obj);
1920 }
1921 // Refresh the oop-related bits of this instruction.
1922 reloc->fix_oop_relocation();
1923 } else if (iter.type() == relocInfo::metadata_type) {
1924 metadata_Relocation* reloc = iter.metadata_reloc();
1925 reloc->fix_metadata_relocation();
1926 }
1927 }
1928 }
1929
1930 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
1931 RelocIterator iter(this);
1932 while (iter.next()) {
1933 if (iter.type() == relocInfo::oop_type) {
1934 oop_Relocation* reloc = iter.oop_reloc();
1935 if (reloc->oop_is_immediate()) {
1936 oop dest = reloc->oop_value();
1937 Handle h(thread, dest);
1938 oop_list.append(h);
1939 }
1940 } else if (iter.type() == relocInfo::metadata_type) {
1941 metadata_Relocation* reloc = iter.metadata_reloc();
1942 if (reloc->metadata_is_immediate()) {
1943 Metadata* m = reloc->metadata_value();
1944 metadata_list.append(m);
1945 }
1946 }
1947 }
1948 }
1949
1950 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1951 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1952 intptr_t cbaddr = (intptr_t) nm;
1953 intptr_t offset = ((intptr_t) pc) - cbaddr;
1954
1955 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1956 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1957 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1958 } else if (!nop->patch(oopmap_slot, offset)) {
1959 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1960 }
1961 }
1962
1963 void nmethod::finalize_relocations() {
1964 NoSafepointVerifier nsv;
1965
1966 GrowableArray<NativeMovConstReg*> virtual_call_data;
1967
1968 // Make sure that post call nops fill in nmethod offsets eagerly so
1969 // we don't have to race with deoptimization
1970 RelocIterator iter(this);
1971 while (iter.next()) {
1972 if (iter.type() == relocInfo::virtual_call_type) {
1973 virtual_call_Relocation* r = iter.virtual_call_reloc();
1974 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1975 virtual_call_data.append(value);
1976 } else if (iter.type() == relocInfo::post_call_nop_type) {
1977 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1978 address pc = reloc->addr();
1979 install_post_call_nop_displacement(this, pc);
1980 }
1981 }
1982
1983 if (virtual_call_data.length() > 0) {
1984 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
1985 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
1986 CompiledICData* next_data = _compiled_ic_data;
1987
1988 for (NativeMovConstReg* value : virtual_call_data) {
1989 value->set_data((intptr_t)next_data);
1990 next_data++;
1991 }
1992 }
1993 }
1994
1995 void nmethod::make_deoptimized() {
1996 if (!Continuations::enabled()) {
1997 // Don't deopt this again.
1998 set_deoptimized_done();
1999 return;
2000 }
2001
2002 assert(method() == nullptr || can_be_deoptimized(), "");
2003
2004 CompiledICLocker ml(this);
2005 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2006
2007 // If post call nops have been already patched, we can just bail-out.
2008 if (has_been_deoptimized()) {
2009 return;
2010 }
2011
2012 ResourceMark rm;
2013 RelocIterator iter(this, oops_reloc_begin());
2014
2015 while (iter.next()) {
2016
2017 switch (iter.type()) {
2018 case relocInfo::virtual_call_type: {
2019 CompiledIC *ic = CompiledIC_at(&iter);
2020 address pc = ic->end_of_call();
2021 NativePostCallNop* nop = nativePostCallNop_at(pc);
2022 if (nop != nullptr) {
2023 nop->make_deopt();
2024 }
2025 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2026 break;
2027 }
2028 case relocInfo::static_call_type:
2029 case relocInfo::opt_virtual_call_type: {
2030 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2031 address pc = csc->end_of_call();
2032 NativePostCallNop* nop = nativePostCallNop_at(pc);
2033 //tty->print_cr(" - static pc %p", pc);
2034 if (nop != nullptr) {
2035 nop->make_deopt();
2036 }
2037 // We can't assert here, there are some calls to stubs / runtime
2038 // that have reloc data and doesn't have a post call NOP.
2039 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2040 break;
2041 }
2042 default:
2043 break;
2044 }
2045 }
2046 // Don't deopt this again.
2047 set_deoptimized_done();
2048 }
2049
2050 void nmethod::verify_clean_inline_caches() {
2051 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2052
2053 ResourceMark rm;
2054 RelocIterator iter(this, oops_reloc_begin());
2055 while(iter.next()) {
2056 switch(iter.type()) {
2057 case relocInfo::virtual_call_type: {
2058 CompiledIC *ic = CompiledIC_at(&iter);
2059 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2060 assert(cb != nullptr, "destination not in CodeBlob?");
2061 nmethod* nm = cb->as_nmethod_or_null();
2062 if (nm != nullptr) {
2063 // Verify that inline caches pointing to bad nmethods are clean
2064 if (!nm->is_in_use() || nm->is_unloading()) {
2065 assert(ic->is_clean(), "IC should be clean");
2066 }
2067 }
2068 break;
2069 }
2070 case relocInfo::static_call_type:
2071 case relocInfo::opt_virtual_call_type: {
2072 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2073 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2074 assert(cb != nullptr, "destination not in CodeBlob?");
2075 nmethod* nm = cb->as_nmethod_or_null();
2076 if (nm != nullptr) {
2077 // Verify that inline caches pointing to bad nmethods are clean
2078 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2079 assert(cdc->is_clean(), "IC should be clean");
2080 }
2081 }
2082 break;
2083 }
2084 default:
2085 break;
2086 }
2087 }
2088 }
2089
2090 void nmethod::mark_as_maybe_on_stack() {
2091 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
2092 }
2093
2094 bool nmethod::is_maybe_on_stack() {
2095 // If the condition below is true, it means that the nmethod was found to
2096 // be alive the previous completed marking cycle.
2097 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2098 }
2099
2100 void nmethod::inc_decompile_count() {
2101 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2102 // Could be gated by ProfileTraps, but do not bother...
2103 Method* m = method();
2104 if (m == nullptr) return;
2105 MethodData* mdo = m->method_data();
2106 if (mdo == nullptr) return;
2107 // There is a benign race here. See comments in methodData.hpp.
2108 mdo->inc_decompile_count();
2109 }
2110
2111 void nmethod::inc_method_profiling_count() {
2112 Atomic::inc(&_method_profiling_count);
2113 }
2114
2115 uint64_t nmethod::method_profiling_count() {
2116 return _method_profiling_count;
2117 }
2118
2119 bool nmethod::try_transition(signed char new_state_int) {
2120 signed char new_state = new_state_int;
2121 assert_lock_strong(NMethodState_lock);
2122 signed char old_state = _state;
2123 if (old_state >= new_state) {
2124 // Ensure monotonicity of transitions.
2125 return false;
2126 }
2127 Atomic::store(&_state, new_state);
2128 return true;
2129 }
2130
2131 void nmethod::invalidate_osr_method() {
2132 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2133 // Remove from list of active nmethods
2134 if (method() != nullptr) {
2135 method()->method_holder()->remove_osr_nmethod(this);
2136 }
2137 }
2138
2139 void nmethod::log_state_change(const char* reason) const {
2140 assert(reason != nullptr, "Must provide a reason");
2141
2142 if (LogCompilation) {
2143 if (xtty != nullptr) {
2144 ttyLocker ttyl; // keep the following output all in one block
2145 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2146 os::current_thread_id(), reason);
2147 log_identity(xtty);
2148 xtty->stamp();
2149 xtty->end_elem();
2150 }
2151 }
2152
2153 ResourceMark rm;
2154 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2155 ss.print("made not entrant: %s", reason);
2156
2157 CompileTask::print_ul(this, ss.freeze());
2158 if (PrintCompilation) {
2159 print_on_with_msg(tty, ss.freeze());
2160 }
2161 }
2162
2163 void nmethod::unlink_from_method() {
2164 if (method() != nullptr) {
2165 method()->unlink_code(this);
2166 }
2167 }
2168
2169 // Invalidate code
2170 bool nmethod::make_not_entrant(const char* reason, bool keep_aot_entry) {
2171 assert(reason != nullptr, "Must provide a reason");
2172
2173 // This can be called while the system is already at a safepoint which is ok
2174 NoSafepointVerifier nsv;
2175
2176 if (is_unloading()) {
2177 // If the nmethod is unloading, then it is already not entrant through
2178 // the nmethod entry barriers. No need to do anything; GC will unload it.
2179 return false;
2180 }
2181
2182 if (Atomic::load(&_state) == not_entrant) {
2183 // Avoid taking the lock if already in required state.
2184 // This is safe from races because the state is an end-state,
2185 // which the nmethod cannot back out of once entered.
2186 // No need for fencing either.
2187 return false;
2188 }
2189
2190 {
2191 // Enter critical section. Does not block for safepoint.
2192 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2193
2194 if (Atomic::load(&_state) == not_entrant) {
2195 // another thread already performed this transition so nothing
2196 // to do, but return false to indicate this.
2197 return false;
2198 }
2199
2200 if (is_osr_method()) {
2201 // This logic is equivalent to the logic below for patching the
2202 // verified entry point of regular methods.
2203 // this effectively makes the osr nmethod not entrant
2204 invalidate_osr_method();
2205 } else {
2206 // The caller can be calling the method statically or through an inline
2207 // cache call.
2208 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
2209 SharedRuntime::get_handle_wrong_method_stub());
2210
2211 // Update the relocation info for the patched entry.
2212 // First, get the old relocation info...
2213 RelocIterator iter(this, verified_entry_point(), verified_entry_point() + 8);
2214 if (iter.next() && iter.addr() == verified_entry_point()) {
2215 Relocation* old_reloc = iter.reloc();
2216 // ...then reset the iterator to update it.
2217 RelocIterator iter(this, verified_entry_point(), verified_entry_point() + 8);
2218 relocInfo::change_reloc_info_for_address(&iter, verified_entry_point(), old_reloc->type(),
2219 relocInfo::relocType::runtime_call_type);
2220 }
2221 }
2222
2223 if (update_recompile_counts()) {
2224 // Mark the method as decompiled.
2225 inc_decompile_count();
2226 }
2227
2228 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2229 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2230 // If nmethod entry barriers are not supported, we won't mark
2231 // nmethods as on-stack when they become on-stack. So we
2232 // degrade to a less accurate flushing strategy, for now.
2233 mark_as_maybe_on_stack();
2234 }
2235
2236 // Change state
2237 bool success = try_transition(not_entrant);
2238 assert(success, "Transition can't fail");
2239
2240 // Log the transition once
2241 log_state_change(reason);
2242
2243 // Remove nmethod from method.
2244 unlink_from_method();
2245
2246 if (!keep_aot_entry) {
2247 // Keep AOT code if it was simply replaced
2248 // otherwise make it not entrant too.
2249 AOTCodeCache::invalidate(_aot_code_entry);
2250 }
2251
2252 CompileBroker::log_not_entrant(this);
2253 } // leave critical region under NMethodState_lock
2254
2255 #if INCLUDE_JVMCI
2256 // Invalidate can't occur while holding the NMethodState_lock
2257 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2258 if (nmethod_data != nullptr) {
2259 nmethod_data->invalidate_nmethod_mirror(this);
2260 }
2261 #endif
2262
2263 #ifdef ASSERT
2264 if (is_osr_method() && method() != nullptr) {
2265 // Make sure osr nmethod is invalidated, i.e. not on the list
2266 bool found = method()->method_holder()->remove_osr_nmethod(this);
2267 assert(!found, "osr nmethod should have been invalidated");
2268 }
2269 #endif
2270
2271 return true;
2272 }
2273
2274 // For concurrent GCs, there must be a handshake between unlink and flush
2275 void nmethod::unlink() {
2276 if (is_unlinked()) {
2277 // Already unlinked.
2278 return;
2279 }
2280
2281 flush_dependencies();
2282
2283 // unlink_from_method will take the NMethodState_lock.
2284 // In this case we don't strictly need it when unlinking nmethods from
2285 // the Method, because it is only concurrently unlinked by
2286 // the entry barrier, which acquires the per nmethod lock.
2287 unlink_from_method();
2288
2289 if (is_osr_method()) {
2290 invalidate_osr_method();
2291 }
2292
2293 #if INCLUDE_JVMCI
2294 // Clear the link between this nmethod and a HotSpotNmethod mirror
2295 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2296 if (nmethod_data != nullptr) {
2297 nmethod_data->invalidate_nmethod_mirror(this);
2298 }
2299 #endif
2300
2301 // Post before flushing as jmethodID is being used
2302 post_compiled_method_unload();
2303
2304 // Register for flushing when it is safe. For concurrent class unloading,
2305 // that would be after the unloading handshake, and for STW class unloading
2306 // that would be when getting back to the VM thread.
2307 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2308 }
2309
2310 void nmethod::purge(bool unregister_nmethod) {
2311
2312 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2313
2314 // completely deallocate this method
2315 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, compile_kind(), p2i(this));
2316 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
2317 "/Free CodeCache:%zuKb",
2318 compile_kind(), _compile_id, p2i(this), CodeCache::blob_count(),
2319 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
2320
2321 // We need to deallocate any ExceptionCache data.
2322 // Note that we do not need to grab the nmethod lock for this, it
2323 // better be thread safe if we're disposing of it!
2324 ExceptionCache* ec = exception_cache();
2325 while(ec != nullptr) {
2326 ExceptionCache* next = ec->next();
2327 delete ec;
2328 ec = next;
2329 }
2330 if (_pc_desc_container != nullptr) {
2331 delete _pc_desc_container;
2332 }
2333 if (_compiled_ic_data != nullptr) {
2334 delete[] _compiled_ic_data;
2335 }
2336
2337 if (_immutable_data != data_end() && !AOTCodeCache::is_address_in_aot_cache((address)_oop_maps)) {
2338 os::free(_immutable_data);
2339 _immutable_data = blob_end(); // Valid not null address
2340 }
2341 if (unregister_nmethod) {
2342 Universe::heap()->unregister_nmethod(this);
2343 }
2344 CodeCache::unregister_old_nmethod(this);
2345
2346 CodeBlob::purge();
2347 }
2348
2349 oop nmethod::oop_at(int index) const {
2350 if (index == 0) {
2351 return nullptr;
2352 }
2353
2354 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2355 return bs_nm->oop_load_no_keepalive(this, index);
2356 }
2357
2358 oop nmethod::oop_at_phantom(int index) const {
2359 if (index == 0) {
2360 return nullptr;
2361 }
2362
2363 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2364 return bs_nm->oop_load_phantom(this, index);
2365 }
2366
2367 //
2368 // Notify all classes this nmethod is dependent on that it is no
2369 // longer dependent.
2370
2371 void nmethod::flush_dependencies() {
2372 if (!has_flushed_dependencies()) {
2373 set_has_flushed_dependencies(true);
2374 for (Dependencies::DepStream deps(this); deps.next(); ) {
2375 if (deps.type() == Dependencies::call_site_target_value) {
2376 // CallSite dependencies are managed on per-CallSite instance basis.
2377 oop call_site = deps.argument_oop(0);
2378 MethodHandles::clean_dependency_context(call_site);
2379 } else {
2380 InstanceKlass* ik = deps.context_type();
2381 if (ik == nullptr) {
2382 continue; // ignore things like evol_method
2383 }
2384 // During GC liveness of dependee determines class that needs to be updated.
2385 // The GC may clean dependency contexts concurrently and in parallel.
2386 ik->clean_dependency_context();
2387 }
2388 }
2389 }
2390 }
2391
2392 void nmethod::post_compiled_method(CompileTask* task) {
2393 task->mark_success();
2394 task->set_nm_content_size(content_size());
2395 task->set_nm_insts_size(insts_size());
2396 task->set_nm_total_size(total_size());
2397
2398 // task->is_aot_load() is true only for loaded AOT code.
2399 // nmethod::_aot_code_entry is set for loaded and stored AOT code
2400 // to invalidate the entry when nmethod is deoptimized.
2401 // VerifyAOTCode is option to not store in archive AOT code.
2402 guarantee((_aot_code_entry != nullptr) || !task->is_aot_load() || VerifyAOTCode, "sanity");
2403
2404 // JVMTI -- compiled method notification (must be done outside lock)
2405 post_compiled_method_load_event();
2406
2407 if (CompilationLog::log() != nullptr) {
2408 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2409 }
2410
2411 const DirectiveSet* directive = task->directive();
2412 maybe_print_nmethod(directive);
2413 }
2414
2415 // ------------------------------------------------------------------
2416 // post_compiled_method_load_event
2417 // new method for install_code() path
2418 // Transfer information from compilation to jvmti
2419 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2420 // This is a bad time for a safepoint. We don't want
2421 // this nmethod to get unloaded while we're queueing the event.
2422 NoSafepointVerifier nsv;
2423
2424 Method* m = method();
2425 HOTSPOT_COMPILED_METHOD_LOAD(
2426 (char *) m->klass_name()->bytes(),
2427 m->klass_name()->utf8_length(),
2428 (char *) m->name()->bytes(),
2429 m->name()->utf8_length(),
2430 (char *) m->signature()->bytes(),
2431 m->signature()->utf8_length(),
2432 insts_begin(), insts_size());
2433
2434
2435 if (JvmtiExport::should_post_compiled_method_load()) {
2436 // Only post unload events if load events are found.
2437 set_load_reported();
2438 // If a JavaThread hasn't been passed in, let the Service thread
2439 // (which is a real Java thread) post the event
2440 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2441 if (state == nullptr) {
2442 // Execute any barrier code for this nmethod as if it's called, since
2443 // keeping it alive looks like stack walking.
2444 run_nmethod_entry_barrier();
2445 ServiceThread::enqueue_deferred_event(&event);
2446 } else {
2447 // This enters the nmethod barrier outside in the caller.
2448 state->enqueue_event(&event);
2449 }
2450 }
2451 }
2452
2453 void nmethod::post_compiled_method_unload() {
2454 assert(_method != nullptr, "just checking");
2455 DTRACE_METHOD_UNLOAD_PROBE(method());
2456
2457 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2458 // post the event. The Method* will not be valid when this is freed.
2459
2460 // Don't bother posting the unload if the load event wasn't posted.
2461 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2462 JvmtiDeferredEvent event =
2463 JvmtiDeferredEvent::compiled_method_unload_event(
2464 method()->jmethod_id(), insts_begin());
2465 ServiceThread::enqueue_deferred_event(&event);
2466 }
2467 }
2468
2469 // Iterate over metadata calling this function. Used by RedefineClasses
2470 void nmethod::metadata_do(MetadataClosure* f) {
2471 {
2472 // Visit all immediate references that are embedded in the instruction stream.
2473 RelocIterator iter(this, oops_reloc_begin());
2474 while (iter.next()) {
2475 if (iter.type() == relocInfo::metadata_type) {
2476 metadata_Relocation* r = iter.metadata_reloc();
2477 // In this metadata, we must only follow those metadatas directly embedded in
2478 // the code. Other metadatas (oop_index>0) are seen as part of
2479 // the metadata section below.
2480 assert(1 == (r->metadata_is_immediate()) +
2481 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2482 "metadata must be found in exactly one place");
2483 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2484 Metadata* md = r->metadata_value();
2485 if (md != _method) f->do_metadata(md);
2486 }
2487 } else if (iter.type() == relocInfo::virtual_call_type) {
2488 // Check compiledIC holders associated with this nmethod
2489 ResourceMark rm;
2490 CompiledIC *ic = CompiledIC_at(&iter);
2491 ic->metadata_do(f);
2492 }
2493 }
2494 }
2495
2496 // Visit the metadata section
2497 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2498 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2499 Metadata* md = *p;
2500 f->do_metadata(md);
2501 }
2502
2503 // Visit metadata not embedded in the other places.
2504 if (_method != nullptr) f->do_metadata(_method);
2505 }
2506
2507 // Heuristic for nuking nmethods even though their oops are live.
2508 // Main purpose is to reduce code cache pressure and get rid of
2509 // nmethods that don't seem to be all that relevant any longer.
2510 bool nmethod::is_cold() {
2511 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2512 // No heuristic unloading at all
2513 return false;
2514 }
2515
2516 if (!is_maybe_on_stack() && is_not_entrant()) {
2517 // Not entrant nmethods that are not on any stack can just
2518 // be removed
2519 return true;
2520 }
2521
2522 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2523 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2524 // On platforms that don't support nmethod entry barriers, we can't
2525 // trust the temporal aspect of the gc epochs. So we can't detect
2526 // cold nmethods on such platforms.
2527 return false;
2528 }
2529
2530 if (!UseCodeCacheFlushing) {
2531 // Bail out if we don't heuristically remove nmethods
2532 return false;
2533 }
2534
2535 // Other code can be phased out more gradually after N GCs
2536 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2537 }
2538
2539 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2540 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2541 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2542 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2543 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2544
2545 class IsUnloadingState: public AllStatic {
2546 static const uint8_t _is_unloading_mask = 1;
2547 static const uint8_t _is_unloading_shift = 0;
2548 static const uint8_t _unloading_cycle_mask = 6;
2549 static const uint8_t _unloading_cycle_shift = 1;
2550
2551 static uint8_t set_is_unloading(uint8_t state, bool value) {
2552 state &= (uint8_t)~_is_unloading_mask;
2553 if (value) {
2554 state |= 1 << _is_unloading_shift;
2555 }
2556 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2557 return state;
2558 }
2559
2560 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2561 state &= (uint8_t)~_unloading_cycle_mask;
2562 state |= (uint8_t)(value << _unloading_cycle_shift);
2563 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2564 return state;
2565 }
2566
2567 public:
2568 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2569 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2570
2571 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2572 uint8_t state = 0;
2573 state = set_is_unloading(state, is_unloading);
2574 state = set_unloading_cycle(state, unloading_cycle);
2575 return state;
2576 }
2577 };
2578
2579 bool nmethod::is_unloading() {
2580 uint8_t state = Atomic::load(&_is_unloading_state);
2581 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2582 if (state_is_unloading) {
2583 return true;
2584 }
2585 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2586 uint8_t current_cycle = CodeCache::unloading_cycle();
2587 if (state_unloading_cycle == current_cycle) {
2588 return false;
2589 }
2590
2591 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2592 // should be unloaded. This can be either because there is a dead oop,
2593 // or because is_cold() heuristically determines it is time to unload.
2594 state_unloading_cycle = current_cycle;
2595 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2596 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2597
2598 // Note that if an nmethod has dead oops, everyone will agree that the
2599 // nmethod is_unloading. However, the is_cold heuristics can yield
2600 // different outcomes, so we guard the computed result with a CAS
2601 // to ensure all threads have a shared view of whether an nmethod
2602 // is_unloading or not.
2603 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2604
2605 if (found_state == state) {
2606 // First to change state, we win
2607 return state_is_unloading;
2608 } else {
2609 // State already set, so use it
2610 return IsUnloadingState::is_unloading(found_state);
2611 }
2612 }
2613
2614 void nmethod::clear_unloading_state() {
2615 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2616 Atomic::store(&_is_unloading_state, state);
2617 }
2618
2619
2620 // This is called at the end of the strong tracing/marking phase of a
2621 // GC to unload an nmethod if it contains otherwise unreachable
2622 // oops or is heuristically found to be not important.
2623 void nmethod::do_unloading(bool unloading_occurred) {
2624 // Make sure the oop's ready to receive visitors
2625 if (is_unloading()) {
2626 unlink();
2627 } else {
2628 unload_nmethod_caches(unloading_occurred);
2629 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2630 if (bs_nm != nullptr) {
2631 bs_nm->disarm(this);
2632 }
2633 }
2634 }
2635
2636 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
2637 // Prevent extra code cache walk for platforms that don't have immediate oops.
2638 if (relocInfo::mustIterateImmediateOopsInCode()) {
2639 RelocIterator iter(this, oops_reloc_begin());
2640
2641 while (iter.next()) {
2642 if (iter.type() == relocInfo::oop_type ) {
2643 oop_Relocation* r = iter.oop_reloc();
2644 // In this loop, we must only follow those oops directly embedded in
2645 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2646 assert(1 == (r->oop_is_immediate()) +
2647 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2648 "oop must be found in exactly one place");
2649 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2650 f->do_oop(r->oop_addr());
2651 }
2652 }
2653 }
2654 }
2655
2656 // Scopes
2657 // This includes oop constants not inlined in the code stream.
2658 for (oop* p = oops_begin(); p < oops_end(); p++) {
2659 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2660 f->do_oop(p);
2661 }
2662 }
2663
2664 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2665 // Process oops in the nmethod
2666 oops_do(cl);
2667
2668 // CodeCache unloading support
2669 mark_as_maybe_on_stack();
2670
2671 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2672 bs_nm->disarm(this);
2673
2674 // There's an assumption made that this function is not used by GCs that
2675 // relocate objects, and therefore we don't call fix_oop_relocations.
2676 }
2677
2678 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2679
2680 void nmethod::oops_do_log_change(const char* state) {
2681 LogTarget(Trace, gc, nmethod) lt;
2682 if (lt.is_enabled()) {
2683 LogStream ls(lt);
2684 CompileTask::print(&ls, this, state, true /* short_form */);
2685 }
2686 }
2687
2688 bool nmethod::oops_do_try_claim() {
2689 if (oops_do_try_claim_weak_request()) {
2690 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2691 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2692 return true;
2693 }
2694 return false;
2695 }
2696
2697 bool nmethod::oops_do_try_claim_weak_request() {
2698 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2699
2700 if ((_oops_do_mark_link == nullptr) &&
2701 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2702 oops_do_log_change("oops_do, mark weak request");
2703 return true;
2704 }
2705 return false;
2706 }
2707
2708 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2709 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2710 }
2711
2712 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2713 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2714
2715 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2716 if (old_next == nullptr) {
2717 oops_do_log_change("oops_do, mark strong done");
2718 }
2719 return old_next;
2720 }
2721
2722 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2723 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2724 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2725
2726 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2727 if (old_next == next) {
2728 oops_do_log_change("oops_do, mark strong request");
2729 }
2730 return old_next;
2731 }
2732
2733 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2734 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2735 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2736
2737 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2738 if (old_next == next) {
2739 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2740 return true;
2741 }
2742 return false;
2743 }
2744
2745 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2746 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2747
2748 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2749 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2750 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2751
2752 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2753 // Self-loop if needed.
2754 if (old_head == nullptr) {
2755 old_head = this;
2756 }
2757 // Try to install end of list and weak done tag.
2758 if (Atomic::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)) {
2759 oops_do_log_change("oops_do, mark weak done");
2760 return nullptr;
2761 } else {
2762 return old_head;
2763 }
2764 }
2765
2766 void nmethod::oops_do_add_to_list_as_strong_done() {
2767 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2768
2769 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2770 // Self-loop if needed.
2771 if (old_head == nullptr) {
2772 old_head = this;
2773 }
2774 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2775 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2776
2777 oops_do_set_strong_done(old_head);
2778 }
2779
2780 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2781 if (!oops_do_try_claim_weak_request()) {
2782 // Failed to claim for weak processing.
2783 oops_do_log_change("oops_do, mark weak request fail");
2784 return;
2785 }
2786
2787 p->do_regular_processing(this);
2788
2789 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2790 if (old_head == nullptr) {
2791 return;
2792 }
2793 oops_do_log_change("oops_do, mark weak done fail");
2794 // Adding to global list failed, another thread added a strong request.
2795 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2796 "must be but is %u", extract_state(_oops_do_mark_link));
2797
2798 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2799
2800 oops_do_set_strong_done(old_head);
2801 // Do missing strong processing.
2802 p->do_remaining_strong_processing(this);
2803 }
2804
2805 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2806 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2807 if (next_raw == nullptr) {
2808 p->do_regular_processing(this);
2809 oops_do_add_to_list_as_strong_done();
2810 return;
2811 }
2812 // Claim failed. Figure out why and handle it.
2813 if (oops_do_has_weak_request(next_raw)) {
2814 oops_do_mark_link* old = next_raw;
2815 // Claim failed because being weak processed (state == "weak request").
2816 // Try to request deferred strong processing.
2817 next_raw = oops_do_try_add_strong_request(old);
2818 if (next_raw == old) {
2819 // Successfully requested deferred strong processing.
2820 return;
2821 }
2822 // Failed because of a concurrent transition. No longer in "weak request" state.
2823 }
2824 if (oops_do_has_any_strong_state(next_raw)) {
2825 // Already claimed for strong processing or requested for such.
2826 return;
2827 }
2828 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2829 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2830 p->do_remaining_strong_processing(this);
2831 return;
2832 }
2833 // Claim failed, some other thread got it.
2834 }
2835
2836 void nmethod::oops_do_marking_prologue() {
2837 assert_at_safepoint();
2838
2839 log_trace(gc, nmethod)("oops_do_marking_prologue");
2840 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2841 }
2842
2843 void nmethod::oops_do_marking_epilogue() {
2844 assert_at_safepoint();
2845
2846 nmethod* next = _oops_do_mark_nmethods;
2847 _oops_do_mark_nmethods = nullptr;
2848 if (next != nullptr) {
2849 nmethod* cur;
2850 do {
2851 cur = next;
2852 next = extract_nmethod(cur->_oops_do_mark_link);
2853 cur->_oops_do_mark_link = nullptr;
2854 DEBUG_ONLY(cur->verify_oop_relocations());
2855
2856 LogTarget(Trace, gc, nmethod) lt;
2857 if (lt.is_enabled()) {
2858 LogStream ls(lt);
2859 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2860 }
2861 // End if self-loop has been detected.
2862 } while (cur != next);
2863 }
2864 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2865 }
2866
2867 inline bool includes(void* p, void* from, void* to) {
2868 return from <= p && p < to;
2869 }
2870
2871
2872 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2873 assert(count >= 2, "must be sentinel values, at least");
2874
2875 #ifdef ASSERT
2876 // must be sorted and unique; we do a binary search in find_pc_desc()
2877 int prev_offset = pcs[0].pc_offset();
2878 assert(prev_offset == PcDesc::lower_offset_limit,
2879 "must start with a sentinel");
2880 for (int i = 1; i < count; i++) {
2881 int this_offset = pcs[i].pc_offset();
2882 assert(this_offset > prev_offset, "offsets must be sorted");
2883 prev_offset = this_offset;
2884 }
2885 assert(prev_offset == PcDesc::upper_offset_limit,
2886 "must end with a sentinel");
2887 #endif //ASSERT
2888
2889 // Search for MethodHandle invokes and tag the nmethod.
2890 for (int i = 0; i < count; i++) {
2891 if (pcs[i].is_method_handle_invoke()) {
2892 set_has_method_handle_invokes(true);
2893 break;
2894 }
2895 }
2896 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler");
2897
2898 int size = count * sizeof(PcDesc);
2899 assert(scopes_pcs_size() >= size, "oob");
2900 memcpy(scopes_pcs_begin(), pcs, size);
2901
2902 // Adjust the final sentinel downward.
2903 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2904 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2905 last_pc->set_pc_offset(content_size() + 1);
2906 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2907 // Fill any rounding gaps with copies of the last record.
2908 last_pc[1] = last_pc[0];
2909 }
2910 // The following assert could fail if sizeof(PcDesc) is not
2911 // an integral multiple of oopSize (the rounding term).
2912 // If it fails, change the logic to always allocate a multiple
2913 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2914 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2915 }
2916
2917 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2918 assert(scopes_data_size() >= size, "oob");
2919 memcpy(scopes_data_begin(), buffer, size);
2920 }
2921
2922 #ifdef ASSERT
2923 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2924 PcDesc* res = nullptr;
2925 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2926 "must start with a sentinel");
2927 // lower + 1 to exclude initial sentinel
2928 for (PcDesc* p = lower + 1; p < upper; p++) {
2929 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2930 if (match_desc(p, pc_offset, approximate)) {
2931 if (res == nullptr) {
2932 res = p;
2933 } else {
2934 res = (PcDesc*) badAddress;
2935 }
2936 }
2937 }
2938 return res;
2939 }
2940 #endif
2941
2942
2943 #ifndef PRODUCT
2944 // Version of method to collect statistic
2945 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2946 PcDesc* lower, PcDesc* upper) {
2947 ++pc_nmethod_stats.pc_desc_queries;
2948 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2949
2950 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2951 assert(desc != nullptr, "PcDesc cache should be initialized already");
2952 if (desc->pc_offset() == (pc - code_begin)) {
2953 // Cached value matched
2954 ++pc_nmethod_stats.pc_desc_tests;
2955 ++pc_nmethod_stats.pc_desc_repeats;
2956 return desc;
2957 }
2958 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2959 }
2960 #endif
2961
2962 // Finds a PcDesc with real-pc equal to "pc"
2963 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2964 PcDesc* lower_incl, PcDesc* upper_incl) {
2965 if ((pc < code_begin) ||
2966 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2967 return nullptr; // PC is wildly out of range
2968 }
2969 int pc_offset = (int) (pc - code_begin);
2970
2971 // Check the PcDesc cache if it contains the desired PcDesc
2972 // (This as an almost 100% hit rate.)
2973 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2974 if (res != nullptr) {
2975 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2976 return res;
2977 }
2978
2979 // Fallback algorithm: quasi-linear search for the PcDesc
2980 // Find the last pc_offset less than the given offset.
2981 // The successor must be the required match, if there is a match at all.
2982 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2983 PcDesc* lower = lower_incl; // this is initial sentinel
2984 PcDesc* upper = upper_incl - 1; // exclude final sentinel
2985 if (lower >= upper) return nullptr; // no PcDescs at all
2986
2987 #define assert_LU_OK \
2988 /* invariant on lower..upper during the following search: */ \
2989 assert(lower->pc_offset() < pc_offset, "sanity"); \
2990 assert(upper->pc_offset() >= pc_offset, "sanity")
2991 assert_LU_OK;
2992
2993 // Use the last successful return as a split point.
2994 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2995 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2996 if (mid->pc_offset() < pc_offset) {
2997 lower = mid;
2998 } else {
2999 upper = mid;
3000 }
3001
3002 // Take giant steps at first (4096, then 256, then 16, then 1)
3003 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3004 const int RADIX = (1 << LOG2_RADIX);
3005 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3006 while ((mid = lower + step) < upper) {
3007 assert_LU_OK;
3008 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3009 if (mid->pc_offset() < pc_offset) {
3010 lower = mid;
3011 } else {
3012 upper = mid;
3013 break;
3014 }
3015 }
3016 assert_LU_OK;
3017 }
3018
3019 // Sneak up on the value with a linear search of length ~16.
3020 while (true) {
3021 assert_LU_OK;
3022 mid = lower + 1;
3023 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3024 if (mid->pc_offset() < pc_offset) {
3025 lower = mid;
3026 } else {
3027 upper = mid;
3028 break;
3029 }
3030 }
3031 #undef assert_LU_OK
3032
3033 if (match_desc(upper, pc_offset, approximate)) {
3034 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3035 if (!Thread::current_in_asgct()) {
3036 // we don't want to modify the cache if we're in ASGCT
3037 // which is typically called in a signal handler
3038 _pc_desc_cache.add_pc_desc(upper);
3039 }
3040 return upper;
3041 } else {
3042 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3043 return nullptr;
3044 }
3045 }
3046
3047 bool nmethod::check_dependency_on(DepChange& changes) {
3048 // What has happened:
3049 // 1) a new class dependee has been added
3050 // 2) dependee and all its super classes have been marked
3051 bool found_check = false; // set true if we are upset
3052 for (Dependencies::DepStream deps(this); deps.next(); ) {
3053 // Evaluate only relevant dependencies.
3054 if (deps.spot_check_dependency_at(changes) != nullptr) {
3055 found_check = true;
3056 NOT_DEBUG(break);
3057 }
3058 }
3059 return found_check;
3060 }
3061
3062 // Called from mark_for_deoptimization, when dependee is invalidated.
3063 bool nmethod::is_dependent_on_method(Method* dependee) {
3064 for (Dependencies::DepStream deps(this); deps.next(); ) {
3065 if (deps.type() != Dependencies::evol_method)
3066 continue;
3067 Method* method = deps.method_argument(0);
3068 if (method == dependee) return true;
3069 }
3070 return false;
3071 }
3072
3073 void nmethod_init() {
3074 // make sure you didn't forget to adjust the filler fields
3075 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3076 }
3077
3078 // -----------------------------------------------------------------------------
3079 // Verification
3080
3081 class VerifyOopsClosure: public OopClosure {
3082 nmethod* _nm;
3083 bool _ok;
3084 public:
3085 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3086 bool ok() { return _ok; }
3087 virtual void do_oop(oop* p) {
3088 if (oopDesc::is_oop_or_null(*p)) return;
3089 // Print diagnostic information before calling print_nmethod().
3090 // Assertions therein might prevent call from returning.
3091 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3092 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3093 if (_ok) {
3094 _nm->print_nmethod(true);
3095 _ok = false;
3096 }
3097 }
3098 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3099 };
3100
3101 class VerifyMetadataClosure: public MetadataClosure {
3102 public:
3103 void do_metadata(Metadata* md) {
3104 if (md->is_method()) {
3105 Method* method = (Method*)md;
3106 assert(!method->is_old(), "Should not be installing old methods");
3107 }
3108 }
3109 };
3110
3111
3112 void nmethod::verify() {
3113 if (is_not_entrant())
3114 return;
3115
3116 // Make sure all the entry points are correctly aligned for patching.
3117 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
3118
3119 // assert(oopDesc::is_oop(method()), "must be valid");
3120
3121 ResourceMark rm;
3122
3123 if (!CodeCache::contains(this)) {
3124 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3125 }
3126
3127 if(is_native_method() )
3128 return;
3129
3130 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3131 if (nm != this) {
3132 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3133 }
3134
3135 // Verification can triggered during shutdown after AOTCodeCache is closed.
3136 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3137 if (!is_aot() || AOTCodeCache::is_on()) {
3138 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3139 if (! p->verify(this)) {
3140 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3141 }
3142 }
3143
3144 #ifdef ASSERT
3145 #if INCLUDE_JVMCI
3146 {
3147 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3148 ImmutableOopMapSet* oms = oop_maps();
3149 ImplicitExceptionTable implicit_table(this);
3150 for (uint i = 0; i < implicit_table.len(); i++) {
3151 int exec_offset = (int) implicit_table.get_exec_offset(i);
3152 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3153 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3154 bool found = false;
3155 for (int i = 0, imax = oms->count(); i < imax; i++) {
3156 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3157 found = true;
3158 break;
3159 }
3160 }
3161 assert(found, "missing oopmap");
3162 }
3163 }
3164 }
3165 #endif
3166 #endif
3167 }
3168
3169 VerifyOopsClosure voc(this);
3170 oops_do(&voc);
3171 assert(voc.ok(), "embedded oops must be OK");
3172 Universe::heap()->verify_nmethod(this);
3173
3174 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3175 nm->method()->external_name(), p2i(_oops_do_mark_link));
3176 if (!is_aot() || AOTCodeCache::is_on()) {
3177 verify_scopes();
3178 }
3179
3180 CompiledICLocker nm_verify(this);
3181 VerifyMetadataClosure vmc;
3182 metadata_do(&vmc);
3183 }
3184
3185
3186 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3187
3188 // Verify IC only when nmethod installation is finished.
3189 if (!is_not_installed()) {
3190 if (CompiledICLocker::is_safe(this)) {
3191 if (is_inline_cache) {
3192 CompiledIC_at(this, call_site);
3193 } else {
3194 CompiledDirectCall::at(call_site);
3195 }
3196 } else {
3197 CompiledICLocker ml_verify(this);
3198 if (is_inline_cache) {
3199 CompiledIC_at(this, call_site);
3200 } else {
3201 CompiledDirectCall::at(call_site);
3202 }
3203 }
3204 }
3205
3206 HandleMark hm(Thread::current());
3207
3208 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3209 assert(pd != nullptr, "PcDesc must exist");
3210 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3211 !sd->is_top(); sd = sd->sender()) {
3212 sd->verify();
3213 }
3214 }
3215
3216 void nmethod::verify_scopes() {
3217 if( !method() ) return; // Runtime stubs have no scope
3218 if (method()->is_native()) return; // Ignore stub methods.
3219 // iterate through all interrupt point
3220 // and verify the debug information is valid.
3221 RelocIterator iter(this);
3222 while (iter.next()) {
3223 address stub = nullptr;
3224 switch (iter.type()) {
3225 case relocInfo::virtual_call_type:
3226 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3227 break;
3228 case relocInfo::opt_virtual_call_type:
3229 stub = iter.opt_virtual_call_reloc()->static_stub();
3230 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3231 break;
3232 case relocInfo::static_call_type:
3233 stub = iter.static_call_reloc()->static_stub();
3234 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3235 break;
3236 case relocInfo::runtime_call_type:
3237 case relocInfo::runtime_call_w_cp_type: {
3238 address destination = iter.reloc()->value();
3239 // Right now there is no way to find out which entries support
3240 // an interrupt point. It would be nice if we had this
3241 // information in a table.
3242 break;
3243 }
3244 default:
3245 break;
3246 }
3247 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3248 }
3249 }
3250
3251
3252 // -----------------------------------------------------------------------------
3253 // Printing operations
3254
3255 void nmethod::print_on_impl(outputStream* st) const {
3256 ResourceMark rm;
3257
3258 st->print("Compiled method ");
3259
3260 if (is_compiled_by_c1()) {
3261 st->print("(c1) ");
3262 } else if (is_compiled_by_c2()) {
3263 st->print("(c2) ");
3264 } else if (is_compiled_by_jvmci()) {
3265 st->print("(JVMCI) ");
3266 } else {
3267 st->print("(n/a) ");
3268 }
3269
3270 print_on_with_msg(st, nullptr);
3271
3272 if (WizardMode) {
3273 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3274 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3275 st->print(" { ");
3276 st->print_cr("%s ", state());
3277 st->print_cr("}:");
3278 }
3279 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3280 p2i(this),
3281 p2i(this) + size(),
3282 size());
3283 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3284 p2i(consts_begin()),
3285 p2i(consts_end()),
3286 consts_size());
3287 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3288 p2i(insts_begin()),
3289 p2i(insts_end()),
3290 insts_size());
3291 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3292 p2i(stub_begin()),
3293 p2i(stub_end()),
3294 stub_size());
3295 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3296 p2i(oops_begin()),
3297 p2i(oops_end()),
3298 oops_size());
3299 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3300 p2i(mutable_data_begin()),
3301 p2i(mutable_data_end()),
3302 mutable_data_size());
3303 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3304 p2i(relocation_begin()),
3305 p2i(relocation_end()),
3306 relocation_size());
3307 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3308 p2i(metadata_begin()),
3309 p2i(metadata_end()),
3310 metadata_size());
3311 #if INCLUDE_JVMCI
3312 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3313 p2i(jvmci_data_begin()),
3314 p2i(jvmci_data_end()),
3315 jvmci_data_size());
3316 #endif
3317 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3318 p2i(immutable_data_begin()),
3319 p2i(immutable_data_end()),
3320 immutable_data_size());
3321 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3322 p2i(dependencies_begin()),
3323 p2i(dependencies_end()),
3324 dependencies_size());
3325 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3326 p2i(nul_chk_table_begin()),
3327 p2i(nul_chk_table_end()),
3328 nul_chk_table_size());
3329 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3330 p2i(handler_table_begin()),
3331 p2i(handler_table_end()),
3332 handler_table_size());
3333 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3334 p2i(scopes_pcs_begin()),
3335 p2i(scopes_pcs_end()),
3336 scopes_pcs_size());
3337 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3338 p2i(scopes_data_begin()),
3339 p2i(scopes_data_end()),
3340 scopes_data_size());
3341 #if INCLUDE_JVMCI
3342 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3343 p2i(speculations_begin()),
3344 p2i(speculations_end()),
3345 speculations_size());
3346 #endif
3347 if (AOTCodeCache::is_on() && _aot_code_entry != nullptr) {
3348 _aot_code_entry->print(st);
3349 }
3350 }
3351
3352 void nmethod::print_code() {
3353 ResourceMark m;
3354 ttyLocker ttyl;
3355 // Call the specialized decode method of this class.
3356 decode(tty);
3357 }
3358
3359 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3360
3361 void nmethod::print_dependencies_on(outputStream* out) {
3362 ResourceMark rm;
3363 stringStream st;
3364 st.print_cr("Dependencies:");
3365 for (Dependencies::DepStream deps(this); deps.next(); ) {
3366 deps.print_dependency(&st);
3367 InstanceKlass* ctxk = deps.context_type();
3368 if (ctxk != nullptr) {
3369 if (ctxk->is_dependent_nmethod(this)) {
3370 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3371 }
3372 }
3373 deps.log_dependency(); // put it into the xml log also
3374 }
3375 out->print_raw(st.as_string());
3376 }
3377 #endif
3378
3379 #if defined(SUPPORT_DATA_STRUCTS)
3380
3381 // Print the oops from the underlying CodeBlob.
3382 void nmethod::print_oops(outputStream* st) {
3383 ResourceMark m;
3384 st->print("Oops:");
3385 if (oops_begin() < oops_end()) {
3386 st->cr();
3387 for (oop* p = oops_begin(); p < oops_end(); p++) {
3388 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3389 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3390 if (Universe::contains_non_oop_word(p)) {
3391 st->print_cr("NON_OOP");
3392 continue; // skip non-oops
3393 }
3394 if (*p == nullptr) {
3395 st->print_cr("nullptr-oop");
3396 continue; // skip non-oops
3397 }
3398 (*p)->print_value_on(st);
3399 st->cr();
3400 }
3401 } else {
3402 st->print_cr(" <list empty>");
3403 }
3404 }
3405
3406 // Print metadata pool.
3407 void nmethod::print_metadata(outputStream* st) {
3408 ResourceMark m;
3409 st->print("Metadata:");
3410 if (metadata_begin() < metadata_end()) {
3411 st->cr();
3412 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3413 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3414 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3415 if (*p && *p != Universe::non_oop_word()) {
3416 (*p)->print_value_on(st);
3417 }
3418 st->cr();
3419 }
3420 } else {
3421 st->print_cr(" <list empty>");
3422 }
3423 }
3424
3425 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3426 void nmethod::print_scopes_on(outputStream* st) {
3427 // Find the first pc desc for all scopes in the code and print it.
3428 ResourceMark rm;
3429 st->print("scopes:");
3430 if (scopes_pcs_begin() < scopes_pcs_end()) {
3431 st->cr();
3432 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3433 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3434 continue;
3435
3436 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3437 while (sd != nullptr) {
3438 sd->print_on(st, p); // print output ends with a newline
3439 sd = sd->sender();
3440 }
3441 }
3442 } else {
3443 st->print_cr(" <list empty>");
3444 }
3445 }
3446 #endif
3447
3448 #ifndef PRODUCT // RelocIterator does support printing only then.
3449 void nmethod::print_relocations_on(outputStream* st) {
3450 ResourceMark m; // in case methods get printed via the debugger
3451 st->print_cr("relocations:");
3452 RelocIterator iter(this);
3453 iter.print_on(st);
3454 }
3455 #endif
3456
3457 void nmethod::print_pcs_on(outputStream* st) {
3458 ResourceMark m; // in case methods get printed via debugger
3459 st->print("pc-bytecode offsets:");
3460 if (scopes_pcs_begin() < scopes_pcs_end()) {
3461 st->cr();
3462 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3463 p->print_on(st, this); // print output ends with a newline
3464 }
3465 } else {
3466 st->print_cr(" <list empty>");
3467 }
3468 }
3469
3470 void nmethod::print_handler_table() {
3471 ExceptionHandlerTable(this).print(code_begin());
3472 }
3473
3474 void nmethod::print_nul_chk_table() {
3475 ImplicitExceptionTable(this).print(code_begin());
3476 }
3477
3478 void nmethod::print_recorded_oop(int log_n, int i) {
3479 void* value;
3480
3481 if (i == 0) {
3482 value = nullptr;
3483 } else {
3484 // Be careful around non-oop words. Don't create an oop
3485 // with that value, or it will assert in verification code.
3486 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3487 value = Universe::non_oop_word();
3488 } else {
3489 value = oop_at(i);
3490 }
3491 }
3492
3493 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3494
3495 if (value == Universe::non_oop_word()) {
3496 tty->print("non-oop word");
3497 } else {
3498 if (value == nullptr) {
3499 tty->print("nullptr-oop");
3500 } else {
3501 oop_at(i)->print_value_on(tty);
3502 }
3503 }
3504
3505 tty->cr();
3506 }
3507
3508 void nmethod::print_recorded_oops() {
3509 const int n = oops_count();
3510 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3511 tty->print("Recorded oops:");
3512 if (n > 0) {
3513 tty->cr();
3514 for (int i = 0; i < n; i++) {
3515 print_recorded_oop(log_n, i);
3516 }
3517 } else {
3518 tty->print_cr(" <list empty>");
3519 }
3520 }
3521
3522 void nmethod::print_recorded_metadata() {
3523 const int n = metadata_count();
3524 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3525 tty->print("Recorded metadata:");
3526 if (n > 0) {
3527 tty->cr();
3528 for (int i = 0; i < n; i++) {
3529 Metadata* m = metadata_at(i);
3530 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3531 if (m == (Metadata*)Universe::non_oop_word()) {
3532 tty->print("non-metadata word");
3533 } else if (m == nullptr) {
3534 tty->print("nullptr-oop");
3535 } else {
3536 Metadata::print_value_on_maybe_null(tty, m);
3537 }
3538 tty->cr();
3539 }
3540 } else {
3541 tty->print_cr(" <list empty>");
3542 }
3543 }
3544 #endif
3545
3546 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3547
3548 void nmethod::print_constant_pool(outputStream* st) {
3549 //-----------------------------------
3550 //---< Print the constant pool >---
3551 //-----------------------------------
3552 int consts_size = this->consts_size();
3553 if ( consts_size > 0 ) {
3554 unsigned char* cstart = this->consts_begin();
3555 unsigned char* cp = cstart;
3556 unsigned char* cend = cp + consts_size;
3557 unsigned int bytes_per_line = 4;
3558 unsigned int CP_alignment = 8;
3559 unsigned int n;
3560
3561 st->cr();
3562
3563 //---< print CP header to make clear what's printed >---
3564 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3565 n = bytes_per_line;
3566 st->print_cr("[Constant Pool]");
3567 Disassembler::print_location(cp, cstart, cend, st, true, true);
3568 Disassembler::print_hexdata(cp, n, st, true);
3569 st->cr();
3570 } else {
3571 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3572 st->print_cr("[Constant Pool (unaligned)]");
3573 }
3574
3575 //---< print CP contents, bytes_per_line at a time >---
3576 while (cp < cend) {
3577 Disassembler::print_location(cp, cstart, cend, st, true, false);
3578 Disassembler::print_hexdata(cp, n, st, false);
3579 cp += n;
3580 n = bytes_per_line;
3581 st->cr();
3582 }
3583
3584 //---< Show potential alignment gap between constant pool and code >---
3585 cend = code_begin();
3586 if( cp < cend ) {
3587 n = 4;
3588 st->print_cr("[Code entry alignment]");
3589 while (cp < cend) {
3590 Disassembler::print_location(cp, cstart, cend, st, false, false);
3591 cp += n;
3592 st->cr();
3593 }
3594 }
3595 } else {
3596 st->print_cr("[Constant Pool (empty)]");
3597 }
3598 st->cr();
3599 }
3600
3601 #endif
3602
3603 // Disassemble this nmethod.
3604 // Print additional debug information, if requested. This could be code
3605 // comments, block comments, profiling counters, etc.
3606 // The undisassembled format is useful no disassembler library is available.
3607 // The resulting hex dump (with markers) can be disassembled later, or on
3608 // another system, when/where a disassembler library is available.
3609 void nmethod::decode2(outputStream* ost) const {
3610
3611 // Called from frame::back_trace_with_decode without ResourceMark.
3612 ResourceMark rm;
3613
3614 // Make sure we have a valid stream to print on.
3615 outputStream* st = ost ? ost : tty;
3616
3617 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3618 const bool use_compressed_format = true;
3619 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3620 AbstractDisassembler::show_block_comment());
3621 #else
3622 const bool use_compressed_format = Disassembler::is_abstract();
3623 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3624 AbstractDisassembler::show_block_comment());
3625 #endif
3626
3627 st->cr();
3628 this->print_on(st);
3629 st->cr();
3630
3631 #if defined(SUPPORT_ASSEMBLY)
3632 //----------------------------------
3633 //---< Print real disassembly >---
3634 //----------------------------------
3635 if (! use_compressed_format) {
3636 st->print_cr("[Disassembly]");
3637 Disassembler::decode(const_cast<nmethod*>(this), st);
3638 st->bol();
3639 st->print_cr("[/Disassembly]");
3640 return;
3641 }
3642 #endif
3643
3644 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3645
3646 // Compressed undisassembled disassembly format.
3647 // The following status values are defined/supported:
3648 // = 0 - currently at bol() position, nothing printed yet on current line.
3649 // = 1 - currently at position after print_location().
3650 // > 1 - in the midst of printing instruction stream bytes.
3651 int compressed_format_idx = 0;
3652 int code_comment_column = 0;
3653 const int instr_maxlen = Assembler::instr_maxlen();
3654 const uint tabspacing = 8;
3655 unsigned char* start = this->code_begin();
3656 unsigned char* p = this->code_begin();
3657 unsigned char* end = this->code_end();
3658 unsigned char* pss = p; // start of a code section (used for offsets)
3659
3660 if ((start == nullptr) || (end == nullptr)) {
3661 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3662 return;
3663 }
3664 #endif
3665
3666 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3667 //---< plain abstract disassembly, no comments or anything, just section headers >---
3668 if (use_compressed_format && ! compressed_with_comments) {
3669 const_cast<nmethod*>(this)->print_constant_pool(st);
3670
3671 //---< Open the output (Marker for post-mortem disassembler) >---
3672 st->print_cr("[MachCode]");
3673 const char* header = nullptr;
3674 address p0 = p;
3675 while (p < end) {
3676 address pp = p;
3677 while ((p < end) && (header == nullptr)) {
3678 header = nmethod_section_label(p);
3679 pp = p;
3680 p += Assembler::instr_len(p);
3681 }
3682 if (pp > p0) {
3683 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3684 p0 = pp;
3685 p = pp;
3686 header = nullptr;
3687 } else if (header != nullptr) {
3688 st->bol();
3689 st->print_cr("%s", header);
3690 header = nullptr;
3691 }
3692 }
3693 //---< Close the output (Marker for post-mortem disassembler) >---
3694 st->bol();
3695 st->print_cr("[/MachCode]");
3696 return;
3697 }
3698 #endif
3699
3700 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3701 //---< abstract disassembly with comments and section headers merged in >---
3702 if (compressed_with_comments) {
3703 const_cast<nmethod*>(this)->print_constant_pool(st);
3704
3705 //---< Open the output (Marker for post-mortem disassembler) >---
3706 st->print_cr("[MachCode]");
3707 while ((p < end) && (p != nullptr)) {
3708 const int instruction_size_in_bytes = Assembler::instr_len(p);
3709
3710 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3711 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3712 // Prints nmethod_section_label as well.
3713 if (AbstractDisassembler::show_block_comment()) {
3714 print_block_comment(st, p);
3715 if (st->position() == 0) {
3716 compressed_format_idx = 0;
3717 }
3718 }
3719
3720 //---< New location information after line break >---
3721 if (compressed_format_idx == 0) {
3722 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3723 compressed_format_idx = 1;
3724 }
3725
3726 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3727 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3728 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3729
3730 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3731 //---< interrupt instruction byte stream for code comment >---
3732 if (compressed_format_idx > 1) {
3733 st->cr(); // interrupt byte stream
3734 st->cr(); // add an empty line
3735 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3736 }
3737 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3738 st->bol();
3739 compressed_format_idx = 0;
3740 }
3741
3742 //---< New location information after line break >---
3743 if (compressed_format_idx == 0) {
3744 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3745 compressed_format_idx = 1;
3746 }
3747
3748 //---< Nicely align instructions for readability >---
3749 if (compressed_format_idx > 1) {
3750 Disassembler::print_delimiter(st);
3751 }
3752
3753 //---< Now, finally, print the actual instruction bytes >---
3754 unsigned char* p0 = p;
3755 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3756 compressed_format_idx += (int)(p - p0);
3757
3758 if (Disassembler::start_newline(compressed_format_idx-1)) {
3759 st->cr();
3760 compressed_format_idx = 0;
3761 }
3762 }
3763 //---< Close the output (Marker for post-mortem disassembler) >---
3764 st->bol();
3765 st->print_cr("[/MachCode]");
3766 return;
3767 }
3768 #endif
3769 }
3770
3771 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3772
3773 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3774 RelocIterator iter(this, begin, end);
3775 bool have_one = false;
3776 while (iter.next()) {
3777 have_one = true;
3778 switch (iter.type()) {
3779 case relocInfo::none: {
3780 // Skip it and check next
3781 break;
3782 }
3783 case relocInfo::oop_type: {
3784 // Get a non-resizable resource-allocated stringStream.
3785 // Our callees make use of (nested) ResourceMarks.
3786 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3787 oop_Relocation* r = iter.oop_reloc();
3788 oop obj = r->oop_value();
3789 st.print("oop(");
3790 if (obj == nullptr) st.print("nullptr");
3791 else obj->print_value_on(&st);
3792 st.print(")");
3793 return st.as_string();
3794 }
3795 case relocInfo::metadata_type: {
3796 stringStream st;
3797 metadata_Relocation* r = iter.metadata_reloc();
3798 Metadata* obj = r->metadata_value();
3799 st.print("metadata(");
3800 if (obj == nullptr) st.print("nullptr");
3801 else obj->print_value_on(&st);
3802 st.print(")");
3803 return st.as_string();
3804 }
3805 case relocInfo::runtime_call_type:
3806 case relocInfo::runtime_call_w_cp_type: {
3807 stringStream st;
3808 st.print("runtime_call");
3809 CallRelocation* r = (CallRelocation*)iter.reloc();
3810 address dest = r->destination();
3811 if (StubRoutines::contains(dest)) {
3812 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3813 if (desc == nullptr) {
3814 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3815 }
3816 if (desc != nullptr) {
3817 st.print(" Stub::%s", desc->name());
3818 return st.as_string();
3819 }
3820 }
3821 CodeBlob* cb = CodeCache::find_blob(dest);
3822 if (cb != nullptr) {
3823 st.print(" %s", cb->name());
3824 } else {
3825 ResourceMark rm;
3826 const int buflen = 1024;
3827 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3828 int offset;
3829 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3830 st.print(" %s", buf);
3831 if (offset != 0) {
3832 st.print("+%d", offset);
3833 }
3834 }
3835 }
3836 return st.as_string();
3837 }
3838 case relocInfo::virtual_call_type: {
3839 stringStream st;
3840 st.print_raw("virtual_call");
3841 virtual_call_Relocation* r = iter.virtual_call_reloc();
3842 Method* m = r->method_value();
3843 if (m != nullptr) {
3844 assert(m->is_method(), "");
3845 m->print_short_name(&st);
3846 }
3847 return st.as_string();
3848 }
3849 case relocInfo::opt_virtual_call_type: {
3850 stringStream st;
3851 st.print_raw("optimized virtual_call");
3852 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3853 Method* m = r->method_value();
3854 if (m != nullptr) {
3855 assert(m->is_method(), "");
3856 m->print_short_name(&st);
3857 }
3858 return st.as_string();
3859 }
3860 case relocInfo::static_call_type: {
3861 stringStream st;
3862 st.print_raw("static_call");
3863 static_call_Relocation* r = iter.static_call_reloc();
3864 Method* m = r->method_value();
3865 if (m != nullptr) {
3866 assert(m->is_method(), "");
3867 m->print_short_name(&st);
3868 }
3869 return st.as_string();
3870 }
3871 case relocInfo::static_stub_type: return "static_stub";
3872 case relocInfo::external_word_type: return "external_word";
3873 case relocInfo::internal_word_type: return "internal_word";
3874 case relocInfo::section_word_type: return "section_word";
3875 case relocInfo::poll_type: return "poll";
3876 case relocInfo::poll_return_type: return "poll_return";
3877 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3878 case relocInfo::entry_guard_type: return "entry_guard";
3879 case relocInfo::post_call_nop_type: return "post_call_nop";
3880 case relocInfo::barrier_type: {
3881 barrier_Relocation* const reloc = iter.barrier_reloc();
3882 stringStream st;
3883 st.print("barrier format=%d", reloc->format());
3884 return st.as_string();
3885 }
3886
3887 case relocInfo::type_mask: return "type_bit_mask";
3888
3889 default: {
3890 stringStream st;
3891 st.print("unknown relocInfo=%d", (int) iter.type());
3892 return st.as_string();
3893 }
3894 }
3895 }
3896 return have_one ? "other" : nullptr;
3897 }
3898
3899 // Return the last scope in (begin..end]
3900 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3901 PcDesc* p = pc_desc_near(begin+1);
3902 if (p != nullptr && p->real_pc(this) <= end) {
3903 return new ScopeDesc(this, p);
3904 }
3905 return nullptr;
3906 }
3907
3908 const char* nmethod::nmethod_section_label(address pos) const {
3909 const char* label = nullptr;
3910 if (pos == code_begin()) label = "[Instructions begin]";
3911 if (pos == entry_point()) label = "[Entry Point]";
3912 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3913 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3914 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3915 // Check stub_code before checking exception_handler or deopt_handler.
3916 if (pos == this->stub_begin()) label = "[Stub Code]";
3917 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3918 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3919 return label;
3920 }
3921
3922 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3923 if (print_section_labels) {
3924 const char* label = nmethod_section_label(block_begin);
3925 if (label != nullptr) {
3926 stream->bol();
3927 stream->print_cr("%s", label);
3928 }
3929 }
3930
3931 if (block_begin == entry_point()) {
3932 Method* m = method();
3933 if (m != nullptr) {
3934 stream->print(" # ");
3935 m->print_value_on(stream);
3936 stream->cr();
3937 }
3938 if (m != nullptr && !is_osr_method()) {
3939 ResourceMark rm;
3940 int sizeargs = m->size_of_parameters();
3941 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3942 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3943 {
3944 int sig_index = 0;
3945 if (!m->is_static())
3946 sig_bt[sig_index++] = T_OBJECT; // 'this'
3947 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3948 BasicType t = ss.type();
3949 sig_bt[sig_index++] = t;
3950 if (type2size[t] == 2) {
3951 sig_bt[sig_index++] = T_VOID;
3952 } else {
3953 assert(type2size[t] == 1, "size is 1 or 2");
3954 }
3955 }
3956 assert(sig_index == sizeargs, "");
3957 }
3958 const char* spname = "sp"; // make arch-specific?
3959 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3960 int stack_slot_offset = this->frame_size() * wordSize;
3961 int tab1 = 14, tab2 = 24;
3962 int sig_index = 0;
3963 int arg_index = (m->is_static() ? 0 : -1);
3964 bool did_old_sp = false;
3965 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3966 bool at_this = (arg_index == -1);
3967 bool at_old_sp = false;
3968 BasicType t = (at_this ? T_OBJECT : ss.type());
3969 assert(t == sig_bt[sig_index], "sigs in sync");
3970 if (at_this)
3971 stream->print(" # this: ");
3972 else
3973 stream->print(" # parm%d: ", arg_index);
3974 stream->move_to(tab1);
3975 VMReg fst = regs[sig_index].first();
3976 VMReg snd = regs[sig_index].second();
3977 if (fst->is_reg()) {
3978 stream->print("%s", fst->name());
3979 if (snd->is_valid()) {
3980 stream->print(":%s", snd->name());
3981 }
3982 } else if (fst->is_stack()) {
3983 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3984 if (offset == stack_slot_offset) at_old_sp = true;
3985 stream->print("[%s+0x%x]", spname, offset);
3986 } else {
3987 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3988 }
3989 stream->print(" ");
3990 stream->move_to(tab2);
3991 stream->print("= ");
3992 if (at_this) {
3993 m->method_holder()->print_value_on(stream);
3994 } else {
3995 bool did_name = false;
3996 if (!at_this && ss.is_reference()) {
3997 Symbol* name = ss.as_symbol();
3998 name->print_value_on(stream);
3999 did_name = true;
4000 }
4001 if (!did_name)
4002 stream->print("%s", type2name(t));
4003 }
4004 if (at_old_sp) {
4005 stream->print(" (%s of caller)", spname);
4006 did_old_sp = true;
4007 }
4008 stream->cr();
4009 sig_index += type2size[t];
4010 arg_index += 1;
4011 if (!at_this) ss.next();
4012 }
4013 if (!did_old_sp) {
4014 stream->print(" # ");
4015 stream->move_to(tab1);
4016 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4017 stream->print(" (%s of caller)", spname);
4018 stream->cr();
4019 }
4020 }
4021 }
4022 }
4023
4024 // Returns whether this nmethod has code comments.
4025 bool nmethod::has_code_comment(address begin, address end) {
4026 // scopes?
4027 ScopeDesc* sd = scope_desc_in(begin, end);
4028 if (sd != nullptr) return true;
4029
4030 // relocations?
4031 const char* str = reloc_string_for(begin, end);
4032 if (str != nullptr) return true;
4033
4034 // implicit exceptions?
4035 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4036 if (cont_offset != 0) return true;
4037
4038 return false;
4039 }
4040
4041 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4042 ImplicitExceptionTable implicit_table(this);
4043 int pc_offset = (int)(begin - code_begin());
4044 int cont_offset = implicit_table.continuation_offset(pc_offset);
4045 bool oop_map_required = false;
4046 if (cont_offset != 0) {
4047 st->move_to(column, 6, 0);
4048 if (pc_offset == cont_offset) {
4049 st->print("; implicit exception: deoptimizes");
4050 oop_map_required = true;
4051 } else {
4052 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4053 }
4054 }
4055
4056 // Find an oopmap in (begin, end]. We use the odd half-closed
4057 // interval so that oop maps and scope descs which are tied to the
4058 // byte after a call are printed with the call itself. OopMaps
4059 // associated with implicit exceptions are printed with the implicit
4060 // instruction.
4061 address base = code_begin();
4062 ImmutableOopMapSet* oms = oop_maps();
4063 if (oms != nullptr) {
4064 for (int i = 0, imax = oms->count(); i < imax; i++) {
4065 const ImmutableOopMapPair* pair = oms->pair_at(i);
4066 const ImmutableOopMap* om = pair->get_from(oms);
4067 address pc = base + pair->pc_offset();
4068 if (pc >= begin) {
4069 #if INCLUDE_JVMCI
4070 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4071 #else
4072 bool is_implicit_deopt = false;
4073 #endif
4074 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4075 st->move_to(column, 6, 0);
4076 st->print("; ");
4077 om->print_on(st);
4078 oop_map_required = false;
4079 }
4080 }
4081 if (pc > end) {
4082 break;
4083 }
4084 }
4085 }
4086 assert(!oop_map_required, "missed oopmap");
4087
4088 Thread* thread = Thread::current();
4089
4090 // Print any debug info present at this pc.
4091 ScopeDesc* sd = scope_desc_in(begin, end);
4092 if (sd != nullptr) {
4093 st->move_to(column, 6, 0);
4094 if (sd->bci() == SynchronizationEntryBCI) {
4095 st->print(";*synchronization entry");
4096 } else if (sd->bci() == AfterBci) {
4097 st->print(";* method exit (unlocked if synchronized)");
4098 } else if (sd->bci() == UnwindBci) {
4099 st->print(";* unwind (locked if synchronized)");
4100 } else if (sd->bci() == AfterExceptionBci) {
4101 st->print(";* unwind (unlocked if synchronized)");
4102 } else if (sd->bci() == UnknownBci) {
4103 st->print(";* unknown");
4104 } else if (sd->bci() == InvalidFrameStateBci) {
4105 st->print(";* invalid frame state");
4106 } else {
4107 if (sd->method() == nullptr) {
4108 st->print("method is nullptr");
4109 } else if (sd->method()->is_native()) {
4110 st->print("method is native");
4111 } else {
4112 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4113 st->print(";*%s", Bytecodes::name(bc));
4114 switch (bc) {
4115 case Bytecodes::_invokevirtual:
4116 case Bytecodes::_invokespecial:
4117 case Bytecodes::_invokestatic:
4118 case Bytecodes::_invokeinterface:
4119 {
4120 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4121 st->print(" ");
4122 if (invoke.name() != nullptr)
4123 invoke.name()->print_symbol_on(st);
4124 else
4125 st->print("<UNKNOWN>");
4126 break;
4127 }
4128 case Bytecodes::_getfield:
4129 case Bytecodes::_putfield:
4130 case Bytecodes::_getstatic:
4131 case Bytecodes::_putstatic:
4132 {
4133 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4134 st->print(" ");
4135 if (field.name() != nullptr)
4136 field.name()->print_symbol_on(st);
4137 else
4138 st->print("<UNKNOWN>");
4139 }
4140 default:
4141 break;
4142 }
4143 }
4144 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4145 }
4146
4147 // Print all scopes
4148 for (;sd != nullptr; sd = sd->sender()) {
4149 st->move_to(column, 6, 0);
4150 st->print("; -");
4151 if (sd->should_reexecute()) {
4152 st->print(" (reexecute)");
4153 }
4154 if (sd->method() == nullptr) {
4155 st->print("method is nullptr");
4156 } else {
4157 sd->method()->print_short_name(st);
4158 }
4159 int lineno = sd->method()->line_number_from_bci(sd->bci());
4160 if (lineno != -1) {
4161 st->print("@%d (line %d)", sd->bci(), lineno);
4162 } else {
4163 st->print("@%d", sd->bci());
4164 }
4165 st->cr();
4166 }
4167 }
4168
4169 // Print relocation information
4170 // Prevent memory leak: allocating without ResourceMark.
4171 ResourceMark rm;
4172 const char* str = reloc_string_for(begin, end);
4173 if (str != nullptr) {
4174 if (sd != nullptr) st->cr();
4175 st->move_to(column, 6, 0);
4176 st->print("; {%s}", str);
4177 }
4178 }
4179
4180 #endif
4181
4182 address nmethod::call_instruction_address(address pc) const {
4183 if (NativeCall::is_call_before(pc)) {
4184 NativeCall *ncall = nativeCall_before(pc);
4185 return ncall->instruction_address();
4186 }
4187 return nullptr;
4188 }
4189
4190 void nmethod::print_value_on_impl(outputStream* st) const {
4191 st->print_cr("nmethod");
4192 #if defined(SUPPORT_DATA_STRUCTS)
4193 print_on_with_msg(st, nullptr);
4194 #endif
4195 }
4196
4197 #ifndef PRODUCT
4198
4199 void nmethod::print_calls(outputStream* st) {
4200 RelocIterator iter(this);
4201 while (iter.next()) {
4202 switch (iter.type()) {
4203 case relocInfo::virtual_call_type: {
4204 CompiledICLocker ml_verify(this);
4205 CompiledIC_at(&iter)->print();
4206 break;
4207 }
4208 case relocInfo::static_call_type:
4209 case relocInfo::opt_virtual_call_type:
4210 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4211 CompiledDirectCall::at(iter.reloc())->print();
4212 break;
4213 default:
4214 break;
4215 }
4216 }
4217 }
4218
4219 void nmethod::print_statistics() {
4220 ttyLocker ttyl;
4221 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4222 native_nmethod_stats.print_native_nmethod_stats();
4223 #ifdef COMPILER1
4224 c1_java_nmethod_stats.print_nmethod_stats("C1");
4225 #endif
4226 #ifdef COMPILER2
4227 c2_java_nmethod_stats.print_nmethod_stats("C2");
4228 #endif
4229 #if INCLUDE_JVMCI
4230 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4231 #endif
4232 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4233 DebugInformationRecorder::print_statistics();
4234 pc_nmethod_stats.print_pc_stats();
4235 Dependencies::print_statistics();
4236 ExternalsRecorder::print_statistics();
4237 if (xtty != nullptr) xtty->tail("statistics");
4238 }
4239
4240 #endif // !PRODUCT
4241
4242 #if INCLUDE_JVMCI
4243 void nmethod::update_speculation(JavaThread* thread) {
4244 jlong speculation = thread->pending_failed_speculation();
4245 if (speculation != 0) {
4246 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4247 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4248 thread->set_pending_failed_speculation(0);
4249 }
4250 }
4251
4252 const char* nmethod::jvmci_name() {
4253 if (jvmci_nmethod_data() != nullptr) {
4254 return jvmci_nmethod_data()->name();
4255 }
4256 return nullptr;
4257 }
4258 #endif
4259
4260 void nmethod::prepare_for_archiving_impl() {
4261 CodeBlob::prepare_for_archiving_impl();
4262 _deoptimization_generation = 0;
4263 _gc_epoch = 0;
4264 _method_profiling_count = 0;
4265 _osr_link = nullptr;
4266 _method = nullptr;
4267 _immutable_data = nullptr;
4268 _pc_desc_container = nullptr;
4269 _exception_cache = nullptr;
4270 _gc_data = nullptr;
4271 _oops_do_mark_link = nullptr;
4272 _compiled_ic_data = nullptr;
4273 _osr_entry_point = nullptr;
4274 _compile_id = -1;
4275 _deoptimization_status = not_marked;
4276 _is_unloading_state = 0;
4277 _state = not_installed;
4278 }