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 void nmethod::restore_from_archive(nmethod* archived_nm,
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 #ifndef PRODUCT
1265 AsmRemarks& archived_asm_remarks,
1266 DbgStrings& archived_dbg_strings,
1267 #endif /* PRODUCT */
1268 AOTCodeReader* aot_code_reader)
1269 {
1270 archived_nm->copy_to((address)this);
1271 set_name("nmethod");
1272 set_method(method());
1273
1274 _compile_id = compile_id;
1275 // allocate _mutable_data before copying relocation data because relocation data is now stored as part of mutable data area
1276 if (archived_nm->mutable_data_size() > 0) {
1277 _mutable_data = (address)os::malloc(archived_nm->mutable_data_size(), mtCode);
1278 if (_mutable_data == nullptr) {
1279 vm_exit_out_of_memory(archived_nm->mutable_data_size(), OOM_MALLOC_ERROR, "codebuffer: no space for mutable data");
1280 }
1281 }
1282 memcpy((address)relocation_begin(), reloc_data, archived_nm->relocation_size());
1283 set_oop_maps(oop_maps);
1284 set_immutable_data(immutable_data);
1285 copy_values(&oop_list);
1286 copy_values(&metadata_list);
1287
1288 aot_code_reader->apply_relocations(this, reloc_imm_oop_list, reloc_imm_metadata_list);
1289
1290 #ifndef PRODUCT
1291 AsmRemarks::init(asm_remarks());
1292 use_remarks(archived_asm_remarks);
1293 archived_asm_remarks.clear();
1294 DbgStrings::init(dbg_strings());
1295 use_strings(archived_dbg_strings);
1296 archived_dbg_strings.clear();
1297 #endif /* PRODUCT */
1298
1299 // Flush the code block
1300 ICache::invalidate_range(code_begin(), code_size());
1301
1302 // Create cache after PcDesc data is copied - it will be used to initialize cache
1303 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1304
1305 set_aot_code_entry(aot_code_reader->aot_code_entry());
1306
1307 post_init();
1308 }
1309
1310 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1311 const methodHandle& method,
1312 AbstractCompiler* compiler,
1313 int compile_id,
1314 address reloc_data,
1315 GrowableArray<Handle>& oop_list,
1316 GrowableArray<Metadata*>& metadata_list,
1317 ImmutableOopMapSet* oop_maps,
1318 address immutable_data,
1319 GrowableArray<Handle>& reloc_imm_oop_list,
1320 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1321 #ifndef PRODUCT
1322 AsmRemarks& asm_remarks,
1323 DbgStrings& dbg_strings,
1324 #endif /* PRODUCT */
1325 AOTCodeReader* aot_code_reader)
1326 {
1327 nmethod* nm = nullptr;
1328 int nmethod_size = archived_nm->size();
1329 // create nmethod
1330 {
1331 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1332 nm = (nmethod *)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1333 if (nm != nullptr) {
1334 nm->restore_from_archive(archived_nm,
1335 method,
1336 compile_id,
1337 reloc_data,
1338 oop_list,
1339 metadata_list,
1340 oop_maps,
1341 immutable_data,
1342 reloc_imm_oop_list,
1343 reloc_imm_metadata_list,
1344 NOT_PRODUCT_ARG(asm_remarks)
1345 NOT_PRODUCT_ARG(dbg_strings)
1346 aot_code_reader);
1347 nm->record_nmethod_dependency();
1348 NOT_PRODUCT(note_java_nmethod(nm));
1349 }
1350 }
1351 // Do verification and logging outside CodeCache_lock.
1352 if (nm != nullptr) {
1353 #ifdef ASSERT
1354 LogTarget(Debug, aot, codecache, nmethod) log;
1355 if (log.is_enabled()) {
1356 LogStream out(log);
1357 out.print_cr("== new_nmethod 2");
1358 FlagSetting fs(PrintRelocations, true);
1359 nm->print_on_impl(&out);
1360 nm->decode(&out);
1361 }
1362 #endif
1363 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1364 DEBUG_ONLY(nm->verify();)
1365 nm->log_new_nmethod();
1366 }
1367 return nm;
1368 }
1369
1370 // Fill in default values for various fields
1371 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1372 // avoid uninitialized fields, even for short time periods
1373 _exception_cache = nullptr;
1374 _gc_data = nullptr;
1375 _oops_do_mark_link = nullptr;
1376 _compiled_ic_data = nullptr;
1377
1378 _is_unloading_state = 0;
1379 _state = not_installed;
1380
1381 _has_unsafe_access = 0;
1382 _has_method_handle_invokes = 0;
1383 _has_wide_vectors = 0;
1384 _has_monitors = 0;
1385 _has_scoped_access = 0;
1386 _has_flushed_dependencies = 0;
1387 _is_unlinked = 0;
1388 _load_reported = 0; // jvmti state
1389 _preloaded = 0;
1390 _has_clinit_barriers = 0;
1391
1392 _used = false;
1393 _deoptimization_status = not_marked;
1394
1395 // SECT_CONSTS is first in code buffer so the offset should be 0.
1396 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1397 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1398
1399 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1400
1401 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1402 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1403
1404 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1405 }
1406
1407 // Post initialization
1408 void nmethod::post_init() {
1409 clear_unloading_state();
1410
1411 finalize_relocations();
1412
1413 Universe::heap()->register_nmethod(this);
1414 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1415
1416 CodeCache::commit(this);
1417 }
1418
1419 // For native wrappers
1420 nmethod::nmethod(
1421 Method* method,
1422 CompilerType type,
1423 int nmethod_size,
1424 int compile_id,
1425 CodeOffsets* offsets,
1426 CodeBuffer* code_buffer,
1427 int frame_size,
1428 ByteSize basic_lock_owner_sp_offset,
1429 ByteSize basic_lock_sp_offset,
1430 OopMapSet* oop_maps,
1431 int mutable_data_size)
1432 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1433 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1434 _deoptimization_generation(0),
1435 _gc_epoch(CodeCache::gc_epoch()),
1436 _method(method),
1437 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1438 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1439 {
1440 {
1441 DEBUG_ONLY(NoSafepointVerifier nsv;)
1442 assert_locked_or_safepoint(CodeCache_lock);
1443
1444 init_defaults(code_buffer, offsets);
1445
1446 _osr_entry_point = nullptr;
1447 _pc_desc_container = nullptr;
1448 _entry_bci = InvocationEntryBci;
1449 _compile_id = compile_id;
1450 _comp_level = CompLevel_none;
1451 _compiler_type = type;
1452 _orig_pc_offset = 0;
1453 _num_stack_arg_slots = 0;
1454
1455 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1456 // Continuation enter intrinsic
1457 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1458 } else {
1459 _exception_offset = 0;
1460 }
1461 // Native wrappers do not have deopt handlers. Make the values
1462 // something that will never match a pc like the nmethod vtable entry
1463 _deopt_handler_offset = 0;
1464 _deopt_mh_handler_offset = 0;
1465 _aot_code_entry = nullptr;
1466 _method_profiling_count = 0;
1467 _unwind_handler_offset = 0;
1468
1469 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1470 uint16_t metadata_size;
1471 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1472 JVMCI_ONLY( _metadata_size = metadata_size; )
1473 assert(_mutable_data_size == _relocation_size + metadata_size,
1474 "wrong mutable data size: %d != %d + %d",
1475 _mutable_data_size, _relocation_size, metadata_size);
1476
1477 // native wrapper does not have read-only data but we need unique not null address
1478 _immutable_data = blob_end();
1479 _immutable_data_size = 0;
1480 _nul_chk_table_offset = 0;
1481 _handler_table_offset = 0;
1482 _scopes_pcs_offset = 0;
1483 _scopes_data_offset = 0;
1484 #if INCLUDE_JVMCI
1485 _speculations_offset = 0;
1486 #endif
1487
1488 code_buffer->copy_code_and_locs_to(this);
1489 code_buffer->copy_values_to(this);
1490
1491 post_init();
1492 }
1493
1494 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1495 ttyLocker ttyl; // keep the following output all in one block
1496 // This output goes directly to the tty, not the compiler log.
1497 // To enable tools to match it up with the compilation activity,
1498 // be sure to tag this tty output with the compile ID.
1499 if (xtty != nullptr) {
1500 xtty->begin_head("print_native_nmethod");
1501 xtty->method(_method);
1502 xtty->stamp();
1503 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1504 }
1505 // Print the header part, then print the requested information.
1506 // This is both handled in decode2(), called via print_code() -> decode()
1507 if (PrintNativeNMethods) {
1508 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1509 print_code();
1510 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1511 #if defined(SUPPORT_DATA_STRUCTS)
1512 if (AbstractDisassembler::show_structs()) {
1513 if (oop_maps != nullptr) {
1514 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1515 oop_maps->print_on(tty);
1516 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1517 }
1518 }
1519 #endif
1520 } else {
1521 print(); // print the header part only.
1522 }
1523 #if defined(SUPPORT_DATA_STRUCTS)
1524 if (AbstractDisassembler::show_structs()) {
1525 if (PrintRelocations) {
1526 print_relocations_on(tty);
1527 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1528 }
1529 }
1530 #endif
1531 if (xtty != nullptr) {
1532 xtty->tail("print_native_nmethod");
1533 }
1534 }
1535 }
1536
1537 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1538 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1539 }
1540
1541 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1542 // Try MethodNonProfiled and MethodProfiled.
1543 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1544 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1545 // Try NonNMethod or give up.
1546 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1547 }
1548
1549 // For normal JIT compiled code
1550 nmethod::nmethod(
1551 Method* method,
1552 CompilerType type,
1553 int nmethod_size,
1554 int immutable_data_size,
1555 int mutable_data_size,
1556 int compile_id,
1557 int entry_bci,
1558 address immutable_data,
1559 CodeOffsets* offsets,
1560 int orig_pc_offset,
1561 DebugInformationRecorder* debug_info,
1562 Dependencies* dependencies,
1563 CodeBuffer *code_buffer,
1564 int frame_size,
1565 OopMapSet* oop_maps,
1566 ExceptionHandlerTable* handler_table,
1567 ImplicitExceptionTable* nul_chk_table,
1568 AbstractCompiler* compiler,
1569 CompLevel comp_level
1570 , AOTCodeEntry* aot_code_entry
1571 #if INCLUDE_JVMCI
1572 , char* speculations,
1573 int speculations_len,
1574 JVMCINMethodData* jvmci_data
1575 #endif
1576 )
1577 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1578 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1579 _deoptimization_generation(0),
1580 _gc_epoch(CodeCache::gc_epoch()),
1581 _method(method),
1582 _osr_link(nullptr)
1583 {
1584 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1585 {
1586 DEBUG_ONLY(NoSafepointVerifier nsv;)
1587 assert_locked_or_safepoint(CodeCache_lock);
1588
1589 init_defaults(code_buffer, offsets);
1590 _aot_code_entry = aot_code_entry;
1591 _method_profiling_count = 0;
1592
1593 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1594 _entry_bci = entry_bci;
1595 _compile_id = compile_id;
1596 _comp_level = comp_level;
1597 _compiler_type = type;
1598 _orig_pc_offset = orig_pc_offset;
1599
1600 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1601
1602 set_ctable_begin(header_begin() + content_offset());
1603
1604 #if INCLUDE_JVMCI
1605 if (compiler->is_jvmci()) {
1606 // JVMCI might not produce any stub sections
1607 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1608 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1609 } else {
1610 _exception_offset = -1;
1611 }
1612 if (offsets->value(CodeOffsets::Deopt) != -1) {
1613 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1614 } else {
1615 _deopt_handler_offset = -1;
1616 }
1617 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1618 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
1619 } else {
1620 _deopt_mh_handler_offset = -1;
1621 }
1622 } else
1623 #endif
1624 {
1625 // Exception handler and deopt handler are in the stub section
1626 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1627 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1628
1629 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1630 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1631 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1632 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
1633 } else {
1634 _deopt_mh_handler_offset = -1;
1635 }
1636 }
1637 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1638 // C1 generates UnwindHandler at the end of instructions section.
1639 // Calculate positive offset as distance between the start of stubs section
1640 // (which is also the end of instructions section) and the start of the handler.
1641 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1642 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1643 } else {
1644 _unwind_handler_offset = -1;
1645 }
1646
1647 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1648 uint16_t metadata_size;
1649 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1650 JVMCI_ONLY( _metadata_size = metadata_size; )
1651 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1652 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1653 "wrong mutable data size: %d != %d + %d + %d",
1654 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1655 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1656 nmethod_size, (int)(code_end() - header_begin()));
1657
1658 _immutable_data_size = immutable_data_size;
1659 if (immutable_data_size > 0) {
1660 assert(immutable_data != nullptr, "required");
1661 _immutable_data = immutable_data;
1662 } else {
1663 // We need unique not null address
1664 _immutable_data = blob_end();
1665 }
1666 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1667 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1668 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1669 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1670
1671 #if INCLUDE_JVMCI
1672 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1673 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); )
1674 #else
1675 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); )
1676 #endif
1677 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1678 immutable_data_end_offset, immutable_data_size);
1679
1680 // Copy code and relocation info
1681 code_buffer->copy_code_and_locs_to(this);
1682 // Copy oops and metadata
1683 code_buffer->copy_values_to(this);
1684 dependencies->copy_to(this);
1685 // Copy PcDesc and ScopeDesc data
1686 debug_info->copy_to(this);
1687
1688 // Create cache after PcDesc data is copied - it will be used to initialize cache
1689 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1690
1691 #if INCLUDE_JVMCI
1692 if (compiler->is_jvmci()) {
1693 // Initialize the JVMCINMethodData object inlined into nm
1694 jvmci_nmethod_data()->copy(jvmci_data);
1695 }
1696 #endif
1697
1698 // Copy contents of ExceptionHandlerTable to nmethod
1699 handler_table->copy_to(this);
1700 nul_chk_table->copy_to(this);
1701
1702 #if INCLUDE_JVMCI
1703 // Copy speculations to nmethod
1704 if (speculations_size() != 0) {
1705 memcpy(speculations_begin(), speculations, speculations_len);
1706 }
1707 #endif
1708
1709 post_init();
1710
1711 // we use the information of entry points to find out if a method is
1712 // static or non static
1713 assert(compiler->is_c2() || compiler->is_jvmci() ||
1714 _method->is_static() == (entry_point() == verified_entry_point()),
1715 " entry points must be same for static methods and vice versa");
1716 }
1717 }
1718
1719 // Print a short set of xml attributes to identify this nmethod. The
1720 // output should be embedded in some other element.
1721 void nmethod::log_identity(xmlStream* log) const {
1722 assert(log->inside_attrs_or_error(), "printing attributes");
1723 log->print(" code_compile_id='%d'", compile_id());
1724 const char* nm_kind = compile_kind();
1725 if (nm_kind != nullptr) log->print(" code_compile_kind='%s'", nm_kind);
1726 log->print(" code_compiler='%s'", compiler_name());
1727 if (TieredCompilation) {
1728 log->print(" code_compile_level='%d'", comp_level());
1729 }
1730 #if INCLUDE_JVMCI
1731 if (jvmci_nmethod_data() != nullptr) {
1732 const char* jvmci_name = jvmci_nmethod_data()->name();
1733 if (jvmci_name != nullptr) {
1734 log->print(" jvmci_mirror_name='");
1735 log->text("%s", jvmci_name);
1736 log->print("'");
1737 }
1738 }
1739 #endif
1740 }
1741
1742
1743 #define LOG_OFFSET(log, name) \
1744 if (p2i(name##_end()) - p2i(name##_begin())) \
1745 log->print(" " XSTR(name) "_offset='%zd'" , \
1746 p2i(name##_begin()) - p2i(this))
1747
1748
1749 void nmethod::log_new_nmethod() const {
1750 if (LogCompilation && xtty != nullptr) {
1751 ttyLocker ttyl;
1752 xtty->begin_elem("nmethod");
1753 log_identity(xtty);
1754 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1755 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1756
1757 LOG_OFFSET(xtty, relocation);
1758 LOG_OFFSET(xtty, consts);
1759 LOG_OFFSET(xtty, insts);
1760 LOG_OFFSET(xtty, stub);
1761 LOG_OFFSET(xtty, scopes_data);
1762 LOG_OFFSET(xtty, scopes_pcs);
1763 LOG_OFFSET(xtty, dependencies);
1764 LOG_OFFSET(xtty, handler_table);
1765 LOG_OFFSET(xtty, nul_chk_table);
1766 LOG_OFFSET(xtty, oops);
1767 LOG_OFFSET(xtty, metadata);
1768
1769 xtty->method(method());
1770 xtty->stamp();
1771 xtty->end_elem();
1772 }
1773 }
1774
1775 #undef LOG_OFFSET
1776
1777
1778 // Print out more verbose output usually for a newly created nmethod.
1779 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1780 if (st != nullptr) {
1781 ttyLocker ttyl;
1782 if (WizardMode) {
1783 CompileTask::print(st, this, msg, /*short_form:*/ true);
1784 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1785 } else {
1786 CompileTask::print(st, this, msg, /*short_form:*/ false);
1787 }
1788 }
1789 }
1790
1791 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1792 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1793 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1794 print_nmethod(printnmethods);
1795 }
1796 }
1797
1798 void nmethod::print_nmethod(bool printmethod) {
1799 // Enter a critical section to prevent a race with deopts that patch code and updates the relocation info.
1800 // Unfortunately, we have to lock the NMethodState_lock before the tty lock due to the deadlock rules and
1801 // cannot lock in a more finely grained manner.
1802 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
1803 ttyLocker ttyl; // keep the following output all in one block
1804 if (xtty != nullptr) {
1805 xtty->begin_head("print_nmethod");
1806 log_identity(xtty);
1807 xtty->stamp();
1808 xtty->end_head();
1809 }
1810 // Print the header part, then print the requested information.
1811 // This is both handled in decode2().
1812 if (printmethod) {
1813 ResourceMark m;
1814 if (is_compiled_by_c1()) {
1815 tty->cr();
1816 tty->print_cr("============================= C1-compiled nmethod ==============================");
1817 }
1818 if (is_compiled_by_jvmci()) {
1819 tty->cr();
1820 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1821 }
1822 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1823 decode2(tty);
1824 #if defined(SUPPORT_DATA_STRUCTS)
1825 if (AbstractDisassembler::show_structs()) {
1826 // Print the oops from the underlying CodeBlob as well.
1827 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1828 print_oops(tty);
1829 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1830 print_metadata(tty);
1831 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1832 print_pcs_on(tty);
1833 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1834 if (oop_maps() != nullptr) {
1835 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1836 oop_maps()->print_on(tty);
1837 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1838 }
1839 }
1840 #endif
1841 } else {
1842 print(); // print the header part only.
1843 }
1844
1845 #if defined(SUPPORT_DATA_STRUCTS)
1846 if (AbstractDisassembler::show_structs()) {
1847 methodHandle mh(Thread::current(), _method);
1848 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1849 print_scopes();
1850 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1851 }
1852 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1853 print_relocations_on(tty);
1854 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1855 }
1856 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1857 print_dependencies_on(tty);
1858 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1859 }
1860 if (printmethod || PrintExceptionHandlers) {
1861 print_handler_table();
1862 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1863 print_nul_chk_table();
1864 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1865 }
1866
1867 if (printmethod) {
1868 print_recorded_oops();
1869 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1870 print_recorded_metadata();
1871 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1872 }
1873 }
1874 #endif
1875
1876 if (xtty != nullptr) {
1877 xtty->tail("print_nmethod");
1878 }
1879 }
1880
1881
1882 // Promote one word from an assembly-time handle to a live embedded oop.
1883 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1884 if (handle == nullptr ||
1885 // As a special case, IC oops are initialized to 1 or -1.
1886 handle == (jobject) Universe::non_oop_word()) {
1887 *(void**)dest = handle;
1888 } else {
1889 *dest = JNIHandles::resolve_non_null(handle);
1890 }
1891 }
1892
1893 void nmethod::copy_values(GrowableArray<Handle>* array) {
1894 int length = array->length();
1895 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1896 oop* dest = oops_begin();
1897 for (int index = 0 ; index < length; index++) {
1898 dest[index] = array->at(index)();
1899 }
1900 }
1901
1902 // Have to have the same name because it's called by a template
1903 void nmethod::copy_values(GrowableArray<jobject>* array) {
1904 int length = array->length();
1905 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1906 oop* dest = oops_begin();
1907 for (int index = 0 ; index < length; index++) {
1908 initialize_immediate_oop(&dest[index], array->at(index));
1909 }
1910
1911 // Now we can fix up all the oops in the code. We need to do this
1912 // in the code because the assembler uses jobjects as placeholders.
1913 // The code and relocations have already been initialized by the
1914 // CodeBlob constructor, so it is valid even at this early point to
1915 // iterate over relocations and patch the code.
1916 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1917 }
1918
1919 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1920 int length = array->length();
1921 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1922 Metadata** dest = metadata_begin();
1923 for (int index = 0 ; index < length; index++) {
1924 dest[index] = array->at(index);
1925 }
1926 }
1927
1928 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1929 // re-patch all oop-bearing instructions, just in case some oops moved
1930 RelocIterator iter(this, begin, end);
1931 while (iter.next()) {
1932 if (iter.type() == relocInfo::oop_type) {
1933 oop_Relocation* reloc = iter.oop_reloc();
1934 if (initialize_immediates && reloc->oop_is_immediate()) {
1935 oop* dest = reloc->oop_addr();
1936 jobject obj = *reinterpret_cast<jobject*>(dest);
1937 initialize_immediate_oop(dest, obj);
1938 }
1939 // Refresh the oop-related bits of this instruction.
1940 reloc->fix_oop_relocation();
1941 } else if (iter.type() == relocInfo::metadata_type) {
1942 metadata_Relocation* reloc = iter.metadata_reloc();
1943 reloc->fix_metadata_relocation();
1944 }
1945 }
1946 }
1947
1948 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
1949 RelocIterator iter(this);
1950 while (iter.next()) {
1951 if (iter.type() == relocInfo::oop_type) {
1952 oop_Relocation* reloc = iter.oop_reloc();
1953 if (reloc->oop_is_immediate()) {
1954 oop dest = reloc->oop_value();
1955 Handle h(thread, dest);
1956 oop_list.append(h);
1957 }
1958 } else if (iter.type() == relocInfo::metadata_type) {
1959 metadata_Relocation* reloc = iter.metadata_reloc();
1960 if (reloc->metadata_is_immediate()) {
1961 Metadata* m = reloc->metadata_value();
1962 metadata_list.append(m);
1963 }
1964 }
1965 }
1966 }
1967
1968 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1969 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1970 intptr_t cbaddr = (intptr_t) nm;
1971 intptr_t offset = ((intptr_t) pc) - cbaddr;
1972
1973 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1974 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1975 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1976 } else if (!nop->patch(oopmap_slot, offset)) {
1977 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1978 }
1979 }
1980
1981 void nmethod::finalize_relocations() {
1982 NoSafepointVerifier nsv;
1983
1984 GrowableArray<NativeMovConstReg*> virtual_call_data;
1985
1986 // Make sure that post call nops fill in nmethod offsets eagerly so
1987 // we don't have to race with deoptimization
1988 RelocIterator iter(this);
1989 while (iter.next()) {
1990 if (iter.type() == relocInfo::virtual_call_type) {
1991 virtual_call_Relocation* r = iter.virtual_call_reloc();
1992 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1993 virtual_call_data.append(value);
1994 } else if (iter.type() == relocInfo::post_call_nop_type) {
1995 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1996 address pc = reloc->addr();
1997 install_post_call_nop_displacement(this, pc);
1998 }
1999 }
2000
2001 if (virtual_call_data.length() > 0) {
2002 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
2003 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
2004 CompiledICData* next_data = _compiled_ic_data;
2005
2006 for (NativeMovConstReg* value : virtual_call_data) {
2007 value->set_data((intptr_t)next_data);
2008 next_data++;
2009 }
2010 }
2011 }
2012
2013 void nmethod::make_deoptimized() {
2014 if (!Continuations::enabled()) {
2015 // Don't deopt this again.
2016 set_deoptimized_done();
2017 return;
2018 }
2019
2020 assert(method() == nullptr || can_be_deoptimized(), "");
2021
2022 CompiledICLocker ml(this);
2023 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2024
2025 // If post call nops have been already patched, we can just bail-out.
2026 if (has_been_deoptimized()) {
2027 return;
2028 }
2029
2030 ResourceMark rm;
2031 RelocIterator iter(this, oops_reloc_begin());
2032
2033 while (iter.next()) {
2034
2035 switch (iter.type()) {
2036 case relocInfo::virtual_call_type: {
2037 CompiledIC *ic = CompiledIC_at(&iter);
2038 address pc = ic->end_of_call();
2039 NativePostCallNop* nop = nativePostCallNop_at(pc);
2040 if (nop != nullptr) {
2041 nop->make_deopt();
2042 }
2043 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2044 break;
2045 }
2046 case relocInfo::static_call_type:
2047 case relocInfo::opt_virtual_call_type: {
2048 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2049 address pc = csc->end_of_call();
2050 NativePostCallNop* nop = nativePostCallNop_at(pc);
2051 //tty->print_cr(" - static pc %p", pc);
2052 if (nop != nullptr) {
2053 nop->make_deopt();
2054 }
2055 // We can't assert here, there are some calls to stubs / runtime
2056 // that have reloc data and doesn't have a post call NOP.
2057 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2058 break;
2059 }
2060 default:
2061 break;
2062 }
2063 }
2064 // Don't deopt this again.
2065 set_deoptimized_done();
2066 }
2067
2068 void nmethod::verify_clean_inline_caches() {
2069 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2070
2071 ResourceMark rm;
2072 RelocIterator iter(this, oops_reloc_begin());
2073 while(iter.next()) {
2074 switch(iter.type()) {
2075 case relocInfo::virtual_call_type: {
2076 CompiledIC *ic = CompiledIC_at(&iter);
2077 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2078 assert(cb != nullptr, "destination not in CodeBlob?");
2079 nmethod* nm = cb->as_nmethod_or_null();
2080 if (nm != nullptr) {
2081 // Verify that inline caches pointing to bad nmethods are clean
2082 if (!nm->is_in_use() || nm->is_unloading()) {
2083 assert(ic->is_clean(), "IC should be clean");
2084 }
2085 }
2086 break;
2087 }
2088 case relocInfo::static_call_type:
2089 case relocInfo::opt_virtual_call_type: {
2090 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2091 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2092 assert(cb != nullptr, "destination not in CodeBlob?");
2093 nmethod* nm = cb->as_nmethod_or_null();
2094 if (nm != nullptr) {
2095 // Verify that inline caches pointing to bad nmethods are clean
2096 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2097 assert(cdc->is_clean(), "IC should be clean");
2098 }
2099 }
2100 break;
2101 }
2102 default:
2103 break;
2104 }
2105 }
2106 }
2107
2108 void nmethod::mark_as_maybe_on_stack() {
2109 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
2110 }
2111
2112 bool nmethod::is_maybe_on_stack() {
2113 // If the condition below is true, it means that the nmethod was found to
2114 // be alive the previous completed marking cycle.
2115 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2116 }
2117
2118 void nmethod::inc_decompile_count() {
2119 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2120 // Could be gated by ProfileTraps, but do not bother...
2121 Method* m = method();
2122 if (m == nullptr) return;
2123 MethodData* mdo = m->method_data();
2124 if (mdo == nullptr) return;
2125 // There is a benign race here. See comments in methodData.hpp.
2126 mdo->inc_decompile_count();
2127 }
2128
2129 void nmethod::inc_method_profiling_count() {
2130 Atomic::inc(&_method_profiling_count);
2131 }
2132
2133 uint64_t nmethod::method_profiling_count() {
2134 return _method_profiling_count;
2135 }
2136
2137 bool nmethod::try_transition(signed char new_state_int) {
2138 signed char new_state = new_state_int;
2139 assert_lock_strong(NMethodState_lock);
2140 signed char old_state = _state;
2141 if (old_state >= new_state) {
2142 // Ensure monotonicity of transitions.
2143 return false;
2144 }
2145 Atomic::store(&_state, new_state);
2146 return true;
2147 }
2148
2149 void nmethod::invalidate_osr_method() {
2150 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2151 // Remove from list of active nmethods
2152 if (method() != nullptr) {
2153 method()->method_holder()->remove_osr_nmethod(this);
2154 }
2155 }
2156
2157 void nmethod::log_state_change(const char* reason) const {
2158 assert(reason != nullptr, "Must provide a reason");
2159
2160 if (LogCompilation) {
2161 if (xtty != nullptr) {
2162 ttyLocker ttyl; // keep the following output all in one block
2163 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2164 os::current_thread_id(), reason);
2165 log_identity(xtty);
2166 xtty->stamp();
2167 xtty->end_elem();
2168 }
2169 }
2170
2171 ResourceMark rm;
2172 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2173 ss.print("made not entrant: %s", reason);
2174
2175 CompileTask::print_ul(this, ss.freeze());
2176 if (PrintCompilation) {
2177 print_on_with_msg(tty, ss.freeze());
2178 }
2179 }
2180
2181 void nmethod::unlink_from_method() {
2182 if (method() != nullptr) {
2183 method()->unlink_code(this);
2184 }
2185 }
2186
2187 // Invalidate code
2188 bool nmethod::make_not_entrant(const char* reason, bool make_not_entrant) {
2189 assert(reason != nullptr, "Must provide a reason");
2190
2191 // This can be called while the system is already at a safepoint which is ok
2192 NoSafepointVerifier nsv;
2193
2194 if (is_unloading()) {
2195 // If the nmethod is unloading, then it is already not entrant through
2196 // the nmethod entry barriers. No need to do anything; GC will unload it.
2197 return false;
2198 }
2199
2200 if (Atomic::load(&_state) == not_entrant) {
2201 // Avoid taking the lock if already in required state.
2202 // This is safe from races because the state is an end-state,
2203 // which the nmethod cannot back out of once entered.
2204 // No need for fencing either.
2205 return false;
2206 }
2207
2208 {
2209 // Enter critical section. Does not block for safepoint.
2210 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2211
2212 if (Atomic::load(&_state) == not_entrant) {
2213 // another thread already performed this transition so nothing
2214 // to do, but return false to indicate this.
2215 return false;
2216 }
2217
2218 if (is_osr_method()) {
2219 // This logic is equivalent to the logic below for patching the
2220 // verified entry point of regular methods.
2221 // this effectively makes the osr nmethod not entrant
2222 invalidate_osr_method();
2223 } else {
2224 // The caller can be calling the method statically or through an inline
2225 // cache call.
2226 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
2227 SharedRuntime::get_handle_wrong_method_stub());
2228
2229 // Update the relocation info for the patched entry.
2230 // First, get the old relocation info...
2231 RelocIterator iter(this, verified_entry_point(), verified_entry_point() + 8);
2232 if (iter.next() && iter.addr() == verified_entry_point()) {
2233 Relocation* old_reloc = iter.reloc();
2234 // ...then reset the iterator to update it.
2235 RelocIterator iter(this, verified_entry_point(), verified_entry_point() + 8);
2236 relocInfo::change_reloc_info_for_address(&iter, verified_entry_point(), old_reloc->type(),
2237 relocInfo::relocType::runtime_call_type);
2238 }
2239 }
2240
2241 if (update_recompile_counts()) {
2242 // Mark the method as decompiled.
2243 inc_decompile_count();
2244 }
2245
2246 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2247 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2248 // If nmethod entry barriers are not supported, we won't mark
2249 // nmethods as on-stack when they become on-stack. So we
2250 // degrade to a less accurate flushing strategy, for now.
2251 mark_as_maybe_on_stack();
2252 }
2253
2254 // Change state
2255 bool success = try_transition(not_entrant);
2256 assert(success, "Transition can't fail");
2257
2258 // Log the transition once
2259 log_state_change(reason);
2260
2261 // Remove nmethod from method.
2262 unlink_from_method();
2263
2264 if (make_not_entrant) {
2265 // Keep cached code if it was simply replaced
2266 // otherwise make it not entrant too.
2267 AOTCodeCache::invalidate(_aot_code_entry);
2268 }
2269
2270 CompileBroker::log_not_entrant(this);
2271 } // leave critical region under NMethodState_lock
2272
2273 #if INCLUDE_JVMCI
2274 // Invalidate can't occur while holding the NMethodState_lock
2275 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2276 if (nmethod_data != nullptr) {
2277 nmethod_data->invalidate_nmethod_mirror(this);
2278 }
2279 #endif
2280
2281 #ifdef ASSERT
2282 if (is_osr_method() && method() != nullptr) {
2283 // Make sure osr nmethod is invalidated, i.e. not on the list
2284 bool found = method()->method_holder()->remove_osr_nmethod(this);
2285 assert(!found, "osr nmethod should have been invalidated");
2286 }
2287 #endif
2288
2289 return true;
2290 }
2291
2292 // For concurrent GCs, there must be a handshake between unlink and flush
2293 void nmethod::unlink() {
2294 if (is_unlinked()) {
2295 // Already unlinked.
2296 return;
2297 }
2298
2299 flush_dependencies();
2300
2301 // unlink_from_method will take the NMethodState_lock.
2302 // In this case we don't strictly need it when unlinking nmethods from
2303 // the Method, because it is only concurrently unlinked by
2304 // the entry barrier, which acquires the per nmethod lock.
2305 unlink_from_method();
2306
2307 if (is_osr_method()) {
2308 invalidate_osr_method();
2309 }
2310
2311 #if INCLUDE_JVMCI
2312 // Clear the link between this nmethod and a HotSpotNmethod mirror
2313 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2314 if (nmethod_data != nullptr) {
2315 nmethod_data->invalidate_nmethod_mirror(this);
2316 }
2317 #endif
2318
2319 // Post before flushing as jmethodID is being used
2320 post_compiled_method_unload();
2321
2322 // Register for flushing when it is safe. For concurrent class unloading,
2323 // that would be after the unloading handshake, and for STW class unloading
2324 // that would be when getting back to the VM thread.
2325 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2326 }
2327
2328 void nmethod::purge(bool unregister_nmethod) {
2329
2330 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2331
2332 // completely deallocate this method
2333 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2334 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
2335 "/Free CodeCache:%zuKb",
2336 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
2337 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
2338
2339 // We need to deallocate any ExceptionCache data.
2340 // Note that we do not need to grab the nmethod lock for this, it
2341 // better be thread safe if we're disposing of it!
2342 ExceptionCache* ec = exception_cache();
2343 while(ec != nullptr) {
2344 ExceptionCache* next = ec->next();
2345 delete ec;
2346 ec = next;
2347 }
2348 if (_pc_desc_container != nullptr) {
2349 delete _pc_desc_container;
2350 }
2351 if (_compiled_ic_data != nullptr) {
2352 delete[] _compiled_ic_data;
2353 }
2354
2355 if (_immutable_data != data_end() && !AOTCodeCache::is_address_in_aot_cache((address)_oop_maps)) {
2356 os::free(_immutable_data);
2357 _immutable_data = blob_end(); // Valid not null address
2358 }
2359 if (unregister_nmethod) {
2360 Universe::heap()->unregister_nmethod(this);
2361 }
2362 CodeCache::unregister_old_nmethod(this);
2363
2364 CodeBlob::purge();
2365 }
2366
2367 oop nmethod::oop_at(int index) const {
2368 if (index == 0) {
2369 return nullptr;
2370 }
2371
2372 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2373 return bs_nm->oop_load_no_keepalive(this, index);
2374 }
2375
2376 oop nmethod::oop_at_phantom(int index) const {
2377 if (index == 0) {
2378 return nullptr;
2379 }
2380
2381 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2382 return bs_nm->oop_load_phantom(this, index);
2383 }
2384
2385 //
2386 // Notify all classes this nmethod is dependent on that it is no
2387 // longer dependent.
2388
2389 void nmethod::flush_dependencies() {
2390 if (!has_flushed_dependencies()) {
2391 set_has_flushed_dependencies(true);
2392 for (Dependencies::DepStream deps(this); deps.next(); ) {
2393 if (deps.type() == Dependencies::call_site_target_value) {
2394 // CallSite dependencies are managed on per-CallSite instance basis.
2395 oop call_site = deps.argument_oop(0);
2396 MethodHandles::clean_dependency_context(call_site);
2397 } else {
2398 InstanceKlass* ik = deps.context_type();
2399 if (ik == nullptr) {
2400 continue; // ignore things like evol_method
2401 }
2402 // During GC liveness of dependee determines class that needs to be updated.
2403 // The GC may clean dependency contexts concurrently and in parallel.
2404 ik->clean_dependency_context();
2405 }
2406 }
2407 }
2408 }
2409
2410 void nmethod::post_compiled_method(CompileTask* task) {
2411 task->mark_success();
2412 task->set_nm_content_size(content_size());
2413 task->set_nm_insts_size(insts_size());
2414 task->set_nm_total_size(total_size());
2415
2416 // task->is_aot() is true only for loaded cached code.
2417 // nmethod::_aot_code_entry is set for loaded and stored cached code
2418 // to invalidate the entry when nmethod is deoptimized.
2419 // There is option to not store in archive cached code.
2420 guarantee((_aot_code_entry != nullptr) || !task->is_aot() || VerifyCachedCode, "sanity");
2421
2422 // JVMTI -- compiled method notification (must be done outside lock)
2423 post_compiled_method_load_event();
2424
2425 if (CompilationLog::log() != nullptr) {
2426 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2427 }
2428
2429 const DirectiveSet* directive = task->directive();
2430 maybe_print_nmethod(directive);
2431 }
2432
2433 // ------------------------------------------------------------------
2434 // post_compiled_method_load_event
2435 // new method for install_code() path
2436 // Transfer information from compilation to jvmti
2437 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2438 // This is a bad time for a safepoint. We don't want
2439 // this nmethod to get unloaded while we're queueing the event.
2440 NoSafepointVerifier nsv;
2441
2442 Method* m = method();
2443 HOTSPOT_COMPILED_METHOD_LOAD(
2444 (char *) m->klass_name()->bytes(),
2445 m->klass_name()->utf8_length(),
2446 (char *) m->name()->bytes(),
2447 m->name()->utf8_length(),
2448 (char *) m->signature()->bytes(),
2449 m->signature()->utf8_length(),
2450 insts_begin(), insts_size());
2451
2452
2453 if (JvmtiExport::should_post_compiled_method_load()) {
2454 // Only post unload events if load events are found.
2455 set_load_reported();
2456 // If a JavaThread hasn't been passed in, let the Service thread
2457 // (which is a real Java thread) post the event
2458 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2459 if (state == nullptr) {
2460 // Execute any barrier code for this nmethod as if it's called, since
2461 // keeping it alive looks like stack walking.
2462 run_nmethod_entry_barrier();
2463 ServiceThread::enqueue_deferred_event(&event);
2464 } else {
2465 // This enters the nmethod barrier outside in the caller.
2466 state->enqueue_event(&event);
2467 }
2468 }
2469 }
2470
2471 void nmethod::post_compiled_method_unload() {
2472 assert(_method != nullptr, "just checking");
2473 DTRACE_METHOD_UNLOAD_PROBE(method());
2474
2475 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2476 // post the event. The Method* will not be valid when this is freed.
2477
2478 // Don't bother posting the unload if the load event wasn't posted.
2479 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2480 JvmtiDeferredEvent event =
2481 JvmtiDeferredEvent::compiled_method_unload_event(
2482 method()->jmethod_id(), insts_begin());
2483 ServiceThread::enqueue_deferred_event(&event);
2484 }
2485 }
2486
2487 // Iterate over metadata calling this function. Used by RedefineClasses
2488 void nmethod::metadata_do(MetadataClosure* f) {
2489 {
2490 // Visit all immediate references that are embedded in the instruction stream.
2491 RelocIterator iter(this, oops_reloc_begin());
2492 while (iter.next()) {
2493 if (iter.type() == relocInfo::metadata_type) {
2494 metadata_Relocation* r = iter.metadata_reloc();
2495 // In this metadata, we must only follow those metadatas directly embedded in
2496 // the code. Other metadatas (oop_index>0) are seen as part of
2497 // the metadata section below.
2498 assert(1 == (r->metadata_is_immediate()) +
2499 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2500 "metadata must be found in exactly one place");
2501 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2502 Metadata* md = r->metadata_value();
2503 if (md != _method) f->do_metadata(md);
2504 }
2505 } else if (iter.type() == relocInfo::virtual_call_type) {
2506 // Check compiledIC holders associated with this nmethod
2507 ResourceMark rm;
2508 CompiledIC *ic = CompiledIC_at(&iter);
2509 ic->metadata_do(f);
2510 }
2511 }
2512 }
2513
2514 // Visit the metadata section
2515 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2516 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2517 Metadata* md = *p;
2518 f->do_metadata(md);
2519 }
2520
2521 // Visit metadata not embedded in the other places.
2522 if (_method != nullptr) f->do_metadata(_method);
2523 }
2524
2525 // Heuristic for nuking nmethods even though their oops are live.
2526 // Main purpose is to reduce code cache pressure and get rid of
2527 // nmethods that don't seem to be all that relevant any longer.
2528 bool nmethod::is_cold() {
2529 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2530 // No heuristic unloading at all
2531 return false;
2532 }
2533
2534 if (!is_maybe_on_stack() && is_not_entrant()) {
2535 // Not entrant nmethods that are not on any stack can just
2536 // be removed
2537 return true;
2538 }
2539
2540 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2541 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2542 // On platforms that don't support nmethod entry barriers, we can't
2543 // trust the temporal aspect of the gc epochs. So we can't detect
2544 // cold nmethods on such platforms.
2545 return false;
2546 }
2547
2548 if (!UseCodeCacheFlushing) {
2549 // Bail out if we don't heuristically remove nmethods
2550 return false;
2551 }
2552
2553 // Other code can be phased out more gradually after N GCs
2554 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2555 }
2556
2557 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2558 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2559 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2560 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2561 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2562
2563 class IsUnloadingState: public AllStatic {
2564 static const uint8_t _is_unloading_mask = 1;
2565 static const uint8_t _is_unloading_shift = 0;
2566 static const uint8_t _unloading_cycle_mask = 6;
2567 static const uint8_t _unloading_cycle_shift = 1;
2568
2569 static uint8_t set_is_unloading(uint8_t state, bool value) {
2570 state &= (uint8_t)~_is_unloading_mask;
2571 if (value) {
2572 state |= 1 << _is_unloading_shift;
2573 }
2574 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2575 return state;
2576 }
2577
2578 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2579 state &= (uint8_t)~_unloading_cycle_mask;
2580 state |= (uint8_t)(value << _unloading_cycle_shift);
2581 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2582 return state;
2583 }
2584
2585 public:
2586 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2587 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2588
2589 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2590 uint8_t state = 0;
2591 state = set_is_unloading(state, is_unloading);
2592 state = set_unloading_cycle(state, unloading_cycle);
2593 return state;
2594 }
2595 };
2596
2597 bool nmethod::is_unloading() {
2598 uint8_t state = Atomic::load(&_is_unloading_state);
2599 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2600 if (state_is_unloading) {
2601 return true;
2602 }
2603 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2604 uint8_t current_cycle = CodeCache::unloading_cycle();
2605 if (state_unloading_cycle == current_cycle) {
2606 return false;
2607 }
2608
2609 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2610 // should be unloaded. This can be either because there is a dead oop,
2611 // or because is_cold() heuristically determines it is time to unload.
2612 state_unloading_cycle = current_cycle;
2613 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2614 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2615
2616 // Note that if an nmethod has dead oops, everyone will agree that the
2617 // nmethod is_unloading. However, the is_cold heuristics can yield
2618 // different outcomes, so we guard the computed result with a CAS
2619 // to ensure all threads have a shared view of whether an nmethod
2620 // is_unloading or not.
2621 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2622
2623 if (found_state == state) {
2624 // First to change state, we win
2625 return state_is_unloading;
2626 } else {
2627 // State already set, so use it
2628 return IsUnloadingState::is_unloading(found_state);
2629 }
2630 }
2631
2632 void nmethod::clear_unloading_state() {
2633 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2634 Atomic::store(&_is_unloading_state, state);
2635 }
2636
2637
2638 // This is called at the end of the strong tracing/marking phase of a
2639 // GC to unload an nmethod if it contains otherwise unreachable
2640 // oops or is heuristically found to be not important.
2641 void nmethod::do_unloading(bool unloading_occurred) {
2642 // Make sure the oop's ready to receive visitors
2643 if (is_unloading()) {
2644 unlink();
2645 } else {
2646 unload_nmethod_caches(unloading_occurred);
2647 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2648 if (bs_nm != nullptr) {
2649 bs_nm->disarm(this);
2650 }
2651 }
2652 }
2653
2654 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
2655 // Prevent extra code cache walk for platforms that don't have immediate oops.
2656 if (relocInfo::mustIterateImmediateOopsInCode()) {
2657 RelocIterator iter(this, oops_reloc_begin());
2658
2659 while (iter.next()) {
2660 if (iter.type() == relocInfo::oop_type ) {
2661 oop_Relocation* r = iter.oop_reloc();
2662 // In this loop, we must only follow those oops directly embedded in
2663 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2664 assert(1 == (r->oop_is_immediate()) +
2665 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2666 "oop must be found in exactly one place");
2667 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2668 f->do_oop(r->oop_addr());
2669 }
2670 }
2671 }
2672 }
2673
2674 // Scopes
2675 // This includes oop constants not inlined in the code stream.
2676 for (oop* p = oops_begin(); p < oops_end(); p++) {
2677 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2678 f->do_oop(p);
2679 }
2680 }
2681
2682 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2683 // Process oops in the nmethod
2684 oops_do(cl);
2685
2686 // CodeCache unloading support
2687 mark_as_maybe_on_stack();
2688
2689 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2690 bs_nm->disarm(this);
2691
2692 // There's an assumption made that this function is not used by GCs that
2693 // relocate objects, and therefore we don't call fix_oop_relocations.
2694 }
2695
2696 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2697
2698 void nmethod::oops_do_log_change(const char* state) {
2699 LogTarget(Trace, gc, nmethod) lt;
2700 if (lt.is_enabled()) {
2701 LogStream ls(lt);
2702 CompileTask::print(&ls, this, state, true /* short_form */);
2703 }
2704 }
2705
2706 bool nmethod::oops_do_try_claim() {
2707 if (oops_do_try_claim_weak_request()) {
2708 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2709 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2710 return true;
2711 }
2712 return false;
2713 }
2714
2715 bool nmethod::oops_do_try_claim_weak_request() {
2716 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2717
2718 if ((_oops_do_mark_link == nullptr) &&
2719 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2720 oops_do_log_change("oops_do, mark weak request");
2721 return true;
2722 }
2723 return false;
2724 }
2725
2726 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2727 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2728 }
2729
2730 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2731 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2732
2733 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));
2734 if (old_next == nullptr) {
2735 oops_do_log_change("oops_do, mark strong done");
2736 }
2737 return old_next;
2738 }
2739
2740 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2741 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2742 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2743
2744 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2745 if (old_next == next) {
2746 oops_do_log_change("oops_do, mark strong request");
2747 }
2748 return old_next;
2749 }
2750
2751 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2752 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2753 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2754
2755 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2756 if (old_next == next) {
2757 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2758 return true;
2759 }
2760 return false;
2761 }
2762
2763 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2764 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2765
2766 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2767 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2768 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2769
2770 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2771 // Self-loop if needed.
2772 if (old_head == nullptr) {
2773 old_head = this;
2774 }
2775 // Try to install end of list and weak done tag.
2776 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)) {
2777 oops_do_log_change("oops_do, mark weak done");
2778 return nullptr;
2779 } else {
2780 return old_head;
2781 }
2782 }
2783
2784 void nmethod::oops_do_add_to_list_as_strong_done() {
2785 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2786
2787 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2788 // Self-loop if needed.
2789 if (old_head == nullptr) {
2790 old_head = this;
2791 }
2792 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2793 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2794
2795 oops_do_set_strong_done(old_head);
2796 }
2797
2798 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2799 if (!oops_do_try_claim_weak_request()) {
2800 // Failed to claim for weak processing.
2801 oops_do_log_change("oops_do, mark weak request fail");
2802 return;
2803 }
2804
2805 p->do_regular_processing(this);
2806
2807 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2808 if (old_head == nullptr) {
2809 return;
2810 }
2811 oops_do_log_change("oops_do, mark weak done fail");
2812 // Adding to global list failed, another thread added a strong request.
2813 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2814 "must be but is %u", extract_state(_oops_do_mark_link));
2815
2816 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2817
2818 oops_do_set_strong_done(old_head);
2819 // Do missing strong processing.
2820 p->do_remaining_strong_processing(this);
2821 }
2822
2823 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2824 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2825 if (next_raw == nullptr) {
2826 p->do_regular_processing(this);
2827 oops_do_add_to_list_as_strong_done();
2828 return;
2829 }
2830 // Claim failed. Figure out why and handle it.
2831 if (oops_do_has_weak_request(next_raw)) {
2832 oops_do_mark_link* old = next_raw;
2833 // Claim failed because being weak processed (state == "weak request").
2834 // Try to request deferred strong processing.
2835 next_raw = oops_do_try_add_strong_request(old);
2836 if (next_raw == old) {
2837 // Successfully requested deferred strong processing.
2838 return;
2839 }
2840 // Failed because of a concurrent transition. No longer in "weak request" state.
2841 }
2842 if (oops_do_has_any_strong_state(next_raw)) {
2843 // Already claimed for strong processing or requested for such.
2844 return;
2845 }
2846 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2847 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2848 p->do_remaining_strong_processing(this);
2849 return;
2850 }
2851 // Claim failed, some other thread got it.
2852 }
2853
2854 void nmethod::oops_do_marking_prologue() {
2855 assert_at_safepoint();
2856
2857 log_trace(gc, nmethod)("oops_do_marking_prologue");
2858 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2859 }
2860
2861 void nmethod::oops_do_marking_epilogue() {
2862 assert_at_safepoint();
2863
2864 nmethod* next = _oops_do_mark_nmethods;
2865 _oops_do_mark_nmethods = nullptr;
2866 if (next != nullptr) {
2867 nmethod* cur;
2868 do {
2869 cur = next;
2870 next = extract_nmethod(cur->_oops_do_mark_link);
2871 cur->_oops_do_mark_link = nullptr;
2872 DEBUG_ONLY(cur->verify_oop_relocations());
2873
2874 LogTarget(Trace, gc, nmethod) lt;
2875 if (lt.is_enabled()) {
2876 LogStream ls(lt);
2877 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2878 }
2879 // End if self-loop has been detected.
2880 } while (cur != next);
2881 }
2882 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2883 }
2884
2885 inline bool includes(void* p, void* from, void* to) {
2886 return from <= p && p < to;
2887 }
2888
2889
2890 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2891 assert(count >= 2, "must be sentinel values, at least");
2892
2893 #ifdef ASSERT
2894 // must be sorted and unique; we do a binary search in find_pc_desc()
2895 int prev_offset = pcs[0].pc_offset();
2896 assert(prev_offset == PcDesc::lower_offset_limit,
2897 "must start with a sentinel");
2898 for (int i = 1; i < count; i++) {
2899 int this_offset = pcs[i].pc_offset();
2900 assert(this_offset > prev_offset, "offsets must be sorted");
2901 prev_offset = this_offset;
2902 }
2903 assert(prev_offset == PcDesc::upper_offset_limit,
2904 "must end with a sentinel");
2905 #endif //ASSERT
2906
2907 // Search for MethodHandle invokes and tag the nmethod.
2908 for (int i = 0; i < count; i++) {
2909 if (pcs[i].is_method_handle_invoke()) {
2910 set_has_method_handle_invokes(true);
2911 break;
2912 }
2913 }
2914 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler");
2915
2916 int size = count * sizeof(PcDesc);
2917 assert(scopes_pcs_size() >= size, "oob");
2918 memcpy(scopes_pcs_begin(), pcs, size);
2919
2920 // Adjust the final sentinel downward.
2921 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2922 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2923 last_pc->set_pc_offset(content_size() + 1);
2924 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2925 // Fill any rounding gaps with copies of the last record.
2926 last_pc[1] = last_pc[0];
2927 }
2928 // The following assert could fail if sizeof(PcDesc) is not
2929 // an integral multiple of oopSize (the rounding term).
2930 // If it fails, change the logic to always allocate a multiple
2931 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2932 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2933 }
2934
2935 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2936 assert(scopes_data_size() >= size, "oob");
2937 memcpy(scopes_data_begin(), buffer, size);
2938 }
2939
2940 #ifdef ASSERT
2941 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2942 PcDesc* res = nullptr;
2943 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2944 "must start with a sentinel");
2945 // lower + 1 to exclude initial sentinel
2946 for (PcDesc* p = lower + 1; p < upper; p++) {
2947 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2948 if (match_desc(p, pc_offset, approximate)) {
2949 if (res == nullptr) {
2950 res = p;
2951 } else {
2952 res = (PcDesc*) badAddress;
2953 }
2954 }
2955 }
2956 return res;
2957 }
2958 #endif
2959
2960
2961 #ifndef PRODUCT
2962 // Version of method to collect statistic
2963 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2964 PcDesc* lower, PcDesc* upper) {
2965 ++pc_nmethod_stats.pc_desc_queries;
2966 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2967
2968 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2969 assert(desc != nullptr, "PcDesc cache should be initialized already");
2970 if (desc->pc_offset() == (pc - code_begin)) {
2971 // Cached value matched
2972 ++pc_nmethod_stats.pc_desc_tests;
2973 ++pc_nmethod_stats.pc_desc_repeats;
2974 return desc;
2975 }
2976 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2977 }
2978 #endif
2979
2980 // Finds a PcDesc with real-pc equal to "pc"
2981 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2982 PcDesc* lower_incl, PcDesc* upper_incl) {
2983 if ((pc < code_begin) ||
2984 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2985 return nullptr; // PC is wildly out of range
2986 }
2987 int pc_offset = (int) (pc - code_begin);
2988
2989 // Check the PcDesc cache if it contains the desired PcDesc
2990 // (This as an almost 100% hit rate.)
2991 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2992 if (res != nullptr) {
2993 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2994 return res;
2995 }
2996
2997 // Fallback algorithm: quasi-linear search for the PcDesc
2998 // Find the last pc_offset less than the given offset.
2999 // The successor must be the required match, if there is a match at all.
3000 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
3001 PcDesc* lower = lower_incl; // this is initial sentinel
3002 PcDesc* upper = upper_incl - 1; // exclude final sentinel
3003 if (lower >= upper) return nullptr; // no PcDescs at all
3004
3005 #define assert_LU_OK \
3006 /* invariant on lower..upper during the following search: */ \
3007 assert(lower->pc_offset() < pc_offset, "sanity"); \
3008 assert(upper->pc_offset() >= pc_offset, "sanity")
3009 assert_LU_OK;
3010
3011 // Use the last successful return as a split point.
3012 PcDesc* mid = _pc_desc_cache.last_pc_desc();
3013 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3014 if (mid->pc_offset() < pc_offset) {
3015 lower = mid;
3016 } else {
3017 upper = mid;
3018 }
3019
3020 // Take giant steps at first (4096, then 256, then 16, then 1)
3021 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3022 const int RADIX = (1 << LOG2_RADIX);
3023 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3024 while ((mid = lower + step) < upper) {
3025 assert_LU_OK;
3026 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3027 if (mid->pc_offset() < pc_offset) {
3028 lower = mid;
3029 } else {
3030 upper = mid;
3031 break;
3032 }
3033 }
3034 assert_LU_OK;
3035 }
3036
3037 // Sneak up on the value with a linear search of length ~16.
3038 while (true) {
3039 assert_LU_OK;
3040 mid = lower + 1;
3041 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3042 if (mid->pc_offset() < pc_offset) {
3043 lower = mid;
3044 } else {
3045 upper = mid;
3046 break;
3047 }
3048 }
3049 #undef assert_LU_OK
3050
3051 if (match_desc(upper, pc_offset, approximate)) {
3052 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3053 if (!Thread::current_in_asgct()) {
3054 // we don't want to modify the cache if we're in ASGCT
3055 // which is typically called in a signal handler
3056 _pc_desc_cache.add_pc_desc(upper);
3057 }
3058 return upper;
3059 } else {
3060 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3061 return nullptr;
3062 }
3063 }
3064
3065 bool nmethod::check_dependency_on(DepChange& changes) {
3066 // What has happened:
3067 // 1) a new class dependee has been added
3068 // 2) dependee and all its super classes have been marked
3069 bool found_check = false; // set true if we are upset
3070 for (Dependencies::DepStream deps(this); deps.next(); ) {
3071 // Evaluate only relevant dependencies.
3072 if (deps.spot_check_dependency_at(changes) != nullptr) {
3073 found_check = true;
3074 NOT_DEBUG(break);
3075 }
3076 }
3077 return found_check;
3078 }
3079
3080 // Called from mark_for_deoptimization, when dependee is invalidated.
3081 bool nmethod::is_dependent_on_method(Method* dependee) {
3082 for (Dependencies::DepStream deps(this); deps.next(); ) {
3083 if (deps.type() != Dependencies::evol_method)
3084 continue;
3085 Method* method = deps.method_argument(0);
3086 if (method == dependee) return true;
3087 }
3088 return false;
3089 }
3090
3091 void nmethod_init() {
3092 // make sure you didn't forget to adjust the filler fields
3093 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3094 }
3095
3096 // -----------------------------------------------------------------------------
3097 // Verification
3098
3099 class VerifyOopsClosure: public OopClosure {
3100 nmethod* _nm;
3101 bool _ok;
3102 public:
3103 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3104 bool ok() { return _ok; }
3105 virtual void do_oop(oop* p) {
3106 if (oopDesc::is_oop_or_null(*p)) return;
3107 // Print diagnostic information before calling print_nmethod().
3108 // Assertions therein might prevent call from returning.
3109 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3110 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3111 if (_ok) {
3112 _nm->print_nmethod(true);
3113 _ok = false;
3114 }
3115 }
3116 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3117 };
3118
3119 class VerifyMetadataClosure: public MetadataClosure {
3120 public:
3121 void do_metadata(Metadata* md) {
3122 if (md->is_method()) {
3123 Method* method = (Method*)md;
3124 assert(!method->is_old(), "Should not be installing old methods");
3125 }
3126 }
3127 };
3128
3129
3130 void nmethod::verify() {
3131 if (is_not_entrant())
3132 return;
3133
3134 // Make sure all the entry points are correctly aligned for patching.
3135 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
3136
3137 // assert(oopDesc::is_oop(method()), "must be valid");
3138
3139 ResourceMark rm;
3140
3141 if (!CodeCache::contains(this)) {
3142 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3143 }
3144
3145 if(is_native_method() )
3146 return;
3147
3148 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3149 if (nm != this) {
3150 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3151 }
3152
3153 // Verification can triggered during shutdown after AOTCodeCache is closed.
3154 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3155 if (!is_aot() || AOTCodeCache::is_on()) {
3156 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3157 if (! p->verify(this)) {
3158 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3159 }
3160 }
3161
3162 #ifdef ASSERT
3163 #if INCLUDE_JVMCI
3164 {
3165 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3166 ImmutableOopMapSet* oms = oop_maps();
3167 ImplicitExceptionTable implicit_table(this);
3168 for (uint i = 0; i < implicit_table.len(); i++) {
3169 int exec_offset = (int) implicit_table.get_exec_offset(i);
3170 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3171 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3172 bool found = false;
3173 for (int i = 0, imax = oms->count(); i < imax; i++) {
3174 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3175 found = true;
3176 break;
3177 }
3178 }
3179 assert(found, "missing oopmap");
3180 }
3181 }
3182 }
3183 #endif
3184 #endif
3185 }
3186
3187 VerifyOopsClosure voc(this);
3188 oops_do(&voc);
3189 assert(voc.ok(), "embedded oops must be OK");
3190 Universe::heap()->verify_nmethod(this);
3191
3192 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3193 nm->method()->external_name(), p2i(_oops_do_mark_link));
3194 if (!is_aot() || AOTCodeCache::is_on()) {
3195 verify_scopes();
3196 }
3197
3198 CompiledICLocker nm_verify(this);
3199 VerifyMetadataClosure vmc;
3200 metadata_do(&vmc);
3201 }
3202
3203
3204 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3205
3206 // Verify IC only when nmethod installation is finished.
3207 if (!is_not_installed()) {
3208 if (CompiledICLocker::is_safe(this)) {
3209 if (is_inline_cache) {
3210 CompiledIC_at(this, call_site);
3211 } else {
3212 CompiledDirectCall::at(call_site);
3213 }
3214 } else {
3215 CompiledICLocker ml_verify(this);
3216 if (is_inline_cache) {
3217 CompiledIC_at(this, call_site);
3218 } else {
3219 CompiledDirectCall::at(call_site);
3220 }
3221 }
3222 }
3223
3224 HandleMark hm(Thread::current());
3225
3226 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3227 assert(pd != nullptr, "PcDesc must exist");
3228 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3229 !sd->is_top(); sd = sd->sender()) {
3230 sd->verify();
3231 }
3232 }
3233
3234 void nmethod::verify_scopes() {
3235 if( !method() ) return; // Runtime stubs have no scope
3236 if (method()->is_native()) return; // Ignore stub methods.
3237 // iterate through all interrupt point
3238 // and verify the debug information is valid.
3239 RelocIterator iter(this);
3240 while (iter.next()) {
3241 address stub = nullptr;
3242 switch (iter.type()) {
3243 case relocInfo::virtual_call_type:
3244 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3245 break;
3246 case relocInfo::opt_virtual_call_type:
3247 stub = iter.opt_virtual_call_reloc()->static_stub();
3248 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3249 break;
3250 case relocInfo::static_call_type:
3251 stub = iter.static_call_reloc()->static_stub();
3252 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3253 break;
3254 case relocInfo::runtime_call_type:
3255 case relocInfo::runtime_call_w_cp_type: {
3256 address destination = iter.reloc()->value();
3257 // Right now there is no way to find out which entries support
3258 // an interrupt point. It would be nice if we had this
3259 // information in a table.
3260 break;
3261 }
3262 default:
3263 break;
3264 }
3265 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3266 }
3267 }
3268
3269
3270 // -----------------------------------------------------------------------------
3271 // Printing operations
3272
3273 void nmethod::print_on_impl(outputStream* st) const {
3274 ResourceMark rm;
3275
3276 st->print("Compiled method ");
3277
3278 if (is_compiled_by_c1()) {
3279 st->print("(c1) ");
3280 } else if (is_compiled_by_c2()) {
3281 st->print("(c2) ");
3282 } else if (is_compiled_by_jvmci()) {
3283 st->print("(JVMCI) ");
3284 } else {
3285 st->print("(n/a) ");
3286 }
3287
3288 print_on_with_msg(st, nullptr);
3289
3290 if (WizardMode) {
3291 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3292 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3293 st->print(" { ");
3294 st->print_cr("%s ", state());
3295 st->print_cr("}:");
3296 }
3297 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3298 p2i(this),
3299 p2i(this) + size(),
3300 size());
3301 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3302 p2i(consts_begin()),
3303 p2i(consts_end()),
3304 consts_size());
3305 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3306 p2i(insts_begin()),
3307 p2i(insts_end()),
3308 insts_size());
3309 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3310 p2i(stub_begin()),
3311 p2i(stub_end()),
3312 stub_size());
3313 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3314 p2i(oops_begin()),
3315 p2i(oops_end()),
3316 oops_size());
3317 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3318 p2i(mutable_data_begin()),
3319 p2i(mutable_data_end()),
3320 mutable_data_size());
3321 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3322 p2i(relocation_begin()),
3323 p2i(relocation_end()),
3324 relocation_size());
3325 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3326 p2i(metadata_begin()),
3327 p2i(metadata_end()),
3328 metadata_size());
3329 #if INCLUDE_JVMCI
3330 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3331 p2i(jvmci_data_begin()),
3332 p2i(jvmci_data_end()),
3333 jvmci_data_size());
3334 #endif
3335 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3336 p2i(immutable_data_begin()),
3337 p2i(immutable_data_end()),
3338 immutable_data_size());
3339 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3340 p2i(dependencies_begin()),
3341 p2i(dependencies_end()),
3342 dependencies_size());
3343 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3344 p2i(nul_chk_table_begin()),
3345 p2i(nul_chk_table_end()),
3346 nul_chk_table_size());
3347 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3348 p2i(handler_table_begin()),
3349 p2i(handler_table_end()),
3350 handler_table_size());
3351 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3352 p2i(scopes_pcs_begin()),
3353 p2i(scopes_pcs_end()),
3354 scopes_pcs_size());
3355 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3356 p2i(scopes_data_begin()),
3357 p2i(scopes_data_end()),
3358 scopes_data_size());
3359 #if INCLUDE_JVMCI
3360 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3361 p2i(speculations_begin()),
3362 p2i(speculations_end()),
3363 speculations_size());
3364 #endif
3365 if (AOTCodeCache::is_on() && _aot_code_entry != nullptr) {
3366 _aot_code_entry->print(st);
3367 }
3368 }
3369
3370 void nmethod::print_code() {
3371 ResourceMark m;
3372 ttyLocker ttyl;
3373 // Call the specialized decode method of this class.
3374 decode(tty);
3375 }
3376
3377 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3378
3379 void nmethod::print_dependencies_on(outputStream* out) {
3380 ResourceMark rm;
3381 stringStream st;
3382 st.print_cr("Dependencies:");
3383 for (Dependencies::DepStream deps(this); deps.next(); ) {
3384 deps.print_dependency(&st);
3385 InstanceKlass* ctxk = deps.context_type();
3386 if (ctxk != nullptr) {
3387 if (ctxk->is_dependent_nmethod(this)) {
3388 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3389 }
3390 }
3391 deps.log_dependency(); // put it into the xml log also
3392 }
3393 out->print_raw(st.as_string());
3394 }
3395 #endif
3396
3397 #if defined(SUPPORT_DATA_STRUCTS)
3398
3399 // Print the oops from the underlying CodeBlob.
3400 void nmethod::print_oops(outputStream* st) {
3401 ResourceMark m;
3402 st->print("Oops:");
3403 if (oops_begin() < oops_end()) {
3404 st->cr();
3405 for (oop* p = oops_begin(); p < oops_end(); p++) {
3406 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3407 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3408 if (Universe::contains_non_oop_word(p)) {
3409 st->print_cr("NON_OOP");
3410 continue; // skip non-oops
3411 }
3412 if (*p == nullptr) {
3413 st->print_cr("nullptr-oop");
3414 continue; // skip non-oops
3415 }
3416 (*p)->print_value_on(st);
3417 st->cr();
3418 }
3419 } else {
3420 st->print_cr(" <list empty>");
3421 }
3422 }
3423
3424 // Print metadata pool.
3425 void nmethod::print_metadata(outputStream* st) {
3426 ResourceMark m;
3427 st->print("Metadata:");
3428 if (metadata_begin() < metadata_end()) {
3429 st->cr();
3430 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3431 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3432 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3433 if (*p && *p != Universe::non_oop_word()) {
3434 (*p)->print_value_on(st);
3435 }
3436 st->cr();
3437 }
3438 } else {
3439 st->print_cr(" <list empty>");
3440 }
3441 }
3442
3443 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3444 void nmethod::print_scopes_on(outputStream* st) {
3445 // Find the first pc desc for all scopes in the code and print it.
3446 ResourceMark rm;
3447 st->print("scopes:");
3448 if (scopes_pcs_begin() < scopes_pcs_end()) {
3449 st->cr();
3450 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3451 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3452 continue;
3453
3454 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3455 while (sd != nullptr) {
3456 sd->print_on(st, p); // print output ends with a newline
3457 sd = sd->sender();
3458 }
3459 }
3460 } else {
3461 st->print_cr(" <list empty>");
3462 }
3463 }
3464 #endif
3465
3466 #ifndef PRODUCT // RelocIterator does support printing only then.
3467 void nmethod::print_relocations_on(outputStream* st) {
3468 ResourceMark m; // in case methods get printed via the debugger
3469 st->print_cr("relocations:");
3470 RelocIterator iter(this);
3471 iter.print_on(st);
3472 }
3473 #endif
3474
3475 void nmethod::print_pcs_on(outputStream* st) {
3476 ResourceMark m; // in case methods get printed via debugger
3477 st->print("pc-bytecode offsets:");
3478 if (scopes_pcs_begin() < scopes_pcs_end()) {
3479 st->cr();
3480 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3481 p->print_on(st, this); // print output ends with a newline
3482 }
3483 } else {
3484 st->print_cr(" <list empty>");
3485 }
3486 }
3487
3488 void nmethod::print_handler_table() {
3489 ExceptionHandlerTable(this).print(code_begin());
3490 }
3491
3492 void nmethod::print_nul_chk_table() {
3493 ImplicitExceptionTable(this).print(code_begin());
3494 }
3495
3496 void nmethod::print_recorded_oop(int log_n, int i) {
3497 void* value;
3498
3499 if (i == 0) {
3500 value = nullptr;
3501 } else {
3502 // Be careful around non-oop words. Don't create an oop
3503 // with that value, or it will assert in verification code.
3504 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3505 value = Universe::non_oop_word();
3506 } else {
3507 value = oop_at(i);
3508 }
3509 }
3510
3511 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3512
3513 if (value == Universe::non_oop_word()) {
3514 tty->print("non-oop word");
3515 } else {
3516 if (value == nullptr) {
3517 tty->print("nullptr-oop");
3518 } else {
3519 oop_at(i)->print_value_on(tty);
3520 }
3521 }
3522
3523 tty->cr();
3524 }
3525
3526 void nmethod::print_recorded_oops() {
3527 const int n = oops_count();
3528 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3529 tty->print("Recorded oops:");
3530 if (n > 0) {
3531 tty->cr();
3532 for (int i = 0; i < n; i++) {
3533 print_recorded_oop(log_n, i);
3534 }
3535 } else {
3536 tty->print_cr(" <list empty>");
3537 }
3538 }
3539
3540 void nmethod::print_recorded_metadata() {
3541 const int n = metadata_count();
3542 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3543 tty->print("Recorded metadata:");
3544 if (n > 0) {
3545 tty->cr();
3546 for (int i = 0; i < n; i++) {
3547 Metadata* m = metadata_at(i);
3548 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3549 if (m == (Metadata*)Universe::non_oop_word()) {
3550 tty->print("non-metadata word");
3551 } else if (m == nullptr) {
3552 tty->print("nullptr-oop");
3553 } else {
3554 Metadata::print_value_on_maybe_null(tty, m);
3555 }
3556 tty->cr();
3557 }
3558 } else {
3559 tty->print_cr(" <list empty>");
3560 }
3561 }
3562 #endif
3563
3564 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3565
3566 void nmethod::print_constant_pool(outputStream* st) {
3567 //-----------------------------------
3568 //---< Print the constant pool >---
3569 //-----------------------------------
3570 int consts_size = this->consts_size();
3571 if ( consts_size > 0 ) {
3572 unsigned char* cstart = this->consts_begin();
3573 unsigned char* cp = cstart;
3574 unsigned char* cend = cp + consts_size;
3575 unsigned int bytes_per_line = 4;
3576 unsigned int CP_alignment = 8;
3577 unsigned int n;
3578
3579 st->cr();
3580
3581 //---< print CP header to make clear what's printed >---
3582 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3583 n = bytes_per_line;
3584 st->print_cr("[Constant Pool]");
3585 Disassembler::print_location(cp, cstart, cend, st, true, true);
3586 Disassembler::print_hexdata(cp, n, st, true);
3587 st->cr();
3588 } else {
3589 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3590 st->print_cr("[Constant Pool (unaligned)]");
3591 }
3592
3593 //---< print CP contents, bytes_per_line at a time >---
3594 while (cp < cend) {
3595 Disassembler::print_location(cp, cstart, cend, st, true, false);
3596 Disassembler::print_hexdata(cp, n, st, false);
3597 cp += n;
3598 n = bytes_per_line;
3599 st->cr();
3600 }
3601
3602 //---< Show potential alignment gap between constant pool and code >---
3603 cend = code_begin();
3604 if( cp < cend ) {
3605 n = 4;
3606 st->print_cr("[Code entry alignment]");
3607 while (cp < cend) {
3608 Disassembler::print_location(cp, cstart, cend, st, false, false);
3609 cp += n;
3610 st->cr();
3611 }
3612 }
3613 } else {
3614 st->print_cr("[Constant Pool (empty)]");
3615 }
3616 st->cr();
3617 }
3618
3619 #endif
3620
3621 // Disassemble this nmethod.
3622 // Print additional debug information, if requested. This could be code
3623 // comments, block comments, profiling counters, etc.
3624 // The undisassembled format is useful no disassembler library is available.
3625 // The resulting hex dump (with markers) can be disassembled later, or on
3626 // another system, when/where a disassembler library is available.
3627 void nmethod::decode2(outputStream* ost) const {
3628
3629 // Called from frame::back_trace_with_decode without ResourceMark.
3630 ResourceMark rm;
3631
3632 // Make sure we have a valid stream to print on.
3633 outputStream* st = ost ? ost : tty;
3634
3635 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3636 const bool use_compressed_format = true;
3637 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3638 AbstractDisassembler::show_block_comment());
3639 #else
3640 const bool use_compressed_format = Disassembler::is_abstract();
3641 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3642 AbstractDisassembler::show_block_comment());
3643 #endif
3644
3645 st->cr();
3646 this->print_on(st);
3647 st->cr();
3648
3649 #if defined(SUPPORT_ASSEMBLY)
3650 //----------------------------------
3651 //---< Print real disassembly >---
3652 //----------------------------------
3653 if (! use_compressed_format) {
3654 st->print_cr("[Disassembly]");
3655 Disassembler::decode(const_cast<nmethod*>(this), st);
3656 st->bol();
3657 st->print_cr("[/Disassembly]");
3658 return;
3659 }
3660 #endif
3661
3662 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3663
3664 // Compressed undisassembled disassembly format.
3665 // The following status values are defined/supported:
3666 // = 0 - currently at bol() position, nothing printed yet on current line.
3667 // = 1 - currently at position after print_location().
3668 // > 1 - in the midst of printing instruction stream bytes.
3669 int compressed_format_idx = 0;
3670 int code_comment_column = 0;
3671 const int instr_maxlen = Assembler::instr_maxlen();
3672 const uint tabspacing = 8;
3673 unsigned char* start = this->code_begin();
3674 unsigned char* p = this->code_begin();
3675 unsigned char* end = this->code_end();
3676 unsigned char* pss = p; // start of a code section (used for offsets)
3677
3678 if ((start == nullptr) || (end == nullptr)) {
3679 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3680 return;
3681 }
3682 #endif
3683
3684 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3685 //---< plain abstract disassembly, no comments or anything, just section headers >---
3686 if (use_compressed_format && ! compressed_with_comments) {
3687 const_cast<nmethod*>(this)->print_constant_pool(st);
3688
3689 //---< Open the output (Marker for post-mortem disassembler) >---
3690 st->print_cr("[MachCode]");
3691 const char* header = nullptr;
3692 address p0 = p;
3693 while (p < end) {
3694 address pp = p;
3695 while ((p < end) && (header == nullptr)) {
3696 header = nmethod_section_label(p);
3697 pp = p;
3698 p += Assembler::instr_len(p);
3699 }
3700 if (pp > p0) {
3701 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3702 p0 = pp;
3703 p = pp;
3704 header = nullptr;
3705 } else if (header != nullptr) {
3706 st->bol();
3707 st->print_cr("%s", header);
3708 header = nullptr;
3709 }
3710 }
3711 //---< Close the output (Marker for post-mortem disassembler) >---
3712 st->bol();
3713 st->print_cr("[/MachCode]");
3714 return;
3715 }
3716 #endif
3717
3718 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3719 //---< abstract disassembly with comments and section headers merged in >---
3720 if (compressed_with_comments) {
3721 const_cast<nmethod*>(this)->print_constant_pool(st);
3722
3723 //---< Open the output (Marker for post-mortem disassembler) >---
3724 st->print_cr("[MachCode]");
3725 while ((p < end) && (p != nullptr)) {
3726 const int instruction_size_in_bytes = Assembler::instr_len(p);
3727
3728 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3729 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3730 // Prints nmethod_section_label as well.
3731 if (AbstractDisassembler::show_block_comment()) {
3732 print_block_comment(st, p);
3733 if (st->position() == 0) {
3734 compressed_format_idx = 0;
3735 }
3736 }
3737
3738 //---< New location information after line break >---
3739 if (compressed_format_idx == 0) {
3740 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3741 compressed_format_idx = 1;
3742 }
3743
3744 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3745 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3746 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3747
3748 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3749 //---< interrupt instruction byte stream for code comment >---
3750 if (compressed_format_idx > 1) {
3751 st->cr(); // interrupt byte stream
3752 st->cr(); // add an empty line
3753 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3754 }
3755 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3756 st->bol();
3757 compressed_format_idx = 0;
3758 }
3759
3760 //---< New location information after line break >---
3761 if (compressed_format_idx == 0) {
3762 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3763 compressed_format_idx = 1;
3764 }
3765
3766 //---< Nicely align instructions for readability >---
3767 if (compressed_format_idx > 1) {
3768 Disassembler::print_delimiter(st);
3769 }
3770
3771 //---< Now, finally, print the actual instruction bytes >---
3772 unsigned char* p0 = p;
3773 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3774 compressed_format_idx += (int)(p - p0);
3775
3776 if (Disassembler::start_newline(compressed_format_idx-1)) {
3777 st->cr();
3778 compressed_format_idx = 0;
3779 }
3780 }
3781 //---< Close the output (Marker for post-mortem disassembler) >---
3782 st->bol();
3783 st->print_cr("[/MachCode]");
3784 return;
3785 }
3786 #endif
3787 }
3788
3789 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3790
3791 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3792 RelocIterator iter(this, begin, end);
3793 bool have_one = false;
3794 while (iter.next()) {
3795 have_one = true;
3796 switch (iter.type()) {
3797 case relocInfo::none: {
3798 // Skip it and check next
3799 break;
3800 }
3801 case relocInfo::oop_type: {
3802 // Get a non-resizable resource-allocated stringStream.
3803 // Our callees make use of (nested) ResourceMarks.
3804 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3805 oop_Relocation* r = iter.oop_reloc();
3806 oop obj = r->oop_value();
3807 st.print("oop(");
3808 if (obj == nullptr) st.print("nullptr");
3809 else obj->print_value_on(&st);
3810 st.print(")");
3811 return st.as_string();
3812 }
3813 case relocInfo::metadata_type: {
3814 stringStream st;
3815 metadata_Relocation* r = iter.metadata_reloc();
3816 Metadata* obj = r->metadata_value();
3817 st.print("metadata(");
3818 if (obj == nullptr) st.print("nullptr");
3819 else obj->print_value_on(&st);
3820 st.print(")");
3821 return st.as_string();
3822 }
3823 case relocInfo::runtime_call_type:
3824 case relocInfo::runtime_call_w_cp_type: {
3825 stringStream st;
3826 st.print("runtime_call");
3827 CallRelocation* r = (CallRelocation*)iter.reloc();
3828 address dest = r->destination();
3829 if (StubRoutines::contains(dest)) {
3830 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3831 if (desc == nullptr) {
3832 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3833 }
3834 if (desc != nullptr) {
3835 st.print(" Stub::%s", desc->name());
3836 return st.as_string();
3837 }
3838 }
3839 CodeBlob* cb = CodeCache::find_blob(dest);
3840 if (cb != nullptr) {
3841 st.print(" %s", cb->name());
3842 } else {
3843 ResourceMark rm;
3844 const int buflen = 1024;
3845 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3846 int offset;
3847 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3848 st.print(" %s", buf);
3849 if (offset != 0) {
3850 st.print("+%d", offset);
3851 }
3852 }
3853 }
3854 return st.as_string();
3855 }
3856 case relocInfo::virtual_call_type: {
3857 stringStream st;
3858 st.print_raw("virtual_call");
3859 virtual_call_Relocation* r = iter.virtual_call_reloc();
3860 Method* m = r->method_value();
3861 if (m != nullptr) {
3862 assert(m->is_method(), "");
3863 m->print_short_name(&st);
3864 }
3865 return st.as_string();
3866 }
3867 case relocInfo::opt_virtual_call_type: {
3868 stringStream st;
3869 st.print_raw("optimized virtual_call");
3870 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3871 Method* m = r->method_value();
3872 if (m != nullptr) {
3873 assert(m->is_method(), "");
3874 m->print_short_name(&st);
3875 }
3876 return st.as_string();
3877 }
3878 case relocInfo::static_call_type: {
3879 stringStream st;
3880 st.print_raw("static_call");
3881 static_call_Relocation* r = iter.static_call_reloc();
3882 Method* m = r->method_value();
3883 if (m != nullptr) {
3884 assert(m->is_method(), "");
3885 m->print_short_name(&st);
3886 }
3887 return st.as_string();
3888 }
3889 case relocInfo::static_stub_type: return "static_stub";
3890 case relocInfo::external_word_type: return "external_word";
3891 case relocInfo::internal_word_type: return "internal_word";
3892 case relocInfo::section_word_type: return "section_word";
3893 case relocInfo::poll_type: return "poll";
3894 case relocInfo::poll_return_type: return "poll_return";
3895 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3896 case relocInfo::entry_guard_type: return "entry_guard";
3897 case relocInfo::post_call_nop_type: return "post_call_nop";
3898 case relocInfo::barrier_type: {
3899 barrier_Relocation* const reloc = iter.barrier_reloc();
3900 stringStream st;
3901 st.print("barrier format=%d", reloc->format());
3902 return st.as_string();
3903 }
3904
3905 case relocInfo::type_mask: return "type_bit_mask";
3906
3907 default: {
3908 stringStream st;
3909 st.print("unknown relocInfo=%d", (int) iter.type());
3910 return st.as_string();
3911 }
3912 }
3913 }
3914 return have_one ? "other" : nullptr;
3915 }
3916
3917 // Return the last scope in (begin..end]
3918 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3919 PcDesc* p = pc_desc_near(begin+1);
3920 if (p != nullptr && p->real_pc(this) <= end) {
3921 return new ScopeDesc(this, p);
3922 }
3923 return nullptr;
3924 }
3925
3926 const char* nmethod::nmethod_section_label(address pos) const {
3927 const char* label = nullptr;
3928 if (pos == code_begin()) label = "[Instructions begin]";
3929 if (pos == entry_point()) label = "[Entry Point]";
3930 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3931 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3932 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3933 // Check stub_code before checking exception_handler or deopt_handler.
3934 if (pos == this->stub_begin()) label = "[Stub Code]";
3935 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3936 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3937 return label;
3938 }
3939
3940 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3941 if (print_section_labels) {
3942 const char* label = nmethod_section_label(block_begin);
3943 if (label != nullptr) {
3944 stream->bol();
3945 stream->print_cr("%s", label);
3946 }
3947 }
3948
3949 if (block_begin == entry_point()) {
3950 Method* m = method();
3951 if (m != nullptr) {
3952 stream->print(" # ");
3953 m->print_value_on(stream);
3954 stream->cr();
3955 }
3956 if (m != nullptr && !is_osr_method()) {
3957 ResourceMark rm;
3958 int sizeargs = m->size_of_parameters();
3959 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3960 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3961 {
3962 int sig_index = 0;
3963 if (!m->is_static())
3964 sig_bt[sig_index++] = T_OBJECT; // 'this'
3965 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3966 BasicType t = ss.type();
3967 sig_bt[sig_index++] = t;
3968 if (type2size[t] == 2) {
3969 sig_bt[sig_index++] = T_VOID;
3970 } else {
3971 assert(type2size[t] == 1, "size is 1 or 2");
3972 }
3973 }
3974 assert(sig_index == sizeargs, "");
3975 }
3976 const char* spname = "sp"; // make arch-specific?
3977 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3978 int stack_slot_offset = this->frame_size() * wordSize;
3979 int tab1 = 14, tab2 = 24;
3980 int sig_index = 0;
3981 int arg_index = (m->is_static() ? 0 : -1);
3982 bool did_old_sp = false;
3983 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3984 bool at_this = (arg_index == -1);
3985 bool at_old_sp = false;
3986 BasicType t = (at_this ? T_OBJECT : ss.type());
3987 assert(t == sig_bt[sig_index], "sigs in sync");
3988 if (at_this)
3989 stream->print(" # this: ");
3990 else
3991 stream->print(" # parm%d: ", arg_index);
3992 stream->move_to(tab1);
3993 VMReg fst = regs[sig_index].first();
3994 VMReg snd = regs[sig_index].second();
3995 if (fst->is_reg()) {
3996 stream->print("%s", fst->name());
3997 if (snd->is_valid()) {
3998 stream->print(":%s", snd->name());
3999 }
4000 } else if (fst->is_stack()) {
4001 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
4002 if (offset == stack_slot_offset) at_old_sp = true;
4003 stream->print("[%s+0x%x]", spname, offset);
4004 } else {
4005 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
4006 }
4007 stream->print(" ");
4008 stream->move_to(tab2);
4009 stream->print("= ");
4010 if (at_this) {
4011 m->method_holder()->print_value_on(stream);
4012 } else {
4013 bool did_name = false;
4014 if (!at_this && ss.is_reference()) {
4015 Symbol* name = ss.as_symbol();
4016 name->print_value_on(stream);
4017 did_name = true;
4018 }
4019 if (!did_name)
4020 stream->print("%s", type2name(t));
4021 }
4022 if (at_old_sp) {
4023 stream->print(" (%s of caller)", spname);
4024 did_old_sp = true;
4025 }
4026 stream->cr();
4027 sig_index += type2size[t];
4028 arg_index += 1;
4029 if (!at_this) ss.next();
4030 }
4031 if (!did_old_sp) {
4032 stream->print(" # ");
4033 stream->move_to(tab1);
4034 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4035 stream->print(" (%s of caller)", spname);
4036 stream->cr();
4037 }
4038 }
4039 }
4040 }
4041
4042 // Returns whether this nmethod has code comments.
4043 bool nmethod::has_code_comment(address begin, address end) {
4044 // scopes?
4045 ScopeDesc* sd = scope_desc_in(begin, end);
4046 if (sd != nullptr) return true;
4047
4048 // relocations?
4049 const char* str = reloc_string_for(begin, end);
4050 if (str != nullptr) return true;
4051
4052 // implicit exceptions?
4053 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4054 if (cont_offset != 0) return true;
4055
4056 return false;
4057 }
4058
4059 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4060 ImplicitExceptionTable implicit_table(this);
4061 int pc_offset = (int)(begin - code_begin());
4062 int cont_offset = implicit_table.continuation_offset(pc_offset);
4063 bool oop_map_required = false;
4064 if (cont_offset != 0) {
4065 st->move_to(column, 6, 0);
4066 if (pc_offset == cont_offset) {
4067 st->print("; implicit exception: deoptimizes");
4068 oop_map_required = true;
4069 } else {
4070 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4071 }
4072 }
4073
4074 // Find an oopmap in (begin, end]. We use the odd half-closed
4075 // interval so that oop maps and scope descs which are tied to the
4076 // byte after a call are printed with the call itself. OopMaps
4077 // associated with implicit exceptions are printed with the implicit
4078 // instruction.
4079 address base = code_begin();
4080 ImmutableOopMapSet* oms = oop_maps();
4081 if (oms != nullptr) {
4082 for (int i = 0, imax = oms->count(); i < imax; i++) {
4083 const ImmutableOopMapPair* pair = oms->pair_at(i);
4084 const ImmutableOopMap* om = pair->get_from(oms);
4085 address pc = base + pair->pc_offset();
4086 if (pc >= begin) {
4087 #if INCLUDE_JVMCI
4088 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4089 #else
4090 bool is_implicit_deopt = false;
4091 #endif
4092 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4093 st->move_to(column, 6, 0);
4094 st->print("; ");
4095 om->print_on(st);
4096 oop_map_required = false;
4097 }
4098 }
4099 if (pc > end) {
4100 break;
4101 }
4102 }
4103 }
4104 assert(!oop_map_required, "missed oopmap");
4105
4106 Thread* thread = Thread::current();
4107
4108 // Print any debug info present at this pc.
4109 ScopeDesc* sd = scope_desc_in(begin, end);
4110 if (sd != nullptr) {
4111 st->move_to(column, 6, 0);
4112 if (sd->bci() == SynchronizationEntryBCI) {
4113 st->print(";*synchronization entry");
4114 } else if (sd->bci() == AfterBci) {
4115 st->print(";* method exit (unlocked if synchronized)");
4116 } else if (sd->bci() == UnwindBci) {
4117 st->print(";* unwind (locked if synchronized)");
4118 } else if (sd->bci() == AfterExceptionBci) {
4119 st->print(";* unwind (unlocked if synchronized)");
4120 } else if (sd->bci() == UnknownBci) {
4121 st->print(";* unknown");
4122 } else if (sd->bci() == InvalidFrameStateBci) {
4123 st->print(";* invalid frame state");
4124 } else {
4125 if (sd->method() == nullptr) {
4126 st->print("method is nullptr");
4127 } else if (sd->method()->is_native()) {
4128 st->print("method is native");
4129 } else {
4130 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4131 st->print(";*%s", Bytecodes::name(bc));
4132 switch (bc) {
4133 case Bytecodes::_invokevirtual:
4134 case Bytecodes::_invokespecial:
4135 case Bytecodes::_invokestatic:
4136 case Bytecodes::_invokeinterface:
4137 {
4138 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4139 st->print(" ");
4140 if (invoke.name() != nullptr)
4141 invoke.name()->print_symbol_on(st);
4142 else
4143 st->print("<UNKNOWN>");
4144 break;
4145 }
4146 case Bytecodes::_getfield:
4147 case Bytecodes::_putfield:
4148 case Bytecodes::_getstatic:
4149 case Bytecodes::_putstatic:
4150 {
4151 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4152 st->print(" ");
4153 if (field.name() != nullptr)
4154 field.name()->print_symbol_on(st);
4155 else
4156 st->print("<UNKNOWN>");
4157 }
4158 default:
4159 break;
4160 }
4161 }
4162 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4163 }
4164
4165 // Print all scopes
4166 for (;sd != nullptr; sd = sd->sender()) {
4167 st->move_to(column, 6, 0);
4168 st->print("; -");
4169 if (sd->should_reexecute()) {
4170 st->print(" (reexecute)");
4171 }
4172 if (sd->method() == nullptr) {
4173 st->print("method is nullptr");
4174 } else {
4175 sd->method()->print_short_name(st);
4176 }
4177 int lineno = sd->method()->line_number_from_bci(sd->bci());
4178 if (lineno != -1) {
4179 st->print("@%d (line %d)", sd->bci(), lineno);
4180 } else {
4181 st->print("@%d", sd->bci());
4182 }
4183 st->cr();
4184 }
4185 }
4186
4187 // Print relocation information
4188 // Prevent memory leak: allocating without ResourceMark.
4189 ResourceMark rm;
4190 const char* str = reloc_string_for(begin, end);
4191 if (str != nullptr) {
4192 if (sd != nullptr) st->cr();
4193 st->move_to(column, 6, 0);
4194 st->print("; {%s}", str);
4195 }
4196 }
4197
4198 #endif
4199
4200 address nmethod::call_instruction_address(address pc) const {
4201 if (NativeCall::is_call_before(pc)) {
4202 NativeCall *ncall = nativeCall_before(pc);
4203 return ncall->instruction_address();
4204 }
4205 return nullptr;
4206 }
4207
4208 void nmethod::print_value_on_impl(outputStream* st) const {
4209 st->print_cr("nmethod");
4210 #if defined(SUPPORT_DATA_STRUCTS)
4211 print_on_with_msg(st, nullptr);
4212 #endif
4213 }
4214
4215 #ifndef PRODUCT
4216
4217 void nmethod::print_calls(outputStream* st) {
4218 RelocIterator iter(this);
4219 while (iter.next()) {
4220 switch (iter.type()) {
4221 case relocInfo::virtual_call_type: {
4222 CompiledICLocker ml_verify(this);
4223 CompiledIC_at(&iter)->print();
4224 break;
4225 }
4226 case relocInfo::static_call_type:
4227 case relocInfo::opt_virtual_call_type:
4228 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4229 CompiledDirectCall::at(iter.reloc())->print();
4230 break;
4231 default:
4232 break;
4233 }
4234 }
4235 }
4236
4237 void nmethod::print_statistics() {
4238 ttyLocker ttyl;
4239 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4240 native_nmethod_stats.print_native_nmethod_stats();
4241 #ifdef COMPILER1
4242 c1_java_nmethod_stats.print_nmethod_stats("C1");
4243 #endif
4244 #ifdef COMPILER2
4245 c2_java_nmethod_stats.print_nmethod_stats("C2");
4246 #endif
4247 #if INCLUDE_JVMCI
4248 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4249 #endif
4250 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4251 DebugInformationRecorder::print_statistics();
4252 pc_nmethod_stats.print_pc_stats();
4253 Dependencies::print_statistics();
4254 ExternalsRecorder::print_statistics();
4255 if (xtty != nullptr) xtty->tail("statistics");
4256 }
4257
4258 #endif // !PRODUCT
4259
4260 #if INCLUDE_JVMCI
4261 void nmethod::update_speculation(JavaThread* thread) {
4262 jlong speculation = thread->pending_failed_speculation();
4263 if (speculation != 0) {
4264 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4265 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4266 thread->set_pending_failed_speculation(0);
4267 }
4268 }
4269
4270 const char* nmethod::jvmci_name() {
4271 if (jvmci_nmethod_data() != nullptr) {
4272 return jvmci_nmethod_data()->name();
4273 }
4274 return nullptr;
4275 }
4276 #endif
4277
4278 void nmethod::prepare_for_archiving() {
4279 CodeBlob::prepare_for_archiving();
4280 _deoptimization_generation = 0;
4281 _gc_epoch = 0;
4282 _method_profiling_count = 0;
4283 _osr_link = nullptr;
4284 _method = nullptr;
4285 _immutable_data = nullptr;
4286 _pc_desc_container = nullptr;
4287 _exception_cache = nullptr;
4288 _gc_data = nullptr;
4289 _oops_do_mark_link = nullptr;
4290 _compiled_ic_data = nullptr;
4291 _osr_entry_point = nullptr;
4292 _compile_id = -1;
4293 _deoptimization_status = not_marked;
4294 _is_unloading_state = 0;
4295 _state = not_installed;
4296 }