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 "cds/cdsConfig.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.inline.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "compiler/oopMap.inline.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/barrierSetNMethod.hpp"
45 #include "gc/shared/classUnloadingContext.hpp"
46 #include "gc/shared/collectedHeap.hpp"
47 #include "interpreter/bytecode.inline.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/weakHandle.inline.hpp"
60 #include "prims/jvmtiImpl.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/atomicAccess.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #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 AtomicAccess::load(&_next);
381 }
382
383 void ExceptionCache::set_next(ExceptionCache *ec) {
384 AtomicAccess::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 // Returns a string version of the method state.
470 const char* nmethod::state() const {
471 int state = get_state();
472 switch (state) {
473 case not_installed:
474 return "not installed";
475 case in_use:
476 return "in use";
477 case not_entrant:
478 return "not_entrant";
479 default:
480 fatal("unexpected method state: %d", state);
481 return nullptr;
482 }
483 }
484
485 void nmethod::set_deoptimized_done() {
486 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
487 if (_deoptimization_status != deoptimize_done) { // can't go backwards
488 AtomicAccess::store(&_deoptimization_status, deoptimize_done);
489 }
490 }
491
492 ExceptionCache* nmethod::exception_cache_acquire() const {
493 return AtomicAccess::load_acquire(&_exception_cache);
494 }
495
496 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
497 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
498 assert(new_entry != nullptr,"Must be non null");
499 assert(new_entry->next() == nullptr, "Must be null");
500
501 for (;;) {
502 ExceptionCache *ec = exception_cache();
503 if (ec != nullptr) {
504 Klass* ex_klass = ec->exception_type();
505 if (!ex_klass->is_loader_alive()) {
506 // We must guarantee that entries are not inserted with new next pointer
507 // edges to ExceptionCache entries with dead klasses, due to bad interactions
508 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
509 // the head pointer forward to the first live ExceptionCache, so that the new
510 // next pointers always point at live ExceptionCaches, that are not removed due
511 // to concurrent ExceptionCache cleanup.
512 ExceptionCache* next = ec->next();
513 if (AtomicAccess::cmpxchg(&_exception_cache, ec, next) == ec) {
514 CodeCache::release_exception_cache(ec);
515 }
516 continue;
517 }
518 ec = exception_cache();
519 if (ec != nullptr) {
520 new_entry->set_next(ec);
521 }
522 }
523 if (AtomicAccess::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
524 return;
525 }
526 }
527 }
528
529 void nmethod::clean_exception_cache() {
530 // For each nmethod, only a single thread may call this cleanup function
531 // at the same time, whether called in STW cleanup or concurrent cleanup.
532 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
533 // then a single writer may contend with cleaning up the head pointer to the
534 // first ExceptionCache node that has a Klass* that is alive. That is fine,
535 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
536 // And the concurrent writers do not clean up next pointers, only the head.
537 // Also note that concurrent readers will walk through Klass* pointers that are not
538 // alive. That does not cause ABA problems, because Klass* is deleted after
539 // a handshake with all threads, after all stale ExceptionCaches have been
540 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
541 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
542 // That similarly implies that CAS operations on ExceptionCache entries do not
543 // suffer from ABA problems as unlinking and deletion is separated by a global
544 // handshake operation.
545 ExceptionCache* prev = nullptr;
546 ExceptionCache* curr = exception_cache_acquire();
547
548 while (curr != nullptr) {
549 ExceptionCache* next = curr->next();
550
551 if (!curr->exception_type()->is_loader_alive()) {
552 if (prev == nullptr) {
553 // Try to clean head; this is contended by concurrent inserts, that
554 // both lazily clean the head, and insert entries at the head. If
555 // the CAS fails, the operation is restarted.
556 if (AtomicAccess::cmpxchg(&_exception_cache, curr, next) != curr) {
557 prev = nullptr;
558 curr = exception_cache_acquire();
559 continue;
560 }
561 } else {
562 // It is impossible to during cleanup connect the next pointer to
563 // an ExceptionCache that has not been published before a safepoint
564 // prior to the cleanup. Therefore, release is not required.
565 prev->set_next(next);
566 }
567 // prev stays the same.
568
569 CodeCache::release_exception_cache(curr);
570 } else {
571 prev = curr;
572 }
573
574 curr = next;
575 }
576 }
577
578 // public method for accessing the exception cache
579 // These are the public access methods.
580 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
581 // We never grab a lock to read the exception cache, so we may
582 // have false negatives. This is okay, as it can only happen during
583 // the first few exception lookups for a given nmethod.
584 ExceptionCache* ec = exception_cache_acquire();
585 while (ec != nullptr) {
586 address ret_val;
587 if ((ret_val = ec->match(exception,pc)) != nullptr) {
588 return ret_val;
589 }
590 ec = ec->next();
591 }
592 return nullptr;
593 }
594
595 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
596 // There are potential race conditions during exception cache updates, so we
597 // must own the ExceptionCache_lock before doing ANY modifications. Because
598 // we don't lock during reads, it is possible to have several threads attempt
599 // to update the cache with the same data. We need to check for already inserted
600 // copies of the current data before adding it.
601
602 MutexLocker ml(ExceptionCache_lock);
603 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
604
605 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
606 target_entry = new ExceptionCache(exception,pc,handler);
607 add_exception_cache_entry(target_entry);
608 }
609 }
610
611 // private method for handling exception cache
612 // These methods are private, and used to manipulate the exception cache
613 // directly.
614 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
615 ExceptionCache* ec = exception_cache_acquire();
616 while (ec != nullptr) {
617 if (ec->match_exception_with_space(exception)) {
618 return ec;
619 }
620 ec = ec->next();
621 }
622 return nullptr;
623 }
624
625 bool nmethod::is_at_poll_return(address pc) {
626 RelocIterator iter(this, pc, pc+1);
627 while (iter.next()) {
628 if (iter.type() == relocInfo::poll_return_type)
629 return true;
630 }
631 return false;
632 }
633
634
635 bool nmethod::is_at_poll_or_poll_return(address pc) {
636 RelocIterator iter(this, pc, pc+1);
637 while (iter.next()) {
638 relocInfo::relocType t = iter.type();
639 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
640 return true;
641 }
642 return false;
643 }
644
645 void nmethod::verify_oop_relocations() {
646 // Ensure sure that the code matches the current oop values
647 RelocIterator iter(this, nullptr, nullptr);
648 while (iter.next()) {
649 if (iter.type() == relocInfo::oop_type) {
650 oop_Relocation* reloc = iter.oop_reloc();
651 if (!reloc->oop_is_immediate()) {
652 reloc->verify_oop_relocation();
653 }
654 }
655 }
656 }
657
658
659 ScopeDesc* nmethod::scope_desc_at(address pc) {
660 PcDesc* pd = pc_desc_at(pc);
661 guarantee(pd != nullptr, "scope must be present");
662 return new ScopeDesc(this, pd);
663 }
664
665 ScopeDesc* nmethod::scope_desc_near(address pc) {
666 PcDesc* pd = pc_desc_near(pc);
667 guarantee(pd != nullptr, "scope must be present");
668 return new ScopeDesc(this, pd);
669 }
670
671 address nmethod::oops_reloc_begin() const {
672 // If the method is not entrant then a JMP is plastered over the
673 // first few bytes. If an oop in the old code was there, that oop
674 // should not get GC'd. Skip the first few bytes of oops on
675 // not-entrant methods.
676 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
677 code_begin() + frame_complete_offset() >
678 verified_entry_point() + NativeJump::instruction_size)
679 {
680 // If we have a frame_complete_offset after the native jump, then there
681 // is no point trying to look for oops before that. This is a requirement
682 // for being allowed to scan oops concurrently.
683 return code_begin() + frame_complete_offset();
684 }
685
686 address low_boundary = verified_entry_point();
687 return low_boundary;
688 }
689
690 // Method that knows how to preserve outgoing arguments at call. This method must be
691 // called with a frame corresponding to a Java invoke
692 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
693 if (method() == nullptr) {
694 return;
695 }
696
697 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
698 JavaThread* thread = reg_map->thread();
699 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
700 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
701 return;
702 }
703
704 if (!method()->is_native()) {
705 address pc = fr.pc();
706 bool has_receiver, has_appendix;
707 Symbol* signature;
708
709 // The method attached by JIT-compilers should be used, if present.
710 // Bytecode can be inaccurate in such case.
711 Method* callee = attached_method_before_pc(pc);
712 if (callee != nullptr) {
713 has_receiver = !(callee->access_flags().is_static());
714 has_appendix = false;
715 signature = callee->signature();
716 } else {
717 SimpleScopeDesc ssd(this, pc);
718
719 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
720 has_receiver = call.has_receiver();
721 has_appendix = call.has_appendix();
722 signature = call.signature();
723 }
724
725 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
726 } else if (method()->is_continuation_enter_intrinsic()) {
727 // This method only calls Continuation.enter()
728 Symbol* signature = vmSymbols::continuationEnter_signature();
729 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
730 }
731 }
732
733 Method* nmethod::attached_method(address call_instr) {
734 assert(code_contains(call_instr), "not part of the nmethod");
735 RelocIterator iter(this, call_instr, call_instr + 1);
736 while (iter.next()) {
737 if (iter.addr() == call_instr) {
738 switch(iter.type()) {
739 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
740 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
741 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
742 default: break;
743 }
744 }
745 }
746 return nullptr; // not found
747 }
748
749 Method* nmethod::attached_method_before_pc(address pc) {
750 if (NativeCall::is_call_before(pc)) {
751 NativeCall* ncall = nativeCall_before(pc);
752 return attached_method(ncall->instruction_address());
753 }
754 return nullptr; // not a call
755 }
756
757 void nmethod::clear_inline_caches() {
758 assert(SafepointSynchronize::is_at_safepoint() || (NMethodState_lock->owned_by_self() && is_not_installed()), "clearing of IC's only allowed at safepoint or when not installed");
759 RelocIterator iter(this);
760 while (iter.next()) {
761 iter.reloc()->clear_inline_cache();
762 }
763 }
764
765 #ifdef ASSERT
766 // Check class_loader is alive for this bit of metadata.
767 class CheckClass : public MetadataClosure {
768 void do_metadata(Metadata* md) {
769 Klass* klass = nullptr;
770 if (md->is_klass()) {
771 klass = ((Klass*)md);
772 } else if (md->is_method()) {
773 klass = ((Method*)md)->method_holder();
774 } else if (md->is_methodData()) {
775 klass = ((MethodData*)md)->method()->method_holder();
776 } else if (md->is_methodCounters()) {
777 klass = ((MethodCounters*)md)->method()->method_holder();
778 } else {
779 md->print();
780 ShouldNotReachHere();
781 }
782 assert(klass->is_loader_alive(), "must be alive");
783 }
784 };
785 #endif // ASSERT
786
787 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
788 template <typename CallsiteT>
789 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, bool clean_all) {
790 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
791 if (!cb->is_nmethod()) {
792 return;
793 }
794 nmethod* nm = cb->as_nmethod();
795 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
796 callsite->set_to_clean();
797 }
798 }
799
800 // Cleans caches in nmethods that point to either classes that are unloaded
801 // or nmethods that are unloaded.
802 //
803 // Can be called either in parallel by G1 currently or after all
804 // nmethods are unloaded. Return postponed=true in the parallel case for
805 // inline caches found that point to nmethods that are not yet visited during
806 // the do_unloading walk.
807 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
808 ResourceMark rm;
809
810 // Exception cache only needs to be called if unloading occurred
811 if (unloading_occurred) {
812 clean_exception_cache();
813 }
814
815 cleanup_inline_caches_impl(unloading_occurred, false);
816
817 #ifdef ASSERT
818 // Check that the metadata embedded in the nmethod is alive
819 CheckClass check_class;
820 metadata_do(&check_class);
821 #endif
822 }
823
824 void nmethod::run_nmethod_entry_barrier() {
825 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
826 if (bs_nm != nullptr) {
827 // We want to keep an invariant that nmethods found through iterations of a Thread's
828 // nmethods found in safepoints have gone through an entry barrier and are not armed.
829 // By calling this nmethod entry barrier, it plays along and acts
830 // like any other nmethod found on the stack of a thread (fewer surprises).
831 nmethod* nm = this;
832 bool alive = bs_nm->nmethod_entry_barrier(nm);
833 assert(alive, "should be alive");
834 }
835 }
836
837 // Only called by whitebox test
838 void nmethod::cleanup_inline_caches_whitebox() {
839 assert_locked_or_safepoint(CodeCache_lock);
840 CompiledICLocker ic_locker(this);
841 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
842 }
843
844 address* nmethod::orig_pc_addr(const frame* fr) {
845 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
846 }
847
848 // Called to clean up after class unloading for live nmethods
849 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
850 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
851 ResourceMark rm;
852
853 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
854 RelocIterator iter(this, oops_reloc_begin());
855 bool is_in_static_stub = false;
856 while(iter.next()) {
857
858 switch (iter.type()) {
859
860 case relocInfo::virtual_call_type:
861 if (unloading_occurred) {
862 // If class unloading occurred we first clear ICs where the cached metadata
863 // is referring to an unloaded klass or method.
864 CompiledIC_at(&iter)->clean_metadata();
865 }
866
867 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), clean_all);
868 break;
869
870 case relocInfo::opt_virtual_call_type:
871 case relocInfo::static_call_type:
872 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), clean_all);
873 break;
874
875 case relocInfo::static_stub_type: {
876 is_in_static_stub = true;
877 break;
878 }
879
880 case relocInfo::metadata_type: {
881 // Only the metadata relocations contained in static/opt virtual call stubs
882 // contains the Method* passed to c2i adapters. It is the only metadata
883 // relocation that needs to be walked, as it is the one metadata relocation
884 // that violates the invariant that all metadata relocations have an oop
885 // in the compiled method (due to deferred resolution and code patching).
886
887 // This causes dead metadata to remain in compiled methods that are not
888 // unloading. Unless these slippery metadata relocations of the static
889 // stubs are at least cleared, subsequent class redefinition operations
890 // will access potentially free memory, and JavaThread execution
891 // concurrent to class unloading may call c2i adapters with dead methods.
892 if (!is_in_static_stub) {
893 // The first metadata relocation after a static stub relocation is the
894 // metadata relocation of the static stub used to pass the Method* to
895 // c2i adapters.
896 continue;
897 }
898 is_in_static_stub = false;
899 if (is_unloading()) {
900 // If the nmethod itself is dying, then it may point at dead metadata.
901 // Nobody should follow that metadata; it is strictly unsafe.
902 continue;
903 }
904 metadata_Relocation* r = iter.metadata_reloc();
905 Metadata* md = r->metadata_value();
906 if (md != nullptr && md->is_method()) {
907 Method* method = static_cast<Method*>(md);
908 if (!method->method_holder()->is_loader_alive()) {
909 AtomicAccess::store(r->metadata_addr(), (Method*)nullptr);
910
911 if (!r->metadata_is_immediate()) {
912 r->fix_metadata_relocation();
913 }
914 }
915 }
916 break;
917 }
918
919 default:
920 break;
921 }
922 }
923 }
924
925 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
926 // Exception happened outside inline-cache check code => we are inside
927 // an active nmethod => use cpc to determine a return address
928 int exception_offset = int(pc - code_begin());
929 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
930 #ifdef ASSERT
931 if (cont_offset == 0) {
932 Thread* thread = Thread::current();
933 ResourceMark rm(thread);
934 CodeBlob* cb = CodeCache::find_blob(pc);
935 assert(cb != nullptr && cb == this, "");
936
937 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
938 stringStream ss;
939 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
940 print_on(&ss);
941 method()->print_codes_on(&ss);
942 print_code_on(&ss);
943 print_pcs_on(&ss);
944 tty->print("%s", ss.as_string()); // print all at once
945 }
946 #endif
947 if (cont_offset == 0) {
948 // Let the normal error handling report the exception
949 return nullptr;
950 }
951 if (cont_offset == exception_offset) {
952 #if INCLUDE_JVMCI
953 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
954 JavaThread *thread = JavaThread::current();
955 thread->set_jvmci_implicit_exception_pc(pc);
956 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
957 Deoptimization::Action_reinterpret));
958 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
959 #else
960 ShouldNotReachHere();
961 #endif
962 }
963 return code_begin() + cont_offset;
964 }
965
966 class HasEvolDependency : public MetadataClosure {
967 bool _has_evol_dependency;
968 public:
969 HasEvolDependency() : _has_evol_dependency(false) {}
970 void do_metadata(Metadata* md) {
971 if (md->is_method()) {
972 Method* method = (Method*)md;
973 if (method->is_old()) {
974 _has_evol_dependency = true;
975 }
976 }
977 }
978 bool has_evol_dependency() const { return _has_evol_dependency; }
979 };
980
981 bool nmethod::has_evol_metadata() {
982 // Check the metadata in relocIter and CompiledIC and also deoptimize
983 // any nmethod that has reference to old methods.
984 HasEvolDependency check_evol;
985 metadata_do(&check_evol);
986 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
987 ResourceMark rm;
988 log_debug(redefine, class, nmethod)
989 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
990 _method->method_holder()->external_name(),
991 _method->name()->as_C_string(),
992 _method->signature()->as_C_string(),
993 compile_id());
994 }
995 return check_evol.has_evol_dependency();
996 }
997
998 int nmethod::total_size() const {
999 return
1000 consts_size() +
1001 insts_size() +
1002 stub_size() +
1003 scopes_data_size() +
1004 scopes_pcs_size() +
1005 handler_table_size() +
1006 nul_chk_table_size();
1007 }
1008
1009 const char* nmethod::compile_kind() const {
1010 if (is_osr_method()) return "osr";
1011 if (method() != nullptr && is_native_method()) {
1012 if (method()->is_continuation_native_intrinsic()) {
1013 return "cnt";
1014 }
1015 return "c2n";
1016 }
1017 return nullptr;
1018 }
1019
1020 const char* nmethod::compiler_name() const {
1021 return compilertype2name(_compiler_type);
1022 }
1023
1024 #ifdef ASSERT
1025 class CheckForOopsClosure : public OopClosure {
1026 bool _found_oop = false;
1027 public:
1028 virtual void do_oop(oop* o) { _found_oop = true; }
1029 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1030 bool found_oop() { return _found_oop; }
1031 };
1032 class CheckForMetadataClosure : public MetadataClosure {
1033 bool _found_metadata = false;
1034 Metadata* _ignore = nullptr;
1035 public:
1036 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1037 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1038 bool found_metadata() { return _found_metadata; }
1039 };
1040
1041 static void assert_no_oops_or_metadata(nmethod* nm) {
1042 if (nm == nullptr) return;
1043 assert(nm->oop_maps() == nullptr, "expectation");
1044
1045 CheckForOopsClosure cfo;
1046 nm->oops_do(&cfo);
1047 assert(!cfo.found_oop(), "no oops allowed");
1048
1049 // We allow an exception for the own Method, but require its class to be permanent.
1050 Method* own_method = nm->method();
1051 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1052 nm->metadata_do(&cfm);
1053 assert(!cfm.found_metadata(), "no metadata allowed");
1054
1055 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1056 "Method's class needs to be permanent");
1057 }
1058 #endif
1059
1060 static int required_mutable_data_size(CodeBuffer* code_buffer,
1061 int jvmci_data_size = 0) {
1062 return align_up(code_buffer->total_relocation_size(), oopSize) +
1063 align_up(code_buffer->total_metadata_size(), oopSize) +
1064 align_up(jvmci_data_size, oopSize);
1065 }
1066
1067 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1068 int compile_id,
1069 CodeBuffer *code_buffer,
1070 int vep_offset,
1071 int frame_complete,
1072 int frame_size,
1073 ByteSize basic_lock_owner_sp_offset,
1074 ByteSize basic_lock_sp_offset,
1075 OopMapSet* oop_maps,
1076 int exception_handler) {
1077 code_buffer->finalize_oop_references(method);
1078 // create nmethod
1079 nmethod* nm = nullptr;
1080 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1081 {
1082 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1083
1084 CodeOffsets offsets;
1085 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1086 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1087 if (exception_handler != -1) {
1088 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1089 }
1090
1091 int mutable_data_size = required_mutable_data_size(code_buffer);
1092
1093 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1094 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1095 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1096 nm = new (native_nmethod_size, allow_NonNMethod_space)
1097 nmethod(method(), compiler_none, native_nmethod_size,
1098 compile_id, &offsets,
1099 code_buffer, frame_size,
1100 basic_lock_owner_sp_offset,
1101 basic_lock_sp_offset,
1102 oop_maps, mutable_data_size);
1103 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1104 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1105 }
1106
1107 if (nm != nullptr) {
1108 // verify nmethod
1109 DEBUG_ONLY(nm->verify();) // might block
1110
1111 nm->log_new_nmethod();
1112 }
1113 return nm;
1114 }
1115
1116 nmethod* nmethod::new_nmethod(const methodHandle& method,
1117 int compile_id,
1118 int entry_bci,
1119 CodeOffsets* offsets,
1120 int orig_pc_offset,
1121 DebugInformationRecorder* debug_info,
1122 Dependencies* dependencies,
1123 CodeBuffer* code_buffer, int frame_size,
1124 OopMapSet* oop_maps,
1125 ExceptionHandlerTable* handler_table,
1126 ImplicitExceptionTable* nul_chk_table,
1127 AbstractCompiler* compiler,
1128 CompLevel comp_level
1129 #if INCLUDE_JVMCI
1130 , char* speculations,
1131 int speculations_len,
1132 JVMCINMethodData* jvmci_data
1133 #endif
1134 )
1135 {
1136 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1137 code_buffer->finalize_oop_references(method);
1138 // create nmethod
1139 nmethod* nm = nullptr;
1140 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1141
1142 int immutable_data_size =
1143 adjust_pcs_size(debug_info->pcs_size())
1144 + align_up((int)dependencies->size_in_bytes(), oopSize)
1145 + align_up(handler_table->size_in_bytes() , oopSize)
1146 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1147 #if INCLUDE_JVMCI
1148 + align_up(speculations_len , oopSize)
1149 #endif
1150 + align_up(debug_info->data_size() , oopSize);
1151
1152 // First, allocate space for immutable data in C heap.
1153 address immutable_data = nullptr;
1154 if (immutable_data_size > 0) {
1155 immutable_data_size += ImmutableDataRefCountSize;
1156 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1157 if (immutable_data == nullptr) {
1158 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1159 return nullptr;
1160 }
1161 }
1162
1163 int mutable_data_size = required_mutable_data_size(code_buffer
1164 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1165
1166 {
1167 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1168
1169 nm = new (nmethod_size, comp_level)
1170 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1171 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1172 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1173 handler_table, nul_chk_table, compiler, comp_level
1174 #if INCLUDE_JVMCI
1175 , speculations,
1176 speculations_len,
1177 jvmci_data
1178 #endif
1179 );
1180
1181 if (nm != nullptr) {
1182 // To make dependency checking during class loading fast, record
1183 // the nmethod dependencies in the classes it is dependent on.
1184 // This allows the dependency checking code to simply walk the
1185 // class hierarchy above the loaded class, checking only nmethods
1186 // which are dependent on those classes. The slow way is to
1187 // check every nmethod for dependencies which makes it linear in
1188 // the number of methods compiled. For applications with a lot
1189 // classes the slow way is too slow.
1190 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1191 if (deps.type() == Dependencies::call_site_target_value) {
1192 // CallSite dependencies are managed on per-CallSite instance basis.
1193 oop call_site = deps.argument_oop(0);
1194 MethodHandles::add_dependent_nmethod(call_site, nm);
1195 } else {
1196 InstanceKlass* ik = deps.context_type();
1197 if (ik == nullptr) {
1198 continue; // ignore things like evol_method
1199 }
1200 // record this nmethod as dependent on this klass
1201 ik->add_dependent_nmethod(nm);
1202 }
1203 }
1204 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm));
1205 }
1206 }
1207 // Do verification and logging outside CodeCache_lock.
1208 if (nm != nullptr) {
1209 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1210 DEBUG_ONLY(nm->verify();)
1211 nm->log_new_nmethod();
1212 }
1213 return nm;
1214 }
1215
1216 // Fill in default values for various fields
1217 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1218 // avoid uninitialized fields, even for short time periods
1219 _exception_cache = nullptr;
1220 _gc_data = nullptr;
1221 _oops_do_mark_link = nullptr;
1222 _compiled_ic_data = nullptr;
1223
1224 _is_unloading_state = 0;
1225 _state = not_installed;
1226
1227 _has_unsafe_access = 0;
1228 _has_wide_vectors = 0;
1229 _has_monitors = 0;
1230 _has_scoped_access = 0;
1231 _has_flushed_dependencies = 0;
1232 _is_unlinked = 0;
1233 _load_reported = 0; // jvmti state
1234
1235 _deoptimization_status = not_marked;
1236
1237 // SECT_CONSTS is first in code buffer so the offset should be 0.
1238 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1239 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1240
1241 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1242
1243 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1244 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1245
1246 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1247 }
1248
1249 // Post initialization
1250 void nmethod::post_init() {
1251 clear_unloading_state();
1252
1253 finalize_relocations();
1254
1255 Universe::heap()->register_nmethod(this);
1256 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1257
1258 CodeCache::commit(this);
1259 }
1260
1261 // For native wrappers
1262 nmethod::nmethod(
1263 Method* method,
1264 CompilerType type,
1265 int nmethod_size,
1266 int compile_id,
1267 CodeOffsets* offsets,
1268 CodeBuffer* code_buffer,
1269 int frame_size,
1270 ByteSize basic_lock_owner_sp_offset,
1271 ByteSize basic_lock_sp_offset,
1272 OopMapSet* oop_maps,
1273 int mutable_data_size)
1274 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1275 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1276 _deoptimization_generation(0),
1277 _gc_epoch(CodeCache::gc_epoch()),
1278 _method(method),
1279 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1280 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1281 {
1282 {
1283 DEBUG_ONLY(NoSafepointVerifier nsv;)
1284 assert_locked_or_safepoint(CodeCache_lock);
1285
1286 init_defaults(code_buffer, offsets);
1287
1288 _osr_entry_point = nullptr;
1289 _pc_desc_container = nullptr;
1290 _entry_bci = InvocationEntryBci;
1291 _compile_id = compile_id;
1292 _comp_level = CompLevel_none;
1293 _compiler_type = type;
1294 _orig_pc_offset = 0;
1295 _num_stack_arg_slots = 0;
1296
1297 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1298 // Continuation enter intrinsic
1299 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1300 } else {
1301 _exception_offset = 0;
1302 }
1303 // Native wrappers do not have deopt handlers. Make the values
1304 // something that will never match a pc like the nmethod vtable entry
1305 _deopt_handler_entry_offset = 0;
1306 _unwind_handler_offset = 0;
1307
1308 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1309 uint16_t metadata_size;
1310 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1311 JVMCI_ONLY( _metadata_size = metadata_size; )
1312 assert(_mutable_data_size == _relocation_size + metadata_size,
1313 "wrong mutable data size: %d != %d + %d",
1314 _mutable_data_size, _relocation_size, metadata_size);
1315
1316 // native wrapper does not have read-only data but we need unique not null address
1317 _immutable_data = blob_end();
1318 _immutable_data_size = 0;
1319 _nul_chk_table_offset = 0;
1320 _handler_table_offset = 0;
1321 _scopes_pcs_offset = 0;
1322 _scopes_data_offset = 0;
1323 #if INCLUDE_JVMCI
1324 _speculations_offset = 0;
1325 #endif
1326 _immutable_data_ref_count_offset = 0;
1327
1328 code_buffer->copy_code_and_locs_to(this);
1329 code_buffer->copy_values_to(this);
1330
1331 post_init();
1332 }
1333
1334 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1335 ttyLocker ttyl; // keep the following output all in one block
1336 // This output goes directly to the tty, not the compiler log.
1337 // To enable tools to match it up with the compilation activity,
1338 // be sure to tag this tty output with the compile ID.
1339 if (xtty != nullptr) {
1340 xtty->begin_head("print_native_nmethod");
1341 xtty->method(_method);
1342 xtty->stamp();
1343 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1344 }
1345 // Print the header part, then print the requested information.
1346 // This is both handled in decode2(), called via print_code() -> decode()
1347 if (PrintNativeNMethods) {
1348 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1349 print_code();
1350 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1351 #if defined(SUPPORT_DATA_STRUCTS)
1352 if (AbstractDisassembler::show_structs()) {
1353 if (oop_maps != nullptr) {
1354 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1355 oop_maps->print_on(tty);
1356 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1357 }
1358 }
1359 #endif
1360 } else {
1361 print(); // print the header part only.
1362 }
1363 #if defined(SUPPORT_DATA_STRUCTS)
1364 if (AbstractDisassembler::show_structs()) {
1365 if (PrintRelocations) {
1366 print_relocations();
1367 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1368 }
1369 }
1370 #endif
1371 if (xtty != nullptr) {
1372 xtty->tail("print_native_nmethod");
1373 }
1374 }
1375 }
1376
1377
1378 nmethod::nmethod(const nmethod &nm) : CodeBlob(nm._name, nm._kind, nm._size, nm._header_size)
1379 {
1380
1381 if (nm._oop_maps != nullptr) {
1382 _oop_maps = nm._oop_maps->clone();
1383 } else {
1384 _oop_maps = nullptr;
1385 }
1386
1387 _size = nm._size;
1388 _relocation_size = nm._relocation_size;
1389 _content_offset = nm._content_offset;
1390 _code_offset = nm._code_offset;
1391 _data_offset = nm._data_offset;
1392 _frame_size = nm._frame_size;
1393
1394 S390_ONLY( _ctable_offset = nm._ctable_offset; )
1395
1396 _header_size = nm._header_size;
1397 _frame_complete_offset = nm._frame_complete_offset;
1398
1399 _kind = nm._kind;
1400
1401 _caller_must_gc_arguments = nm._caller_must_gc_arguments;
1402
1403 #ifndef PRODUCT
1404 _asm_remarks.share(nm._asm_remarks);
1405 _dbg_strings.share(nm._dbg_strings);
1406 #endif
1407
1408 // Allocate memory and copy mutable data to C heap
1409 _mutable_data_size = nm._mutable_data_size;
1410 if (_mutable_data_size > 0) {
1411 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
1412 if (_mutable_data == nullptr) {
1413 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for mutable data");
1414 }
1415 memcpy(mutable_data_begin(), nm.mutable_data_begin(), nm.mutable_data_size());
1416 } else {
1417 _mutable_data = nullptr;
1418 }
1419
1420 _deoptimization_generation = 0;
1421 _gc_epoch = CodeCache::gc_epoch();
1422 _method = nm._method;
1423 _osr_link = nullptr;
1424
1425 _exception_cache = nullptr;
1426 _gc_data = nullptr;
1427 _oops_do_mark_nmethods = nullptr;
1428 _oops_do_mark_link = nullptr;
1429 _compiled_ic_data = nullptr;
1430
1431 if (nm._osr_entry_point != nullptr) {
1432 _osr_entry_point = (nm._osr_entry_point - (address) &nm) + (address) this;
1433 } else {
1434 _osr_entry_point = nullptr;
1435 }
1436
1437 _entry_offset = nm._entry_offset;
1438 _verified_entry_offset = nm._verified_entry_offset;
1439 _entry_bci = nm._entry_bci;
1440 _immutable_data_size = nm._immutable_data_size;
1441
1442 _skipped_instructions_size = nm._skipped_instructions_size;
1443 _stub_offset = nm._stub_offset;
1444 _exception_offset = nm._exception_offset;
1445 _deopt_handler_entry_offset = nm._deopt_handler_entry_offset;
1446 _unwind_handler_offset = nm._unwind_handler_offset;
1447 _num_stack_arg_slots = nm._num_stack_arg_slots;
1448 _oops_size = nm._oops_size;
1449 #if INCLUDE_JVMCI
1450 _metadata_size = nm._metadata_size;
1451 #endif
1452 _nul_chk_table_offset = nm._nul_chk_table_offset;
1453 _handler_table_offset = nm._handler_table_offset;
1454 _scopes_pcs_offset = nm._scopes_pcs_offset;
1455 _scopes_data_offset = nm._scopes_data_offset;
1456 #if INCLUDE_JVMCI
1457 _speculations_offset = nm._speculations_offset;
1458 #endif
1459 _immutable_data_ref_count_offset = nm._immutable_data_ref_count_offset;
1460
1461 // Increment number of references to immutable data to share it between nmethods
1462 if (_immutable_data_size > 0) {
1463 _immutable_data = nm._immutable_data;
1464 inc_immutable_data_ref_count();
1465 } else {
1466 _immutable_data = blob_end();
1467 }
1468
1469 _orig_pc_offset = nm._orig_pc_offset;
1470 _compile_id = nm._compile_id;
1471 _comp_level = nm._comp_level;
1472 _compiler_type = nm._compiler_type;
1473 _is_unloading_state = nm._is_unloading_state;
1474 _state = not_installed;
1475
1476 _has_unsafe_access = nm._has_unsafe_access;
1477 _has_wide_vectors = nm._has_wide_vectors;
1478 _has_monitors = nm._has_monitors;
1479 _has_scoped_access = nm._has_scoped_access;
1480 _has_flushed_dependencies = nm._has_flushed_dependencies;
1481 _is_unlinked = nm._is_unlinked;
1482 _load_reported = nm._load_reported;
1483
1484 _deoptimization_status = nm._deoptimization_status;
1485
1486 if (nm._pc_desc_container != nullptr) {
1487 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1488 } else {
1489 _pc_desc_container = nullptr;
1490 }
1491
1492 // Copy nmethod contents excluding header
1493 // - Constant part (doubles, longs and floats used in nmethod)
1494 // - Code part:
1495 // - Code body
1496 // - Exception handler
1497 // - Stub code
1498 // - OOP table
1499 memcpy(consts_begin(), nm.consts_begin(), nm.data_end() - nm.consts_begin());
1500
1501 post_init();
1502 }
1503
1504 nmethod* nmethod::relocate(CodeBlobType code_blob_type) {
1505 assert(NMethodRelocation, "must enable use of function");
1506
1507 // Locks required to be held by caller to ensure the nmethod
1508 // is not modified or purged from code cache during relocation
1509 assert_lock_strong(CodeCache_lock);
1510 assert_lock_strong(Compile_lock);
1511 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1512
1513 if (!is_relocatable()) {
1514 return nullptr;
1515 }
1516
1517 run_nmethod_entry_barrier();
1518 nmethod* nm_copy = new (size(), code_blob_type) nmethod(*this);
1519
1520 if (nm_copy == nullptr) {
1521 return nullptr;
1522 }
1523
1524 // Fix relocation
1525 RelocIterator iter(nm_copy);
1526 CodeBuffer src(this);
1527 CodeBuffer dst(nm_copy);
1528 while (iter.next()) {
1529 #ifdef USE_TRAMPOLINE_STUB_FIX_OWNER
1530 // Direct calls may no longer be in range and the use of a trampoline may now be required.
1531 // Instead, allow trampoline relocations to update their owners and perform the necessary checks.
1532 if (iter.reloc()->is_call()) {
1533 address trampoline = trampoline_stub_Relocation::get_trampoline_for(iter.reloc()->addr(), nm_copy);
1534 if (trampoline != nullptr) {
1535 continue;
1536 }
1537 }
1538 #endif
1539
1540 iter.reloc()->fix_relocation_after_move(&src, &dst);
1541 }
1542
1543 // To make dependency checking during class loading fast, record
1544 // the nmethod dependencies in the classes it is dependent on.
1545 // This allows the dependency checking code to simply walk the
1546 // class hierarchy above the loaded class, checking only nmethods
1547 // which are dependent on those classes. The slow way is to
1548 // check every nmethod for dependencies which makes it linear in
1549 // the number of methods compiled. For applications with a lot
1550 // classes the slow way is too slow.
1551 for (Dependencies::DepStream deps(nm_copy); deps.next(); ) {
1552 if (deps.type() == Dependencies::call_site_target_value) {
1553 // CallSite dependencies are managed on per-CallSite instance basis.
1554 oop call_site = deps.argument_oop(0);
1555 MethodHandles::add_dependent_nmethod(call_site, nm_copy);
1556 } else {
1557 InstanceKlass* ik = deps.context_type();
1558 if (ik == nullptr) {
1559 continue; // ignore things like evol_method
1560 }
1561 // record this nmethod as dependent on this klass
1562 ik->add_dependent_nmethod(nm_copy);
1563 }
1564 }
1565
1566 MutexLocker ml_NMethodState_lock(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1567
1568 // Verify the nm we copied from is still valid
1569 if (!is_marked_for_deoptimization() && is_in_use()) {
1570 assert(method() != nullptr && method()->code() == this, "should be if is in use");
1571
1572 nm_copy->clear_inline_caches();
1573
1574 // Attempt to start using the copy
1575 if (nm_copy->make_in_use()) {
1576 ICache::invalidate_range(nm_copy->code_begin(), nm_copy->code_size());
1577
1578 methodHandle mh(Thread::current(), nm_copy->method());
1579 nm_copy->method()->set_code(mh, nm_copy);
1580
1581 make_not_used();
1582
1583 nm_copy->post_compiled_method_load_event();
1584
1585 nm_copy->log_relocated_nmethod(this);
1586
1587 return nm_copy;
1588 }
1589 }
1590
1591 nm_copy->make_not_used();
1592
1593 return nullptr;
1594 }
1595
1596 bool nmethod::is_relocatable() {
1597 if (!is_java_method()) {
1598 return false;
1599 }
1600
1601 if (!is_in_use()) {
1602 return false;
1603 }
1604
1605 if (is_osr_method()) {
1606 return false;
1607 }
1608
1609 if (is_marked_for_deoptimization()) {
1610 return false;
1611 }
1612
1613 #if INCLUDE_JVMCI
1614 if (jvmci_nmethod_data() != nullptr && jvmci_nmethod_data()->has_mirror()) {
1615 return false;
1616 }
1617 #endif
1618
1619 if (is_unloading()) {
1620 return false;
1621 }
1622
1623 if (has_evol_metadata()) {
1624 return false;
1625 }
1626
1627 return true;
1628 }
1629
1630 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1631 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1632 }
1633
1634 void* nmethod::operator new(size_t size, int nmethod_size, CodeBlobType code_blob_type) throw () {
1635 return CodeCache::allocate(nmethod_size, code_blob_type);
1636 }
1637
1638 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1639 // Try MethodNonProfiled and MethodProfiled.
1640 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1641 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1642 // Try NonNMethod or give up.
1643 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1644 }
1645
1646 // For normal JIT compiled code
1647 nmethod::nmethod(
1648 Method* method,
1649 CompilerType type,
1650 int nmethod_size,
1651 int immutable_data_size,
1652 int mutable_data_size,
1653 int compile_id,
1654 int entry_bci,
1655 address immutable_data,
1656 CodeOffsets* offsets,
1657 int orig_pc_offset,
1658 DebugInformationRecorder* debug_info,
1659 Dependencies* dependencies,
1660 CodeBuffer *code_buffer,
1661 int frame_size,
1662 OopMapSet* oop_maps,
1663 ExceptionHandlerTable* handler_table,
1664 ImplicitExceptionTable* nul_chk_table,
1665 AbstractCompiler* compiler,
1666 CompLevel comp_level
1667 #if INCLUDE_JVMCI
1668 , char* speculations,
1669 int speculations_len,
1670 JVMCINMethodData* jvmci_data
1671 #endif
1672 )
1673 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1674 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1675 _deoptimization_generation(0),
1676 _gc_epoch(CodeCache::gc_epoch()),
1677 _method(method),
1678 _osr_link(nullptr)
1679 {
1680 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1681 {
1682 DEBUG_ONLY(NoSafepointVerifier nsv;)
1683 assert_locked_or_safepoint(CodeCache_lock);
1684
1685 init_defaults(code_buffer, offsets);
1686
1687 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1688 _entry_bci = entry_bci;
1689 _compile_id = compile_id;
1690 _comp_level = comp_level;
1691 _compiler_type = type;
1692 _orig_pc_offset = orig_pc_offset;
1693
1694 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1695
1696 set_ctable_begin(header_begin() + content_offset());
1697
1698 #if INCLUDE_JVMCI
1699 if (compiler->is_jvmci()) {
1700 // JVMCI might not produce any stub sections
1701 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1702 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1703 } else {
1704 _exception_offset = -1;
1705 }
1706 if (offsets->value(CodeOffsets::Deopt) != -1) {
1707 _deopt_handler_entry_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1708 } else {
1709 _deopt_handler_entry_offset = -1;
1710 }
1711 } else
1712 #endif
1713 {
1714 // Exception handler and deopt handler are in the stub section
1715 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1716
1717 bool has_exception_handler = (offsets->value(CodeOffsets::Exceptions) != -1);
1718 assert(has_exception_handler == (compiler->type() != compiler_c2),
1719 "C2 compiler doesn't provide exception handler stub code.");
1720 if (has_exception_handler) {
1721 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1722 } else {
1723 _exception_offset = -1;
1724 }
1725
1726 _deopt_handler_entry_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1727 }
1728 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1729 // C1 generates UnwindHandler at the end of instructions section.
1730 // Calculate positive offset as distance between the start of stubs section
1731 // (which is also the end of instructions section) and the start of the handler.
1732 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1733 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1734 } else {
1735 _unwind_handler_offset = -1;
1736 }
1737
1738 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1739 uint16_t metadata_size;
1740 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1741 JVMCI_ONLY( _metadata_size = metadata_size; )
1742 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1743 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1744 "wrong mutable data size: %d != %d + %d + %d",
1745 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1746 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1747 nmethod_size, (int)(code_end() - header_begin()));
1748
1749 _immutable_data_size = immutable_data_size;
1750 if (immutable_data_size > 0) {
1751 assert(immutable_data != nullptr, "required");
1752 _immutable_data = immutable_data;
1753 } else {
1754 // We need unique not null address
1755 _immutable_data = blob_end();
1756 }
1757 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1758 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1759 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1760 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1761
1762 #if INCLUDE_JVMCI
1763 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1764 _immutable_data_ref_count_offset = _speculations_offset + align_up(speculations_len, oopSize);
1765 #else
1766 _immutable_data_ref_count_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1767 #endif
1768 DEBUG_ONLY( int immutable_data_end_offset = _immutable_data_ref_count_offset + ImmutableDataRefCountSize; )
1769 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1770 immutable_data_end_offset, immutable_data_size);
1771
1772 // Copy code and relocation info
1773 code_buffer->copy_code_and_locs_to(this);
1774 // Copy oops and metadata
1775 code_buffer->copy_values_to(this);
1776 dependencies->copy_to(this);
1777 // Copy PcDesc and ScopeDesc data
1778 debug_info->copy_to(this);
1779
1780 // Create cache after PcDesc data is copied - it will be used to initialize cache
1781 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1782
1783 #if INCLUDE_JVMCI
1784 if (compiler->is_jvmci()) {
1785 // Initialize the JVMCINMethodData object inlined into nm
1786 jvmci_nmethod_data()->copy(jvmci_data);
1787 }
1788 #endif
1789
1790 // Copy contents of ExceptionHandlerTable to nmethod
1791 handler_table->copy_to(this);
1792 nul_chk_table->copy_to(this);
1793
1794 #if INCLUDE_JVMCI
1795 // Copy speculations to nmethod
1796 if (speculations_size() != 0) {
1797 memcpy(speculations_begin(), speculations, speculations_len);
1798 }
1799 #endif
1800 init_immutable_data_ref_count();
1801
1802 post_init();
1803
1804 // we use the information of entry points to find out if a method is
1805 // static or non static
1806 assert(compiler->is_c2() || compiler->is_jvmci() ||
1807 _method->is_static() == (entry_point() == verified_entry_point()),
1808 " entry points must be same for static methods and vice versa");
1809 }
1810 }
1811
1812 // Print a short set of xml attributes to identify this nmethod. The
1813 // output should be embedded in some other element.
1814 void nmethod::log_identity(xmlStream* log) const {
1815 log->print(" compile_id='%d'", compile_id());
1816 const char* nm_kind = compile_kind();
1817 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1818 log->print(" compiler='%s'", compiler_name());
1819 if (TieredCompilation) {
1820 log->print(" level='%d'", comp_level());
1821 }
1822 #if INCLUDE_JVMCI
1823 if (jvmci_nmethod_data() != nullptr) {
1824 const char* jvmci_name = jvmci_nmethod_data()->name();
1825 if (jvmci_name != nullptr) {
1826 log->print(" jvmci_mirror_name='");
1827 log->text("%s", jvmci_name);
1828 log->print("'");
1829 }
1830 }
1831 #endif
1832 }
1833
1834
1835 #define LOG_OFFSET(log, name) \
1836 if (p2i(name##_end()) - p2i(name##_begin())) \
1837 log->print(" " XSTR(name) "_offset='%zd'" , \
1838 p2i(name##_begin()) - p2i(this))
1839
1840
1841 void nmethod::log_new_nmethod() const {
1842 if (LogCompilation && xtty != nullptr) {
1843 ttyLocker ttyl;
1844 xtty->begin_elem("nmethod");
1845 log_identity(xtty);
1846 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1847 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1848
1849 LOG_OFFSET(xtty, relocation);
1850 LOG_OFFSET(xtty, consts);
1851 LOG_OFFSET(xtty, insts);
1852 LOG_OFFSET(xtty, stub);
1853 LOG_OFFSET(xtty, scopes_data);
1854 LOG_OFFSET(xtty, scopes_pcs);
1855 LOG_OFFSET(xtty, dependencies);
1856 LOG_OFFSET(xtty, handler_table);
1857 LOG_OFFSET(xtty, nul_chk_table);
1858 LOG_OFFSET(xtty, oops);
1859 LOG_OFFSET(xtty, metadata);
1860
1861 xtty->method(method());
1862 xtty->stamp();
1863 xtty->end_elem();
1864 }
1865 }
1866
1867
1868 void nmethod::log_relocated_nmethod(nmethod* original) const {
1869 if (LogCompilation && xtty != nullptr) {
1870 ttyLocker ttyl;
1871 xtty->begin_elem("relocated nmethod");
1872 log_identity(xtty);
1873 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1874
1875 const char* original_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(original));
1876 xtty->print(" original_address='" INTPTR_FORMAT "'", p2i(original));
1877 xtty->print(" original_code_heap='%s'", original_code_heap_name);
1878
1879 const char* new_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(this));
1880 xtty->print(" new_address='" INTPTR_FORMAT "'", p2i(this));
1881 xtty->print(" new_code_heap='%s'", new_code_heap_name);
1882
1883 LOG_OFFSET(xtty, relocation);
1884 LOG_OFFSET(xtty, consts);
1885 LOG_OFFSET(xtty, insts);
1886 LOG_OFFSET(xtty, stub);
1887 LOG_OFFSET(xtty, scopes_data);
1888 LOG_OFFSET(xtty, scopes_pcs);
1889 LOG_OFFSET(xtty, dependencies);
1890 LOG_OFFSET(xtty, handler_table);
1891 LOG_OFFSET(xtty, nul_chk_table);
1892 LOG_OFFSET(xtty, oops);
1893 LOG_OFFSET(xtty, metadata);
1894
1895 xtty->method(method());
1896 xtty->stamp();
1897 xtty->end_elem();
1898 }
1899 }
1900
1901 #undef LOG_OFFSET
1902
1903
1904 // Print out more verbose output usually for a newly created nmethod.
1905 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1906 if (st != nullptr) {
1907 ttyLocker ttyl;
1908 if (WizardMode) {
1909 CompileTask::print(st, this, msg, /*short_form:*/ true);
1910 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1911 } else {
1912 CompileTask::print(st, this, msg, /*short_form:*/ false);
1913 }
1914 }
1915 }
1916
1917 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1918 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1919 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1920 print_nmethod(printnmethods);
1921 }
1922 }
1923
1924 void nmethod::print_nmethod(bool printmethod) {
1925 ttyLocker ttyl; // keep the following output all in one block
1926 if (xtty != nullptr) {
1927 xtty->begin_head("print_nmethod");
1928 log_identity(xtty);
1929 xtty->stamp();
1930 xtty->end_head();
1931 }
1932 // Print the header part, then print the requested information.
1933 // This is both handled in decode2().
1934 if (printmethod) {
1935 ResourceMark m;
1936 if (is_compiled_by_c1()) {
1937 tty->cr();
1938 tty->print_cr("============================= C1-compiled nmethod ==============================");
1939 }
1940 if (is_compiled_by_jvmci()) {
1941 tty->cr();
1942 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1943 }
1944 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1945 decode2(tty);
1946 #if defined(SUPPORT_DATA_STRUCTS)
1947 if (AbstractDisassembler::show_structs()) {
1948 // Print the oops from the underlying CodeBlob as well.
1949 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1950 print_oops(tty);
1951 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1952 print_metadata(tty);
1953 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1954 print_pcs_on(tty);
1955 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1956 if (oop_maps() != nullptr) {
1957 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1958 oop_maps()->print_on(tty);
1959 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1960 }
1961 }
1962 #endif
1963 } else {
1964 print(); // print the header part only.
1965 }
1966
1967 #if defined(SUPPORT_DATA_STRUCTS)
1968 if (AbstractDisassembler::show_structs()) {
1969 methodHandle mh(Thread::current(), _method);
1970 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1971 print_scopes();
1972 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1973 }
1974 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1975 print_relocations();
1976 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1977 }
1978 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1979 print_dependencies_on(tty);
1980 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1981 }
1982 if (printmethod || PrintExceptionHandlers) {
1983 print_handler_table();
1984 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1985 print_nul_chk_table();
1986 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1987 }
1988
1989 if (printmethod) {
1990 print_recorded_oops();
1991 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1992 print_recorded_metadata();
1993 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1994 }
1995 }
1996 #endif
1997
1998 if (xtty != nullptr) {
1999 xtty->tail("print_nmethod");
2000 }
2001 }
2002
2003
2004 // Promote one word from an assembly-time handle to a live embedded oop.
2005 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
2006 if (handle == nullptr ||
2007 // As a special case, IC oops are initialized to 1 or -1.
2008 handle == (jobject) Universe::non_oop_word()) {
2009 *(void**)dest = handle;
2010 } else {
2011 *dest = JNIHandles::resolve_non_null(handle);
2012 }
2013 }
2014
2015
2016 // Have to have the same name because it's called by a template
2017 void nmethod::copy_values(GrowableArray<jobject>* array) {
2018 int length = array->length();
2019 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
2020 oop* dest = oops_begin();
2021 for (int index = 0 ; index < length; index++) {
2022 initialize_immediate_oop(&dest[index], array->at(index));
2023 }
2024
2025 // Now we can fix up all the oops in the code. We need to do this
2026 // in the code because the assembler uses jobjects as placeholders.
2027 // The code and relocations have already been initialized by the
2028 // CodeBlob constructor, so it is valid even at this early point to
2029 // iterate over relocations and patch the code.
2030 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
2031 }
2032
2033 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
2034 int length = array->length();
2035 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
2036 Metadata** dest = metadata_begin();
2037 for (int index = 0 ; index < length; index++) {
2038 dest[index] = array->at(index);
2039 }
2040 }
2041
2042 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
2043 // re-patch all oop-bearing instructions, just in case some oops moved
2044 RelocIterator iter(this, begin, end);
2045 while (iter.next()) {
2046 if (iter.type() == relocInfo::oop_type) {
2047 oop_Relocation* reloc = iter.oop_reloc();
2048 if (initialize_immediates && reloc->oop_is_immediate()) {
2049 oop* dest = reloc->oop_addr();
2050 jobject obj = *reinterpret_cast<jobject*>(dest);
2051 initialize_immediate_oop(dest, obj);
2052 }
2053 // Refresh the oop-related bits of this instruction.
2054 reloc->fix_oop_relocation();
2055 } else if (iter.type() == relocInfo::metadata_type) {
2056 metadata_Relocation* reloc = iter.metadata_reloc();
2057 reloc->fix_metadata_relocation();
2058 }
2059 }
2060 }
2061
2062 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
2063 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
2064 intptr_t cbaddr = (intptr_t) nm;
2065 intptr_t offset = ((intptr_t) pc) - cbaddr;
2066
2067 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
2068 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
2069 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
2070 } else if (!nop->patch(oopmap_slot, offset)) {
2071 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
2072 }
2073 }
2074
2075 void nmethod::finalize_relocations() {
2076 NoSafepointVerifier nsv;
2077
2078 GrowableArray<NativeMovConstReg*> virtual_call_data;
2079
2080 // Make sure that post call nops fill in nmethod offsets eagerly so
2081 // we don't have to race with deoptimization
2082 RelocIterator iter(this);
2083 while (iter.next()) {
2084 if (iter.type() == relocInfo::virtual_call_type) {
2085 virtual_call_Relocation* r = iter.virtual_call_reloc();
2086 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
2087 virtual_call_data.append(value);
2088 } else if (iter.type() == relocInfo::post_call_nop_type) {
2089 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
2090 address pc = reloc->addr();
2091 install_post_call_nop_displacement(this, pc);
2092 }
2093 }
2094
2095 if (virtual_call_data.length() > 0) {
2096 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
2097 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
2098 CompiledICData* next_data = _compiled_ic_data;
2099
2100 for (NativeMovConstReg* value : virtual_call_data) {
2101 value->set_data((intptr_t)next_data);
2102 next_data++;
2103 }
2104 }
2105 }
2106
2107 void nmethod::make_deoptimized() {
2108 if (!Continuations::enabled()) {
2109 // Don't deopt this again.
2110 set_deoptimized_done();
2111 return;
2112 }
2113
2114 assert(method() == nullptr || can_be_deoptimized(), "");
2115
2116 CompiledICLocker ml(this);
2117 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2118
2119 // If post call nops have been already patched, we can just bail-out.
2120 if (has_been_deoptimized()) {
2121 return;
2122 }
2123
2124 ResourceMark rm;
2125 RelocIterator iter(this, oops_reloc_begin());
2126
2127 while (iter.next()) {
2128
2129 switch (iter.type()) {
2130 case relocInfo::virtual_call_type: {
2131 CompiledIC *ic = CompiledIC_at(&iter);
2132 address pc = ic->end_of_call();
2133 NativePostCallNop* nop = nativePostCallNop_at(pc);
2134 if (nop != nullptr) {
2135 nop->make_deopt();
2136 }
2137 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2138 break;
2139 }
2140 case relocInfo::static_call_type:
2141 case relocInfo::opt_virtual_call_type: {
2142 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2143 address pc = csc->end_of_call();
2144 NativePostCallNop* nop = nativePostCallNop_at(pc);
2145 //tty->print_cr(" - static pc %p", pc);
2146 if (nop != nullptr) {
2147 nop->make_deopt();
2148 }
2149 // We can't assert here, there are some calls to stubs / runtime
2150 // that have reloc data and doesn't have a post call NOP.
2151 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2152 break;
2153 }
2154 default:
2155 break;
2156 }
2157 }
2158 // Don't deopt this again.
2159 set_deoptimized_done();
2160 }
2161
2162 void nmethod::verify_clean_inline_caches() {
2163 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2164
2165 ResourceMark rm;
2166 RelocIterator iter(this, oops_reloc_begin());
2167 while(iter.next()) {
2168 switch(iter.type()) {
2169 case relocInfo::virtual_call_type: {
2170 CompiledIC *ic = CompiledIC_at(&iter);
2171 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2172 assert(cb != nullptr, "destination not in CodeBlob?");
2173 nmethod* nm = cb->as_nmethod_or_null();
2174 if (nm != nullptr) {
2175 // Verify that inline caches pointing to bad nmethods are clean
2176 if (!nm->is_in_use() || nm->is_unloading()) {
2177 assert(ic->is_clean(), "IC should be clean");
2178 }
2179 }
2180 break;
2181 }
2182 case relocInfo::static_call_type:
2183 case relocInfo::opt_virtual_call_type: {
2184 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2185 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2186 assert(cb != nullptr, "destination not in CodeBlob?");
2187 nmethod* nm = cb->as_nmethod_or_null();
2188 if (nm != nullptr) {
2189 // Verify that inline caches pointing to bad nmethods are clean
2190 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2191 assert(cdc->is_clean(), "IC should be clean");
2192 }
2193 }
2194 break;
2195 }
2196 default:
2197 break;
2198 }
2199 }
2200 }
2201
2202 void nmethod::mark_as_maybe_on_stack() {
2203 AtomicAccess::store(&_gc_epoch, CodeCache::gc_epoch());
2204 }
2205
2206 bool nmethod::is_maybe_on_stack() {
2207 // If the condition below is true, it means that the nmethod was found to
2208 // be alive the previous completed marking cycle.
2209 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2210 }
2211
2212 void nmethod::inc_decompile_count() {
2213 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2214 // Could be gated by ProfileTraps, but do not bother...
2215 #if INCLUDE_JVMCI
2216 if (jvmci_skip_profile_deopt()) {
2217 return;
2218 }
2219 #endif
2220 Method* m = method();
2221 if (m == nullptr) return;
2222 MethodData* mdo = m->method_data();
2223 if (mdo == nullptr) return;
2224 // There is a benign race here. See comments in methodData.hpp.
2225 mdo->inc_decompile_count();
2226 }
2227
2228 bool nmethod::try_transition(signed char new_state_int) {
2229 signed char new_state = new_state_int;
2230 assert_lock_strong(NMethodState_lock);
2231 signed char old_state = _state;
2232 if (old_state >= new_state) {
2233 // Ensure monotonicity of transitions.
2234 return false;
2235 }
2236 AtomicAccess::store(&_state, new_state);
2237 return true;
2238 }
2239
2240 void nmethod::invalidate_osr_method() {
2241 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2242 // Remove from list of active nmethods
2243 if (method() != nullptr) {
2244 method()->method_holder()->remove_osr_nmethod(this);
2245 }
2246 }
2247
2248 void nmethod::log_state_change(InvalidationReason invalidation_reason) const {
2249 if (LogCompilation) {
2250 if (xtty != nullptr) {
2251 ttyLocker ttyl; // keep the following output all in one block
2252 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2253 os::current_thread_id(), invalidation_reason_to_string(invalidation_reason));
2254 log_identity(xtty);
2255 xtty->stamp();
2256 xtty->end_elem();
2257 }
2258 }
2259
2260 ResourceMark rm;
2261 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2262 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2263
2264 CompileTask::print_ul(this, ss.freeze());
2265 if (PrintCompilation) {
2266 print_on_with_msg(tty, ss.freeze());
2267 }
2268 }
2269
2270 void nmethod::unlink_from_method() {
2271 if (method() != nullptr) {
2272 method()->unlink_code(this);
2273 }
2274 }
2275
2276 // Invalidate code
2277 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason) {
2278 // This can be called while the system is already at a safepoint which is ok
2279 NoSafepointVerifier nsv;
2280
2281 if (is_unloading()) {
2282 // If the nmethod is unloading, then it is already not entrant through
2283 // the nmethod entry barriers. No need to do anything; GC will unload it.
2284 return false;
2285 }
2286
2287 if (AtomicAccess::load(&_state) == not_entrant) {
2288 // Avoid taking the lock if already in required state.
2289 // This is safe from races because the state is an end-state,
2290 // which the nmethod cannot back out of once entered.
2291 // No need for fencing either.
2292 return false;
2293 }
2294
2295 {
2296 // Enter critical section. Does not block for safepoint.
2297 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2298
2299 if (AtomicAccess::load(&_state) == not_entrant) {
2300 // another thread already performed this transition so nothing
2301 // to do, but return false to indicate this.
2302 return false;
2303 }
2304
2305 if (is_osr_method()) {
2306 // This logic is equivalent to the logic below for patching the
2307 // verified entry point of regular methods.
2308 // this effectively makes the osr nmethod not entrant
2309 invalidate_osr_method();
2310 } else {
2311 // The caller can be calling the method statically or through an inline
2312 // cache call.
2313 BarrierSet::barrier_set()->barrier_set_nmethod()->make_not_entrant(this);
2314 }
2315
2316 if (update_recompile_counts()) {
2317 // Mark the method as decompiled.
2318 inc_decompile_count();
2319 }
2320
2321 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2322 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2323 // If nmethod entry barriers are not supported, we won't mark
2324 // nmethods as on-stack when they become on-stack. So we
2325 // degrade to a less accurate flushing strategy, for now.
2326 mark_as_maybe_on_stack();
2327 }
2328
2329 // Change state
2330 bool success = try_transition(not_entrant);
2331 assert(success, "Transition can't fail");
2332
2333 // Log the transition once
2334 log_state_change(invalidation_reason);
2335
2336 // Remove nmethod from method.
2337 unlink_from_method();
2338
2339 } // leave critical region under NMethodState_lock
2340
2341 #if INCLUDE_JVMCI
2342 // Invalidate can't occur while holding the NMethodState_lock
2343 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2344 if (nmethod_data != nullptr) {
2345 nmethod_data->invalidate_nmethod_mirror(this, invalidation_reason);
2346 }
2347 #endif
2348
2349 #ifdef ASSERT
2350 if (is_osr_method() && method() != nullptr) {
2351 // Make sure osr nmethod is invalidated, i.e. not on the list
2352 bool found = method()->method_holder()->remove_osr_nmethod(this);
2353 assert(!found, "osr nmethod should have been invalidated");
2354 }
2355 #endif
2356
2357 return true;
2358 }
2359
2360 // For concurrent GCs, there must be a handshake between unlink and flush
2361 void nmethod::unlink() {
2362 if (is_unlinked()) {
2363 // Already unlinked.
2364 return;
2365 }
2366
2367 flush_dependencies();
2368
2369 // unlink_from_method will take the NMethodState_lock.
2370 // In this case we don't strictly need it when unlinking nmethods from
2371 // the Method, because it is only concurrently unlinked by
2372 // the entry barrier, which acquires the per nmethod lock.
2373 unlink_from_method();
2374
2375 if (is_osr_method()) {
2376 invalidate_osr_method();
2377 }
2378
2379 #if INCLUDE_JVMCI
2380 // Clear the link between this nmethod and a HotSpotNmethod mirror
2381 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2382 if (nmethod_data != nullptr) {
2383 nmethod_data->invalidate_nmethod_mirror(this, is_cold() ?
2384 nmethod::InvalidationReason::UNLOADING_COLD :
2385 nmethod::InvalidationReason::UNLOADING);
2386 }
2387 #endif
2388
2389 // Post before flushing as jmethodID is being used
2390 post_compiled_method_unload();
2391
2392 // Register for flushing when it is safe. For concurrent class unloading,
2393 // that would be after the unloading handshake, and for STW class unloading
2394 // that would be when getting back to the VM thread.
2395 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2396 }
2397
2398 void nmethod::purge(bool unregister_nmethod) {
2399
2400 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2401
2402 // completely deallocate this method
2403 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2404
2405 LogTarget(Debug, codecache) lt;
2406 if (lt.is_enabled()) {
2407 ResourceMark rm;
2408 LogStream ls(lt);
2409 const char* method_name = method()->name()->as_C_string();
2410 const size_t codecache_capacity = CodeCache::capacity()/1024;
2411 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2412 ls.print("Flushing nmethod %6d/" INTPTR_FORMAT ", level=%d, osr=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2413 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2414 _compile_id, p2i(this), _comp_level, is_osr_method(), is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2415 codecache_capacity, codecache_free_space, method_name, compiler_name());
2416 }
2417
2418 // We need to deallocate any ExceptionCache data.
2419 // Note that we do not need to grab the nmethod lock for this, it
2420 // better be thread safe if we're disposing of it!
2421 ExceptionCache* ec = exception_cache();
2422 while(ec != nullptr) {
2423 ExceptionCache* next = ec->next();
2424 delete ec;
2425 ec = next;
2426 }
2427 if (_pc_desc_container != nullptr) {
2428 delete _pc_desc_container;
2429 }
2430 delete[] _compiled_ic_data;
2431
2432 if (_immutable_data != blob_end()) {
2433 // Free memory if this was the last nmethod referencing immutable data
2434 if (dec_immutable_data_ref_count() == 0) {
2435 os::free(_immutable_data);
2436 }
2437
2438 _immutable_data = blob_end(); // Valid not null address
2439 }
2440
2441 if (unregister_nmethod) {
2442 Universe::heap()->unregister_nmethod(this);
2443 }
2444 CodeCache::unregister_old_nmethod(this);
2445
2446 JVMCI_ONLY( _metadata_size = 0; )
2447 CodeBlob::purge();
2448 }
2449
2450 oop nmethod::oop_at(int index) const {
2451 if (index == 0) {
2452 return nullptr;
2453 }
2454
2455 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2456 return bs_nm->oop_load_no_keepalive(this, index);
2457 }
2458
2459 oop nmethod::oop_at_phantom(int index) const {
2460 if (index == 0) {
2461 return nullptr;
2462 }
2463
2464 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2465 return bs_nm->oop_load_phantom(this, index);
2466 }
2467
2468 //
2469 // Notify all classes this nmethod is dependent on that it is no
2470 // longer dependent.
2471
2472 void nmethod::flush_dependencies() {
2473 if (!has_flushed_dependencies()) {
2474 set_has_flushed_dependencies(true);
2475 for (Dependencies::DepStream deps(this); deps.next(); ) {
2476 if (deps.type() == Dependencies::call_site_target_value) {
2477 // CallSite dependencies are managed on per-CallSite instance basis.
2478 oop call_site = deps.argument_oop(0);
2479 MethodHandles::clean_dependency_context(call_site);
2480 } else {
2481 InstanceKlass* ik = deps.context_type();
2482 if (ik == nullptr) {
2483 continue; // ignore things like evol_method
2484 }
2485 // During GC liveness of dependee determines class that needs to be updated.
2486 // The GC may clean dependency contexts concurrently and in parallel.
2487 ik->clean_dependency_context();
2488 }
2489 }
2490 }
2491 }
2492
2493 void nmethod::post_compiled_method(CompileTask* task) {
2494 task->mark_success();
2495 task->set_nm_content_size(content_size());
2496 task->set_nm_insts_size(insts_size());
2497 task->set_nm_total_size(total_size());
2498
2499 // JVMTI -- compiled method notification (must be done outside lock)
2500 post_compiled_method_load_event();
2501
2502 if (CompilationLog::log() != nullptr) {
2503 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2504 }
2505
2506 const DirectiveSet* directive = task->directive();
2507 maybe_print_nmethod(directive);
2508 }
2509
2510 #if INCLUDE_CDS
2511 static GrowableArrayCHeap<nmethod*, mtClassShared>* _delayed_compiled_method_load_events = nullptr;
2512
2513 void nmethod::add_delayed_compiled_method_load_event(nmethod* nm) {
2514 precond(CDSConfig::is_using_aot_linked_classes());
2515 precond(!ServiceThread::has_started());
2516
2517 // We are still in single threaded stage of VM bootstrap. No need to lock.
2518 if (_delayed_compiled_method_load_events == nullptr) {
2519 _delayed_compiled_method_load_events = new GrowableArrayCHeap<nmethod*, mtClassShared>();
2520 }
2521 _delayed_compiled_method_load_events->append(nm);
2522 }
2523
2524 void nmethod::post_delayed_compiled_method_load_events() {
2525 precond(ServiceThread::has_started());
2526 if (_delayed_compiled_method_load_events != nullptr) {
2527 for (int i = 0; i < _delayed_compiled_method_load_events->length(); i++) {
2528 nmethod* nm = _delayed_compiled_method_load_events->at(i);
2529 nm->post_compiled_method_load_event();
2530 }
2531 delete _delayed_compiled_method_load_events;
2532 _delayed_compiled_method_load_events = nullptr;
2533 }
2534 }
2535 #endif
2536
2537 // ------------------------------------------------------------------
2538 // post_compiled_method_load_event
2539 // new method for install_code() path
2540 // Transfer information from compilation to jvmti
2541 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2542 #if INCLUDE_CDS
2543 if (!ServiceThread::has_started()) {
2544 // With AOT-linked classes, we could compile wrappers for native methods before the
2545 // ServiceThread has been started, so we must delay the events to be posted later.
2546 assert(state == nullptr, "must be");
2547 add_delayed_compiled_method_load_event(this);
2548 return;
2549 }
2550 #endif
2551
2552 // This is a bad time for a safepoint. We don't want
2553 // this nmethod to get unloaded while we're queueing the event.
2554 NoSafepointVerifier nsv;
2555
2556 Method* m = method();
2557 HOTSPOT_COMPILED_METHOD_LOAD(
2558 (char *) m->klass_name()->bytes(),
2559 m->klass_name()->utf8_length(),
2560 (char *) m->name()->bytes(),
2561 m->name()->utf8_length(),
2562 (char *) m->signature()->bytes(),
2563 m->signature()->utf8_length(),
2564 insts_begin(), insts_size());
2565
2566
2567 if (JvmtiExport::should_post_compiled_method_load()) {
2568 // Only post unload events if load events are found.
2569 set_load_reported();
2570 // If a JavaThread hasn't been passed in, let the Service thread
2571 // (which is a real Java thread) post the event
2572 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2573 if (state == nullptr) {
2574 // Execute any barrier code for this nmethod as if it's called, since
2575 // keeping it alive looks like stack walking.
2576 run_nmethod_entry_barrier();
2577 ServiceThread::enqueue_deferred_event(&event);
2578 } else {
2579 // This enters the nmethod barrier outside in the caller.
2580 state->enqueue_event(&event);
2581 }
2582 }
2583 }
2584
2585 void nmethod::post_compiled_method_unload() {
2586 assert(_method != nullptr, "just checking");
2587 DTRACE_METHOD_UNLOAD_PROBE(method());
2588
2589 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2590 // post the event. The Method* will not be valid when this is freed.
2591
2592 // Don't bother posting the unload if the load event wasn't posted.
2593 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2594 JvmtiDeferredEvent event =
2595 JvmtiDeferredEvent::compiled_method_unload_event(
2596 method()->jmethod_id(), insts_begin());
2597 ServiceThread::enqueue_deferred_event(&event);
2598 }
2599 }
2600
2601 // Iterate over metadata calling this function. Used by RedefineClasses
2602 void nmethod::metadata_do(MetadataClosure* f) {
2603 {
2604 // Visit all immediate references that are embedded in the instruction stream.
2605 RelocIterator iter(this, oops_reloc_begin());
2606 while (iter.next()) {
2607 if (iter.type() == relocInfo::metadata_type) {
2608 metadata_Relocation* r = iter.metadata_reloc();
2609 // In this metadata, we must only follow those metadatas directly embedded in
2610 // the code. Other metadatas (oop_index>0) are seen as part of
2611 // the metadata section below.
2612 assert(1 == (r->metadata_is_immediate()) +
2613 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2614 "metadata must be found in exactly one place");
2615 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2616 Metadata* md = r->metadata_value();
2617 if (md != _method) f->do_metadata(md);
2618 }
2619 } else if (iter.type() == relocInfo::virtual_call_type) {
2620 // Check compiledIC holders associated with this nmethod
2621 ResourceMark rm;
2622 CompiledIC *ic = CompiledIC_at(&iter);
2623 ic->metadata_do(f);
2624 }
2625 }
2626 }
2627
2628 // Visit the metadata section
2629 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2630 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2631 Metadata* md = *p;
2632 f->do_metadata(md);
2633 }
2634
2635 // Visit metadata not embedded in the other places.
2636 if (_method != nullptr) f->do_metadata(_method);
2637 }
2638
2639 // Heuristic for nuking nmethods even though their oops are live.
2640 // Main purpose is to reduce code cache pressure and get rid of
2641 // nmethods that don't seem to be all that relevant any longer.
2642 bool nmethod::is_cold() {
2643 if (!MethodFlushing || is_not_installed()) {
2644 // No heuristic unloading at all
2645 return false;
2646 }
2647
2648 if (!is_maybe_on_stack() && is_not_entrant()) {
2649 // Not entrant nmethods that are not on any stack can just
2650 // be removed
2651 return true;
2652 }
2653
2654 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2655 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2656 // On platforms that don't support nmethod entry barriers, we can't
2657 // trust the temporal aspect of the gc epochs. So we can't detect
2658 // cold nmethods on such platforms.
2659 return false;
2660 }
2661
2662 if (!UseCodeCacheFlushing) {
2663 // Bail out if we don't heuristically remove nmethods
2664 return false;
2665 }
2666
2667 // Other code can be phased out more gradually after N GCs
2668 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2669 }
2670
2671 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2672 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2673 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2674 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2675 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2676
2677 class IsUnloadingState: public AllStatic {
2678 static const uint8_t _is_unloading_mask = 1;
2679 static const uint8_t _is_unloading_shift = 0;
2680 static const uint8_t _unloading_cycle_mask = 6;
2681 static const uint8_t _unloading_cycle_shift = 1;
2682
2683 static uint8_t set_is_unloading(uint8_t state, bool value) {
2684 state &= (uint8_t)~_is_unloading_mask;
2685 if (value) {
2686 state |= 1 << _is_unloading_shift;
2687 }
2688 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2689 return state;
2690 }
2691
2692 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2693 state &= (uint8_t)~_unloading_cycle_mask;
2694 state |= (uint8_t)(value << _unloading_cycle_shift);
2695 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2696 return state;
2697 }
2698
2699 public:
2700 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2701 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2702
2703 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2704 uint8_t state = 0;
2705 state = set_is_unloading(state, is_unloading);
2706 state = set_unloading_cycle(state, unloading_cycle);
2707 return state;
2708 }
2709 };
2710
2711 bool nmethod::is_unloading() {
2712 uint8_t state = AtomicAccess::load(&_is_unloading_state);
2713 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2714 if (state_is_unloading) {
2715 return true;
2716 }
2717 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2718 uint8_t current_cycle = CodeCache::unloading_cycle();
2719 if (state_unloading_cycle == current_cycle) {
2720 return false;
2721 }
2722
2723 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2724 // should be unloaded. This can be either because there is a dead oop,
2725 // or because is_cold() heuristically determines it is time to unload.
2726 state_unloading_cycle = current_cycle;
2727 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2728 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2729
2730 // Note that if an nmethod has dead oops, everyone will agree that the
2731 // nmethod is_unloading. However, the is_cold heuristics can yield
2732 // different outcomes, so we guard the computed result with a CAS
2733 // to ensure all threads have a shared view of whether an nmethod
2734 // is_unloading or not.
2735 uint8_t found_state = AtomicAccess::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2736
2737 if (found_state == state) {
2738 // First to change state, we win
2739 return state_is_unloading;
2740 } else {
2741 // State already set, so use it
2742 return IsUnloadingState::is_unloading(found_state);
2743 }
2744 }
2745
2746 void nmethod::clear_unloading_state() {
2747 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2748 AtomicAccess::store(&_is_unloading_state, state);
2749 }
2750
2751
2752 // This is called at the end of the strong tracing/marking phase of a
2753 // GC to unload an nmethod if it contains otherwise unreachable
2754 // oops or is heuristically found to be not important.
2755 void nmethod::do_unloading(bool unloading_occurred) {
2756 // Make sure the oop's ready to receive visitors
2757 if (is_unloading()) {
2758 unlink();
2759 } else {
2760 unload_nmethod_caches(unloading_occurred);
2761 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2762 if (bs_nm != nullptr) {
2763 bs_nm->disarm(this);
2764 }
2765 }
2766 }
2767
2768 void nmethod::oops_do(OopClosure* f) {
2769 // Prevent extra code cache walk for platforms that don't have immediate oops.
2770 if (relocInfo::mustIterateImmediateOopsInCode()) {
2771 RelocIterator iter(this, oops_reloc_begin());
2772
2773 while (iter.next()) {
2774 if (iter.type() == relocInfo::oop_type ) {
2775 oop_Relocation* r = iter.oop_reloc();
2776 // In this loop, we must only follow those oops directly embedded in
2777 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2778 assert(1 == (r->oop_is_immediate()) +
2779 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2780 "oop must be found in exactly one place");
2781 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2782 f->do_oop(r->oop_addr());
2783 }
2784 }
2785 }
2786 }
2787
2788 // Scopes
2789 // This includes oop constants not inlined in the code stream.
2790 for (oop* p = oops_begin(); p < oops_end(); p++) {
2791 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2792 f->do_oop(p);
2793 }
2794 }
2795
2796 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2797 // Process oops in the nmethod
2798 oops_do(cl);
2799
2800 // CodeCache unloading support
2801 mark_as_maybe_on_stack();
2802
2803 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2804 bs_nm->disarm(this);
2805
2806 // There's an assumption made that this function is not used by GCs that
2807 // relocate objects, and therefore we don't call fix_oop_relocations.
2808 }
2809
2810 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2811
2812 void nmethod::oops_do_log_change(const char* state) {
2813 LogTarget(Trace, gc, nmethod) lt;
2814 if (lt.is_enabled()) {
2815 LogStream ls(lt);
2816 CompileTask::print(&ls, this, state, true /* short_form */);
2817 }
2818 }
2819
2820 bool nmethod::oops_do_try_claim() {
2821 if (oops_do_try_claim_weak_request()) {
2822 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2823 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2824 return true;
2825 }
2826 return false;
2827 }
2828
2829 bool nmethod::oops_do_try_claim_weak_request() {
2830 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2831
2832 if ((_oops_do_mark_link == nullptr) &&
2833 (AtomicAccess::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2834 oops_do_log_change("oops_do, mark weak request");
2835 return true;
2836 }
2837 return false;
2838 }
2839
2840 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2841 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2842 }
2843
2844 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2845 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2846
2847 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2848 if (old_next == nullptr) {
2849 oops_do_log_change("oops_do, mark strong done");
2850 }
2851 return old_next;
2852 }
2853
2854 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2855 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2856 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2857
2858 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2859 if (old_next == next) {
2860 oops_do_log_change("oops_do, mark strong request");
2861 }
2862 return old_next;
2863 }
2864
2865 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2866 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2867 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2868
2869 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2870 if (old_next == next) {
2871 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2872 return true;
2873 }
2874 return false;
2875 }
2876
2877 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2878 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2879
2880 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2881 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2882 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2883
2884 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2885 // Self-loop if needed.
2886 if (old_head == nullptr) {
2887 old_head = this;
2888 }
2889 // Try to install end of list and weak done tag.
2890 if (AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
2891 oops_do_log_change("oops_do, mark weak done");
2892 return nullptr;
2893 } else {
2894 return old_head;
2895 }
2896 }
2897
2898 void nmethod::oops_do_add_to_list_as_strong_done() {
2899 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2900
2901 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2902 // Self-loop if needed.
2903 if (old_head == nullptr) {
2904 old_head = this;
2905 }
2906 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2907 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2908
2909 oops_do_set_strong_done(old_head);
2910 }
2911
2912 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2913 if (!oops_do_try_claim_weak_request()) {
2914 // Failed to claim for weak processing.
2915 oops_do_log_change("oops_do, mark weak request fail");
2916 return;
2917 }
2918
2919 p->do_regular_processing(this);
2920
2921 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2922 if (old_head == nullptr) {
2923 return;
2924 }
2925 oops_do_log_change("oops_do, mark weak done fail");
2926 // Adding to global list failed, another thread added a strong request.
2927 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2928 "must be but is %u", extract_state(_oops_do_mark_link));
2929
2930 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2931
2932 oops_do_set_strong_done(old_head);
2933 // Do missing strong processing.
2934 p->do_remaining_strong_processing(this);
2935 }
2936
2937 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2938 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2939 if (next_raw == nullptr) {
2940 p->do_regular_processing(this);
2941 oops_do_add_to_list_as_strong_done();
2942 return;
2943 }
2944 // Claim failed. Figure out why and handle it.
2945 if (oops_do_has_weak_request(next_raw)) {
2946 oops_do_mark_link* old = next_raw;
2947 // Claim failed because being weak processed (state == "weak request").
2948 // Try to request deferred strong processing.
2949 next_raw = oops_do_try_add_strong_request(old);
2950 if (next_raw == old) {
2951 // Successfully requested deferred strong processing.
2952 return;
2953 }
2954 // Failed because of a concurrent transition. No longer in "weak request" state.
2955 }
2956 if (oops_do_has_any_strong_state(next_raw)) {
2957 // Already claimed for strong processing or requested for such.
2958 return;
2959 }
2960 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2961 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2962 p->do_remaining_strong_processing(this);
2963 return;
2964 }
2965 // Claim failed, some other thread got it.
2966 }
2967
2968 void nmethod::oops_do_marking_prologue() {
2969 assert_at_safepoint();
2970
2971 log_trace(gc, nmethod)("oops_do_marking_prologue");
2972 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2973 }
2974
2975 void nmethod::oops_do_marking_epilogue() {
2976 assert_at_safepoint();
2977
2978 nmethod* next = _oops_do_mark_nmethods;
2979 _oops_do_mark_nmethods = nullptr;
2980 if (next != nullptr) {
2981 nmethod* cur;
2982 do {
2983 cur = next;
2984 next = extract_nmethod(cur->_oops_do_mark_link);
2985 cur->_oops_do_mark_link = nullptr;
2986 DEBUG_ONLY(cur->verify_oop_relocations());
2987
2988 LogTarget(Trace, gc, nmethod) lt;
2989 if (lt.is_enabled()) {
2990 LogStream ls(lt);
2991 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2992 }
2993 // End if self-loop has been detected.
2994 } while (cur != next);
2995 }
2996 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2997 }
2998
2999 inline bool includes(void* p, void* from, void* to) {
3000 return from <= p && p < to;
3001 }
3002
3003
3004 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
3005 assert(count >= 2, "must be sentinel values, at least");
3006
3007 #ifdef ASSERT
3008 // must be sorted and unique; we do a binary search in find_pc_desc()
3009 int prev_offset = pcs[0].pc_offset();
3010 assert(prev_offset == PcDesc::lower_offset_limit,
3011 "must start with a sentinel");
3012 for (int i = 1; i < count; i++) {
3013 int this_offset = pcs[i].pc_offset();
3014 assert(this_offset > prev_offset, "offsets must be sorted");
3015 prev_offset = this_offset;
3016 }
3017 assert(prev_offset == PcDesc::upper_offset_limit,
3018 "must end with a sentinel");
3019 #endif //ASSERT
3020
3021 int size = count * sizeof(PcDesc);
3022 assert(scopes_pcs_size() >= size, "oob");
3023 memcpy(scopes_pcs_begin(), pcs, size);
3024
3025 // Adjust the final sentinel downward.
3026 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
3027 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
3028 last_pc->set_pc_offset(content_size() + 1);
3029 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
3030 // Fill any rounding gaps with copies of the last record.
3031 last_pc[1] = last_pc[0];
3032 }
3033 // The following assert could fail if sizeof(PcDesc) is not
3034 // an integral multiple of oopSize (the rounding term).
3035 // If it fails, change the logic to always allocate a multiple
3036 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
3037 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
3038 }
3039
3040 void nmethod::copy_scopes_data(u_char* buffer, int size) {
3041 assert(scopes_data_size() >= size, "oob");
3042 memcpy(scopes_data_begin(), buffer, size);
3043 }
3044
3045 #ifdef ASSERT
3046 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
3047 PcDesc* res = nullptr;
3048 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
3049 "must start with a sentinel");
3050 // lower + 1 to exclude initial sentinel
3051 for (PcDesc* p = lower + 1; p < upper; p++) {
3052 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
3053 if (match_desc(p, pc_offset, approximate)) {
3054 if (res == nullptr) {
3055 res = p;
3056 } else {
3057 res = (PcDesc*) badAddress;
3058 }
3059 }
3060 }
3061 return res;
3062 }
3063 #endif
3064
3065
3066 #ifndef PRODUCT
3067 // Version of method to collect statistic
3068 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
3069 PcDesc* lower, PcDesc* upper) {
3070 ++pc_nmethod_stats.pc_desc_queries;
3071 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
3072
3073 PcDesc* desc = _pc_desc_cache.last_pc_desc();
3074 assert(desc != nullptr, "PcDesc cache should be initialized already");
3075 if (desc->pc_offset() == (pc - code_begin)) {
3076 // Cached value matched
3077 ++pc_nmethod_stats.pc_desc_tests;
3078 ++pc_nmethod_stats.pc_desc_repeats;
3079 return desc;
3080 }
3081 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
3082 }
3083 #endif
3084
3085 // Finds a PcDesc with real-pc equal to "pc"
3086 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
3087 PcDesc* lower_incl, PcDesc* upper_incl) {
3088 if ((pc < code_begin) ||
3089 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
3090 return nullptr; // PC is wildly out of range
3091 }
3092 int pc_offset = (int) (pc - code_begin);
3093
3094 // Check the PcDesc cache if it contains the desired PcDesc
3095 // (This as an almost 100% hit rate.)
3096 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
3097 if (res != nullptr) {
3098 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
3099 return res;
3100 }
3101
3102 // Fallback algorithm: quasi-linear search for the PcDesc
3103 // Find the last pc_offset less than the given offset.
3104 // The successor must be the required match, if there is a match at all.
3105 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
3106 PcDesc* lower = lower_incl; // this is initial sentinel
3107 PcDesc* upper = upper_incl - 1; // exclude final sentinel
3108 if (lower >= upper) return nullptr; // no PcDescs at all
3109
3110 #define assert_LU_OK \
3111 /* invariant on lower..upper during the following search: */ \
3112 assert(lower->pc_offset() < pc_offset, "sanity"); \
3113 assert(upper->pc_offset() >= pc_offset, "sanity")
3114 assert_LU_OK;
3115
3116 // Use the last successful return as a split point.
3117 PcDesc* mid = _pc_desc_cache.last_pc_desc();
3118 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3119 if (mid->pc_offset() < pc_offset) {
3120 lower = mid;
3121 } else {
3122 upper = mid;
3123 }
3124
3125 // Take giant steps at first (4096, then 256, then 16, then 1)
3126 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3127 const int RADIX = (1 << LOG2_RADIX);
3128 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3129 while ((mid = lower + step) < upper) {
3130 assert_LU_OK;
3131 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3132 if (mid->pc_offset() < pc_offset) {
3133 lower = mid;
3134 } else {
3135 upper = mid;
3136 break;
3137 }
3138 }
3139 assert_LU_OK;
3140 }
3141
3142 // Sneak up on the value with a linear search of length ~16.
3143 while (true) {
3144 assert_LU_OK;
3145 mid = lower + 1;
3146 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3147 if (mid->pc_offset() < pc_offset) {
3148 lower = mid;
3149 } else {
3150 upper = mid;
3151 break;
3152 }
3153 }
3154 #undef assert_LU_OK
3155
3156 if (match_desc(upper, pc_offset, approximate)) {
3157 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3158 if (!Thread::current_in_asgct()) {
3159 // we don't want to modify the cache if we're in ASGCT
3160 // which is typically called in a signal handler
3161 _pc_desc_cache.add_pc_desc(upper);
3162 }
3163 return upper;
3164 } else {
3165 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3166 return nullptr;
3167 }
3168 }
3169
3170 bool nmethod::check_dependency_on(DepChange& changes) {
3171 // What has happened:
3172 // 1) a new class dependee has been added
3173 // 2) dependee and all its super classes have been marked
3174 bool found_check = false; // set true if we are upset
3175 for (Dependencies::DepStream deps(this); deps.next(); ) {
3176 // Evaluate only relevant dependencies.
3177 if (deps.spot_check_dependency_at(changes) != nullptr) {
3178 found_check = true;
3179 NOT_DEBUG(break);
3180 }
3181 }
3182 return found_check;
3183 }
3184
3185 // Called from mark_for_deoptimization, when dependee is invalidated.
3186 bool nmethod::is_dependent_on_method(Method* dependee) {
3187 for (Dependencies::DepStream deps(this); deps.next(); ) {
3188 if (deps.type() != Dependencies::evol_method)
3189 continue;
3190 Method* method = deps.method_argument(0);
3191 if (method == dependee) return true;
3192 }
3193 return false;
3194 }
3195
3196 void nmethod_init() {
3197 // make sure you didn't forget to adjust the filler fields
3198 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3199 }
3200
3201 // -----------------------------------------------------------------------------
3202 // Verification
3203
3204 class VerifyOopsClosure: public OopClosure {
3205 nmethod* _nm;
3206 bool _ok;
3207 public:
3208 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3209 bool ok() { return _ok; }
3210 virtual void do_oop(oop* p) {
3211 if (oopDesc::is_oop_or_null(*p)) return;
3212 // Print diagnostic information before calling print_nmethod().
3213 // Assertions therein might prevent call from returning.
3214 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3215 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3216 if (_ok) {
3217 _nm->print_nmethod(true);
3218 _ok = false;
3219 }
3220 }
3221 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3222 };
3223
3224 class VerifyMetadataClosure: public MetadataClosure {
3225 public:
3226 void do_metadata(Metadata* md) {
3227 if (md->is_method()) {
3228 Method* method = (Method*)md;
3229 assert(!method->is_old(), "Should not be installing old methods");
3230 }
3231 }
3232 };
3233
3234
3235 void nmethod::verify() {
3236 if (is_not_entrant())
3237 return;
3238
3239 // assert(oopDesc::is_oop(method()), "must be valid");
3240
3241 ResourceMark rm;
3242
3243 if (!CodeCache::contains(this)) {
3244 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3245 }
3246
3247 if(is_native_method() )
3248 return;
3249
3250 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3251 if (nm != this) {
3252 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3253 }
3254
3255 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3256 if (! p->verify(this)) {
3257 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3258 }
3259 }
3260
3261 #ifdef ASSERT
3262 #if INCLUDE_JVMCI
3263 {
3264 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3265 ImmutableOopMapSet* oms = oop_maps();
3266 ImplicitExceptionTable implicit_table(this);
3267 for (uint i = 0; i < implicit_table.len(); i++) {
3268 int exec_offset = (int) implicit_table.get_exec_offset(i);
3269 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3270 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3271 bool found = false;
3272 for (int i = 0, imax = oms->count(); i < imax; i++) {
3273 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3274 found = true;
3275 break;
3276 }
3277 }
3278 assert(found, "missing oopmap");
3279 }
3280 }
3281 }
3282 #endif
3283 #endif
3284
3285 VerifyOopsClosure voc(this);
3286 oops_do(&voc);
3287 assert(voc.ok(), "embedded oops must be OK");
3288 Universe::heap()->verify_nmethod(this);
3289
3290 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3291 nm->method()->external_name(), p2i(_oops_do_mark_link));
3292 verify_scopes();
3293
3294 CompiledICLocker nm_verify(this);
3295 VerifyMetadataClosure vmc;
3296 metadata_do(&vmc);
3297 }
3298
3299
3300 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3301
3302 // Verify IC only when nmethod installation is finished.
3303 if (!is_not_installed()) {
3304 if (CompiledICLocker::is_safe(this)) {
3305 if (is_inline_cache) {
3306 CompiledIC_at(this, call_site);
3307 } else {
3308 CompiledDirectCall::at(call_site);
3309 }
3310 } else {
3311 CompiledICLocker ml_verify(this);
3312 if (is_inline_cache) {
3313 CompiledIC_at(this, call_site);
3314 } else {
3315 CompiledDirectCall::at(call_site);
3316 }
3317 }
3318 }
3319
3320 HandleMark hm(Thread::current());
3321
3322 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3323 assert(pd != nullptr, "PcDesc must exist");
3324 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3325 !sd->is_top(); sd = sd->sender()) {
3326 sd->verify();
3327 }
3328 }
3329
3330 void nmethod::verify_scopes() {
3331 if( !method() ) return; // Runtime stubs have no scope
3332 if (method()->is_native()) return; // Ignore stub methods.
3333 // iterate through all interrupt point
3334 // and verify the debug information is valid.
3335 RelocIterator iter(this);
3336 while (iter.next()) {
3337 address stub = nullptr;
3338 switch (iter.type()) {
3339 case relocInfo::virtual_call_type:
3340 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3341 break;
3342 case relocInfo::opt_virtual_call_type:
3343 stub = iter.opt_virtual_call_reloc()->static_stub();
3344 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3345 break;
3346 case relocInfo::static_call_type:
3347 stub = iter.static_call_reloc()->static_stub();
3348 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3349 break;
3350 case relocInfo::runtime_call_type:
3351 case relocInfo::runtime_call_w_cp_type: {
3352 address destination = iter.reloc()->value();
3353 // Right now there is no way to find out which entries support
3354 // an interrupt point. It would be nice if we had this
3355 // information in a table.
3356 break;
3357 }
3358 default:
3359 break;
3360 }
3361 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3362 }
3363 }
3364
3365
3366 // -----------------------------------------------------------------------------
3367 // Printing operations
3368
3369 void nmethod::print_on_impl(outputStream* st) const {
3370 ResourceMark rm;
3371
3372 st->print("Compiled method ");
3373
3374 if (is_compiled_by_c1()) {
3375 st->print("(c1) ");
3376 } else if (is_compiled_by_c2()) {
3377 st->print("(c2) ");
3378 } else if (is_compiled_by_jvmci()) {
3379 st->print("(JVMCI) ");
3380 } else {
3381 st->print("(n/a) ");
3382 }
3383
3384 print_on_with_msg(st, nullptr);
3385
3386 if (WizardMode) {
3387 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3388 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3389 st->print(" { ");
3390 st->print_cr("%s ", state());
3391 st->print_cr("}:");
3392 }
3393 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3394 p2i(this),
3395 p2i(this) + size(),
3396 size());
3397 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3398 p2i(consts_begin()),
3399 p2i(consts_end()),
3400 consts_size());
3401 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3402 p2i(insts_begin()),
3403 p2i(insts_end()),
3404 insts_size());
3405 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3406 p2i(stub_begin()),
3407 p2i(stub_end()),
3408 stub_size());
3409 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3410 p2i(oops_begin()),
3411 p2i(oops_end()),
3412 oops_size());
3413 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3414 p2i(mutable_data_begin()),
3415 p2i(mutable_data_end()),
3416 mutable_data_size());
3417 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3418 p2i(relocation_begin()),
3419 p2i(relocation_end()),
3420 relocation_size());
3421 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3422 p2i(metadata_begin()),
3423 p2i(metadata_end()),
3424 metadata_size());
3425 #if INCLUDE_JVMCI
3426 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3427 p2i(jvmci_data_begin()),
3428 p2i(jvmci_data_end()),
3429 jvmci_data_size());
3430 #endif
3431 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3432 p2i(immutable_data_begin()),
3433 p2i(immutable_data_end()),
3434 immutable_data_size());
3435 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3436 p2i(dependencies_begin()),
3437 p2i(dependencies_end()),
3438 dependencies_size());
3439 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3440 p2i(nul_chk_table_begin()),
3441 p2i(nul_chk_table_end()),
3442 nul_chk_table_size());
3443 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3444 p2i(handler_table_begin()),
3445 p2i(handler_table_end()),
3446 handler_table_size());
3447 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3448 p2i(scopes_pcs_begin()),
3449 p2i(scopes_pcs_end()),
3450 scopes_pcs_size());
3451 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3452 p2i(scopes_data_begin()),
3453 p2i(scopes_data_end()),
3454 scopes_data_size());
3455 #if INCLUDE_JVMCI
3456 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3457 p2i(speculations_begin()),
3458 p2i(speculations_end()),
3459 speculations_size());
3460 #endif
3461 }
3462
3463 void nmethod::print_code() {
3464 ResourceMark m;
3465 ttyLocker ttyl;
3466 // Call the specialized decode method of this class.
3467 decode(tty);
3468 }
3469
3470 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3471
3472 void nmethod::print_dependencies_on(outputStream* out) {
3473 ResourceMark rm;
3474 stringStream st;
3475 st.print_cr("Dependencies:");
3476 for (Dependencies::DepStream deps(this); deps.next(); ) {
3477 deps.print_dependency(&st);
3478 InstanceKlass* ctxk = deps.context_type();
3479 if (ctxk != nullptr) {
3480 if (ctxk->is_dependent_nmethod(this)) {
3481 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3482 }
3483 }
3484 deps.log_dependency(); // put it into the xml log also
3485 }
3486 out->print_raw(st.as_string());
3487 }
3488 #endif
3489
3490 #if defined(SUPPORT_DATA_STRUCTS)
3491
3492 // Print the oops from the underlying CodeBlob.
3493 void nmethod::print_oops(outputStream* st) {
3494 ResourceMark m;
3495 st->print("Oops:");
3496 if (oops_begin() < oops_end()) {
3497 st->cr();
3498 for (oop* p = oops_begin(); p < oops_end(); p++) {
3499 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3500 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3501 if (Universe::contains_non_oop_word(p)) {
3502 st->print_cr("NON_OOP");
3503 continue; // skip non-oops
3504 }
3505 if (*p == nullptr) {
3506 st->print_cr("nullptr-oop");
3507 continue; // skip non-oops
3508 }
3509 (*p)->print_value_on(st);
3510 st->cr();
3511 }
3512 } else {
3513 st->print_cr(" <list empty>");
3514 }
3515 }
3516
3517 // Print metadata pool.
3518 void nmethod::print_metadata(outputStream* st) {
3519 ResourceMark m;
3520 st->print("Metadata:");
3521 if (metadata_begin() < metadata_end()) {
3522 st->cr();
3523 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3524 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3525 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3526 if (*p && *p != Universe::non_oop_word()) {
3527 (*p)->print_value_on(st);
3528 }
3529 st->cr();
3530 }
3531 } else {
3532 st->print_cr(" <list empty>");
3533 }
3534 }
3535
3536 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3537 void nmethod::print_scopes_on(outputStream* st) {
3538 // Find the first pc desc for all scopes in the code and print it.
3539 ResourceMark rm;
3540 st->print("scopes:");
3541 if (scopes_pcs_begin() < scopes_pcs_end()) {
3542 st->cr();
3543 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3544 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3545 continue;
3546
3547 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3548 while (sd != nullptr) {
3549 sd->print_on(st, p); // print output ends with a newline
3550 sd = sd->sender();
3551 }
3552 }
3553 } else {
3554 st->print_cr(" <list empty>");
3555 }
3556 }
3557 #endif
3558
3559 #ifndef PRODUCT // RelocIterator does support printing only then.
3560 void nmethod::print_relocations() {
3561 ResourceMark m; // in case methods get printed via the debugger
3562 tty->print_cr("relocations:");
3563 RelocIterator iter(this);
3564 iter.print_on(tty);
3565 }
3566 #endif
3567
3568 void nmethod::print_pcs_on(outputStream* st) {
3569 ResourceMark m; // in case methods get printed via debugger
3570 st->print("pc-bytecode offsets:");
3571 if (scopes_pcs_begin() < scopes_pcs_end()) {
3572 st->cr();
3573 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3574 p->print_on(st, this); // print output ends with a newline
3575 }
3576 } else {
3577 st->print_cr(" <list empty>");
3578 }
3579 }
3580
3581 void nmethod::print_handler_table() {
3582 ExceptionHandlerTable(this).print(code_begin());
3583 }
3584
3585 void nmethod::print_nul_chk_table() {
3586 ImplicitExceptionTable(this).print(code_begin());
3587 }
3588
3589 void nmethod::print_recorded_oop(int log_n, int i) {
3590 void* value;
3591
3592 if (i == 0) {
3593 value = nullptr;
3594 } else {
3595 // Be careful around non-oop words. Don't create an oop
3596 // with that value, or it will assert in verification code.
3597 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3598 value = Universe::non_oop_word();
3599 } else {
3600 value = oop_at(i);
3601 }
3602 }
3603
3604 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3605
3606 if (value == Universe::non_oop_word()) {
3607 tty->print("non-oop word");
3608 } else {
3609 if (value == nullptr) {
3610 tty->print("nullptr-oop");
3611 } else {
3612 oop_at(i)->print_value_on(tty);
3613 }
3614 }
3615
3616 tty->cr();
3617 }
3618
3619 void nmethod::print_recorded_oops() {
3620 const int n = oops_count();
3621 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3622 tty->print("Recorded oops:");
3623 if (n > 0) {
3624 tty->cr();
3625 for (int i = 0; i < n; i++) {
3626 print_recorded_oop(log_n, i);
3627 }
3628 } else {
3629 tty->print_cr(" <list empty>");
3630 }
3631 }
3632
3633 void nmethod::print_recorded_metadata() {
3634 const int n = metadata_count();
3635 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3636 tty->print("Recorded metadata:");
3637 if (n > 0) {
3638 tty->cr();
3639 for (int i = 0; i < n; i++) {
3640 Metadata* m = metadata_at(i);
3641 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3642 if (m == (Metadata*)Universe::non_oop_word()) {
3643 tty->print("non-metadata word");
3644 } else if (m == nullptr) {
3645 tty->print("nullptr-oop");
3646 } else {
3647 Metadata::print_value_on_maybe_null(tty, m);
3648 }
3649 tty->cr();
3650 }
3651 } else {
3652 tty->print_cr(" <list empty>");
3653 }
3654 }
3655 #endif
3656
3657 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3658
3659 void nmethod::print_constant_pool(outputStream* st) {
3660 //-----------------------------------
3661 //---< Print the constant pool >---
3662 //-----------------------------------
3663 int consts_size = this->consts_size();
3664 if ( consts_size > 0 ) {
3665 unsigned char* cstart = this->consts_begin();
3666 unsigned char* cp = cstart;
3667 unsigned char* cend = cp + consts_size;
3668 unsigned int bytes_per_line = 4;
3669 unsigned int CP_alignment = 8;
3670 unsigned int n;
3671
3672 st->cr();
3673
3674 //---< print CP header to make clear what's printed >---
3675 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3676 n = bytes_per_line;
3677 st->print_cr("[Constant Pool]");
3678 Disassembler::print_location(cp, cstart, cend, st, true, true);
3679 Disassembler::print_hexdata(cp, n, st, true);
3680 st->cr();
3681 } else {
3682 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3683 st->print_cr("[Constant Pool (unaligned)]");
3684 }
3685
3686 //---< print CP contents, bytes_per_line at a time >---
3687 while (cp < cend) {
3688 Disassembler::print_location(cp, cstart, cend, st, true, false);
3689 Disassembler::print_hexdata(cp, n, st, false);
3690 cp += n;
3691 n = bytes_per_line;
3692 st->cr();
3693 }
3694
3695 //---< Show potential alignment gap between constant pool and code >---
3696 cend = code_begin();
3697 if( cp < cend ) {
3698 n = 4;
3699 st->print_cr("[Code entry alignment]");
3700 while (cp < cend) {
3701 Disassembler::print_location(cp, cstart, cend, st, false, false);
3702 cp += n;
3703 st->cr();
3704 }
3705 }
3706 } else {
3707 st->print_cr("[Constant Pool (empty)]");
3708 }
3709 st->cr();
3710 }
3711
3712 #endif
3713
3714 // Disassemble this nmethod.
3715 // Print additional debug information, if requested. This could be code
3716 // comments, block comments, profiling counters, etc.
3717 // The undisassembled format is useful no disassembler library is available.
3718 // The resulting hex dump (with markers) can be disassembled later, or on
3719 // another system, when/where a disassembler library is available.
3720 void nmethod::decode2(outputStream* ost) const {
3721
3722 // Called from frame::back_trace_with_decode without ResourceMark.
3723 ResourceMark rm;
3724
3725 // Make sure we have a valid stream to print on.
3726 outputStream* st = ost ? ost : tty;
3727
3728 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3729 const bool use_compressed_format = true;
3730 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3731 AbstractDisassembler::show_block_comment());
3732 #else
3733 const bool use_compressed_format = Disassembler::is_abstract();
3734 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3735 AbstractDisassembler::show_block_comment());
3736 #endif
3737
3738 st->cr();
3739 this->print_on(st);
3740 st->cr();
3741
3742 #if defined(SUPPORT_ASSEMBLY)
3743 //----------------------------------
3744 //---< Print real disassembly >---
3745 //----------------------------------
3746 if (! use_compressed_format) {
3747 st->print_cr("[Disassembly]");
3748 Disassembler::decode(const_cast<nmethod*>(this), st);
3749 st->bol();
3750 st->print_cr("[/Disassembly]");
3751 return;
3752 }
3753 #endif
3754
3755 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3756
3757 // Compressed undisassembled disassembly format.
3758 // The following status values are defined/supported:
3759 // = 0 - currently at bol() position, nothing printed yet on current line.
3760 // = 1 - currently at position after print_location().
3761 // > 1 - in the midst of printing instruction stream bytes.
3762 int compressed_format_idx = 0;
3763 int code_comment_column = 0;
3764 const int instr_maxlen = Assembler::instr_maxlen();
3765 const uint tabspacing = 8;
3766 unsigned char* start = this->code_begin();
3767 unsigned char* p = this->code_begin();
3768 unsigned char* end = this->code_end();
3769 unsigned char* pss = p; // start of a code section (used for offsets)
3770
3771 if ((start == nullptr) || (end == nullptr)) {
3772 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3773 return;
3774 }
3775 #endif
3776
3777 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3778 //---< plain abstract disassembly, no comments or anything, just section headers >---
3779 if (use_compressed_format && ! compressed_with_comments) {
3780 const_cast<nmethod*>(this)->print_constant_pool(st);
3781
3782 st->bol();
3783 st->cr();
3784 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3785 //---< Open the output (Marker for post-mortem disassembler) >---
3786 st->print_cr("[MachCode]");
3787 const char* header = nullptr;
3788 address p0 = p;
3789 while (p < end) {
3790 address pp = p;
3791 while ((p < end) && (header == nullptr)) {
3792 header = nmethod_section_label(p);
3793 pp = p;
3794 p += Assembler::instr_len(p);
3795 }
3796 if (pp > p0) {
3797 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3798 p0 = pp;
3799 p = pp;
3800 header = nullptr;
3801 } else if (header != nullptr) {
3802 st->bol();
3803 st->print_cr("%s", header);
3804 header = nullptr;
3805 }
3806 }
3807 //---< Close the output (Marker for post-mortem disassembler) >---
3808 st->bol();
3809 st->print_cr("[/MachCode]");
3810 return;
3811 }
3812 #endif
3813
3814 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3815 //---< abstract disassembly with comments and section headers merged in >---
3816 if (compressed_with_comments) {
3817 const_cast<nmethod*>(this)->print_constant_pool(st);
3818
3819 st->bol();
3820 st->cr();
3821 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3822 //---< Open the output (Marker for post-mortem disassembler) >---
3823 st->print_cr("[MachCode]");
3824 while ((p < end) && (p != nullptr)) {
3825 const int instruction_size_in_bytes = Assembler::instr_len(p);
3826
3827 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3828 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3829 // Prints nmethod_section_label as well.
3830 if (AbstractDisassembler::show_block_comment()) {
3831 print_block_comment(st, p);
3832 if (st->position() == 0) {
3833 compressed_format_idx = 0;
3834 }
3835 }
3836
3837 //---< New location information after line break >---
3838 if (compressed_format_idx == 0) {
3839 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3840 compressed_format_idx = 1;
3841 }
3842
3843 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3844 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3845 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3846
3847 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3848 //---< interrupt instruction byte stream for code comment >---
3849 if (compressed_format_idx > 1) {
3850 st->cr(); // interrupt byte stream
3851 st->cr(); // add an empty line
3852 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3853 }
3854 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3855 st->bol();
3856 compressed_format_idx = 0;
3857 }
3858
3859 //---< New location information after line break >---
3860 if (compressed_format_idx == 0) {
3861 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3862 compressed_format_idx = 1;
3863 }
3864
3865 //---< Nicely align instructions for readability >---
3866 if (compressed_format_idx > 1) {
3867 Disassembler::print_delimiter(st);
3868 }
3869
3870 //---< Now, finally, print the actual instruction bytes >---
3871 unsigned char* p0 = p;
3872 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3873 compressed_format_idx += (int)(p - p0);
3874
3875 if (Disassembler::start_newline(compressed_format_idx-1)) {
3876 st->cr();
3877 compressed_format_idx = 0;
3878 }
3879 }
3880 //---< Close the output (Marker for post-mortem disassembler) >---
3881 st->bol();
3882 st->print_cr("[/MachCode]");
3883 return;
3884 }
3885 #endif
3886 }
3887
3888 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3889
3890 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3891 RelocIterator iter(this, begin, end);
3892 bool have_one = false;
3893 while (iter.next()) {
3894 have_one = true;
3895 switch (iter.type()) {
3896 case relocInfo::none: {
3897 // Skip it and check next
3898 break;
3899 }
3900 case relocInfo::oop_type: {
3901 // Get a non-resizable resource-allocated stringStream.
3902 // Our callees make use of (nested) ResourceMarks.
3903 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3904 oop_Relocation* r = iter.oop_reloc();
3905 oop obj = r->oop_value();
3906 st.print("oop(");
3907 if (obj == nullptr) st.print("nullptr");
3908 else obj->print_value_on(&st);
3909 st.print(")");
3910 return st.as_string();
3911 }
3912 case relocInfo::metadata_type: {
3913 stringStream st;
3914 metadata_Relocation* r = iter.metadata_reloc();
3915 Metadata* obj = r->metadata_value();
3916 st.print("metadata(");
3917 if (obj == nullptr) st.print("nullptr");
3918 else obj->print_value_on(&st);
3919 st.print(")");
3920 return st.as_string();
3921 }
3922 case relocInfo::runtime_call_type:
3923 case relocInfo::runtime_call_w_cp_type: {
3924 stringStream st;
3925 st.print("runtime_call");
3926 CallRelocation* r = (CallRelocation*)iter.reloc();
3927 address dest = r->destination();
3928 if (StubRoutines::contains(dest)) {
3929 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3930 if (desc == nullptr) {
3931 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3932 }
3933 if (desc != nullptr) {
3934 st.print(" Stub::%s", desc->name());
3935 return st.as_string();
3936 }
3937 }
3938 CodeBlob* cb = CodeCache::find_blob(dest);
3939 if (cb != nullptr) {
3940 st.print(" %s", cb->name());
3941 } else {
3942 ResourceMark rm;
3943 const int buflen = 1024;
3944 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3945 int offset;
3946 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3947 st.print(" %s", buf);
3948 if (offset != 0) {
3949 st.print("+%d", offset);
3950 }
3951 }
3952 }
3953 return st.as_string();
3954 }
3955 case relocInfo::virtual_call_type: {
3956 stringStream st;
3957 st.print_raw("virtual_call");
3958 virtual_call_Relocation* r = iter.virtual_call_reloc();
3959 Method* m = r->method_value();
3960 if (m != nullptr) {
3961 assert(m->is_method(), "");
3962 m->print_short_name(&st);
3963 }
3964 return st.as_string();
3965 }
3966 case relocInfo::opt_virtual_call_type: {
3967 stringStream st;
3968 st.print_raw("optimized virtual_call");
3969 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3970 Method* m = r->method_value();
3971 if (m != nullptr) {
3972 assert(m->is_method(), "");
3973 m->print_short_name(&st);
3974 }
3975 return st.as_string();
3976 }
3977 case relocInfo::static_call_type: {
3978 stringStream st;
3979 st.print_raw("static_call");
3980 static_call_Relocation* r = iter.static_call_reloc();
3981 Method* m = r->method_value();
3982 if (m != nullptr) {
3983 assert(m->is_method(), "");
3984 m->print_short_name(&st);
3985 }
3986 return st.as_string();
3987 }
3988 case relocInfo::static_stub_type: return "static_stub";
3989 case relocInfo::external_word_type: return "external_word";
3990 case relocInfo::internal_word_type: return "internal_word";
3991 case relocInfo::section_word_type: return "section_word";
3992 case relocInfo::poll_type: return "poll";
3993 case relocInfo::poll_return_type: return "poll_return";
3994 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3995 case relocInfo::entry_guard_type: return "entry_guard";
3996 case relocInfo::post_call_nop_type: return "post_call_nop";
3997 case relocInfo::barrier_type: {
3998 barrier_Relocation* const reloc = iter.barrier_reloc();
3999 stringStream st;
4000 st.print("barrier format=%d", reloc->format());
4001 return st.as_string();
4002 }
4003
4004 case relocInfo::type_mask: return "type_bit_mask";
4005
4006 default: {
4007 stringStream st;
4008 st.print("unknown relocInfo=%d", (int) iter.type());
4009 return st.as_string();
4010 }
4011 }
4012 }
4013 return have_one ? "other" : nullptr;
4014 }
4015
4016 // Return the last scope in (begin..end]
4017 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
4018 PcDesc* p = pc_desc_near(begin+1);
4019 if (p != nullptr && p->real_pc(this) <= end) {
4020 return new ScopeDesc(this, p);
4021 }
4022 return nullptr;
4023 }
4024
4025 const char* nmethod::nmethod_section_label(address pos) const {
4026 const char* label = nullptr;
4027 if (pos == code_begin()) label = "[Instructions begin]";
4028 if (pos == entry_point()) label = "[Entry Point]";
4029 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
4030 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
4031 // Check stub_code before checking exception_handler or deopt_handler.
4032 if (pos == this->stub_begin()) label = "[Stub Code]";
4033 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
4034 if (JVMCI_ONLY(_deopt_handler_entry_offset != -1 &&) pos == deopt_handler_entry()) label = "[Deopt Handler Entry Point]";
4035 return label;
4036 }
4037
4038 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
4039 if (print_section_labels) {
4040 const char* label = nmethod_section_label(block_begin);
4041 if (label != nullptr) {
4042 stream->bol();
4043 stream->print_cr("%s", label);
4044 }
4045 }
4046
4047 if (block_begin == entry_point()) {
4048 Method* m = method();
4049 if (m != nullptr) {
4050 stream->print(" # ");
4051 m->print_value_on(stream);
4052 stream->cr();
4053 }
4054 if (m != nullptr && !is_osr_method()) {
4055 ResourceMark rm;
4056 int sizeargs = m->size_of_parameters();
4057 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
4058 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
4059 {
4060 int sig_index = 0;
4061 if (!m->is_static())
4062 sig_bt[sig_index++] = T_OBJECT; // 'this'
4063 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
4064 BasicType t = ss.type();
4065 sig_bt[sig_index++] = t;
4066 if (type2size[t] == 2) {
4067 sig_bt[sig_index++] = T_VOID;
4068 } else {
4069 assert(type2size[t] == 1, "size is 1 or 2");
4070 }
4071 }
4072 assert(sig_index == sizeargs, "");
4073 }
4074 const char* spname = "sp"; // make arch-specific?
4075 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
4076 int stack_slot_offset = this->frame_size() * wordSize;
4077 int tab1 = 14, tab2 = 24;
4078 int sig_index = 0;
4079 int arg_index = (m->is_static() ? 0 : -1);
4080 bool did_old_sp = false;
4081 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
4082 bool at_this = (arg_index == -1);
4083 bool at_old_sp = false;
4084 BasicType t = (at_this ? T_OBJECT : ss.type());
4085 assert(t == sig_bt[sig_index], "sigs in sync");
4086 if (at_this)
4087 stream->print(" # this: ");
4088 else
4089 stream->print(" # parm%d: ", arg_index);
4090 stream->move_to(tab1);
4091 VMReg fst = regs[sig_index].first();
4092 VMReg snd = regs[sig_index].second();
4093 if (fst->is_reg()) {
4094 stream->print("%s", fst->name());
4095 if (snd->is_valid()) {
4096 stream->print(":%s", snd->name());
4097 }
4098 } else if (fst->is_stack()) {
4099 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
4100 if (offset == stack_slot_offset) at_old_sp = true;
4101 stream->print("[%s+0x%x]", spname, offset);
4102 } else {
4103 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
4104 }
4105 stream->print(" ");
4106 stream->move_to(tab2);
4107 stream->print("= ");
4108 if (at_this) {
4109 m->method_holder()->print_value_on(stream);
4110 } else {
4111 bool did_name = false;
4112 if (!at_this && ss.is_reference()) {
4113 Symbol* name = ss.as_symbol();
4114 name->print_value_on(stream);
4115 did_name = true;
4116 }
4117 if (!did_name)
4118 stream->print("%s", type2name(t));
4119 }
4120 if (at_old_sp) {
4121 stream->print(" (%s of caller)", spname);
4122 did_old_sp = true;
4123 }
4124 stream->cr();
4125 sig_index += type2size[t];
4126 arg_index += 1;
4127 if (!at_this) ss.next();
4128 }
4129 if (!did_old_sp) {
4130 stream->print(" # ");
4131 stream->move_to(tab1);
4132 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4133 stream->print(" (%s of caller)", spname);
4134 stream->cr();
4135 }
4136 }
4137 }
4138 }
4139
4140 // Returns whether this nmethod has code comments.
4141 bool nmethod::has_code_comment(address begin, address end) {
4142 // scopes?
4143 ScopeDesc* sd = scope_desc_in(begin, end);
4144 if (sd != nullptr) return true;
4145
4146 // relocations?
4147 const char* str = reloc_string_for(begin, end);
4148 if (str != nullptr) return true;
4149
4150 // implicit exceptions?
4151 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4152 if (cont_offset != 0) return true;
4153
4154 return false;
4155 }
4156
4157 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4158 ImplicitExceptionTable implicit_table(this);
4159 int pc_offset = (int)(begin - code_begin());
4160 int cont_offset = implicit_table.continuation_offset(pc_offset);
4161 bool oop_map_required = false;
4162 if (cont_offset != 0) {
4163 st->move_to(column, 6, 0);
4164 if (pc_offset == cont_offset) {
4165 st->print("; implicit exception: deoptimizes");
4166 oop_map_required = true;
4167 } else {
4168 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4169 }
4170 }
4171
4172 // Find an oopmap in (begin, end]. We use the odd half-closed
4173 // interval so that oop maps and scope descs which are tied to the
4174 // byte after a call are printed with the call itself. OopMaps
4175 // associated with implicit exceptions are printed with the implicit
4176 // instruction.
4177 address base = code_begin();
4178 ImmutableOopMapSet* oms = oop_maps();
4179 if (oms != nullptr) {
4180 for (int i = 0, imax = oms->count(); i < imax; i++) {
4181 const ImmutableOopMapPair* pair = oms->pair_at(i);
4182 const ImmutableOopMap* om = pair->get_from(oms);
4183 address pc = base + pair->pc_offset();
4184 if (pc >= begin) {
4185 #if INCLUDE_JVMCI
4186 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4187 #else
4188 bool is_implicit_deopt = false;
4189 #endif
4190 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4191 st->move_to(column, 6, 0);
4192 st->print("; ");
4193 om->print_on(st);
4194 oop_map_required = false;
4195 }
4196 }
4197 if (pc > end) {
4198 break;
4199 }
4200 }
4201 }
4202 assert(!oop_map_required, "missed oopmap");
4203
4204 Thread* thread = Thread::current();
4205
4206 // Print any debug info present at this pc.
4207 ScopeDesc* sd = scope_desc_in(begin, end);
4208 if (sd != nullptr) {
4209 st->move_to(column, 6, 0);
4210 if (sd->bci() == SynchronizationEntryBCI) {
4211 st->print(";*synchronization entry");
4212 } else if (sd->bci() == AfterBci) {
4213 st->print(";* method exit (unlocked if synchronized)");
4214 } else if (sd->bci() == UnwindBci) {
4215 st->print(";* unwind (locked if synchronized)");
4216 } else if (sd->bci() == AfterExceptionBci) {
4217 st->print(";* unwind (unlocked if synchronized)");
4218 } else if (sd->bci() == UnknownBci) {
4219 st->print(";* unknown");
4220 } else if (sd->bci() == InvalidFrameStateBci) {
4221 st->print(";* invalid frame state");
4222 } else {
4223 if (sd->method() == nullptr) {
4224 st->print("method is nullptr");
4225 } else if (sd->method()->is_native()) {
4226 st->print("method is native");
4227 } else {
4228 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4229 st->print(";*%s", Bytecodes::name(bc));
4230 switch (bc) {
4231 case Bytecodes::_invokevirtual:
4232 case Bytecodes::_invokespecial:
4233 case Bytecodes::_invokestatic:
4234 case Bytecodes::_invokeinterface:
4235 {
4236 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4237 st->print(" ");
4238 if (invoke.name() != nullptr)
4239 invoke.name()->print_symbol_on(st);
4240 else
4241 st->print("<UNKNOWN>");
4242 break;
4243 }
4244 case Bytecodes::_getfield:
4245 case Bytecodes::_putfield:
4246 case Bytecodes::_getstatic:
4247 case Bytecodes::_putstatic:
4248 {
4249 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4250 st->print(" ");
4251 if (field.name() != nullptr)
4252 field.name()->print_symbol_on(st);
4253 else
4254 st->print("<UNKNOWN>");
4255 }
4256 default:
4257 break;
4258 }
4259 }
4260 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4261 }
4262
4263 // Print all scopes
4264 for (;sd != nullptr; sd = sd->sender()) {
4265 st->move_to(column, 6, 0);
4266 st->print("; -");
4267 if (sd->should_reexecute()) {
4268 st->print(" (reexecute)");
4269 }
4270 if (sd->method() == nullptr) {
4271 st->print("method is nullptr");
4272 } else {
4273 sd->method()->print_short_name(st);
4274 }
4275 int lineno = sd->method()->line_number_from_bci(sd->bci());
4276 if (lineno != -1) {
4277 st->print("@%d (line %d)", sd->bci(), lineno);
4278 } else {
4279 st->print("@%d", sd->bci());
4280 }
4281 st->cr();
4282 }
4283 }
4284
4285 // Print relocation information
4286 // Prevent memory leak: allocating without ResourceMark.
4287 ResourceMark rm;
4288 const char* str = reloc_string_for(begin, end);
4289 if (str != nullptr) {
4290 if (sd != nullptr) st->cr();
4291 st->move_to(column, 6, 0);
4292 st->print("; {%s}", str);
4293 }
4294 }
4295
4296 #endif
4297
4298 address nmethod::call_instruction_address(address pc) const {
4299 if (NativeCall::is_call_before(pc)) {
4300 NativeCall *ncall = nativeCall_before(pc);
4301 return ncall->instruction_address();
4302 }
4303 return nullptr;
4304 }
4305
4306 void nmethod::print_value_on_impl(outputStream* st) const {
4307 st->print_cr("nmethod");
4308 #if defined(SUPPORT_DATA_STRUCTS)
4309 print_on_with_msg(st, nullptr);
4310 #endif
4311 }
4312
4313 void nmethod::print_code_snippet(outputStream* st, address addr) const {
4314 if (entry_point() <= addr && addr < code_end()) {
4315 // Pointing into the nmethod's code. Try to disassemble some instructions around addr.
4316 // Determine conservative start and end points.
4317 address start;
4318 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
4319 addr >= code_begin() + frame_complete_offset()) {
4320 start = code_begin() + frame_complete_offset();
4321 } else {
4322 start = (addr < verified_entry_point()) ? entry_point() : verified_entry_point();
4323 }
4324 address start_for_hex_dump = start; // We can choose a different starting point for hex dump, below.
4325 address end = code_end();
4326
4327 // Try using relocations to find closer instruction start and end points.
4328 // (Some platforms have variable length instructions and can only
4329 // disassemble correctly at instruction start addresses.)
4330 RelocIterator iter((nmethod*)this, start);
4331 while (iter.next() && iter.addr() < addr) { // find relocation before addr
4332 // Note: There's a relocation which doesn't point to an instruction start:
4333 // ZBarrierRelocationFormatStoreGoodAfterMov with ZGC on x86_64
4334 // We could detect and skip it, but hex dump is still usable when
4335 // disassembler produces garbage in such a very rare case.
4336 start = iter.addr();
4337 // We want at least 64 Bytes ahead in hex dump.
4338 if (iter.addr() <= (addr - 64)) start_for_hex_dump = iter.addr();
4339 }
4340 if (iter.has_current()) {
4341 if (iter.addr() == addr) iter.next(); // find relocation after addr
4342 if (iter.has_current()) end = iter.addr();
4343 }
4344
4345 // Always print hex. Disassembler may still have problems when hitting an incorrect instruction start.
4346 os::print_hex_dump(st, start_for_hex_dump, end, 1, /* print_ascii=*/false);
4347 if (!Disassembler::is_abstract()) {
4348 Disassembler::decode(start, end, st);
4349 }
4350 }
4351 }
4352
4353 #ifndef PRODUCT
4354
4355 void nmethod::print_calls(outputStream* st) {
4356 RelocIterator iter(this);
4357 while (iter.next()) {
4358 switch (iter.type()) {
4359 case relocInfo::virtual_call_type: {
4360 CompiledICLocker ml_verify(this);
4361 CompiledIC_at(&iter)->print();
4362 break;
4363 }
4364 case relocInfo::static_call_type:
4365 case relocInfo::opt_virtual_call_type:
4366 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4367 CompiledDirectCall::at(iter.reloc())->print();
4368 break;
4369 default:
4370 break;
4371 }
4372 }
4373 }
4374
4375 void nmethod::print_statistics() {
4376 ttyLocker ttyl;
4377 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4378 native_nmethod_stats.print_native_nmethod_stats();
4379 #ifdef COMPILER1
4380 c1_java_nmethod_stats.print_nmethod_stats("C1");
4381 #endif
4382 #ifdef COMPILER2
4383 c2_java_nmethod_stats.print_nmethod_stats("C2");
4384 #endif
4385 #if INCLUDE_JVMCI
4386 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4387 #endif
4388 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4389 DebugInformationRecorder::print_statistics();
4390 pc_nmethod_stats.print_pc_stats();
4391 Dependencies::print_statistics();
4392 ExternalsRecorder::print_statistics();
4393 if (xtty != nullptr) xtty->tail("statistics");
4394 }
4395
4396 #endif // !PRODUCT
4397
4398 #if INCLUDE_JVMCI
4399 void nmethod::update_speculation(JavaThread* thread) {
4400 jlong speculation = thread->pending_failed_speculation();
4401 if (speculation != 0) {
4402 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4403 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4404 thread->set_pending_failed_speculation(0);
4405 }
4406 }
4407
4408 const char* nmethod::jvmci_name() {
4409 if (jvmci_nmethod_data() != nullptr) {
4410 return jvmci_nmethod_data()->name();
4411 }
4412 return nullptr;
4413 }
4414
4415 bool nmethod::jvmci_skip_profile_deopt() const {
4416 return jvmci_nmethod_data() != nullptr && !jvmci_nmethod_data()->profile_deopt();
4417 }
4418 #endif