1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.inline.hpp"
26 #include "code/aotCodeCache.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.inline.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "compiler/oopMap.inline.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/barrierSetNMethod.hpp"
45 #include "gc/shared/classUnloadingContext.hpp"
46 #include "gc/shared/collectedHeap.hpp"
47 #include "interpreter/bytecode.inline.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/weakHandle.inline.hpp"
60 #include "prims/jvmtiImpl.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/atomicAccess.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/orderAccess.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/serviceThread.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/threadWXSetters.inline.hpp"
77 #include "runtime/vmThread.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/dtrace.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/hashTable.hpp"
84 #include "utilities/xmlstream.hpp"
85 #if INCLUDE_JVMCI
86 #include "jvmci/jvmciRuntime.hpp"
87 #endif
88
89 #ifdef DTRACE_ENABLED
90
91 // Only bother with this argument setup if dtrace is available
92
93 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
94 { \
95 Method* m = (method); \
96 if (m != nullptr) { \
97 Symbol* klass_name = m->klass_name(); \
98 Symbol* name = m->name(); \
99 Symbol* signature = m->signature(); \
100 HOTSPOT_COMPILED_METHOD_UNLOAD( \
101 (char *) klass_name->bytes(), klass_name->utf8_length(), \
102 (char *) name->bytes(), name->utf8_length(), \
103 (char *) signature->bytes(), signature->utf8_length()); \
104 } \
105 }
106
107 #else // ndef DTRACE_ENABLED
108
109 #define DTRACE_METHOD_UNLOAD_PROBE(method)
110
111 #endif
112
113 // Cast from int value to narrow type
114 #define CHECKED_CAST(result, T, thing) \
115 result = static_cast<T>(thing); \
116 guarantee(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing);
117
118 //---------------------------------------------------------------------------------
119 // NMethod statistics
120 // They are printed under various flags, including:
121 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
122 // (In the latter two cases, they like other stats are printed to the log only.)
123
124 #ifndef PRODUCT
125 // These variables are put into one block to reduce relocations
126 // and make it simpler to print from the debugger.
127 struct java_nmethod_stats_struct {
128 uint nmethod_count;
129 uint total_nm_size;
130 uint total_immut_size;
131 uint total_mut_size;
132 uint relocation_size;
133 uint consts_size;
134 uint insts_size;
135 uint stub_size;
136 uint oops_size;
137 uint metadata_size;
138 uint dependencies_size;
139 uint nul_chk_table_size;
140 uint handler_table_size;
141 uint scopes_pcs_size;
142 uint scopes_data_size;
143 #if INCLUDE_JVMCI
144 uint speculations_size;
145 uint jvmci_data_size;
146 #endif
147
148 void note_nmethod(nmethod* nm) {
149 nmethod_count += 1;
150 total_nm_size += nm->size();
151 total_immut_size += nm->immutable_data_size();
152 total_mut_size += nm->mutable_data_size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 #if INCLUDE_JVMCI
165 speculations_size += nm->speculations_size();
166 jvmci_data_size += nm->jvmci_data_size();
167 #endif
168 }
169 void print_nmethod_stats(const char* name) {
170 if (nmethod_count == 0) return;
171 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
172 uint total_size = total_nm_size + total_immut_size + total_mut_size;
173 if (total_nm_size != 0) {
174 tty->print_cr(" total size = %u (100%%)", total_size);
175 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
176 }
177 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
178 if (nmethod_count != 0) {
179 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
180 }
181 if (consts_size != 0) {
182 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
183 }
184 if (insts_size != 0) {
185 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
186 }
187 if (stub_size != 0) {
188 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
189 }
190 if (oops_size != 0) {
191 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
192 }
193 if (total_mut_size != 0) {
194 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
195 }
196 if (relocation_size != 0) {
197 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
198 }
199 if (metadata_size != 0) {
200 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
201 }
202 #if INCLUDE_JVMCI
203 if (jvmci_data_size != 0) {
204 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_mut_size);
205 }
206 #endif
207 if (total_immut_size != 0) {
208 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
209 }
210 if (dependencies_size != 0) {
211 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
212 }
213 if (nul_chk_table_size != 0) {
214 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
215 }
216 if (handler_table_size != 0) {
217 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
218 }
219 if (scopes_pcs_size != 0) {
220 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
221 }
222 if (scopes_data_size != 0) {
223 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
224 }
225 #if INCLUDE_JVMCI
226 if (speculations_size != 0) {
227 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size);
228 }
229 #endif
230 }
231 };
232
233 struct native_nmethod_stats_struct {
234 uint native_nmethod_count;
235 uint native_total_size;
236 uint native_relocation_size;
237 uint native_insts_size;
238 uint native_oops_size;
239 uint native_metadata_size;
240 void note_native_nmethod(nmethod* nm) {
241 native_nmethod_count += 1;
242 native_total_size += nm->size();
243 native_relocation_size += nm->relocation_size();
244 native_insts_size += nm->insts_size();
245 native_oops_size += nm->oops_size();
246 native_metadata_size += nm->metadata_size();
247 }
248 void print_native_nmethod_stats() {
249 if (native_nmethod_count == 0) return;
250 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
251 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
252 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
253 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
254 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
255 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
256 }
257 };
258
259 struct pc_nmethod_stats_struct {
260 uint pc_desc_init; // number of initialization of cache (= number of caches)
261 uint pc_desc_queries; // queries to nmethod::find_pc_desc
262 uint pc_desc_approx; // number of those which have approximate true
263 uint pc_desc_repeats; // number of _pc_descs[0] hits
264 uint pc_desc_hits; // number of LRU cache hits
265 uint pc_desc_tests; // total number of PcDesc examinations
266 uint pc_desc_searches; // total number of quasi-binary search steps
267 uint pc_desc_adds; // number of LUR cache insertions
268
269 void print_pc_stats() {
270 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
271 pc_desc_queries,
272 (double)(pc_desc_tests + pc_desc_searches)
273 / pc_desc_queries);
274 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
275 pc_desc_init,
276 pc_desc_queries, pc_desc_approx,
277 pc_desc_repeats, pc_desc_hits,
278 pc_desc_tests, pc_desc_searches, pc_desc_adds);
279 }
280 };
281
282 #ifdef COMPILER1
283 static java_nmethod_stats_struct c1_java_nmethod_stats;
284 #endif
285 #ifdef COMPILER2
286 static java_nmethod_stats_struct c2_java_nmethod_stats;
287 #endif
288 #if INCLUDE_JVMCI
289 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
290 #endif
291 static java_nmethod_stats_struct unknown_java_nmethod_stats;
292
293 static native_nmethod_stats_struct native_nmethod_stats;
294 static pc_nmethod_stats_struct pc_nmethod_stats;
295
296 static void note_java_nmethod(nmethod* nm) {
297 #ifdef COMPILER1
298 if (nm->is_compiled_by_c1()) {
299 c1_java_nmethod_stats.note_nmethod(nm);
300 } else
301 #endif
302 #ifdef COMPILER2
303 if (nm->is_compiled_by_c2()) {
304 c2_java_nmethod_stats.note_nmethod(nm);
305 } else
306 #endif
307 #if INCLUDE_JVMCI
308 if (nm->is_compiled_by_jvmci()) {
309 jvmci_java_nmethod_stats.note_nmethod(nm);
310 } else
311 #endif
312 {
313 unknown_java_nmethod_stats.note_nmethod(nm);
314 }
315 }
316 #endif // !PRODUCT
317
318 //---------------------------------------------------------------------------------
319
320
321 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
322 assert(pc != nullptr, "Must be non null");
323 assert(exception.not_null(), "Must be non null");
324 assert(handler != nullptr, "Must be non null");
325
326 _count = 0;
327 _exception_type = exception->klass();
328 _next = nullptr;
329 _purge_list_next = nullptr;
330
331 add_address_and_handler(pc,handler);
332 }
333
334
335 address ExceptionCache::match(Handle exception, address pc) {
336 assert(pc != nullptr,"Must be non null");
337 assert(exception.not_null(),"Must be non null");
338 if (exception->klass() == exception_type()) {
339 return (test_address(pc));
340 }
341
342 return nullptr;
343 }
344
345
346 bool ExceptionCache::match_exception_with_space(Handle exception) {
347 assert(exception.not_null(),"Must be non null");
348 if (exception->klass() == exception_type() && count() < cache_size) {
349 return true;
350 }
351 return false;
352 }
353
354
355 address ExceptionCache::test_address(address addr) {
356 int limit = count();
357 for (int i = 0; i < limit; i++) {
358 if (pc_at(i) == addr) {
359 return handler_at(i);
360 }
361 }
362 return nullptr;
363 }
364
365
366 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
367 if (test_address(addr) == handler) return true;
368
369 int index = count();
370 if (index < cache_size) {
371 set_pc_at(index, addr);
372 set_handler_at(index, handler);
373 increment_count();
374 return true;
375 }
376 return false;
377 }
378
379 ExceptionCache* ExceptionCache::next() {
380 return AtomicAccess::load(&_next);
381 }
382
383 void ExceptionCache::set_next(ExceptionCache *ec) {
384 AtomicAccess::store(&_next, ec);
385 }
386
387 //-----------------------------------------------------------------------------
388
389
390 // Helper used by both find_pc_desc methods.
391 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
393 if (!approximate) {
394 return pc->pc_offset() == pc_offset;
395 } else {
396 // Do not look before the sentinel
397 assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
398 return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
399 }
400 }
401
402 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
403 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
404 // initialize the cache by filling it with benign (non-null) values
405 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
406 "must start with a sentinel");
407 for (int i = 0; i < cache_size; i++) {
408 _pc_descs[i] = initial_pc_desc;
409 }
410 }
411
412 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
413 // Note: one might think that caching the most recently
414 // read value separately would be a win, but one would be
415 // wrong. When many threads are updating it, the cache
416 // line it's in would bounce between caches, negating
417 // any benefit.
418
419 // In order to prevent race conditions do not load cache elements
420 // repeatedly, but use a local copy:
421 PcDesc* res;
422
423 // Step one: Check the most recently added value.
424 res = _pc_descs[0];
425 assert(res != nullptr, "PcDesc cache should be initialized already");
426
427 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
428 if (approximate && match_desc(res, pc_offset, approximate)) {
429 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
430 return res;
431 }
432
433 // Step two: Check the rest of the LRU cache.
434 for (int i = 1; i < cache_size; ++i) {
435 res = _pc_descs[i];
436 if (res->pc_offset() < 0) break; // optimization: skip empty cache
437 if (match_desc(res, pc_offset, approximate)) {
438 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
439 return res;
440 }
441 }
442
443 // Report failure.
444 return nullptr;
445 }
446
447 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
448 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
449 // Update the LRU cache by shifting pc_desc forward.
450 for (int i = 0; i < cache_size; i++) {
451 PcDesc* next = _pc_descs[i];
452 _pc_descs[i] = pc_desc;
453 pc_desc = next;
454 }
455 }
456
457 // adjust pcs_size so that it is a multiple of both oopSize and
458 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
459 // of oopSize, then 2*sizeof(PcDesc) is)
460 static int adjust_pcs_size(int pcs_size) {
461 int nsize = align_up(pcs_size, oopSize);
462 if ((nsize % sizeof(PcDesc)) != 0) {
463 nsize = pcs_size + sizeof(PcDesc);
464 }
465 assert((nsize % oopSize) == 0, "correct alignment");
466 return nsize;
467 }
468
469 bool nmethod::is_method_handle_return(address return_pc) {
470 if (!has_method_handle_invokes()) return false;
471 PcDesc* pd = pc_desc_at(return_pc);
472 if (pd == nullptr)
473 return false;
474 return pd->is_method_handle_invoke();
475 }
476
477 // Returns a string version of the method state.
478 const char* nmethod::state() const {
479 int state = get_state();
480 switch (state) {
481 case not_installed:
482 return "not installed";
483 case in_use:
484 return "in use";
485 case not_entrant:
486 return "not_entrant";
487 default:
488 fatal("unexpected method state: %d", state);
489 return nullptr;
490 }
491 }
492
493 void nmethod::set_deoptimized_done() {
494 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
495 if (_deoptimization_status != deoptimize_done) { // can't go backwards
496 AtomicAccess::store(&_deoptimization_status, deoptimize_done);
497 }
498 }
499
500 ExceptionCache* nmethod::exception_cache_acquire() const {
501 return AtomicAccess::load_acquire(&_exception_cache);
502 }
503
504 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
505 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
506 assert(new_entry != nullptr,"Must be non null");
507 assert(new_entry->next() == nullptr, "Must be null");
508
509 for (;;) {
510 ExceptionCache *ec = exception_cache();
511 if (ec != nullptr) {
512 Klass* ex_klass = ec->exception_type();
513 if (!ex_klass->is_loader_alive()) {
514 // We must guarantee that entries are not inserted with new next pointer
515 // edges to ExceptionCache entries with dead klasses, due to bad interactions
516 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
517 // the head pointer forward to the first live ExceptionCache, so that the new
518 // next pointers always point at live ExceptionCaches, that are not removed due
519 // to concurrent ExceptionCache cleanup.
520 ExceptionCache* next = ec->next();
521 if (AtomicAccess::cmpxchg(&_exception_cache, ec, next) == ec) {
522 CodeCache::release_exception_cache(ec);
523 }
524 continue;
525 }
526 ec = exception_cache();
527 if (ec != nullptr) {
528 new_entry->set_next(ec);
529 }
530 }
531 if (AtomicAccess::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
532 return;
533 }
534 }
535 }
536
537 void nmethod::clean_exception_cache() {
538 // For each nmethod, only a single thread may call this cleanup function
539 // at the same time, whether called in STW cleanup or concurrent cleanup.
540 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
541 // then a single writer may contend with cleaning up the head pointer to the
542 // first ExceptionCache node that has a Klass* that is alive. That is fine,
543 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
544 // And the concurrent writers do not clean up next pointers, only the head.
545 // Also note that concurrent readers will walk through Klass* pointers that are not
546 // alive. That does not cause ABA problems, because Klass* is deleted after
547 // a handshake with all threads, after all stale ExceptionCaches have been
548 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
549 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
550 // That similarly implies that CAS operations on ExceptionCache entries do not
551 // suffer from ABA problems as unlinking and deletion is separated by a global
552 // handshake operation.
553 ExceptionCache* prev = nullptr;
554 ExceptionCache* curr = exception_cache_acquire();
555
556 while (curr != nullptr) {
557 ExceptionCache* next = curr->next();
558
559 if (!curr->exception_type()->is_loader_alive()) {
560 if (prev == nullptr) {
561 // Try to clean head; this is contended by concurrent inserts, that
562 // both lazily clean the head, and insert entries at the head. If
563 // the CAS fails, the operation is restarted.
564 if (AtomicAccess::cmpxchg(&_exception_cache, curr, next) != curr) {
565 prev = nullptr;
566 curr = exception_cache_acquire();
567 continue;
568 }
569 } else {
570 // It is impossible to during cleanup connect the next pointer to
571 // an ExceptionCache that has not been published before a safepoint
572 // prior to the cleanup. Therefore, release is not required.
573 prev->set_next(next);
574 }
575 // prev stays the same.
576
577 CodeCache::release_exception_cache(curr);
578 } else {
579 prev = curr;
580 }
581
582 curr = next;
583 }
584 }
585
586 // public method for accessing the exception cache
587 // These are the public access methods.
588 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
589 // We never grab a lock to read the exception cache, so we may
590 // have false negatives. This is okay, as it can only happen during
591 // the first few exception lookups for a given nmethod.
592 ExceptionCache* ec = exception_cache_acquire();
593 while (ec != nullptr) {
594 address ret_val;
595 if ((ret_val = ec->match(exception,pc)) != nullptr) {
596 return ret_val;
597 }
598 ec = ec->next();
599 }
600 return nullptr;
601 }
602
603 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
604 // There are potential race conditions during exception cache updates, so we
605 // must own the ExceptionCache_lock before doing ANY modifications. Because
606 // we don't lock during reads, it is possible to have several threads attempt
607 // to update the cache with the same data. We need to check for already inserted
608 // copies of the current data before adding it.
609
610 MutexLocker ml(ExceptionCache_lock);
611 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
612
613 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
614 target_entry = new ExceptionCache(exception,pc,handler);
615 add_exception_cache_entry(target_entry);
616 }
617 }
618
619 // private method for handling exception cache
620 // These methods are private, and used to manipulate the exception cache
621 // directly.
622 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
623 ExceptionCache* ec = exception_cache_acquire();
624 while (ec != nullptr) {
625 if (ec->match_exception_with_space(exception)) {
626 return ec;
627 }
628 ec = ec->next();
629 }
630 return nullptr;
631 }
632
633 bool nmethod::is_at_poll_return(address pc) {
634 RelocIterator iter(this, pc, pc+1);
635 while (iter.next()) {
636 if (iter.type() == relocInfo::poll_return_type)
637 return true;
638 }
639 return false;
640 }
641
642
643 bool nmethod::is_at_poll_or_poll_return(address pc) {
644 RelocIterator iter(this, pc, pc+1);
645 while (iter.next()) {
646 relocInfo::relocType t = iter.type();
647 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
648 return true;
649 }
650 return false;
651 }
652
653 void nmethod::verify_oop_relocations() {
654 // Ensure sure that the code matches the current oop values
655 RelocIterator iter(this, nullptr, nullptr);
656 while (iter.next()) {
657 if (iter.type() == relocInfo::oop_type) {
658 oop_Relocation* reloc = iter.oop_reloc();
659 if (!reloc->oop_is_immediate()) {
660 reloc->verify_oop_relocation();
661 }
662 }
663 }
664 }
665
666
667 ScopeDesc* nmethod::scope_desc_at(address pc) {
668 PcDesc* pd = pc_desc_at(pc);
669 guarantee(pd != nullptr, "scope must be present");
670 return new ScopeDesc(this, pd);
671 }
672
673 ScopeDesc* nmethod::scope_desc_near(address pc) {
674 PcDesc* pd = pc_desc_near(pc);
675 guarantee(pd != nullptr, "scope must be present");
676 return new ScopeDesc(this, pd);
677 }
678
679 address nmethod::oops_reloc_begin() const {
680 // If the method is not entrant then a JMP is plastered over the
681 // first few bytes. If an oop in the old code was there, that oop
682 // should not get GC'd. Skip the first few bytes of oops on
683 // not-entrant methods.
684 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
685 code_begin() + frame_complete_offset() >
686 verified_entry_point() + NativeJump::instruction_size)
687 {
688 // If we have a frame_complete_offset after the native jump, then there
689 // is no point trying to look for oops before that. This is a requirement
690 // for being allowed to scan oops concurrently.
691 return code_begin() + frame_complete_offset();
692 }
693
694 address low_boundary = verified_entry_point();
695 return low_boundary;
696 }
697
698 // Method that knows how to preserve outgoing arguments at call. This method must be
699 // called with a frame corresponding to a Java invoke
700 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
701 if (method() == nullptr) {
702 return;
703 }
704
705 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
706 JavaThread* thread = reg_map->thread();
707 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
708 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
709 return;
710 }
711
712 if (!method()->is_native()) {
713 address pc = fr.pc();
714 bool has_receiver, has_appendix;
715 Symbol* signature;
716
717 // The method attached by JIT-compilers should be used, if present.
718 // Bytecode can be inaccurate in such case.
719 Method* callee = attached_method_before_pc(pc);
720 if (callee != nullptr) {
721 has_receiver = !(callee->access_flags().is_static());
722 has_appendix = false;
723 signature = callee->signature();
724 } else {
725 SimpleScopeDesc ssd(this, pc);
726
727 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
728 has_receiver = call.has_receiver();
729 has_appendix = call.has_appendix();
730 signature = call.signature();
731 }
732
733 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
734 } else if (method()->is_continuation_enter_intrinsic()) {
735 // This method only calls Continuation.enter()
736 Symbol* signature = vmSymbols::continuationEnter_signature();
737 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
738 }
739 }
740
741 Method* nmethod::attached_method(address call_instr) {
742 assert(code_contains(call_instr), "not part of the nmethod");
743 RelocIterator iter(this, call_instr, call_instr + 1);
744 while (iter.next()) {
745 if (iter.addr() == call_instr) {
746 switch(iter.type()) {
747 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
748 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
749 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
750 default: break;
751 }
752 }
753 }
754 return nullptr; // not found
755 }
756
757 Method* nmethod::attached_method_before_pc(address pc) {
758 if (NativeCall::is_call_before(pc)) {
759 NativeCall* ncall = nativeCall_before(pc);
760 return attached_method(ncall->instruction_address());
761 }
762 return nullptr; // not a call
763 }
764
765 void nmethod::clear_inline_caches() {
766 assert(SafepointSynchronize::is_at_safepoint(), "clearing of IC's only allowed at safepoint");
767 RelocIterator iter(this);
768 while (iter.next()) {
769 iter.reloc()->clear_inline_cache();
770 }
771 }
772
773 #ifdef ASSERT
774 // Check class_loader is alive for this bit of metadata.
775 class CheckClass : public MetadataClosure {
776 void do_metadata(Metadata* md) {
777 Klass* klass = nullptr;
778 if (md->is_klass()) {
779 klass = ((Klass*)md);
780 } else if (md->is_method()) {
781 klass = ((Method*)md)->method_holder();
782 } else if (md->is_methodData()) {
783 klass = ((MethodData*)md)->method()->method_holder();
784 } else if (md->is_methodCounters()) {
785 klass = ((MethodCounters*)md)->method()->method_holder();
786 } else {
787 md->print();
788 ShouldNotReachHere();
789 }
790 assert(klass->is_loader_alive(), "must be alive");
791 }
792 };
793 #endif // ASSERT
794
795
796 static void clean_ic_if_metadata_is_dead(CompiledIC *ic) {
797 ic->clean_metadata();
798 }
799
800 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
801 template <typename CallsiteT>
802 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, nmethod* from,
803 bool clean_all) {
804 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
805 if (!cb->is_nmethod()) {
806 return;
807 }
808 nmethod* nm = cb->as_nmethod();
809 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
810 callsite->set_to_clean();
811 }
812 }
813
814 // Cleans caches in nmethods that point to either classes that are unloaded
815 // or nmethods that are unloaded.
816 //
817 // Can be called either in parallel by G1 currently or after all
818 // nmethods are unloaded. Return postponed=true in the parallel case for
819 // inline caches found that point to nmethods that are not yet visited during
820 // the do_unloading walk.
821 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
822 ResourceMark rm;
823
824 // Exception cache only needs to be called if unloading occurred
825 if (unloading_occurred) {
826 clean_exception_cache();
827 }
828
829 cleanup_inline_caches_impl(unloading_occurred, false);
830
831 #ifdef ASSERT
832 // Check that the metadata embedded in the nmethod is alive
833 CheckClass check_class;
834 metadata_do(&check_class);
835 #endif
836 }
837
838 void nmethod::run_nmethod_entry_barrier() {
839 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
840 if (bs_nm != nullptr) {
841 // We want to keep an invariant that nmethods found through iterations of a Thread's
842 // nmethods found in safepoints have gone through an entry barrier and are not armed.
843 // By calling this nmethod entry barrier, it plays along and acts
844 // like any other nmethod found on the stack of a thread (fewer surprises).
845 nmethod* nm = this;
846 bool alive = bs_nm->nmethod_entry_barrier(nm);
847 assert(alive, "should be alive");
848 }
849 }
850
851 // Only called by whitebox test
852 void nmethod::cleanup_inline_caches_whitebox() {
853 assert_locked_or_safepoint(CodeCache_lock);
854 CompiledICLocker ic_locker(this);
855 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
856 }
857
858 address* nmethod::orig_pc_addr(const frame* fr) {
859 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
860 }
861
862 // Called to clean up after class unloading for live nmethods
863 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
864 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
865 ResourceMark rm;
866
867 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
868 RelocIterator iter(this, oops_reloc_begin());
869 bool is_in_static_stub = false;
870 while(iter.next()) {
871
872 switch (iter.type()) {
873
874 case relocInfo::virtual_call_type:
875 if (unloading_occurred) {
876 // If class unloading occurred we first clear ICs where the cached metadata
877 // is referring to an unloaded klass or method.
878 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter));
879 }
880
881 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, clean_all);
882 break;
883
884 case relocInfo::opt_virtual_call_type:
885 case relocInfo::static_call_type:
886 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), this, clean_all);
887 break;
888
889 case relocInfo::static_stub_type: {
890 is_in_static_stub = true;
891 break;
892 }
893
894 case relocInfo::metadata_type: {
895 // Only the metadata relocations contained in static/opt virtual call stubs
896 // contains the Method* passed to c2i adapters. It is the only metadata
897 // relocation that needs to be walked, as it is the one metadata relocation
898 // that violates the invariant that all metadata relocations have an oop
899 // in the compiled method (due to deferred resolution and code patching).
900
901 // This causes dead metadata to remain in compiled methods that are not
902 // unloading. Unless these slippery metadata relocations of the static
903 // stubs are at least cleared, subsequent class redefinition operations
904 // will access potentially free memory, and JavaThread execution
905 // concurrent to class unloading may call c2i adapters with dead methods.
906 if (!is_in_static_stub) {
907 // The first metadata relocation after a static stub relocation is the
908 // metadata relocation of the static stub used to pass the Method* to
909 // c2i adapters.
910 continue;
911 }
912 is_in_static_stub = false;
913 if (is_unloading()) {
914 // If the nmethod itself is dying, then it may point at dead metadata.
915 // Nobody should follow that metadata; it is strictly unsafe.
916 continue;
917 }
918 metadata_Relocation* r = iter.metadata_reloc();
919 Metadata* md = r->metadata_value();
920 if (md != nullptr && md->is_method()) {
921 Method* method = static_cast<Method*>(md);
922 if (!method->method_holder()->is_loader_alive()) {
923 AtomicAccess::store(r->metadata_addr(), (Method*)nullptr);
924
925 if (!r->metadata_is_immediate()) {
926 r->fix_metadata_relocation();
927 }
928 }
929 }
930 break;
931 }
932
933 default:
934 break;
935 }
936 }
937 }
938
939 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
940 // Exception happened outside inline-cache check code => we are inside
941 // an active nmethod => use cpc to determine a return address
942 int exception_offset = int(pc - code_begin());
943 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
944 #ifdef ASSERT
945 if (cont_offset == 0) {
946 Thread* thread = Thread::current();
947 ResourceMark rm(thread);
948 CodeBlob* cb = CodeCache::find_blob(pc);
949 assert(cb != nullptr && cb == this, "");
950
951 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
952 stringStream ss;
953 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
954 print_on(&ss);
955 method()->print_codes_on(&ss);
956 print_code_on(&ss);
957 print_pcs_on(&ss);
958 tty->print("%s", ss.as_string()); // print all at once
959 }
960 #endif
961 if (cont_offset == 0) {
962 // Let the normal error handling report the exception
963 return nullptr;
964 }
965 if (cont_offset == exception_offset) {
966 #if INCLUDE_JVMCI
967 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
968 JavaThread *thread = JavaThread::current();
969 thread->set_jvmci_implicit_exception_pc(pc);
970 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
971 Deoptimization::Action_reinterpret));
972 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
973 #else
974 ShouldNotReachHere();
975 #endif
976 }
977 return code_begin() + cont_offset;
978 }
979
980 class HasEvolDependency : public MetadataClosure {
981 bool _has_evol_dependency;
982 public:
983 HasEvolDependency() : _has_evol_dependency(false) {}
984 void do_metadata(Metadata* md) {
985 if (md->is_method()) {
986 Method* method = (Method*)md;
987 if (method->is_old()) {
988 _has_evol_dependency = true;
989 }
990 }
991 }
992 bool has_evol_dependency() const { return _has_evol_dependency; }
993 };
994
995 bool nmethod::has_evol_metadata() {
996 // Check the metadata in relocIter and CompiledIC and also deoptimize
997 // any nmethod that has reference to old methods.
998 HasEvolDependency check_evol;
999 metadata_do(&check_evol);
1000 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
1001 ResourceMark rm;
1002 log_debug(redefine, class, nmethod)
1003 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
1004 _method->method_holder()->external_name(),
1005 _method->name()->as_C_string(),
1006 _method->signature()->as_C_string(),
1007 compile_id());
1008 }
1009 return check_evol.has_evol_dependency();
1010 }
1011
1012 int nmethod::total_size() const {
1013 return
1014 consts_size() +
1015 insts_size() +
1016 stub_size() +
1017 scopes_data_size() +
1018 scopes_pcs_size() +
1019 handler_table_size() +
1020 nul_chk_table_size();
1021 }
1022
1023 const char* nmethod::compile_kind() const {
1024 if (is_osr_method()) return "osr";
1025 if (preloaded()) return "AP";
1026 if (is_aot()) return "A";
1027
1028 if (method() != nullptr && is_native_method()) {
1029 if (method()->is_continuation_native_intrinsic()) {
1030 return "cnt";
1031 }
1032 return "c2n";
1033 }
1034 return nullptr;
1035 }
1036
1037 const char* nmethod::compiler_name() const {
1038 return compilertype2name(_compiler_type);
1039 }
1040
1041 #ifdef ASSERT
1042 class CheckForOopsClosure : public OopClosure {
1043 bool _found_oop = false;
1044 public:
1045 virtual void do_oop(oop* o) { _found_oop = true; }
1046 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1047 bool found_oop() { return _found_oop; }
1048 };
1049 class CheckForMetadataClosure : public MetadataClosure {
1050 bool _found_metadata = false;
1051 Metadata* _ignore = nullptr;
1052 public:
1053 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1054 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1055 bool found_metadata() { return _found_metadata; }
1056 };
1057
1058 static void assert_no_oops_or_metadata(nmethod* nm) {
1059 if (nm == nullptr) return;
1060 assert(nm->oop_maps() == nullptr, "expectation");
1061
1062 CheckForOopsClosure cfo;
1063 nm->oops_do(&cfo);
1064 assert(!cfo.found_oop(), "no oops allowed");
1065
1066 // We allow an exception for the own Method, but require its class to be permanent.
1067 Method* own_method = nm->method();
1068 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1069 nm->metadata_do(&cfm);
1070 assert(!cfm.found_metadata(), "no metadata allowed");
1071
1072 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1073 "Method's class needs to be permanent");
1074 }
1075 #endif
1076
1077 static int required_mutable_data_size(CodeBuffer* code_buffer,
1078 int jvmci_data_size = 0) {
1079 return align_up(code_buffer->total_relocation_size(), oopSize) +
1080 align_up(code_buffer->total_metadata_size(), oopSize) +
1081 align_up(jvmci_data_size, oopSize);
1082 }
1083
1084 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1085 int compile_id,
1086 CodeBuffer *code_buffer,
1087 int vep_offset,
1088 int frame_complete,
1089 int frame_size,
1090 ByteSize basic_lock_owner_sp_offset,
1091 ByteSize basic_lock_sp_offset,
1092 OopMapSet* oop_maps,
1093 int exception_handler) {
1094 code_buffer->finalize_oop_references(method);
1095 // create nmethod
1096 nmethod* nm = nullptr;
1097 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1098 {
1099 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1100
1101 CodeOffsets offsets;
1102 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1103 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1104 if (exception_handler != -1) {
1105 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1106 }
1107
1108 int mutable_data_size = required_mutable_data_size(code_buffer);
1109
1110 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1111 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1112 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1113 nm = new (native_nmethod_size, allow_NonNMethod_space)
1114 nmethod(method(), compiler_none, native_nmethod_size,
1115 compile_id, &offsets,
1116 code_buffer, frame_size,
1117 basic_lock_owner_sp_offset,
1118 basic_lock_sp_offset,
1119 oop_maps, mutable_data_size);
1120 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1121 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1122 }
1123
1124 if (nm != nullptr) {
1125 // verify nmethod
1126 DEBUG_ONLY(nm->verify();) // might block
1127
1128 nm->log_new_nmethod();
1129 }
1130 return nm;
1131 }
1132
1133 void nmethod::record_nmethod_dependency() {
1134 // To make dependency checking during class loading fast, record
1135 // the nmethod dependencies in the classes it is dependent on.
1136 // This allows the dependency checking code to simply walk the
1137 // class hierarchy above the loaded class, checking only nmethods
1138 // which are dependent on those classes. The slow way is to
1139 // check every nmethod for dependencies which makes it linear in
1140 // the number of methods compiled. For applications with a lot
1141 // classes the slow way is too slow.
1142 for (Dependencies::DepStream deps(this); deps.next(); ) {
1143 if (deps.type() == Dependencies::call_site_target_value) {
1144 // CallSite dependencies are managed on per-CallSite instance basis.
1145 oop call_site = deps.argument_oop(0);
1146 MethodHandles::add_dependent_nmethod(call_site, this);
1147 } else {
1148 InstanceKlass* ik = deps.context_type();
1149 if (ik == nullptr) {
1150 continue; // ignore things like evol_method
1151 }
1152 // record this nmethod as dependent on this klass
1153 ik->add_dependent_nmethod(this);
1154 }
1155 }
1156 }
1157
1158 nmethod* nmethod::new_nmethod(const methodHandle& method,
1159 int compile_id,
1160 int entry_bci,
1161 CodeOffsets* offsets,
1162 int orig_pc_offset,
1163 DebugInformationRecorder* debug_info,
1164 Dependencies* dependencies,
1165 CodeBuffer* code_buffer, int frame_size,
1166 OopMapSet* oop_maps,
1167 ExceptionHandlerTable* handler_table,
1168 ImplicitExceptionTable* nul_chk_table,
1169 AbstractCompiler* compiler,
1170 CompLevel comp_level
1171 #if INCLUDE_JVMCI
1172 , char* speculations,
1173 int speculations_len,
1174 JVMCINMethodData* jvmci_data
1175 #endif
1176 )
1177 {
1178 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1179 code_buffer->finalize_oop_references(method);
1180 // create nmethod
1181 nmethod* nm = nullptr;
1182 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1183
1184 int immutable_data_size =
1185 adjust_pcs_size(debug_info->pcs_size())
1186 + align_up((int)dependencies->size_in_bytes(), oopSize)
1187 + align_up(handler_table->size_in_bytes() , oopSize)
1188 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1189 #if INCLUDE_JVMCI
1190 + align_up(speculations_len , oopSize)
1191 #endif
1192 + align_up(debug_info->data_size() , oopSize);
1193
1194 // First, allocate space for immutable data in C heap.
1195 address immutable_data = nullptr;
1196 if (immutable_data_size > 0) {
1197 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1198 if (immutable_data == nullptr) {
1199 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1200 return nullptr;
1201 }
1202 }
1203
1204 int mutable_data_size = required_mutable_data_size(code_buffer
1205 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1206
1207 {
1208 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1209
1210 nm = new (nmethod_size, comp_level)
1211 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1212 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1213 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1214 handler_table, nul_chk_table, compiler, comp_level
1215 #if INCLUDE_JVMCI
1216 , speculations,
1217 speculations_len,
1218 jvmci_data
1219 #endif
1220 );
1221
1222 if (nm != nullptr) {
1223 nm->record_nmethod_dependency();
1224 NOT_PRODUCT(note_java_nmethod(nm));
1225 }
1226 }
1227 // Do verification and logging outside CodeCache_lock.
1228 if (nm != nullptr) {
1229
1230 #ifdef ASSERT
1231 LogTarget(Debug, aot, codecache, nmethod) log;
1232 if (log.is_enabled()) {
1233 LogStream out(log);
1234 out.print_cr("== new_nmethod 2");
1235 FlagSetting fs(PrintRelocations, true);
1236 nm->print_on_impl(&out);
1237 nm->decode(&out);
1238 }
1239 #endif
1240
1241 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1242 DEBUG_ONLY(nm->verify();)
1243 nm->log_new_nmethod();
1244 }
1245 return nm;
1246 }
1247
1248 nmethod* nmethod::restore(address code_cache_buffer,
1249 const methodHandle& method,
1250 int compile_id,
1251 address reloc_data,
1252 GrowableArray<Handle>& oop_list,
1253 GrowableArray<Metadata*>& metadata_list,
1254 ImmutableOopMapSet* oop_maps,
1255 address immutable_data,
1256 GrowableArray<Handle>& reloc_imm_oop_list,
1257 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1258 AOTCodeReader* aot_code_reader)
1259 {
1260 CodeBlob::restore(code_cache_buffer, "nmethod", reloc_data, oop_maps);
1261 nmethod* nm = (nmethod*)code_cache_buffer;
1262 nm->set_method(method());
1263 nm->_compile_id = compile_id;
1264 nm->set_immutable_data(immutable_data);
1265 nm->copy_values(&oop_list);
1266 nm->copy_values(&metadata_list);
1267
1268 aot_code_reader->fix_relocations(nm, &reloc_imm_oop_list, &reloc_imm_metadata_list);
1269
1270 #ifndef PRODUCT
1271 nm->asm_remarks().init();
1272 aot_code_reader->read_asm_remarks(nm->asm_remarks(), /* use_string_table */ false);
1273 nm->dbg_strings().init();
1274 aot_code_reader->read_dbg_strings(nm->dbg_strings(), /* use_string_table */ false);
1275 #endif
1276
1277 // Flush the code block
1278 ICache::invalidate_range(nm->code_begin(), nm->code_size());
1279
1280 // Create cache after PcDesc data is copied - it will be used to initialize cache
1281 nm->_pc_desc_container = new PcDescContainer(nm->scopes_pcs_begin());
1282
1283 nm->set_aot_code_entry(aot_code_reader->aot_code_entry());
1284
1285 nm->post_init();
1286 return nm;
1287 }
1288
1289 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1290 const methodHandle& method,
1291 AbstractCompiler* compiler,
1292 int compile_id,
1293 address reloc_data,
1294 GrowableArray<Handle>& oop_list,
1295 GrowableArray<Metadata*>& metadata_list,
1296 ImmutableOopMapSet* oop_maps,
1297 address immutable_data,
1298 GrowableArray<Handle>& reloc_imm_oop_list,
1299 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1300 AOTCodeReader* aot_code_reader)
1301 {
1302 nmethod* nm = nullptr;
1303 int nmethod_size = archived_nm->size();
1304 // create nmethod
1305 {
1306 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1307 address code_cache_buffer = (address)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1308 if (code_cache_buffer != nullptr) {
1309 nm = archived_nm->restore(code_cache_buffer,
1310 method,
1311 compile_id,
1312 reloc_data,
1313 oop_list,
1314 metadata_list,
1315 oop_maps,
1316 immutable_data,
1317 reloc_imm_oop_list,
1318 reloc_imm_metadata_list,
1319 aot_code_reader);
1320 nm->record_nmethod_dependency();
1321 NOT_PRODUCT(note_java_nmethod(nm));
1322 }
1323 }
1324 // Do verification and logging outside CodeCache_lock.
1325 if (nm != nullptr) {
1326 #ifdef ASSERT
1327 LogTarget(Debug, aot, codecache, nmethod) log;
1328 if (log.is_enabled()) {
1329 LogStream out(log);
1330 out.print_cr("== new_nmethod 2");
1331 FlagSetting fs(PrintRelocations, true);
1332 nm->print_on_impl(&out);
1333 nm->decode(&out);
1334 }
1335 #endif
1336 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1337 DEBUG_ONLY(nm->verify();)
1338 nm->log_new_nmethod();
1339 }
1340 return nm;
1341 }
1342
1343 // Fill in default values for various fields
1344 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1345 // avoid uninitialized fields, even for short time periods
1346 _exception_cache = nullptr;
1347 _gc_data = nullptr;
1348 _oops_do_mark_link = nullptr;
1349 _compiled_ic_data = nullptr;
1350
1351 _is_unloading_state = 0;
1352 _state = not_installed;
1353
1354 _has_unsafe_access = 0;
1355 _has_method_handle_invokes = 0;
1356 _has_wide_vectors = 0;
1357 _has_monitors = 0;
1358 _has_scoped_access = 0;
1359 _has_flushed_dependencies = 0;
1360 _is_unlinked = 0;
1361 _load_reported = 0; // jvmti state
1362 _preloaded = 0;
1363 _has_clinit_barriers = 0;
1364
1365 _used = false;
1366 _deoptimization_status = not_marked;
1367
1368 // SECT_CONSTS is first in code buffer so the offset should be 0.
1369 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1370 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1371
1372 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1373
1374 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1375 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1376
1377 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1378 }
1379
1380 // Post initialization
1381 void nmethod::post_init() {
1382 clear_unloading_state();
1383
1384 finalize_relocations();
1385
1386 Universe::heap()->register_nmethod(this);
1387 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1388
1389 CodeCache::commit(this);
1390 }
1391
1392 // For native wrappers
1393 nmethod::nmethod(
1394 Method* method,
1395 CompilerType type,
1396 int nmethod_size,
1397 int compile_id,
1398 CodeOffsets* offsets,
1399 CodeBuffer* code_buffer,
1400 int frame_size,
1401 ByteSize basic_lock_owner_sp_offset,
1402 ByteSize basic_lock_sp_offset,
1403 OopMapSet* oop_maps,
1404 int mutable_data_size)
1405 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1406 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1407 _deoptimization_generation(0),
1408 _gc_epoch(CodeCache::gc_epoch()),
1409 _method(method),
1410 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1411 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1412 {
1413 {
1414 DEBUG_ONLY(NoSafepointVerifier nsv;)
1415 assert_locked_or_safepoint(CodeCache_lock);
1416
1417 init_defaults(code_buffer, offsets);
1418
1419 _osr_entry_point = nullptr;
1420 _pc_desc_container = nullptr;
1421 _entry_bci = InvocationEntryBci;
1422 _compile_id = compile_id;
1423 _comp_level = CompLevel_none;
1424 _compiler_type = type;
1425 _orig_pc_offset = 0;
1426 _num_stack_arg_slots = 0;
1427
1428 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1429 // Continuation enter intrinsic
1430 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1431 } else {
1432 _exception_offset = 0;
1433 }
1434 // Native wrappers do not have deopt handlers. Make the values
1435 // something that will never match a pc like the nmethod vtable entry
1436 _deopt_handler_offset = 0;
1437 _deopt_mh_handler_offset = 0;
1438 _aot_code_entry = nullptr;
1439 _method_profiling_count = 0;
1440 _unwind_handler_offset = 0;
1441
1442 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1443 uint16_t metadata_size;
1444 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1445 JVMCI_ONLY( _metadata_size = metadata_size; )
1446 assert(_mutable_data_size == _relocation_size + metadata_size,
1447 "wrong mutable data size: %d != %d + %d",
1448 _mutable_data_size, _relocation_size, metadata_size);
1449
1450 // native wrapper does not have read-only data but we need unique not null address
1451 _immutable_data = blob_end();
1452 _immutable_data_size = 0;
1453 _nul_chk_table_offset = 0;
1454 _handler_table_offset = 0;
1455 _scopes_pcs_offset = 0;
1456 _scopes_data_offset = 0;
1457 #if INCLUDE_JVMCI
1458 _speculations_offset = 0;
1459 #endif
1460
1461 code_buffer->copy_code_and_locs_to(this);
1462 code_buffer->copy_values_to(this);
1463
1464 post_init();
1465 }
1466
1467 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1468 ttyLocker ttyl; // keep the following output all in one block
1469 // This output goes directly to the tty, not the compiler log.
1470 // To enable tools to match it up with the compilation activity,
1471 // be sure to tag this tty output with the compile ID.
1472 if (xtty != nullptr) {
1473 xtty->begin_head("print_native_nmethod");
1474 xtty->method(_method);
1475 xtty->stamp();
1476 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1477 }
1478 // Print the header part, then print the requested information.
1479 // This is both handled in decode2(), called via print_code() -> decode()
1480 if (PrintNativeNMethods) {
1481 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1482 print_code();
1483 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1484 #if defined(SUPPORT_DATA_STRUCTS)
1485 if (AbstractDisassembler::show_structs()) {
1486 if (oop_maps != nullptr) {
1487 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1488 oop_maps->print_on(tty);
1489 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1490 }
1491 }
1492 #endif
1493 } else {
1494 print(); // print the header part only.
1495 }
1496 #if defined(SUPPORT_DATA_STRUCTS)
1497 if (AbstractDisassembler::show_structs()) {
1498 if (PrintRelocations) {
1499 print_relocations_on(tty);
1500 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1501 }
1502 }
1503 #endif
1504 if (xtty != nullptr) {
1505 xtty->tail("print_native_nmethod");
1506 }
1507 }
1508 }
1509
1510 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1511 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1512 }
1513
1514 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1515 // Try MethodNonProfiled and MethodProfiled.
1516 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1517 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1518 // Try NonNMethod or give up.
1519 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1520 }
1521
1522 // For normal JIT compiled code
1523 nmethod::nmethod(
1524 Method* method,
1525 CompilerType type,
1526 int nmethod_size,
1527 int immutable_data_size,
1528 int mutable_data_size,
1529 int compile_id,
1530 int entry_bci,
1531 address immutable_data,
1532 CodeOffsets* offsets,
1533 int orig_pc_offset,
1534 DebugInformationRecorder* debug_info,
1535 Dependencies* dependencies,
1536 CodeBuffer *code_buffer,
1537 int frame_size,
1538 OopMapSet* oop_maps,
1539 ExceptionHandlerTable* handler_table,
1540 ImplicitExceptionTable* nul_chk_table,
1541 AbstractCompiler* compiler,
1542 CompLevel comp_level
1543 #if INCLUDE_JVMCI
1544 , char* speculations,
1545 int speculations_len,
1546 JVMCINMethodData* jvmci_data
1547 #endif
1548 )
1549 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1550 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1551 _deoptimization_generation(0),
1552 _gc_epoch(CodeCache::gc_epoch()),
1553 _method(method),
1554 _osr_link(nullptr)
1555 {
1556 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1557 {
1558 DEBUG_ONLY(NoSafepointVerifier nsv;)
1559 assert_locked_or_safepoint(CodeCache_lock);
1560
1561 init_defaults(code_buffer, offsets);
1562 _aot_code_entry = nullptr; // runtime compiled nmethod does not have AOTCodeEntry
1563 _method_profiling_count = 0;
1564
1565 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1566 _entry_bci = entry_bci;
1567 _compile_id = compile_id;
1568 _comp_level = comp_level;
1569 _compiler_type = type;
1570 _orig_pc_offset = orig_pc_offset;
1571
1572 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1573
1574 set_ctable_begin(header_begin() + content_offset());
1575
1576 #if INCLUDE_JVMCI
1577 if (compiler->is_jvmci()) {
1578 // JVMCI might not produce any stub sections
1579 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1580 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1581 } else {
1582 _exception_offset = -1;
1583 }
1584 if (offsets->value(CodeOffsets::Deopt) != -1) {
1585 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1586 } else {
1587 _deopt_handler_offset = -1;
1588 }
1589 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1590 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
1591 } else {
1592 _deopt_mh_handler_offset = -1;
1593 }
1594 } else
1595 #endif
1596 {
1597 // Exception handler and deopt handler are in the stub section
1598 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1599 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1600
1601 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1602 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1603 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1604 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
1605 } else {
1606 _deopt_mh_handler_offset = -1;
1607 }
1608 }
1609 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1610 // C1 generates UnwindHandler at the end of instructions section.
1611 // Calculate positive offset as distance between the start of stubs section
1612 // (which is also the end of instructions section) and the start of the handler.
1613 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1614 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1615 } else {
1616 _unwind_handler_offset = -1;
1617 }
1618
1619 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1620 uint16_t metadata_size;
1621 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1622 JVMCI_ONLY( _metadata_size = metadata_size; )
1623 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1624 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1625 "wrong mutable data size: %d != %d + %d + %d",
1626 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1627 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1628 nmethod_size, (int)(code_end() - header_begin()));
1629
1630 _immutable_data_size = immutable_data_size;
1631 if (immutable_data_size > 0) {
1632 assert(immutable_data != nullptr, "required");
1633 _immutable_data = immutable_data;
1634 } else {
1635 // We need unique not null address
1636 _immutable_data = blob_end();
1637 }
1638 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1639 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1640 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1641 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1642
1643 #if INCLUDE_JVMCI
1644 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1645 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); )
1646 #else
1647 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); )
1648 #endif
1649 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1650 immutable_data_end_offset, immutable_data_size);
1651
1652 // Copy code and relocation info
1653 code_buffer->copy_code_and_locs_to(this);
1654 // Copy oops and metadata
1655 code_buffer->copy_values_to(this);
1656 dependencies->copy_to(this);
1657 // Copy PcDesc and ScopeDesc data
1658 debug_info->copy_to(this);
1659
1660 // Create cache after PcDesc data is copied - it will be used to initialize cache
1661 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1662
1663 #if INCLUDE_JVMCI
1664 if (compiler->is_jvmci()) {
1665 // Initialize the JVMCINMethodData object inlined into nm
1666 jvmci_nmethod_data()->copy(jvmci_data);
1667 }
1668 #endif
1669
1670 // Copy contents of ExceptionHandlerTable to nmethod
1671 handler_table->copy_to(this);
1672 nul_chk_table->copy_to(this);
1673
1674 #if INCLUDE_JVMCI
1675 // Copy speculations to nmethod
1676 if (speculations_size() != 0) {
1677 memcpy(speculations_begin(), speculations, speculations_len);
1678 }
1679 #endif
1680
1681 post_init();
1682
1683 // we use the information of entry points to find out if a method is
1684 // static or non static
1685 assert(compiler->is_c2() || compiler->is_jvmci() ||
1686 _method->is_static() == (entry_point() == verified_entry_point()),
1687 " entry points must be same for static methods and vice versa");
1688 }
1689 }
1690
1691 // Print a short set of xml attributes to identify this nmethod. The
1692 // output should be embedded in some other element.
1693 void nmethod::log_identity(xmlStream* log) const {
1694 assert(log->inside_attrs_or_error(), "printing attributes");
1695 log->print(" compile_id='%d'", compile_id());
1696 const char* nm_kind = compile_kind();
1697 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1698 log->print(" compiler='%s'", compiler_name());
1699 if (TieredCompilation) {
1700 log->print(" compile_level='%d'", comp_level());
1701 }
1702 #if INCLUDE_JVMCI
1703 if (jvmci_nmethod_data() != nullptr) {
1704 const char* jvmci_name = jvmci_nmethod_data()->name();
1705 if (jvmci_name != nullptr) {
1706 log->print(" jvmci_mirror_name='");
1707 log->text("%s", jvmci_name);
1708 log->print("'");
1709 }
1710 }
1711 #endif
1712 }
1713
1714
1715 #define LOG_OFFSET(log, name) \
1716 if (p2i(name##_end()) - p2i(name##_begin())) \
1717 log->print(" " XSTR(name) "_offset='%zd'" , \
1718 p2i(name##_begin()) - p2i(this))
1719
1720
1721 void nmethod::log_new_nmethod() const {
1722 if (LogCompilation && xtty != nullptr) {
1723 ttyLocker ttyl;
1724 xtty->begin_elem("nmethod");
1725 log_identity(xtty);
1726 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1727 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1728
1729 LOG_OFFSET(xtty, relocation);
1730 LOG_OFFSET(xtty, consts);
1731 LOG_OFFSET(xtty, insts);
1732 LOG_OFFSET(xtty, stub);
1733 LOG_OFFSET(xtty, scopes_data);
1734 LOG_OFFSET(xtty, scopes_pcs);
1735 LOG_OFFSET(xtty, dependencies);
1736 LOG_OFFSET(xtty, handler_table);
1737 LOG_OFFSET(xtty, nul_chk_table);
1738 LOG_OFFSET(xtty, oops);
1739 LOG_OFFSET(xtty, metadata);
1740
1741 xtty->method(method());
1742 xtty->stamp();
1743 xtty->end_elem();
1744 }
1745 }
1746
1747 #undef LOG_OFFSET
1748
1749
1750 // Print out more verbose output usually for a newly created nmethod.
1751 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1752 if (st != nullptr) {
1753 ttyLocker ttyl;
1754 if (WizardMode) {
1755 CompileTask::print(st, this, msg, /*short_form:*/ true);
1756 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1757 } else {
1758 CompileTask::print(st, this, msg, /*short_form:*/ false);
1759 }
1760 }
1761 }
1762
1763 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1764 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1765 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1766 print_nmethod(printnmethods);
1767 }
1768 }
1769
1770 void nmethod::print_nmethod(bool printmethod) {
1771 ttyLocker ttyl; // keep the following output all in one block
1772 if (xtty != nullptr) {
1773 xtty->begin_head("print_nmethod");
1774 log_identity(xtty);
1775 xtty->stamp();
1776 xtty->end_head();
1777 }
1778 // Print the header part, then print the requested information.
1779 // This is both handled in decode2().
1780 if (printmethod) {
1781 ResourceMark m;
1782 if (is_compiled_by_c1()) {
1783 tty->cr();
1784 tty->print_cr("============================= C1-compiled nmethod ==============================");
1785 }
1786 if (is_compiled_by_jvmci()) {
1787 tty->cr();
1788 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1789 }
1790 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1791 decode2(tty);
1792 #if defined(SUPPORT_DATA_STRUCTS)
1793 if (AbstractDisassembler::show_structs()) {
1794 // Print the oops from the underlying CodeBlob as well.
1795 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1796 print_oops(tty);
1797 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1798 print_metadata(tty);
1799 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1800 print_pcs_on(tty);
1801 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1802 if (oop_maps() != nullptr) {
1803 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1804 oop_maps()->print_on(tty);
1805 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1806 }
1807 }
1808 #endif
1809 } else {
1810 print(); // print the header part only.
1811 }
1812
1813 #if defined(SUPPORT_DATA_STRUCTS)
1814 if (AbstractDisassembler::show_structs()) {
1815 methodHandle mh(Thread::current(), _method);
1816 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1817 print_scopes();
1818 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1819 }
1820 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1821 print_relocations_on(tty);
1822 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1823 }
1824 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1825 print_dependencies_on(tty);
1826 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1827 }
1828 if (printmethod || PrintExceptionHandlers) {
1829 print_handler_table();
1830 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1831 print_nul_chk_table();
1832 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1833 }
1834
1835 if (printmethod) {
1836 print_recorded_oops();
1837 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1838 print_recorded_metadata();
1839 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1840 }
1841 }
1842 #endif
1843
1844 if (xtty != nullptr) {
1845 xtty->tail("print_nmethod");
1846 }
1847 }
1848
1849
1850 // Promote one word from an assembly-time handle to a live embedded oop.
1851 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1852 if (handle == nullptr ||
1853 // As a special case, IC oops are initialized to 1 or -1.
1854 handle == (jobject) Universe::non_oop_word()) {
1855 *(void**)dest = handle;
1856 } else {
1857 *dest = JNIHandles::resolve_non_null(handle);
1858 }
1859 }
1860
1861 void nmethod::copy_values(GrowableArray<Handle>* array) {
1862 int length = array->length();
1863 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1864 oop* dest = oops_begin();
1865 for (int index = 0 ; index < length; index++) {
1866 dest[index] = array->at(index)();
1867 }
1868 }
1869
1870 // Have to have the same name because it's called by a template
1871 void nmethod::copy_values(GrowableArray<jobject>* array) {
1872 int length = array->length();
1873 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1874 oop* dest = oops_begin();
1875 for (int index = 0 ; index < length; index++) {
1876 initialize_immediate_oop(&dest[index], array->at(index));
1877 }
1878
1879 // Now we can fix up all the oops in the code. We need to do this
1880 // in the code because the assembler uses jobjects as placeholders.
1881 // The code and relocations have already been initialized by the
1882 // CodeBlob constructor, so it is valid even at this early point to
1883 // iterate over relocations and patch the code.
1884 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1885 }
1886
1887 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1888 int length = array->length();
1889 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1890 Metadata** dest = metadata_begin();
1891 for (int index = 0 ; index < length; index++) {
1892 dest[index] = array->at(index);
1893 }
1894 }
1895
1896 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1897 // re-patch all oop-bearing instructions, just in case some oops moved
1898 RelocIterator iter(this, begin, end);
1899 while (iter.next()) {
1900 if (iter.type() == relocInfo::oop_type) {
1901 oop_Relocation* reloc = iter.oop_reloc();
1902 if (initialize_immediates && reloc->oop_is_immediate()) {
1903 oop* dest = reloc->oop_addr();
1904 jobject obj = *reinterpret_cast<jobject*>(dest);
1905 initialize_immediate_oop(dest, obj);
1906 }
1907 // Refresh the oop-related bits of this instruction.
1908 reloc->fix_oop_relocation();
1909 } else if (iter.type() == relocInfo::metadata_type) {
1910 metadata_Relocation* reloc = iter.metadata_reloc();
1911 reloc->fix_metadata_relocation();
1912 }
1913 }
1914 }
1915
1916 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
1917 RelocIterator iter(this);
1918 while (iter.next()) {
1919 if (iter.type() == relocInfo::oop_type) {
1920 oop_Relocation* reloc = iter.oop_reloc();
1921 if (reloc->oop_is_immediate()) {
1922 oop dest = reloc->oop_value();
1923 Handle h(thread, dest);
1924 oop_list.append(h);
1925 }
1926 } else if (iter.type() == relocInfo::metadata_type) {
1927 metadata_Relocation* reloc = iter.metadata_reloc();
1928 if (reloc->metadata_is_immediate()) {
1929 Metadata* m = reloc->metadata_value();
1930 metadata_list.append(m);
1931 }
1932 }
1933 }
1934 }
1935
1936 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1937 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1938 intptr_t cbaddr = (intptr_t) nm;
1939 intptr_t offset = ((intptr_t) pc) - cbaddr;
1940
1941 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1942 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1943 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1944 } else if (!nop->patch(oopmap_slot, offset)) {
1945 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1946 }
1947 }
1948
1949 void nmethod::finalize_relocations() {
1950 NoSafepointVerifier nsv;
1951
1952 GrowableArray<NativeMovConstReg*> virtual_call_data;
1953
1954 // Make sure that post call nops fill in nmethod offsets eagerly so
1955 // we don't have to race with deoptimization
1956 RelocIterator iter(this);
1957 while (iter.next()) {
1958 if (iter.type() == relocInfo::virtual_call_type) {
1959 virtual_call_Relocation* r = iter.virtual_call_reloc();
1960 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1961 virtual_call_data.append(value);
1962 } else if (iter.type() == relocInfo::post_call_nop_type) {
1963 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1964 address pc = reloc->addr();
1965 install_post_call_nop_displacement(this, pc);
1966 }
1967 }
1968
1969 if (virtual_call_data.length() > 0) {
1970 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
1971 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
1972 CompiledICData* next_data = _compiled_ic_data;
1973
1974 for (NativeMovConstReg* value : virtual_call_data) {
1975 value->set_data((intptr_t)next_data);
1976 next_data++;
1977 }
1978 }
1979 }
1980
1981 void nmethod::make_deoptimized() {
1982 if (!Continuations::enabled()) {
1983 // Don't deopt this again.
1984 set_deoptimized_done();
1985 return;
1986 }
1987
1988 assert(method() == nullptr || can_be_deoptimized(), "");
1989
1990 CompiledICLocker ml(this);
1991 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1992
1993 // If post call nops have been already patched, we can just bail-out.
1994 if (has_been_deoptimized()) {
1995 return;
1996 }
1997
1998 ResourceMark rm;
1999 RelocIterator iter(this, oops_reloc_begin());
2000
2001 while (iter.next()) {
2002
2003 switch (iter.type()) {
2004 case relocInfo::virtual_call_type: {
2005 CompiledIC *ic = CompiledIC_at(&iter);
2006 address pc = ic->end_of_call();
2007 NativePostCallNop* nop = nativePostCallNop_at(pc);
2008 if (nop != nullptr) {
2009 nop->make_deopt();
2010 }
2011 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2012 break;
2013 }
2014 case relocInfo::static_call_type:
2015 case relocInfo::opt_virtual_call_type: {
2016 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2017 address pc = csc->end_of_call();
2018 NativePostCallNop* nop = nativePostCallNop_at(pc);
2019 //tty->print_cr(" - static pc %p", pc);
2020 if (nop != nullptr) {
2021 nop->make_deopt();
2022 }
2023 // We can't assert here, there are some calls to stubs / runtime
2024 // that have reloc data and doesn't have a post call NOP.
2025 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2026 break;
2027 }
2028 default:
2029 break;
2030 }
2031 }
2032 // Don't deopt this again.
2033 set_deoptimized_done();
2034 }
2035
2036 void nmethod::verify_clean_inline_caches() {
2037 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2038
2039 ResourceMark rm;
2040 RelocIterator iter(this, oops_reloc_begin());
2041 while(iter.next()) {
2042 switch(iter.type()) {
2043 case relocInfo::virtual_call_type: {
2044 CompiledIC *ic = CompiledIC_at(&iter);
2045 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2046 assert(cb != nullptr, "destination not in CodeBlob?");
2047 nmethod* nm = cb->as_nmethod_or_null();
2048 if (nm != nullptr) {
2049 // Verify that inline caches pointing to bad nmethods are clean
2050 if (!nm->is_in_use() || nm->is_unloading()) {
2051 assert(ic->is_clean(), "IC should be clean");
2052 }
2053 }
2054 break;
2055 }
2056 case relocInfo::static_call_type:
2057 case relocInfo::opt_virtual_call_type: {
2058 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2059 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2060 assert(cb != nullptr, "destination not in CodeBlob?");
2061 nmethod* nm = cb->as_nmethod_or_null();
2062 if (nm != nullptr) {
2063 // Verify that inline caches pointing to bad nmethods are clean
2064 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2065 assert(cdc->is_clean(), "IC should be clean");
2066 }
2067 }
2068 break;
2069 }
2070 default:
2071 break;
2072 }
2073 }
2074 }
2075
2076 void nmethod::mark_as_maybe_on_stack() {
2077 AtomicAccess::store(&_gc_epoch, CodeCache::gc_epoch());
2078 }
2079
2080 bool nmethod::is_maybe_on_stack() {
2081 // If the condition below is true, it means that the nmethod was found to
2082 // be alive the previous completed marking cycle.
2083 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2084 }
2085
2086 void nmethod::inc_decompile_count() {
2087 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2088 // Could be gated by ProfileTraps, but do not bother...
2089 #if INCLUDE_JVMCI
2090 if (jvmci_skip_profile_deopt()) {
2091 return;
2092 }
2093 #endif
2094 Method* m = method();
2095 if (m == nullptr) return;
2096 MethodData* mdo = m->method_data();
2097 if (mdo == nullptr) return;
2098 // There is a benign race here. See comments in methodData.hpp.
2099 mdo->inc_decompile_count();
2100 }
2101
2102 void nmethod::inc_method_profiling_count() {
2103 AtomicAccess::inc(&_method_profiling_count);
2104 }
2105
2106 uint64_t nmethod::method_profiling_count() {
2107 return _method_profiling_count;
2108 }
2109
2110 bool nmethod::try_transition(signed char new_state_int) {
2111 signed char new_state = new_state_int;
2112 assert_lock_strong(NMethodState_lock);
2113 signed char old_state = _state;
2114 if (old_state >= new_state) {
2115 // Ensure monotonicity of transitions.
2116 return false;
2117 }
2118 AtomicAccess::store(&_state, new_state);
2119 return true;
2120 }
2121
2122 void nmethod::invalidate_osr_method() {
2123 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2124 // Remove from list of active nmethods
2125 if (method() != nullptr) {
2126 method()->method_holder()->remove_osr_nmethod(this);
2127 }
2128 }
2129
2130 void nmethod::log_state_change(InvalidationReason invalidation_reason) const {
2131 if (LogCompilation) {
2132 if (xtty != nullptr) {
2133 ttyLocker ttyl; // keep the following output all in one block
2134 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2135 os::current_thread_id(), invalidation_reason_to_string(invalidation_reason));
2136 log_identity(xtty);
2137 xtty->stamp();
2138 xtty->end_elem();
2139 }
2140 }
2141
2142 ResourceMark rm;
2143 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2144 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2145
2146 CompileTask::print_ul(this, ss.freeze());
2147 if (PrintCompilation) {
2148 print_on_with_msg(tty, ss.freeze());
2149 }
2150 }
2151
2152 void nmethod::unlink_from_method() {
2153 if (method() != nullptr) {
2154 method()->unlink_code(this);
2155 }
2156 }
2157
2158 // Invalidate code
2159 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason, bool keep_aot_entry) {
2160 // This can be called while the system is already at a safepoint which is ok
2161 NoSafepointVerifier nsv;
2162
2163 if (is_unloading()) {
2164 // If the nmethod is unloading, then it is already not entrant through
2165 // the nmethod entry barriers. No need to do anything; GC will unload it.
2166 return false;
2167 }
2168
2169 if (AtomicAccess::load(&_state) == not_entrant) {
2170 // Avoid taking the lock if already in required state.
2171 // This is safe from races because the state is an end-state,
2172 // which the nmethod cannot back out of once entered.
2173 // No need for fencing either.
2174 return false;
2175 }
2176
2177 {
2178 // Enter critical section. Does not block for safepoint.
2179 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2180
2181 if (AtomicAccess::load(&_state) == not_entrant) {
2182 // another thread already performed this transition so nothing
2183 // to do, but return false to indicate this.
2184 return false;
2185 }
2186
2187 if (is_osr_method()) {
2188 // This logic is equivalent to the logic below for patching the
2189 // verified entry point of regular methods.
2190 // this effectively makes the osr nmethod not entrant
2191 invalidate_osr_method();
2192 } else {
2193 // The caller can be calling the method statically or through an inline
2194 // cache call.
2195 BarrierSet::barrier_set()->barrier_set_nmethod()->make_not_entrant(this);
2196 }
2197
2198 if (update_recompile_counts()) {
2199 // Mark the method as decompiled.
2200 inc_decompile_count();
2201 }
2202
2203 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2204 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2205 // If nmethod entry barriers are not supported, we won't mark
2206 // nmethods as on-stack when they become on-stack. So we
2207 // degrade to a less accurate flushing strategy, for now.
2208 mark_as_maybe_on_stack();
2209 }
2210
2211 // Change state
2212 bool success = try_transition(not_entrant);
2213 assert(success, "Transition can't fail");
2214
2215 // Log the transition once
2216 log_state_change(invalidation_reason);
2217
2218 // Remove nmethod from method.
2219 unlink_from_method();
2220
2221 if (!keep_aot_entry) {
2222 // Keep AOT code if it was simply replaced
2223 // otherwise make it not entrant too.
2224 AOTCodeCache::invalidate(_aot_code_entry);
2225 }
2226
2227 CompileBroker::log_not_entrant(this);
2228 } // leave critical region under NMethodState_lock
2229
2230 #if INCLUDE_JVMCI
2231 // Invalidate can't occur while holding the NMethodState_lock
2232 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2233 if (nmethod_data != nullptr) {
2234 nmethod_data->invalidate_nmethod_mirror(this, invalidation_reason);
2235 }
2236 #endif
2237
2238 #ifdef ASSERT
2239 if (is_osr_method() && method() != nullptr) {
2240 // Make sure osr nmethod is invalidated, i.e. not on the list
2241 bool found = method()->method_holder()->remove_osr_nmethod(this);
2242 assert(!found, "osr nmethod should have been invalidated");
2243 }
2244 #endif
2245
2246 return true;
2247 }
2248
2249 // For concurrent GCs, there must be a handshake between unlink and flush
2250 void nmethod::unlink() {
2251 if (is_unlinked()) {
2252 // Already unlinked.
2253 return;
2254 }
2255
2256 flush_dependencies();
2257
2258 // unlink_from_method will take the NMethodState_lock.
2259 // In this case we don't strictly need it when unlinking nmethods from
2260 // the Method, because it is only concurrently unlinked by
2261 // the entry barrier, which acquires the per nmethod lock.
2262 unlink_from_method();
2263
2264 if (is_osr_method()) {
2265 invalidate_osr_method();
2266 }
2267
2268 #if INCLUDE_JVMCI
2269 // Clear the link between this nmethod and a HotSpotNmethod mirror
2270 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2271 if (nmethod_data != nullptr) {
2272 nmethod_data->invalidate_nmethod_mirror(this, is_cold() ?
2273 nmethod::InvalidationReason::UNLOADING_COLD :
2274 nmethod::InvalidationReason::UNLOADING);
2275 }
2276 #endif
2277
2278 // Post before flushing as jmethodID is being used
2279 post_compiled_method_unload();
2280
2281 // Register for flushing when it is safe. For concurrent class unloading,
2282 // that would be after the unloading handshake, and for STW class unloading
2283 // that would be when getting back to the VM thread.
2284 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2285 }
2286
2287 void nmethod::purge(bool unregister_nmethod) {
2288
2289 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2290
2291 // completely deallocate this method
2292 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, compile_kind(), p2i(this));
2293
2294 LogTarget(Debug, codecache) lt;
2295 if (lt.is_enabled()) {
2296 ResourceMark rm;
2297 LogStream ls(lt);
2298 const char* method_name = method()->name()->as_C_string();
2299 const size_t codecache_capacity = CodeCache::capacity()/1024;
2300 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2301 ls.print("Flushing %s nmethod %6d/" INTPTR_FORMAT ", level=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2302 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2303 compile_kind(), _compile_id, p2i(this), _comp_level, is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2304 codecache_capacity, codecache_free_space, method_name, compiler_name());
2305 }
2306
2307 // We need to deallocate any ExceptionCache data.
2308 // Note that we do not need to grab the nmethod lock for this, it
2309 // better be thread safe if we're disposing of it!
2310 ExceptionCache* ec = exception_cache();
2311 while(ec != nullptr) {
2312 ExceptionCache* next = ec->next();
2313 delete ec;
2314 ec = next;
2315 }
2316 if (_pc_desc_container != nullptr) {
2317 delete _pc_desc_container;
2318 }
2319 if (_compiled_ic_data != nullptr) {
2320 delete[] _compiled_ic_data;
2321 }
2322
2323 if (_immutable_data != data_end() && !AOTCodeCache::is_address_in_aot_cache((address)_oop_maps)) {
2324 os::free(_immutable_data);
2325 _immutable_data = blob_end(); // Valid not null address
2326 }
2327 if (unregister_nmethod) {
2328 Universe::heap()->unregister_nmethod(this);
2329 }
2330 CodeCache::unregister_old_nmethod(this);
2331
2332 JVMCI_ONLY( _metadata_size = 0; )
2333 CodeBlob::purge();
2334 }
2335
2336 oop nmethod::oop_at(int index) const {
2337 if (index == 0) {
2338 return nullptr;
2339 }
2340
2341 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2342 return bs_nm->oop_load_no_keepalive(this, index);
2343 }
2344
2345 oop nmethod::oop_at_phantom(int index) const {
2346 if (index == 0) {
2347 return nullptr;
2348 }
2349
2350 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2351 return bs_nm->oop_load_phantom(this, index);
2352 }
2353
2354 //
2355 // Notify all classes this nmethod is dependent on that it is no
2356 // longer dependent.
2357
2358 void nmethod::flush_dependencies() {
2359 if (!has_flushed_dependencies()) {
2360 set_has_flushed_dependencies(true);
2361 for (Dependencies::DepStream deps(this); deps.next(); ) {
2362 if (deps.type() == Dependencies::call_site_target_value) {
2363 // CallSite dependencies are managed on per-CallSite instance basis.
2364 oop call_site = deps.argument_oop(0);
2365 MethodHandles::clean_dependency_context(call_site);
2366 } else {
2367 InstanceKlass* ik = deps.context_type();
2368 if (ik == nullptr) {
2369 continue; // ignore things like evol_method
2370 }
2371 // During GC liveness of dependee determines class that needs to be updated.
2372 // The GC may clean dependency contexts concurrently and in parallel.
2373 ik->clean_dependency_context();
2374 }
2375 }
2376 }
2377 }
2378
2379 void nmethod::post_compiled_method(CompileTask* task) {
2380 task->mark_success();
2381 task->set_nm_content_size(content_size());
2382 task->set_nm_insts_size(insts_size());
2383 task->set_nm_total_size(total_size());
2384
2385 // task->is_aot_load() is true only for loaded AOT code.
2386 // nmethod::_aot_code_entry is set for loaded and stored AOT code
2387 // to invalidate the entry when nmethod is deoptimized.
2388 // VerifyAOTCode is option to not store in archive AOT code.
2389 guarantee((_aot_code_entry != nullptr) || !task->is_aot_load() || VerifyAOTCode, "sanity");
2390
2391 // JVMTI -- compiled method notification (must be done outside lock)
2392 post_compiled_method_load_event();
2393
2394 if (CompilationLog::log() != nullptr) {
2395 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2396 }
2397
2398 const DirectiveSet* directive = task->directive();
2399 maybe_print_nmethod(directive);
2400 }
2401
2402 // ------------------------------------------------------------------
2403 // post_compiled_method_load_event
2404 // new method for install_code() path
2405 // Transfer information from compilation to jvmti
2406 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2407 // This is a bad time for a safepoint. We don't want
2408 // this nmethod to get unloaded while we're queueing the event.
2409 NoSafepointVerifier nsv;
2410
2411 Method* m = method();
2412 HOTSPOT_COMPILED_METHOD_LOAD(
2413 (char *) m->klass_name()->bytes(),
2414 m->klass_name()->utf8_length(),
2415 (char *) m->name()->bytes(),
2416 m->name()->utf8_length(),
2417 (char *) m->signature()->bytes(),
2418 m->signature()->utf8_length(),
2419 insts_begin(), insts_size());
2420
2421
2422 if (JvmtiExport::should_post_compiled_method_load()) {
2423 // Only post unload events if load events are found.
2424 set_load_reported();
2425 // If a JavaThread hasn't been passed in, let the Service thread
2426 // (which is a real Java thread) post the event
2427 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2428 if (state == nullptr) {
2429 // Execute any barrier code for this nmethod as if it's called, since
2430 // keeping it alive looks like stack walking.
2431 run_nmethod_entry_barrier();
2432 ServiceThread::enqueue_deferred_event(&event);
2433 } else {
2434 // This enters the nmethod barrier outside in the caller.
2435 state->enqueue_event(&event);
2436 }
2437 }
2438 }
2439
2440 void nmethod::post_compiled_method_unload() {
2441 assert(_method != nullptr, "just checking");
2442 DTRACE_METHOD_UNLOAD_PROBE(method());
2443
2444 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2445 // post the event. The Method* will not be valid when this is freed.
2446
2447 // Don't bother posting the unload if the load event wasn't posted.
2448 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2449 JvmtiDeferredEvent event =
2450 JvmtiDeferredEvent::compiled_method_unload_event(
2451 method()->jmethod_id(), insts_begin());
2452 ServiceThread::enqueue_deferred_event(&event);
2453 }
2454 }
2455
2456 // Iterate over metadata calling this function. Used by RedefineClasses
2457 void nmethod::metadata_do(MetadataClosure* f) {
2458 {
2459 // Visit all immediate references that are embedded in the instruction stream.
2460 RelocIterator iter(this, oops_reloc_begin());
2461 while (iter.next()) {
2462 if (iter.type() == relocInfo::metadata_type) {
2463 metadata_Relocation* r = iter.metadata_reloc();
2464 // In this metadata, we must only follow those metadatas directly embedded in
2465 // the code. Other metadatas (oop_index>0) are seen as part of
2466 // the metadata section below.
2467 assert(1 == (r->metadata_is_immediate()) +
2468 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2469 "metadata must be found in exactly one place");
2470 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2471 Metadata* md = r->metadata_value();
2472 if (md != _method) f->do_metadata(md);
2473 }
2474 } else if (iter.type() == relocInfo::virtual_call_type) {
2475 // Check compiledIC holders associated with this nmethod
2476 ResourceMark rm;
2477 CompiledIC *ic = CompiledIC_at(&iter);
2478 ic->metadata_do(f);
2479 }
2480 }
2481 }
2482
2483 // Visit the metadata section
2484 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2485 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2486 Metadata* md = *p;
2487 f->do_metadata(md);
2488 }
2489
2490 // Visit metadata not embedded in the other places.
2491 if (_method != nullptr) f->do_metadata(_method);
2492 }
2493
2494 // Heuristic for nuking nmethods even though their oops are live.
2495 // Main purpose is to reduce code cache pressure and get rid of
2496 // nmethods that don't seem to be all that relevant any longer.
2497 bool nmethod::is_cold() {
2498 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2499 // No heuristic unloading at all
2500 return false;
2501 }
2502
2503 if (!is_maybe_on_stack() && is_not_entrant()) {
2504 // Not entrant nmethods that are not on any stack can just
2505 // be removed
2506 return true;
2507 }
2508
2509 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2510 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2511 // On platforms that don't support nmethod entry barriers, we can't
2512 // trust the temporal aspect of the gc epochs. So we can't detect
2513 // cold nmethods on such platforms.
2514 return false;
2515 }
2516
2517 if (!UseCodeCacheFlushing) {
2518 // Bail out if we don't heuristically remove nmethods
2519 return false;
2520 }
2521
2522 // Other code can be phased out more gradually after N GCs
2523 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2524 }
2525
2526 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2527 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2528 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2529 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2530 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2531
2532 class IsUnloadingState: public AllStatic {
2533 static const uint8_t _is_unloading_mask = 1;
2534 static const uint8_t _is_unloading_shift = 0;
2535 static const uint8_t _unloading_cycle_mask = 6;
2536 static const uint8_t _unloading_cycle_shift = 1;
2537
2538 static uint8_t set_is_unloading(uint8_t state, bool value) {
2539 state &= (uint8_t)~_is_unloading_mask;
2540 if (value) {
2541 state |= 1 << _is_unloading_shift;
2542 }
2543 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2544 return state;
2545 }
2546
2547 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2548 state &= (uint8_t)~_unloading_cycle_mask;
2549 state |= (uint8_t)(value << _unloading_cycle_shift);
2550 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2551 return state;
2552 }
2553
2554 public:
2555 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2556 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2557
2558 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2559 uint8_t state = 0;
2560 state = set_is_unloading(state, is_unloading);
2561 state = set_unloading_cycle(state, unloading_cycle);
2562 return state;
2563 }
2564 };
2565
2566 bool nmethod::is_unloading() {
2567 uint8_t state = AtomicAccess::load(&_is_unloading_state);
2568 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2569 if (state_is_unloading) {
2570 return true;
2571 }
2572 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2573 uint8_t current_cycle = CodeCache::unloading_cycle();
2574 if (state_unloading_cycle == current_cycle) {
2575 return false;
2576 }
2577
2578 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2579 // should be unloaded. This can be either because there is a dead oop,
2580 // or because is_cold() heuristically determines it is time to unload.
2581 state_unloading_cycle = current_cycle;
2582 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2583 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2584
2585 // Note that if an nmethod has dead oops, everyone will agree that the
2586 // nmethod is_unloading. However, the is_cold heuristics can yield
2587 // different outcomes, so we guard the computed result with a CAS
2588 // to ensure all threads have a shared view of whether an nmethod
2589 // is_unloading or not.
2590 uint8_t found_state = AtomicAccess::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2591
2592 if (found_state == state) {
2593 // First to change state, we win
2594 return state_is_unloading;
2595 } else {
2596 // State already set, so use it
2597 return IsUnloadingState::is_unloading(found_state);
2598 }
2599 }
2600
2601 void nmethod::clear_unloading_state() {
2602 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2603 AtomicAccess::store(&_is_unloading_state, state);
2604 }
2605
2606
2607 // This is called at the end of the strong tracing/marking phase of a
2608 // GC to unload an nmethod if it contains otherwise unreachable
2609 // oops or is heuristically found to be not important.
2610 void nmethod::do_unloading(bool unloading_occurred) {
2611 // Make sure the oop's ready to receive visitors
2612 if (is_unloading()) {
2613 unlink();
2614 } else {
2615 unload_nmethod_caches(unloading_occurred);
2616 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2617 if (bs_nm != nullptr) {
2618 bs_nm->disarm(this);
2619 }
2620 }
2621 }
2622
2623 void nmethod::oops_do(OopClosure* f) {
2624 // Prevent extra code cache walk for platforms that don't have immediate oops.
2625 if (relocInfo::mustIterateImmediateOopsInCode()) {
2626 RelocIterator iter(this, oops_reloc_begin());
2627
2628 while (iter.next()) {
2629 if (iter.type() == relocInfo::oop_type ) {
2630 oop_Relocation* r = iter.oop_reloc();
2631 // In this loop, we must only follow those oops directly embedded in
2632 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2633 assert(1 == (r->oop_is_immediate()) +
2634 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2635 "oop must be found in exactly one place");
2636 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2637 f->do_oop(r->oop_addr());
2638 }
2639 }
2640 }
2641 }
2642
2643 // Scopes
2644 // This includes oop constants not inlined in the code stream.
2645 for (oop* p = oops_begin(); p < oops_end(); p++) {
2646 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2647 f->do_oop(p);
2648 }
2649 }
2650
2651 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2652 // Process oops in the nmethod
2653 oops_do(cl);
2654
2655 // CodeCache unloading support
2656 mark_as_maybe_on_stack();
2657
2658 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2659 bs_nm->disarm(this);
2660
2661 // There's an assumption made that this function is not used by GCs that
2662 // relocate objects, and therefore we don't call fix_oop_relocations.
2663 }
2664
2665 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2666
2667 void nmethod::oops_do_log_change(const char* state) {
2668 LogTarget(Trace, gc, nmethod) lt;
2669 if (lt.is_enabled()) {
2670 LogStream ls(lt);
2671 CompileTask::print(&ls, this, state, true /* short_form */);
2672 }
2673 }
2674
2675 bool nmethod::oops_do_try_claim() {
2676 if (oops_do_try_claim_weak_request()) {
2677 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2678 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2679 return true;
2680 }
2681 return false;
2682 }
2683
2684 bool nmethod::oops_do_try_claim_weak_request() {
2685 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2686
2687 if ((_oops_do_mark_link == nullptr) &&
2688 (AtomicAccess::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2689 oops_do_log_change("oops_do, mark weak request");
2690 return true;
2691 }
2692 return false;
2693 }
2694
2695 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2696 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2697 }
2698
2699 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2700 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2701
2702 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2703 if (old_next == nullptr) {
2704 oops_do_log_change("oops_do, mark strong done");
2705 }
2706 return old_next;
2707 }
2708
2709 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2710 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2711 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2712
2713 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2714 if (old_next == next) {
2715 oops_do_log_change("oops_do, mark strong request");
2716 }
2717 return old_next;
2718 }
2719
2720 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2721 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2722 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2723
2724 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2725 if (old_next == next) {
2726 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2727 return true;
2728 }
2729 return false;
2730 }
2731
2732 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2733 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2734
2735 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2736 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2737 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2738
2739 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2740 // Self-loop if needed.
2741 if (old_head == nullptr) {
2742 old_head = this;
2743 }
2744 // Try to install end of list and weak done tag.
2745 if (AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
2746 oops_do_log_change("oops_do, mark weak done");
2747 return nullptr;
2748 } else {
2749 return old_head;
2750 }
2751 }
2752
2753 void nmethod::oops_do_add_to_list_as_strong_done() {
2754 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2755
2756 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2757 // Self-loop if needed.
2758 if (old_head == nullptr) {
2759 old_head = this;
2760 }
2761 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2762 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2763
2764 oops_do_set_strong_done(old_head);
2765 }
2766
2767 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2768 if (!oops_do_try_claim_weak_request()) {
2769 // Failed to claim for weak processing.
2770 oops_do_log_change("oops_do, mark weak request fail");
2771 return;
2772 }
2773
2774 p->do_regular_processing(this);
2775
2776 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2777 if (old_head == nullptr) {
2778 return;
2779 }
2780 oops_do_log_change("oops_do, mark weak done fail");
2781 // Adding to global list failed, another thread added a strong request.
2782 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2783 "must be but is %u", extract_state(_oops_do_mark_link));
2784
2785 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2786
2787 oops_do_set_strong_done(old_head);
2788 // Do missing strong processing.
2789 p->do_remaining_strong_processing(this);
2790 }
2791
2792 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2793 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2794 if (next_raw == nullptr) {
2795 p->do_regular_processing(this);
2796 oops_do_add_to_list_as_strong_done();
2797 return;
2798 }
2799 // Claim failed. Figure out why and handle it.
2800 if (oops_do_has_weak_request(next_raw)) {
2801 oops_do_mark_link* old = next_raw;
2802 // Claim failed because being weak processed (state == "weak request").
2803 // Try to request deferred strong processing.
2804 next_raw = oops_do_try_add_strong_request(old);
2805 if (next_raw == old) {
2806 // Successfully requested deferred strong processing.
2807 return;
2808 }
2809 // Failed because of a concurrent transition. No longer in "weak request" state.
2810 }
2811 if (oops_do_has_any_strong_state(next_raw)) {
2812 // Already claimed for strong processing or requested for such.
2813 return;
2814 }
2815 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2816 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2817 p->do_remaining_strong_processing(this);
2818 return;
2819 }
2820 // Claim failed, some other thread got it.
2821 }
2822
2823 void nmethod::oops_do_marking_prologue() {
2824 assert_at_safepoint();
2825
2826 log_trace(gc, nmethod)("oops_do_marking_prologue");
2827 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2828 }
2829
2830 void nmethod::oops_do_marking_epilogue() {
2831 assert_at_safepoint();
2832
2833 nmethod* next = _oops_do_mark_nmethods;
2834 _oops_do_mark_nmethods = nullptr;
2835 if (next != nullptr) {
2836 nmethod* cur;
2837 do {
2838 cur = next;
2839 next = extract_nmethod(cur->_oops_do_mark_link);
2840 cur->_oops_do_mark_link = nullptr;
2841 DEBUG_ONLY(cur->verify_oop_relocations());
2842
2843 LogTarget(Trace, gc, nmethod) lt;
2844 if (lt.is_enabled()) {
2845 LogStream ls(lt);
2846 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2847 }
2848 // End if self-loop has been detected.
2849 } while (cur != next);
2850 }
2851 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2852 }
2853
2854 inline bool includes(void* p, void* from, void* to) {
2855 return from <= p && p < to;
2856 }
2857
2858
2859 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2860 assert(count >= 2, "must be sentinel values, at least");
2861
2862 #ifdef ASSERT
2863 // must be sorted and unique; we do a binary search in find_pc_desc()
2864 int prev_offset = pcs[0].pc_offset();
2865 assert(prev_offset == PcDesc::lower_offset_limit,
2866 "must start with a sentinel");
2867 for (int i = 1; i < count; i++) {
2868 int this_offset = pcs[i].pc_offset();
2869 assert(this_offset > prev_offset, "offsets must be sorted");
2870 prev_offset = this_offset;
2871 }
2872 assert(prev_offset == PcDesc::upper_offset_limit,
2873 "must end with a sentinel");
2874 #endif //ASSERT
2875
2876 // Search for MethodHandle invokes and tag the nmethod.
2877 for (int i = 0; i < count; i++) {
2878 if (pcs[i].is_method_handle_invoke()) {
2879 set_has_method_handle_invokes(true);
2880 break;
2881 }
2882 }
2883 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler");
2884
2885 int size = count * sizeof(PcDesc);
2886 assert(scopes_pcs_size() >= size, "oob");
2887 memcpy(scopes_pcs_begin(), pcs, size);
2888
2889 // Adjust the final sentinel downward.
2890 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2891 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2892 last_pc->set_pc_offset(content_size() + 1);
2893 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2894 // Fill any rounding gaps with copies of the last record.
2895 last_pc[1] = last_pc[0];
2896 }
2897 // The following assert could fail if sizeof(PcDesc) is not
2898 // an integral multiple of oopSize (the rounding term).
2899 // If it fails, change the logic to always allocate a multiple
2900 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2901 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2902 }
2903
2904 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2905 assert(scopes_data_size() >= size, "oob");
2906 memcpy(scopes_data_begin(), buffer, size);
2907 }
2908
2909 #ifdef ASSERT
2910 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2911 PcDesc* res = nullptr;
2912 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2913 "must start with a sentinel");
2914 // lower + 1 to exclude initial sentinel
2915 for (PcDesc* p = lower + 1; p < upper; p++) {
2916 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2917 if (match_desc(p, pc_offset, approximate)) {
2918 if (res == nullptr) {
2919 res = p;
2920 } else {
2921 res = (PcDesc*) badAddress;
2922 }
2923 }
2924 }
2925 return res;
2926 }
2927 #endif
2928
2929
2930 #ifndef PRODUCT
2931 // Version of method to collect statistic
2932 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2933 PcDesc* lower, PcDesc* upper) {
2934 ++pc_nmethod_stats.pc_desc_queries;
2935 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2936
2937 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2938 assert(desc != nullptr, "PcDesc cache should be initialized already");
2939 if (desc->pc_offset() == (pc - code_begin)) {
2940 // Cached value matched
2941 ++pc_nmethod_stats.pc_desc_tests;
2942 ++pc_nmethod_stats.pc_desc_repeats;
2943 return desc;
2944 }
2945 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2946 }
2947 #endif
2948
2949 // Finds a PcDesc with real-pc equal to "pc"
2950 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2951 PcDesc* lower_incl, PcDesc* upper_incl) {
2952 if ((pc < code_begin) ||
2953 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2954 return nullptr; // PC is wildly out of range
2955 }
2956 int pc_offset = (int) (pc - code_begin);
2957
2958 // Check the PcDesc cache if it contains the desired PcDesc
2959 // (This as an almost 100% hit rate.)
2960 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2961 if (res != nullptr) {
2962 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2963 return res;
2964 }
2965
2966 // Fallback algorithm: quasi-linear search for the PcDesc
2967 // Find the last pc_offset less than the given offset.
2968 // The successor must be the required match, if there is a match at all.
2969 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2970 PcDesc* lower = lower_incl; // this is initial sentinel
2971 PcDesc* upper = upper_incl - 1; // exclude final sentinel
2972 if (lower >= upper) return nullptr; // no PcDescs at all
2973
2974 #define assert_LU_OK \
2975 /* invariant on lower..upper during the following search: */ \
2976 assert(lower->pc_offset() < pc_offset, "sanity"); \
2977 assert(upper->pc_offset() >= pc_offset, "sanity")
2978 assert_LU_OK;
2979
2980 // Use the last successful return as a split point.
2981 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2982 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2983 if (mid->pc_offset() < pc_offset) {
2984 lower = mid;
2985 } else {
2986 upper = mid;
2987 }
2988
2989 // Take giant steps at first (4096, then 256, then 16, then 1)
2990 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
2991 const int RADIX = (1 << LOG2_RADIX);
2992 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
2993 while ((mid = lower + step) < upper) {
2994 assert_LU_OK;
2995 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2996 if (mid->pc_offset() < pc_offset) {
2997 lower = mid;
2998 } else {
2999 upper = mid;
3000 break;
3001 }
3002 }
3003 assert_LU_OK;
3004 }
3005
3006 // Sneak up on the value with a linear search of length ~16.
3007 while (true) {
3008 assert_LU_OK;
3009 mid = lower + 1;
3010 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3011 if (mid->pc_offset() < pc_offset) {
3012 lower = mid;
3013 } else {
3014 upper = mid;
3015 break;
3016 }
3017 }
3018 #undef assert_LU_OK
3019
3020 if (match_desc(upper, pc_offset, approximate)) {
3021 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3022 if (!Thread::current_in_asgct()) {
3023 // we don't want to modify the cache if we're in ASGCT
3024 // which is typically called in a signal handler
3025 _pc_desc_cache.add_pc_desc(upper);
3026 }
3027 return upper;
3028 } else {
3029 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3030 return nullptr;
3031 }
3032 }
3033
3034 bool nmethod::check_dependency_on(DepChange& changes) {
3035 // What has happened:
3036 // 1) a new class dependee has been added
3037 // 2) dependee and all its super classes have been marked
3038 bool found_check = false; // set true if we are upset
3039 for (Dependencies::DepStream deps(this); deps.next(); ) {
3040 // Evaluate only relevant dependencies.
3041 if (deps.spot_check_dependency_at(changes) != nullptr) {
3042 found_check = true;
3043 NOT_DEBUG(break);
3044 }
3045 }
3046 return found_check;
3047 }
3048
3049 // Called from mark_for_deoptimization, when dependee is invalidated.
3050 bool nmethod::is_dependent_on_method(Method* dependee) {
3051 for (Dependencies::DepStream deps(this); deps.next(); ) {
3052 if (deps.type() != Dependencies::evol_method)
3053 continue;
3054 Method* method = deps.method_argument(0);
3055 if (method == dependee) return true;
3056 }
3057 return false;
3058 }
3059
3060 void nmethod_init() {
3061 // make sure you didn't forget to adjust the filler fields
3062 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3063 }
3064
3065 // -----------------------------------------------------------------------------
3066 // Verification
3067
3068 class VerifyOopsClosure: public OopClosure {
3069 nmethod* _nm;
3070 bool _ok;
3071 public:
3072 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3073 bool ok() { return _ok; }
3074 virtual void do_oop(oop* p) {
3075 if (oopDesc::is_oop_or_null(*p)) return;
3076 // Print diagnostic information before calling print_nmethod().
3077 // Assertions therein might prevent call from returning.
3078 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3079 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3080 if (_ok) {
3081 _nm->print_nmethod(true);
3082 _ok = false;
3083 }
3084 }
3085 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3086 };
3087
3088 class VerifyMetadataClosure: public MetadataClosure {
3089 public:
3090 void do_metadata(Metadata* md) {
3091 if (md->is_method()) {
3092 Method* method = (Method*)md;
3093 assert(!method->is_old(), "Should not be installing old methods");
3094 }
3095 }
3096 };
3097
3098
3099 void nmethod::verify() {
3100 if (is_not_entrant())
3101 return;
3102
3103 // assert(oopDesc::is_oop(method()), "must be valid");
3104
3105 ResourceMark rm;
3106
3107 if (!CodeCache::contains(this)) {
3108 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3109 }
3110
3111 if(is_native_method() )
3112 return;
3113
3114 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3115 if (nm != this) {
3116 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3117 }
3118
3119 // Verification can triggered during shutdown after AOTCodeCache is closed.
3120 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3121 if (!is_aot() || AOTCodeCache::is_on()) {
3122 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3123 if (! p->verify(this)) {
3124 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3125 }
3126 }
3127
3128 #ifdef ASSERT
3129 #if INCLUDE_JVMCI
3130 {
3131 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3132 ImmutableOopMapSet* oms = oop_maps();
3133 ImplicitExceptionTable implicit_table(this);
3134 for (uint i = 0; i < implicit_table.len(); i++) {
3135 int exec_offset = (int) implicit_table.get_exec_offset(i);
3136 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3137 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3138 bool found = false;
3139 for (int i = 0, imax = oms->count(); i < imax; i++) {
3140 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3141 found = true;
3142 break;
3143 }
3144 }
3145 assert(found, "missing oopmap");
3146 }
3147 }
3148 }
3149 #endif
3150 #endif
3151 }
3152
3153 VerifyOopsClosure voc(this);
3154 oops_do(&voc);
3155 assert(voc.ok(), "embedded oops must be OK");
3156 Universe::heap()->verify_nmethod(this);
3157
3158 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3159 nm->method()->external_name(), p2i(_oops_do_mark_link));
3160 if (!is_aot() || AOTCodeCache::is_on()) {
3161 verify_scopes();
3162 }
3163
3164 CompiledICLocker nm_verify(this);
3165 VerifyMetadataClosure vmc;
3166 metadata_do(&vmc);
3167 }
3168
3169
3170 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3171
3172 // Verify IC only when nmethod installation is finished.
3173 if (!is_not_installed()) {
3174 if (CompiledICLocker::is_safe(this)) {
3175 if (is_inline_cache) {
3176 CompiledIC_at(this, call_site);
3177 } else {
3178 CompiledDirectCall::at(call_site);
3179 }
3180 } else {
3181 CompiledICLocker ml_verify(this);
3182 if (is_inline_cache) {
3183 CompiledIC_at(this, call_site);
3184 } else {
3185 CompiledDirectCall::at(call_site);
3186 }
3187 }
3188 }
3189
3190 HandleMark hm(Thread::current());
3191
3192 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3193 assert(pd != nullptr, "PcDesc must exist");
3194 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3195 !sd->is_top(); sd = sd->sender()) {
3196 sd->verify();
3197 }
3198 }
3199
3200 void nmethod::verify_scopes() {
3201 if( !method() ) return; // Runtime stubs have no scope
3202 if (method()->is_native()) return; // Ignore stub methods.
3203 // iterate through all interrupt point
3204 // and verify the debug information is valid.
3205 RelocIterator iter(this);
3206 while (iter.next()) {
3207 address stub = nullptr;
3208 switch (iter.type()) {
3209 case relocInfo::virtual_call_type:
3210 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3211 break;
3212 case relocInfo::opt_virtual_call_type:
3213 stub = iter.opt_virtual_call_reloc()->static_stub();
3214 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3215 break;
3216 case relocInfo::static_call_type:
3217 stub = iter.static_call_reloc()->static_stub();
3218 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3219 break;
3220 case relocInfo::runtime_call_type:
3221 case relocInfo::runtime_call_w_cp_type: {
3222 address destination = iter.reloc()->value();
3223 // Right now there is no way to find out which entries support
3224 // an interrupt point. It would be nice if we had this
3225 // information in a table.
3226 break;
3227 }
3228 default:
3229 break;
3230 }
3231 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3232 }
3233 }
3234
3235
3236 // -----------------------------------------------------------------------------
3237 // Printing operations
3238
3239 void nmethod::print_on_impl(outputStream* st) const {
3240 ResourceMark rm;
3241
3242 st->print("Compiled method ");
3243
3244 if (is_compiled_by_c1()) {
3245 st->print("(c1) ");
3246 } else if (is_compiled_by_c2()) {
3247 st->print("(c2) ");
3248 } else if (is_compiled_by_jvmci()) {
3249 st->print("(JVMCI) ");
3250 } else {
3251 st->print("(n/a) ");
3252 }
3253
3254 print_on_with_msg(st, nullptr);
3255
3256 if (WizardMode) {
3257 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3258 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3259 st->print(" { ");
3260 st->print_cr("%s ", state());
3261 st->print_cr("}:");
3262 }
3263 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3264 p2i(this),
3265 p2i(this) + size(),
3266 size());
3267 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3268 p2i(consts_begin()),
3269 p2i(consts_end()),
3270 consts_size());
3271 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3272 p2i(insts_begin()),
3273 p2i(insts_end()),
3274 insts_size());
3275 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3276 p2i(stub_begin()),
3277 p2i(stub_end()),
3278 stub_size());
3279 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3280 p2i(oops_begin()),
3281 p2i(oops_end()),
3282 oops_size());
3283 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3284 p2i(mutable_data_begin()),
3285 p2i(mutable_data_end()),
3286 mutable_data_size());
3287 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3288 p2i(relocation_begin()),
3289 p2i(relocation_end()),
3290 relocation_size());
3291 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3292 p2i(metadata_begin()),
3293 p2i(metadata_end()),
3294 metadata_size());
3295 #if INCLUDE_JVMCI
3296 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3297 p2i(jvmci_data_begin()),
3298 p2i(jvmci_data_end()),
3299 jvmci_data_size());
3300 #endif
3301 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3302 p2i(immutable_data_begin()),
3303 p2i(immutable_data_end()),
3304 immutable_data_size());
3305 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3306 p2i(dependencies_begin()),
3307 p2i(dependencies_end()),
3308 dependencies_size());
3309 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3310 p2i(nul_chk_table_begin()),
3311 p2i(nul_chk_table_end()),
3312 nul_chk_table_size());
3313 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3314 p2i(handler_table_begin()),
3315 p2i(handler_table_end()),
3316 handler_table_size());
3317 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3318 p2i(scopes_pcs_begin()),
3319 p2i(scopes_pcs_end()),
3320 scopes_pcs_size());
3321 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3322 p2i(scopes_data_begin()),
3323 p2i(scopes_data_end()),
3324 scopes_data_size());
3325 #if INCLUDE_JVMCI
3326 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3327 p2i(speculations_begin()),
3328 p2i(speculations_end()),
3329 speculations_size());
3330 #endif
3331 if (AOTCodeCache::is_on() && _aot_code_entry != nullptr) {
3332 _aot_code_entry->print(st);
3333 }
3334 }
3335
3336 void nmethod::print_code() {
3337 ResourceMark m;
3338 ttyLocker ttyl;
3339 // Call the specialized decode method of this class.
3340 decode(tty);
3341 }
3342
3343 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3344
3345 void nmethod::print_dependencies_on(outputStream* out) {
3346 ResourceMark rm;
3347 stringStream st;
3348 st.print_cr("Dependencies:");
3349 for (Dependencies::DepStream deps(this); deps.next(); ) {
3350 deps.print_dependency(&st);
3351 InstanceKlass* ctxk = deps.context_type();
3352 if (ctxk != nullptr) {
3353 if (ctxk->is_dependent_nmethod(this)) {
3354 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3355 }
3356 }
3357 deps.log_dependency(); // put it into the xml log also
3358 }
3359 out->print_raw(st.as_string());
3360 }
3361 #endif
3362
3363 #if defined(SUPPORT_DATA_STRUCTS)
3364
3365 // Print the oops from the underlying CodeBlob.
3366 void nmethod::print_oops(outputStream* st) {
3367 ResourceMark m;
3368 st->print("Oops:");
3369 if (oops_begin() < oops_end()) {
3370 st->cr();
3371 for (oop* p = oops_begin(); p < oops_end(); p++) {
3372 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3373 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3374 if (Universe::contains_non_oop_word(p)) {
3375 st->print_cr("NON_OOP");
3376 continue; // skip non-oops
3377 }
3378 if (*p == nullptr) {
3379 st->print_cr("nullptr-oop");
3380 continue; // skip non-oops
3381 }
3382 (*p)->print_value_on(st);
3383 st->cr();
3384 }
3385 } else {
3386 st->print_cr(" <list empty>");
3387 }
3388 }
3389
3390 // Print metadata pool.
3391 void nmethod::print_metadata(outputStream* st) {
3392 ResourceMark m;
3393 st->print("Metadata:");
3394 if (metadata_begin() < metadata_end()) {
3395 st->cr();
3396 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3397 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3398 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3399 if (*p && *p != Universe::non_oop_word()) {
3400 (*p)->print_value_on(st);
3401 }
3402 st->cr();
3403 }
3404 } else {
3405 st->print_cr(" <list empty>");
3406 }
3407 }
3408
3409 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3410 void nmethod::print_scopes_on(outputStream* st) {
3411 // Find the first pc desc for all scopes in the code and print it.
3412 ResourceMark rm;
3413 st->print("scopes:");
3414 if (scopes_pcs_begin() < scopes_pcs_end()) {
3415 st->cr();
3416 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3417 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3418 continue;
3419
3420 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3421 while (sd != nullptr) {
3422 sd->print_on(st, p); // print output ends with a newline
3423 sd = sd->sender();
3424 }
3425 }
3426 } else {
3427 st->print_cr(" <list empty>");
3428 }
3429 }
3430 #endif
3431
3432 #ifndef PRODUCT // RelocIterator does support printing only then.
3433 void nmethod::print_relocations_on(outputStream* st) {
3434 ResourceMark m; // in case methods get printed via the debugger
3435 st->print_cr("relocations:");
3436 RelocIterator iter(this);
3437 iter.print_on(st);
3438 }
3439 #endif
3440
3441 void nmethod::print_pcs_on(outputStream* st) {
3442 ResourceMark m; // in case methods get printed via debugger
3443 st->print("pc-bytecode offsets:");
3444 if (scopes_pcs_begin() < scopes_pcs_end()) {
3445 st->cr();
3446 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3447 p->print_on(st, this); // print output ends with a newline
3448 }
3449 } else {
3450 st->print_cr(" <list empty>");
3451 }
3452 }
3453
3454 void nmethod::print_handler_table() {
3455 ExceptionHandlerTable(this).print(code_begin());
3456 }
3457
3458 void nmethod::print_nul_chk_table() {
3459 ImplicitExceptionTable(this).print(code_begin());
3460 }
3461
3462 void nmethod::print_recorded_oop(int log_n, int i) {
3463 void* value;
3464
3465 if (i == 0) {
3466 value = nullptr;
3467 } else {
3468 // Be careful around non-oop words. Don't create an oop
3469 // with that value, or it will assert in verification code.
3470 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3471 value = Universe::non_oop_word();
3472 } else {
3473 value = oop_at(i);
3474 }
3475 }
3476
3477 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3478
3479 if (value == Universe::non_oop_word()) {
3480 tty->print("non-oop word");
3481 } else {
3482 if (value == nullptr) {
3483 tty->print("nullptr-oop");
3484 } else {
3485 oop_at(i)->print_value_on(tty);
3486 }
3487 }
3488
3489 tty->cr();
3490 }
3491
3492 void nmethod::print_recorded_oops() {
3493 const int n = oops_count();
3494 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3495 tty->print("Recorded oops:");
3496 if (n > 0) {
3497 tty->cr();
3498 for (int i = 0; i < n; i++) {
3499 print_recorded_oop(log_n, i);
3500 }
3501 } else {
3502 tty->print_cr(" <list empty>");
3503 }
3504 }
3505
3506 void nmethod::print_recorded_metadata() {
3507 const int n = metadata_count();
3508 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3509 tty->print("Recorded metadata:");
3510 if (n > 0) {
3511 tty->cr();
3512 for (int i = 0; i < n; i++) {
3513 Metadata* m = metadata_at(i);
3514 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3515 if (m == (Metadata*)Universe::non_oop_word()) {
3516 tty->print("non-metadata word");
3517 } else if (m == nullptr) {
3518 tty->print("nullptr-oop");
3519 } else {
3520 Metadata::print_value_on_maybe_null(tty, m);
3521 }
3522 tty->cr();
3523 }
3524 } else {
3525 tty->print_cr(" <list empty>");
3526 }
3527 }
3528 #endif
3529
3530 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3531
3532 void nmethod::print_constant_pool(outputStream* st) {
3533 //-----------------------------------
3534 //---< Print the constant pool >---
3535 //-----------------------------------
3536 int consts_size = this->consts_size();
3537 if ( consts_size > 0 ) {
3538 unsigned char* cstart = this->consts_begin();
3539 unsigned char* cp = cstart;
3540 unsigned char* cend = cp + consts_size;
3541 unsigned int bytes_per_line = 4;
3542 unsigned int CP_alignment = 8;
3543 unsigned int n;
3544
3545 st->cr();
3546
3547 //---< print CP header to make clear what's printed >---
3548 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3549 n = bytes_per_line;
3550 st->print_cr("[Constant Pool]");
3551 Disassembler::print_location(cp, cstart, cend, st, true, true);
3552 Disassembler::print_hexdata(cp, n, st, true);
3553 st->cr();
3554 } else {
3555 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3556 st->print_cr("[Constant Pool (unaligned)]");
3557 }
3558
3559 //---< print CP contents, bytes_per_line at a time >---
3560 while (cp < cend) {
3561 Disassembler::print_location(cp, cstart, cend, st, true, false);
3562 Disassembler::print_hexdata(cp, n, st, false);
3563 cp += n;
3564 n = bytes_per_line;
3565 st->cr();
3566 }
3567
3568 //---< Show potential alignment gap between constant pool and code >---
3569 cend = code_begin();
3570 if( cp < cend ) {
3571 n = 4;
3572 st->print_cr("[Code entry alignment]");
3573 while (cp < cend) {
3574 Disassembler::print_location(cp, cstart, cend, st, false, false);
3575 cp += n;
3576 st->cr();
3577 }
3578 }
3579 } else {
3580 st->print_cr("[Constant Pool (empty)]");
3581 }
3582 st->cr();
3583 }
3584
3585 #endif
3586
3587 // Disassemble this nmethod.
3588 // Print additional debug information, if requested. This could be code
3589 // comments, block comments, profiling counters, etc.
3590 // The undisassembled format is useful no disassembler library is available.
3591 // The resulting hex dump (with markers) can be disassembled later, or on
3592 // another system, when/where a disassembler library is available.
3593 void nmethod::decode2(outputStream* ost) const {
3594
3595 // Called from frame::back_trace_with_decode without ResourceMark.
3596 ResourceMark rm;
3597
3598 // Make sure we have a valid stream to print on.
3599 outputStream* st = ost ? ost : tty;
3600
3601 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3602 const bool use_compressed_format = true;
3603 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3604 AbstractDisassembler::show_block_comment());
3605 #else
3606 const bool use_compressed_format = Disassembler::is_abstract();
3607 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3608 AbstractDisassembler::show_block_comment());
3609 #endif
3610
3611 st->cr();
3612 this->print_on(st);
3613 st->cr();
3614
3615 #if defined(SUPPORT_ASSEMBLY)
3616 //----------------------------------
3617 //---< Print real disassembly >---
3618 //----------------------------------
3619 if (! use_compressed_format) {
3620 st->print_cr("[Disassembly]");
3621 Disassembler::decode(const_cast<nmethod*>(this), st);
3622 st->bol();
3623 st->print_cr("[/Disassembly]");
3624 return;
3625 }
3626 #endif
3627
3628 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3629
3630 // Compressed undisassembled disassembly format.
3631 // The following status values are defined/supported:
3632 // = 0 - currently at bol() position, nothing printed yet on current line.
3633 // = 1 - currently at position after print_location().
3634 // > 1 - in the midst of printing instruction stream bytes.
3635 int compressed_format_idx = 0;
3636 int code_comment_column = 0;
3637 const int instr_maxlen = Assembler::instr_maxlen();
3638 const uint tabspacing = 8;
3639 unsigned char* start = this->code_begin();
3640 unsigned char* p = this->code_begin();
3641 unsigned char* end = this->code_end();
3642 unsigned char* pss = p; // start of a code section (used for offsets)
3643
3644 if ((start == nullptr) || (end == nullptr)) {
3645 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3646 return;
3647 }
3648 #endif
3649
3650 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3651 //---< plain abstract disassembly, no comments or anything, just section headers >---
3652 if (use_compressed_format && ! compressed_with_comments) {
3653 const_cast<nmethod*>(this)->print_constant_pool(st);
3654
3655 st->bol();
3656 st->cr();
3657 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3658 //---< Open the output (Marker for post-mortem disassembler) >---
3659 st->print_cr("[MachCode]");
3660 const char* header = nullptr;
3661 address p0 = p;
3662 while (p < end) {
3663 address pp = p;
3664 while ((p < end) && (header == nullptr)) {
3665 header = nmethod_section_label(p);
3666 pp = p;
3667 p += Assembler::instr_len(p);
3668 }
3669 if (pp > p0) {
3670 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3671 p0 = pp;
3672 p = pp;
3673 header = nullptr;
3674 } else if (header != nullptr) {
3675 st->bol();
3676 st->print_cr("%s", header);
3677 header = nullptr;
3678 }
3679 }
3680 //---< Close the output (Marker for post-mortem disassembler) >---
3681 st->bol();
3682 st->print_cr("[/MachCode]");
3683 return;
3684 }
3685 #endif
3686
3687 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3688 //---< abstract disassembly with comments and section headers merged in >---
3689 if (compressed_with_comments) {
3690 const_cast<nmethod*>(this)->print_constant_pool(st);
3691
3692 st->bol();
3693 st->cr();
3694 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3695 //---< Open the output (Marker for post-mortem disassembler) >---
3696 st->print_cr("[MachCode]");
3697 while ((p < end) && (p != nullptr)) {
3698 const int instruction_size_in_bytes = Assembler::instr_len(p);
3699
3700 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3701 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3702 // Prints nmethod_section_label as well.
3703 if (AbstractDisassembler::show_block_comment()) {
3704 print_block_comment(st, p);
3705 if (st->position() == 0) {
3706 compressed_format_idx = 0;
3707 }
3708 }
3709
3710 //---< New location information after line break >---
3711 if (compressed_format_idx == 0) {
3712 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3713 compressed_format_idx = 1;
3714 }
3715
3716 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3717 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3718 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3719
3720 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3721 //---< interrupt instruction byte stream for code comment >---
3722 if (compressed_format_idx > 1) {
3723 st->cr(); // interrupt byte stream
3724 st->cr(); // add an empty line
3725 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3726 }
3727 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3728 st->bol();
3729 compressed_format_idx = 0;
3730 }
3731
3732 //---< New location information after line break >---
3733 if (compressed_format_idx == 0) {
3734 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3735 compressed_format_idx = 1;
3736 }
3737
3738 //---< Nicely align instructions for readability >---
3739 if (compressed_format_idx > 1) {
3740 Disassembler::print_delimiter(st);
3741 }
3742
3743 //---< Now, finally, print the actual instruction bytes >---
3744 unsigned char* p0 = p;
3745 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3746 compressed_format_idx += (int)(p - p0);
3747
3748 if (Disassembler::start_newline(compressed_format_idx-1)) {
3749 st->cr();
3750 compressed_format_idx = 0;
3751 }
3752 }
3753 //---< Close the output (Marker for post-mortem disassembler) >---
3754 st->bol();
3755 st->print_cr("[/MachCode]");
3756 return;
3757 }
3758 #endif
3759 }
3760
3761 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3762
3763 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3764 RelocIterator iter(this, begin, end);
3765 bool have_one = false;
3766 while (iter.next()) {
3767 have_one = true;
3768 switch (iter.type()) {
3769 case relocInfo::none: {
3770 // Skip it and check next
3771 break;
3772 }
3773 case relocInfo::oop_type: {
3774 // Get a non-resizable resource-allocated stringStream.
3775 // Our callees make use of (nested) ResourceMarks.
3776 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3777 oop_Relocation* r = iter.oop_reloc();
3778 oop obj = r->oop_value();
3779 st.print("oop(");
3780 if (obj == nullptr) st.print("nullptr");
3781 else obj->print_value_on(&st);
3782 st.print(")");
3783 return st.as_string();
3784 }
3785 case relocInfo::metadata_type: {
3786 stringStream st;
3787 metadata_Relocation* r = iter.metadata_reloc();
3788 Metadata* obj = r->metadata_value();
3789 st.print("metadata(");
3790 if (obj == nullptr) st.print("nullptr");
3791 else obj->print_value_on(&st);
3792 st.print(")");
3793 return st.as_string();
3794 }
3795 case relocInfo::runtime_call_type:
3796 case relocInfo::runtime_call_w_cp_type: {
3797 stringStream st;
3798 st.print("runtime_call");
3799 CallRelocation* r = (CallRelocation*)iter.reloc();
3800 address dest = r->destination();
3801 if (StubRoutines::contains(dest)) {
3802 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3803 if (desc == nullptr) {
3804 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3805 }
3806 if (desc != nullptr) {
3807 st.print(" Stub::%s", desc->name());
3808 return st.as_string();
3809 }
3810 }
3811 CodeBlob* cb = CodeCache::find_blob(dest);
3812 if (cb != nullptr) {
3813 st.print(" %s", cb->name());
3814 } else {
3815 ResourceMark rm;
3816 const int buflen = 1024;
3817 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3818 int offset;
3819 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3820 st.print(" %s", buf);
3821 if (offset != 0) {
3822 st.print("+%d", offset);
3823 }
3824 }
3825 }
3826 return st.as_string();
3827 }
3828 case relocInfo::virtual_call_type: {
3829 stringStream st;
3830 st.print_raw("virtual_call");
3831 virtual_call_Relocation* r = iter.virtual_call_reloc();
3832 Method* m = r->method_value();
3833 if (m != nullptr) {
3834 assert(m->is_method(), "");
3835 m->print_short_name(&st);
3836 }
3837 return st.as_string();
3838 }
3839 case relocInfo::opt_virtual_call_type: {
3840 stringStream st;
3841 st.print_raw("optimized virtual_call");
3842 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3843 Method* m = r->method_value();
3844 if (m != nullptr) {
3845 assert(m->is_method(), "");
3846 m->print_short_name(&st);
3847 }
3848 return st.as_string();
3849 }
3850 case relocInfo::static_call_type: {
3851 stringStream st;
3852 st.print_raw("static_call");
3853 static_call_Relocation* r = iter.static_call_reloc();
3854 Method* m = r->method_value();
3855 if (m != nullptr) {
3856 assert(m->is_method(), "");
3857 m->print_short_name(&st);
3858 }
3859 return st.as_string();
3860 }
3861 case relocInfo::static_stub_type: return "static_stub";
3862 case relocInfo::external_word_type: return "external_word";
3863 case relocInfo::internal_word_type: return "internal_word";
3864 case relocInfo::section_word_type: return "section_word";
3865 case relocInfo::poll_type: return "poll";
3866 case relocInfo::poll_return_type: return "poll_return";
3867 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3868 case relocInfo::entry_guard_type: return "entry_guard";
3869 case relocInfo::post_call_nop_type: return "post_call_nop";
3870 case relocInfo::barrier_type: {
3871 barrier_Relocation* const reloc = iter.barrier_reloc();
3872 stringStream st;
3873 st.print("barrier format=%d", reloc->format());
3874 return st.as_string();
3875 }
3876
3877 case relocInfo::type_mask: return "type_bit_mask";
3878
3879 default: {
3880 stringStream st;
3881 st.print("unknown relocInfo=%d", (int) iter.type());
3882 return st.as_string();
3883 }
3884 }
3885 }
3886 return have_one ? "other" : nullptr;
3887 }
3888
3889 // Return the last scope in (begin..end]
3890 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3891 PcDesc* p = pc_desc_near(begin+1);
3892 if (p != nullptr && p->real_pc(this) <= end) {
3893 return new ScopeDesc(this, p);
3894 }
3895 return nullptr;
3896 }
3897
3898 const char* nmethod::nmethod_section_label(address pos) const {
3899 const char* label = nullptr;
3900 if (pos == code_begin()) label = "[Instructions begin]";
3901 if (pos == entry_point()) label = "[Entry Point]";
3902 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3903 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3904 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3905 // Check stub_code before checking exception_handler or deopt_handler.
3906 if (pos == this->stub_begin()) label = "[Stub Code]";
3907 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3908 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3909 return label;
3910 }
3911
3912 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3913 if (print_section_labels) {
3914 const char* label = nmethod_section_label(block_begin);
3915 if (label != nullptr) {
3916 stream->bol();
3917 stream->print_cr("%s", label);
3918 }
3919 }
3920
3921 if (block_begin == entry_point()) {
3922 Method* m = method();
3923 if (m != nullptr) {
3924 stream->print(" # ");
3925 m->print_value_on(stream);
3926 stream->cr();
3927 }
3928 if (m != nullptr && !is_osr_method()) {
3929 ResourceMark rm;
3930 int sizeargs = m->size_of_parameters();
3931 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3932 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3933 {
3934 int sig_index = 0;
3935 if (!m->is_static())
3936 sig_bt[sig_index++] = T_OBJECT; // 'this'
3937 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3938 BasicType t = ss.type();
3939 sig_bt[sig_index++] = t;
3940 if (type2size[t] == 2) {
3941 sig_bt[sig_index++] = T_VOID;
3942 } else {
3943 assert(type2size[t] == 1, "size is 1 or 2");
3944 }
3945 }
3946 assert(sig_index == sizeargs, "");
3947 }
3948 const char* spname = "sp"; // make arch-specific?
3949 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3950 int stack_slot_offset = this->frame_size() * wordSize;
3951 int tab1 = 14, tab2 = 24;
3952 int sig_index = 0;
3953 int arg_index = (m->is_static() ? 0 : -1);
3954 bool did_old_sp = false;
3955 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3956 bool at_this = (arg_index == -1);
3957 bool at_old_sp = false;
3958 BasicType t = (at_this ? T_OBJECT : ss.type());
3959 assert(t == sig_bt[sig_index], "sigs in sync");
3960 if (at_this)
3961 stream->print(" # this: ");
3962 else
3963 stream->print(" # parm%d: ", arg_index);
3964 stream->move_to(tab1);
3965 VMReg fst = regs[sig_index].first();
3966 VMReg snd = regs[sig_index].second();
3967 if (fst->is_reg()) {
3968 stream->print("%s", fst->name());
3969 if (snd->is_valid()) {
3970 stream->print(":%s", snd->name());
3971 }
3972 } else if (fst->is_stack()) {
3973 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3974 if (offset == stack_slot_offset) at_old_sp = true;
3975 stream->print("[%s+0x%x]", spname, offset);
3976 } else {
3977 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3978 }
3979 stream->print(" ");
3980 stream->move_to(tab2);
3981 stream->print("= ");
3982 if (at_this) {
3983 m->method_holder()->print_value_on(stream);
3984 } else {
3985 bool did_name = false;
3986 if (!at_this && ss.is_reference()) {
3987 Symbol* name = ss.as_symbol();
3988 name->print_value_on(stream);
3989 did_name = true;
3990 }
3991 if (!did_name)
3992 stream->print("%s", type2name(t));
3993 }
3994 if (at_old_sp) {
3995 stream->print(" (%s of caller)", spname);
3996 did_old_sp = true;
3997 }
3998 stream->cr();
3999 sig_index += type2size[t];
4000 arg_index += 1;
4001 if (!at_this) ss.next();
4002 }
4003 if (!did_old_sp) {
4004 stream->print(" # ");
4005 stream->move_to(tab1);
4006 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4007 stream->print(" (%s of caller)", spname);
4008 stream->cr();
4009 }
4010 }
4011 }
4012 }
4013
4014 // Returns whether this nmethod has code comments.
4015 bool nmethod::has_code_comment(address begin, address end) {
4016 // scopes?
4017 ScopeDesc* sd = scope_desc_in(begin, end);
4018 if (sd != nullptr) return true;
4019
4020 // relocations?
4021 const char* str = reloc_string_for(begin, end);
4022 if (str != nullptr) return true;
4023
4024 // implicit exceptions?
4025 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4026 if (cont_offset != 0) return true;
4027
4028 return false;
4029 }
4030
4031 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4032 ImplicitExceptionTable implicit_table(this);
4033 int pc_offset = (int)(begin - code_begin());
4034 int cont_offset = implicit_table.continuation_offset(pc_offset);
4035 bool oop_map_required = false;
4036 if (cont_offset != 0) {
4037 st->move_to(column, 6, 0);
4038 if (pc_offset == cont_offset) {
4039 st->print("; implicit exception: deoptimizes");
4040 oop_map_required = true;
4041 } else {
4042 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4043 }
4044 }
4045
4046 // Find an oopmap in (begin, end]. We use the odd half-closed
4047 // interval so that oop maps and scope descs which are tied to the
4048 // byte after a call are printed with the call itself. OopMaps
4049 // associated with implicit exceptions are printed with the implicit
4050 // instruction.
4051 address base = code_begin();
4052 ImmutableOopMapSet* oms = oop_maps();
4053 if (oms != nullptr) {
4054 for (int i = 0, imax = oms->count(); i < imax; i++) {
4055 const ImmutableOopMapPair* pair = oms->pair_at(i);
4056 const ImmutableOopMap* om = pair->get_from(oms);
4057 address pc = base + pair->pc_offset();
4058 if (pc >= begin) {
4059 #if INCLUDE_JVMCI
4060 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4061 #else
4062 bool is_implicit_deopt = false;
4063 #endif
4064 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4065 st->move_to(column, 6, 0);
4066 st->print("; ");
4067 om->print_on(st);
4068 oop_map_required = false;
4069 }
4070 }
4071 if (pc > end) {
4072 break;
4073 }
4074 }
4075 }
4076 assert(!oop_map_required, "missed oopmap");
4077
4078 Thread* thread = Thread::current();
4079
4080 // Print any debug info present at this pc.
4081 ScopeDesc* sd = scope_desc_in(begin, end);
4082 if (sd != nullptr) {
4083 st->move_to(column, 6, 0);
4084 if (sd->bci() == SynchronizationEntryBCI) {
4085 st->print(";*synchronization entry");
4086 } else if (sd->bci() == AfterBci) {
4087 st->print(";* method exit (unlocked if synchronized)");
4088 } else if (sd->bci() == UnwindBci) {
4089 st->print(";* unwind (locked if synchronized)");
4090 } else if (sd->bci() == AfterExceptionBci) {
4091 st->print(";* unwind (unlocked if synchronized)");
4092 } else if (sd->bci() == UnknownBci) {
4093 st->print(";* unknown");
4094 } else if (sd->bci() == InvalidFrameStateBci) {
4095 st->print(";* invalid frame state");
4096 } else {
4097 if (sd->method() == nullptr) {
4098 st->print("method is nullptr");
4099 } else if (sd->method()->is_native()) {
4100 st->print("method is native");
4101 } else {
4102 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4103 st->print(";*%s", Bytecodes::name(bc));
4104 switch (bc) {
4105 case Bytecodes::_invokevirtual:
4106 case Bytecodes::_invokespecial:
4107 case Bytecodes::_invokestatic:
4108 case Bytecodes::_invokeinterface:
4109 {
4110 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4111 st->print(" ");
4112 if (invoke.name() != nullptr)
4113 invoke.name()->print_symbol_on(st);
4114 else
4115 st->print("<UNKNOWN>");
4116 break;
4117 }
4118 case Bytecodes::_getfield:
4119 case Bytecodes::_putfield:
4120 case Bytecodes::_getstatic:
4121 case Bytecodes::_putstatic:
4122 {
4123 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4124 st->print(" ");
4125 if (field.name() != nullptr)
4126 field.name()->print_symbol_on(st);
4127 else
4128 st->print("<UNKNOWN>");
4129 }
4130 default:
4131 break;
4132 }
4133 }
4134 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4135 }
4136
4137 // Print all scopes
4138 for (;sd != nullptr; sd = sd->sender()) {
4139 st->move_to(column, 6, 0);
4140 st->print("; -");
4141 if (sd->should_reexecute()) {
4142 st->print(" (reexecute)");
4143 }
4144 if (sd->method() == nullptr) {
4145 st->print("method is nullptr");
4146 } else {
4147 sd->method()->print_short_name(st);
4148 }
4149 int lineno = sd->method()->line_number_from_bci(sd->bci());
4150 if (lineno != -1) {
4151 st->print("@%d (line %d)", sd->bci(), lineno);
4152 } else {
4153 st->print("@%d", sd->bci());
4154 }
4155 st->cr();
4156 }
4157 }
4158
4159 // Print relocation information
4160 // Prevent memory leak: allocating without ResourceMark.
4161 ResourceMark rm;
4162 const char* str = reloc_string_for(begin, end);
4163 if (str != nullptr) {
4164 if (sd != nullptr) st->cr();
4165 st->move_to(column, 6, 0);
4166 st->print("; {%s}", str);
4167 }
4168 }
4169
4170 #endif
4171
4172 address nmethod::call_instruction_address(address pc) const {
4173 if (NativeCall::is_call_before(pc)) {
4174 NativeCall *ncall = nativeCall_before(pc);
4175 return ncall->instruction_address();
4176 }
4177 return nullptr;
4178 }
4179
4180 void nmethod::print_value_on_impl(outputStream* st) const {
4181 st->print_cr("nmethod");
4182 #if defined(SUPPORT_DATA_STRUCTS)
4183 print_on_with_msg(st, nullptr);
4184 #endif
4185 }
4186
4187 #ifndef PRODUCT
4188
4189 void nmethod::print_calls(outputStream* st) {
4190 RelocIterator iter(this);
4191 while (iter.next()) {
4192 switch (iter.type()) {
4193 case relocInfo::virtual_call_type: {
4194 CompiledICLocker ml_verify(this);
4195 CompiledIC_at(&iter)->print();
4196 break;
4197 }
4198 case relocInfo::static_call_type:
4199 case relocInfo::opt_virtual_call_type:
4200 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4201 CompiledDirectCall::at(iter.reloc())->print();
4202 break;
4203 default:
4204 break;
4205 }
4206 }
4207 }
4208
4209 void nmethod::print_statistics() {
4210 ttyLocker ttyl;
4211 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4212 native_nmethod_stats.print_native_nmethod_stats();
4213 #ifdef COMPILER1
4214 c1_java_nmethod_stats.print_nmethod_stats("C1");
4215 #endif
4216 #ifdef COMPILER2
4217 c2_java_nmethod_stats.print_nmethod_stats("C2");
4218 #endif
4219 #if INCLUDE_JVMCI
4220 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4221 #endif
4222 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4223 DebugInformationRecorder::print_statistics();
4224 pc_nmethod_stats.print_pc_stats();
4225 Dependencies::print_statistics();
4226 ExternalsRecorder::print_statistics();
4227 if (xtty != nullptr) xtty->tail("statistics");
4228 }
4229
4230 #endif // !PRODUCT
4231
4232 #if INCLUDE_JVMCI
4233 void nmethod::update_speculation(JavaThread* thread) {
4234 jlong speculation = thread->pending_failed_speculation();
4235 if (speculation != 0) {
4236 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4237 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4238 thread->set_pending_failed_speculation(0);
4239 }
4240 }
4241
4242 const char* nmethod::jvmci_name() {
4243 if (jvmci_nmethod_data() != nullptr) {
4244 return jvmci_nmethod_data()->name();
4245 }
4246 return nullptr;
4247 }
4248
4249 bool nmethod::jvmci_skip_profile_deopt() const {
4250 return jvmci_nmethod_data() != nullptr && !jvmci_nmethod_data()->profile_deopt();
4251 }
4252 #endif
4253
4254 void nmethod::prepare_for_archiving_impl() {
4255 CodeBlob::prepare_for_archiving_impl();
4256 _deoptimization_generation = 0;
4257 _gc_epoch = 0;
4258 _method_profiling_count = 0;
4259 _osr_link = nullptr;
4260 _method = nullptr;
4261 _immutable_data = nullptr;
4262 _pc_desc_container = nullptr;
4263 _exception_cache = nullptr;
4264 _gc_data = nullptr;
4265 _oops_do_mark_link = nullptr;
4266 _compiled_ic_data = nullptr;
4267 _osr_entry_point = nullptr;
4268 _compile_id = -1;
4269 _deoptimization_status = not_marked;
4270 _is_unloading_state = 0;
4271 _state = not_installed;
4272 }