1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.inline.hpp"
26 #include "code/aotCodeCache.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.inline.hpp"
32 #include "code/relocInfo.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "compiler/abstractCompiler.hpp"
35 #include "compiler/compilationLog.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compileTask.hpp"
39 #include "compiler/compilerDirectives.hpp"
40 #include "compiler/compilerOracle.hpp"
41 #include "compiler/directivesParser.hpp"
42 #include "compiler/disassembler.hpp"
43 #include "compiler/oopMap.inline.hpp"
44 #include "gc/shared/barrierSet.hpp"
45 #include "gc/shared/barrierSetNMethod.hpp"
46 #include "gc/shared/classUnloadingContext.hpp"
47 #include "gc/shared/collectedHeap.hpp"
48 #include "interpreter/bytecode.inline.hpp"
49 #include "jvm.h"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "memory/allocation.inline.hpp"
53 #include "memory/resourceArea.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/access.inline.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/methodData.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/weakHandle.inline.hpp"
61 #include "prims/jvmtiImpl.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "prims/methodHandles.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/atomic.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/flags/flagSetting.hpp"
68 #include "runtime/frame.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/jniHandles.inline.hpp"
71 #include "runtime/orderAccess.hpp"
72 #include "runtime/os.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/serviceThread.hpp"
75 #include "runtime/sharedRuntime.hpp"
76 #include "runtime/signature.hpp"
77 #include "runtime/threadWXSetters.inline.hpp"
78 #include "runtime/vmThread.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/globalDefinitions.hpp"
84 #include "utilities/resourceHash.hpp"
85 #include "utilities/xmlstream.hpp"
86 #if INCLUDE_JVMCI
87 #include "jvmci/jvmciRuntime.hpp"
88 #endif
89
90 #ifdef DTRACE_ENABLED
91
92 // Only bother with this argument setup if dtrace is available
93
94 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
95 { \
96 Method* m = (method); \
97 if (m != nullptr) { \
98 Symbol* klass_name = m->klass_name(); \
99 Symbol* name = m->name(); \
100 Symbol* signature = m->signature(); \
101 HOTSPOT_COMPILED_METHOD_UNLOAD( \
102 (char *) klass_name->bytes(), klass_name->utf8_length(), \
103 (char *) name->bytes(), name->utf8_length(), \
104 (char *) signature->bytes(), signature->utf8_length()); \
105 } \
106 }
107
108 #else // ndef DTRACE_ENABLED
109
110 #define DTRACE_METHOD_UNLOAD_PROBE(method)
111
112 #endif
113
114 // Cast from int value to narrow type
115 #define CHECKED_CAST(result, T, thing) \
116 result = static_cast<T>(thing); \
117 guarantee(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing);
118
119 //---------------------------------------------------------------------------------
120 // NMethod statistics
121 // They are printed under various flags, including:
122 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
123 // (In the latter two cases, they like other stats are printed to the log only.)
124
125 #ifndef PRODUCT
126 // These variables are put into one block to reduce relocations
127 // and make it simpler to print from the debugger.
128 struct java_nmethod_stats_struct {
129 uint nmethod_count;
130 uint total_nm_size;
131 uint total_immut_size;
132 uint total_mut_size;
133 uint relocation_size;
134 uint consts_size;
135 uint insts_size;
136 uint stub_size;
137 uint oops_size;
138 uint metadata_size;
139 uint dependencies_size;
140 uint nul_chk_table_size;
141 uint handler_table_size;
142 uint scopes_pcs_size;
143 uint scopes_data_size;
144 #if INCLUDE_JVMCI
145 uint speculations_size;
146 uint jvmci_data_size;
147 #endif
148
149 void note_nmethod(nmethod* nm) {
150 nmethod_count += 1;
151 total_nm_size += nm->size();
152 total_immut_size += nm->immutable_data_size();
153 total_mut_size += nm->mutable_data_size();
154 relocation_size += nm->relocation_size();
155 consts_size += nm->consts_size();
156 insts_size += nm->insts_size();
157 stub_size += nm->stub_size();
158 oops_size += nm->oops_size();
159 metadata_size += nm->metadata_size();
160 scopes_data_size += nm->scopes_data_size();
161 scopes_pcs_size += nm->scopes_pcs_size();
162 dependencies_size += nm->dependencies_size();
163 handler_table_size += nm->handler_table_size();
164 nul_chk_table_size += nm->nul_chk_table_size();
165 #if INCLUDE_JVMCI
166 speculations_size += nm->speculations_size();
167 jvmci_data_size += nm->jvmci_data_size();
168 #endif
169 }
170 void print_nmethod_stats(const char* name) {
171 if (nmethod_count == 0) return;
172 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
173 uint total_size = total_nm_size + total_immut_size + total_mut_size;
174 if (total_nm_size != 0) {
175 tty->print_cr(" total size = %u (100%%)", total_size);
176 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
177 }
178 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
179 if (nmethod_count != 0) {
180 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
181 }
182 if (consts_size != 0) {
183 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
184 }
185 if (insts_size != 0) {
186 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
187 }
188 if (stub_size != 0) {
189 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
190 }
191 if (oops_size != 0) {
192 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
193 }
194 if (total_mut_size != 0) {
195 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
196 }
197 if (relocation_size != 0) {
198 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
199 }
200 if (metadata_size != 0) {
201 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
202 }
203 #if INCLUDE_JVMCI
204 if (jvmci_data_size != 0) {
205 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_mut_size);
206 }
207 #endif
208 if (total_immut_size != 0) {
209 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
210 }
211 if (dependencies_size != 0) {
212 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
213 }
214 if (nul_chk_table_size != 0) {
215 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
216 }
217 if (handler_table_size != 0) {
218 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
219 }
220 if (scopes_pcs_size != 0) {
221 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
222 }
223 if (scopes_data_size != 0) {
224 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
225 }
226 #if INCLUDE_JVMCI
227 if (speculations_size != 0) {
228 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size);
229 }
230 #endif
231 }
232 };
233
234 struct native_nmethod_stats_struct {
235 uint native_nmethod_count;
236 uint native_total_size;
237 uint native_relocation_size;
238 uint native_insts_size;
239 uint native_oops_size;
240 uint native_metadata_size;
241 void note_native_nmethod(nmethod* nm) {
242 native_nmethod_count += 1;
243 native_total_size += nm->size();
244 native_relocation_size += nm->relocation_size();
245 native_insts_size += nm->insts_size();
246 native_oops_size += nm->oops_size();
247 native_metadata_size += nm->metadata_size();
248 }
249 void print_native_nmethod_stats() {
250 if (native_nmethod_count == 0) return;
251 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
252 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
253 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
254 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
255 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
256 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
257 }
258 };
259
260 struct pc_nmethod_stats_struct {
261 uint pc_desc_init; // number of initialization of cache (= number of caches)
262 uint pc_desc_queries; // queries to nmethod::find_pc_desc
263 uint pc_desc_approx; // number of those which have approximate true
264 uint pc_desc_repeats; // number of _pc_descs[0] hits
265 uint pc_desc_hits; // number of LRU cache hits
266 uint pc_desc_tests; // total number of PcDesc examinations
267 uint pc_desc_searches; // total number of quasi-binary search steps
268 uint pc_desc_adds; // number of LUR cache insertions
269
270 void print_pc_stats() {
271 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
272 pc_desc_queries,
273 (double)(pc_desc_tests + pc_desc_searches)
274 / pc_desc_queries);
275 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
276 pc_desc_init,
277 pc_desc_queries, pc_desc_approx,
278 pc_desc_repeats, pc_desc_hits,
279 pc_desc_tests, pc_desc_searches, pc_desc_adds);
280 }
281 };
282
283 #ifdef COMPILER1
284 static java_nmethod_stats_struct c1_java_nmethod_stats;
285 #endif
286 #ifdef COMPILER2
287 static java_nmethod_stats_struct c2_java_nmethod_stats;
288 #endif
289 #if INCLUDE_JVMCI
290 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
291 #endif
292 static java_nmethod_stats_struct unknown_java_nmethod_stats;
293
294 static native_nmethod_stats_struct native_nmethod_stats;
295 static pc_nmethod_stats_struct pc_nmethod_stats;
296
297 static void note_java_nmethod(nmethod* nm) {
298 #ifdef COMPILER1
299 if (nm->is_compiled_by_c1()) {
300 c1_java_nmethod_stats.note_nmethod(nm);
301 } else
302 #endif
303 #ifdef COMPILER2
304 if (nm->is_compiled_by_c2()) {
305 c2_java_nmethod_stats.note_nmethod(nm);
306 } else
307 #endif
308 #if INCLUDE_JVMCI
309 if (nm->is_compiled_by_jvmci()) {
310 jvmci_java_nmethod_stats.note_nmethod(nm);
311 } else
312 #endif
313 {
314 unknown_java_nmethod_stats.note_nmethod(nm);
315 }
316 }
317 #endif // !PRODUCT
318
319 //---------------------------------------------------------------------------------
320
321
322 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
323 assert(pc != nullptr, "Must be non null");
324 assert(exception.not_null(), "Must be non null");
325 assert(handler != nullptr, "Must be non null");
326
327 _count = 0;
328 _exception_type = exception->klass();
329 _next = nullptr;
330 _purge_list_next = nullptr;
331
332 add_address_and_handler(pc,handler);
333 }
334
335
336 address ExceptionCache::match(Handle exception, address pc) {
337 assert(pc != nullptr,"Must be non null");
338 assert(exception.not_null(),"Must be non null");
339 if (exception->klass() == exception_type()) {
340 return (test_address(pc));
341 }
342
343 return nullptr;
344 }
345
346
347 bool ExceptionCache::match_exception_with_space(Handle exception) {
348 assert(exception.not_null(),"Must be non null");
349 if (exception->klass() == exception_type() && count() < cache_size) {
350 return true;
351 }
352 return false;
353 }
354
355
356 address ExceptionCache::test_address(address addr) {
357 int limit = count();
358 for (int i = 0; i < limit; i++) {
359 if (pc_at(i) == addr) {
360 return handler_at(i);
361 }
362 }
363 return nullptr;
364 }
365
366
367 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
368 if (test_address(addr) == handler) return true;
369
370 int index = count();
371 if (index < cache_size) {
372 set_pc_at(index, addr);
373 set_handler_at(index, handler);
374 increment_count();
375 return true;
376 }
377 return false;
378 }
379
380 ExceptionCache* ExceptionCache::next() {
381 return Atomic::load(&_next);
382 }
383
384 void ExceptionCache::set_next(ExceptionCache *ec) {
385 Atomic::store(&_next, ec);
386 }
387
388 //-----------------------------------------------------------------------------
389
390
391 // Helper used by both find_pc_desc methods.
392 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
393 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
394 if (!approximate) {
395 return pc->pc_offset() == pc_offset;
396 } else {
397 // Do not look before the sentinel
398 assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
399 return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
400 }
401 }
402
403 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
404 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
405 // initialize the cache by filling it with benign (non-null) values
406 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
407 "must start with a sentinel");
408 for (int i = 0; i < cache_size; i++) {
409 _pc_descs[i] = initial_pc_desc;
410 }
411 }
412
413 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
414 // Note: one might think that caching the most recently
415 // read value separately would be a win, but one would be
416 // wrong. When many threads are updating it, the cache
417 // line it's in would bounce between caches, negating
418 // any benefit.
419
420 // In order to prevent race conditions do not load cache elements
421 // repeatedly, but use a local copy:
422 PcDesc* res;
423
424 // Step one: Check the most recently added value.
425 res = _pc_descs[0];
426 assert(res != nullptr, "PcDesc cache should be initialized already");
427
428 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
429 if (approximate && match_desc(res, pc_offset, approximate)) {
430 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
431 return res;
432 }
433
434 // Step two: Check the rest of the LRU cache.
435 for (int i = 1; i < cache_size; ++i) {
436 res = _pc_descs[i];
437 if (res->pc_offset() < 0) break; // optimization: skip empty cache
438 if (match_desc(res, pc_offset, approximate)) {
439 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
440 return res;
441 }
442 }
443
444 // Report failure.
445 return nullptr;
446 }
447
448 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
449 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
450 // Update the LRU cache by shifting pc_desc forward.
451 for (int i = 0; i < cache_size; i++) {
452 PcDesc* next = _pc_descs[i];
453 _pc_descs[i] = pc_desc;
454 pc_desc = next;
455 }
456 }
457
458 // adjust pcs_size so that it is a multiple of both oopSize and
459 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
460 // of oopSize, then 2*sizeof(PcDesc) is)
461 static int adjust_pcs_size(int pcs_size) {
462 int nsize = align_up(pcs_size, oopSize);
463 if ((nsize % sizeof(PcDesc)) != 0) {
464 nsize = pcs_size + sizeof(PcDesc);
465 }
466 assert((nsize % oopSize) == 0, "correct alignment");
467 return nsize;
468 }
469
470 bool nmethod::is_method_handle_return(address return_pc) {
471 if (!has_method_handle_invokes()) return false;
472 PcDesc* pd = pc_desc_at(return_pc);
473 if (pd == nullptr)
474 return false;
475 return pd->is_method_handle_invoke();
476 }
477
478 // Returns a string version of the method state.
479 const char* nmethod::state() const {
480 int state = get_state();
481 switch (state) {
482 case not_installed:
483 return "not installed";
484 case in_use:
485 return "in use";
486 case not_entrant:
487 return "not_entrant";
488 default:
489 fatal("unexpected method state: %d", state);
490 return nullptr;
491 }
492 }
493
494 void nmethod::set_deoptimized_done() {
495 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
496 if (_deoptimization_status != deoptimize_done) { // can't go backwards
497 Atomic::store(&_deoptimization_status, deoptimize_done);
498 }
499 }
500
501 ExceptionCache* nmethod::exception_cache_acquire() const {
502 return Atomic::load_acquire(&_exception_cache);
503 }
504
505 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
506 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
507 assert(new_entry != nullptr,"Must be non null");
508 assert(new_entry->next() == nullptr, "Must be null");
509
510 for (;;) {
511 ExceptionCache *ec = exception_cache();
512 if (ec != nullptr) {
513 Klass* ex_klass = ec->exception_type();
514 if (!ex_klass->is_loader_alive()) {
515 // We must guarantee that entries are not inserted with new next pointer
516 // edges to ExceptionCache entries with dead klasses, due to bad interactions
517 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
518 // the head pointer forward to the first live ExceptionCache, so that the new
519 // next pointers always point at live ExceptionCaches, that are not removed due
520 // to concurrent ExceptionCache cleanup.
521 ExceptionCache* next = ec->next();
522 if (Atomic::cmpxchg(&_exception_cache, ec, next) == ec) {
523 CodeCache::release_exception_cache(ec);
524 }
525 continue;
526 }
527 ec = exception_cache();
528 if (ec != nullptr) {
529 new_entry->set_next(ec);
530 }
531 }
532 if (Atomic::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
533 return;
534 }
535 }
536 }
537
538 void nmethod::clean_exception_cache() {
539 // For each nmethod, only a single thread may call this cleanup function
540 // at the same time, whether called in STW cleanup or concurrent cleanup.
541 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
542 // then a single writer may contend with cleaning up the head pointer to the
543 // first ExceptionCache node that has a Klass* that is alive. That is fine,
544 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
545 // And the concurrent writers do not clean up next pointers, only the head.
546 // Also note that concurrent readers will walk through Klass* pointers that are not
547 // alive. That does not cause ABA problems, because Klass* is deleted after
548 // a handshake with all threads, after all stale ExceptionCaches have been
549 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
550 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
551 // That similarly implies that CAS operations on ExceptionCache entries do not
552 // suffer from ABA problems as unlinking and deletion is separated by a global
553 // handshake operation.
554 ExceptionCache* prev = nullptr;
555 ExceptionCache* curr = exception_cache_acquire();
556
557 while (curr != nullptr) {
558 ExceptionCache* next = curr->next();
559
560 if (!curr->exception_type()->is_loader_alive()) {
561 if (prev == nullptr) {
562 // Try to clean head; this is contended by concurrent inserts, that
563 // both lazily clean the head, and insert entries at the head. If
564 // the CAS fails, the operation is restarted.
565 if (Atomic::cmpxchg(&_exception_cache, curr, next) != curr) {
566 prev = nullptr;
567 curr = exception_cache_acquire();
568 continue;
569 }
570 } else {
571 // It is impossible to during cleanup connect the next pointer to
572 // an ExceptionCache that has not been published before a safepoint
573 // prior to the cleanup. Therefore, release is not required.
574 prev->set_next(next);
575 }
576 // prev stays the same.
577
578 CodeCache::release_exception_cache(curr);
579 } else {
580 prev = curr;
581 }
582
583 curr = next;
584 }
585 }
586
587 // public method for accessing the exception cache
588 // These are the public access methods.
589 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
590 // We never grab a lock to read the exception cache, so we may
591 // have false negatives. This is okay, as it can only happen during
592 // the first few exception lookups for a given nmethod.
593 ExceptionCache* ec = exception_cache_acquire();
594 while (ec != nullptr) {
595 address ret_val;
596 if ((ret_val = ec->match(exception,pc)) != nullptr) {
597 return ret_val;
598 }
599 ec = ec->next();
600 }
601 return nullptr;
602 }
603
604 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
605 // There are potential race conditions during exception cache updates, so we
606 // must own the ExceptionCache_lock before doing ANY modifications. Because
607 // we don't lock during reads, it is possible to have several threads attempt
608 // to update the cache with the same data. We need to check for already inserted
609 // copies of the current data before adding it.
610
611 MutexLocker ml(ExceptionCache_lock);
612 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
613
614 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
615 target_entry = new ExceptionCache(exception,pc,handler);
616 add_exception_cache_entry(target_entry);
617 }
618 }
619
620 // private method for handling exception cache
621 // These methods are private, and used to manipulate the exception cache
622 // directly.
623 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
624 ExceptionCache* ec = exception_cache_acquire();
625 while (ec != nullptr) {
626 if (ec->match_exception_with_space(exception)) {
627 return ec;
628 }
629 ec = ec->next();
630 }
631 return nullptr;
632 }
633
634 bool nmethod::is_at_poll_return(address pc) {
635 RelocIterator iter(this, pc, pc+1);
636 while (iter.next()) {
637 if (iter.type() == relocInfo::poll_return_type)
638 return true;
639 }
640 return false;
641 }
642
643
644 bool nmethod::is_at_poll_or_poll_return(address pc) {
645 RelocIterator iter(this, pc, pc+1);
646 while (iter.next()) {
647 relocInfo::relocType t = iter.type();
648 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
649 return true;
650 }
651 return false;
652 }
653
654 void nmethod::verify_oop_relocations() {
655 // Ensure sure that the code matches the current oop values
656 RelocIterator iter(this, nullptr, nullptr);
657 while (iter.next()) {
658 if (iter.type() == relocInfo::oop_type) {
659 oop_Relocation* reloc = iter.oop_reloc();
660 if (!reloc->oop_is_immediate()) {
661 reloc->verify_oop_relocation();
662 }
663 }
664 }
665 }
666
667
668 ScopeDesc* nmethod::scope_desc_at(address pc) {
669 PcDesc* pd = pc_desc_at(pc);
670 guarantee(pd != nullptr, "scope must be present");
671 return new ScopeDesc(this, pd);
672 }
673
674 ScopeDesc* nmethod::scope_desc_near(address pc) {
675 PcDesc* pd = pc_desc_near(pc);
676 guarantee(pd != nullptr, "scope must be present");
677 return new ScopeDesc(this, pd);
678 }
679
680 address nmethod::oops_reloc_begin() const {
681 // If the method is not entrant then a JMP is plastered over the
682 // first few bytes. If an oop in the old code was there, that oop
683 // should not get GC'd. Skip the first few bytes of oops on
684 // not-entrant methods.
685 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
686 code_begin() + frame_complete_offset() >
687 verified_entry_point() + NativeJump::instruction_size)
688 {
689 // If we have a frame_complete_offset after the native jump, then there
690 // is no point trying to look for oops before that. This is a requirement
691 // for being allowed to scan oops concurrently.
692 return code_begin() + frame_complete_offset();
693 }
694
695 address low_boundary = verified_entry_point();
696 if (!is_in_use()) {
697 low_boundary += NativeJump::instruction_size;
698 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
699 // This means that the low_boundary is going to be a little too high.
700 // This shouldn't matter, since oops of non-entrant methods are never used.
701 // In fact, why are we bothering to look at oops in a non-entrant method??
702 }
703 return low_boundary;
704 }
705
706 // Method that knows how to preserve outgoing arguments at call. This method must be
707 // called with a frame corresponding to a Java invoke
708 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
709 if (method() == nullptr) {
710 return;
711 }
712
713 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
714 JavaThread* thread = reg_map->thread();
715 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
716 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
717 return;
718 }
719
720 if (!method()->is_native()) {
721 address pc = fr.pc();
722 bool has_receiver, has_appendix;
723 Symbol* signature;
724
725 // The method attached by JIT-compilers should be used, if present.
726 // Bytecode can be inaccurate in such case.
727 Method* callee = attached_method_before_pc(pc);
728 if (callee != nullptr) {
729 has_receiver = !(callee->access_flags().is_static());
730 has_appendix = false;
731 signature = callee->signature();
732 } else {
733 SimpleScopeDesc ssd(this, pc);
734
735 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
736 has_receiver = call.has_receiver();
737 has_appendix = call.has_appendix();
738 signature = call.signature();
739 }
740
741 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
742 } else if (method()->is_continuation_enter_intrinsic()) {
743 // This method only calls Continuation.enter()
744 Symbol* signature = vmSymbols::continuationEnter_signature();
745 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
746 }
747 }
748
749 Method* nmethod::attached_method(address call_instr) {
750 assert(code_contains(call_instr), "not part of the nmethod");
751 RelocIterator iter(this, call_instr, call_instr + 1);
752 while (iter.next()) {
753 if (iter.addr() == call_instr) {
754 switch(iter.type()) {
755 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
756 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
757 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
758 default: break;
759 }
760 }
761 }
762 return nullptr; // not found
763 }
764
765 Method* nmethod::attached_method_before_pc(address pc) {
766 if (NativeCall::is_call_before(pc)) {
767 NativeCall* ncall = nativeCall_before(pc);
768 return attached_method(ncall->instruction_address());
769 }
770 return nullptr; // not a call
771 }
772
773 void nmethod::clear_inline_caches() {
774 assert(SafepointSynchronize::is_at_safepoint(), "clearing of IC's only allowed at safepoint");
775 RelocIterator iter(this);
776 while (iter.next()) {
777 iter.reloc()->clear_inline_cache();
778 }
779 }
780
781 #ifdef ASSERT
782 // Check class_loader is alive for this bit of metadata.
783 class CheckClass : public MetadataClosure {
784 void do_metadata(Metadata* md) {
785 Klass* klass = nullptr;
786 if (md->is_klass()) {
787 klass = ((Klass*)md);
788 } else if (md->is_method()) {
789 klass = ((Method*)md)->method_holder();
790 } else if (md->is_methodData()) {
791 klass = ((MethodData*)md)->method()->method_holder();
792 } else if (md->is_methodCounters()) {
793 klass = ((MethodCounters*)md)->method()->method_holder();
794 } else {
795 md->print();
796 ShouldNotReachHere();
797 }
798 assert(klass->is_loader_alive(), "must be alive");
799 }
800 };
801 #endif // ASSERT
802
803
804 static void clean_ic_if_metadata_is_dead(CompiledIC *ic) {
805 ic->clean_metadata();
806 }
807
808 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
809 template <typename CallsiteT>
810 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, nmethod* from,
811 bool clean_all) {
812 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
813 if (!cb->is_nmethod()) {
814 return;
815 }
816 nmethod* nm = cb->as_nmethod();
817 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
818 callsite->set_to_clean();
819 }
820 }
821
822 // Cleans caches in nmethods that point to either classes that are unloaded
823 // or nmethods that are unloaded.
824 //
825 // Can be called either in parallel by G1 currently or after all
826 // nmethods are unloaded. Return postponed=true in the parallel case for
827 // inline caches found that point to nmethods that are not yet visited during
828 // the do_unloading walk.
829 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
830 ResourceMark rm;
831
832 // Exception cache only needs to be called if unloading occurred
833 if (unloading_occurred) {
834 clean_exception_cache();
835 }
836
837 cleanup_inline_caches_impl(unloading_occurred, false);
838
839 #ifdef ASSERT
840 // Check that the metadata embedded in the nmethod is alive
841 CheckClass check_class;
842 metadata_do(&check_class);
843 #endif
844 }
845
846 void nmethod::run_nmethod_entry_barrier() {
847 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
848 if (bs_nm != nullptr) {
849 // We want to keep an invariant that nmethods found through iterations of a Thread's
850 // nmethods found in safepoints have gone through an entry barrier and are not armed.
851 // By calling this nmethod entry barrier, it plays along and acts
852 // like any other nmethod found on the stack of a thread (fewer surprises).
853 nmethod* nm = this;
854 bool alive = bs_nm->nmethod_entry_barrier(nm);
855 assert(alive, "should be alive");
856 }
857 }
858
859 // Only called by whitebox test
860 void nmethod::cleanup_inline_caches_whitebox() {
861 assert_locked_or_safepoint(CodeCache_lock);
862 CompiledICLocker ic_locker(this);
863 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
864 }
865
866 address* nmethod::orig_pc_addr(const frame* fr) {
867 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
868 }
869
870 // Called to clean up after class unloading for live nmethods
871 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
872 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
873 ResourceMark rm;
874
875 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
876 RelocIterator iter(this, oops_reloc_begin());
877 bool is_in_static_stub = false;
878 while(iter.next()) {
879
880 switch (iter.type()) {
881
882 case relocInfo::virtual_call_type:
883 if (unloading_occurred) {
884 // If class unloading occurred we first clear ICs where the cached metadata
885 // is referring to an unloaded klass or method.
886 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter));
887 }
888
889 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, clean_all);
890 break;
891
892 case relocInfo::opt_virtual_call_type:
893 case relocInfo::static_call_type:
894 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), this, clean_all);
895 break;
896
897 case relocInfo::static_stub_type: {
898 is_in_static_stub = true;
899 break;
900 }
901
902 case relocInfo::metadata_type: {
903 // Only the metadata relocations contained in static/opt virtual call stubs
904 // contains the Method* passed to c2i adapters. It is the only metadata
905 // relocation that needs to be walked, as it is the one metadata relocation
906 // that violates the invariant that all metadata relocations have an oop
907 // in the compiled method (due to deferred resolution and code patching).
908
909 // This causes dead metadata to remain in compiled methods that are not
910 // unloading. Unless these slippery metadata relocations of the static
911 // stubs are at least cleared, subsequent class redefinition operations
912 // will access potentially free memory, and JavaThread execution
913 // concurrent to class unloading may call c2i adapters with dead methods.
914 if (!is_in_static_stub) {
915 // The first metadata relocation after a static stub relocation is the
916 // metadata relocation of the static stub used to pass the Method* to
917 // c2i adapters.
918 continue;
919 }
920 is_in_static_stub = false;
921 if (is_unloading()) {
922 // If the nmethod itself is dying, then it may point at dead metadata.
923 // Nobody should follow that metadata; it is strictly unsafe.
924 continue;
925 }
926 metadata_Relocation* r = iter.metadata_reloc();
927 Metadata* md = r->metadata_value();
928 if (md != nullptr && md->is_method()) {
929 Method* method = static_cast<Method*>(md);
930 if (!method->method_holder()->is_loader_alive()) {
931 Atomic::store(r->metadata_addr(), (Method*)nullptr);
932
933 if (!r->metadata_is_immediate()) {
934 r->fix_metadata_relocation();
935 }
936 }
937 }
938 break;
939 }
940
941 default:
942 break;
943 }
944 }
945 }
946
947 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
948 // Exception happened outside inline-cache check code => we are inside
949 // an active nmethod => use cpc to determine a return address
950 int exception_offset = int(pc - code_begin());
951 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
952 #ifdef ASSERT
953 if (cont_offset == 0) {
954 Thread* thread = Thread::current();
955 ResourceMark rm(thread);
956 CodeBlob* cb = CodeCache::find_blob(pc);
957 assert(cb != nullptr && cb == this, "");
958
959 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
960 stringStream ss;
961 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
962 print_on(&ss);
963 method()->print_codes_on(&ss);
964 print_code_on(&ss);
965 print_pcs_on(&ss);
966 tty->print("%s", ss.as_string()); // print all at once
967 }
968 #endif
969 if (cont_offset == 0) {
970 // Let the normal error handling report the exception
971 return nullptr;
972 }
973 if (cont_offset == exception_offset) {
974 #if INCLUDE_JVMCI
975 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
976 JavaThread *thread = JavaThread::current();
977 thread->set_jvmci_implicit_exception_pc(pc);
978 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
979 Deoptimization::Action_reinterpret));
980 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
981 #else
982 ShouldNotReachHere();
983 #endif
984 }
985 return code_begin() + cont_offset;
986 }
987
988 class HasEvolDependency : public MetadataClosure {
989 bool _has_evol_dependency;
990 public:
991 HasEvolDependency() : _has_evol_dependency(false) {}
992 void do_metadata(Metadata* md) {
993 if (md->is_method()) {
994 Method* method = (Method*)md;
995 if (method->is_old()) {
996 _has_evol_dependency = true;
997 }
998 }
999 }
1000 bool has_evol_dependency() const { return _has_evol_dependency; }
1001 };
1002
1003 bool nmethod::has_evol_metadata() {
1004 // Check the metadata in relocIter and CompiledIC and also deoptimize
1005 // any nmethod that has reference to old methods.
1006 HasEvolDependency check_evol;
1007 metadata_do(&check_evol);
1008 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
1009 ResourceMark rm;
1010 log_debug(redefine, class, nmethod)
1011 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
1012 _method->method_holder()->external_name(),
1013 _method->name()->as_C_string(),
1014 _method->signature()->as_C_string(),
1015 compile_id());
1016 }
1017 return check_evol.has_evol_dependency();
1018 }
1019
1020 int nmethod::total_size() const {
1021 return
1022 consts_size() +
1023 insts_size() +
1024 stub_size() +
1025 scopes_data_size() +
1026 scopes_pcs_size() +
1027 handler_table_size() +
1028 nul_chk_table_size();
1029 }
1030
1031 const char* nmethod::compile_kind() const {
1032 if (is_osr_method()) return "osr";
1033 if (method() != nullptr && is_native_method()) {
1034 if (method()->is_continuation_native_intrinsic()) {
1035 return "cnt";
1036 }
1037 return "c2n";
1038 }
1039 return nullptr;
1040 }
1041
1042 const char* nmethod::compiler_name() const {
1043 return compilertype2name(_compiler_type);
1044 }
1045
1046 #ifdef ASSERT
1047 class CheckForOopsClosure : public OopClosure {
1048 bool _found_oop = false;
1049 public:
1050 virtual void do_oop(oop* o) { _found_oop = true; }
1051 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1052 bool found_oop() { return _found_oop; }
1053 };
1054 class CheckForMetadataClosure : public MetadataClosure {
1055 bool _found_metadata = false;
1056 Metadata* _ignore = nullptr;
1057 public:
1058 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1059 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1060 bool found_metadata() { return _found_metadata; }
1061 };
1062
1063 static void assert_no_oops_or_metadata(nmethod* nm) {
1064 if (nm == nullptr) return;
1065 assert(nm->oop_maps() == nullptr, "expectation");
1066
1067 CheckForOopsClosure cfo;
1068 nm->oops_do(&cfo);
1069 assert(!cfo.found_oop(), "no oops allowed");
1070
1071 // We allow an exception for the own Method, but require its class to be permanent.
1072 Method* own_method = nm->method();
1073 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1074 nm->metadata_do(&cfm);
1075 assert(!cfm.found_metadata(), "no metadata allowed");
1076
1077 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1078 "Method's class needs to be permanent");
1079 }
1080 #endif
1081
1082 static int required_mutable_data_size(CodeBuffer* code_buffer,
1083 int jvmci_data_size = 0) {
1084 return align_up(code_buffer->total_relocation_size(), oopSize) +
1085 align_up(code_buffer->total_metadata_size(), oopSize) +
1086 align_up(jvmci_data_size, oopSize);
1087 }
1088
1089 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1090 int compile_id,
1091 CodeBuffer *code_buffer,
1092 int vep_offset,
1093 int frame_complete,
1094 int frame_size,
1095 ByteSize basic_lock_owner_sp_offset,
1096 ByteSize basic_lock_sp_offset,
1097 OopMapSet* oop_maps,
1098 int exception_handler) {
1099 code_buffer->finalize_oop_references(method);
1100 // create nmethod
1101 nmethod* nm = nullptr;
1102 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1103 {
1104 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1105
1106 CodeOffsets offsets;
1107 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1108 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1109 if (exception_handler != -1) {
1110 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1111 }
1112
1113 int mutable_data_size = required_mutable_data_size(code_buffer);
1114
1115 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1116 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1117 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1118 nm = new (native_nmethod_size, allow_NonNMethod_space)
1119 nmethod(method(), compiler_none, native_nmethod_size,
1120 compile_id, &offsets,
1121 code_buffer, frame_size,
1122 basic_lock_owner_sp_offset,
1123 basic_lock_sp_offset,
1124 oop_maps, mutable_data_size);
1125 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1126 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1127 }
1128
1129 if (nm != nullptr) {
1130 // verify nmethod
1131 DEBUG_ONLY(nm->verify();) // might block
1132
1133 nm->log_new_nmethod();
1134 }
1135 return nm;
1136 }
1137
1138 void nmethod::record_nmethod_dependency() {
1139 // To make dependency checking during class loading fast, record
1140 // the nmethod dependencies in the classes it is dependent on.
1141 // This allows the dependency checking code to simply walk the
1142 // class hierarchy above the loaded class, checking only nmethods
1143 // which are dependent on those classes. The slow way is to
1144 // check every nmethod for dependencies which makes it linear in
1145 // the number of methods compiled. For applications with a lot
1146 // classes the slow way is too slow.
1147 for (Dependencies::DepStream deps(this); deps.next(); ) {
1148 if (deps.type() == Dependencies::call_site_target_value) {
1149 // CallSite dependencies are managed on per-CallSite instance basis.
1150 oop call_site = deps.argument_oop(0);
1151 MethodHandles::add_dependent_nmethod(call_site, this);
1152 } else {
1153 InstanceKlass* ik = deps.context_type();
1154 if (ik == nullptr) {
1155 continue; // ignore things like evol_method
1156 }
1157 // record this nmethod as dependent on this klass
1158 ik->add_dependent_nmethod(this);
1159 }
1160 }
1161 }
1162
1163 nmethod* nmethod::new_nmethod(const methodHandle& method,
1164 int compile_id,
1165 int entry_bci,
1166 CodeOffsets* offsets,
1167 int orig_pc_offset,
1168 DebugInformationRecorder* debug_info,
1169 Dependencies* dependencies,
1170 CodeBuffer* code_buffer, int frame_size,
1171 OopMapSet* oop_maps,
1172 ExceptionHandlerTable* handler_table,
1173 ImplicitExceptionTable* nul_chk_table,
1174 AbstractCompiler* compiler,
1175 CompLevel comp_level
1176 , AOTCodeEntry* aot_code_entry
1177 #if INCLUDE_JVMCI
1178 , char* speculations,
1179 int speculations_len,
1180 JVMCINMethodData* jvmci_data
1181 #endif
1182 )
1183 {
1184 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1185 code_buffer->finalize_oop_references(method);
1186 // create nmethod
1187 nmethod* nm = nullptr;
1188 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1189
1190 int immutable_data_size =
1191 adjust_pcs_size(debug_info->pcs_size())
1192 + align_up((int)dependencies->size_in_bytes(), oopSize)
1193 + align_up(handler_table->size_in_bytes() , oopSize)
1194 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1195 #if INCLUDE_JVMCI
1196 + align_up(speculations_len , oopSize)
1197 #endif
1198 + align_up(debug_info->data_size() , oopSize);
1199
1200 // First, allocate space for immutable data in C heap.
1201 address immutable_data = nullptr;
1202 if (immutable_data_size > 0) {
1203 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1204 if (immutable_data == nullptr) {
1205 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1206 return nullptr;
1207 }
1208 }
1209
1210 int mutable_data_size = required_mutable_data_size(code_buffer
1211 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1212
1213 {
1214 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1215
1216 nm = new (nmethod_size, comp_level)
1217 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1218 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1219 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1220 handler_table, nul_chk_table, compiler, comp_level, aot_code_entry
1221 #if INCLUDE_JVMCI
1222 , speculations,
1223 speculations_len,
1224 jvmci_data
1225 #endif
1226 );
1227
1228 if (nm != nullptr) {
1229 nm->record_nmethod_dependency();
1230 NOT_PRODUCT(note_java_nmethod(nm));
1231 }
1232 }
1233 // Do verification and logging outside CodeCache_lock.
1234 if (nm != nullptr) {
1235
1236 #ifdef ASSERT
1237 LogTarget(Debug, aot, codecache, nmethod) log;
1238 if (log.is_enabled()) {
1239 LogStream out(log);
1240 out.print_cr("== new_nmethod 2");
1241 FlagSetting fs(PrintRelocations, true);
1242 nm->print_on_impl(&out);
1243 nm->decode(&out);
1244 }
1245 #endif
1246
1247 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1248 DEBUG_ONLY(nm->verify();)
1249 nm->log_new_nmethod();
1250 }
1251 return nm;
1252 }
1253
1254 nmethod* nmethod::restore(address code_cache_buffer,
1255 const methodHandle& method,
1256 int compile_id,
1257 address reloc_data,
1258 GrowableArray<Handle>& oop_list,
1259 GrowableArray<Metadata*>& metadata_list,
1260 ImmutableOopMapSet* oop_maps,
1261 address immutable_data,
1262 GrowableArray<Handle>& reloc_imm_oop_list,
1263 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1264 AOTCodeReader* aot_code_reader)
1265 {
1266 CodeBlob::restore(code_cache_buffer, "nmethod", reloc_data, oop_maps);
1267 nmethod* nm = (nmethod*)code_cache_buffer;
1268 nm->set_method(method());
1269 nm->_compile_id = compile_id;
1270 nm->set_immutable_data(immutable_data);
1271 nm->copy_values(&oop_list);
1272 nm->copy_values(&metadata_list);
1273
1274 aot_code_reader->fix_relocations(nm, &reloc_imm_oop_list, &reloc_imm_metadata_list);
1275
1276 #ifndef PRODUCT
1277 nm->asm_remarks().init();
1278 aot_code_reader->read_asm_remarks(nm->asm_remarks(), /* use_string_table */ false);
1279 nm->dbg_strings().init();
1280 aot_code_reader->read_dbg_strings(nm->dbg_strings(), /* use_string_table */ false);
1281 #endif
1282
1283 // Flush the code block
1284 ICache::invalidate_range(nm->code_begin(), nm->code_size());
1285
1286 // Create cache after PcDesc data is copied - it will be used to initialize cache
1287 nm->_pc_desc_container = new PcDescContainer(nm->scopes_pcs_begin());
1288
1289 nm->set_aot_code_entry(aot_code_reader->aot_code_entry());
1290
1291 nm->post_init();
1292 return nm;
1293 }
1294
1295 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1296 const methodHandle& method,
1297 AbstractCompiler* compiler,
1298 int compile_id,
1299 address reloc_data,
1300 GrowableArray<Handle>& oop_list,
1301 GrowableArray<Metadata*>& metadata_list,
1302 ImmutableOopMapSet* oop_maps,
1303 address immutable_data,
1304 GrowableArray<Handle>& reloc_imm_oop_list,
1305 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1306 AOTCodeReader* aot_code_reader)
1307 {
1308 nmethod* nm = nullptr;
1309 int nmethod_size = archived_nm->size();
1310 // create nmethod
1311 {
1312 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1313 address code_cache_buffer = (address)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1314 if (code_cache_buffer != nullptr) {
1315 nm = archived_nm->restore(code_cache_buffer,
1316 method,
1317 compile_id,
1318 reloc_data,
1319 oop_list,
1320 metadata_list,
1321 oop_maps,
1322 immutable_data,
1323 reloc_imm_oop_list,
1324 reloc_imm_metadata_list,
1325 aot_code_reader);
1326 nm->record_nmethod_dependency();
1327 NOT_PRODUCT(note_java_nmethod(nm));
1328 }
1329 }
1330 // Do verification and logging outside CodeCache_lock.
1331 if (nm != nullptr) {
1332 #ifdef ASSERT
1333 LogTarget(Debug, aot, codecache, nmethod) log;
1334 if (log.is_enabled()) {
1335 LogStream out(log);
1336 out.print_cr("== new_nmethod 2");
1337 FlagSetting fs(PrintRelocations, true);
1338 nm->print_on_impl(&out);
1339 nm->decode(&out);
1340 }
1341 #endif
1342 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1343 DEBUG_ONLY(nm->verify();)
1344 nm->log_new_nmethod();
1345 }
1346 return nm;
1347 }
1348
1349 // Fill in default values for various fields
1350 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1351 // avoid uninitialized fields, even for short time periods
1352 _exception_cache = nullptr;
1353 _gc_data = nullptr;
1354 _oops_do_mark_link = nullptr;
1355 _compiled_ic_data = nullptr;
1356
1357 _is_unloading_state = 0;
1358 _state = not_installed;
1359
1360 _has_unsafe_access = 0;
1361 _has_method_handle_invokes = 0;
1362 _has_wide_vectors = 0;
1363 _has_monitors = 0;
1364 _has_scoped_access = 0;
1365 _has_flushed_dependencies = 0;
1366 _is_unlinked = 0;
1367 _load_reported = 0; // jvmti state
1368 _preloaded = 0;
1369 _has_clinit_barriers = 0;
1370
1371 _used = false;
1372 _deoptimization_status = not_marked;
1373
1374 // SECT_CONSTS is first in code buffer so the offset should be 0.
1375 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1376 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1377
1378 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1379
1380 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1381 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1382
1383 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1384 }
1385
1386 // Post initialization
1387 void nmethod::post_init() {
1388 clear_unloading_state();
1389
1390 finalize_relocations();
1391
1392 Universe::heap()->register_nmethod(this);
1393 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1394
1395 CodeCache::commit(this);
1396 }
1397
1398 // For native wrappers
1399 nmethod::nmethod(
1400 Method* method,
1401 CompilerType type,
1402 int nmethod_size,
1403 int compile_id,
1404 CodeOffsets* offsets,
1405 CodeBuffer* code_buffer,
1406 int frame_size,
1407 ByteSize basic_lock_owner_sp_offset,
1408 ByteSize basic_lock_sp_offset,
1409 OopMapSet* oop_maps,
1410 int mutable_data_size)
1411 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1412 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1413 _deoptimization_generation(0),
1414 _gc_epoch(CodeCache::gc_epoch()),
1415 _method(method),
1416 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1417 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1418 {
1419 {
1420 DEBUG_ONLY(NoSafepointVerifier nsv;)
1421 assert_locked_or_safepoint(CodeCache_lock);
1422
1423 init_defaults(code_buffer, offsets);
1424
1425 _osr_entry_point = nullptr;
1426 _pc_desc_container = nullptr;
1427 _entry_bci = InvocationEntryBci;
1428 _compile_id = compile_id;
1429 _comp_level = CompLevel_none;
1430 _compiler_type = type;
1431 _orig_pc_offset = 0;
1432 _num_stack_arg_slots = 0;
1433
1434 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1435 // Continuation enter intrinsic
1436 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1437 } else {
1438 _exception_offset = 0;
1439 }
1440 // Native wrappers do not have deopt handlers. Make the values
1441 // something that will never match a pc like the nmethod vtable entry
1442 _deopt_handler_offset = 0;
1443 _deopt_mh_handler_offset = 0;
1444 _aot_code_entry = nullptr;
1445 _method_profiling_count = 0;
1446 _unwind_handler_offset = 0;
1447
1448 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1449 uint16_t metadata_size;
1450 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1451 JVMCI_ONLY( _metadata_size = metadata_size; )
1452 assert(_mutable_data_size == _relocation_size + metadata_size,
1453 "wrong mutable data size: %d != %d + %d",
1454 _mutable_data_size, _relocation_size, metadata_size);
1455
1456 // native wrapper does not have read-only data but we need unique not null address
1457 _immutable_data = blob_end();
1458 _immutable_data_size = 0;
1459 _nul_chk_table_offset = 0;
1460 _handler_table_offset = 0;
1461 _scopes_pcs_offset = 0;
1462 _scopes_data_offset = 0;
1463 #if INCLUDE_JVMCI
1464 _speculations_offset = 0;
1465 #endif
1466
1467 code_buffer->copy_code_and_locs_to(this);
1468 code_buffer->copy_values_to(this);
1469
1470 post_init();
1471 }
1472
1473 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1474 ttyLocker ttyl; // keep the following output all in one block
1475 // This output goes directly to the tty, not the compiler log.
1476 // To enable tools to match it up with the compilation activity,
1477 // be sure to tag this tty output with the compile ID.
1478 if (xtty != nullptr) {
1479 xtty->begin_head("print_native_nmethod");
1480 xtty->method(_method);
1481 xtty->stamp();
1482 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1483 }
1484 // Print the header part, then print the requested information.
1485 // This is both handled in decode2(), called via print_code() -> decode()
1486 if (PrintNativeNMethods) {
1487 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1488 print_code();
1489 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1490 #if defined(SUPPORT_DATA_STRUCTS)
1491 if (AbstractDisassembler::show_structs()) {
1492 if (oop_maps != nullptr) {
1493 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1494 oop_maps->print_on(tty);
1495 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1496 }
1497 }
1498 #endif
1499 } else {
1500 print(); // print the header part only.
1501 }
1502 #if defined(SUPPORT_DATA_STRUCTS)
1503 if (AbstractDisassembler::show_structs()) {
1504 if (PrintRelocations) {
1505 print_relocations_on(tty);
1506 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1507 }
1508 }
1509 #endif
1510 if (xtty != nullptr) {
1511 xtty->tail("print_native_nmethod");
1512 }
1513 }
1514 }
1515
1516 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1517 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1518 }
1519
1520 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1521 // Try MethodNonProfiled and MethodProfiled.
1522 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1523 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1524 // Try NonNMethod or give up.
1525 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1526 }
1527
1528 // For normal JIT compiled code
1529 nmethod::nmethod(
1530 Method* method,
1531 CompilerType type,
1532 int nmethod_size,
1533 int immutable_data_size,
1534 int mutable_data_size,
1535 int compile_id,
1536 int entry_bci,
1537 address immutable_data,
1538 CodeOffsets* offsets,
1539 int orig_pc_offset,
1540 DebugInformationRecorder* debug_info,
1541 Dependencies* dependencies,
1542 CodeBuffer *code_buffer,
1543 int frame_size,
1544 OopMapSet* oop_maps,
1545 ExceptionHandlerTable* handler_table,
1546 ImplicitExceptionTable* nul_chk_table,
1547 AbstractCompiler* compiler,
1548 CompLevel comp_level
1549 , AOTCodeEntry* aot_code_entry
1550 #if INCLUDE_JVMCI
1551 , char* speculations,
1552 int speculations_len,
1553 JVMCINMethodData* jvmci_data
1554 #endif
1555 )
1556 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1557 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1558 _deoptimization_generation(0),
1559 _gc_epoch(CodeCache::gc_epoch()),
1560 _method(method),
1561 _osr_link(nullptr)
1562 {
1563 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1564 {
1565 DEBUG_ONLY(NoSafepointVerifier nsv;)
1566 assert_locked_or_safepoint(CodeCache_lock);
1567
1568 init_defaults(code_buffer, offsets);
1569 _aot_code_entry = aot_code_entry;
1570 _method_profiling_count = 0;
1571
1572 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1573 _entry_bci = entry_bci;
1574 _compile_id = compile_id;
1575 _comp_level = comp_level;
1576 _compiler_type = type;
1577 _orig_pc_offset = orig_pc_offset;
1578
1579 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1580
1581 set_ctable_begin(header_begin() + content_offset());
1582
1583 #if INCLUDE_JVMCI
1584 if (compiler->is_jvmci()) {
1585 // JVMCI might not produce any stub sections
1586 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1587 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1588 } else {
1589 _exception_offset = -1;
1590 }
1591 if (offsets->value(CodeOffsets::Deopt) != -1) {
1592 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1593 } else {
1594 _deopt_handler_offset = -1;
1595 }
1596 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1597 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
1598 } else {
1599 _deopt_mh_handler_offset = -1;
1600 }
1601 } else
1602 #endif
1603 {
1604 // Exception handler and deopt handler are in the stub section
1605 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1606 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1607
1608 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1609 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1610 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1611 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
1612 } else {
1613 _deopt_mh_handler_offset = -1;
1614 }
1615 }
1616 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1617 // C1 generates UnwindHandler at the end of instructions section.
1618 // Calculate positive offset as distance between the start of stubs section
1619 // (which is also the end of instructions section) and the start of the handler.
1620 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1621 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1622 } else {
1623 _unwind_handler_offset = -1;
1624 }
1625
1626 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1627 uint16_t metadata_size;
1628 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1629 JVMCI_ONLY( _metadata_size = metadata_size; )
1630 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1631 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1632 "wrong mutable data size: %d != %d + %d + %d",
1633 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1634 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1635 nmethod_size, (int)(code_end() - header_begin()));
1636
1637 _immutable_data_size = immutable_data_size;
1638 if (immutable_data_size > 0) {
1639 assert(immutable_data != nullptr, "required");
1640 _immutable_data = immutable_data;
1641 } else {
1642 // We need unique not null address
1643 _immutable_data = blob_end();
1644 }
1645 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1646 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1647 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1648 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1649
1650 #if INCLUDE_JVMCI
1651 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1652 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); )
1653 #else
1654 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); )
1655 #endif
1656 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1657 immutable_data_end_offset, immutable_data_size);
1658
1659 // Copy code and relocation info
1660 code_buffer->copy_code_and_locs_to(this);
1661 // Copy oops and metadata
1662 code_buffer->copy_values_to(this);
1663 dependencies->copy_to(this);
1664 // Copy PcDesc and ScopeDesc data
1665 debug_info->copy_to(this);
1666
1667 // Create cache after PcDesc data is copied - it will be used to initialize cache
1668 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1669
1670 #if INCLUDE_JVMCI
1671 if (compiler->is_jvmci()) {
1672 // Initialize the JVMCINMethodData object inlined into nm
1673 jvmci_nmethod_data()->copy(jvmci_data);
1674 }
1675 #endif
1676
1677 // Copy contents of ExceptionHandlerTable to nmethod
1678 handler_table->copy_to(this);
1679 nul_chk_table->copy_to(this);
1680
1681 #if INCLUDE_JVMCI
1682 // Copy speculations to nmethod
1683 if (speculations_size() != 0) {
1684 memcpy(speculations_begin(), speculations, speculations_len);
1685 }
1686 #endif
1687
1688 post_init();
1689
1690 // we use the information of entry points to find out if a method is
1691 // static or non static
1692 assert(compiler->is_c2() || compiler->is_jvmci() ||
1693 _method->is_static() == (entry_point() == verified_entry_point()),
1694 " entry points must be same for static methods and vice versa");
1695 }
1696 }
1697
1698 // Print a short set of xml attributes to identify this nmethod. The
1699 // output should be embedded in some other element.
1700 void nmethod::log_identity(xmlStream* log) const {
1701 assert(log->inside_attrs_or_error(), "printing attributes");
1702 log->print(" code_compile_id='%d'", compile_id());
1703 const char* nm_kind = compile_kind();
1704 if (nm_kind != nullptr) log->print(" code_compile_kind='%s'", nm_kind);
1705 log->print(" code_compiler='%s'", compiler_name());
1706 if (TieredCompilation) {
1707 log->print(" code_compile_level='%d'", comp_level());
1708 }
1709 #if INCLUDE_JVMCI
1710 if (jvmci_nmethod_data() != nullptr) {
1711 const char* jvmci_name = jvmci_nmethod_data()->name();
1712 if (jvmci_name != nullptr) {
1713 log->print(" jvmci_mirror_name='");
1714 log->text("%s", jvmci_name);
1715 log->print("'");
1716 }
1717 }
1718 #endif
1719 }
1720
1721
1722 #define LOG_OFFSET(log, name) \
1723 if (p2i(name##_end()) - p2i(name##_begin())) \
1724 log->print(" " XSTR(name) "_offset='%zd'" , \
1725 p2i(name##_begin()) - p2i(this))
1726
1727
1728 void nmethod::log_new_nmethod() const {
1729 if (LogCompilation && xtty != nullptr) {
1730 ttyLocker ttyl;
1731 xtty->begin_elem("nmethod");
1732 log_identity(xtty);
1733 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1734 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1735
1736 LOG_OFFSET(xtty, relocation);
1737 LOG_OFFSET(xtty, consts);
1738 LOG_OFFSET(xtty, insts);
1739 LOG_OFFSET(xtty, stub);
1740 LOG_OFFSET(xtty, scopes_data);
1741 LOG_OFFSET(xtty, scopes_pcs);
1742 LOG_OFFSET(xtty, dependencies);
1743 LOG_OFFSET(xtty, handler_table);
1744 LOG_OFFSET(xtty, nul_chk_table);
1745 LOG_OFFSET(xtty, oops);
1746 LOG_OFFSET(xtty, metadata);
1747
1748 xtty->method(method());
1749 xtty->stamp();
1750 xtty->end_elem();
1751 }
1752 }
1753
1754 #undef LOG_OFFSET
1755
1756
1757 // Print out more verbose output usually for a newly created nmethod.
1758 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1759 if (st != nullptr) {
1760 ttyLocker ttyl;
1761 if (WizardMode) {
1762 CompileTask::print(st, this, msg, /*short_form:*/ true);
1763 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1764 } else {
1765 CompileTask::print(st, this, msg, /*short_form:*/ false);
1766 }
1767 }
1768 }
1769
1770 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1771 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1772 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1773 print_nmethod(printnmethods);
1774 }
1775 }
1776
1777 void nmethod::print_nmethod(bool printmethod) {
1778 // Enter a critical section to prevent a race with deopts that patch code and updates the relocation info.
1779 // Unfortunately, we have to lock the NMethodState_lock before the tty lock due to the deadlock rules and
1780 // cannot lock in a more finely grained manner.
1781 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1782 ttyLocker ttyl; // keep the following output all in one block
1783 if (xtty != nullptr) {
1784 xtty->begin_head("print_nmethod");
1785 log_identity(xtty);
1786 xtty->stamp();
1787 xtty->end_head();
1788 }
1789 // Print the header part, then print the requested information.
1790 // This is both handled in decode2().
1791 if (printmethod) {
1792 ResourceMark m;
1793 if (is_compiled_by_c1()) {
1794 tty->cr();
1795 tty->print_cr("============================= C1-compiled nmethod ==============================");
1796 }
1797 if (is_compiled_by_jvmci()) {
1798 tty->cr();
1799 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1800 }
1801 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1802 decode2(tty);
1803 #if defined(SUPPORT_DATA_STRUCTS)
1804 if (AbstractDisassembler::show_structs()) {
1805 // Print the oops from the underlying CodeBlob as well.
1806 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1807 print_oops(tty);
1808 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1809 print_metadata(tty);
1810 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1811 print_pcs_on(tty);
1812 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1813 if (oop_maps() != nullptr) {
1814 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1815 oop_maps()->print_on(tty);
1816 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1817 }
1818 }
1819 #endif
1820 } else {
1821 print(); // print the header part only.
1822 }
1823
1824 #if defined(SUPPORT_DATA_STRUCTS)
1825 if (AbstractDisassembler::show_structs()) {
1826 methodHandle mh(Thread::current(), _method);
1827 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1828 print_scopes();
1829 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1830 }
1831 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1832 print_relocations_on(tty);
1833 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1834 }
1835 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1836 print_dependencies_on(tty);
1837 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1838 }
1839 if (printmethod || PrintExceptionHandlers) {
1840 print_handler_table();
1841 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1842 print_nul_chk_table();
1843 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1844 }
1845
1846 if (printmethod) {
1847 print_recorded_oops();
1848 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1849 print_recorded_metadata();
1850 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1851 }
1852 }
1853 #endif
1854
1855 if (xtty != nullptr) {
1856 xtty->tail("print_nmethod");
1857 }
1858 }
1859
1860
1861 // Promote one word from an assembly-time handle to a live embedded oop.
1862 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1863 if (handle == nullptr ||
1864 // As a special case, IC oops are initialized to 1 or -1.
1865 handle == (jobject) Universe::non_oop_word()) {
1866 *(void**)dest = handle;
1867 } else {
1868 *dest = JNIHandles::resolve_non_null(handle);
1869 }
1870 }
1871
1872 void nmethod::copy_values(GrowableArray<Handle>* array) {
1873 int length = array->length();
1874 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1875 oop* dest = oops_begin();
1876 for (int index = 0 ; index < length; index++) {
1877 dest[index] = array->at(index)();
1878 }
1879 }
1880
1881 // Have to have the same name because it's called by a template
1882 void nmethod::copy_values(GrowableArray<jobject>* array) {
1883 int length = array->length();
1884 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1885 oop* dest = oops_begin();
1886 for (int index = 0 ; index < length; index++) {
1887 initialize_immediate_oop(&dest[index], array->at(index));
1888 }
1889
1890 // Now we can fix up all the oops in the code. We need to do this
1891 // in the code because the assembler uses jobjects as placeholders.
1892 // The code and relocations have already been initialized by the
1893 // CodeBlob constructor, so it is valid even at this early point to
1894 // iterate over relocations and patch the code.
1895 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1896 }
1897
1898 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1899 int length = array->length();
1900 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1901 Metadata** dest = metadata_begin();
1902 for (int index = 0 ; index < length; index++) {
1903 dest[index] = array->at(index);
1904 }
1905 }
1906
1907 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1908 // re-patch all oop-bearing instructions, just in case some oops moved
1909 RelocIterator iter(this, begin, end);
1910 while (iter.next()) {
1911 if (iter.type() == relocInfo::oop_type) {
1912 oop_Relocation* reloc = iter.oop_reloc();
1913 if (initialize_immediates && reloc->oop_is_immediate()) {
1914 oop* dest = reloc->oop_addr();
1915 jobject obj = *reinterpret_cast<jobject*>(dest);
1916 initialize_immediate_oop(dest, obj);
1917 }
1918 // Refresh the oop-related bits of this instruction.
1919 reloc->fix_oop_relocation();
1920 } else if (iter.type() == relocInfo::metadata_type) {
1921 metadata_Relocation* reloc = iter.metadata_reloc();
1922 reloc->fix_metadata_relocation();
1923 }
1924 }
1925 }
1926
1927 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
1928 RelocIterator iter(this);
1929 while (iter.next()) {
1930 if (iter.type() == relocInfo::oop_type) {
1931 oop_Relocation* reloc = iter.oop_reloc();
1932 if (reloc->oop_is_immediate()) {
1933 oop dest = reloc->oop_value();
1934 Handle h(thread, dest);
1935 oop_list.append(h);
1936 }
1937 } else if (iter.type() == relocInfo::metadata_type) {
1938 metadata_Relocation* reloc = iter.metadata_reloc();
1939 if (reloc->metadata_is_immediate()) {
1940 Metadata* m = reloc->metadata_value();
1941 metadata_list.append(m);
1942 }
1943 }
1944 }
1945 }
1946
1947 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1948 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1949 intptr_t cbaddr = (intptr_t) nm;
1950 intptr_t offset = ((intptr_t) pc) - cbaddr;
1951
1952 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1953 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1954 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1955 } else if (!nop->patch(oopmap_slot, offset)) {
1956 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1957 }
1958 }
1959
1960 void nmethod::finalize_relocations() {
1961 NoSafepointVerifier nsv;
1962
1963 GrowableArray<NativeMovConstReg*> virtual_call_data;
1964
1965 // Make sure that post call nops fill in nmethod offsets eagerly so
1966 // we don't have to race with deoptimization
1967 RelocIterator iter(this);
1968 while (iter.next()) {
1969 if (iter.type() == relocInfo::virtual_call_type) {
1970 virtual_call_Relocation* r = iter.virtual_call_reloc();
1971 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1972 virtual_call_data.append(value);
1973 } else if (iter.type() == relocInfo::post_call_nop_type) {
1974 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1975 address pc = reloc->addr();
1976 install_post_call_nop_displacement(this, pc);
1977 }
1978 }
1979
1980 if (virtual_call_data.length() > 0) {
1981 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
1982 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
1983 CompiledICData* next_data = _compiled_ic_data;
1984
1985 for (NativeMovConstReg* value : virtual_call_data) {
1986 value->set_data((intptr_t)next_data);
1987 next_data++;
1988 }
1989 }
1990 }
1991
1992 void nmethod::make_deoptimized() {
1993 if (!Continuations::enabled()) {
1994 // Don't deopt this again.
1995 set_deoptimized_done();
1996 return;
1997 }
1998
1999 assert(method() == nullptr || can_be_deoptimized(), "");
2000
2001 CompiledICLocker ml(this);
2002 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2003
2004 // If post call nops have been already patched, we can just bail-out.
2005 if (has_been_deoptimized()) {
2006 return;
2007 }
2008
2009 ResourceMark rm;
2010 RelocIterator iter(this, oops_reloc_begin());
2011
2012 while (iter.next()) {
2013
2014 switch (iter.type()) {
2015 case relocInfo::virtual_call_type: {
2016 CompiledIC *ic = CompiledIC_at(&iter);
2017 address pc = ic->end_of_call();
2018 NativePostCallNop* nop = nativePostCallNop_at(pc);
2019 if (nop != nullptr) {
2020 nop->make_deopt();
2021 }
2022 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2023 break;
2024 }
2025 case relocInfo::static_call_type:
2026 case relocInfo::opt_virtual_call_type: {
2027 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2028 address pc = csc->end_of_call();
2029 NativePostCallNop* nop = nativePostCallNop_at(pc);
2030 //tty->print_cr(" - static pc %p", pc);
2031 if (nop != nullptr) {
2032 nop->make_deopt();
2033 }
2034 // We can't assert here, there are some calls to stubs / runtime
2035 // that have reloc data and doesn't have a post call NOP.
2036 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2037 break;
2038 }
2039 default:
2040 break;
2041 }
2042 }
2043 // Don't deopt this again.
2044 set_deoptimized_done();
2045 }
2046
2047 void nmethod::verify_clean_inline_caches() {
2048 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2049
2050 ResourceMark rm;
2051 RelocIterator iter(this, oops_reloc_begin());
2052 while(iter.next()) {
2053 switch(iter.type()) {
2054 case relocInfo::virtual_call_type: {
2055 CompiledIC *ic = CompiledIC_at(&iter);
2056 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2057 assert(cb != nullptr, "destination not in CodeBlob?");
2058 nmethod* nm = cb->as_nmethod_or_null();
2059 if (nm != nullptr) {
2060 // Verify that inline caches pointing to bad nmethods are clean
2061 if (!nm->is_in_use() || nm->is_unloading()) {
2062 assert(ic->is_clean(), "IC should be clean");
2063 }
2064 }
2065 break;
2066 }
2067 case relocInfo::static_call_type:
2068 case relocInfo::opt_virtual_call_type: {
2069 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2070 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2071 assert(cb != nullptr, "destination not in CodeBlob?");
2072 nmethod* nm = cb->as_nmethod_or_null();
2073 if (nm != nullptr) {
2074 // Verify that inline caches pointing to bad nmethods are clean
2075 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2076 assert(cdc->is_clean(), "IC should be clean");
2077 }
2078 }
2079 break;
2080 }
2081 default:
2082 break;
2083 }
2084 }
2085 }
2086
2087 void nmethod::mark_as_maybe_on_stack() {
2088 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
2089 }
2090
2091 bool nmethod::is_maybe_on_stack() {
2092 // If the condition below is true, it means that the nmethod was found to
2093 // be alive the previous completed marking cycle.
2094 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2095 }
2096
2097 void nmethod::inc_decompile_count() {
2098 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2099 // Could be gated by ProfileTraps, but do not bother...
2100 Method* m = method();
2101 if (m == nullptr) return;
2102 MethodData* mdo = m->method_data();
2103 if (mdo == nullptr) return;
2104 // There is a benign race here. See comments in methodData.hpp.
2105 mdo->inc_decompile_count();
2106 }
2107
2108 void nmethod::inc_method_profiling_count() {
2109 Atomic::inc(&_method_profiling_count);
2110 }
2111
2112 uint64_t nmethod::method_profiling_count() {
2113 return _method_profiling_count;
2114 }
2115
2116 bool nmethod::try_transition(signed char new_state_int) {
2117 signed char new_state = new_state_int;
2118 assert_lock_strong(NMethodState_lock);
2119 signed char old_state = _state;
2120 if (old_state >= new_state) {
2121 // Ensure monotonicity of transitions.
2122 return false;
2123 }
2124 Atomic::store(&_state, new_state);
2125 return true;
2126 }
2127
2128 void nmethod::invalidate_osr_method() {
2129 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2130 // Remove from list of active nmethods
2131 if (method() != nullptr) {
2132 method()->method_holder()->remove_osr_nmethod(this);
2133 }
2134 }
2135
2136 void nmethod::log_state_change(const char* reason) const {
2137 assert(reason != nullptr, "Must provide a reason");
2138
2139 if (LogCompilation) {
2140 if (xtty != nullptr) {
2141 ttyLocker ttyl; // keep the following output all in one block
2142 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2143 os::current_thread_id(), reason);
2144 log_identity(xtty);
2145 xtty->stamp();
2146 xtty->end_elem();
2147 }
2148 }
2149
2150 ResourceMark rm;
2151 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2152 ss.print("made not entrant: %s", reason);
2153
2154 CompileTask::print_ul(this, ss.freeze());
2155 if (PrintCompilation) {
2156 print_on_with_msg(tty, ss.freeze());
2157 }
2158 }
2159
2160 void nmethod::unlink_from_method() {
2161 if (method() != nullptr) {
2162 method()->unlink_code(this);
2163 }
2164 }
2165
2166 // Invalidate code
2167 bool nmethod::make_not_entrant(const char* reason, bool make_not_entrant) {
2168 assert(reason != nullptr, "Must provide a reason");
2169
2170 // This can be called while the system is already at a safepoint which is ok
2171 NoSafepointVerifier nsv;
2172
2173 if (is_unloading()) {
2174 // If the nmethod is unloading, then it is already not entrant through
2175 // the nmethod entry barriers. No need to do anything; GC will unload it.
2176 return false;
2177 }
2178
2179 if (Atomic::load(&_state) == not_entrant) {
2180 // Avoid taking the lock if already in required state.
2181 // This is safe from races because the state is an end-state,
2182 // which the nmethod cannot back out of once entered.
2183 // No need for fencing either.
2184 return false;
2185 }
2186
2187 {
2188 // Enter critical section. Does not block for safepoint.
2189 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2190
2191 if (Atomic::load(&_state) == not_entrant) {
2192 // another thread already performed this transition so nothing
2193 // to do, but return false to indicate this.
2194 return false;
2195 }
2196
2197 if (is_osr_method()) {
2198 // This logic is equivalent to the logic below for patching the
2199 // verified entry point of regular methods.
2200 // this effectively makes the osr nmethod not entrant
2201 invalidate_osr_method();
2202 } else {
2203 // The caller can be calling the method statically or through an inline
2204 // cache call.
2205 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
2206 SharedRuntime::get_handle_wrong_method_stub());
2207
2208 // Update the relocation info for the patched entry.
2209 // First, get the old relocation info...
2210 RelocIterator iter(this, verified_entry_point(), verified_entry_point() + 8);
2211 if (iter.next() && iter.addr() == verified_entry_point()) {
2212 Relocation* old_reloc = iter.reloc();
2213 // ...then reset the iterator to update it.
2214 RelocIterator iter(this, verified_entry_point(), verified_entry_point() + 8);
2215 relocInfo::change_reloc_info_for_address(&iter, verified_entry_point(), old_reloc->type(),
2216 relocInfo::relocType::runtime_call_type);
2217 }
2218 }
2219
2220 if (update_recompile_counts()) {
2221 // Mark the method as decompiled.
2222 inc_decompile_count();
2223 }
2224
2225 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2226 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2227 // If nmethod entry barriers are not supported, we won't mark
2228 // nmethods as on-stack when they become on-stack. So we
2229 // degrade to a less accurate flushing strategy, for now.
2230 mark_as_maybe_on_stack();
2231 }
2232
2233 // Change state
2234 bool success = try_transition(not_entrant);
2235 assert(success, "Transition can't fail");
2236
2237 // Log the transition once
2238 log_state_change(reason);
2239
2240 // Remove nmethod from method.
2241 unlink_from_method();
2242
2243 if (make_not_entrant) {
2244 // Keep cached code if it was simply replaced
2245 // otherwise make it not entrant too.
2246 AOTCodeCache::invalidate(_aot_code_entry);
2247 }
2248
2249 CompileBroker::log_not_entrant(this);
2250 } // leave critical region under NMethodState_lock
2251
2252 #if INCLUDE_JVMCI
2253 // Invalidate can't occur while holding the NMethodState_lock
2254 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2255 if (nmethod_data != nullptr) {
2256 nmethod_data->invalidate_nmethod_mirror(this);
2257 }
2258 #endif
2259
2260 #ifdef ASSERT
2261 if (is_osr_method() && method() != nullptr) {
2262 // Make sure osr nmethod is invalidated, i.e. not on the list
2263 bool found = method()->method_holder()->remove_osr_nmethod(this);
2264 assert(!found, "osr nmethod should have been invalidated");
2265 }
2266 #endif
2267
2268 return true;
2269 }
2270
2271 // For concurrent GCs, there must be a handshake between unlink and flush
2272 void nmethod::unlink() {
2273 if (is_unlinked()) {
2274 // Already unlinked.
2275 return;
2276 }
2277
2278 flush_dependencies();
2279
2280 // unlink_from_method will take the NMethodState_lock.
2281 // In this case we don't strictly need it when unlinking nmethods from
2282 // the Method, because it is only concurrently unlinked by
2283 // the entry barrier, which acquires the per nmethod lock.
2284 unlink_from_method();
2285
2286 if (is_osr_method()) {
2287 invalidate_osr_method();
2288 }
2289
2290 #if INCLUDE_JVMCI
2291 // Clear the link between this nmethod and a HotSpotNmethod mirror
2292 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2293 if (nmethod_data != nullptr) {
2294 nmethod_data->invalidate_nmethod_mirror(this);
2295 }
2296 #endif
2297
2298 // Post before flushing as jmethodID is being used
2299 post_compiled_method_unload();
2300
2301 // Register for flushing when it is safe. For concurrent class unloading,
2302 // that would be after the unloading handshake, and for STW class unloading
2303 // that would be when getting back to the VM thread.
2304 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2305 }
2306
2307 void nmethod::purge(bool unregister_nmethod) {
2308
2309 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2310
2311 // completely deallocate this method
2312 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2313 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
2314 "/Free CodeCache:%zuKb",
2315 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
2316 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
2317
2318 // We need to deallocate any ExceptionCache data.
2319 // Note that we do not need to grab the nmethod lock for this, it
2320 // better be thread safe if we're disposing of it!
2321 ExceptionCache* ec = exception_cache();
2322 while(ec != nullptr) {
2323 ExceptionCache* next = ec->next();
2324 delete ec;
2325 ec = next;
2326 }
2327 if (_pc_desc_container != nullptr) {
2328 delete _pc_desc_container;
2329 }
2330 if (_compiled_ic_data != nullptr) {
2331 delete[] _compiled_ic_data;
2332 }
2333
2334 if (_immutable_data != data_end() && !AOTCodeCache::is_address_in_aot_cache((address)_oop_maps)) {
2335 os::free(_immutable_data);
2336 _immutable_data = blob_end(); // Valid not null address
2337 }
2338 if (unregister_nmethod) {
2339 Universe::heap()->unregister_nmethod(this);
2340 }
2341 CodeCache::unregister_old_nmethod(this);
2342
2343 CodeBlob::purge();
2344 }
2345
2346 oop nmethod::oop_at(int index) const {
2347 if (index == 0) {
2348 return nullptr;
2349 }
2350
2351 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2352 return bs_nm->oop_load_no_keepalive(this, index);
2353 }
2354
2355 oop nmethod::oop_at_phantom(int index) const {
2356 if (index == 0) {
2357 return nullptr;
2358 }
2359
2360 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2361 return bs_nm->oop_load_phantom(this, index);
2362 }
2363
2364 //
2365 // Notify all classes this nmethod is dependent on that it is no
2366 // longer dependent.
2367
2368 void nmethod::flush_dependencies() {
2369 if (!has_flushed_dependencies()) {
2370 set_has_flushed_dependencies(true);
2371 for (Dependencies::DepStream deps(this); deps.next(); ) {
2372 if (deps.type() == Dependencies::call_site_target_value) {
2373 // CallSite dependencies are managed on per-CallSite instance basis.
2374 oop call_site = deps.argument_oop(0);
2375 MethodHandles::clean_dependency_context(call_site);
2376 } else {
2377 InstanceKlass* ik = deps.context_type();
2378 if (ik == nullptr) {
2379 continue; // ignore things like evol_method
2380 }
2381 // During GC liveness of dependee determines class that needs to be updated.
2382 // The GC may clean dependency contexts concurrently and in parallel.
2383 ik->clean_dependency_context();
2384 }
2385 }
2386 }
2387 }
2388
2389 void nmethod::post_compiled_method(CompileTask* task) {
2390 task->mark_success();
2391 task->set_nm_content_size(content_size());
2392 task->set_nm_insts_size(insts_size());
2393 task->set_nm_total_size(total_size());
2394
2395 // task->is_aot() is true only for loaded cached code.
2396 // nmethod::_aot_code_entry is set for loaded and stored cached code
2397 // to invalidate the entry when nmethod is deoptimized.
2398 // There is option to not store in archive cached code.
2399 guarantee((_aot_code_entry != nullptr) || !task->is_aot() || VerifyCachedCode, "sanity");
2400
2401 // JVMTI -- compiled method notification (must be done outside lock)
2402 post_compiled_method_load_event();
2403
2404 if (CompilationLog::log() != nullptr) {
2405 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2406 }
2407
2408 const DirectiveSet* directive = task->directive();
2409 maybe_print_nmethod(directive);
2410 }
2411
2412 // ------------------------------------------------------------------
2413 // post_compiled_method_load_event
2414 // new method for install_code() path
2415 // Transfer information from compilation to jvmti
2416 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2417 // This is a bad time for a safepoint. We don't want
2418 // this nmethod to get unloaded while we're queueing the event.
2419 NoSafepointVerifier nsv;
2420
2421 Method* m = method();
2422 HOTSPOT_COMPILED_METHOD_LOAD(
2423 (char *) m->klass_name()->bytes(),
2424 m->klass_name()->utf8_length(),
2425 (char *) m->name()->bytes(),
2426 m->name()->utf8_length(),
2427 (char *) m->signature()->bytes(),
2428 m->signature()->utf8_length(),
2429 insts_begin(), insts_size());
2430
2431
2432 if (JvmtiExport::should_post_compiled_method_load()) {
2433 // Only post unload events if load events are found.
2434 set_load_reported();
2435 // If a JavaThread hasn't been passed in, let the Service thread
2436 // (which is a real Java thread) post the event
2437 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2438 if (state == nullptr) {
2439 // Execute any barrier code for this nmethod as if it's called, since
2440 // keeping it alive looks like stack walking.
2441 run_nmethod_entry_barrier();
2442 ServiceThread::enqueue_deferred_event(&event);
2443 } else {
2444 // This enters the nmethod barrier outside in the caller.
2445 state->enqueue_event(&event);
2446 }
2447 }
2448 }
2449
2450 void nmethod::post_compiled_method_unload() {
2451 assert(_method != nullptr, "just checking");
2452 DTRACE_METHOD_UNLOAD_PROBE(method());
2453
2454 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2455 // post the event. The Method* will not be valid when this is freed.
2456
2457 // Don't bother posting the unload if the load event wasn't posted.
2458 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2459 JvmtiDeferredEvent event =
2460 JvmtiDeferredEvent::compiled_method_unload_event(
2461 method()->jmethod_id(), insts_begin());
2462 ServiceThread::enqueue_deferred_event(&event);
2463 }
2464 }
2465
2466 // Iterate over metadata calling this function. Used by RedefineClasses
2467 void nmethod::metadata_do(MetadataClosure* f) {
2468 {
2469 // Visit all immediate references that are embedded in the instruction stream.
2470 RelocIterator iter(this, oops_reloc_begin());
2471 while (iter.next()) {
2472 if (iter.type() == relocInfo::metadata_type) {
2473 metadata_Relocation* r = iter.metadata_reloc();
2474 // In this metadata, we must only follow those metadatas directly embedded in
2475 // the code. Other metadatas (oop_index>0) are seen as part of
2476 // the metadata section below.
2477 assert(1 == (r->metadata_is_immediate()) +
2478 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2479 "metadata must be found in exactly one place");
2480 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2481 Metadata* md = r->metadata_value();
2482 if (md != _method) f->do_metadata(md);
2483 }
2484 } else if (iter.type() == relocInfo::virtual_call_type) {
2485 // Check compiledIC holders associated with this nmethod
2486 ResourceMark rm;
2487 CompiledIC *ic = CompiledIC_at(&iter);
2488 ic->metadata_do(f);
2489 }
2490 }
2491 }
2492
2493 // Visit the metadata section
2494 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2495 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2496 Metadata* md = *p;
2497 f->do_metadata(md);
2498 }
2499
2500 // Visit metadata not embedded in the other places.
2501 if (_method != nullptr) f->do_metadata(_method);
2502 }
2503
2504 // Heuristic for nuking nmethods even though their oops are live.
2505 // Main purpose is to reduce code cache pressure and get rid of
2506 // nmethods that don't seem to be all that relevant any longer.
2507 bool nmethod::is_cold() {
2508 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2509 // No heuristic unloading at all
2510 return false;
2511 }
2512
2513 if (!is_maybe_on_stack() && is_not_entrant()) {
2514 // Not entrant nmethods that are not on any stack can just
2515 // be removed
2516 return true;
2517 }
2518
2519 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2520 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2521 // On platforms that don't support nmethod entry barriers, we can't
2522 // trust the temporal aspect of the gc epochs. So we can't detect
2523 // cold nmethods on such platforms.
2524 return false;
2525 }
2526
2527 if (!UseCodeCacheFlushing) {
2528 // Bail out if we don't heuristically remove nmethods
2529 return false;
2530 }
2531
2532 // Other code can be phased out more gradually after N GCs
2533 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2534 }
2535
2536 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2537 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2538 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2539 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2540 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2541
2542 class IsUnloadingState: public AllStatic {
2543 static const uint8_t _is_unloading_mask = 1;
2544 static const uint8_t _is_unloading_shift = 0;
2545 static const uint8_t _unloading_cycle_mask = 6;
2546 static const uint8_t _unloading_cycle_shift = 1;
2547
2548 static uint8_t set_is_unloading(uint8_t state, bool value) {
2549 state &= (uint8_t)~_is_unloading_mask;
2550 if (value) {
2551 state |= 1 << _is_unloading_shift;
2552 }
2553 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2554 return state;
2555 }
2556
2557 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2558 state &= (uint8_t)~_unloading_cycle_mask;
2559 state |= (uint8_t)(value << _unloading_cycle_shift);
2560 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2561 return state;
2562 }
2563
2564 public:
2565 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2566 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2567
2568 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2569 uint8_t state = 0;
2570 state = set_is_unloading(state, is_unloading);
2571 state = set_unloading_cycle(state, unloading_cycle);
2572 return state;
2573 }
2574 };
2575
2576 bool nmethod::is_unloading() {
2577 uint8_t state = Atomic::load(&_is_unloading_state);
2578 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2579 if (state_is_unloading) {
2580 return true;
2581 }
2582 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2583 uint8_t current_cycle = CodeCache::unloading_cycle();
2584 if (state_unloading_cycle == current_cycle) {
2585 return false;
2586 }
2587
2588 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2589 // should be unloaded. This can be either because there is a dead oop,
2590 // or because is_cold() heuristically determines it is time to unload.
2591 state_unloading_cycle = current_cycle;
2592 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2593 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2594
2595 // Note that if an nmethod has dead oops, everyone will agree that the
2596 // nmethod is_unloading. However, the is_cold heuristics can yield
2597 // different outcomes, so we guard the computed result with a CAS
2598 // to ensure all threads have a shared view of whether an nmethod
2599 // is_unloading or not.
2600 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2601
2602 if (found_state == state) {
2603 // First to change state, we win
2604 return state_is_unloading;
2605 } else {
2606 // State already set, so use it
2607 return IsUnloadingState::is_unloading(found_state);
2608 }
2609 }
2610
2611 void nmethod::clear_unloading_state() {
2612 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2613 Atomic::store(&_is_unloading_state, state);
2614 }
2615
2616
2617 // This is called at the end of the strong tracing/marking phase of a
2618 // GC to unload an nmethod if it contains otherwise unreachable
2619 // oops or is heuristically found to be not important.
2620 void nmethod::do_unloading(bool unloading_occurred) {
2621 // Make sure the oop's ready to receive visitors
2622 if (is_unloading()) {
2623 unlink();
2624 } else {
2625 unload_nmethod_caches(unloading_occurred);
2626 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2627 if (bs_nm != nullptr) {
2628 bs_nm->disarm(this);
2629 }
2630 }
2631 }
2632
2633 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
2634 // Prevent extra code cache walk for platforms that don't have immediate oops.
2635 if (relocInfo::mustIterateImmediateOopsInCode()) {
2636 RelocIterator iter(this, oops_reloc_begin());
2637
2638 while (iter.next()) {
2639 if (iter.type() == relocInfo::oop_type ) {
2640 oop_Relocation* r = iter.oop_reloc();
2641 // In this loop, we must only follow those oops directly embedded in
2642 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2643 assert(1 == (r->oop_is_immediate()) +
2644 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2645 "oop must be found in exactly one place");
2646 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2647 f->do_oop(r->oop_addr());
2648 }
2649 }
2650 }
2651 }
2652
2653 // Scopes
2654 // This includes oop constants not inlined in the code stream.
2655 for (oop* p = oops_begin(); p < oops_end(); p++) {
2656 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2657 f->do_oop(p);
2658 }
2659 }
2660
2661 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2662 // Process oops in the nmethod
2663 oops_do(cl);
2664
2665 // CodeCache unloading support
2666 mark_as_maybe_on_stack();
2667
2668 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2669 bs_nm->disarm(this);
2670
2671 // There's an assumption made that this function is not used by GCs that
2672 // relocate objects, and therefore we don't call fix_oop_relocations.
2673 }
2674
2675 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2676
2677 void nmethod::oops_do_log_change(const char* state) {
2678 LogTarget(Trace, gc, nmethod) lt;
2679 if (lt.is_enabled()) {
2680 LogStream ls(lt);
2681 CompileTask::print(&ls, this, state, true /* short_form */);
2682 }
2683 }
2684
2685 bool nmethod::oops_do_try_claim() {
2686 if (oops_do_try_claim_weak_request()) {
2687 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2688 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2689 return true;
2690 }
2691 return false;
2692 }
2693
2694 bool nmethod::oops_do_try_claim_weak_request() {
2695 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2696
2697 if ((_oops_do_mark_link == nullptr) &&
2698 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2699 oops_do_log_change("oops_do, mark weak request");
2700 return true;
2701 }
2702 return false;
2703 }
2704
2705 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2706 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2707 }
2708
2709 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2710 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2711
2712 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2713 if (old_next == nullptr) {
2714 oops_do_log_change("oops_do, mark strong done");
2715 }
2716 return old_next;
2717 }
2718
2719 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2720 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2721 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2722
2723 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2724 if (old_next == next) {
2725 oops_do_log_change("oops_do, mark strong request");
2726 }
2727 return old_next;
2728 }
2729
2730 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2731 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2732 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2733
2734 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2735 if (old_next == next) {
2736 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2737 return true;
2738 }
2739 return false;
2740 }
2741
2742 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2743 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2744
2745 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2746 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2747 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2748
2749 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2750 // Self-loop if needed.
2751 if (old_head == nullptr) {
2752 old_head = this;
2753 }
2754 // Try to install end of list and weak done tag.
2755 if (Atomic::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
2756 oops_do_log_change("oops_do, mark weak done");
2757 return nullptr;
2758 } else {
2759 return old_head;
2760 }
2761 }
2762
2763 void nmethod::oops_do_add_to_list_as_strong_done() {
2764 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2765
2766 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2767 // Self-loop if needed.
2768 if (old_head == nullptr) {
2769 old_head = this;
2770 }
2771 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2772 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2773
2774 oops_do_set_strong_done(old_head);
2775 }
2776
2777 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2778 if (!oops_do_try_claim_weak_request()) {
2779 // Failed to claim for weak processing.
2780 oops_do_log_change("oops_do, mark weak request fail");
2781 return;
2782 }
2783
2784 p->do_regular_processing(this);
2785
2786 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2787 if (old_head == nullptr) {
2788 return;
2789 }
2790 oops_do_log_change("oops_do, mark weak done fail");
2791 // Adding to global list failed, another thread added a strong request.
2792 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2793 "must be but is %u", extract_state(_oops_do_mark_link));
2794
2795 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2796
2797 oops_do_set_strong_done(old_head);
2798 // Do missing strong processing.
2799 p->do_remaining_strong_processing(this);
2800 }
2801
2802 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2803 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2804 if (next_raw == nullptr) {
2805 p->do_regular_processing(this);
2806 oops_do_add_to_list_as_strong_done();
2807 return;
2808 }
2809 // Claim failed. Figure out why and handle it.
2810 if (oops_do_has_weak_request(next_raw)) {
2811 oops_do_mark_link* old = next_raw;
2812 // Claim failed because being weak processed (state == "weak request").
2813 // Try to request deferred strong processing.
2814 next_raw = oops_do_try_add_strong_request(old);
2815 if (next_raw == old) {
2816 // Successfully requested deferred strong processing.
2817 return;
2818 }
2819 // Failed because of a concurrent transition. No longer in "weak request" state.
2820 }
2821 if (oops_do_has_any_strong_state(next_raw)) {
2822 // Already claimed for strong processing or requested for such.
2823 return;
2824 }
2825 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2826 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2827 p->do_remaining_strong_processing(this);
2828 return;
2829 }
2830 // Claim failed, some other thread got it.
2831 }
2832
2833 void nmethod::oops_do_marking_prologue() {
2834 assert_at_safepoint();
2835
2836 log_trace(gc, nmethod)("oops_do_marking_prologue");
2837 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2838 }
2839
2840 void nmethod::oops_do_marking_epilogue() {
2841 assert_at_safepoint();
2842
2843 nmethod* next = _oops_do_mark_nmethods;
2844 _oops_do_mark_nmethods = nullptr;
2845 if (next != nullptr) {
2846 nmethod* cur;
2847 do {
2848 cur = next;
2849 next = extract_nmethod(cur->_oops_do_mark_link);
2850 cur->_oops_do_mark_link = nullptr;
2851 DEBUG_ONLY(cur->verify_oop_relocations());
2852
2853 LogTarget(Trace, gc, nmethod) lt;
2854 if (lt.is_enabled()) {
2855 LogStream ls(lt);
2856 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2857 }
2858 // End if self-loop has been detected.
2859 } while (cur != next);
2860 }
2861 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2862 }
2863
2864 inline bool includes(void* p, void* from, void* to) {
2865 return from <= p && p < to;
2866 }
2867
2868
2869 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2870 assert(count >= 2, "must be sentinel values, at least");
2871
2872 #ifdef ASSERT
2873 // must be sorted and unique; we do a binary search in find_pc_desc()
2874 int prev_offset = pcs[0].pc_offset();
2875 assert(prev_offset == PcDesc::lower_offset_limit,
2876 "must start with a sentinel");
2877 for (int i = 1; i < count; i++) {
2878 int this_offset = pcs[i].pc_offset();
2879 assert(this_offset > prev_offset, "offsets must be sorted");
2880 prev_offset = this_offset;
2881 }
2882 assert(prev_offset == PcDesc::upper_offset_limit,
2883 "must end with a sentinel");
2884 #endif //ASSERT
2885
2886 // Search for MethodHandle invokes and tag the nmethod.
2887 for (int i = 0; i < count; i++) {
2888 if (pcs[i].is_method_handle_invoke()) {
2889 set_has_method_handle_invokes(true);
2890 break;
2891 }
2892 }
2893 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler");
2894
2895 int size = count * sizeof(PcDesc);
2896 assert(scopes_pcs_size() >= size, "oob");
2897 memcpy(scopes_pcs_begin(), pcs, size);
2898
2899 // Adjust the final sentinel downward.
2900 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2901 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2902 last_pc->set_pc_offset(content_size() + 1);
2903 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2904 // Fill any rounding gaps with copies of the last record.
2905 last_pc[1] = last_pc[0];
2906 }
2907 // The following assert could fail if sizeof(PcDesc) is not
2908 // an integral multiple of oopSize (the rounding term).
2909 // If it fails, change the logic to always allocate a multiple
2910 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2911 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2912 }
2913
2914 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2915 assert(scopes_data_size() >= size, "oob");
2916 memcpy(scopes_data_begin(), buffer, size);
2917 }
2918
2919 #ifdef ASSERT
2920 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2921 PcDesc* res = nullptr;
2922 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2923 "must start with a sentinel");
2924 // lower + 1 to exclude initial sentinel
2925 for (PcDesc* p = lower + 1; p < upper; p++) {
2926 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2927 if (match_desc(p, pc_offset, approximate)) {
2928 if (res == nullptr) {
2929 res = p;
2930 } else {
2931 res = (PcDesc*) badAddress;
2932 }
2933 }
2934 }
2935 return res;
2936 }
2937 #endif
2938
2939
2940 #ifndef PRODUCT
2941 // Version of method to collect statistic
2942 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2943 PcDesc* lower, PcDesc* upper) {
2944 ++pc_nmethod_stats.pc_desc_queries;
2945 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2946
2947 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2948 assert(desc != nullptr, "PcDesc cache should be initialized already");
2949 if (desc->pc_offset() == (pc - code_begin)) {
2950 // Cached value matched
2951 ++pc_nmethod_stats.pc_desc_tests;
2952 ++pc_nmethod_stats.pc_desc_repeats;
2953 return desc;
2954 }
2955 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2956 }
2957 #endif
2958
2959 // Finds a PcDesc with real-pc equal to "pc"
2960 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2961 PcDesc* lower_incl, PcDesc* upper_incl) {
2962 if ((pc < code_begin) ||
2963 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2964 return nullptr; // PC is wildly out of range
2965 }
2966 int pc_offset = (int) (pc - code_begin);
2967
2968 // Check the PcDesc cache if it contains the desired PcDesc
2969 // (This as an almost 100% hit rate.)
2970 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2971 if (res != nullptr) {
2972 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2973 return res;
2974 }
2975
2976 // Fallback algorithm: quasi-linear search for the PcDesc
2977 // Find the last pc_offset less than the given offset.
2978 // The successor must be the required match, if there is a match at all.
2979 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2980 PcDesc* lower = lower_incl; // this is initial sentinel
2981 PcDesc* upper = upper_incl - 1; // exclude final sentinel
2982 if (lower >= upper) return nullptr; // no PcDescs at all
2983
2984 #define assert_LU_OK \
2985 /* invariant on lower..upper during the following search: */ \
2986 assert(lower->pc_offset() < pc_offset, "sanity"); \
2987 assert(upper->pc_offset() >= pc_offset, "sanity")
2988 assert_LU_OK;
2989
2990 // Use the last successful return as a split point.
2991 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2992 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2993 if (mid->pc_offset() < pc_offset) {
2994 lower = mid;
2995 } else {
2996 upper = mid;
2997 }
2998
2999 // Take giant steps at first (4096, then 256, then 16, then 1)
3000 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3001 const int RADIX = (1 << LOG2_RADIX);
3002 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3003 while ((mid = lower + step) < upper) {
3004 assert_LU_OK;
3005 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3006 if (mid->pc_offset() < pc_offset) {
3007 lower = mid;
3008 } else {
3009 upper = mid;
3010 break;
3011 }
3012 }
3013 assert_LU_OK;
3014 }
3015
3016 // Sneak up on the value with a linear search of length ~16.
3017 while (true) {
3018 assert_LU_OK;
3019 mid = lower + 1;
3020 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3021 if (mid->pc_offset() < pc_offset) {
3022 lower = mid;
3023 } else {
3024 upper = mid;
3025 break;
3026 }
3027 }
3028 #undef assert_LU_OK
3029
3030 if (match_desc(upper, pc_offset, approximate)) {
3031 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3032 if (!Thread::current_in_asgct()) {
3033 // we don't want to modify the cache if we're in ASGCT
3034 // which is typically called in a signal handler
3035 _pc_desc_cache.add_pc_desc(upper);
3036 }
3037 return upper;
3038 } else {
3039 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3040 return nullptr;
3041 }
3042 }
3043
3044 bool nmethod::check_dependency_on(DepChange& changes) {
3045 // What has happened:
3046 // 1) a new class dependee has been added
3047 // 2) dependee and all its super classes have been marked
3048 bool found_check = false; // set true if we are upset
3049 for (Dependencies::DepStream deps(this); deps.next(); ) {
3050 // Evaluate only relevant dependencies.
3051 if (deps.spot_check_dependency_at(changes) != nullptr) {
3052 found_check = true;
3053 NOT_DEBUG(break);
3054 }
3055 }
3056 return found_check;
3057 }
3058
3059 // Called from mark_for_deoptimization, when dependee is invalidated.
3060 bool nmethod::is_dependent_on_method(Method* dependee) {
3061 for (Dependencies::DepStream deps(this); deps.next(); ) {
3062 if (deps.type() != Dependencies::evol_method)
3063 continue;
3064 Method* method = deps.method_argument(0);
3065 if (method == dependee) return true;
3066 }
3067 return false;
3068 }
3069
3070 void nmethod_init() {
3071 // make sure you didn't forget to adjust the filler fields
3072 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3073 }
3074
3075 // -----------------------------------------------------------------------------
3076 // Verification
3077
3078 class VerifyOopsClosure: public OopClosure {
3079 nmethod* _nm;
3080 bool _ok;
3081 public:
3082 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3083 bool ok() { return _ok; }
3084 virtual void do_oop(oop* p) {
3085 if (oopDesc::is_oop_or_null(*p)) return;
3086 // Print diagnostic information before calling print_nmethod().
3087 // Assertions therein might prevent call from returning.
3088 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3089 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3090 if (_ok) {
3091 _nm->print_nmethod(true);
3092 _ok = false;
3093 }
3094 }
3095 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3096 };
3097
3098 class VerifyMetadataClosure: public MetadataClosure {
3099 public:
3100 void do_metadata(Metadata* md) {
3101 if (md->is_method()) {
3102 Method* method = (Method*)md;
3103 assert(!method->is_old(), "Should not be installing old methods");
3104 }
3105 }
3106 };
3107
3108
3109 void nmethod::verify() {
3110 if (is_not_entrant())
3111 return;
3112
3113 // Make sure all the entry points are correctly aligned for patching.
3114 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
3115
3116 // assert(oopDesc::is_oop(method()), "must be valid");
3117
3118 ResourceMark rm;
3119
3120 if (!CodeCache::contains(this)) {
3121 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3122 }
3123
3124 if(is_native_method() )
3125 return;
3126
3127 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3128 if (nm != this) {
3129 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3130 }
3131
3132 // Verification can triggered during shutdown after AOTCodeCache is closed.
3133 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3134 if (!is_aot() || AOTCodeCache::is_on()) {
3135 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3136 if (! p->verify(this)) {
3137 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3138 }
3139 }
3140
3141 #ifdef ASSERT
3142 #if INCLUDE_JVMCI
3143 {
3144 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3145 ImmutableOopMapSet* oms = oop_maps();
3146 ImplicitExceptionTable implicit_table(this);
3147 for (uint i = 0; i < implicit_table.len(); i++) {
3148 int exec_offset = (int) implicit_table.get_exec_offset(i);
3149 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3150 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3151 bool found = false;
3152 for (int i = 0, imax = oms->count(); i < imax; i++) {
3153 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3154 found = true;
3155 break;
3156 }
3157 }
3158 assert(found, "missing oopmap");
3159 }
3160 }
3161 }
3162 #endif
3163 #endif
3164 }
3165
3166 VerifyOopsClosure voc(this);
3167 oops_do(&voc);
3168 assert(voc.ok(), "embedded oops must be OK");
3169 Universe::heap()->verify_nmethod(this);
3170
3171 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3172 nm->method()->external_name(), p2i(_oops_do_mark_link));
3173 if (!is_aot() || AOTCodeCache::is_on()) {
3174 verify_scopes();
3175 }
3176
3177 CompiledICLocker nm_verify(this);
3178 VerifyMetadataClosure vmc;
3179 metadata_do(&vmc);
3180 }
3181
3182
3183 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3184
3185 // Verify IC only when nmethod installation is finished.
3186 if (!is_not_installed()) {
3187 if (CompiledICLocker::is_safe(this)) {
3188 if (is_inline_cache) {
3189 CompiledIC_at(this, call_site);
3190 } else {
3191 CompiledDirectCall::at(call_site);
3192 }
3193 } else {
3194 CompiledICLocker ml_verify(this);
3195 if (is_inline_cache) {
3196 CompiledIC_at(this, call_site);
3197 } else {
3198 CompiledDirectCall::at(call_site);
3199 }
3200 }
3201 }
3202
3203 HandleMark hm(Thread::current());
3204
3205 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3206 assert(pd != nullptr, "PcDesc must exist");
3207 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3208 !sd->is_top(); sd = sd->sender()) {
3209 sd->verify();
3210 }
3211 }
3212
3213 void nmethod::verify_scopes() {
3214 if( !method() ) return; // Runtime stubs have no scope
3215 if (method()->is_native()) return; // Ignore stub methods.
3216 // iterate through all interrupt point
3217 // and verify the debug information is valid.
3218 RelocIterator iter(this);
3219 while (iter.next()) {
3220 address stub = nullptr;
3221 switch (iter.type()) {
3222 case relocInfo::virtual_call_type:
3223 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3224 break;
3225 case relocInfo::opt_virtual_call_type:
3226 stub = iter.opt_virtual_call_reloc()->static_stub();
3227 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3228 break;
3229 case relocInfo::static_call_type:
3230 stub = iter.static_call_reloc()->static_stub();
3231 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3232 break;
3233 case relocInfo::runtime_call_type:
3234 case relocInfo::runtime_call_w_cp_type: {
3235 address destination = iter.reloc()->value();
3236 // Right now there is no way to find out which entries support
3237 // an interrupt point. It would be nice if we had this
3238 // information in a table.
3239 break;
3240 }
3241 default:
3242 break;
3243 }
3244 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3245 }
3246 }
3247
3248
3249 // -----------------------------------------------------------------------------
3250 // Printing operations
3251
3252 void nmethod::print_on_impl(outputStream* st) const {
3253 ResourceMark rm;
3254
3255 st->print("Compiled method ");
3256
3257 if (is_compiled_by_c1()) {
3258 st->print("(c1) ");
3259 } else if (is_compiled_by_c2()) {
3260 st->print("(c2) ");
3261 } else if (is_compiled_by_jvmci()) {
3262 st->print("(JVMCI) ");
3263 } else {
3264 st->print("(n/a) ");
3265 }
3266
3267 print_on_with_msg(st, nullptr);
3268
3269 if (WizardMode) {
3270 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3271 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3272 st->print(" { ");
3273 st->print_cr("%s ", state());
3274 st->print_cr("}:");
3275 }
3276 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3277 p2i(this),
3278 p2i(this) + size(),
3279 size());
3280 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3281 p2i(consts_begin()),
3282 p2i(consts_end()),
3283 consts_size());
3284 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3285 p2i(insts_begin()),
3286 p2i(insts_end()),
3287 insts_size());
3288 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3289 p2i(stub_begin()),
3290 p2i(stub_end()),
3291 stub_size());
3292 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3293 p2i(oops_begin()),
3294 p2i(oops_end()),
3295 oops_size());
3296 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3297 p2i(mutable_data_begin()),
3298 p2i(mutable_data_end()),
3299 mutable_data_size());
3300 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3301 p2i(relocation_begin()),
3302 p2i(relocation_end()),
3303 relocation_size());
3304 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3305 p2i(metadata_begin()),
3306 p2i(metadata_end()),
3307 metadata_size());
3308 #if INCLUDE_JVMCI
3309 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3310 p2i(jvmci_data_begin()),
3311 p2i(jvmci_data_end()),
3312 jvmci_data_size());
3313 #endif
3314 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3315 p2i(immutable_data_begin()),
3316 p2i(immutable_data_end()),
3317 immutable_data_size());
3318 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3319 p2i(dependencies_begin()),
3320 p2i(dependencies_end()),
3321 dependencies_size());
3322 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3323 p2i(nul_chk_table_begin()),
3324 p2i(nul_chk_table_end()),
3325 nul_chk_table_size());
3326 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3327 p2i(handler_table_begin()),
3328 p2i(handler_table_end()),
3329 handler_table_size());
3330 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3331 p2i(scopes_pcs_begin()),
3332 p2i(scopes_pcs_end()),
3333 scopes_pcs_size());
3334 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3335 p2i(scopes_data_begin()),
3336 p2i(scopes_data_end()),
3337 scopes_data_size());
3338 #if INCLUDE_JVMCI
3339 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3340 p2i(speculations_begin()),
3341 p2i(speculations_end()),
3342 speculations_size());
3343 #endif
3344 if (AOTCodeCache::is_on() && _aot_code_entry != nullptr) {
3345 _aot_code_entry->print(st);
3346 }
3347 }
3348
3349 void nmethod::print_code() {
3350 ResourceMark m;
3351 ttyLocker ttyl;
3352 // Call the specialized decode method of this class.
3353 decode(tty);
3354 }
3355
3356 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3357
3358 void nmethod::print_dependencies_on(outputStream* out) {
3359 ResourceMark rm;
3360 stringStream st;
3361 st.print_cr("Dependencies:");
3362 for (Dependencies::DepStream deps(this); deps.next(); ) {
3363 deps.print_dependency(&st);
3364 InstanceKlass* ctxk = deps.context_type();
3365 if (ctxk != nullptr) {
3366 if (ctxk->is_dependent_nmethod(this)) {
3367 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3368 }
3369 }
3370 deps.log_dependency(); // put it into the xml log also
3371 }
3372 out->print_raw(st.as_string());
3373 }
3374 #endif
3375
3376 #if defined(SUPPORT_DATA_STRUCTS)
3377
3378 // Print the oops from the underlying CodeBlob.
3379 void nmethod::print_oops(outputStream* st) {
3380 ResourceMark m;
3381 st->print("Oops:");
3382 if (oops_begin() < oops_end()) {
3383 st->cr();
3384 for (oop* p = oops_begin(); p < oops_end(); p++) {
3385 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3386 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3387 if (Universe::contains_non_oop_word(p)) {
3388 st->print_cr("NON_OOP");
3389 continue; // skip non-oops
3390 }
3391 if (*p == nullptr) {
3392 st->print_cr("nullptr-oop");
3393 continue; // skip non-oops
3394 }
3395 (*p)->print_value_on(st);
3396 st->cr();
3397 }
3398 } else {
3399 st->print_cr(" <list empty>");
3400 }
3401 }
3402
3403 // Print metadata pool.
3404 void nmethod::print_metadata(outputStream* st) {
3405 ResourceMark m;
3406 st->print("Metadata:");
3407 if (metadata_begin() < metadata_end()) {
3408 st->cr();
3409 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3410 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3411 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3412 if (*p && *p != Universe::non_oop_word()) {
3413 (*p)->print_value_on(st);
3414 }
3415 st->cr();
3416 }
3417 } else {
3418 st->print_cr(" <list empty>");
3419 }
3420 }
3421
3422 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3423 void nmethod::print_scopes_on(outputStream* st) {
3424 // Find the first pc desc for all scopes in the code and print it.
3425 ResourceMark rm;
3426 st->print("scopes:");
3427 if (scopes_pcs_begin() < scopes_pcs_end()) {
3428 st->cr();
3429 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3430 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3431 continue;
3432
3433 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3434 while (sd != nullptr) {
3435 sd->print_on(st, p); // print output ends with a newline
3436 sd = sd->sender();
3437 }
3438 }
3439 } else {
3440 st->print_cr(" <list empty>");
3441 }
3442 }
3443 #endif
3444
3445 #ifndef PRODUCT // RelocIterator does support printing only then.
3446 void nmethod::print_relocations_on(outputStream* st) {
3447 ResourceMark m; // in case methods get printed via the debugger
3448 st->print_cr("relocations:");
3449 RelocIterator iter(this);
3450 iter.print_on(st);
3451 }
3452 #endif
3453
3454 void nmethod::print_pcs_on(outputStream* st) {
3455 ResourceMark m; // in case methods get printed via debugger
3456 st->print("pc-bytecode offsets:");
3457 if (scopes_pcs_begin() < scopes_pcs_end()) {
3458 st->cr();
3459 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3460 p->print_on(st, this); // print output ends with a newline
3461 }
3462 } else {
3463 st->print_cr(" <list empty>");
3464 }
3465 }
3466
3467 void nmethod::print_handler_table() {
3468 ExceptionHandlerTable(this).print(code_begin());
3469 }
3470
3471 void nmethod::print_nul_chk_table() {
3472 ImplicitExceptionTable(this).print(code_begin());
3473 }
3474
3475 void nmethod::print_recorded_oop(int log_n, int i) {
3476 void* value;
3477
3478 if (i == 0) {
3479 value = nullptr;
3480 } else {
3481 // Be careful around non-oop words. Don't create an oop
3482 // with that value, or it will assert in verification code.
3483 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3484 value = Universe::non_oop_word();
3485 } else {
3486 value = oop_at(i);
3487 }
3488 }
3489
3490 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3491
3492 if (value == Universe::non_oop_word()) {
3493 tty->print("non-oop word");
3494 } else {
3495 if (value == nullptr) {
3496 tty->print("nullptr-oop");
3497 } else {
3498 oop_at(i)->print_value_on(tty);
3499 }
3500 }
3501
3502 tty->cr();
3503 }
3504
3505 void nmethod::print_recorded_oops() {
3506 const int n = oops_count();
3507 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3508 tty->print("Recorded oops:");
3509 if (n > 0) {
3510 tty->cr();
3511 for (int i = 0; i < n; i++) {
3512 print_recorded_oop(log_n, i);
3513 }
3514 } else {
3515 tty->print_cr(" <list empty>");
3516 }
3517 }
3518
3519 void nmethod::print_recorded_metadata() {
3520 const int n = metadata_count();
3521 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3522 tty->print("Recorded metadata:");
3523 if (n > 0) {
3524 tty->cr();
3525 for (int i = 0; i < n; i++) {
3526 Metadata* m = metadata_at(i);
3527 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3528 if (m == (Metadata*)Universe::non_oop_word()) {
3529 tty->print("non-metadata word");
3530 } else if (m == nullptr) {
3531 tty->print("nullptr-oop");
3532 } else {
3533 Metadata::print_value_on_maybe_null(tty, m);
3534 }
3535 tty->cr();
3536 }
3537 } else {
3538 tty->print_cr(" <list empty>");
3539 }
3540 }
3541 #endif
3542
3543 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3544
3545 void nmethod::print_constant_pool(outputStream* st) {
3546 //-----------------------------------
3547 //---< Print the constant pool >---
3548 //-----------------------------------
3549 int consts_size = this->consts_size();
3550 if ( consts_size > 0 ) {
3551 unsigned char* cstart = this->consts_begin();
3552 unsigned char* cp = cstart;
3553 unsigned char* cend = cp + consts_size;
3554 unsigned int bytes_per_line = 4;
3555 unsigned int CP_alignment = 8;
3556 unsigned int n;
3557
3558 st->cr();
3559
3560 //---< print CP header to make clear what's printed >---
3561 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3562 n = bytes_per_line;
3563 st->print_cr("[Constant Pool]");
3564 Disassembler::print_location(cp, cstart, cend, st, true, true);
3565 Disassembler::print_hexdata(cp, n, st, true);
3566 st->cr();
3567 } else {
3568 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3569 st->print_cr("[Constant Pool (unaligned)]");
3570 }
3571
3572 //---< print CP contents, bytes_per_line at a time >---
3573 while (cp < cend) {
3574 Disassembler::print_location(cp, cstart, cend, st, true, false);
3575 Disassembler::print_hexdata(cp, n, st, false);
3576 cp += n;
3577 n = bytes_per_line;
3578 st->cr();
3579 }
3580
3581 //---< Show potential alignment gap between constant pool and code >---
3582 cend = code_begin();
3583 if( cp < cend ) {
3584 n = 4;
3585 st->print_cr("[Code entry alignment]");
3586 while (cp < cend) {
3587 Disassembler::print_location(cp, cstart, cend, st, false, false);
3588 cp += n;
3589 st->cr();
3590 }
3591 }
3592 } else {
3593 st->print_cr("[Constant Pool (empty)]");
3594 }
3595 st->cr();
3596 }
3597
3598 #endif
3599
3600 // Disassemble this nmethod.
3601 // Print additional debug information, if requested. This could be code
3602 // comments, block comments, profiling counters, etc.
3603 // The undisassembled format is useful no disassembler library is available.
3604 // The resulting hex dump (with markers) can be disassembled later, or on
3605 // another system, when/where a disassembler library is available.
3606 void nmethod::decode2(outputStream* ost) const {
3607
3608 // Called from frame::back_trace_with_decode without ResourceMark.
3609 ResourceMark rm;
3610
3611 // Make sure we have a valid stream to print on.
3612 outputStream* st = ost ? ost : tty;
3613
3614 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3615 const bool use_compressed_format = true;
3616 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3617 AbstractDisassembler::show_block_comment());
3618 #else
3619 const bool use_compressed_format = Disassembler::is_abstract();
3620 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3621 AbstractDisassembler::show_block_comment());
3622 #endif
3623
3624 st->cr();
3625 this->print_on(st);
3626 st->cr();
3627
3628 #if defined(SUPPORT_ASSEMBLY)
3629 //----------------------------------
3630 //---< Print real disassembly >---
3631 //----------------------------------
3632 if (! use_compressed_format) {
3633 st->print_cr("[Disassembly]");
3634 Disassembler::decode(const_cast<nmethod*>(this), st);
3635 st->bol();
3636 st->print_cr("[/Disassembly]");
3637 return;
3638 }
3639 #endif
3640
3641 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3642
3643 // Compressed undisassembled disassembly format.
3644 // The following status values are defined/supported:
3645 // = 0 - currently at bol() position, nothing printed yet on current line.
3646 // = 1 - currently at position after print_location().
3647 // > 1 - in the midst of printing instruction stream bytes.
3648 int compressed_format_idx = 0;
3649 int code_comment_column = 0;
3650 const int instr_maxlen = Assembler::instr_maxlen();
3651 const uint tabspacing = 8;
3652 unsigned char* start = this->code_begin();
3653 unsigned char* p = this->code_begin();
3654 unsigned char* end = this->code_end();
3655 unsigned char* pss = p; // start of a code section (used for offsets)
3656
3657 if ((start == nullptr) || (end == nullptr)) {
3658 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3659 return;
3660 }
3661 #endif
3662
3663 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3664 //---< plain abstract disassembly, no comments or anything, just section headers >---
3665 if (use_compressed_format && ! compressed_with_comments) {
3666 const_cast<nmethod*>(this)->print_constant_pool(st);
3667
3668 //---< Open the output (Marker for post-mortem disassembler) >---
3669 st->print_cr("[MachCode]");
3670 const char* header = nullptr;
3671 address p0 = p;
3672 while (p < end) {
3673 address pp = p;
3674 while ((p < end) && (header == nullptr)) {
3675 header = nmethod_section_label(p);
3676 pp = p;
3677 p += Assembler::instr_len(p);
3678 }
3679 if (pp > p0) {
3680 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3681 p0 = pp;
3682 p = pp;
3683 header = nullptr;
3684 } else if (header != nullptr) {
3685 st->bol();
3686 st->print_cr("%s", header);
3687 header = nullptr;
3688 }
3689 }
3690 //---< Close the output (Marker for post-mortem disassembler) >---
3691 st->bol();
3692 st->print_cr("[/MachCode]");
3693 return;
3694 }
3695 #endif
3696
3697 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3698 //---< abstract disassembly with comments and section headers merged in >---
3699 if (compressed_with_comments) {
3700 const_cast<nmethod*>(this)->print_constant_pool(st);
3701
3702 //---< Open the output (Marker for post-mortem disassembler) >---
3703 st->print_cr("[MachCode]");
3704 while ((p < end) && (p != nullptr)) {
3705 const int instruction_size_in_bytes = Assembler::instr_len(p);
3706
3707 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3708 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3709 // Prints nmethod_section_label as well.
3710 if (AbstractDisassembler::show_block_comment()) {
3711 print_block_comment(st, p);
3712 if (st->position() == 0) {
3713 compressed_format_idx = 0;
3714 }
3715 }
3716
3717 //---< New location information after line break >---
3718 if (compressed_format_idx == 0) {
3719 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3720 compressed_format_idx = 1;
3721 }
3722
3723 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3724 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3725 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3726
3727 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3728 //---< interrupt instruction byte stream for code comment >---
3729 if (compressed_format_idx > 1) {
3730 st->cr(); // interrupt byte stream
3731 st->cr(); // add an empty line
3732 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3733 }
3734 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3735 st->bol();
3736 compressed_format_idx = 0;
3737 }
3738
3739 //---< New location information after line break >---
3740 if (compressed_format_idx == 0) {
3741 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3742 compressed_format_idx = 1;
3743 }
3744
3745 //---< Nicely align instructions for readability >---
3746 if (compressed_format_idx > 1) {
3747 Disassembler::print_delimiter(st);
3748 }
3749
3750 //---< Now, finally, print the actual instruction bytes >---
3751 unsigned char* p0 = p;
3752 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3753 compressed_format_idx += (int)(p - p0);
3754
3755 if (Disassembler::start_newline(compressed_format_idx-1)) {
3756 st->cr();
3757 compressed_format_idx = 0;
3758 }
3759 }
3760 //---< Close the output (Marker for post-mortem disassembler) >---
3761 st->bol();
3762 st->print_cr("[/MachCode]");
3763 return;
3764 }
3765 #endif
3766 }
3767
3768 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3769
3770 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3771 RelocIterator iter(this, begin, end);
3772 bool have_one = false;
3773 while (iter.next()) {
3774 have_one = true;
3775 switch (iter.type()) {
3776 case relocInfo::none: {
3777 // Skip it and check next
3778 break;
3779 }
3780 case relocInfo::oop_type: {
3781 // Get a non-resizable resource-allocated stringStream.
3782 // Our callees make use of (nested) ResourceMarks.
3783 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3784 oop_Relocation* r = iter.oop_reloc();
3785 oop obj = r->oop_value();
3786 st.print("oop(");
3787 if (obj == nullptr) st.print("nullptr");
3788 else obj->print_value_on(&st);
3789 st.print(")");
3790 return st.as_string();
3791 }
3792 case relocInfo::metadata_type: {
3793 stringStream st;
3794 metadata_Relocation* r = iter.metadata_reloc();
3795 Metadata* obj = r->metadata_value();
3796 st.print("metadata(");
3797 if (obj == nullptr) st.print("nullptr");
3798 else obj->print_value_on(&st);
3799 st.print(")");
3800 return st.as_string();
3801 }
3802 case relocInfo::runtime_call_type:
3803 case relocInfo::runtime_call_w_cp_type: {
3804 stringStream st;
3805 st.print("runtime_call");
3806 CallRelocation* r = (CallRelocation*)iter.reloc();
3807 address dest = r->destination();
3808 if (StubRoutines::contains(dest)) {
3809 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3810 if (desc == nullptr) {
3811 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3812 }
3813 if (desc != nullptr) {
3814 st.print(" Stub::%s", desc->name());
3815 return st.as_string();
3816 }
3817 }
3818 CodeBlob* cb = CodeCache::find_blob(dest);
3819 if (cb != nullptr) {
3820 st.print(" %s", cb->name());
3821 } else {
3822 ResourceMark rm;
3823 const int buflen = 1024;
3824 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3825 int offset;
3826 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3827 st.print(" %s", buf);
3828 if (offset != 0) {
3829 st.print("+%d", offset);
3830 }
3831 }
3832 }
3833 return st.as_string();
3834 }
3835 case relocInfo::virtual_call_type: {
3836 stringStream st;
3837 st.print_raw("virtual_call");
3838 virtual_call_Relocation* r = iter.virtual_call_reloc();
3839 Method* m = r->method_value();
3840 if (m != nullptr) {
3841 assert(m->is_method(), "");
3842 m->print_short_name(&st);
3843 }
3844 return st.as_string();
3845 }
3846 case relocInfo::opt_virtual_call_type: {
3847 stringStream st;
3848 st.print_raw("optimized virtual_call");
3849 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3850 Method* m = r->method_value();
3851 if (m != nullptr) {
3852 assert(m->is_method(), "");
3853 m->print_short_name(&st);
3854 }
3855 return st.as_string();
3856 }
3857 case relocInfo::static_call_type: {
3858 stringStream st;
3859 st.print_raw("static_call");
3860 static_call_Relocation* r = iter.static_call_reloc();
3861 Method* m = r->method_value();
3862 if (m != nullptr) {
3863 assert(m->is_method(), "");
3864 m->print_short_name(&st);
3865 }
3866 return st.as_string();
3867 }
3868 case relocInfo::static_stub_type: return "static_stub";
3869 case relocInfo::external_word_type: return "external_word";
3870 case relocInfo::internal_word_type: return "internal_word";
3871 case relocInfo::section_word_type: return "section_word";
3872 case relocInfo::poll_type: return "poll";
3873 case relocInfo::poll_return_type: return "poll_return";
3874 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3875 case relocInfo::entry_guard_type: return "entry_guard";
3876 case relocInfo::post_call_nop_type: return "post_call_nop";
3877 case relocInfo::barrier_type: {
3878 barrier_Relocation* const reloc = iter.barrier_reloc();
3879 stringStream st;
3880 st.print("barrier format=%d", reloc->format());
3881 return st.as_string();
3882 }
3883
3884 case relocInfo::type_mask: return "type_bit_mask";
3885
3886 default: {
3887 stringStream st;
3888 st.print("unknown relocInfo=%d", (int) iter.type());
3889 return st.as_string();
3890 }
3891 }
3892 }
3893 return have_one ? "other" : nullptr;
3894 }
3895
3896 // Return the last scope in (begin..end]
3897 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3898 PcDesc* p = pc_desc_near(begin+1);
3899 if (p != nullptr && p->real_pc(this) <= end) {
3900 return new ScopeDesc(this, p);
3901 }
3902 return nullptr;
3903 }
3904
3905 const char* nmethod::nmethod_section_label(address pos) const {
3906 const char* label = nullptr;
3907 if (pos == code_begin()) label = "[Instructions begin]";
3908 if (pos == entry_point()) label = "[Entry Point]";
3909 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3910 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3911 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3912 // Check stub_code before checking exception_handler or deopt_handler.
3913 if (pos == this->stub_begin()) label = "[Stub Code]";
3914 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3915 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3916 return label;
3917 }
3918
3919 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3920 if (print_section_labels) {
3921 const char* label = nmethod_section_label(block_begin);
3922 if (label != nullptr) {
3923 stream->bol();
3924 stream->print_cr("%s", label);
3925 }
3926 }
3927
3928 if (block_begin == entry_point()) {
3929 Method* m = method();
3930 if (m != nullptr) {
3931 stream->print(" # ");
3932 m->print_value_on(stream);
3933 stream->cr();
3934 }
3935 if (m != nullptr && !is_osr_method()) {
3936 ResourceMark rm;
3937 int sizeargs = m->size_of_parameters();
3938 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3939 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3940 {
3941 int sig_index = 0;
3942 if (!m->is_static())
3943 sig_bt[sig_index++] = T_OBJECT; // 'this'
3944 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3945 BasicType t = ss.type();
3946 sig_bt[sig_index++] = t;
3947 if (type2size[t] == 2) {
3948 sig_bt[sig_index++] = T_VOID;
3949 } else {
3950 assert(type2size[t] == 1, "size is 1 or 2");
3951 }
3952 }
3953 assert(sig_index == sizeargs, "");
3954 }
3955 const char* spname = "sp"; // make arch-specific?
3956 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3957 int stack_slot_offset = this->frame_size() * wordSize;
3958 int tab1 = 14, tab2 = 24;
3959 int sig_index = 0;
3960 int arg_index = (m->is_static() ? 0 : -1);
3961 bool did_old_sp = false;
3962 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3963 bool at_this = (arg_index == -1);
3964 bool at_old_sp = false;
3965 BasicType t = (at_this ? T_OBJECT : ss.type());
3966 assert(t == sig_bt[sig_index], "sigs in sync");
3967 if (at_this)
3968 stream->print(" # this: ");
3969 else
3970 stream->print(" # parm%d: ", arg_index);
3971 stream->move_to(tab1);
3972 VMReg fst = regs[sig_index].first();
3973 VMReg snd = regs[sig_index].second();
3974 if (fst->is_reg()) {
3975 stream->print("%s", fst->name());
3976 if (snd->is_valid()) {
3977 stream->print(":%s", snd->name());
3978 }
3979 } else if (fst->is_stack()) {
3980 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3981 if (offset == stack_slot_offset) at_old_sp = true;
3982 stream->print("[%s+0x%x]", spname, offset);
3983 } else {
3984 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3985 }
3986 stream->print(" ");
3987 stream->move_to(tab2);
3988 stream->print("= ");
3989 if (at_this) {
3990 m->method_holder()->print_value_on(stream);
3991 } else {
3992 bool did_name = false;
3993 if (!at_this && ss.is_reference()) {
3994 Symbol* name = ss.as_symbol();
3995 name->print_value_on(stream);
3996 did_name = true;
3997 }
3998 if (!did_name)
3999 stream->print("%s", type2name(t));
4000 }
4001 if (at_old_sp) {
4002 stream->print(" (%s of caller)", spname);
4003 did_old_sp = true;
4004 }
4005 stream->cr();
4006 sig_index += type2size[t];
4007 arg_index += 1;
4008 if (!at_this) ss.next();
4009 }
4010 if (!did_old_sp) {
4011 stream->print(" # ");
4012 stream->move_to(tab1);
4013 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4014 stream->print(" (%s of caller)", spname);
4015 stream->cr();
4016 }
4017 }
4018 }
4019 }
4020
4021 // Returns whether this nmethod has code comments.
4022 bool nmethod::has_code_comment(address begin, address end) {
4023 // scopes?
4024 ScopeDesc* sd = scope_desc_in(begin, end);
4025 if (sd != nullptr) return true;
4026
4027 // relocations?
4028 const char* str = reloc_string_for(begin, end);
4029 if (str != nullptr) return true;
4030
4031 // implicit exceptions?
4032 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4033 if (cont_offset != 0) return true;
4034
4035 return false;
4036 }
4037
4038 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4039 ImplicitExceptionTable implicit_table(this);
4040 int pc_offset = (int)(begin - code_begin());
4041 int cont_offset = implicit_table.continuation_offset(pc_offset);
4042 bool oop_map_required = false;
4043 if (cont_offset != 0) {
4044 st->move_to(column, 6, 0);
4045 if (pc_offset == cont_offset) {
4046 st->print("; implicit exception: deoptimizes");
4047 oop_map_required = true;
4048 } else {
4049 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4050 }
4051 }
4052
4053 // Find an oopmap in (begin, end]. We use the odd half-closed
4054 // interval so that oop maps and scope descs which are tied to the
4055 // byte after a call are printed with the call itself. OopMaps
4056 // associated with implicit exceptions are printed with the implicit
4057 // instruction.
4058 address base = code_begin();
4059 ImmutableOopMapSet* oms = oop_maps();
4060 if (oms != nullptr) {
4061 for (int i = 0, imax = oms->count(); i < imax; i++) {
4062 const ImmutableOopMapPair* pair = oms->pair_at(i);
4063 const ImmutableOopMap* om = pair->get_from(oms);
4064 address pc = base + pair->pc_offset();
4065 if (pc >= begin) {
4066 #if INCLUDE_JVMCI
4067 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4068 #else
4069 bool is_implicit_deopt = false;
4070 #endif
4071 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4072 st->move_to(column, 6, 0);
4073 st->print("; ");
4074 om->print_on(st);
4075 oop_map_required = false;
4076 }
4077 }
4078 if (pc > end) {
4079 break;
4080 }
4081 }
4082 }
4083 assert(!oop_map_required, "missed oopmap");
4084
4085 Thread* thread = Thread::current();
4086
4087 // Print any debug info present at this pc.
4088 ScopeDesc* sd = scope_desc_in(begin, end);
4089 if (sd != nullptr) {
4090 st->move_to(column, 6, 0);
4091 if (sd->bci() == SynchronizationEntryBCI) {
4092 st->print(";*synchronization entry");
4093 } else if (sd->bci() == AfterBci) {
4094 st->print(";* method exit (unlocked if synchronized)");
4095 } else if (sd->bci() == UnwindBci) {
4096 st->print(";* unwind (locked if synchronized)");
4097 } else if (sd->bci() == AfterExceptionBci) {
4098 st->print(";* unwind (unlocked if synchronized)");
4099 } else if (sd->bci() == UnknownBci) {
4100 st->print(";* unknown");
4101 } else if (sd->bci() == InvalidFrameStateBci) {
4102 st->print(";* invalid frame state");
4103 } else {
4104 if (sd->method() == nullptr) {
4105 st->print("method is nullptr");
4106 } else if (sd->method()->is_native()) {
4107 st->print("method is native");
4108 } else {
4109 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4110 st->print(";*%s", Bytecodes::name(bc));
4111 switch (bc) {
4112 case Bytecodes::_invokevirtual:
4113 case Bytecodes::_invokespecial:
4114 case Bytecodes::_invokestatic:
4115 case Bytecodes::_invokeinterface:
4116 {
4117 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4118 st->print(" ");
4119 if (invoke.name() != nullptr)
4120 invoke.name()->print_symbol_on(st);
4121 else
4122 st->print("<UNKNOWN>");
4123 break;
4124 }
4125 case Bytecodes::_getfield:
4126 case Bytecodes::_putfield:
4127 case Bytecodes::_getstatic:
4128 case Bytecodes::_putstatic:
4129 {
4130 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4131 st->print(" ");
4132 if (field.name() != nullptr)
4133 field.name()->print_symbol_on(st);
4134 else
4135 st->print("<UNKNOWN>");
4136 }
4137 default:
4138 break;
4139 }
4140 }
4141 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4142 }
4143
4144 // Print all scopes
4145 for (;sd != nullptr; sd = sd->sender()) {
4146 st->move_to(column, 6, 0);
4147 st->print("; -");
4148 if (sd->should_reexecute()) {
4149 st->print(" (reexecute)");
4150 }
4151 if (sd->method() == nullptr) {
4152 st->print("method is nullptr");
4153 } else {
4154 sd->method()->print_short_name(st);
4155 }
4156 int lineno = sd->method()->line_number_from_bci(sd->bci());
4157 if (lineno != -1) {
4158 st->print("@%d (line %d)", sd->bci(), lineno);
4159 } else {
4160 st->print("@%d", sd->bci());
4161 }
4162 st->cr();
4163 }
4164 }
4165
4166 // Print relocation information
4167 // Prevent memory leak: allocating without ResourceMark.
4168 ResourceMark rm;
4169 const char* str = reloc_string_for(begin, end);
4170 if (str != nullptr) {
4171 if (sd != nullptr) st->cr();
4172 st->move_to(column, 6, 0);
4173 st->print("; {%s}", str);
4174 }
4175 }
4176
4177 #endif
4178
4179 address nmethod::call_instruction_address(address pc) const {
4180 if (NativeCall::is_call_before(pc)) {
4181 NativeCall *ncall = nativeCall_before(pc);
4182 return ncall->instruction_address();
4183 }
4184 return nullptr;
4185 }
4186
4187 void nmethod::print_value_on_impl(outputStream* st) const {
4188 st->print_cr("nmethod");
4189 #if defined(SUPPORT_DATA_STRUCTS)
4190 print_on_with_msg(st, nullptr);
4191 #endif
4192 }
4193
4194 #ifndef PRODUCT
4195
4196 void nmethod::print_calls(outputStream* st) {
4197 RelocIterator iter(this);
4198 while (iter.next()) {
4199 switch (iter.type()) {
4200 case relocInfo::virtual_call_type: {
4201 CompiledICLocker ml_verify(this);
4202 CompiledIC_at(&iter)->print();
4203 break;
4204 }
4205 case relocInfo::static_call_type:
4206 case relocInfo::opt_virtual_call_type:
4207 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4208 CompiledDirectCall::at(iter.reloc())->print();
4209 break;
4210 default:
4211 break;
4212 }
4213 }
4214 }
4215
4216 void nmethod::print_statistics() {
4217 ttyLocker ttyl;
4218 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4219 native_nmethod_stats.print_native_nmethod_stats();
4220 #ifdef COMPILER1
4221 c1_java_nmethod_stats.print_nmethod_stats("C1");
4222 #endif
4223 #ifdef COMPILER2
4224 c2_java_nmethod_stats.print_nmethod_stats("C2");
4225 #endif
4226 #if INCLUDE_JVMCI
4227 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4228 #endif
4229 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4230 DebugInformationRecorder::print_statistics();
4231 pc_nmethod_stats.print_pc_stats();
4232 Dependencies::print_statistics();
4233 ExternalsRecorder::print_statistics();
4234 if (xtty != nullptr) xtty->tail("statistics");
4235 }
4236
4237 #endif // !PRODUCT
4238
4239 #if INCLUDE_JVMCI
4240 void nmethod::update_speculation(JavaThread* thread) {
4241 jlong speculation = thread->pending_failed_speculation();
4242 if (speculation != 0) {
4243 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4244 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4245 thread->set_pending_failed_speculation(0);
4246 }
4247 }
4248
4249 const char* nmethod::jvmci_name() {
4250 if (jvmci_nmethod_data() != nullptr) {
4251 return jvmci_nmethod_data()->name();
4252 }
4253 return nullptr;
4254 }
4255 #endif
4256
4257 void nmethod::prepare_for_archiving_impl() {
4258 CodeBlob::prepare_for_archiving_impl();
4259 _deoptimization_generation = 0;
4260 _gc_epoch = 0;
4261 _method_profiling_count = 0;
4262 _osr_link = nullptr;
4263 _method = nullptr;
4264 _immutable_data = nullptr;
4265 _pc_desc_container = nullptr;
4266 _exception_cache = nullptr;
4267 _gc_data = nullptr;
4268 _oops_do_mark_link = nullptr;
4269 _compiled_ic_data = nullptr;
4270 _osr_entry_point = nullptr;
4271 _compile_id = -1;
4272 _deoptimization_status = not_marked;
4273 _is_unloading_state = 0;
4274 _state = not_installed;
4275 }