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/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "compiler/oopMap.inline.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/barrierSetNMethod.hpp"
45 #include "gc/shared/classUnloadingContext.hpp"
46 #include "gc/shared/collectedHeap.hpp"
47 #include "interpreter/bytecode.inline.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/weakHandle.inline.hpp"
60 #include "prims/jvmtiImpl.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/orderAccess.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/serviceThread.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/threadWXSetters.inline.hpp"
77 #include "runtime/vmThread.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/dtrace.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/hashTable.hpp"
84 #include "utilities/xmlstream.hpp"
85 #if INCLUDE_JVMCI
86 #include "jvmci/jvmciRuntime.hpp"
87 #endif
88
89 #ifdef DTRACE_ENABLED
90
91 // Only bother with this argument setup if dtrace is available
92
93 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
94 { \
95 Method* m = (method); \
96 if (m != nullptr) { \
97 Symbol* klass_name = m->klass_name(); \
98 Symbol* name = m->name(); \
99 Symbol* signature = m->signature(); \
100 HOTSPOT_COMPILED_METHOD_UNLOAD( \
101 (char *) klass_name->bytes(), klass_name->utf8_length(), \
102 (char *) name->bytes(), name->utf8_length(), \
103 (char *) signature->bytes(), signature->utf8_length()); \
104 } \
105 }
106
107 #else // ndef DTRACE_ENABLED
108
109 #define DTRACE_METHOD_UNLOAD_PROBE(method)
110
111 #endif
112
113 // Cast from int value to narrow type
114 #define CHECKED_CAST(result, T, thing) \
115 result = static_cast<T>(thing); \
116 guarantee(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing);
117
118 //---------------------------------------------------------------------------------
119 // NMethod statistics
120 // They are printed under various flags, including:
121 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
122 // (In the latter two cases, they like other stats are printed to the log only.)
123
124 #ifndef PRODUCT
125 // These variables are put into one block to reduce relocations
126 // and make it simpler to print from the debugger.
127 struct java_nmethod_stats_struct {
128 uint nmethod_count;
129 uint total_nm_size;
130 uint total_immut_size;
131 uint total_mut_size;
132 uint relocation_size;
133 uint consts_size;
134 uint insts_size;
135 uint stub_size;
136 uint oops_size;
137 uint metadata_size;
138 uint dependencies_size;
139 uint nul_chk_table_size;
140 uint handler_table_size;
141 uint scopes_pcs_size;
142 uint scopes_data_size;
143 #if INCLUDE_JVMCI
144 uint speculations_size;
145 uint jvmci_data_size;
146 #endif
147
148 void note_nmethod(nmethod* nm) {
149 nmethod_count += 1;
150 total_nm_size += nm->size();
151 total_immut_size += nm->immutable_data_size();
152 total_mut_size += nm->mutable_data_size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 #if INCLUDE_JVMCI
165 speculations_size += nm->speculations_size();
166 jvmci_data_size += nm->jvmci_data_size();
167 #endif
168 }
169 void print_nmethod_stats(const char* name) {
170 if (nmethod_count == 0) return;
171 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
172 uint total_size = total_nm_size + total_immut_size + total_mut_size;
173 if (total_nm_size != 0) {
174 tty->print_cr(" total size = %u (100%%)", total_size);
175 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
176 }
177 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
178 if (nmethod_count != 0) {
179 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
180 }
181 if (consts_size != 0) {
182 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
183 }
184 if (insts_size != 0) {
185 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
186 }
187 if (stub_size != 0) {
188 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
189 }
190 if (oops_size != 0) {
191 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
192 }
193 if (total_mut_size != 0) {
194 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
195 }
196 if (relocation_size != 0) {
197 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
198 }
199 if (metadata_size != 0) {
200 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
201 }
202 #if INCLUDE_JVMCI
203 if (jvmci_data_size != 0) {
204 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_mut_size);
205 }
206 #endif
207 if (total_immut_size != 0) {
208 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
209 }
210 if (dependencies_size != 0) {
211 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
212 }
213 if (nul_chk_table_size != 0) {
214 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
215 }
216 if (handler_table_size != 0) {
217 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
218 }
219 if (scopes_pcs_size != 0) {
220 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
221 }
222 if (scopes_data_size != 0) {
223 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
224 }
225 #if INCLUDE_JVMCI
226 if (speculations_size != 0) {
227 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size);
228 }
229 #endif
230 }
231 };
232
233 struct native_nmethod_stats_struct {
234 uint native_nmethod_count;
235 uint native_total_size;
236 uint native_relocation_size;
237 uint native_insts_size;
238 uint native_oops_size;
239 uint native_metadata_size;
240 void note_native_nmethod(nmethod* nm) {
241 native_nmethod_count += 1;
242 native_total_size += nm->size();
243 native_relocation_size += nm->relocation_size();
244 native_insts_size += nm->insts_size();
245 native_oops_size += nm->oops_size();
246 native_metadata_size += nm->metadata_size();
247 }
248 void print_native_nmethod_stats() {
249 if (native_nmethod_count == 0) return;
250 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
251 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
252 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
253 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
254 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
255 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
256 }
257 };
258
259 struct pc_nmethod_stats_struct {
260 uint pc_desc_init; // number of initialization of cache (= number of caches)
261 uint pc_desc_queries; // queries to nmethod::find_pc_desc
262 uint pc_desc_approx; // number of those which have approximate true
263 uint pc_desc_repeats; // number of _pc_descs[0] hits
264 uint pc_desc_hits; // number of LRU cache hits
265 uint pc_desc_tests; // total number of PcDesc examinations
266 uint pc_desc_searches; // total number of quasi-binary search steps
267 uint pc_desc_adds; // number of LUR cache insertions
268
269 void print_pc_stats() {
270 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
271 pc_desc_queries,
272 (double)(pc_desc_tests + pc_desc_searches)
273 / pc_desc_queries);
274 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
275 pc_desc_init,
276 pc_desc_queries, pc_desc_approx,
277 pc_desc_repeats, pc_desc_hits,
278 pc_desc_tests, pc_desc_searches, pc_desc_adds);
279 }
280 };
281
282 #ifdef COMPILER1
283 static java_nmethod_stats_struct c1_java_nmethod_stats;
284 #endif
285 #ifdef COMPILER2
286 static java_nmethod_stats_struct c2_java_nmethod_stats;
287 #endif
288 #if INCLUDE_JVMCI
289 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
290 #endif
291 static java_nmethod_stats_struct unknown_java_nmethod_stats;
292
293 static native_nmethod_stats_struct native_nmethod_stats;
294 static pc_nmethod_stats_struct pc_nmethod_stats;
295
296 static void note_java_nmethod(nmethod* nm) {
297 #ifdef COMPILER1
298 if (nm->is_compiled_by_c1()) {
299 c1_java_nmethod_stats.note_nmethod(nm);
300 } else
301 #endif
302 #ifdef COMPILER2
303 if (nm->is_compiled_by_c2()) {
304 c2_java_nmethod_stats.note_nmethod(nm);
305 } else
306 #endif
307 #if INCLUDE_JVMCI
308 if (nm->is_compiled_by_jvmci()) {
309 jvmci_java_nmethod_stats.note_nmethod(nm);
310 } else
311 #endif
312 {
313 unknown_java_nmethod_stats.note_nmethod(nm);
314 }
315 }
316 #endif // !PRODUCT
317
318 //---------------------------------------------------------------------------------
319
320
321 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
322 assert(pc != nullptr, "Must be non null");
323 assert(exception.not_null(), "Must be non null");
324 assert(handler != nullptr, "Must be non null");
325
326 _count = 0;
327 _exception_type = exception->klass();
328 _next = nullptr;
329 _purge_list_next = nullptr;
330
331 add_address_and_handler(pc,handler);
332 }
333
334
335 address ExceptionCache::match(Handle exception, address pc) {
336 assert(pc != nullptr,"Must be non null");
337 assert(exception.not_null(),"Must be non null");
338 if (exception->klass() == exception_type()) {
339 return (test_address(pc));
340 }
341
342 return nullptr;
343 }
344
345
346 bool ExceptionCache::match_exception_with_space(Handle exception) {
347 assert(exception.not_null(),"Must be non null");
348 if (exception->klass() == exception_type() && count() < cache_size) {
349 return true;
350 }
351 return false;
352 }
353
354
355 address ExceptionCache::test_address(address addr) {
356 int limit = count();
357 for (int i = 0; i < limit; i++) {
358 if (pc_at(i) == addr) {
359 return handler_at(i);
360 }
361 }
362 return nullptr;
363 }
364
365
366 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
367 if (test_address(addr) == handler) return true;
368
369 int index = count();
370 if (index < cache_size) {
371 set_pc_at(index, addr);
372 set_handler_at(index, handler);
373 increment_count();
374 return true;
375 }
376 return false;
377 }
378
379 ExceptionCache* ExceptionCache::next() {
380 return Atomic::load(&_next);
381 }
382
383 void ExceptionCache::set_next(ExceptionCache *ec) {
384 Atomic::store(&_next, ec);
385 }
386
387 //-----------------------------------------------------------------------------
388
389
390 // Helper used by both find_pc_desc methods.
391 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
393 if (!approximate) {
394 return pc->pc_offset() == pc_offset;
395 } else {
396 // Do not look before the sentinel
397 assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
398 return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
399 }
400 }
401
402 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
403 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
404 // initialize the cache by filling it with benign (non-null) values
405 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
406 "must start with a sentinel");
407 for (int i = 0; i < cache_size; i++) {
408 _pc_descs[i] = initial_pc_desc;
409 }
410 }
411
412 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
413 // Note: one might think that caching the most recently
414 // read value separately would be a win, but one would be
415 // wrong. When many threads are updating it, the cache
416 // line it's in would bounce between caches, negating
417 // any benefit.
418
419 // In order to prevent race conditions do not load cache elements
420 // repeatedly, but use a local copy:
421 PcDesc* res;
422
423 // Step one: Check the most recently added value.
424 res = _pc_descs[0];
425 assert(res != nullptr, "PcDesc cache should be initialized already");
426
427 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
428 if (approximate && match_desc(res, pc_offset, approximate)) {
429 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
430 return res;
431 }
432
433 // Step two: Check the rest of the LRU cache.
434 for (int i = 1; i < cache_size; ++i) {
435 res = _pc_descs[i];
436 if (res->pc_offset() < 0) break; // optimization: skip empty cache
437 if (match_desc(res, pc_offset, approximate)) {
438 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
439 return res;
440 }
441 }
442
443 // Report failure.
444 return nullptr;
445 }
446
447 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
448 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
449 // Update the LRU cache by shifting pc_desc forward.
450 for (int i = 0; i < cache_size; i++) {
451 PcDesc* next = _pc_descs[i];
452 _pc_descs[i] = pc_desc;
453 pc_desc = next;
454 }
455 }
456
457 // adjust pcs_size so that it is a multiple of both oopSize and
458 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
459 // of oopSize, then 2*sizeof(PcDesc) is)
460 static int adjust_pcs_size(int pcs_size) {
461 int nsize = align_up(pcs_size, oopSize);
462 if ((nsize % sizeof(PcDesc)) != 0) {
463 nsize = pcs_size + sizeof(PcDesc);
464 }
465 assert((nsize % oopSize) == 0, "correct alignment");
466 return nsize;
467 }
468
469 bool nmethod::is_method_handle_return(address return_pc) {
470 if (!has_method_handle_invokes()) return false;
471 PcDesc* pd = pc_desc_at(return_pc);
472 if (pd == nullptr)
473 return false;
474 return pd->is_method_handle_invoke();
475 }
476
477 // Returns a string version of the method state.
478 const char* nmethod::state() const {
479 int state = get_state();
480 switch (state) {
481 case not_installed:
482 return "not installed";
483 case in_use:
484 return "in use";
485 case not_entrant:
486 return "not_entrant";
487 default:
488 fatal("unexpected method state: %d", state);
489 return nullptr;
490 }
491 }
492
493 void nmethod::set_deoptimized_done() {
494 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
495 if (_deoptimization_status != deoptimize_done) { // can't go backwards
496 Atomic::store(&_deoptimization_status, deoptimize_done);
497 }
498 }
499
500 ExceptionCache* nmethod::exception_cache_acquire() const {
501 return Atomic::load_acquire(&_exception_cache);
502 }
503
504 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
505 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
506 assert(new_entry != nullptr,"Must be non null");
507 assert(new_entry->next() == nullptr, "Must be null");
508
509 for (;;) {
510 ExceptionCache *ec = exception_cache();
511 if (ec != nullptr) {
512 Klass* ex_klass = ec->exception_type();
513 if (!ex_klass->is_loader_alive()) {
514 // We must guarantee that entries are not inserted with new next pointer
515 // edges to ExceptionCache entries with dead klasses, due to bad interactions
516 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
517 // the head pointer forward to the first live ExceptionCache, so that the new
518 // next pointers always point at live ExceptionCaches, that are not removed due
519 // to concurrent ExceptionCache cleanup.
520 ExceptionCache* next = ec->next();
521 if (Atomic::cmpxchg(&_exception_cache, ec, next) == ec) {
522 CodeCache::release_exception_cache(ec);
523 }
524 continue;
525 }
526 ec = exception_cache();
527 if (ec != nullptr) {
528 new_entry->set_next(ec);
529 }
530 }
531 if (Atomic::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
532 return;
533 }
534 }
535 }
536
537 void nmethod::clean_exception_cache() {
538 // For each nmethod, only a single thread may call this cleanup function
539 // at the same time, whether called in STW cleanup or concurrent cleanup.
540 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
541 // then a single writer may contend with cleaning up the head pointer to the
542 // first ExceptionCache node that has a Klass* that is alive. That is fine,
543 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
544 // And the concurrent writers do not clean up next pointers, only the head.
545 // Also note that concurrent readers will walk through Klass* pointers that are not
546 // alive. That does not cause ABA problems, because Klass* is deleted after
547 // a handshake with all threads, after all stale ExceptionCaches have been
548 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
549 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
550 // That similarly implies that CAS operations on ExceptionCache entries do not
551 // suffer from ABA problems as unlinking and deletion is separated by a global
552 // handshake operation.
553 ExceptionCache* prev = nullptr;
554 ExceptionCache* curr = exception_cache_acquire();
555
556 while (curr != nullptr) {
557 ExceptionCache* next = curr->next();
558
559 if (!curr->exception_type()->is_loader_alive()) {
560 if (prev == nullptr) {
561 // Try to clean head; this is contended by concurrent inserts, that
562 // both lazily clean the head, and insert entries at the head. If
563 // the CAS fails, the operation is restarted.
564 if (Atomic::cmpxchg(&_exception_cache, curr, next) != curr) {
565 prev = nullptr;
566 curr = exception_cache_acquire();
567 continue;
568 }
569 } else {
570 // It is impossible to during cleanup connect the next pointer to
571 // an ExceptionCache that has not been published before a safepoint
572 // prior to the cleanup. Therefore, release is not required.
573 prev->set_next(next);
574 }
575 // prev stays the same.
576
577 CodeCache::release_exception_cache(curr);
578 } else {
579 prev = curr;
580 }
581
582 curr = next;
583 }
584 }
585
586 // public method for accessing the exception cache
587 // These are the public access methods.
588 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
589 // We never grab a lock to read the exception cache, so we may
590 // have false negatives. This is okay, as it can only happen during
591 // the first few exception lookups for a given nmethod.
592 ExceptionCache* ec = exception_cache_acquire();
593 while (ec != nullptr) {
594 address ret_val;
595 if ((ret_val = ec->match(exception,pc)) != nullptr) {
596 return ret_val;
597 }
598 ec = ec->next();
599 }
600 return nullptr;
601 }
602
603 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
604 // There are potential race conditions during exception cache updates, so we
605 // must own the ExceptionCache_lock before doing ANY modifications. Because
606 // we don't lock during reads, it is possible to have several threads attempt
607 // to update the cache with the same data. We need to check for already inserted
608 // copies of the current data before adding it.
609
610 MutexLocker ml(ExceptionCache_lock);
611 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
612
613 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
614 target_entry = new ExceptionCache(exception,pc,handler);
615 add_exception_cache_entry(target_entry);
616 }
617 }
618
619 // private method for handling exception cache
620 // These methods are private, and used to manipulate the exception cache
621 // directly.
622 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
623 ExceptionCache* ec = exception_cache_acquire();
624 while (ec != nullptr) {
625 if (ec->match_exception_with_space(exception)) {
626 return ec;
627 }
628 ec = ec->next();
629 }
630 return nullptr;
631 }
632
633 bool nmethod::is_at_poll_return(address pc) {
634 RelocIterator iter(this, pc, pc+1);
635 while (iter.next()) {
636 if (iter.type() == relocInfo::poll_return_type)
637 return true;
638 }
639 return false;
640 }
641
642
643 bool nmethod::is_at_poll_or_poll_return(address pc) {
644 RelocIterator iter(this, pc, pc+1);
645 while (iter.next()) {
646 relocInfo::relocType t = iter.type();
647 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
648 return true;
649 }
650 return false;
651 }
652
653 void nmethod::verify_oop_relocations() {
654 // Ensure sure that the code matches the current oop values
655 RelocIterator iter(this, nullptr, nullptr);
656 while (iter.next()) {
657 if (iter.type() == relocInfo::oop_type) {
658 oop_Relocation* reloc = iter.oop_reloc();
659 if (!reloc->oop_is_immediate()) {
660 reloc->verify_oop_relocation();
661 }
662 }
663 }
664 }
665
666
667 ScopeDesc* nmethod::scope_desc_at(address pc) {
668 PcDesc* pd = pc_desc_at(pc);
669 guarantee(pd != nullptr, "scope must be present");
670 return new ScopeDesc(this, pd);
671 }
672
673 ScopeDesc* nmethod::scope_desc_near(address pc) {
674 PcDesc* pd = pc_desc_near(pc);
675 guarantee(pd != nullptr, "scope must be present");
676 return new ScopeDesc(this, pd);
677 }
678
679 address nmethod::oops_reloc_begin() const {
680 // If the method is not entrant then a JMP is plastered over the
681 // first few bytes. If an oop in the old code was there, that oop
682 // should not get GC'd. Skip the first few bytes of oops on
683 // not-entrant methods.
684 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
685 code_begin() + frame_complete_offset() >
686 verified_entry_point() + NativeJump::instruction_size)
687 {
688 // If we have a frame_complete_offset after the native jump, then there
689 // is no point trying to look for oops before that. This is a requirement
690 // for being allowed to scan oops concurrently.
691 return code_begin() + frame_complete_offset();
692 }
693
694 address low_boundary = verified_entry_point();
695 return low_boundary;
696 }
697
698 // Method that knows how to preserve outgoing arguments at call. This method must be
699 // called with a frame corresponding to a Java invoke
700 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
701 if (method() == nullptr) {
702 return;
703 }
704
705 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
706 JavaThread* thread = reg_map->thread();
707 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
708 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
709 return;
710 }
711
712 if (!method()->is_native()) {
713 address pc = fr.pc();
714 bool has_receiver, has_appendix;
715 Symbol* signature;
716
717 // The method attached by JIT-compilers should be used, if present.
718 // Bytecode can be inaccurate in such case.
719 Method* callee = attached_method_before_pc(pc);
720 if (callee != nullptr) {
721 has_receiver = !(callee->access_flags().is_static());
722 has_appendix = false;
723 signature = callee->signature();
724 } else {
725 SimpleScopeDesc ssd(this, pc);
726
727 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
728 has_receiver = call.has_receiver();
729 has_appendix = call.has_appendix();
730 signature = call.signature();
731 }
732
733 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
734 } else if (method()->is_continuation_enter_intrinsic()) {
735 // This method only calls Continuation.enter()
736 Symbol* signature = vmSymbols::continuationEnter_signature();
737 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
738 }
739 }
740
741 Method* nmethod::attached_method(address call_instr) {
742 assert(code_contains(call_instr), "not part of the nmethod");
743 RelocIterator iter(this, call_instr, call_instr + 1);
744 while (iter.next()) {
745 if (iter.addr() == call_instr) {
746 switch(iter.type()) {
747 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
748 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
749 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
750 default: break;
751 }
752 }
753 }
754 return nullptr; // not found
755 }
756
757 Method* nmethod::attached_method_before_pc(address pc) {
758 if (NativeCall::is_call_before(pc)) {
759 NativeCall* ncall = nativeCall_before(pc);
760 return attached_method(ncall->instruction_address());
761 }
762 return nullptr; // not a call
763 }
764
765 void nmethod::clear_inline_caches() {
766 assert(SafepointSynchronize::is_at_safepoint(), "clearing of IC's only allowed at safepoint");
767 RelocIterator iter(this);
768 while (iter.next()) {
769 iter.reloc()->clear_inline_cache();
770 }
771 }
772
773 #ifdef ASSERT
774 // Check class_loader is alive for this bit of metadata.
775 class CheckClass : public MetadataClosure {
776 void do_metadata(Metadata* md) {
777 Klass* klass = nullptr;
778 if (md->is_klass()) {
779 klass = ((Klass*)md);
780 } else if (md->is_method()) {
781 klass = ((Method*)md)->method_holder();
782 } else if (md->is_methodData()) {
783 klass = ((MethodData*)md)->method()->method_holder();
784 } else if (md->is_methodCounters()) {
785 klass = ((MethodCounters*)md)->method()->method_holder();
786 } else {
787 md->print();
788 ShouldNotReachHere();
789 }
790 assert(klass->is_loader_alive(), "must be alive");
791 }
792 };
793 #endif // ASSERT
794
795
796 static void clean_ic_if_metadata_is_dead(CompiledIC *ic) {
797 ic->clean_metadata();
798 }
799
800 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
801 template <typename CallsiteT>
802 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, nmethod* from,
803 bool clean_all) {
804 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
805 if (!cb->is_nmethod()) {
806 return;
807 }
808 nmethod* nm = cb->as_nmethod();
809 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
810 callsite->set_to_clean();
811 }
812 }
813
814 // Cleans caches in nmethods that point to either classes that are unloaded
815 // or nmethods that are unloaded.
816 //
817 // Can be called either in parallel by G1 currently or after all
818 // nmethods are unloaded. Return postponed=true in the parallel case for
819 // inline caches found that point to nmethods that are not yet visited during
820 // the do_unloading walk.
821 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
822 ResourceMark rm;
823
824 // Exception cache only needs to be called if unloading occurred
825 if (unloading_occurred) {
826 clean_exception_cache();
827 }
828
829 cleanup_inline_caches_impl(unloading_occurred, false);
830
831 #ifdef ASSERT
832 // Check that the metadata embedded in the nmethod is alive
833 CheckClass check_class;
834 metadata_do(&check_class);
835 #endif
836 }
837
838 void nmethod::run_nmethod_entry_barrier() {
839 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
840 if (bs_nm != nullptr) {
841 // We want to keep an invariant that nmethods found through iterations of a Thread's
842 // nmethods found in safepoints have gone through an entry barrier and are not armed.
843 // By calling this nmethod entry barrier, it plays along and acts
844 // like any other nmethod found on the stack of a thread (fewer surprises).
845 nmethod* nm = this;
846 bool alive = bs_nm->nmethod_entry_barrier(nm);
847 assert(alive, "should be alive");
848 }
849 }
850
851 // Only called by whitebox test
852 void nmethod::cleanup_inline_caches_whitebox() {
853 assert_locked_or_safepoint(CodeCache_lock);
854 CompiledICLocker ic_locker(this);
855 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
856 }
857
858 address* nmethod::orig_pc_addr(const frame* fr) {
859 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
860 }
861
862 // Called to clean up after class unloading for live nmethods
863 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
864 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
865 ResourceMark rm;
866
867 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
868 RelocIterator iter(this, oops_reloc_begin());
869 bool is_in_static_stub = false;
870 while(iter.next()) {
871
872 switch (iter.type()) {
873
874 case relocInfo::virtual_call_type:
875 if (unloading_occurred) {
876 // If class unloading occurred we first clear ICs where the cached metadata
877 // is referring to an unloaded klass or method.
878 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter));
879 }
880
881 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, clean_all);
882 break;
883
884 case relocInfo::opt_virtual_call_type:
885 case relocInfo::static_call_type:
886 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), this, clean_all);
887 break;
888
889 case relocInfo::static_stub_type: {
890 is_in_static_stub = true;
891 break;
892 }
893
894 case relocInfo::metadata_type: {
895 // Only the metadata relocations contained in static/opt virtual call stubs
896 // contains the Method* passed to c2i adapters. It is the only metadata
897 // relocation that needs to be walked, as it is the one metadata relocation
898 // that violates the invariant that all metadata relocations have an oop
899 // in the compiled method (due to deferred resolution and code patching).
900
901 // This causes dead metadata to remain in compiled methods that are not
902 // unloading. Unless these slippery metadata relocations of the static
903 // stubs are at least cleared, subsequent class redefinition operations
904 // will access potentially free memory, and JavaThread execution
905 // concurrent to class unloading may call c2i adapters with dead methods.
906 if (!is_in_static_stub) {
907 // The first metadata relocation after a static stub relocation is the
908 // metadata relocation of the static stub used to pass the Method* to
909 // c2i adapters.
910 continue;
911 }
912 is_in_static_stub = false;
913 if (is_unloading()) {
914 // If the nmethod itself is dying, then it may point at dead metadata.
915 // Nobody should follow that metadata; it is strictly unsafe.
916 continue;
917 }
918 metadata_Relocation* r = iter.metadata_reloc();
919 Metadata* md = r->metadata_value();
920 if (md != nullptr && md->is_method()) {
921 Method* method = static_cast<Method*>(md);
922 if (!method->method_holder()->is_loader_alive()) {
923 Atomic::store(r->metadata_addr(), (Method*)nullptr);
924
925 if (!r->metadata_is_immediate()) {
926 r->fix_metadata_relocation();
927 }
928 }
929 }
930 break;
931 }
932
933 default:
934 break;
935 }
936 }
937 }
938
939 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
940 // Exception happened outside inline-cache check code => we are inside
941 // an active nmethod => use cpc to determine a return address
942 int exception_offset = int(pc - code_begin());
943 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
944 #ifdef ASSERT
945 if (cont_offset == 0) {
946 Thread* thread = Thread::current();
947 ResourceMark rm(thread);
948 CodeBlob* cb = CodeCache::find_blob(pc);
949 assert(cb != nullptr && cb == this, "");
950
951 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
952 stringStream ss;
953 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
954 print_on(&ss);
955 method()->print_codes_on(&ss);
956 print_code_on(&ss);
957 print_pcs_on(&ss);
958 tty->print("%s", ss.as_string()); // print all at once
959 }
960 #endif
961 if (cont_offset == 0) {
962 // Let the normal error handling report the exception
963 return nullptr;
964 }
965 if (cont_offset == exception_offset) {
966 #if INCLUDE_JVMCI
967 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
968 JavaThread *thread = JavaThread::current();
969 thread->set_jvmci_implicit_exception_pc(pc);
970 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
971 Deoptimization::Action_reinterpret));
972 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
973 #else
974 ShouldNotReachHere();
975 #endif
976 }
977 return code_begin() + cont_offset;
978 }
979
980 class HasEvolDependency : public MetadataClosure {
981 bool _has_evol_dependency;
982 public:
983 HasEvolDependency() : _has_evol_dependency(false) {}
984 void do_metadata(Metadata* md) {
985 if (md->is_method()) {
986 Method* method = (Method*)md;
987 if (method->is_old()) {
988 _has_evol_dependency = true;
989 }
990 }
991 }
992 bool has_evol_dependency() const { return _has_evol_dependency; }
993 };
994
995 bool nmethod::has_evol_metadata() {
996 // Check the metadata in relocIter and CompiledIC and also deoptimize
997 // any nmethod that has reference to old methods.
998 HasEvolDependency check_evol;
999 metadata_do(&check_evol);
1000 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
1001 ResourceMark rm;
1002 log_debug(redefine, class, nmethod)
1003 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
1004 _method->method_holder()->external_name(),
1005 _method->name()->as_C_string(),
1006 _method->signature()->as_C_string(),
1007 compile_id());
1008 }
1009 return check_evol.has_evol_dependency();
1010 }
1011
1012 int nmethod::total_size() const {
1013 return
1014 consts_size() +
1015 insts_size() +
1016 stub_size() +
1017 scopes_data_size() +
1018 scopes_pcs_size() +
1019 handler_table_size() +
1020 nul_chk_table_size();
1021 }
1022
1023 const char* nmethod::compile_kind() const {
1024 if (is_osr_method()) return "osr";
1025 if (preloaded()) return "AP";
1026 if (is_aot()) return "A";
1027
1028 if (method() != nullptr && is_native_method()) {
1029 if (method()->is_continuation_native_intrinsic()) {
1030 return "cnt";
1031 }
1032 return "c2n";
1033 }
1034 return nullptr;
1035 }
1036
1037 const char* nmethod::compiler_name() const {
1038 return compilertype2name(_compiler_type);
1039 }
1040
1041 #ifdef ASSERT
1042 class CheckForOopsClosure : public OopClosure {
1043 bool _found_oop = false;
1044 public:
1045 virtual void do_oop(oop* o) { _found_oop = true; }
1046 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1047 bool found_oop() { return _found_oop; }
1048 };
1049 class CheckForMetadataClosure : public MetadataClosure {
1050 bool _found_metadata = false;
1051 Metadata* _ignore = nullptr;
1052 public:
1053 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1054 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1055 bool found_metadata() { return _found_metadata; }
1056 };
1057
1058 static void assert_no_oops_or_metadata(nmethod* nm) {
1059 if (nm == nullptr) return;
1060 assert(nm->oop_maps() == nullptr, "expectation");
1061
1062 CheckForOopsClosure cfo;
1063 nm->oops_do(&cfo);
1064 assert(!cfo.found_oop(), "no oops allowed");
1065
1066 // We allow an exception for the own Method, but require its class to be permanent.
1067 Method* own_method = nm->method();
1068 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1069 nm->metadata_do(&cfm);
1070 assert(!cfm.found_metadata(), "no metadata allowed");
1071
1072 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1073 "Method's class needs to be permanent");
1074 }
1075 #endif
1076
1077 static int required_mutable_data_size(CodeBuffer* code_buffer,
1078 int jvmci_data_size = 0) {
1079 return align_up(code_buffer->total_relocation_size(), oopSize) +
1080 align_up(code_buffer->total_metadata_size(), oopSize) +
1081 align_up(jvmci_data_size, oopSize);
1082 }
1083
1084 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1085 int compile_id,
1086 CodeBuffer *code_buffer,
1087 int vep_offset,
1088 int frame_complete,
1089 int frame_size,
1090 ByteSize basic_lock_owner_sp_offset,
1091 ByteSize basic_lock_sp_offset,
1092 OopMapSet* oop_maps,
1093 int exception_handler) {
1094 code_buffer->finalize_oop_references(method);
1095 // create nmethod
1096 nmethod* nm = nullptr;
1097 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1098 {
1099 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1100
1101 CodeOffsets offsets;
1102 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1103 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1104 if (exception_handler != -1) {
1105 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1106 }
1107
1108 int mutable_data_size = required_mutable_data_size(code_buffer);
1109
1110 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1111 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1112 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1113 nm = new (native_nmethod_size, allow_NonNMethod_space)
1114 nmethod(method(), compiler_none, native_nmethod_size,
1115 compile_id, &offsets,
1116 code_buffer, frame_size,
1117 basic_lock_owner_sp_offset,
1118 basic_lock_sp_offset,
1119 oop_maps, mutable_data_size);
1120 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1121 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1122 }
1123
1124 if (nm != nullptr) {
1125 // verify nmethod
1126 DEBUG_ONLY(nm->verify();) // might block
1127
1128 nm->log_new_nmethod();
1129 }
1130 return nm;
1131 }
1132
1133 void nmethod::record_nmethod_dependency() {
1134 // To make dependency checking during class loading fast, record
1135 // the nmethod dependencies in the classes it is dependent on.
1136 // This allows the dependency checking code to simply walk the
1137 // class hierarchy above the loaded class, checking only nmethods
1138 // which are dependent on those classes. The slow way is to
1139 // check every nmethod for dependencies which makes it linear in
1140 // the number of methods compiled. For applications with a lot
1141 // classes the slow way is too slow.
1142 for (Dependencies::DepStream deps(this); deps.next(); ) {
1143 if (deps.type() == Dependencies::call_site_target_value) {
1144 // CallSite dependencies are managed on per-CallSite instance basis.
1145 oop call_site = deps.argument_oop(0);
1146 MethodHandles::add_dependent_nmethod(call_site, this);
1147 } else {
1148 InstanceKlass* ik = deps.context_type();
1149 if (ik == nullptr) {
1150 continue; // ignore things like evol_method
1151 }
1152 // record this nmethod as dependent on this klass
1153 ik->add_dependent_nmethod(this);
1154 }
1155 }
1156 }
1157
1158 nmethod* nmethod::new_nmethod(const methodHandle& method,
1159 int compile_id,
1160 int entry_bci,
1161 CodeOffsets* offsets,
1162 int orig_pc_offset,
1163 DebugInformationRecorder* debug_info,
1164 Dependencies* dependencies,
1165 CodeBuffer* code_buffer, int frame_size,
1166 OopMapSet* oop_maps,
1167 ExceptionHandlerTable* handler_table,
1168 ImplicitExceptionTable* nul_chk_table,
1169 AbstractCompiler* compiler,
1170 CompLevel comp_level
1171 , AOTCodeEntry* aot_code_entry
1172 #if INCLUDE_JVMCI
1173 , char* speculations,
1174 int speculations_len,
1175 JVMCINMethodData* jvmci_data
1176 #endif
1177 )
1178 {
1179 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1180 code_buffer->finalize_oop_references(method);
1181 // create nmethod
1182 nmethod* nm = nullptr;
1183 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1184
1185 int immutable_data_size =
1186 adjust_pcs_size(debug_info->pcs_size())
1187 + align_up((int)dependencies->size_in_bytes(), oopSize)
1188 + align_up(handler_table->size_in_bytes() , oopSize)
1189 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1190 #if INCLUDE_JVMCI
1191 + align_up(speculations_len , oopSize)
1192 #endif
1193 + align_up(debug_info->data_size() , oopSize);
1194
1195 // First, allocate space for immutable data in C heap.
1196 address immutable_data = nullptr;
1197 if (immutable_data_size > 0) {
1198 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1199 if (immutable_data == nullptr) {
1200 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1201 return nullptr;
1202 }
1203 }
1204
1205 int mutable_data_size = required_mutable_data_size(code_buffer
1206 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1207
1208 {
1209 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1210
1211 nm = new (nmethod_size, comp_level)
1212 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1213 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1214 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1215 handler_table, nul_chk_table, compiler, comp_level, aot_code_entry
1216 #if INCLUDE_JVMCI
1217 , speculations,
1218 speculations_len,
1219 jvmci_data
1220 #endif
1221 );
1222
1223 if (nm != nullptr) {
1224 nm->record_nmethod_dependency();
1225 NOT_PRODUCT(note_java_nmethod(nm));
1226 }
1227 }
1228 // Do verification and logging outside CodeCache_lock.
1229 if (nm != nullptr) {
1230
1231 #ifdef ASSERT
1232 LogTarget(Debug, aot, codecache, nmethod) log;
1233 if (log.is_enabled()) {
1234 LogStream out(log);
1235 out.print_cr("== new_nmethod 2");
1236 FlagSetting fs(PrintRelocations, true);
1237 nm->print_on_impl(&out);
1238 nm->decode(&out);
1239 }
1240 #endif
1241
1242 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1243 DEBUG_ONLY(nm->verify();)
1244 nm->log_new_nmethod();
1245 }
1246 return nm;
1247 }
1248
1249 nmethod* nmethod::restore(address code_cache_buffer,
1250 const methodHandle& method,
1251 int compile_id,
1252 address reloc_data,
1253 GrowableArray<Handle>& oop_list,
1254 GrowableArray<Metadata*>& metadata_list,
1255 ImmutableOopMapSet* oop_maps,
1256 address immutable_data,
1257 GrowableArray<Handle>& reloc_imm_oop_list,
1258 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1259 AOTCodeReader* aot_code_reader)
1260 {
1261 CodeBlob::restore(code_cache_buffer, "nmethod", reloc_data, oop_maps);
1262 nmethod* nm = (nmethod*)code_cache_buffer;
1263 nm->set_method(method());
1264 nm->_compile_id = compile_id;
1265 nm->set_immutable_data(immutable_data);
1266 nm->copy_values(&oop_list);
1267 nm->copy_values(&metadata_list);
1268
1269 aot_code_reader->fix_relocations(nm, &reloc_imm_oop_list, &reloc_imm_metadata_list);
1270
1271 #ifndef PRODUCT
1272 nm->asm_remarks().init();
1273 aot_code_reader->read_asm_remarks(nm->asm_remarks(), /* use_string_table */ false);
1274 nm->dbg_strings().init();
1275 aot_code_reader->read_dbg_strings(nm->dbg_strings(), /* use_string_table */ false);
1276 #endif
1277
1278 // Flush the code block
1279 ICache::invalidate_range(nm->code_begin(), nm->code_size());
1280
1281 // Create cache after PcDesc data is copied - it will be used to initialize cache
1282 nm->_pc_desc_container = new PcDescContainer(nm->scopes_pcs_begin());
1283
1284 nm->set_aot_code_entry(aot_code_reader->aot_code_entry());
1285
1286 nm->post_init();
1287 return nm;
1288 }
1289
1290 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1291 const methodHandle& method,
1292 AbstractCompiler* compiler,
1293 int compile_id,
1294 address reloc_data,
1295 GrowableArray<Handle>& oop_list,
1296 GrowableArray<Metadata*>& metadata_list,
1297 ImmutableOopMapSet* oop_maps,
1298 address immutable_data,
1299 GrowableArray<Handle>& reloc_imm_oop_list,
1300 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1301 AOTCodeReader* aot_code_reader)
1302 {
1303 nmethod* nm = nullptr;
1304 int nmethod_size = archived_nm->size();
1305 // create nmethod
1306 {
1307 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1308 address code_cache_buffer = (address)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1309 if (code_cache_buffer != nullptr) {
1310 nm = archived_nm->restore(code_cache_buffer,
1311 method,
1312 compile_id,
1313 reloc_data,
1314 oop_list,
1315 metadata_list,
1316 oop_maps,
1317 immutable_data,
1318 reloc_imm_oop_list,
1319 reloc_imm_metadata_list,
1320 aot_code_reader);
1321 nm->record_nmethod_dependency();
1322 NOT_PRODUCT(note_java_nmethod(nm));
1323 }
1324 }
1325 // Do verification and logging outside CodeCache_lock.
1326 if (nm != nullptr) {
1327 #ifdef ASSERT
1328 LogTarget(Debug, aot, codecache, nmethod) log;
1329 if (log.is_enabled()) {
1330 LogStream out(log);
1331 out.print_cr("== new_nmethod 2");
1332 FlagSetting fs(PrintRelocations, true);
1333 nm->print_on_impl(&out);
1334 nm->decode(&out);
1335 }
1336 #endif
1337 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1338 DEBUG_ONLY(nm->verify();)
1339 nm->log_new_nmethod();
1340 }
1341 return nm;
1342 }
1343
1344 // Fill in default values for various fields
1345 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1346 // avoid uninitialized fields, even for short time periods
1347 _exception_cache = nullptr;
1348 _gc_data = nullptr;
1349 _oops_do_mark_link = nullptr;
1350 _compiled_ic_data = nullptr;
1351
1352 _is_unloading_state = 0;
1353 _state = not_installed;
1354
1355 _has_unsafe_access = 0;
1356 _has_method_handle_invokes = 0;
1357 _has_wide_vectors = 0;
1358 _has_monitors = 0;
1359 _has_scoped_access = 0;
1360 _has_flushed_dependencies = 0;
1361 _is_unlinked = 0;
1362 _load_reported = 0; // jvmti state
1363 _preloaded = 0;
1364 _has_clinit_barriers = 0;
1365
1366 _used = false;
1367 _deoptimization_status = not_marked;
1368
1369 // SECT_CONSTS is first in code buffer so the offset should be 0.
1370 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1371 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1372
1373 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1374
1375 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1376 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1377
1378 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1379 }
1380
1381 // Post initialization
1382 void nmethod::post_init() {
1383 clear_unloading_state();
1384
1385 finalize_relocations();
1386
1387 Universe::heap()->register_nmethod(this);
1388 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1389
1390 CodeCache::commit(this);
1391 }
1392
1393 // For native wrappers
1394 nmethod::nmethod(
1395 Method* method,
1396 CompilerType type,
1397 int nmethod_size,
1398 int compile_id,
1399 CodeOffsets* offsets,
1400 CodeBuffer* code_buffer,
1401 int frame_size,
1402 ByteSize basic_lock_owner_sp_offset,
1403 ByteSize basic_lock_sp_offset,
1404 OopMapSet* oop_maps,
1405 int mutable_data_size)
1406 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1407 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1408 _deoptimization_generation(0),
1409 _gc_epoch(CodeCache::gc_epoch()),
1410 _method(method),
1411 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1412 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1413 {
1414 {
1415 DEBUG_ONLY(NoSafepointVerifier nsv;)
1416 assert_locked_or_safepoint(CodeCache_lock);
1417
1418 init_defaults(code_buffer, offsets);
1419
1420 _osr_entry_point = nullptr;
1421 _pc_desc_container = nullptr;
1422 _entry_bci = InvocationEntryBci;
1423 _compile_id = compile_id;
1424 _comp_level = CompLevel_none;
1425 _compiler_type = type;
1426 _orig_pc_offset = 0;
1427 _num_stack_arg_slots = 0;
1428
1429 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1430 // Continuation enter intrinsic
1431 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1432 } else {
1433 _exception_offset = 0;
1434 }
1435 // Native wrappers do not have deopt handlers. Make the values
1436 // something that will never match a pc like the nmethod vtable entry
1437 _deopt_handler_offset = 0;
1438 _deopt_mh_handler_offset = 0;
1439 _aot_code_entry = nullptr;
1440 _method_profiling_count = 0;
1441 _unwind_handler_offset = 0;
1442
1443 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1444 uint16_t metadata_size;
1445 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1446 JVMCI_ONLY( _metadata_size = metadata_size; )
1447 assert(_mutable_data_size == _relocation_size + metadata_size,
1448 "wrong mutable data size: %d != %d + %d",
1449 _mutable_data_size, _relocation_size, metadata_size);
1450
1451 // native wrapper does not have read-only data but we need unique not null address
1452 _immutable_data = blob_end();
1453 _immutable_data_size = 0;
1454 _nul_chk_table_offset = 0;
1455 _handler_table_offset = 0;
1456 _scopes_pcs_offset = 0;
1457 _scopes_data_offset = 0;
1458 #if INCLUDE_JVMCI
1459 _speculations_offset = 0;
1460 #endif
1461
1462 code_buffer->copy_code_and_locs_to(this);
1463 code_buffer->copy_values_to(this);
1464
1465 post_init();
1466 }
1467
1468 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1469 ttyLocker ttyl; // keep the following output all in one block
1470 // This output goes directly to the tty, not the compiler log.
1471 // To enable tools to match it up with the compilation activity,
1472 // be sure to tag this tty output with the compile ID.
1473 if (xtty != nullptr) {
1474 xtty->begin_head("print_native_nmethod");
1475 xtty->method(_method);
1476 xtty->stamp();
1477 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1478 }
1479 // Print the header part, then print the requested information.
1480 // This is both handled in decode2(), called via print_code() -> decode()
1481 if (PrintNativeNMethods) {
1482 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1483 print_code();
1484 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1485 #if defined(SUPPORT_DATA_STRUCTS)
1486 if (AbstractDisassembler::show_structs()) {
1487 if (oop_maps != nullptr) {
1488 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1489 oop_maps->print_on(tty);
1490 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1491 }
1492 }
1493 #endif
1494 } else {
1495 print(); // print the header part only.
1496 }
1497 #if defined(SUPPORT_DATA_STRUCTS)
1498 if (AbstractDisassembler::show_structs()) {
1499 if (PrintRelocations) {
1500 print_relocations_on(tty);
1501 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1502 }
1503 }
1504 #endif
1505 if (xtty != nullptr) {
1506 xtty->tail("print_native_nmethod");
1507 }
1508 }
1509 }
1510
1511 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1512 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1513 }
1514
1515 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1516 // Try MethodNonProfiled and MethodProfiled.
1517 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1518 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1519 // Try NonNMethod or give up.
1520 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1521 }
1522
1523 // For normal JIT compiled code
1524 nmethod::nmethod(
1525 Method* method,
1526 CompilerType type,
1527 int nmethod_size,
1528 int immutable_data_size,
1529 int mutable_data_size,
1530 int compile_id,
1531 int entry_bci,
1532 address immutable_data,
1533 CodeOffsets* offsets,
1534 int orig_pc_offset,
1535 DebugInformationRecorder* debug_info,
1536 Dependencies* dependencies,
1537 CodeBuffer *code_buffer,
1538 int frame_size,
1539 OopMapSet* oop_maps,
1540 ExceptionHandlerTable* handler_table,
1541 ImplicitExceptionTable* nul_chk_table,
1542 AbstractCompiler* compiler,
1543 CompLevel comp_level
1544 , AOTCodeEntry* aot_code_entry
1545 #if INCLUDE_JVMCI
1546 , char* speculations,
1547 int speculations_len,
1548 JVMCINMethodData* jvmci_data
1549 #endif
1550 )
1551 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1552 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1553 _deoptimization_generation(0),
1554 _gc_epoch(CodeCache::gc_epoch()),
1555 _method(method),
1556 _osr_link(nullptr)
1557 {
1558 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1559 {
1560 DEBUG_ONLY(NoSafepointVerifier nsv;)
1561 assert_locked_or_safepoint(CodeCache_lock);
1562
1563 init_defaults(code_buffer, offsets);
1564 _aot_code_entry = aot_code_entry;
1565 _method_profiling_count = 0;
1566
1567 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1568 _entry_bci = entry_bci;
1569 _compile_id = compile_id;
1570 _comp_level = comp_level;
1571 _compiler_type = type;
1572 _orig_pc_offset = orig_pc_offset;
1573
1574 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1575
1576 set_ctable_begin(header_begin() + content_offset());
1577
1578 #if INCLUDE_JVMCI
1579 if (compiler->is_jvmci()) {
1580 // JVMCI might not produce any stub sections
1581 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1582 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1583 } else {
1584 _exception_offset = -1;
1585 }
1586 if (offsets->value(CodeOffsets::Deopt) != -1) {
1587 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1588 } else {
1589 _deopt_handler_offset = -1;
1590 }
1591 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1592 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
1593 } else {
1594 _deopt_mh_handler_offset = -1;
1595 }
1596 } else
1597 #endif
1598 {
1599 // Exception handler and deopt handler are in the stub section
1600 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1601 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1602
1603 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1604 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1605 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1606 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
1607 } else {
1608 _deopt_mh_handler_offset = -1;
1609 }
1610 }
1611 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1612 // C1 generates UnwindHandler at the end of instructions section.
1613 // Calculate positive offset as distance between the start of stubs section
1614 // (which is also the end of instructions section) and the start of the handler.
1615 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1616 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1617 } else {
1618 _unwind_handler_offset = -1;
1619 }
1620
1621 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1622 uint16_t metadata_size;
1623 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1624 JVMCI_ONLY( _metadata_size = metadata_size; )
1625 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1626 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1627 "wrong mutable data size: %d != %d + %d + %d",
1628 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1629 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1630 nmethod_size, (int)(code_end() - header_begin()));
1631
1632 _immutable_data_size = immutable_data_size;
1633 if (immutable_data_size > 0) {
1634 assert(immutable_data != nullptr, "required");
1635 _immutable_data = immutable_data;
1636 } else {
1637 // We need unique not null address
1638 _immutable_data = blob_end();
1639 }
1640 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1641 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1642 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1643 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1644
1645 #if INCLUDE_JVMCI
1646 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1647 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); )
1648 #else
1649 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); )
1650 #endif
1651 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1652 immutable_data_end_offset, immutable_data_size);
1653
1654 // Copy code and relocation info
1655 code_buffer->copy_code_and_locs_to(this);
1656 // Copy oops and metadata
1657 code_buffer->copy_values_to(this);
1658 dependencies->copy_to(this);
1659 // Copy PcDesc and ScopeDesc data
1660 debug_info->copy_to(this);
1661
1662 // Create cache after PcDesc data is copied - it will be used to initialize cache
1663 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1664
1665 #if INCLUDE_JVMCI
1666 if (compiler->is_jvmci()) {
1667 // Initialize the JVMCINMethodData object inlined into nm
1668 jvmci_nmethod_data()->copy(jvmci_data);
1669 }
1670 #endif
1671
1672 // Copy contents of ExceptionHandlerTable to nmethod
1673 handler_table->copy_to(this);
1674 nul_chk_table->copy_to(this);
1675
1676 #if INCLUDE_JVMCI
1677 // Copy speculations to nmethod
1678 if (speculations_size() != 0) {
1679 memcpy(speculations_begin(), speculations, speculations_len);
1680 }
1681 #endif
1682
1683 post_init();
1684
1685 // we use the information of entry points to find out if a method is
1686 // static or non static
1687 assert(compiler->is_c2() || compiler->is_jvmci() ||
1688 _method->is_static() == (entry_point() == verified_entry_point()),
1689 " entry points must be same for static methods and vice versa");
1690 }
1691 }
1692
1693 // Print a short set of xml attributes to identify this nmethod. The
1694 // output should be embedded in some other element.
1695 void nmethod::log_identity(xmlStream* log) const {
1696 assert(log->inside_attrs_or_error(), "printing attributes");
1697 log->print(" compile_id='%d'", compile_id());
1698 const char* nm_kind = compile_kind();
1699 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1700 log->print(" compiler='%s'", compiler_name());
1701 if (TieredCompilation) {
1702 log->print(" compile_level='%d'", comp_level());
1703 }
1704 #if INCLUDE_JVMCI
1705 if (jvmci_nmethod_data() != nullptr) {
1706 const char* jvmci_name = jvmci_nmethod_data()->name();
1707 if (jvmci_name != nullptr) {
1708 log->print(" jvmci_mirror_name='");
1709 log->text("%s", jvmci_name);
1710 log->print("'");
1711 }
1712 }
1713 #endif
1714 }
1715
1716
1717 #define LOG_OFFSET(log, name) \
1718 if (p2i(name##_end()) - p2i(name##_begin())) \
1719 log->print(" " XSTR(name) "_offset='%zd'" , \
1720 p2i(name##_begin()) - p2i(this))
1721
1722
1723 void nmethod::log_new_nmethod() const {
1724 if (LogCompilation && xtty != nullptr) {
1725 ttyLocker ttyl;
1726 xtty->begin_elem("nmethod");
1727 log_identity(xtty);
1728 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1729 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1730
1731 LOG_OFFSET(xtty, relocation);
1732 LOG_OFFSET(xtty, consts);
1733 LOG_OFFSET(xtty, insts);
1734 LOG_OFFSET(xtty, stub);
1735 LOG_OFFSET(xtty, scopes_data);
1736 LOG_OFFSET(xtty, scopes_pcs);
1737 LOG_OFFSET(xtty, dependencies);
1738 LOG_OFFSET(xtty, handler_table);
1739 LOG_OFFSET(xtty, nul_chk_table);
1740 LOG_OFFSET(xtty, oops);
1741 LOG_OFFSET(xtty, metadata);
1742
1743 xtty->method(method());
1744 xtty->stamp();
1745 xtty->end_elem();
1746 }
1747 }
1748
1749 #undef LOG_OFFSET
1750
1751
1752 // Print out more verbose output usually for a newly created nmethod.
1753 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1754 if (st != nullptr) {
1755 ttyLocker ttyl;
1756 if (WizardMode) {
1757 CompileTask::print(st, this, msg, /*short_form:*/ true);
1758 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1759 } else {
1760 CompileTask::print(st, this, msg, /*short_form:*/ false);
1761 }
1762 }
1763 }
1764
1765 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1766 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1767 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1768 print_nmethod(printnmethods);
1769 }
1770 }
1771
1772 void nmethod::print_nmethod(bool printmethod) {
1773 ttyLocker ttyl; // keep the following output all in one block
1774 if (xtty != nullptr) {
1775 xtty->begin_head("print_nmethod");
1776 log_identity(xtty);
1777 xtty->stamp();
1778 xtty->end_head();
1779 }
1780 // Print the header part, then print the requested information.
1781 // This is both handled in decode2().
1782 if (printmethod) {
1783 ResourceMark m;
1784 if (is_compiled_by_c1()) {
1785 tty->cr();
1786 tty->print_cr("============================= C1-compiled nmethod ==============================");
1787 }
1788 if (is_compiled_by_jvmci()) {
1789 tty->cr();
1790 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1791 }
1792 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1793 decode2(tty);
1794 #if defined(SUPPORT_DATA_STRUCTS)
1795 if (AbstractDisassembler::show_structs()) {
1796 // Print the oops from the underlying CodeBlob as well.
1797 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1798 print_oops(tty);
1799 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1800 print_metadata(tty);
1801 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1802 print_pcs_on(tty);
1803 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1804 if (oop_maps() != nullptr) {
1805 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1806 oop_maps()->print_on(tty);
1807 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1808 }
1809 }
1810 #endif
1811 } else {
1812 print(); // print the header part only.
1813 }
1814
1815 #if defined(SUPPORT_DATA_STRUCTS)
1816 if (AbstractDisassembler::show_structs()) {
1817 methodHandle mh(Thread::current(), _method);
1818 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1819 print_scopes();
1820 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1821 }
1822 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1823 print_relocations_on(tty);
1824 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1825 }
1826 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1827 print_dependencies_on(tty);
1828 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1829 }
1830 if (printmethod || PrintExceptionHandlers) {
1831 print_handler_table();
1832 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1833 print_nul_chk_table();
1834 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1835 }
1836
1837 if (printmethod) {
1838 print_recorded_oops();
1839 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1840 print_recorded_metadata();
1841 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1842 }
1843 }
1844 #endif
1845
1846 if (xtty != nullptr) {
1847 xtty->tail("print_nmethod");
1848 }
1849 }
1850
1851
1852 // Promote one word from an assembly-time handle to a live embedded oop.
1853 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1854 if (handle == nullptr ||
1855 // As a special case, IC oops are initialized to 1 or -1.
1856 handle == (jobject) Universe::non_oop_word()) {
1857 *(void**)dest = handle;
1858 } else {
1859 *dest = JNIHandles::resolve_non_null(handle);
1860 }
1861 }
1862
1863 void nmethod::copy_values(GrowableArray<Handle>* array) {
1864 int length = array->length();
1865 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1866 oop* dest = oops_begin();
1867 for (int index = 0 ; index < length; index++) {
1868 dest[index] = array->at(index)();
1869 }
1870 }
1871
1872 // Have to have the same name because it's called by a template
1873 void nmethod::copy_values(GrowableArray<jobject>* array) {
1874 int length = array->length();
1875 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1876 oop* dest = oops_begin();
1877 for (int index = 0 ; index < length; index++) {
1878 initialize_immediate_oop(&dest[index], array->at(index));
1879 }
1880
1881 // Now we can fix up all the oops in the code. We need to do this
1882 // in the code because the assembler uses jobjects as placeholders.
1883 // The code and relocations have already been initialized by the
1884 // CodeBlob constructor, so it is valid even at this early point to
1885 // iterate over relocations and patch the code.
1886 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1887 }
1888
1889 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1890 int length = array->length();
1891 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1892 Metadata** dest = metadata_begin();
1893 for (int index = 0 ; index < length; index++) {
1894 dest[index] = array->at(index);
1895 }
1896 }
1897
1898 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1899 // re-patch all oop-bearing instructions, just in case some oops moved
1900 RelocIterator iter(this, begin, end);
1901 while (iter.next()) {
1902 if (iter.type() == relocInfo::oop_type) {
1903 oop_Relocation* reloc = iter.oop_reloc();
1904 if (initialize_immediates && reloc->oop_is_immediate()) {
1905 oop* dest = reloc->oop_addr();
1906 jobject obj = *reinterpret_cast<jobject*>(dest);
1907 initialize_immediate_oop(dest, obj);
1908 }
1909 // Refresh the oop-related bits of this instruction.
1910 reloc->fix_oop_relocation();
1911 } else if (iter.type() == relocInfo::metadata_type) {
1912 metadata_Relocation* reloc = iter.metadata_reloc();
1913 reloc->fix_metadata_relocation();
1914 }
1915 }
1916 }
1917
1918 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
1919 RelocIterator iter(this);
1920 while (iter.next()) {
1921 if (iter.type() == relocInfo::oop_type) {
1922 oop_Relocation* reloc = iter.oop_reloc();
1923 if (reloc->oop_is_immediate()) {
1924 oop dest = reloc->oop_value();
1925 Handle h(thread, dest);
1926 oop_list.append(h);
1927 }
1928 } else if (iter.type() == relocInfo::metadata_type) {
1929 metadata_Relocation* reloc = iter.metadata_reloc();
1930 if (reloc->metadata_is_immediate()) {
1931 Metadata* m = reloc->metadata_value();
1932 metadata_list.append(m);
1933 }
1934 }
1935 }
1936 }
1937
1938 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1939 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1940 intptr_t cbaddr = (intptr_t) nm;
1941 intptr_t offset = ((intptr_t) pc) - cbaddr;
1942
1943 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1944 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1945 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1946 } else if (!nop->patch(oopmap_slot, offset)) {
1947 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1948 }
1949 }
1950
1951 void nmethod::finalize_relocations() {
1952 NoSafepointVerifier nsv;
1953
1954 GrowableArray<NativeMovConstReg*> virtual_call_data;
1955
1956 // Make sure that post call nops fill in nmethod offsets eagerly so
1957 // we don't have to race with deoptimization
1958 RelocIterator iter(this);
1959 while (iter.next()) {
1960 if (iter.type() == relocInfo::virtual_call_type) {
1961 virtual_call_Relocation* r = iter.virtual_call_reloc();
1962 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1963 virtual_call_data.append(value);
1964 } else if (iter.type() == relocInfo::post_call_nop_type) {
1965 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1966 address pc = reloc->addr();
1967 install_post_call_nop_displacement(this, pc);
1968 }
1969 }
1970
1971 if (virtual_call_data.length() > 0) {
1972 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
1973 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
1974 CompiledICData* next_data = _compiled_ic_data;
1975
1976 for (NativeMovConstReg* value : virtual_call_data) {
1977 value->set_data((intptr_t)next_data);
1978 next_data++;
1979 }
1980 }
1981 }
1982
1983 void nmethod::make_deoptimized() {
1984 if (!Continuations::enabled()) {
1985 // Don't deopt this again.
1986 set_deoptimized_done();
1987 return;
1988 }
1989
1990 assert(method() == nullptr || can_be_deoptimized(), "");
1991
1992 CompiledICLocker ml(this);
1993 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1994
1995 // If post call nops have been already patched, we can just bail-out.
1996 if (has_been_deoptimized()) {
1997 return;
1998 }
1999
2000 ResourceMark rm;
2001 RelocIterator iter(this, oops_reloc_begin());
2002
2003 while (iter.next()) {
2004
2005 switch (iter.type()) {
2006 case relocInfo::virtual_call_type: {
2007 CompiledIC *ic = CompiledIC_at(&iter);
2008 address pc = ic->end_of_call();
2009 NativePostCallNop* nop = nativePostCallNop_at(pc);
2010 if (nop != nullptr) {
2011 nop->make_deopt();
2012 }
2013 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2014 break;
2015 }
2016 case relocInfo::static_call_type:
2017 case relocInfo::opt_virtual_call_type: {
2018 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2019 address pc = csc->end_of_call();
2020 NativePostCallNop* nop = nativePostCallNop_at(pc);
2021 //tty->print_cr(" - static pc %p", pc);
2022 if (nop != nullptr) {
2023 nop->make_deopt();
2024 }
2025 // We can't assert here, there are some calls to stubs / runtime
2026 // that have reloc data and doesn't have a post call NOP.
2027 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2028 break;
2029 }
2030 default:
2031 break;
2032 }
2033 }
2034 // Don't deopt this again.
2035 set_deoptimized_done();
2036 }
2037
2038 void nmethod::verify_clean_inline_caches() {
2039 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2040
2041 ResourceMark rm;
2042 RelocIterator iter(this, oops_reloc_begin());
2043 while(iter.next()) {
2044 switch(iter.type()) {
2045 case relocInfo::virtual_call_type: {
2046 CompiledIC *ic = CompiledIC_at(&iter);
2047 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2048 assert(cb != nullptr, "destination not in CodeBlob?");
2049 nmethod* nm = cb->as_nmethod_or_null();
2050 if (nm != nullptr) {
2051 // Verify that inline caches pointing to bad nmethods are clean
2052 if (!nm->is_in_use() || nm->is_unloading()) {
2053 assert(ic->is_clean(), "IC should be clean");
2054 }
2055 }
2056 break;
2057 }
2058 case relocInfo::static_call_type:
2059 case relocInfo::opt_virtual_call_type: {
2060 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2061 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2062 assert(cb != nullptr, "destination not in CodeBlob?");
2063 nmethod* nm = cb->as_nmethod_or_null();
2064 if (nm != nullptr) {
2065 // Verify that inline caches pointing to bad nmethods are clean
2066 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2067 assert(cdc->is_clean(), "IC should be clean");
2068 }
2069 }
2070 break;
2071 }
2072 default:
2073 break;
2074 }
2075 }
2076 }
2077
2078 void nmethod::mark_as_maybe_on_stack() {
2079 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
2080 }
2081
2082 bool nmethod::is_maybe_on_stack() {
2083 // If the condition below is true, it means that the nmethod was found to
2084 // be alive the previous completed marking cycle.
2085 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2086 }
2087
2088 void nmethod::inc_decompile_count() {
2089 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2090 // Could be gated by ProfileTraps, but do not bother...
2091 #if INCLUDE_JVMCI
2092 if (jvmci_skip_profile_deopt()) {
2093 return;
2094 }
2095 #endif
2096 Method* m = method();
2097 if (m == nullptr) return;
2098 MethodData* mdo = m->method_data();
2099 if (mdo == nullptr) return;
2100 // There is a benign race here. See comments in methodData.hpp.
2101 mdo->inc_decompile_count();
2102 }
2103
2104 void nmethod::inc_method_profiling_count() {
2105 Atomic::inc(&_method_profiling_count);
2106 }
2107
2108 uint64_t nmethod::method_profiling_count() {
2109 return _method_profiling_count;
2110 }
2111
2112 bool nmethod::try_transition(signed char new_state_int) {
2113 signed char new_state = new_state_int;
2114 assert_lock_strong(NMethodState_lock);
2115 signed char old_state = _state;
2116 if (old_state >= new_state) {
2117 // Ensure monotonicity of transitions.
2118 return false;
2119 }
2120 Atomic::store(&_state, new_state);
2121 return true;
2122 }
2123
2124 void nmethod::invalidate_osr_method() {
2125 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2126 // Remove from list of active nmethods
2127 if (method() != nullptr) {
2128 method()->method_holder()->remove_osr_nmethod(this);
2129 }
2130 }
2131
2132 void nmethod::log_state_change(InvalidationReason invalidation_reason) const {
2133 if (LogCompilation) {
2134 if (xtty != nullptr) {
2135 ttyLocker ttyl; // keep the following output all in one block
2136 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2137 os::current_thread_id(), invalidation_reason_to_string(invalidation_reason));
2138 log_identity(xtty);
2139 xtty->stamp();
2140 xtty->end_elem();
2141 }
2142 }
2143
2144 ResourceMark rm;
2145 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2146 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2147
2148 CompileTask::print_ul(this, ss.freeze());
2149 if (PrintCompilation) {
2150 print_on_with_msg(tty, ss.freeze());
2151 }
2152 }
2153
2154 void nmethod::unlink_from_method() {
2155 if (method() != nullptr) {
2156 method()->unlink_code(this);
2157 }
2158 }
2159
2160 // Invalidate code
2161 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason, bool keep_aot_entry) {
2162 // This can be called while the system is already at a safepoint which is ok
2163 NoSafepointVerifier nsv;
2164
2165 if (is_unloading()) {
2166 // If the nmethod is unloading, then it is already not entrant through
2167 // the nmethod entry barriers. No need to do anything; GC will unload it.
2168 return false;
2169 }
2170
2171 if (Atomic::load(&_state) == not_entrant) {
2172 // Avoid taking the lock if already in required state.
2173 // This is safe from races because the state is an end-state,
2174 // which the nmethod cannot back out of once entered.
2175 // No need for fencing either.
2176 return false;
2177 }
2178
2179 {
2180 // Enter critical section. Does not block for safepoint.
2181 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2182
2183 if (Atomic::load(&_state) == not_entrant) {
2184 // another thread already performed this transition so nothing
2185 // to do, but return false to indicate this.
2186 return false;
2187 }
2188
2189 if (is_osr_method()) {
2190 // This logic is equivalent to the logic below for patching the
2191 // verified entry point of regular methods.
2192 // this effectively makes the osr nmethod not entrant
2193 invalidate_osr_method();
2194 } else {
2195 // The caller can be calling the method statically or through an inline
2196 // cache call.
2197 BarrierSet::barrier_set()->barrier_set_nmethod()->make_not_entrant(this);
2198 }
2199
2200 if (update_recompile_counts()) {
2201 // Mark the method as decompiled.
2202 inc_decompile_count();
2203 }
2204
2205 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2206 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2207 // If nmethod entry barriers are not supported, we won't mark
2208 // nmethods as on-stack when they become on-stack. So we
2209 // degrade to a less accurate flushing strategy, for now.
2210 mark_as_maybe_on_stack();
2211 }
2212
2213 // Change state
2214 bool success = try_transition(not_entrant);
2215 assert(success, "Transition can't fail");
2216
2217 // Log the transition once
2218 log_state_change(invalidation_reason);
2219
2220 // Remove nmethod from method.
2221 unlink_from_method();
2222
2223 if (!keep_aot_entry) {
2224 // Keep AOT code if it was simply replaced
2225 // otherwise make it not entrant too.
2226 AOTCodeCache::invalidate(_aot_code_entry);
2227 }
2228
2229 CompileBroker::log_not_entrant(this);
2230 } // leave critical region under NMethodState_lock
2231
2232 #if INCLUDE_JVMCI
2233 // Invalidate can't occur while holding the NMethodState_lock
2234 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2235 if (nmethod_data != nullptr) {
2236 nmethod_data->invalidate_nmethod_mirror(this, invalidation_reason);
2237 }
2238 #endif
2239
2240 #ifdef ASSERT
2241 if (is_osr_method() && method() != nullptr) {
2242 // Make sure osr nmethod is invalidated, i.e. not on the list
2243 bool found = method()->method_holder()->remove_osr_nmethod(this);
2244 assert(!found, "osr nmethod should have been invalidated");
2245 }
2246 #endif
2247
2248 return true;
2249 }
2250
2251 // For concurrent GCs, there must be a handshake between unlink and flush
2252 void nmethod::unlink() {
2253 if (is_unlinked()) {
2254 // Already unlinked.
2255 return;
2256 }
2257
2258 flush_dependencies();
2259
2260 // unlink_from_method will take the NMethodState_lock.
2261 // In this case we don't strictly need it when unlinking nmethods from
2262 // the Method, because it is only concurrently unlinked by
2263 // the entry barrier, which acquires the per nmethod lock.
2264 unlink_from_method();
2265
2266 if (is_osr_method()) {
2267 invalidate_osr_method();
2268 }
2269
2270 #if INCLUDE_JVMCI
2271 // Clear the link between this nmethod and a HotSpotNmethod mirror
2272 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2273 if (nmethod_data != nullptr) {
2274 nmethod_data->invalidate_nmethod_mirror(this, is_cold() ?
2275 nmethod::InvalidationReason::UNLOADING_COLD :
2276 nmethod::InvalidationReason::UNLOADING);
2277 }
2278 #endif
2279
2280 // Post before flushing as jmethodID is being used
2281 post_compiled_method_unload();
2282
2283 // Register for flushing when it is safe. For concurrent class unloading,
2284 // that would be after the unloading handshake, and for STW class unloading
2285 // that would be when getting back to the VM thread.
2286 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2287 }
2288
2289 void nmethod::purge(bool unregister_nmethod) {
2290
2291 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2292
2293 // completely deallocate this method
2294 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, compile_kind(), p2i(this));
2295
2296 LogTarget(Debug, codecache) lt;
2297 if (lt.is_enabled()) {
2298 ResourceMark rm;
2299 LogStream ls(lt);
2300 const char* method_name = method()->name()->as_C_string();
2301 const size_t codecache_capacity = CodeCache::capacity()/1024;
2302 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2303 ls.print("Flushing %s nmethod %6d/" INTPTR_FORMAT ", level=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2304 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2305 compile_kind(), _compile_id, p2i(this), _comp_level, is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2306 codecache_capacity, codecache_free_space, method_name, compiler_name());
2307 }
2308
2309 // We need to deallocate any ExceptionCache data.
2310 // Note that we do not need to grab the nmethod lock for this, it
2311 // better be thread safe if we're disposing of it!
2312 ExceptionCache* ec = exception_cache();
2313 while(ec != nullptr) {
2314 ExceptionCache* next = ec->next();
2315 delete ec;
2316 ec = next;
2317 }
2318 if (_pc_desc_container != nullptr) {
2319 delete _pc_desc_container;
2320 }
2321 if (_compiled_ic_data != nullptr) {
2322 delete[] _compiled_ic_data;
2323 }
2324
2325 if (_immutable_data != data_end() && !AOTCodeCache::is_address_in_aot_cache((address)_oop_maps)) {
2326 os::free(_immutable_data);
2327 _immutable_data = blob_end(); // Valid not null address
2328 }
2329 if (unregister_nmethod) {
2330 Universe::heap()->unregister_nmethod(this);
2331 }
2332 CodeCache::unregister_old_nmethod(this);
2333
2334 JVMCI_ONLY( _metadata_size = 0; )
2335 CodeBlob::purge();
2336 }
2337
2338 oop nmethod::oop_at(int index) const {
2339 if (index == 0) {
2340 return nullptr;
2341 }
2342
2343 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2344 return bs_nm->oop_load_no_keepalive(this, index);
2345 }
2346
2347 oop nmethod::oop_at_phantom(int index) const {
2348 if (index == 0) {
2349 return nullptr;
2350 }
2351
2352 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2353 return bs_nm->oop_load_phantom(this, index);
2354 }
2355
2356 //
2357 // Notify all classes this nmethod is dependent on that it is no
2358 // longer dependent.
2359
2360 void nmethod::flush_dependencies() {
2361 if (!has_flushed_dependencies()) {
2362 set_has_flushed_dependencies(true);
2363 for (Dependencies::DepStream deps(this); deps.next(); ) {
2364 if (deps.type() == Dependencies::call_site_target_value) {
2365 // CallSite dependencies are managed on per-CallSite instance basis.
2366 oop call_site = deps.argument_oop(0);
2367 MethodHandles::clean_dependency_context(call_site);
2368 } else {
2369 InstanceKlass* ik = deps.context_type();
2370 if (ik == nullptr) {
2371 continue; // ignore things like evol_method
2372 }
2373 // During GC liveness of dependee determines class that needs to be updated.
2374 // The GC may clean dependency contexts concurrently and in parallel.
2375 ik->clean_dependency_context();
2376 }
2377 }
2378 }
2379 }
2380
2381 void nmethod::post_compiled_method(CompileTask* task) {
2382 task->mark_success();
2383 task->set_nm_content_size(content_size());
2384 task->set_nm_insts_size(insts_size());
2385 task->set_nm_total_size(total_size());
2386
2387 // task->is_aot_load() is true only for loaded AOT code.
2388 // nmethod::_aot_code_entry is set for loaded and stored AOT code
2389 // to invalidate the entry when nmethod is deoptimized.
2390 // VerifyAOTCode is option to not store in archive AOT code.
2391 guarantee((_aot_code_entry != nullptr) || !task->is_aot_load() || VerifyAOTCode, "sanity");
2392
2393 // JVMTI -- compiled method notification (must be done outside lock)
2394 post_compiled_method_load_event();
2395
2396 if (CompilationLog::log() != nullptr) {
2397 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2398 }
2399
2400 const DirectiveSet* directive = task->directive();
2401 maybe_print_nmethod(directive);
2402 }
2403
2404 // ------------------------------------------------------------------
2405 // post_compiled_method_load_event
2406 // new method for install_code() path
2407 // Transfer information from compilation to jvmti
2408 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2409 // This is a bad time for a safepoint. We don't want
2410 // this nmethod to get unloaded while we're queueing the event.
2411 NoSafepointVerifier nsv;
2412
2413 Method* m = method();
2414 HOTSPOT_COMPILED_METHOD_LOAD(
2415 (char *) m->klass_name()->bytes(),
2416 m->klass_name()->utf8_length(),
2417 (char *) m->name()->bytes(),
2418 m->name()->utf8_length(),
2419 (char *) m->signature()->bytes(),
2420 m->signature()->utf8_length(),
2421 insts_begin(), insts_size());
2422
2423
2424 if (JvmtiExport::should_post_compiled_method_load()) {
2425 // Only post unload events if load events are found.
2426 set_load_reported();
2427 // If a JavaThread hasn't been passed in, let the Service thread
2428 // (which is a real Java thread) post the event
2429 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2430 if (state == nullptr) {
2431 // Execute any barrier code for this nmethod as if it's called, since
2432 // keeping it alive looks like stack walking.
2433 run_nmethod_entry_barrier();
2434 ServiceThread::enqueue_deferred_event(&event);
2435 } else {
2436 // This enters the nmethod barrier outside in the caller.
2437 state->enqueue_event(&event);
2438 }
2439 }
2440 }
2441
2442 void nmethod::post_compiled_method_unload() {
2443 assert(_method != nullptr, "just checking");
2444 DTRACE_METHOD_UNLOAD_PROBE(method());
2445
2446 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2447 // post the event. The Method* will not be valid when this is freed.
2448
2449 // Don't bother posting the unload if the load event wasn't posted.
2450 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2451 JvmtiDeferredEvent event =
2452 JvmtiDeferredEvent::compiled_method_unload_event(
2453 method()->jmethod_id(), insts_begin());
2454 ServiceThread::enqueue_deferred_event(&event);
2455 }
2456 }
2457
2458 // Iterate over metadata calling this function. Used by RedefineClasses
2459 void nmethod::metadata_do(MetadataClosure* f) {
2460 {
2461 // Visit all immediate references that are embedded in the instruction stream.
2462 RelocIterator iter(this, oops_reloc_begin());
2463 while (iter.next()) {
2464 if (iter.type() == relocInfo::metadata_type) {
2465 metadata_Relocation* r = iter.metadata_reloc();
2466 // In this metadata, we must only follow those metadatas directly embedded in
2467 // the code. Other metadatas (oop_index>0) are seen as part of
2468 // the metadata section below.
2469 assert(1 == (r->metadata_is_immediate()) +
2470 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2471 "metadata must be found in exactly one place");
2472 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2473 Metadata* md = r->metadata_value();
2474 if (md != _method) f->do_metadata(md);
2475 }
2476 } else if (iter.type() == relocInfo::virtual_call_type) {
2477 // Check compiledIC holders associated with this nmethod
2478 ResourceMark rm;
2479 CompiledIC *ic = CompiledIC_at(&iter);
2480 ic->metadata_do(f);
2481 }
2482 }
2483 }
2484
2485 // Visit the metadata section
2486 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2487 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2488 Metadata* md = *p;
2489 f->do_metadata(md);
2490 }
2491
2492 // Visit metadata not embedded in the other places.
2493 if (_method != nullptr) f->do_metadata(_method);
2494 }
2495
2496 // Heuristic for nuking nmethods even though their oops are live.
2497 // Main purpose is to reduce code cache pressure and get rid of
2498 // nmethods that don't seem to be all that relevant any longer.
2499 bool nmethod::is_cold() {
2500 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2501 // No heuristic unloading at all
2502 return false;
2503 }
2504
2505 if (!is_maybe_on_stack() && is_not_entrant()) {
2506 // Not entrant nmethods that are not on any stack can just
2507 // be removed
2508 return true;
2509 }
2510
2511 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2512 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2513 // On platforms that don't support nmethod entry barriers, we can't
2514 // trust the temporal aspect of the gc epochs. So we can't detect
2515 // cold nmethods on such platforms.
2516 return false;
2517 }
2518
2519 if (!UseCodeCacheFlushing) {
2520 // Bail out if we don't heuristically remove nmethods
2521 return false;
2522 }
2523
2524 // Other code can be phased out more gradually after N GCs
2525 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2526 }
2527
2528 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2529 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2530 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2531 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2532 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2533
2534 class IsUnloadingState: public AllStatic {
2535 static const uint8_t _is_unloading_mask = 1;
2536 static const uint8_t _is_unloading_shift = 0;
2537 static const uint8_t _unloading_cycle_mask = 6;
2538 static const uint8_t _unloading_cycle_shift = 1;
2539
2540 static uint8_t set_is_unloading(uint8_t state, bool value) {
2541 state &= (uint8_t)~_is_unloading_mask;
2542 if (value) {
2543 state |= 1 << _is_unloading_shift;
2544 }
2545 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2546 return state;
2547 }
2548
2549 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2550 state &= (uint8_t)~_unloading_cycle_mask;
2551 state |= (uint8_t)(value << _unloading_cycle_shift);
2552 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2553 return state;
2554 }
2555
2556 public:
2557 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2558 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2559
2560 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2561 uint8_t state = 0;
2562 state = set_is_unloading(state, is_unloading);
2563 state = set_unloading_cycle(state, unloading_cycle);
2564 return state;
2565 }
2566 };
2567
2568 bool nmethod::is_unloading() {
2569 uint8_t state = Atomic::load(&_is_unloading_state);
2570 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2571 if (state_is_unloading) {
2572 return true;
2573 }
2574 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2575 uint8_t current_cycle = CodeCache::unloading_cycle();
2576 if (state_unloading_cycle == current_cycle) {
2577 return false;
2578 }
2579
2580 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2581 // should be unloaded. This can be either because there is a dead oop,
2582 // or because is_cold() heuristically determines it is time to unload.
2583 state_unloading_cycle = current_cycle;
2584 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2585 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2586
2587 // Note that if an nmethod has dead oops, everyone will agree that the
2588 // nmethod is_unloading. However, the is_cold heuristics can yield
2589 // different outcomes, so we guard the computed result with a CAS
2590 // to ensure all threads have a shared view of whether an nmethod
2591 // is_unloading or not.
2592 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2593
2594 if (found_state == state) {
2595 // First to change state, we win
2596 return state_is_unloading;
2597 } else {
2598 // State already set, so use it
2599 return IsUnloadingState::is_unloading(found_state);
2600 }
2601 }
2602
2603 void nmethod::clear_unloading_state() {
2604 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2605 Atomic::store(&_is_unloading_state, state);
2606 }
2607
2608
2609 // This is called at the end of the strong tracing/marking phase of a
2610 // GC to unload an nmethod if it contains otherwise unreachable
2611 // oops or is heuristically found to be not important.
2612 void nmethod::do_unloading(bool unloading_occurred) {
2613 // Make sure the oop's ready to receive visitors
2614 if (is_unloading()) {
2615 unlink();
2616 } else {
2617 unload_nmethod_caches(unloading_occurred);
2618 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2619 if (bs_nm != nullptr) {
2620 bs_nm->disarm(this);
2621 }
2622 }
2623 }
2624
2625 void nmethod::oops_do(OopClosure* f) {
2626 // Prevent extra code cache walk for platforms that don't have immediate oops.
2627 if (relocInfo::mustIterateImmediateOopsInCode()) {
2628 RelocIterator iter(this, oops_reloc_begin());
2629
2630 while (iter.next()) {
2631 if (iter.type() == relocInfo::oop_type ) {
2632 oop_Relocation* r = iter.oop_reloc();
2633 // In this loop, we must only follow those oops directly embedded in
2634 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2635 assert(1 == (r->oop_is_immediate()) +
2636 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2637 "oop must be found in exactly one place");
2638 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2639 f->do_oop(r->oop_addr());
2640 }
2641 }
2642 }
2643 }
2644
2645 // Scopes
2646 // This includes oop constants not inlined in the code stream.
2647 for (oop* p = oops_begin(); p < oops_end(); p++) {
2648 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2649 f->do_oop(p);
2650 }
2651 }
2652
2653 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2654 // Process oops in the nmethod
2655 oops_do(cl);
2656
2657 // CodeCache unloading support
2658 mark_as_maybe_on_stack();
2659
2660 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2661 bs_nm->disarm(this);
2662
2663 // There's an assumption made that this function is not used by GCs that
2664 // relocate objects, and therefore we don't call fix_oop_relocations.
2665 }
2666
2667 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2668
2669 void nmethod::oops_do_log_change(const char* state) {
2670 LogTarget(Trace, gc, nmethod) lt;
2671 if (lt.is_enabled()) {
2672 LogStream ls(lt);
2673 CompileTask::print(&ls, this, state, true /* short_form */);
2674 }
2675 }
2676
2677 bool nmethod::oops_do_try_claim() {
2678 if (oops_do_try_claim_weak_request()) {
2679 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2680 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2681 return true;
2682 }
2683 return false;
2684 }
2685
2686 bool nmethod::oops_do_try_claim_weak_request() {
2687 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2688
2689 if ((_oops_do_mark_link == nullptr) &&
2690 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2691 oops_do_log_change("oops_do, mark weak request");
2692 return true;
2693 }
2694 return false;
2695 }
2696
2697 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2698 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2699 }
2700
2701 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2702 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2703
2704 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));
2705 if (old_next == nullptr) {
2706 oops_do_log_change("oops_do, mark strong done");
2707 }
2708 return old_next;
2709 }
2710
2711 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2712 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2713 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2714
2715 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2716 if (old_next == next) {
2717 oops_do_log_change("oops_do, mark strong request");
2718 }
2719 return old_next;
2720 }
2721
2722 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2723 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2724 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2725
2726 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2727 if (old_next == next) {
2728 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2729 return true;
2730 }
2731 return false;
2732 }
2733
2734 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2735 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2736
2737 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2738 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2739 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2740
2741 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2742 // Self-loop if needed.
2743 if (old_head == nullptr) {
2744 old_head = this;
2745 }
2746 // Try to install end of list and weak done tag.
2747 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)) {
2748 oops_do_log_change("oops_do, mark weak done");
2749 return nullptr;
2750 } else {
2751 return old_head;
2752 }
2753 }
2754
2755 void nmethod::oops_do_add_to_list_as_strong_done() {
2756 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2757
2758 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2759 // Self-loop if needed.
2760 if (old_head == nullptr) {
2761 old_head = this;
2762 }
2763 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2764 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2765
2766 oops_do_set_strong_done(old_head);
2767 }
2768
2769 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2770 if (!oops_do_try_claim_weak_request()) {
2771 // Failed to claim for weak processing.
2772 oops_do_log_change("oops_do, mark weak request fail");
2773 return;
2774 }
2775
2776 p->do_regular_processing(this);
2777
2778 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2779 if (old_head == nullptr) {
2780 return;
2781 }
2782 oops_do_log_change("oops_do, mark weak done fail");
2783 // Adding to global list failed, another thread added a strong request.
2784 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2785 "must be but is %u", extract_state(_oops_do_mark_link));
2786
2787 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2788
2789 oops_do_set_strong_done(old_head);
2790 // Do missing strong processing.
2791 p->do_remaining_strong_processing(this);
2792 }
2793
2794 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2795 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2796 if (next_raw == nullptr) {
2797 p->do_regular_processing(this);
2798 oops_do_add_to_list_as_strong_done();
2799 return;
2800 }
2801 // Claim failed. Figure out why and handle it.
2802 if (oops_do_has_weak_request(next_raw)) {
2803 oops_do_mark_link* old = next_raw;
2804 // Claim failed because being weak processed (state == "weak request").
2805 // Try to request deferred strong processing.
2806 next_raw = oops_do_try_add_strong_request(old);
2807 if (next_raw == old) {
2808 // Successfully requested deferred strong processing.
2809 return;
2810 }
2811 // Failed because of a concurrent transition. No longer in "weak request" state.
2812 }
2813 if (oops_do_has_any_strong_state(next_raw)) {
2814 // Already claimed for strong processing or requested for such.
2815 return;
2816 }
2817 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2818 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2819 p->do_remaining_strong_processing(this);
2820 return;
2821 }
2822 // Claim failed, some other thread got it.
2823 }
2824
2825 void nmethod::oops_do_marking_prologue() {
2826 assert_at_safepoint();
2827
2828 log_trace(gc, nmethod)("oops_do_marking_prologue");
2829 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2830 }
2831
2832 void nmethod::oops_do_marking_epilogue() {
2833 assert_at_safepoint();
2834
2835 nmethod* next = _oops_do_mark_nmethods;
2836 _oops_do_mark_nmethods = nullptr;
2837 if (next != nullptr) {
2838 nmethod* cur;
2839 do {
2840 cur = next;
2841 next = extract_nmethod(cur->_oops_do_mark_link);
2842 cur->_oops_do_mark_link = nullptr;
2843 DEBUG_ONLY(cur->verify_oop_relocations());
2844
2845 LogTarget(Trace, gc, nmethod) lt;
2846 if (lt.is_enabled()) {
2847 LogStream ls(lt);
2848 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2849 }
2850 // End if self-loop has been detected.
2851 } while (cur != next);
2852 }
2853 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2854 }
2855
2856 inline bool includes(void* p, void* from, void* to) {
2857 return from <= p && p < to;
2858 }
2859
2860
2861 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2862 assert(count >= 2, "must be sentinel values, at least");
2863
2864 #ifdef ASSERT
2865 // must be sorted and unique; we do a binary search in find_pc_desc()
2866 int prev_offset = pcs[0].pc_offset();
2867 assert(prev_offset == PcDesc::lower_offset_limit,
2868 "must start with a sentinel");
2869 for (int i = 1; i < count; i++) {
2870 int this_offset = pcs[i].pc_offset();
2871 assert(this_offset > prev_offset, "offsets must be sorted");
2872 prev_offset = this_offset;
2873 }
2874 assert(prev_offset == PcDesc::upper_offset_limit,
2875 "must end with a sentinel");
2876 #endif //ASSERT
2877
2878 // Search for MethodHandle invokes and tag the nmethod.
2879 for (int i = 0; i < count; i++) {
2880 if (pcs[i].is_method_handle_invoke()) {
2881 set_has_method_handle_invokes(true);
2882 break;
2883 }
2884 }
2885 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler");
2886
2887 int size = count * sizeof(PcDesc);
2888 assert(scopes_pcs_size() >= size, "oob");
2889 memcpy(scopes_pcs_begin(), pcs, size);
2890
2891 // Adjust the final sentinel downward.
2892 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2893 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2894 last_pc->set_pc_offset(content_size() + 1);
2895 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2896 // Fill any rounding gaps with copies of the last record.
2897 last_pc[1] = last_pc[0];
2898 }
2899 // The following assert could fail if sizeof(PcDesc) is not
2900 // an integral multiple of oopSize (the rounding term).
2901 // If it fails, change the logic to always allocate a multiple
2902 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2903 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2904 }
2905
2906 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2907 assert(scopes_data_size() >= size, "oob");
2908 memcpy(scopes_data_begin(), buffer, size);
2909 }
2910
2911 #ifdef ASSERT
2912 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2913 PcDesc* res = nullptr;
2914 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2915 "must start with a sentinel");
2916 // lower + 1 to exclude initial sentinel
2917 for (PcDesc* p = lower + 1; p < upper; p++) {
2918 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2919 if (match_desc(p, pc_offset, approximate)) {
2920 if (res == nullptr) {
2921 res = p;
2922 } else {
2923 res = (PcDesc*) badAddress;
2924 }
2925 }
2926 }
2927 return res;
2928 }
2929 #endif
2930
2931
2932 #ifndef PRODUCT
2933 // Version of method to collect statistic
2934 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2935 PcDesc* lower, PcDesc* upper) {
2936 ++pc_nmethod_stats.pc_desc_queries;
2937 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2938
2939 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2940 assert(desc != nullptr, "PcDesc cache should be initialized already");
2941 if (desc->pc_offset() == (pc - code_begin)) {
2942 // Cached value matched
2943 ++pc_nmethod_stats.pc_desc_tests;
2944 ++pc_nmethod_stats.pc_desc_repeats;
2945 return desc;
2946 }
2947 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2948 }
2949 #endif
2950
2951 // Finds a PcDesc with real-pc equal to "pc"
2952 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2953 PcDesc* lower_incl, PcDesc* upper_incl) {
2954 if ((pc < code_begin) ||
2955 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2956 return nullptr; // PC is wildly out of range
2957 }
2958 int pc_offset = (int) (pc - code_begin);
2959
2960 // Check the PcDesc cache if it contains the desired PcDesc
2961 // (This as an almost 100% hit rate.)
2962 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2963 if (res != nullptr) {
2964 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2965 return res;
2966 }
2967
2968 // Fallback algorithm: quasi-linear search for the PcDesc
2969 // Find the last pc_offset less than the given offset.
2970 // The successor must be the required match, if there is a match at all.
2971 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2972 PcDesc* lower = lower_incl; // this is initial sentinel
2973 PcDesc* upper = upper_incl - 1; // exclude final sentinel
2974 if (lower >= upper) return nullptr; // no PcDescs at all
2975
2976 #define assert_LU_OK \
2977 /* invariant on lower..upper during the following search: */ \
2978 assert(lower->pc_offset() < pc_offset, "sanity"); \
2979 assert(upper->pc_offset() >= pc_offset, "sanity")
2980 assert_LU_OK;
2981
2982 // Use the last successful return as a split point.
2983 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2984 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2985 if (mid->pc_offset() < pc_offset) {
2986 lower = mid;
2987 } else {
2988 upper = mid;
2989 }
2990
2991 // Take giant steps at first (4096, then 256, then 16, then 1)
2992 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
2993 const int RADIX = (1 << LOG2_RADIX);
2994 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2995 while ((mid = lower + step) < upper) {
2996 assert_LU_OK;
2997 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2998 if (mid->pc_offset() < pc_offset) {
2999 lower = mid;
3000 } else {
3001 upper = mid;
3002 break;
3003 }
3004 }
3005 assert_LU_OK;
3006 }
3007
3008 // Sneak up on the value with a linear search of length ~16.
3009 while (true) {
3010 assert_LU_OK;
3011 mid = lower + 1;
3012 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3013 if (mid->pc_offset() < pc_offset) {
3014 lower = mid;
3015 } else {
3016 upper = mid;
3017 break;
3018 }
3019 }
3020 #undef assert_LU_OK
3021
3022 if (match_desc(upper, pc_offset, approximate)) {
3023 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3024 if (!Thread::current_in_asgct()) {
3025 // we don't want to modify the cache if we're in ASGCT
3026 // which is typically called in a signal handler
3027 _pc_desc_cache.add_pc_desc(upper);
3028 }
3029 return upper;
3030 } else {
3031 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3032 return nullptr;
3033 }
3034 }
3035
3036 bool nmethod::check_dependency_on(DepChange& changes) {
3037 // What has happened:
3038 // 1) a new class dependee has been added
3039 // 2) dependee and all its super classes have been marked
3040 bool found_check = false; // set true if we are upset
3041 for (Dependencies::DepStream deps(this); deps.next(); ) {
3042 // Evaluate only relevant dependencies.
3043 if (deps.spot_check_dependency_at(changes) != nullptr) {
3044 found_check = true;
3045 NOT_DEBUG(break);
3046 }
3047 }
3048 return found_check;
3049 }
3050
3051 // Called from mark_for_deoptimization, when dependee is invalidated.
3052 bool nmethod::is_dependent_on_method(Method* dependee) {
3053 for (Dependencies::DepStream deps(this); deps.next(); ) {
3054 if (deps.type() != Dependencies::evol_method)
3055 continue;
3056 Method* method = deps.method_argument(0);
3057 if (method == dependee) return true;
3058 }
3059 return false;
3060 }
3061
3062 void nmethod_init() {
3063 // make sure you didn't forget to adjust the filler fields
3064 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3065 }
3066
3067 // -----------------------------------------------------------------------------
3068 // Verification
3069
3070 class VerifyOopsClosure: public OopClosure {
3071 nmethod* _nm;
3072 bool _ok;
3073 public:
3074 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3075 bool ok() { return _ok; }
3076 virtual void do_oop(oop* p) {
3077 if (oopDesc::is_oop_or_null(*p)) return;
3078 // Print diagnostic information before calling print_nmethod().
3079 // Assertions therein might prevent call from returning.
3080 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3081 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3082 if (_ok) {
3083 _nm->print_nmethod(true);
3084 _ok = false;
3085 }
3086 }
3087 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3088 };
3089
3090 class VerifyMetadataClosure: public MetadataClosure {
3091 public:
3092 void do_metadata(Metadata* md) {
3093 if (md->is_method()) {
3094 Method* method = (Method*)md;
3095 assert(!method->is_old(), "Should not be installing old methods");
3096 }
3097 }
3098 };
3099
3100
3101 void nmethod::verify() {
3102 if (is_not_entrant())
3103 return;
3104
3105 // assert(oopDesc::is_oop(method()), "must be valid");
3106
3107 ResourceMark rm;
3108
3109 if (!CodeCache::contains(this)) {
3110 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3111 }
3112
3113 if(is_native_method() )
3114 return;
3115
3116 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3117 if (nm != this) {
3118 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3119 }
3120
3121 // Verification can triggered during shutdown after AOTCodeCache is closed.
3122 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3123 if (!is_aot() || AOTCodeCache::is_on()) {
3124 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3125 if (! p->verify(this)) {
3126 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3127 }
3128 }
3129
3130 #ifdef ASSERT
3131 #if INCLUDE_JVMCI
3132 {
3133 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3134 ImmutableOopMapSet* oms = oop_maps();
3135 ImplicitExceptionTable implicit_table(this);
3136 for (uint i = 0; i < implicit_table.len(); i++) {
3137 int exec_offset = (int) implicit_table.get_exec_offset(i);
3138 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3139 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3140 bool found = false;
3141 for (int i = 0, imax = oms->count(); i < imax; i++) {
3142 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3143 found = true;
3144 break;
3145 }
3146 }
3147 assert(found, "missing oopmap");
3148 }
3149 }
3150 }
3151 #endif
3152 #endif
3153 }
3154
3155 VerifyOopsClosure voc(this);
3156 oops_do(&voc);
3157 assert(voc.ok(), "embedded oops must be OK");
3158 Universe::heap()->verify_nmethod(this);
3159
3160 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3161 nm->method()->external_name(), p2i(_oops_do_mark_link));
3162 if (!is_aot() || AOTCodeCache::is_on()) {
3163 verify_scopes();
3164 }
3165
3166 CompiledICLocker nm_verify(this);
3167 VerifyMetadataClosure vmc;
3168 metadata_do(&vmc);
3169 }
3170
3171
3172 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3173
3174 // Verify IC only when nmethod installation is finished.
3175 if (!is_not_installed()) {
3176 if (CompiledICLocker::is_safe(this)) {
3177 if (is_inline_cache) {
3178 CompiledIC_at(this, call_site);
3179 } else {
3180 CompiledDirectCall::at(call_site);
3181 }
3182 } else {
3183 CompiledICLocker ml_verify(this);
3184 if (is_inline_cache) {
3185 CompiledIC_at(this, call_site);
3186 } else {
3187 CompiledDirectCall::at(call_site);
3188 }
3189 }
3190 }
3191
3192 HandleMark hm(Thread::current());
3193
3194 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3195 assert(pd != nullptr, "PcDesc must exist");
3196 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3197 !sd->is_top(); sd = sd->sender()) {
3198 sd->verify();
3199 }
3200 }
3201
3202 void nmethod::verify_scopes() {
3203 if( !method() ) return; // Runtime stubs have no scope
3204 if (method()->is_native()) return; // Ignore stub methods.
3205 // iterate through all interrupt point
3206 // and verify the debug information is valid.
3207 RelocIterator iter(this);
3208 while (iter.next()) {
3209 address stub = nullptr;
3210 switch (iter.type()) {
3211 case relocInfo::virtual_call_type:
3212 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3213 break;
3214 case relocInfo::opt_virtual_call_type:
3215 stub = iter.opt_virtual_call_reloc()->static_stub();
3216 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3217 break;
3218 case relocInfo::static_call_type:
3219 stub = iter.static_call_reloc()->static_stub();
3220 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3221 break;
3222 case relocInfo::runtime_call_type:
3223 case relocInfo::runtime_call_w_cp_type: {
3224 address destination = iter.reloc()->value();
3225 // Right now there is no way to find out which entries support
3226 // an interrupt point. It would be nice if we had this
3227 // information in a table.
3228 break;
3229 }
3230 default:
3231 break;
3232 }
3233 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3234 }
3235 }
3236
3237
3238 // -----------------------------------------------------------------------------
3239 // Printing operations
3240
3241 void nmethod::print_on_impl(outputStream* st) const {
3242 ResourceMark rm;
3243
3244 st->print("Compiled method ");
3245
3246 if (is_compiled_by_c1()) {
3247 st->print("(c1) ");
3248 } else if (is_compiled_by_c2()) {
3249 st->print("(c2) ");
3250 } else if (is_compiled_by_jvmci()) {
3251 st->print("(JVMCI) ");
3252 } else {
3253 st->print("(n/a) ");
3254 }
3255
3256 print_on_with_msg(st, nullptr);
3257
3258 if (WizardMode) {
3259 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3260 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3261 st->print(" { ");
3262 st->print_cr("%s ", state());
3263 st->print_cr("}:");
3264 }
3265 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3266 p2i(this),
3267 p2i(this) + size(),
3268 size());
3269 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3270 p2i(consts_begin()),
3271 p2i(consts_end()),
3272 consts_size());
3273 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3274 p2i(insts_begin()),
3275 p2i(insts_end()),
3276 insts_size());
3277 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3278 p2i(stub_begin()),
3279 p2i(stub_end()),
3280 stub_size());
3281 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3282 p2i(oops_begin()),
3283 p2i(oops_end()),
3284 oops_size());
3285 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3286 p2i(mutable_data_begin()),
3287 p2i(mutable_data_end()),
3288 mutable_data_size());
3289 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3290 p2i(relocation_begin()),
3291 p2i(relocation_end()),
3292 relocation_size());
3293 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3294 p2i(metadata_begin()),
3295 p2i(metadata_end()),
3296 metadata_size());
3297 #if INCLUDE_JVMCI
3298 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3299 p2i(jvmci_data_begin()),
3300 p2i(jvmci_data_end()),
3301 jvmci_data_size());
3302 #endif
3303 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3304 p2i(immutable_data_begin()),
3305 p2i(immutable_data_end()),
3306 immutable_data_size());
3307 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3308 p2i(dependencies_begin()),
3309 p2i(dependencies_end()),
3310 dependencies_size());
3311 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3312 p2i(nul_chk_table_begin()),
3313 p2i(nul_chk_table_end()),
3314 nul_chk_table_size());
3315 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3316 p2i(handler_table_begin()),
3317 p2i(handler_table_end()),
3318 handler_table_size());
3319 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3320 p2i(scopes_pcs_begin()),
3321 p2i(scopes_pcs_end()),
3322 scopes_pcs_size());
3323 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3324 p2i(scopes_data_begin()),
3325 p2i(scopes_data_end()),
3326 scopes_data_size());
3327 #if INCLUDE_JVMCI
3328 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3329 p2i(speculations_begin()),
3330 p2i(speculations_end()),
3331 speculations_size());
3332 #endif
3333 if (AOTCodeCache::is_on() && _aot_code_entry != nullptr) {
3334 _aot_code_entry->print(st);
3335 }
3336 }
3337
3338 void nmethod::print_code() {
3339 ResourceMark m;
3340 ttyLocker ttyl;
3341 // Call the specialized decode method of this class.
3342 decode(tty);
3343 }
3344
3345 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3346
3347 void nmethod::print_dependencies_on(outputStream* out) {
3348 ResourceMark rm;
3349 stringStream st;
3350 st.print_cr("Dependencies:");
3351 for (Dependencies::DepStream deps(this); deps.next(); ) {
3352 deps.print_dependency(&st);
3353 InstanceKlass* ctxk = deps.context_type();
3354 if (ctxk != nullptr) {
3355 if (ctxk->is_dependent_nmethod(this)) {
3356 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3357 }
3358 }
3359 deps.log_dependency(); // put it into the xml log also
3360 }
3361 out->print_raw(st.as_string());
3362 }
3363 #endif
3364
3365 #if defined(SUPPORT_DATA_STRUCTS)
3366
3367 // Print the oops from the underlying CodeBlob.
3368 void nmethod::print_oops(outputStream* st) {
3369 ResourceMark m;
3370 st->print("Oops:");
3371 if (oops_begin() < oops_end()) {
3372 st->cr();
3373 for (oop* p = oops_begin(); p < oops_end(); p++) {
3374 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3375 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3376 if (Universe::contains_non_oop_word(p)) {
3377 st->print_cr("NON_OOP");
3378 continue; // skip non-oops
3379 }
3380 if (*p == nullptr) {
3381 st->print_cr("nullptr-oop");
3382 continue; // skip non-oops
3383 }
3384 (*p)->print_value_on(st);
3385 st->cr();
3386 }
3387 } else {
3388 st->print_cr(" <list empty>");
3389 }
3390 }
3391
3392 // Print metadata pool.
3393 void nmethod::print_metadata(outputStream* st) {
3394 ResourceMark m;
3395 st->print("Metadata:");
3396 if (metadata_begin() < metadata_end()) {
3397 st->cr();
3398 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3399 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3400 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3401 if (*p && *p != Universe::non_oop_word()) {
3402 (*p)->print_value_on(st);
3403 }
3404 st->cr();
3405 }
3406 } else {
3407 st->print_cr(" <list empty>");
3408 }
3409 }
3410
3411 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3412 void nmethod::print_scopes_on(outputStream* st) {
3413 // Find the first pc desc for all scopes in the code and print it.
3414 ResourceMark rm;
3415 st->print("scopes:");
3416 if (scopes_pcs_begin() < scopes_pcs_end()) {
3417 st->cr();
3418 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3419 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3420 continue;
3421
3422 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3423 while (sd != nullptr) {
3424 sd->print_on(st, p); // print output ends with a newline
3425 sd = sd->sender();
3426 }
3427 }
3428 } else {
3429 st->print_cr(" <list empty>");
3430 }
3431 }
3432 #endif
3433
3434 #ifndef PRODUCT // RelocIterator does support printing only then.
3435 void nmethod::print_relocations_on(outputStream* st) {
3436 ResourceMark m; // in case methods get printed via the debugger
3437 st->print_cr("relocations:");
3438 RelocIterator iter(this);
3439 iter.print_on(st);
3440 }
3441 #endif
3442
3443 void nmethod::print_pcs_on(outputStream* st) {
3444 ResourceMark m; // in case methods get printed via debugger
3445 st->print("pc-bytecode offsets:");
3446 if (scopes_pcs_begin() < scopes_pcs_end()) {
3447 st->cr();
3448 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3449 p->print_on(st, this); // print output ends with a newline
3450 }
3451 } else {
3452 st->print_cr(" <list empty>");
3453 }
3454 }
3455
3456 void nmethod::print_handler_table() {
3457 ExceptionHandlerTable(this).print(code_begin());
3458 }
3459
3460 void nmethod::print_nul_chk_table() {
3461 ImplicitExceptionTable(this).print(code_begin());
3462 }
3463
3464 void nmethod::print_recorded_oop(int log_n, int i) {
3465 void* value;
3466
3467 if (i == 0) {
3468 value = nullptr;
3469 } else {
3470 // Be careful around non-oop words. Don't create an oop
3471 // with that value, or it will assert in verification code.
3472 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3473 value = Universe::non_oop_word();
3474 } else {
3475 value = oop_at(i);
3476 }
3477 }
3478
3479 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3480
3481 if (value == Universe::non_oop_word()) {
3482 tty->print("non-oop word");
3483 } else {
3484 if (value == nullptr) {
3485 tty->print("nullptr-oop");
3486 } else {
3487 oop_at(i)->print_value_on(tty);
3488 }
3489 }
3490
3491 tty->cr();
3492 }
3493
3494 void nmethod::print_recorded_oops() {
3495 const int n = oops_count();
3496 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3497 tty->print("Recorded oops:");
3498 if (n > 0) {
3499 tty->cr();
3500 for (int i = 0; i < n; i++) {
3501 print_recorded_oop(log_n, i);
3502 }
3503 } else {
3504 tty->print_cr(" <list empty>");
3505 }
3506 }
3507
3508 void nmethod::print_recorded_metadata() {
3509 const int n = metadata_count();
3510 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3511 tty->print("Recorded metadata:");
3512 if (n > 0) {
3513 tty->cr();
3514 for (int i = 0; i < n; i++) {
3515 Metadata* m = metadata_at(i);
3516 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3517 if (m == (Metadata*)Universe::non_oop_word()) {
3518 tty->print("non-metadata word");
3519 } else if (m == nullptr) {
3520 tty->print("nullptr-oop");
3521 } else {
3522 Metadata::print_value_on_maybe_null(tty, m);
3523 }
3524 tty->cr();
3525 }
3526 } else {
3527 tty->print_cr(" <list empty>");
3528 }
3529 }
3530 #endif
3531
3532 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3533
3534 void nmethod::print_constant_pool(outputStream* st) {
3535 //-----------------------------------
3536 //---< Print the constant pool >---
3537 //-----------------------------------
3538 int consts_size = this->consts_size();
3539 if ( consts_size > 0 ) {
3540 unsigned char* cstart = this->consts_begin();
3541 unsigned char* cp = cstart;
3542 unsigned char* cend = cp + consts_size;
3543 unsigned int bytes_per_line = 4;
3544 unsigned int CP_alignment = 8;
3545 unsigned int n;
3546
3547 st->cr();
3548
3549 //---< print CP header to make clear what's printed >---
3550 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3551 n = bytes_per_line;
3552 st->print_cr("[Constant Pool]");
3553 Disassembler::print_location(cp, cstart, cend, st, true, true);
3554 Disassembler::print_hexdata(cp, n, st, true);
3555 st->cr();
3556 } else {
3557 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3558 st->print_cr("[Constant Pool (unaligned)]");
3559 }
3560
3561 //---< print CP contents, bytes_per_line at a time >---
3562 while (cp < cend) {
3563 Disassembler::print_location(cp, cstart, cend, st, true, false);
3564 Disassembler::print_hexdata(cp, n, st, false);
3565 cp += n;
3566 n = bytes_per_line;
3567 st->cr();
3568 }
3569
3570 //---< Show potential alignment gap between constant pool and code >---
3571 cend = code_begin();
3572 if( cp < cend ) {
3573 n = 4;
3574 st->print_cr("[Code entry alignment]");
3575 while (cp < cend) {
3576 Disassembler::print_location(cp, cstart, cend, st, false, false);
3577 cp += n;
3578 st->cr();
3579 }
3580 }
3581 } else {
3582 st->print_cr("[Constant Pool (empty)]");
3583 }
3584 st->cr();
3585 }
3586
3587 #endif
3588
3589 // Disassemble this nmethod.
3590 // Print additional debug information, if requested. This could be code
3591 // comments, block comments, profiling counters, etc.
3592 // The undisassembled format is useful no disassembler library is available.
3593 // The resulting hex dump (with markers) can be disassembled later, or on
3594 // another system, when/where a disassembler library is available.
3595 void nmethod::decode2(outputStream* ost) const {
3596
3597 // Called from frame::back_trace_with_decode without ResourceMark.
3598 ResourceMark rm;
3599
3600 // Make sure we have a valid stream to print on.
3601 outputStream* st = ost ? ost : tty;
3602
3603 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3604 const bool use_compressed_format = true;
3605 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3606 AbstractDisassembler::show_block_comment());
3607 #else
3608 const bool use_compressed_format = Disassembler::is_abstract();
3609 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3610 AbstractDisassembler::show_block_comment());
3611 #endif
3612
3613 st->cr();
3614 this->print_on(st);
3615 st->cr();
3616
3617 #if defined(SUPPORT_ASSEMBLY)
3618 //----------------------------------
3619 //---< Print real disassembly >---
3620 //----------------------------------
3621 if (! use_compressed_format) {
3622 st->print_cr("[Disassembly]");
3623 Disassembler::decode(const_cast<nmethod*>(this), st);
3624 st->bol();
3625 st->print_cr("[/Disassembly]");
3626 return;
3627 }
3628 #endif
3629
3630 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3631
3632 // Compressed undisassembled disassembly format.
3633 // The following status values are defined/supported:
3634 // = 0 - currently at bol() position, nothing printed yet on current line.
3635 // = 1 - currently at position after print_location().
3636 // > 1 - in the midst of printing instruction stream bytes.
3637 int compressed_format_idx = 0;
3638 int code_comment_column = 0;
3639 const int instr_maxlen = Assembler::instr_maxlen();
3640 const uint tabspacing = 8;
3641 unsigned char* start = this->code_begin();
3642 unsigned char* p = this->code_begin();
3643 unsigned char* end = this->code_end();
3644 unsigned char* pss = p; // start of a code section (used for offsets)
3645
3646 if ((start == nullptr) || (end == nullptr)) {
3647 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3648 return;
3649 }
3650 #endif
3651
3652 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3653 //---< plain abstract disassembly, no comments or anything, just section headers >---
3654 if (use_compressed_format && ! compressed_with_comments) {
3655 const_cast<nmethod*>(this)->print_constant_pool(st);
3656
3657 st->bol();
3658 st->cr();
3659 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3660 //---< Open the output (Marker for post-mortem disassembler) >---
3661 st->print_cr("[MachCode]");
3662 const char* header = nullptr;
3663 address p0 = p;
3664 while (p < end) {
3665 address pp = p;
3666 while ((p < end) && (header == nullptr)) {
3667 header = nmethod_section_label(p);
3668 pp = p;
3669 p += Assembler::instr_len(p);
3670 }
3671 if (pp > p0) {
3672 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3673 p0 = pp;
3674 p = pp;
3675 header = nullptr;
3676 } else if (header != nullptr) {
3677 st->bol();
3678 st->print_cr("%s", header);
3679 header = nullptr;
3680 }
3681 }
3682 //---< Close the output (Marker for post-mortem disassembler) >---
3683 st->bol();
3684 st->print_cr("[/MachCode]");
3685 return;
3686 }
3687 #endif
3688
3689 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3690 //---< abstract disassembly with comments and section headers merged in >---
3691 if (compressed_with_comments) {
3692 const_cast<nmethod*>(this)->print_constant_pool(st);
3693
3694 st->bol();
3695 st->cr();
3696 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3697 //---< Open the output (Marker for post-mortem disassembler) >---
3698 st->print_cr("[MachCode]");
3699 while ((p < end) && (p != nullptr)) {
3700 const int instruction_size_in_bytes = Assembler::instr_len(p);
3701
3702 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3703 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3704 // Prints nmethod_section_label as well.
3705 if (AbstractDisassembler::show_block_comment()) {
3706 print_block_comment(st, p);
3707 if (st->position() == 0) {
3708 compressed_format_idx = 0;
3709 }
3710 }
3711
3712 //---< New location information after line break >---
3713 if (compressed_format_idx == 0) {
3714 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3715 compressed_format_idx = 1;
3716 }
3717
3718 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3719 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3720 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3721
3722 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3723 //---< interrupt instruction byte stream for code comment >---
3724 if (compressed_format_idx > 1) {
3725 st->cr(); // interrupt byte stream
3726 st->cr(); // add an empty line
3727 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3728 }
3729 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3730 st->bol();
3731 compressed_format_idx = 0;
3732 }
3733
3734 //---< New location information after line break >---
3735 if (compressed_format_idx == 0) {
3736 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3737 compressed_format_idx = 1;
3738 }
3739
3740 //---< Nicely align instructions for readability >---
3741 if (compressed_format_idx > 1) {
3742 Disassembler::print_delimiter(st);
3743 }
3744
3745 //---< Now, finally, print the actual instruction bytes >---
3746 unsigned char* p0 = p;
3747 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3748 compressed_format_idx += (int)(p - p0);
3749
3750 if (Disassembler::start_newline(compressed_format_idx-1)) {
3751 st->cr();
3752 compressed_format_idx = 0;
3753 }
3754 }
3755 //---< Close the output (Marker for post-mortem disassembler) >---
3756 st->bol();
3757 st->print_cr("[/MachCode]");
3758 return;
3759 }
3760 #endif
3761 }
3762
3763 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3764
3765 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3766 RelocIterator iter(this, begin, end);
3767 bool have_one = false;
3768 while (iter.next()) {
3769 have_one = true;
3770 switch (iter.type()) {
3771 case relocInfo::none: {
3772 // Skip it and check next
3773 break;
3774 }
3775 case relocInfo::oop_type: {
3776 // Get a non-resizable resource-allocated stringStream.
3777 // Our callees make use of (nested) ResourceMarks.
3778 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3779 oop_Relocation* r = iter.oop_reloc();
3780 oop obj = r->oop_value();
3781 st.print("oop(");
3782 if (obj == nullptr) st.print("nullptr");
3783 else obj->print_value_on(&st);
3784 st.print(")");
3785 return st.as_string();
3786 }
3787 case relocInfo::metadata_type: {
3788 stringStream st;
3789 metadata_Relocation* r = iter.metadata_reloc();
3790 Metadata* obj = r->metadata_value();
3791 st.print("metadata(");
3792 if (obj == nullptr) st.print("nullptr");
3793 else obj->print_value_on(&st);
3794 st.print(")");
3795 return st.as_string();
3796 }
3797 case relocInfo::runtime_call_type:
3798 case relocInfo::runtime_call_w_cp_type: {
3799 stringStream st;
3800 st.print("runtime_call");
3801 CallRelocation* r = (CallRelocation*)iter.reloc();
3802 address dest = r->destination();
3803 if (StubRoutines::contains(dest)) {
3804 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3805 if (desc == nullptr) {
3806 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3807 }
3808 if (desc != nullptr) {
3809 st.print(" Stub::%s", desc->name());
3810 return st.as_string();
3811 }
3812 }
3813 CodeBlob* cb = CodeCache::find_blob(dest);
3814 if (cb != nullptr) {
3815 st.print(" %s", cb->name());
3816 } else {
3817 ResourceMark rm;
3818 const int buflen = 1024;
3819 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3820 int offset;
3821 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3822 st.print(" %s", buf);
3823 if (offset != 0) {
3824 st.print("+%d", offset);
3825 }
3826 }
3827 }
3828 return st.as_string();
3829 }
3830 case relocInfo::virtual_call_type: {
3831 stringStream st;
3832 st.print_raw("virtual_call");
3833 virtual_call_Relocation* r = iter.virtual_call_reloc();
3834 Method* m = r->method_value();
3835 if (m != nullptr) {
3836 assert(m->is_method(), "");
3837 m->print_short_name(&st);
3838 }
3839 return st.as_string();
3840 }
3841 case relocInfo::opt_virtual_call_type: {
3842 stringStream st;
3843 st.print_raw("optimized virtual_call");
3844 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3845 Method* m = r->method_value();
3846 if (m != nullptr) {
3847 assert(m->is_method(), "");
3848 m->print_short_name(&st);
3849 }
3850 return st.as_string();
3851 }
3852 case relocInfo::static_call_type: {
3853 stringStream st;
3854 st.print_raw("static_call");
3855 static_call_Relocation* r = iter.static_call_reloc();
3856 Method* m = r->method_value();
3857 if (m != nullptr) {
3858 assert(m->is_method(), "");
3859 m->print_short_name(&st);
3860 }
3861 return st.as_string();
3862 }
3863 case relocInfo::static_stub_type: return "static_stub";
3864 case relocInfo::external_word_type: return "external_word";
3865 case relocInfo::internal_word_type: return "internal_word";
3866 case relocInfo::section_word_type: return "section_word";
3867 case relocInfo::poll_type: return "poll";
3868 case relocInfo::poll_return_type: return "poll_return";
3869 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3870 case relocInfo::entry_guard_type: return "entry_guard";
3871 case relocInfo::post_call_nop_type: return "post_call_nop";
3872 case relocInfo::barrier_type: {
3873 barrier_Relocation* const reloc = iter.barrier_reloc();
3874 stringStream st;
3875 st.print("barrier format=%d", reloc->format());
3876 return st.as_string();
3877 }
3878
3879 case relocInfo::type_mask: return "type_bit_mask";
3880
3881 default: {
3882 stringStream st;
3883 st.print("unknown relocInfo=%d", (int) iter.type());
3884 return st.as_string();
3885 }
3886 }
3887 }
3888 return have_one ? "other" : nullptr;
3889 }
3890
3891 // Return the last scope in (begin..end]
3892 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3893 PcDesc* p = pc_desc_near(begin+1);
3894 if (p != nullptr && p->real_pc(this) <= end) {
3895 return new ScopeDesc(this, p);
3896 }
3897 return nullptr;
3898 }
3899
3900 const char* nmethod::nmethod_section_label(address pos) const {
3901 const char* label = nullptr;
3902 if (pos == code_begin()) label = "[Instructions begin]";
3903 if (pos == entry_point()) label = "[Entry Point]";
3904 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3905 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3906 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3907 // Check stub_code before checking exception_handler or deopt_handler.
3908 if (pos == this->stub_begin()) label = "[Stub Code]";
3909 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3910 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3911 return label;
3912 }
3913
3914 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3915 if (print_section_labels) {
3916 const char* label = nmethod_section_label(block_begin);
3917 if (label != nullptr) {
3918 stream->bol();
3919 stream->print_cr("%s", label);
3920 }
3921 }
3922
3923 if (block_begin == entry_point()) {
3924 Method* m = method();
3925 if (m != nullptr) {
3926 stream->print(" # ");
3927 m->print_value_on(stream);
3928 stream->cr();
3929 }
3930 if (m != nullptr && !is_osr_method()) {
3931 ResourceMark rm;
3932 int sizeargs = m->size_of_parameters();
3933 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3934 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3935 {
3936 int sig_index = 0;
3937 if (!m->is_static())
3938 sig_bt[sig_index++] = T_OBJECT; // 'this'
3939 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3940 BasicType t = ss.type();
3941 sig_bt[sig_index++] = t;
3942 if (type2size[t] == 2) {
3943 sig_bt[sig_index++] = T_VOID;
3944 } else {
3945 assert(type2size[t] == 1, "size is 1 or 2");
3946 }
3947 }
3948 assert(sig_index == sizeargs, "");
3949 }
3950 const char* spname = "sp"; // make arch-specific?
3951 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3952 int stack_slot_offset = this->frame_size() * wordSize;
3953 int tab1 = 14, tab2 = 24;
3954 int sig_index = 0;
3955 int arg_index = (m->is_static() ? 0 : -1);
3956 bool did_old_sp = false;
3957 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3958 bool at_this = (arg_index == -1);
3959 bool at_old_sp = false;
3960 BasicType t = (at_this ? T_OBJECT : ss.type());
3961 assert(t == sig_bt[sig_index], "sigs in sync");
3962 if (at_this)
3963 stream->print(" # this: ");
3964 else
3965 stream->print(" # parm%d: ", arg_index);
3966 stream->move_to(tab1);
3967 VMReg fst = regs[sig_index].first();
3968 VMReg snd = regs[sig_index].second();
3969 if (fst->is_reg()) {
3970 stream->print("%s", fst->name());
3971 if (snd->is_valid()) {
3972 stream->print(":%s", snd->name());
3973 }
3974 } else if (fst->is_stack()) {
3975 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3976 if (offset == stack_slot_offset) at_old_sp = true;
3977 stream->print("[%s+0x%x]", spname, offset);
3978 } else {
3979 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3980 }
3981 stream->print(" ");
3982 stream->move_to(tab2);
3983 stream->print("= ");
3984 if (at_this) {
3985 m->method_holder()->print_value_on(stream);
3986 } else {
3987 bool did_name = false;
3988 if (!at_this && ss.is_reference()) {
3989 Symbol* name = ss.as_symbol();
3990 name->print_value_on(stream);
3991 did_name = true;
3992 }
3993 if (!did_name)
3994 stream->print("%s", type2name(t));
3995 }
3996 if (at_old_sp) {
3997 stream->print(" (%s of caller)", spname);
3998 did_old_sp = true;
3999 }
4000 stream->cr();
4001 sig_index += type2size[t];
4002 arg_index += 1;
4003 if (!at_this) ss.next();
4004 }
4005 if (!did_old_sp) {
4006 stream->print(" # ");
4007 stream->move_to(tab1);
4008 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4009 stream->print(" (%s of caller)", spname);
4010 stream->cr();
4011 }
4012 }
4013 }
4014 }
4015
4016 // Returns whether this nmethod has code comments.
4017 bool nmethod::has_code_comment(address begin, address end) {
4018 // scopes?
4019 ScopeDesc* sd = scope_desc_in(begin, end);
4020 if (sd != nullptr) return true;
4021
4022 // relocations?
4023 const char* str = reloc_string_for(begin, end);
4024 if (str != nullptr) return true;
4025
4026 // implicit exceptions?
4027 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4028 if (cont_offset != 0) return true;
4029
4030 return false;
4031 }
4032
4033 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4034 ImplicitExceptionTable implicit_table(this);
4035 int pc_offset = (int)(begin - code_begin());
4036 int cont_offset = implicit_table.continuation_offset(pc_offset);
4037 bool oop_map_required = false;
4038 if (cont_offset != 0) {
4039 st->move_to(column, 6, 0);
4040 if (pc_offset == cont_offset) {
4041 st->print("; implicit exception: deoptimizes");
4042 oop_map_required = true;
4043 } else {
4044 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4045 }
4046 }
4047
4048 // Find an oopmap in (begin, end]. We use the odd half-closed
4049 // interval so that oop maps and scope descs which are tied to the
4050 // byte after a call are printed with the call itself. OopMaps
4051 // associated with implicit exceptions are printed with the implicit
4052 // instruction.
4053 address base = code_begin();
4054 ImmutableOopMapSet* oms = oop_maps();
4055 if (oms != nullptr) {
4056 for (int i = 0, imax = oms->count(); i < imax; i++) {
4057 const ImmutableOopMapPair* pair = oms->pair_at(i);
4058 const ImmutableOopMap* om = pair->get_from(oms);
4059 address pc = base + pair->pc_offset();
4060 if (pc >= begin) {
4061 #if INCLUDE_JVMCI
4062 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4063 #else
4064 bool is_implicit_deopt = false;
4065 #endif
4066 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4067 st->move_to(column, 6, 0);
4068 st->print("; ");
4069 om->print_on(st);
4070 oop_map_required = false;
4071 }
4072 }
4073 if (pc > end) {
4074 break;
4075 }
4076 }
4077 }
4078 assert(!oop_map_required, "missed oopmap");
4079
4080 Thread* thread = Thread::current();
4081
4082 // Print any debug info present at this pc.
4083 ScopeDesc* sd = scope_desc_in(begin, end);
4084 if (sd != nullptr) {
4085 st->move_to(column, 6, 0);
4086 if (sd->bci() == SynchronizationEntryBCI) {
4087 st->print(";*synchronization entry");
4088 } else if (sd->bci() == AfterBci) {
4089 st->print(";* method exit (unlocked if synchronized)");
4090 } else if (sd->bci() == UnwindBci) {
4091 st->print(";* unwind (locked if synchronized)");
4092 } else if (sd->bci() == AfterExceptionBci) {
4093 st->print(";* unwind (unlocked if synchronized)");
4094 } else if (sd->bci() == UnknownBci) {
4095 st->print(";* unknown");
4096 } else if (sd->bci() == InvalidFrameStateBci) {
4097 st->print(";* invalid frame state");
4098 } else {
4099 if (sd->method() == nullptr) {
4100 st->print("method is nullptr");
4101 } else if (sd->method()->is_native()) {
4102 st->print("method is native");
4103 } else {
4104 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4105 st->print(";*%s", Bytecodes::name(bc));
4106 switch (bc) {
4107 case Bytecodes::_invokevirtual:
4108 case Bytecodes::_invokespecial:
4109 case Bytecodes::_invokestatic:
4110 case Bytecodes::_invokeinterface:
4111 {
4112 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4113 st->print(" ");
4114 if (invoke.name() != nullptr)
4115 invoke.name()->print_symbol_on(st);
4116 else
4117 st->print("<UNKNOWN>");
4118 break;
4119 }
4120 case Bytecodes::_getfield:
4121 case Bytecodes::_putfield:
4122 case Bytecodes::_getstatic:
4123 case Bytecodes::_putstatic:
4124 {
4125 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4126 st->print(" ");
4127 if (field.name() != nullptr)
4128 field.name()->print_symbol_on(st);
4129 else
4130 st->print("<UNKNOWN>");
4131 }
4132 default:
4133 break;
4134 }
4135 }
4136 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4137 }
4138
4139 // Print all scopes
4140 for (;sd != nullptr; sd = sd->sender()) {
4141 st->move_to(column, 6, 0);
4142 st->print("; -");
4143 if (sd->should_reexecute()) {
4144 st->print(" (reexecute)");
4145 }
4146 if (sd->method() == nullptr) {
4147 st->print("method is nullptr");
4148 } else {
4149 sd->method()->print_short_name(st);
4150 }
4151 int lineno = sd->method()->line_number_from_bci(sd->bci());
4152 if (lineno != -1) {
4153 st->print("@%d (line %d)", sd->bci(), lineno);
4154 } else {
4155 st->print("@%d", sd->bci());
4156 }
4157 st->cr();
4158 }
4159 }
4160
4161 // Print relocation information
4162 // Prevent memory leak: allocating without ResourceMark.
4163 ResourceMark rm;
4164 const char* str = reloc_string_for(begin, end);
4165 if (str != nullptr) {
4166 if (sd != nullptr) st->cr();
4167 st->move_to(column, 6, 0);
4168 st->print("; {%s}", str);
4169 }
4170 }
4171
4172 #endif
4173
4174 address nmethod::call_instruction_address(address pc) const {
4175 if (NativeCall::is_call_before(pc)) {
4176 NativeCall *ncall = nativeCall_before(pc);
4177 return ncall->instruction_address();
4178 }
4179 return nullptr;
4180 }
4181
4182 void nmethod::print_value_on_impl(outputStream* st) const {
4183 st->print_cr("nmethod");
4184 #if defined(SUPPORT_DATA_STRUCTS)
4185 print_on_with_msg(st, nullptr);
4186 #endif
4187 }
4188
4189 #ifndef PRODUCT
4190
4191 void nmethod::print_calls(outputStream* st) {
4192 RelocIterator iter(this);
4193 while (iter.next()) {
4194 switch (iter.type()) {
4195 case relocInfo::virtual_call_type: {
4196 CompiledICLocker ml_verify(this);
4197 CompiledIC_at(&iter)->print();
4198 break;
4199 }
4200 case relocInfo::static_call_type:
4201 case relocInfo::opt_virtual_call_type:
4202 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4203 CompiledDirectCall::at(iter.reloc())->print();
4204 break;
4205 default:
4206 break;
4207 }
4208 }
4209 }
4210
4211 void nmethod::print_statistics() {
4212 ttyLocker ttyl;
4213 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4214 native_nmethod_stats.print_native_nmethod_stats();
4215 #ifdef COMPILER1
4216 c1_java_nmethod_stats.print_nmethod_stats("C1");
4217 #endif
4218 #ifdef COMPILER2
4219 c2_java_nmethod_stats.print_nmethod_stats("C2");
4220 #endif
4221 #if INCLUDE_JVMCI
4222 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4223 #endif
4224 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4225 DebugInformationRecorder::print_statistics();
4226 pc_nmethod_stats.print_pc_stats();
4227 Dependencies::print_statistics();
4228 ExternalsRecorder::print_statistics();
4229 if (xtty != nullptr) xtty->tail("statistics");
4230 }
4231
4232 #endif // !PRODUCT
4233
4234 #if INCLUDE_JVMCI
4235 void nmethod::update_speculation(JavaThread* thread) {
4236 jlong speculation = thread->pending_failed_speculation();
4237 if (speculation != 0) {
4238 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4239 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4240 thread->set_pending_failed_speculation(0);
4241 }
4242 }
4243
4244 const char* nmethod::jvmci_name() {
4245 if (jvmci_nmethod_data() != nullptr) {
4246 return jvmci_nmethod_data()->name();
4247 }
4248 return nullptr;
4249 }
4250
4251 bool nmethod::jvmci_skip_profile_deopt() const {
4252 return jvmci_nmethod_data() != nullptr && !jvmci_nmethod_data()->profile_deopt();
4253 }
4254 #endif
4255
4256 void nmethod::prepare_for_archiving_impl() {
4257 CodeBlob::prepare_for_archiving_impl();
4258 _deoptimization_generation = 0;
4259 _gc_epoch = 0;
4260 _method_profiling_count = 0;
4261 _osr_link = nullptr;
4262 _method = nullptr;
4263 _immutable_data = nullptr;
4264 _pc_desc_container = nullptr;
4265 _exception_cache = nullptr;
4266 _gc_data = nullptr;
4267 _oops_do_mark_link = nullptr;
4268 _compiled_ic_data = nullptr;
4269 _osr_entry_point = nullptr;
4270 _compile_id = -1;
4271 _deoptimization_status = not_marked;
4272 _is_unloading_state = 0;
4273 _state = not_installed;
4274 }