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/codeCache.hpp"
27 #include "code/compiledIC.hpp"
28 #include "code/dependencies.hpp"
29 #include "code/nativeInst.hpp"
30 #include "code/nmethod.inline.hpp"
31 #include "code/scopeDesc.hpp"
32 #include "code/SCCache.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compileTask.hpp"
38 #include "compiler/compilerDirectives.hpp"
39 #include "compiler/compilerOracle.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/continuation.hpp"
64 #include "runtime/atomic.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/resourceHash.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 assert(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing);
117
118 //---------------------------------------------------------------------------------
119 // NMethod statistics
120 // They are printed under various flags, including:
121 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
122 // (In the latter two cases, they like other stats are printed to the log only.)
123
124 #ifndef PRODUCT
125 // These variables are put into one block to reduce relocations
126 // and make it simpler to print from the debugger.
127 struct java_nmethod_stats_struct {
128 uint nmethod_count;
129 uint total_nm_size;
130 uint total_immut_size;
131 uint total_mut_size;
132 uint relocation_size;
133 uint consts_size;
134 uint insts_size;
135 uint stub_size;
136 uint oops_size;
137 uint metadata_size;
138 uint dependencies_size;
139 uint nul_chk_table_size;
140 uint handler_table_size;
141 uint scopes_pcs_size;
142 uint scopes_data_size;
143 #if INCLUDE_JVMCI
144 uint speculations_size;
145 uint jvmci_data_size;
146 #endif
147
148 void note_nmethod(nmethod* nm) {
149 nmethod_count += 1;
150 total_nm_size += nm->size();
151 total_immut_size += nm->immutable_data_size();
152 total_mut_size += nm->mutable_data_size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 #if INCLUDE_JVMCI
165 speculations_size += nm->speculations_size();
166 jvmci_data_size += nm->jvmci_data_size();
167 #endif
168 }
169 void print_nmethod_stats(const char* name) {
170 if (nmethod_count == 0) return;
171 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
172 uint total_size = total_nm_size + total_immut_size + total_mut_size;
173 if (total_nm_size != 0) {
174 tty->print_cr(" total size = %u (100%%)", total_size);
175 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
176 }
177 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
178 if (nmethod_count != 0) {
179 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
180 }
181 if (consts_size != 0) {
182 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
183 }
184 if (insts_size != 0) {
185 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
186 }
187 if (stub_size != 0) {
188 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
189 }
190 if (oops_size != 0) {
191 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
192 }
193 if (total_mut_size != 0) {
194 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
195 }
196 if (relocation_size != 0) {
197 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
198 }
199 if (metadata_size != 0) {
200 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
201 }
202 #if INCLUDE_JVMCI
203 if (jvmci_data_size != 0) {
204 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_mut_size);
205 }
206 #endif
207 if (total_immut_size != 0) {
208 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
209 }
210 if (dependencies_size != 0) {
211 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
212 }
213 if (nul_chk_table_size != 0) {
214 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
215 }
216 if (handler_table_size != 0) {
217 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
218 }
219 if (scopes_pcs_size != 0) {
220 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
221 }
222 if (scopes_data_size != 0) {
223 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
224 }
225 #if INCLUDE_JVMCI
226 if (speculations_size != 0) {
227 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size);
228 }
229 #endif
230 }
231 };
232
233 struct native_nmethod_stats_struct {
234 uint native_nmethod_count;
235 uint native_total_size;
236 uint native_relocation_size;
237 uint native_insts_size;
238 uint native_oops_size;
239 uint native_metadata_size;
240 void note_native_nmethod(nmethod* nm) {
241 native_nmethod_count += 1;
242 native_total_size += nm->size();
243 native_relocation_size += nm->relocation_size();
244 native_insts_size += nm->insts_size();
245 native_oops_size += nm->oops_size();
246 native_metadata_size += nm->metadata_size();
247 }
248 void print_native_nmethod_stats() {
249 if (native_nmethod_count == 0) return;
250 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
251 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
252 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
253 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
254 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
255 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
256 }
257 };
258
259 struct pc_nmethod_stats_struct {
260 uint pc_desc_init; // number of initialization of cache (= number of caches)
261 uint pc_desc_queries; // queries to nmethod::find_pc_desc
262 uint pc_desc_approx; // number of those which have approximate true
263 uint pc_desc_repeats; // number of _pc_descs[0] hits
264 uint pc_desc_hits; // number of LRU cache hits
265 uint pc_desc_tests; // total number of PcDesc examinations
266 uint pc_desc_searches; // total number of quasi-binary search steps
267 uint pc_desc_adds; // number of LUR cache insertions
268
269 void print_pc_stats() {
270 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
271 pc_desc_queries,
272 (double)(pc_desc_tests + pc_desc_searches)
273 / pc_desc_queries);
274 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
275 pc_desc_init,
276 pc_desc_queries, pc_desc_approx,
277 pc_desc_repeats, pc_desc_hits,
278 pc_desc_tests, pc_desc_searches, pc_desc_adds);
279 }
280 };
281
282 #ifdef COMPILER1
283 static java_nmethod_stats_struct c1_java_nmethod_stats;
284 #endif
285 #ifdef COMPILER2
286 static java_nmethod_stats_struct c2_java_nmethod_stats;
287 #endif
288 #if INCLUDE_JVMCI
289 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
290 #endif
291 static java_nmethod_stats_struct unknown_java_nmethod_stats;
292
293 static native_nmethod_stats_struct native_nmethod_stats;
294 static pc_nmethod_stats_struct pc_nmethod_stats;
295
296 static void note_java_nmethod(nmethod* nm) {
297 #ifdef COMPILER1
298 if (nm->is_compiled_by_c1()) {
299 c1_java_nmethod_stats.note_nmethod(nm);
300 } else
301 #endif
302 #ifdef COMPILER2
303 if (nm->is_compiled_by_c2()) {
304 c2_java_nmethod_stats.note_nmethod(nm);
305 } else
306 #endif
307 #if INCLUDE_JVMCI
308 if (nm->is_compiled_by_jvmci()) {
309 jvmci_java_nmethod_stats.note_nmethod(nm);
310 } else
311 #endif
312 {
313 unknown_java_nmethod_stats.note_nmethod(nm);
314 }
315 }
316 #endif // !PRODUCT
317
318 //---------------------------------------------------------------------------------
319
320
321 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
322 assert(pc != nullptr, "Must be non null");
323 assert(exception.not_null(), "Must be non null");
324 assert(handler != nullptr, "Must be non null");
325
326 _count = 0;
327 _exception_type = exception->klass();
328 _next = nullptr;
329 _purge_list_next = nullptr;
330
331 add_address_and_handler(pc,handler);
332 }
333
334
335 address ExceptionCache::match(Handle exception, address pc) {
336 assert(pc != nullptr,"Must be non null");
337 assert(exception.not_null(),"Must be non null");
338 if (exception->klass() == exception_type()) {
339 return (test_address(pc));
340 }
341
342 return nullptr;
343 }
344
345
346 bool ExceptionCache::match_exception_with_space(Handle exception) {
347 assert(exception.not_null(),"Must be non null");
348 if (exception->klass() == exception_type() && count() < cache_size) {
349 return true;
350 }
351 return false;
352 }
353
354
355 address ExceptionCache::test_address(address addr) {
356 int limit = count();
357 for (int i = 0; i < limit; i++) {
358 if (pc_at(i) == addr) {
359 return handler_at(i);
360 }
361 }
362 return nullptr;
363 }
364
365
366 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
367 if (test_address(addr) == handler) return true;
368
369 int index = count();
370 if (index < cache_size) {
371 set_pc_at(index, addr);
372 set_handler_at(index, handler);
373 increment_count();
374 return true;
375 }
376 return false;
377 }
378
379 ExceptionCache* ExceptionCache::next() {
380 return Atomic::load(&_next);
381 }
382
383 void ExceptionCache::set_next(ExceptionCache *ec) {
384 Atomic::store(&_next, ec);
385 }
386
387 //-----------------------------------------------------------------------------
388
389
390 // Helper used by both find_pc_desc methods.
391 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
393 if (!approximate) {
394 return pc->pc_offset() == pc_offset;
395 } else {
396 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset();
397 }
398 }
399
400 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
401 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
402 // initialize the cache by filling it with benign (non-null) values
403 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
404 "must start with a sentinel");
405 for (int i = 0; i < cache_size; i++) {
406 _pc_descs[i] = initial_pc_desc;
407 }
408 }
409
410 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
411 // Note: one might think that caching the most recently
412 // read value separately would be a win, but one would be
413 // wrong. When many threads are updating it, the cache
414 // line it's in would bounce between caches, negating
415 // any benefit.
416
417 // In order to prevent race conditions do not load cache elements
418 // repeatedly, but use a local copy:
419 PcDesc* res;
420
421 // Step one: Check the most recently added value.
422 res = _pc_descs[0];
423 assert(res != nullptr, "PcDesc cache should be initialized already");
424
425 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
426 if (approximate && match_desc(res, pc_offset, approximate)) {
427 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
428 return res;
429 }
430
431 // Step two: Check the rest of the LRU cache.
432 for (int i = 1; i < cache_size; ++i) {
433 res = _pc_descs[i];
434 if (res->pc_offset() < 0) break; // optimization: skip empty cache
435 if (match_desc(res, pc_offset, approximate)) {
436 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
437 return res;
438 }
439 }
440
441 // Report failure.
442 return nullptr;
443 }
444
445 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
446 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
447 // Update the LRU cache by shifting pc_desc forward.
448 for (int i = 0; i < cache_size; i++) {
449 PcDesc* next = _pc_descs[i];
450 _pc_descs[i] = pc_desc;
451 pc_desc = next;
452 }
453 }
454
455 // adjust pcs_size so that it is a multiple of both oopSize and
456 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
457 // of oopSize, then 2*sizeof(PcDesc) is)
458 static int adjust_pcs_size(int pcs_size) {
459 int nsize = align_up(pcs_size, oopSize);
460 if ((nsize % sizeof(PcDesc)) != 0) {
461 nsize = pcs_size + sizeof(PcDesc);
462 }
463 assert((nsize % oopSize) == 0, "correct alignment");
464 return nsize;
465 }
466
467 bool nmethod::is_method_handle_return(address return_pc) {
468 if (!has_method_handle_invokes()) return false;
469 PcDesc* pd = pc_desc_at(return_pc);
470 if (pd == nullptr)
471 return false;
472 return pd->is_method_handle_invoke();
473 }
474
475 // Returns a string version of the method state.
476 const char* nmethod::state() const {
477 int state = get_state();
478 switch (state) {
479 case not_installed:
480 return "not installed";
481 case in_use:
482 return "in use";
483 case not_entrant:
484 return "not_entrant";
485 default:
486 fatal("unexpected method state: %d", state);
487 return nullptr;
488 }
489 }
490
491 void nmethod::set_deoptimized_done() {
492 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
493 if (_deoptimization_status != deoptimize_done) { // can't go backwards
494 Atomic::store(&_deoptimization_status, deoptimize_done);
495 }
496 }
497
498 ExceptionCache* nmethod::exception_cache_acquire() const {
499 return Atomic::load_acquire(&_exception_cache);
500 }
501
502 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
503 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
504 assert(new_entry != nullptr,"Must be non null");
505 assert(new_entry->next() == nullptr, "Must be null");
506
507 for (;;) {
508 ExceptionCache *ec = exception_cache();
509 if (ec != nullptr) {
510 Klass* ex_klass = ec->exception_type();
511 if (!ex_klass->is_loader_alive()) {
512 // We must guarantee that entries are not inserted with new next pointer
513 // edges to ExceptionCache entries with dead klasses, due to bad interactions
514 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
515 // the head pointer forward to the first live ExceptionCache, so that the new
516 // next pointers always point at live ExceptionCaches, that are not removed due
517 // to concurrent ExceptionCache cleanup.
518 ExceptionCache* next = ec->next();
519 if (Atomic::cmpxchg(&_exception_cache, ec, next) == ec) {
520 CodeCache::release_exception_cache(ec);
521 }
522 continue;
523 }
524 ec = exception_cache();
525 if (ec != nullptr) {
526 new_entry->set_next(ec);
527 }
528 }
529 if (Atomic::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
530 return;
531 }
532 }
533 }
534
535 void nmethod::clean_exception_cache() {
536 // For each nmethod, only a single thread may call this cleanup function
537 // at the same time, whether called in STW cleanup or concurrent cleanup.
538 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
539 // then a single writer may contend with cleaning up the head pointer to the
540 // first ExceptionCache node that has a Klass* that is alive. That is fine,
541 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
542 // And the concurrent writers do not clean up next pointers, only the head.
543 // Also note that concurrent readers will walk through Klass* pointers that are not
544 // alive. That does not cause ABA problems, because Klass* is deleted after
545 // a handshake with all threads, after all stale ExceptionCaches have been
546 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
547 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
548 // That similarly implies that CAS operations on ExceptionCache entries do not
549 // suffer from ABA problems as unlinking and deletion is separated by a global
550 // handshake operation.
551 ExceptionCache* prev = nullptr;
552 ExceptionCache* curr = exception_cache_acquire();
553
554 while (curr != nullptr) {
555 ExceptionCache* next = curr->next();
556
557 if (!curr->exception_type()->is_loader_alive()) {
558 if (prev == nullptr) {
559 // Try to clean head; this is contended by concurrent inserts, that
560 // both lazily clean the head, and insert entries at the head. If
561 // the CAS fails, the operation is restarted.
562 if (Atomic::cmpxchg(&_exception_cache, curr, next) != curr) {
563 prev = nullptr;
564 curr = exception_cache_acquire();
565 continue;
566 }
567 } else {
568 // It is impossible to during cleanup connect the next pointer to
569 // an ExceptionCache that has not been published before a safepoint
570 // prior to the cleanup. Therefore, release is not required.
571 prev->set_next(next);
572 }
573 // prev stays the same.
574
575 CodeCache::release_exception_cache(curr);
576 } else {
577 prev = curr;
578 }
579
580 curr = next;
581 }
582 }
583
584 // public method for accessing the exception cache
585 // These are the public access methods.
586 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
587 // We never grab a lock to read the exception cache, so we may
588 // have false negatives. This is okay, as it can only happen during
589 // the first few exception lookups for a given nmethod.
590 ExceptionCache* ec = exception_cache_acquire();
591 while (ec != nullptr) {
592 address ret_val;
593 if ((ret_val = ec->match(exception,pc)) != nullptr) {
594 return ret_val;
595 }
596 ec = ec->next();
597 }
598 return nullptr;
599 }
600
601 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
602 // There are potential race conditions during exception cache updates, so we
603 // must own the ExceptionCache_lock before doing ANY modifications. Because
604 // we don't lock during reads, it is possible to have several threads attempt
605 // to update the cache with the same data. We need to check for already inserted
606 // copies of the current data before adding it.
607
608 MutexLocker ml(ExceptionCache_lock);
609 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
610
611 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
612 target_entry = new ExceptionCache(exception,pc,handler);
613 add_exception_cache_entry(target_entry);
614 }
615 }
616
617 // private method for handling exception cache
618 // These methods are private, and used to manipulate the exception cache
619 // directly.
620 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
621 ExceptionCache* ec = exception_cache_acquire();
622 while (ec != nullptr) {
623 if (ec->match_exception_with_space(exception)) {
624 return ec;
625 }
626 ec = ec->next();
627 }
628 return nullptr;
629 }
630
631 bool nmethod::is_at_poll_return(address pc) {
632 RelocIterator iter(this, pc, pc+1);
633 while (iter.next()) {
634 if (iter.type() == relocInfo::poll_return_type)
635 return true;
636 }
637 return false;
638 }
639
640
641 bool nmethod::is_at_poll_or_poll_return(address pc) {
642 RelocIterator iter(this, pc, pc+1);
643 while (iter.next()) {
644 relocInfo::relocType t = iter.type();
645 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
646 return true;
647 }
648 return false;
649 }
650
651 void nmethod::verify_oop_relocations() {
652 // Ensure sure that the code matches the current oop values
653 RelocIterator iter(this, nullptr, nullptr);
654 while (iter.next()) {
655 if (iter.type() == relocInfo::oop_type) {
656 oop_Relocation* reloc = iter.oop_reloc();
657 if (!reloc->oop_is_immediate()) {
658 reloc->verify_oop_relocation();
659 }
660 }
661 }
662 }
663
664
665 ScopeDesc* nmethod::scope_desc_at(address pc) {
666 PcDesc* pd = pc_desc_at(pc);
667 guarantee(pd != nullptr, "scope must be present");
668 return new ScopeDesc(this, pd);
669 }
670
671 ScopeDesc* nmethod::scope_desc_near(address pc) {
672 PcDesc* pd = pc_desc_near(pc);
673 guarantee(pd != nullptr, "scope must be present");
674 return new ScopeDesc(this, pd);
675 }
676
677 address nmethod::oops_reloc_begin() const {
678 // If the method is not entrant then a JMP is plastered over the
679 // first few bytes. If an oop in the old code was there, that oop
680 // should not get GC'd. Skip the first few bytes of oops on
681 // not-entrant methods.
682 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
683 code_begin() + frame_complete_offset() >
684 verified_entry_point() + NativeJump::instruction_size)
685 {
686 // If we have a frame_complete_offset after the native jump, then there
687 // is no point trying to look for oops before that. This is a requirement
688 // for being allowed to scan oops concurrently.
689 return code_begin() + frame_complete_offset();
690 }
691
692 address low_boundary = verified_entry_point();
693 if (!is_in_use()) {
694 low_boundary += NativeJump::instruction_size;
695 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump.
696 // This means that the low_boundary is going to be a little too high.
697 // This shouldn't matter, since oops of non-entrant methods are never used.
698 // In fact, why are we bothering to look at oops in a non-entrant method??
699 }
700 return low_boundary;
701 }
702
703 // Method that knows how to preserve outgoing arguments at call. This method must be
704 // called with a frame corresponding to a Java invoke
705 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
706 if (method() == nullptr) {
707 return;
708 }
709
710 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
711 JavaThread* thread = reg_map->thread();
712 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
713 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
714 return;
715 }
716
717 if (!method()->is_native()) {
718 address pc = fr.pc();
719 bool has_receiver, has_appendix;
720 Symbol* signature;
721
722 // The method attached by JIT-compilers should be used, if present.
723 // Bytecode can be inaccurate in such case.
724 Method* callee = attached_method_before_pc(pc);
725 if (callee != nullptr) {
726 has_receiver = !(callee->access_flags().is_static());
727 has_appendix = false;
728 signature = callee->signature();
729 } else {
730 SimpleScopeDesc ssd(this, pc);
731
732 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
733 has_receiver = call.has_receiver();
734 has_appendix = call.has_appendix();
735 signature = call.signature();
736 }
737
738 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
739 } else if (method()->is_continuation_enter_intrinsic()) {
740 // This method only calls Continuation.enter()
741 Symbol* signature = vmSymbols::continuationEnter_signature();
742 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
743 }
744 }
745
746 Method* nmethod::attached_method(address call_instr) {
747 assert(code_contains(call_instr), "not part of the nmethod");
748 RelocIterator iter(this, call_instr, call_instr + 1);
749 while (iter.next()) {
750 if (iter.addr() == call_instr) {
751 switch(iter.type()) {
752 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
753 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
754 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
755 default: break;
756 }
757 }
758 }
759 return nullptr; // not found
760 }
761
762 Method* nmethod::attached_method_before_pc(address pc) {
763 if (NativeCall::is_call_before(pc)) {
764 NativeCall* ncall = nativeCall_before(pc);
765 return attached_method(ncall->instruction_address());
766 }
767 return nullptr; // not a call
768 }
769
770 void nmethod::clear_inline_caches() {
771 assert(SafepointSynchronize::is_at_safepoint(), "clearing of IC's only allowed at safepoint");
772 RelocIterator iter(this);
773 while (iter.next()) {
774 iter.reloc()->clear_inline_cache();
775 }
776 }
777
778 #ifdef ASSERT
779 // Check class_loader is alive for this bit of metadata.
780 class CheckClass : public MetadataClosure {
781 void do_metadata(Metadata* md) {
782 Klass* klass = nullptr;
783 if (md->is_klass()) {
784 klass = ((Klass*)md);
785 } else if (md->is_method()) {
786 klass = ((Method*)md)->method_holder();
787 } else if (md->is_methodData()) {
788 klass = ((MethodData*)md)->method()->method_holder();
789 } else if (md->is_methodCounters()) {
790 klass = ((MethodCounters*)md)->method()->method_holder();
791 } else {
792 md->print();
793 ShouldNotReachHere();
794 }
795 assert(klass->is_loader_alive(), "must be alive");
796 }
797 };
798 #endif // ASSERT
799
800
801 static void clean_ic_if_metadata_is_dead(CompiledIC *ic) {
802 ic->clean_metadata();
803 }
804
805 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
806 template <typename CallsiteT>
807 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, nmethod* from,
808 bool clean_all) {
809 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
810 if (!cb->is_nmethod()) {
811 return;
812 }
813 nmethod* nm = cb->as_nmethod();
814 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
815 callsite->set_to_clean();
816 }
817 }
818
819 // Cleans caches in nmethods that point to either classes that are unloaded
820 // or nmethods that are unloaded.
821 //
822 // Can be called either in parallel by G1 currently or after all
823 // nmethods are unloaded. Return postponed=true in the parallel case for
824 // inline caches found that point to nmethods that are not yet visited during
825 // the do_unloading walk.
826 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
827 ResourceMark rm;
828
829 // Exception cache only needs to be called if unloading occurred
830 if (unloading_occurred) {
831 clean_exception_cache();
832 }
833
834 cleanup_inline_caches_impl(unloading_occurred, false);
835
836 #ifdef ASSERT
837 // Check that the metadata embedded in the nmethod is alive
838 CheckClass check_class;
839 metadata_do(&check_class);
840 #endif
841 }
842
843 void nmethod::run_nmethod_entry_barrier() {
844 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
845 if (bs_nm != nullptr) {
846 // We want to keep an invariant that nmethods found through iterations of a Thread's
847 // nmethods found in safepoints have gone through an entry barrier and are not armed.
848 // By calling this nmethod entry barrier, it plays along and acts
849 // like any other nmethod found on the stack of a thread (fewer surprises).
850 nmethod* nm = this;
851 bool alive = bs_nm->nmethod_entry_barrier(nm);
852 assert(alive, "should be alive");
853 }
854 }
855
856 // Only called by whitebox test
857 void nmethod::cleanup_inline_caches_whitebox() {
858 assert_locked_or_safepoint(CodeCache_lock);
859 CompiledICLocker ic_locker(this);
860 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
861 }
862
863 address* nmethod::orig_pc_addr(const frame* fr) {
864 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
865 }
866
867 // Called to clean up after class unloading for live nmethods
868 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
869 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
870 ResourceMark rm;
871
872 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
873 RelocIterator iter(this, oops_reloc_begin());
874 bool is_in_static_stub = false;
875 while(iter.next()) {
876
877 switch (iter.type()) {
878
879 case relocInfo::virtual_call_type:
880 if (unloading_occurred) {
881 // If class unloading occurred we first clear ICs where the cached metadata
882 // is referring to an unloaded klass or method.
883 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter));
884 }
885
886 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, clean_all);
887 break;
888
889 case relocInfo::opt_virtual_call_type:
890 case relocInfo::static_call_type:
891 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), this, clean_all);
892 break;
893
894 case relocInfo::static_stub_type: {
895 is_in_static_stub = true;
896 break;
897 }
898
899 case relocInfo::metadata_type: {
900 // Only the metadata relocations contained in static/opt virtual call stubs
901 // contains the Method* passed to c2i adapters. It is the only metadata
902 // relocation that needs to be walked, as it is the one metadata relocation
903 // that violates the invariant that all metadata relocations have an oop
904 // in the compiled method (due to deferred resolution and code patching).
905
906 // This causes dead metadata to remain in compiled methods that are not
907 // unloading. Unless these slippery metadata relocations of the static
908 // stubs are at least cleared, subsequent class redefinition operations
909 // will access potentially free memory, and JavaThread execution
910 // concurrent to class unloading may call c2i adapters with dead methods.
911 if (!is_in_static_stub) {
912 // The first metadata relocation after a static stub relocation is the
913 // metadata relocation of the static stub used to pass the Method* to
914 // c2i adapters.
915 continue;
916 }
917 is_in_static_stub = false;
918 if (is_unloading()) {
919 // If the nmethod itself is dying, then it may point at dead metadata.
920 // Nobody should follow that metadata; it is strictly unsafe.
921 continue;
922 }
923 metadata_Relocation* r = iter.metadata_reloc();
924 Metadata* md = r->metadata_value();
925 if (md != nullptr && md->is_method()) {
926 Method* method = static_cast<Method*>(md);
927 if (!method->method_holder()->is_loader_alive()) {
928 Atomic::store(r->metadata_addr(), (Method*)nullptr);
929
930 if (!r->metadata_is_immediate()) {
931 r->fix_metadata_relocation();
932 }
933 }
934 }
935 break;
936 }
937
938 default:
939 break;
940 }
941 }
942 }
943
944 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
945 // Exception happened outside inline-cache check code => we are inside
946 // an active nmethod => use cpc to determine a return address
947 int exception_offset = int(pc - code_begin());
948 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
949 #ifdef ASSERT
950 if (cont_offset == 0) {
951 Thread* thread = Thread::current();
952 ResourceMark rm(thread);
953 CodeBlob* cb = CodeCache::find_blob(pc);
954 assert(cb != nullptr && cb == this, "");
955
956 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
957 stringStream ss;
958 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
959 print_on(&ss);
960 method()->print_codes_on(&ss);
961 print_code_on(&ss);
962 print_pcs_on(&ss);
963 tty->print("%s", ss.as_string()); // print all at once
964 }
965 #endif
966 if (cont_offset == 0) {
967 // Let the normal error handling report the exception
968 return nullptr;
969 }
970 if (cont_offset == exception_offset) {
971 #if INCLUDE_JVMCI
972 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
973 JavaThread *thread = JavaThread::current();
974 thread->set_jvmci_implicit_exception_pc(pc);
975 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
976 Deoptimization::Action_reinterpret));
977 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
978 #else
979 ShouldNotReachHere();
980 #endif
981 }
982 return code_begin() + cont_offset;
983 }
984
985 class HasEvolDependency : public MetadataClosure {
986 bool _has_evol_dependency;
987 public:
988 HasEvolDependency() : _has_evol_dependency(false) {}
989 void do_metadata(Metadata* md) {
990 if (md->is_method()) {
991 Method* method = (Method*)md;
992 if (method->is_old()) {
993 _has_evol_dependency = true;
994 }
995 }
996 }
997 bool has_evol_dependency() const { return _has_evol_dependency; }
998 };
999
1000 bool nmethod::has_evol_metadata() {
1001 // Check the metadata in relocIter and CompiledIC and also deoptimize
1002 // any nmethod that has reference to old methods.
1003 HasEvolDependency check_evol;
1004 metadata_do(&check_evol);
1005 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
1006 ResourceMark rm;
1007 log_debug(redefine, class, nmethod)
1008 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
1009 _method->method_holder()->external_name(),
1010 _method->name()->as_C_string(),
1011 _method->signature()->as_C_string(),
1012 compile_id());
1013 }
1014 return check_evol.has_evol_dependency();
1015 }
1016
1017 int nmethod::total_size() const {
1018 return
1019 consts_size() +
1020 insts_size() +
1021 stub_size() +
1022 scopes_data_size() +
1023 scopes_pcs_size() +
1024 handler_table_size() +
1025 nul_chk_table_size();
1026 }
1027
1028 const char* nmethod::compile_kind() const {
1029 if (is_osr_method()) return "osr";
1030 if (method() != nullptr && is_native_method()) {
1031 if (method()->is_continuation_native_intrinsic()) {
1032 return "cnt";
1033 }
1034 return "c2n";
1035 }
1036 return nullptr;
1037 }
1038
1039 const char* nmethod::compiler_name() const {
1040 return compilertype2name(_compiler_type);
1041 }
1042
1043 #ifdef ASSERT
1044 class CheckForOopsClosure : public OopClosure {
1045 bool _found_oop = false;
1046 public:
1047 virtual void do_oop(oop* o) { _found_oop = true; }
1048 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1049 bool found_oop() { return _found_oop; }
1050 };
1051 class CheckForMetadataClosure : public MetadataClosure {
1052 bool _found_metadata = false;
1053 Metadata* _ignore = nullptr;
1054 public:
1055 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1056 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1057 bool found_metadata() { return _found_metadata; }
1058 };
1059
1060 static void assert_no_oops_or_metadata(nmethod* nm) {
1061 if (nm == nullptr) return;
1062 assert(nm->oop_maps() == nullptr, "expectation");
1063
1064 CheckForOopsClosure cfo;
1065 nm->oops_do(&cfo);
1066 assert(!cfo.found_oop(), "no oops allowed");
1067
1068 // We allow an exception for the own Method, but require its class to be permanent.
1069 Method* own_method = nm->method();
1070 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1071 nm->metadata_do(&cfm);
1072 assert(!cfm.found_metadata(), "no metadata allowed");
1073
1074 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1075 "Method's class needs to be permanent");
1076 }
1077 #endif
1078
1079 static int required_mutable_data_size(CodeBuffer* code_buffer,
1080 int jvmci_data_size = 0) {
1081 return align_up(code_buffer->total_relocation_size(), oopSize) +
1082 align_up(code_buffer->total_metadata_size(), oopSize) +
1083 align_up(jvmci_data_size, oopSize);
1084 }
1085
1086 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1087 int compile_id,
1088 CodeBuffer *code_buffer,
1089 int vep_offset,
1090 int frame_complete,
1091 int frame_size,
1092 ByteSize basic_lock_owner_sp_offset,
1093 ByteSize basic_lock_sp_offset,
1094 OopMapSet* oop_maps,
1095 int exception_handler) {
1096 code_buffer->finalize_oop_references(method);
1097 // create nmethod
1098 nmethod* nm = nullptr;
1099 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1100 {
1101 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1102
1103 CodeOffsets offsets;
1104 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1105 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1106 if (exception_handler != -1) {
1107 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1108 }
1109
1110 int mutable_data_size = required_mutable_data_size(code_buffer);
1111
1112 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1113 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1114 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1115 nm = new (native_nmethod_size, allow_NonNMethod_space)
1116 nmethod(method(), compiler_none, native_nmethod_size,
1117 compile_id, &offsets,
1118 code_buffer, frame_size,
1119 basic_lock_owner_sp_offset,
1120 basic_lock_sp_offset,
1121 oop_maps, mutable_data_size);
1122 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1123 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1124 }
1125
1126 if (nm != nullptr) {
1127 // verify nmethod
1128 debug_only(nm->verify();) // might block
1129
1130 nm->log_new_nmethod();
1131 }
1132 return nm;
1133 }
1134
1135 void nmethod::record_nmethod_dependency() {
1136 // To make dependency checking during class loading fast, record
1137 // the nmethod dependencies in the classes it is dependent on.
1138 // This allows the dependency checking code to simply walk the
1139 // class hierarchy above the loaded class, checking only nmethods
1140 // which are dependent on those classes. The slow way is to
1141 // check every nmethod for dependencies which makes it linear in
1142 // the number of methods compiled. For applications with a lot
1143 // classes the slow way is too slow.
1144 for (Dependencies::DepStream deps(this); deps.next(); ) {
1145 if (deps.type() == Dependencies::call_site_target_value) {
1146 // CallSite dependencies are managed on per-CallSite instance basis.
1147 oop call_site = deps.argument_oop(0);
1148 MethodHandles::add_dependent_nmethod(call_site, this);
1149 } else {
1150 InstanceKlass* ik = deps.context_type();
1151 if (ik == nullptr) {
1152 continue; // ignore things like evol_method
1153 }
1154 // record this nmethod as dependent on this klass
1155 ik->add_dependent_nmethod(this);
1156 }
1157 }
1158 }
1159
1160 nmethod* nmethod::new_nmethod(const methodHandle& method,
1161 int compile_id,
1162 int entry_bci,
1163 CodeOffsets* offsets,
1164 int orig_pc_offset,
1165 DebugInformationRecorder* debug_info,
1166 Dependencies* dependencies,
1167 CodeBuffer* code_buffer, int frame_size,
1168 OopMapSet* oop_maps,
1169 ExceptionHandlerTable* handler_table,
1170 ImplicitExceptionTable* nul_chk_table,
1171 AbstractCompiler* compiler,
1172 CompLevel comp_level
1173 , SCCEntry* scc_entry
1174 #if INCLUDE_JVMCI
1175 , char* speculations,
1176 int speculations_len,
1177 JVMCINMethodData* jvmci_data
1178 #endif
1179 )
1180 {
1181 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1182 code_buffer->finalize_oop_references(method);
1183 // create nmethod
1184 nmethod* nm = nullptr;
1185 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1186
1187 int immutable_data_size =
1188 adjust_pcs_size(debug_info->pcs_size())
1189 + align_up((int)dependencies->size_in_bytes(), oopSize)
1190 + align_up(handler_table->size_in_bytes() , oopSize)
1191 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1192 #if INCLUDE_JVMCI
1193 + align_up(speculations_len , oopSize)
1194 #endif
1195 + align_up(debug_info->data_size() , oopSize);
1196
1197 // First, allocate space for immutable data in C heap.
1198 address immutable_data = nullptr;
1199 if (immutable_data_size > 0) {
1200 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1201 if (immutable_data == nullptr) {
1202 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1203 return nullptr;
1204 }
1205 }
1206
1207 int mutable_data_size = required_mutable_data_size(code_buffer
1208 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1209
1210 {
1211 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1212
1213 nm = new (nmethod_size, comp_level)
1214 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1215 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1216 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1217 handler_table, nul_chk_table, compiler, comp_level, scc_entry
1218 #if INCLUDE_JVMCI
1219 , speculations,
1220 speculations_len,
1221 jvmci_data
1222 #endif
1223 );
1224
1225 if (nm != nullptr) {
1226 nm->record_nmethod_dependency();
1227 NOT_PRODUCT(note_java_nmethod(nm));
1228 }
1229 }
1230 // Do verification and logging outside CodeCache_lock.
1231 if (nm != nullptr) {
1232
1233 #ifdef ASSERT
1234 LogTarget(Debug, scc, nmethod) log;
1235 if (log.is_enabled()) {
1236 LogStream out(log);
1237 out.print_cr("== new_nmethod 2");
1238 FlagSetting fs(PrintRelocations, true);
1239 nm->print_on_impl(&out);
1240 nm->decode(&out);
1241 }
1242 #endif
1243
1244 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1245 DEBUG_ONLY(nm->verify();)
1246 nm->log_new_nmethod();
1247 }
1248 return nm;
1249 }
1250
1251 void nmethod::restore_from_archive(nmethod* archived_nm,
1252 const methodHandle& method,
1253 int compile_id,
1254 address reloc_data,
1255 GrowableArray<Handle>& oop_list,
1256 GrowableArray<Metadata*>& metadata_list,
1257 ImmutableOopMapSet* oop_maps,
1258 address immutable_data,
1259 GrowableArray<Handle>& reloc_imm_oop_list,
1260 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1261 #ifndef PRODUCT
1262 AsmRemarks& archived_asm_remarks,
1263 DbgStrings& archived_dbg_strings,
1264 #endif /* PRODUCT */
1265 SCCReader* scc_reader)
1266 {
1267 archived_nm->copy_to((address)this);
1268 set_name("nmethod");
1269 set_method(method());
1270
1271 _compile_id = compile_id;
1272 // allocate _mutable_data before copying relocation data because relocation data is now stored as part of mutable data area
1273 if (archived_nm->mutable_data_size() > 0) {
1274 _mutable_data = (address)os::malloc(archived_nm->mutable_data_size(), mtCode);
1275 if (_mutable_data == nullptr) {
1276 vm_exit_out_of_memory(archived_nm->mutable_data_size(), OOM_MALLOC_ERROR, "codebuffer: no space for mutable data");
1277 }
1278 }
1279 memcpy((address)relocation_begin(), reloc_data, archived_nm->relocation_size());
1280 set_oop_maps(oop_maps);
1281 set_immutable_data(immutable_data);
1282 copy_values(&oop_list);
1283 copy_values(&metadata_list);
1284
1285 scc_reader->apply_relocations(this, reloc_imm_oop_list, reloc_imm_metadata_list);
1286
1287 #ifndef PRODUCT
1288 AsmRemarks::init(asm_remarks());
1289 use_remarks(archived_asm_remarks);
1290 archived_asm_remarks.clear();
1291 DbgStrings::init(dbg_strings());
1292 use_strings(archived_dbg_strings);
1293 archived_dbg_strings.clear();
1294 #endif /* PRODUCT */
1295
1296 // Flush the code block
1297 ICache::invalidate_range(code_begin(), code_size());
1298
1299 // Create cache after PcDesc data is copied - it will be used to initialize cache
1300 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1301
1302 set_scc_entry(scc_reader->scc_entry());
1303
1304 post_init();
1305 }
1306
1307 nmethod* nmethod::new_nmethod(nmethod* archived_nm,
1308 const methodHandle& method,
1309 AbstractCompiler* compiler,
1310 int compile_id,
1311 address reloc_data,
1312 GrowableArray<Handle>& oop_list,
1313 GrowableArray<Metadata*>& metadata_list,
1314 ImmutableOopMapSet* oop_maps,
1315 address immutable_data,
1316 GrowableArray<Handle>& reloc_imm_oop_list,
1317 GrowableArray<Metadata*>& reloc_imm_metadata_list,
1318 #ifndef PRODUCT
1319 AsmRemarks& asm_remarks,
1320 DbgStrings& dbg_strings,
1321 #endif /* PRODUCT */
1322 SCCReader* scc_reader)
1323 {
1324 nmethod* nm = nullptr;
1325 int nmethod_size = archived_nm->size();
1326 // create nmethod
1327 {
1328 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1329 nm = (nmethod *)CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(archived_nm->comp_level()));
1330 if (nm != nullptr) {
1331 nm->restore_from_archive(archived_nm,
1332 method,
1333 compile_id,
1334 reloc_data,
1335 oop_list,
1336 metadata_list,
1337 oop_maps,
1338 immutable_data,
1339 reloc_imm_oop_list,
1340 reloc_imm_metadata_list,
1341 NOT_PRODUCT_ARG(asm_remarks)
1342 NOT_PRODUCT_ARG(dbg_strings)
1343 scc_reader);
1344 nm->record_nmethod_dependency();
1345 NOT_PRODUCT(note_java_nmethod(nm));
1346 }
1347 }
1348 // Do verification and logging outside CodeCache_lock.
1349 if (nm != nullptr) {
1350 #ifdef ASSERT
1351 LogTarget(Debug, scc, nmethod) log;
1352 if (log.is_enabled()) {
1353 LogStream out(log);
1354 out.print_cr("== new_nmethod 2");
1355 FlagSetting fs(PrintRelocations, true);
1356 nm->print_on_impl(&out);
1357 nm->decode(&out);
1358 }
1359 #endif
1360 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1361 DEBUG_ONLY(nm->verify();)
1362 nm->log_new_nmethod();
1363 }
1364 return nm;
1365 }
1366
1367 // Fill in default values for various fields
1368 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1369 // avoid uninitialized fields, even for short time periods
1370 _exception_cache = nullptr;
1371 _gc_data = nullptr;
1372 _oops_do_mark_link = nullptr;
1373 _compiled_ic_data = nullptr;
1374
1375 _is_unloading_state = 0;
1376 _state = not_installed;
1377
1378 _has_unsafe_access = 0;
1379 _has_method_handle_invokes = 0;
1380 _has_wide_vectors = 0;
1381 _has_monitors = 0;
1382 _has_scoped_access = 0;
1383 _has_flushed_dependencies = 0;
1384 _is_unlinked = 0;
1385 _load_reported = 0; // jvmti state
1386 _preloaded = 0;
1387 _has_clinit_barriers = 0;
1388
1389 _used = false;
1390 _deoptimization_status = not_marked;
1391
1392 // SECT_CONSTS is first in code buffer so the offset should be 0.
1393 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1394 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1395
1396 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1397
1398 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1399 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1400
1401 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1402 }
1403
1404 // Post initialization
1405 void nmethod::post_init() {
1406 clear_unloading_state();
1407
1408 finalize_relocations();
1409
1410 Universe::heap()->register_nmethod(this);
1411 debug_only(Universe::heap()->verify_nmethod(this));
1412
1413 CodeCache::commit(this);
1414 }
1415
1416 // For native wrappers
1417 nmethod::nmethod(
1418 Method* method,
1419 CompilerType type,
1420 int nmethod_size,
1421 int compile_id,
1422 CodeOffsets* offsets,
1423 CodeBuffer* code_buffer,
1424 int frame_size,
1425 ByteSize basic_lock_owner_sp_offset,
1426 ByteSize basic_lock_sp_offset,
1427 OopMapSet* oop_maps,
1428 int mutable_data_size)
1429 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1430 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1431 _deoptimization_generation(0),
1432 _gc_epoch(CodeCache::gc_epoch()),
1433 _method(method),
1434 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1435 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1436 {
1437 {
1438 debug_only(NoSafepointVerifier nsv;)
1439 assert_locked_or_safepoint(CodeCache_lock);
1440
1441 init_defaults(code_buffer, offsets);
1442
1443 _osr_entry_point = nullptr;
1444 _pc_desc_container = nullptr;
1445 _entry_bci = InvocationEntryBci;
1446 _compile_id = compile_id;
1447 _comp_level = CompLevel_none;
1448 _compiler_type = type;
1449 _orig_pc_offset = 0;
1450 _num_stack_arg_slots = 0;
1451
1452 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1453 // Continuation enter intrinsic
1454 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1455 } else {
1456 _exception_offset = 0;
1457 }
1458 // Native wrappers do not have deopt handlers. Make the values
1459 // something that will never match a pc like the nmethod vtable entry
1460 _deopt_handler_offset = 0;
1461 _deopt_mh_handler_offset = 0;
1462 _scc_entry = nullptr;
1463 _method_profiling_count = 0;
1464 _unwind_handler_offset = 0;
1465
1466 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1467 int metadata_size = align_up(code_buffer->total_metadata_size(), wordSize);
1468 JVMCI_ONLY( _jvmci_data_size = 0; )
1469 assert(_mutable_data_size == _relocation_size + metadata_size,
1470 "wrong mutable data size: %d != %d + %d",
1471 _mutable_data_size, _relocation_size, metadata_size);
1472
1473 // native wrapper does not have read-only data but we need unique not null address
1474 _immutable_data = blob_end();
1475 _immutable_data_size = 0;
1476 _nul_chk_table_offset = 0;
1477 _handler_table_offset = 0;
1478 _scopes_pcs_offset = 0;
1479 _scopes_data_offset = 0;
1480 #if INCLUDE_JVMCI
1481 _speculations_offset = 0;
1482 #endif
1483
1484 code_buffer->copy_code_and_locs_to(this);
1485 code_buffer->copy_values_to(this);
1486
1487 post_init();
1488 }
1489
1490 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1491 ttyLocker ttyl; // keep the following output all in one block
1492 // This output goes directly to the tty, not the compiler log.
1493 // To enable tools to match it up with the compilation activity,
1494 // be sure to tag this tty output with the compile ID.
1495 if (xtty != nullptr) {
1496 xtty->begin_head("print_native_nmethod");
1497 xtty->method(_method);
1498 xtty->stamp();
1499 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1500 }
1501 // Print the header part, then print the requested information.
1502 // This is both handled in decode2(), called via print_code() -> decode()
1503 if (PrintNativeNMethods) {
1504 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1505 print_code();
1506 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1507 #if defined(SUPPORT_DATA_STRUCTS)
1508 if (AbstractDisassembler::show_structs()) {
1509 if (oop_maps != nullptr) {
1510 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1511 oop_maps->print_on(tty);
1512 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1513 }
1514 }
1515 #endif
1516 } else {
1517 print(); // print the header part only.
1518 }
1519 #if defined(SUPPORT_DATA_STRUCTS)
1520 if (AbstractDisassembler::show_structs()) {
1521 if (PrintRelocations) {
1522 print_relocations_on(tty);
1523 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1524 }
1525 }
1526 #endif
1527 if (xtty != nullptr) {
1528 xtty->tail("print_native_nmethod");
1529 }
1530 }
1531 }
1532
1533 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1534 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1535 }
1536
1537 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1538 // Try MethodNonProfiled and MethodProfiled.
1539 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1540 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1541 // Try NonNMethod or give up.
1542 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1543 }
1544
1545 // For normal JIT compiled code
1546 nmethod::nmethod(
1547 Method* method,
1548 CompilerType type,
1549 int nmethod_size,
1550 int immutable_data_size,
1551 int mutable_data_size,
1552 int compile_id,
1553 int entry_bci,
1554 address immutable_data,
1555 CodeOffsets* offsets,
1556 int orig_pc_offset,
1557 DebugInformationRecorder* debug_info,
1558 Dependencies* dependencies,
1559 CodeBuffer *code_buffer,
1560 int frame_size,
1561 OopMapSet* oop_maps,
1562 ExceptionHandlerTable* handler_table,
1563 ImplicitExceptionTable* nul_chk_table,
1564 AbstractCompiler* compiler,
1565 CompLevel comp_level
1566 , SCCEntry* scc_entry
1567 #if INCLUDE_JVMCI
1568 , char* speculations,
1569 int speculations_len,
1570 JVMCINMethodData* jvmci_data
1571 #endif
1572 )
1573 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1574 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1575 _deoptimization_generation(0),
1576 _gc_epoch(CodeCache::gc_epoch()),
1577 _method(method),
1578 _osr_link(nullptr)
1579 {
1580 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1581 {
1582 debug_only(NoSafepointVerifier nsv;)
1583 assert_locked_or_safepoint(CodeCache_lock);
1584
1585 init_defaults(code_buffer, offsets);
1586 _scc_entry = scc_entry;
1587 _method_profiling_count = 0;
1588
1589 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1590 _entry_bci = entry_bci;
1591 _compile_id = compile_id;
1592 _comp_level = comp_level;
1593 _compiler_type = type;
1594 _orig_pc_offset = orig_pc_offset;
1595
1596 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1597
1598 set_ctable_begin(header_begin() + content_offset());
1599
1600 #if INCLUDE_JVMCI
1601 if (compiler->is_jvmci()) {
1602 // JVMCI might not produce any stub sections
1603 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1604 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1605 } else {
1606 _exception_offset = -1;
1607 }
1608 if (offsets->value(CodeOffsets::Deopt) != -1) {
1609 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1610 } else {
1611 _deopt_handler_offset = -1;
1612 }
1613 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1614 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH);
1615 } else {
1616 _deopt_mh_handler_offset = -1;
1617 }
1618 } else
1619 #endif
1620 {
1621 // Exception handler and deopt handler are in the stub section
1622 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1623 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1624
1625 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1626 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1627 if (offsets->value(CodeOffsets::DeoptMH) != -1) {
1628 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH);
1629 } else {
1630 _deopt_mh_handler_offset = -1;
1631 }
1632 }
1633 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1634 // C1 generates UnwindHandler at the end of instructions section.
1635 // Calculate positive offset as distance between the start of stubs section
1636 // (which is also the end of instructions section) and the start of the handler.
1637 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1638 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1639 } else {
1640 _unwind_handler_offset = -1;
1641 }
1642
1643 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1644 uint16_t metadata_size = (uint16_t)align_up(code_buffer->total_metadata_size(), wordSize);
1645 JVMCI_ONLY(CHECKED_CAST(_jvmci_data_size, uint16_t, align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize)));
1646 int jvmci_data_size = 0 JVMCI_ONLY(+ _jvmci_data_size);
1647 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1648 "wrong mutable data size: %d != %d + %d + %d",
1649 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1650 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1651 nmethod_size, (int)(code_end() - header_begin()));
1652
1653 _immutable_data_size = immutable_data_size;
1654 if (immutable_data_size > 0) {
1655 assert(immutable_data != nullptr, "required");
1656 _immutable_data = immutable_data;
1657 } else {
1658 // We need unique not null address
1659 _immutable_data = blob_end();
1660 }
1661 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1662 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1663 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1664 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1665
1666 #if INCLUDE_JVMCI
1667 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1668 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); )
1669 #else
1670 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); )
1671 #endif
1672 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1673 immutable_data_end_offset, immutable_data_size);
1674
1675 // Copy code and relocation info
1676 code_buffer->copy_code_and_locs_to(this);
1677 // Copy oops and metadata
1678 code_buffer->copy_values_to(this);
1679 dependencies->copy_to(this);
1680 // Copy PcDesc and ScopeDesc data
1681 debug_info->copy_to(this);
1682
1683 // Create cache after PcDesc data is copied - it will be used to initialize cache
1684 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1685
1686 #if INCLUDE_JVMCI
1687 if (compiler->is_jvmci()) {
1688 // Initialize the JVMCINMethodData object inlined into nm
1689 jvmci_nmethod_data()->copy(jvmci_data);
1690 }
1691 #endif
1692
1693 // Copy contents of ExceptionHandlerTable to nmethod
1694 handler_table->copy_to(this);
1695 nul_chk_table->copy_to(this);
1696
1697 #if INCLUDE_JVMCI
1698 // Copy speculations to nmethod
1699 if (speculations_size() != 0) {
1700 memcpy(speculations_begin(), speculations, speculations_len);
1701 }
1702 #endif
1703
1704 post_init();
1705
1706 // we use the information of entry points to find out if a method is
1707 // static or non static
1708 assert(compiler->is_c2() || compiler->is_jvmci() ||
1709 _method->is_static() == (entry_point() == verified_entry_point()),
1710 " entry points must be same for static methods and vice versa");
1711 }
1712 }
1713
1714 // Print a short set of xml attributes to identify this nmethod. The
1715 // output should be embedded in some other element.
1716 void nmethod::log_identity(xmlStream* log) const {
1717 assert(log->inside_attrs_or_error(), "printing attributes");
1718 log->print(" code_compile_id='%d'", compile_id());
1719 const char* nm_kind = compile_kind();
1720 if (nm_kind != nullptr) log->print(" code_compile_kind='%s'", nm_kind);
1721 log->print(" code_compiler='%s'", compiler_name());
1722 if (TieredCompilation) {
1723 log->print(" code_compile_level='%d'", comp_level());
1724 }
1725 #if INCLUDE_JVMCI
1726 if (jvmci_nmethod_data() != nullptr) {
1727 const char* jvmci_name = jvmci_nmethod_data()->name();
1728 if (jvmci_name != nullptr) {
1729 log->print(" jvmci_mirror_name='");
1730 log->text("%s", jvmci_name);
1731 log->print("'");
1732 }
1733 }
1734 #endif
1735 }
1736
1737
1738 #define LOG_OFFSET(log, name) \
1739 if (p2i(name##_end()) - p2i(name##_begin())) \
1740 log->print(" " XSTR(name) "_offset='%zd'" , \
1741 p2i(name##_begin()) - p2i(this))
1742
1743
1744 void nmethod::log_new_nmethod() const {
1745 if (LogCompilation && xtty != nullptr) {
1746 ttyLocker ttyl;
1747 xtty->begin_elem("nmethod");
1748 log_identity(xtty);
1749 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1750 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1751
1752 LOG_OFFSET(xtty, relocation);
1753 LOG_OFFSET(xtty, consts);
1754 LOG_OFFSET(xtty, insts);
1755 LOG_OFFSET(xtty, stub);
1756 LOG_OFFSET(xtty, scopes_data);
1757 LOG_OFFSET(xtty, scopes_pcs);
1758 LOG_OFFSET(xtty, dependencies);
1759 LOG_OFFSET(xtty, handler_table);
1760 LOG_OFFSET(xtty, nul_chk_table);
1761 LOG_OFFSET(xtty, oops);
1762 LOG_OFFSET(xtty, metadata);
1763
1764 xtty->method(method());
1765 xtty->stamp();
1766 xtty->end_elem();
1767 }
1768 }
1769
1770 #undef LOG_OFFSET
1771
1772
1773 // Print out more verbose output usually for a newly created nmethod.
1774 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1775 if (st != nullptr) {
1776 ttyLocker ttyl;
1777 if (WizardMode) {
1778 CompileTask::print(st, this, msg, /*short_form:*/ true);
1779 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1780 } else {
1781 CompileTask::print(st, this, msg, /*short_form:*/ false);
1782 }
1783 }
1784 }
1785
1786 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1787 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1788 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1789 print_nmethod(printnmethods);
1790 }
1791 }
1792
1793 void nmethod::print_nmethod(bool printmethod) {
1794 ttyLocker ttyl; // keep the following output all in one block
1795 if (xtty != nullptr) {
1796 xtty->begin_head("print_nmethod");
1797 log_identity(xtty);
1798 xtty->stamp();
1799 xtty->end_head();
1800 }
1801 // Print the header part, then print the requested information.
1802 // This is both handled in decode2().
1803 if (printmethod) {
1804 ResourceMark m;
1805 if (is_compiled_by_c1()) {
1806 tty->cr();
1807 tty->print_cr("============================= C1-compiled nmethod ==============================");
1808 }
1809 if (is_compiled_by_jvmci()) {
1810 tty->cr();
1811 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1812 }
1813 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1814 decode2(tty);
1815 #if defined(SUPPORT_DATA_STRUCTS)
1816 if (AbstractDisassembler::show_structs()) {
1817 // Print the oops from the underlying CodeBlob as well.
1818 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1819 print_oops(tty);
1820 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1821 print_metadata(tty);
1822 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1823 print_pcs_on(tty);
1824 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1825 if (oop_maps() != nullptr) {
1826 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1827 oop_maps()->print_on(tty);
1828 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1829 }
1830 }
1831 #endif
1832 } else {
1833 print(); // print the header part only.
1834 }
1835
1836 #if defined(SUPPORT_DATA_STRUCTS)
1837 if (AbstractDisassembler::show_structs()) {
1838 methodHandle mh(Thread::current(), _method);
1839 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1840 print_scopes();
1841 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1842 }
1843 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1844 print_relocations_on(tty);
1845 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1846 }
1847 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1848 print_dependencies_on(tty);
1849 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1850 }
1851 if (printmethod || PrintExceptionHandlers) {
1852 print_handler_table();
1853 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1854 print_nul_chk_table();
1855 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1856 }
1857
1858 if (printmethod) {
1859 print_recorded_oops();
1860 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1861 print_recorded_metadata();
1862 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1863 }
1864 }
1865 #endif
1866
1867 if (xtty != nullptr) {
1868 xtty->tail("print_nmethod");
1869 }
1870 }
1871
1872
1873 // Promote one word from an assembly-time handle to a live embedded oop.
1874 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
1875 if (handle == nullptr ||
1876 // As a special case, IC oops are initialized to 1 or -1.
1877 handle == (jobject) Universe::non_oop_word()) {
1878 *(void**)dest = handle;
1879 } else {
1880 *dest = JNIHandles::resolve_non_null(handle);
1881 }
1882 }
1883
1884 void nmethod::copy_values(GrowableArray<Handle>* array) {
1885 int length = array->length();
1886 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1887 oop* dest = oops_begin();
1888 for (int index = 0 ; index < length; index++) {
1889 dest[index] = array->at(index)();
1890 }
1891 }
1892
1893 // Have to have the same name because it's called by a template
1894 void nmethod::copy_values(GrowableArray<jobject>* array) {
1895 int length = array->length();
1896 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
1897 oop* dest = oops_begin();
1898 for (int index = 0 ; index < length; index++) {
1899 initialize_immediate_oop(&dest[index], array->at(index));
1900 }
1901
1902 // Now we can fix up all the oops in the code. We need to do this
1903 // in the code because the assembler uses jobjects as placeholders.
1904 // The code and relocations have already been initialized by the
1905 // CodeBlob constructor, so it is valid even at this early point to
1906 // iterate over relocations and patch the code.
1907 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
1908 }
1909
1910 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
1911 int length = array->length();
1912 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
1913 Metadata** dest = metadata_begin();
1914 for (int index = 0 ; index < length; index++) {
1915 dest[index] = array->at(index);
1916 }
1917 }
1918
1919 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
1920 // re-patch all oop-bearing instructions, just in case some oops moved
1921 RelocIterator iter(this, begin, end);
1922 while (iter.next()) {
1923 if (iter.type() == relocInfo::oop_type) {
1924 oop_Relocation* reloc = iter.oop_reloc();
1925 if (initialize_immediates && reloc->oop_is_immediate()) {
1926 oop* dest = reloc->oop_addr();
1927 jobject obj = *reinterpret_cast<jobject*>(dest);
1928 initialize_immediate_oop(dest, obj);
1929 }
1930 // Refresh the oop-related bits of this instruction.
1931 reloc->fix_oop_relocation();
1932 } else if (iter.type() == relocInfo::metadata_type) {
1933 metadata_Relocation* reloc = iter.metadata_reloc();
1934 reloc->fix_metadata_relocation();
1935 }
1936 }
1937 }
1938
1939 void nmethod::create_reloc_immediates_list(JavaThread* thread, GrowableArray<Handle>& oop_list, GrowableArray<Metadata*>& metadata_list) {
1940 RelocIterator iter(this);
1941 while (iter.next()) {
1942 if (iter.type() == relocInfo::oop_type) {
1943 oop_Relocation* reloc = iter.oop_reloc();
1944 if (reloc->oop_is_immediate()) {
1945 oop dest = reloc->oop_value();
1946 Handle h(thread, dest);
1947 oop_list.append(h);
1948 }
1949 } else if (iter.type() == relocInfo::metadata_type) {
1950 metadata_Relocation* reloc = iter.metadata_reloc();
1951 if (reloc->metadata_is_immediate()) {
1952 Metadata* m = reloc->metadata_value();
1953 metadata_list.append(m);
1954 }
1955 }
1956 }
1957 }
1958
1959 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
1960 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
1961 intptr_t cbaddr = (intptr_t) nm;
1962 intptr_t offset = ((intptr_t) pc) - cbaddr;
1963
1964 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
1965 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
1966 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
1967 } else if (!nop->patch(oopmap_slot, offset)) {
1968 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
1969 }
1970 }
1971
1972 void nmethod::finalize_relocations() {
1973 NoSafepointVerifier nsv;
1974
1975 GrowableArray<NativeMovConstReg*> virtual_call_data;
1976
1977 // Make sure that post call nops fill in nmethod offsets eagerly so
1978 // we don't have to race with deoptimization
1979 RelocIterator iter(this);
1980 while (iter.next()) {
1981 if (iter.type() == relocInfo::virtual_call_type) {
1982 virtual_call_Relocation* r = iter.virtual_call_reloc();
1983 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
1984 virtual_call_data.append(value);
1985 } else if (iter.type() == relocInfo::post_call_nop_type) {
1986 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
1987 address pc = reloc->addr();
1988 install_post_call_nop_displacement(this, pc);
1989 }
1990 }
1991
1992 if (virtual_call_data.length() > 0) {
1993 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
1994 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
1995 CompiledICData* next_data = _compiled_ic_data;
1996
1997 for (NativeMovConstReg* value : virtual_call_data) {
1998 value->set_data((intptr_t)next_data);
1999 next_data++;
2000 }
2001 }
2002 }
2003
2004 void nmethod::make_deoptimized() {
2005 if (!Continuations::enabled()) {
2006 // Don't deopt this again.
2007 set_deoptimized_done();
2008 return;
2009 }
2010
2011 assert(method() == nullptr || can_be_deoptimized(), "");
2012
2013 CompiledICLocker ml(this);
2014 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2015
2016 // If post call nops have been already patched, we can just bail-out.
2017 if (has_been_deoptimized()) {
2018 return;
2019 }
2020
2021 ResourceMark rm;
2022 RelocIterator iter(this, oops_reloc_begin());
2023
2024 while (iter.next()) {
2025
2026 switch (iter.type()) {
2027 case relocInfo::virtual_call_type: {
2028 CompiledIC *ic = CompiledIC_at(&iter);
2029 address pc = ic->end_of_call();
2030 NativePostCallNop* nop = nativePostCallNop_at(pc);
2031 if (nop != nullptr) {
2032 nop->make_deopt();
2033 }
2034 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2035 break;
2036 }
2037 case relocInfo::static_call_type:
2038 case relocInfo::opt_virtual_call_type: {
2039 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2040 address pc = csc->end_of_call();
2041 NativePostCallNop* nop = nativePostCallNop_at(pc);
2042 //tty->print_cr(" - static pc %p", pc);
2043 if (nop != nullptr) {
2044 nop->make_deopt();
2045 }
2046 // We can't assert here, there are some calls to stubs / runtime
2047 // that have reloc data and doesn't have a post call NOP.
2048 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2049 break;
2050 }
2051 default:
2052 break;
2053 }
2054 }
2055 // Don't deopt this again.
2056 set_deoptimized_done();
2057 }
2058
2059 void nmethod::verify_clean_inline_caches() {
2060 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2061
2062 ResourceMark rm;
2063 RelocIterator iter(this, oops_reloc_begin());
2064 while(iter.next()) {
2065 switch(iter.type()) {
2066 case relocInfo::virtual_call_type: {
2067 CompiledIC *ic = CompiledIC_at(&iter);
2068 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2069 assert(cb != nullptr, "destination not in CodeBlob?");
2070 nmethod* nm = cb->as_nmethod_or_null();
2071 if (nm != nullptr) {
2072 // Verify that inline caches pointing to bad nmethods are clean
2073 if (!nm->is_in_use() || nm->is_unloading()) {
2074 assert(ic->is_clean(), "IC should be clean");
2075 }
2076 }
2077 break;
2078 }
2079 case relocInfo::static_call_type:
2080 case relocInfo::opt_virtual_call_type: {
2081 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2082 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2083 assert(cb != nullptr, "destination not in CodeBlob?");
2084 nmethod* nm = cb->as_nmethod_or_null();
2085 if (nm != nullptr) {
2086 // Verify that inline caches pointing to bad nmethods are clean
2087 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2088 assert(cdc->is_clean(), "IC should be clean");
2089 }
2090 }
2091 break;
2092 }
2093 default:
2094 break;
2095 }
2096 }
2097 }
2098
2099 void nmethod::mark_as_maybe_on_stack() {
2100 Atomic::store(&_gc_epoch, CodeCache::gc_epoch());
2101 }
2102
2103 bool nmethod::is_maybe_on_stack() {
2104 // If the condition below is true, it means that the nmethod was found to
2105 // be alive the previous completed marking cycle.
2106 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2107 }
2108
2109 void nmethod::inc_decompile_count() {
2110 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2111 // Could be gated by ProfileTraps, but do not bother...
2112 Method* m = method();
2113 if (m == nullptr) return;
2114 MethodData* mdo = m->method_data();
2115 if (mdo == nullptr) return;
2116 // There is a benign race here. See comments in methodData.hpp.
2117 mdo->inc_decompile_count();
2118 }
2119
2120 void nmethod::inc_method_profiling_count() {
2121 Atomic::inc(&_method_profiling_count);
2122 }
2123
2124 uint64_t nmethod::method_profiling_count() {
2125 return _method_profiling_count;
2126 }
2127
2128 bool nmethod::try_transition(signed char new_state_int) {
2129 signed char new_state = new_state_int;
2130 assert_lock_strong(NMethodState_lock);
2131 signed char old_state = _state;
2132 if (old_state >= new_state) {
2133 // Ensure monotonicity of transitions.
2134 return false;
2135 }
2136 Atomic::store(&_state, new_state);
2137 return true;
2138 }
2139
2140 void nmethod::invalidate_osr_method() {
2141 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2142 // Remove from list of active nmethods
2143 if (method() != nullptr) {
2144 method()->method_holder()->remove_osr_nmethod(this);
2145 }
2146 }
2147
2148 void nmethod::log_state_change(const char* reason) const {
2149 assert(reason != nullptr, "Must provide a reason");
2150
2151 if (LogCompilation) {
2152 if (xtty != nullptr) {
2153 ttyLocker ttyl; // keep the following output all in one block
2154 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2155 os::current_thread_id(), reason);
2156 log_identity(xtty);
2157 xtty->stamp();
2158 xtty->end_elem();
2159 }
2160 }
2161
2162 ResourceMark rm;
2163 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2164 ss.print("made not entrant: %s", reason);
2165
2166 CompileTask::print_ul(this, ss.freeze());
2167 if (PrintCompilation) {
2168 print_on_with_msg(tty, ss.freeze());
2169 }
2170 }
2171
2172 void nmethod::unlink_from_method() {
2173 if (method() != nullptr) {
2174 method()->unlink_code(this);
2175 }
2176 }
2177
2178 // Invalidate code
2179 bool nmethod::make_not_entrant(const char* reason, bool make_not_entrant) {
2180 assert(reason != nullptr, "Must provide a reason");
2181
2182 // This can be called while the system is already at a safepoint which is ok
2183 NoSafepointVerifier nsv;
2184
2185 if (is_unloading()) {
2186 // If the nmethod is unloading, then it is already not entrant through
2187 // the nmethod entry barriers. No need to do anything; GC will unload it.
2188 return false;
2189 }
2190
2191 if (Atomic::load(&_state) == not_entrant) {
2192 // Avoid taking the lock if already in required state.
2193 // This is safe from races because the state is an end-state,
2194 // which the nmethod cannot back out of once entered.
2195 // No need for fencing either.
2196 return false;
2197 }
2198
2199 {
2200 // Enter critical section. Does not block for safepoint.
2201 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2202
2203 if (Atomic::load(&_state) == not_entrant) {
2204 // another thread already performed this transition so nothing
2205 // to do, but return false to indicate this.
2206 return false;
2207 }
2208
2209 if (is_osr_method()) {
2210 // This logic is equivalent to the logic below for patching the
2211 // verified entry point of regular methods.
2212 // this effectively makes the osr nmethod not entrant
2213 invalidate_osr_method();
2214 } else {
2215 // The caller can be calling the method statically or through an inline
2216 // cache call.
2217 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
2218 SharedRuntime::get_handle_wrong_method_stub());
2219 }
2220
2221 if (update_recompile_counts()) {
2222 // Mark the method as decompiled.
2223 inc_decompile_count();
2224 }
2225
2226 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2227 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2228 // If nmethod entry barriers are not supported, we won't mark
2229 // nmethods as on-stack when they become on-stack. So we
2230 // degrade to a less accurate flushing strategy, for now.
2231 mark_as_maybe_on_stack();
2232 }
2233
2234 // Change state
2235 bool success = try_transition(not_entrant);
2236 assert(success, "Transition can't fail");
2237
2238 // Log the transition once
2239 log_state_change(reason);
2240
2241 // Remove nmethod from method.
2242 unlink_from_method();
2243
2244 if (make_not_entrant) {
2245 // Keep cached code if it was simply replaced
2246 // otherwise make it not entrant too.
2247 SCCache::invalidate(_scc_entry);
2248 }
2249
2250 CompileBroker::log_not_entrant(this);
2251 } // leave critical region under NMethodState_lock
2252
2253 #if INCLUDE_JVMCI
2254 // Invalidate can't occur while holding the NMethodState_lock
2255 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2256 if (nmethod_data != nullptr) {
2257 nmethod_data->invalidate_nmethod_mirror(this);
2258 }
2259 #endif
2260
2261 #ifdef ASSERT
2262 if (is_osr_method() && method() != nullptr) {
2263 // Make sure osr nmethod is invalidated, i.e. not on the list
2264 bool found = method()->method_holder()->remove_osr_nmethod(this);
2265 assert(!found, "osr nmethod should have been invalidated");
2266 }
2267 #endif
2268
2269 return true;
2270 }
2271
2272 // For concurrent GCs, there must be a handshake between unlink and flush
2273 void nmethod::unlink() {
2274 if (is_unlinked()) {
2275 // Already unlinked.
2276 return;
2277 }
2278
2279 flush_dependencies();
2280
2281 // unlink_from_method will take the NMethodState_lock.
2282 // In this case we don't strictly need it when unlinking nmethods from
2283 // the Method, because it is only concurrently unlinked by
2284 // the entry barrier, which acquires the per nmethod lock.
2285 unlink_from_method();
2286
2287 if (is_osr_method()) {
2288 invalidate_osr_method();
2289 }
2290
2291 #if INCLUDE_JVMCI
2292 // Clear the link between this nmethod and a HotSpotNmethod mirror
2293 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2294 if (nmethod_data != nullptr) {
2295 nmethod_data->invalidate_nmethod_mirror(this);
2296 }
2297 #endif
2298
2299 // Post before flushing as jmethodID is being used
2300 post_compiled_method_unload();
2301
2302 // Register for flushing when it is safe. For concurrent class unloading,
2303 // that would be after the unloading handshake, and for STW class unloading
2304 // that would be when getting back to the VM thread.
2305 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2306 }
2307
2308 void nmethod::purge(bool unregister_nmethod) {
2309
2310 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2311
2312 // completely deallocate this method
2313 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2314 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT
2315 "/Free CodeCache:%zuKb",
2316 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(),
2317 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024);
2318
2319 // We need to deallocate any ExceptionCache data.
2320 // Note that we do not need to grab the nmethod lock for this, it
2321 // better be thread safe if we're disposing of it!
2322 ExceptionCache* ec = exception_cache();
2323 while(ec != nullptr) {
2324 ExceptionCache* next = ec->next();
2325 delete ec;
2326 ec = next;
2327 }
2328 if (_pc_desc_container != nullptr) {
2329 delete _pc_desc_container;
2330 }
2331 if (_compiled_ic_data != nullptr) {
2332 delete[] _compiled_ic_data;
2333 }
2334
2335 if (_immutable_data != data_end() && !SCCache::is_address_in_aot_cache((address)_oop_maps)) {
2336 os::free(_immutable_data);
2337 _immutable_data = blob_end(); // Valid not null address
2338 }
2339 if (unregister_nmethod) {
2340 Universe::heap()->unregister_nmethod(this);
2341 }
2342 CodeCache::unregister_old_nmethod(this);
2343
2344 CodeBlob::purge();
2345 }
2346
2347 oop nmethod::oop_at(int index) const {
2348 if (index == 0) {
2349 return nullptr;
2350 }
2351
2352 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2353 return bs_nm->oop_load_no_keepalive(this, index);
2354 }
2355
2356 oop nmethod::oop_at_phantom(int index) const {
2357 if (index == 0) {
2358 return nullptr;
2359 }
2360
2361 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2362 return bs_nm->oop_load_phantom(this, index);
2363 }
2364
2365 //
2366 // Notify all classes this nmethod is dependent on that it is no
2367 // longer dependent.
2368
2369 void nmethod::flush_dependencies() {
2370 if (!has_flushed_dependencies()) {
2371 set_has_flushed_dependencies(true);
2372 for (Dependencies::DepStream deps(this); deps.next(); ) {
2373 if (deps.type() == Dependencies::call_site_target_value) {
2374 // CallSite dependencies are managed on per-CallSite instance basis.
2375 oop call_site = deps.argument_oop(0);
2376 MethodHandles::clean_dependency_context(call_site);
2377 } else {
2378 InstanceKlass* ik = deps.context_type();
2379 if (ik == nullptr) {
2380 continue; // ignore things like evol_method
2381 }
2382 // During GC liveness of dependee determines class that needs to be updated.
2383 // The GC may clean dependency contexts concurrently and in parallel.
2384 ik->clean_dependency_context();
2385 }
2386 }
2387 }
2388 }
2389
2390 void nmethod::post_compiled_method(CompileTask* task) {
2391 task->mark_success();
2392 task->set_nm_content_size(content_size());
2393 task->set_nm_insts_size(insts_size());
2394 task->set_nm_total_size(total_size());
2395
2396 // task->is_scc() is true only for loaded cached code.
2397 // nmethod::_scc_entry is set for loaded and stored cached code
2398 // to invalidate the entry when nmethod is deoptimized.
2399 // There is option to not store in archive cached code.
2400 guarantee((_scc_entry != nullptr) || !task->is_scc() || VerifyCachedCode, "sanity");
2401
2402 // JVMTI -- compiled method notification (must be done outside lock)
2403 post_compiled_method_load_event();
2404
2405 if (CompilationLog::log() != nullptr) {
2406 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2407 }
2408
2409 const DirectiveSet* directive = task->directive();
2410 maybe_print_nmethod(directive);
2411 }
2412
2413 // ------------------------------------------------------------------
2414 // post_compiled_method_load_event
2415 // new method for install_code() path
2416 // Transfer information from compilation to jvmti
2417 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2418 // This is a bad time for a safepoint. We don't want
2419 // this nmethod to get unloaded while we're queueing the event.
2420 NoSafepointVerifier nsv;
2421
2422 Method* m = method();
2423 HOTSPOT_COMPILED_METHOD_LOAD(
2424 (char *) m->klass_name()->bytes(),
2425 m->klass_name()->utf8_length(),
2426 (char *) m->name()->bytes(),
2427 m->name()->utf8_length(),
2428 (char *) m->signature()->bytes(),
2429 m->signature()->utf8_length(),
2430 insts_begin(), insts_size());
2431
2432
2433 if (JvmtiExport::should_post_compiled_method_load()) {
2434 // Only post unload events if load events are found.
2435 set_load_reported();
2436 // If a JavaThread hasn't been passed in, let the Service thread
2437 // (which is a real Java thread) post the event
2438 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2439 if (state == nullptr) {
2440 // Execute any barrier code for this nmethod as if it's called, since
2441 // keeping it alive looks like stack walking.
2442 run_nmethod_entry_barrier();
2443 ServiceThread::enqueue_deferred_event(&event);
2444 } else {
2445 // This enters the nmethod barrier outside in the caller.
2446 state->enqueue_event(&event);
2447 }
2448 }
2449 }
2450
2451 void nmethod::post_compiled_method_unload() {
2452 assert(_method != nullptr, "just checking");
2453 DTRACE_METHOD_UNLOAD_PROBE(method());
2454
2455 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2456 // post the event. The Method* will not be valid when this is freed.
2457
2458 // Don't bother posting the unload if the load event wasn't posted.
2459 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2460 JvmtiDeferredEvent event =
2461 JvmtiDeferredEvent::compiled_method_unload_event(
2462 method()->jmethod_id(), insts_begin());
2463 ServiceThread::enqueue_deferred_event(&event);
2464 }
2465 }
2466
2467 // Iterate over metadata calling this function. Used by RedefineClasses
2468 void nmethod::metadata_do(MetadataClosure* f) {
2469 {
2470 // Visit all immediate references that are embedded in the instruction stream.
2471 RelocIterator iter(this, oops_reloc_begin());
2472 while (iter.next()) {
2473 if (iter.type() == relocInfo::metadata_type) {
2474 metadata_Relocation* r = iter.metadata_reloc();
2475 // In this metadata, we must only follow those metadatas directly embedded in
2476 // the code. Other metadatas (oop_index>0) are seen as part of
2477 // the metadata section below.
2478 assert(1 == (r->metadata_is_immediate()) +
2479 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2480 "metadata must be found in exactly one place");
2481 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2482 Metadata* md = r->metadata_value();
2483 if (md != _method) f->do_metadata(md);
2484 }
2485 } else if (iter.type() == relocInfo::virtual_call_type) {
2486 // Check compiledIC holders associated with this nmethod
2487 ResourceMark rm;
2488 CompiledIC *ic = CompiledIC_at(&iter);
2489 ic->metadata_do(f);
2490 }
2491 }
2492 }
2493
2494 // Visit the metadata section
2495 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2496 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2497 Metadata* md = *p;
2498 f->do_metadata(md);
2499 }
2500
2501 // Visit metadata not embedded in the other places.
2502 if (_method != nullptr) f->do_metadata(_method);
2503 }
2504
2505 // Heuristic for nuking nmethods even though their oops are live.
2506 // Main purpose is to reduce code cache pressure and get rid of
2507 // nmethods that don't seem to be all that relevant any longer.
2508 bool nmethod::is_cold() {
2509 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2510 // No heuristic unloading at all
2511 return false;
2512 }
2513
2514 if (!is_maybe_on_stack() && is_not_entrant()) {
2515 // Not entrant nmethods that are not on any stack can just
2516 // be removed
2517 return true;
2518 }
2519
2520 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2521 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2522 // On platforms that don't support nmethod entry barriers, we can't
2523 // trust the temporal aspect of the gc epochs. So we can't detect
2524 // cold nmethods on such platforms.
2525 return false;
2526 }
2527
2528 if (!UseCodeCacheFlushing) {
2529 // Bail out if we don't heuristically remove nmethods
2530 return false;
2531 }
2532
2533 // Other code can be phased out more gradually after N GCs
2534 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2535 }
2536
2537 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2538 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2539 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2540 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2541 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2542
2543 class IsUnloadingState: public AllStatic {
2544 static const uint8_t _is_unloading_mask = 1;
2545 static const uint8_t _is_unloading_shift = 0;
2546 static const uint8_t _unloading_cycle_mask = 6;
2547 static const uint8_t _unloading_cycle_shift = 1;
2548
2549 static uint8_t set_is_unloading(uint8_t state, bool value) {
2550 state &= (uint8_t)~_is_unloading_mask;
2551 if (value) {
2552 state |= 1 << _is_unloading_shift;
2553 }
2554 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2555 return state;
2556 }
2557
2558 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2559 state &= (uint8_t)~_unloading_cycle_mask;
2560 state |= (uint8_t)(value << _unloading_cycle_shift);
2561 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2562 return state;
2563 }
2564
2565 public:
2566 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2567 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2568
2569 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2570 uint8_t state = 0;
2571 state = set_is_unloading(state, is_unloading);
2572 state = set_unloading_cycle(state, unloading_cycle);
2573 return state;
2574 }
2575 };
2576
2577 bool nmethod::is_unloading() {
2578 uint8_t state = Atomic::load(&_is_unloading_state);
2579 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2580 if (state_is_unloading) {
2581 return true;
2582 }
2583 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2584 uint8_t current_cycle = CodeCache::unloading_cycle();
2585 if (state_unloading_cycle == current_cycle) {
2586 return false;
2587 }
2588
2589 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2590 // should be unloaded. This can be either because there is a dead oop,
2591 // or because is_cold() heuristically determines it is time to unload.
2592 state_unloading_cycle = current_cycle;
2593 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2594 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2595
2596 // Note that if an nmethod has dead oops, everyone will agree that the
2597 // nmethod is_unloading. However, the is_cold heuristics can yield
2598 // different outcomes, so we guard the computed result with a CAS
2599 // to ensure all threads have a shared view of whether an nmethod
2600 // is_unloading or not.
2601 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2602
2603 if (found_state == state) {
2604 // First to change state, we win
2605 return state_is_unloading;
2606 } else {
2607 // State already set, so use it
2608 return IsUnloadingState::is_unloading(found_state);
2609 }
2610 }
2611
2612 void nmethod::clear_unloading_state() {
2613 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2614 Atomic::store(&_is_unloading_state, state);
2615 }
2616
2617
2618 // This is called at the end of the strong tracing/marking phase of a
2619 // GC to unload an nmethod if it contains otherwise unreachable
2620 // oops or is heuristically found to be not important.
2621 void nmethod::do_unloading(bool unloading_occurred) {
2622 // Make sure the oop's ready to receive visitors
2623 if (is_unloading()) {
2624 unlink();
2625 } else {
2626 unload_nmethod_caches(unloading_occurred);
2627 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2628 if (bs_nm != nullptr) {
2629 bs_nm->disarm(this);
2630 }
2631 }
2632 }
2633
2634 void nmethod::oops_do(OopClosure* f, bool allow_dead) {
2635 // Prevent extra code cache walk for platforms that don't have immediate oops.
2636 if (relocInfo::mustIterateImmediateOopsInCode()) {
2637 RelocIterator iter(this, oops_reloc_begin());
2638
2639 while (iter.next()) {
2640 if (iter.type() == relocInfo::oop_type ) {
2641 oop_Relocation* r = iter.oop_reloc();
2642 // In this loop, we must only follow those oops directly embedded in
2643 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2644 assert(1 == (r->oop_is_immediate()) +
2645 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2646 "oop must be found in exactly one place");
2647 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2648 f->do_oop(r->oop_addr());
2649 }
2650 }
2651 }
2652 }
2653
2654 // Scopes
2655 // This includes oop constants not inlined in the code stream.
2656 for (oop* p = oops_begin(); p < oops_end(); p++) {
2657 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2658 f->do_oop(p);
2659 }
2660 }
2661
2662 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2663 // Process oops in the nmethod
2664 oops_do(cl);
2665
2666 // CodeCache unloading support
2667 mark_as_maybe_on_stack();
2668
2669 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2670 bs_nm->disarm(this);
2671
2672 // There's an assumption made that this function is not used by GCs that
2673 // relocate objects, and therefore we don't call fix_oop_relocations.
2674 }
2675
2676 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2677
2678 void nmethod::oops_do_log_change(const char* state) {
2679 LogTarget(Trace, gc, nmethod) lt;
2680 if (lt.is_enabled()) {
2681 LogStream ls(lt);
2682 CompileTask::print(&ls, this, state, true /* short_form */);
2683 }
2684 }
2685
2686 bool nmethod::oops_do_try_claim() {
2687 if (oops_do_try_claim_weak_request()) {
2688 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2689 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2690 return true;
2691 }
2692 return false;
2693 }
2694
2695 bool nmethod::oops_do_try_claim_weak_request() {
2696 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2697
2698 if ((_oops_do_mark_link == nullptr) &&
2699 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2700 oops_do_log_change("oops_do, mark weak request");
2701 return true;
2702 }
2703 return false;
2704 }
2705
2706 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2707 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2708 }
2709
2710 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2711 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2712
2713 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2714 if (old_next == nullptr) {
2715 oops_do_log_change("oops_do, mark strong done");
2716 }
2717 return old_next;
2718 }
2719
2720 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2721 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2722 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2723
2724 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2725 if (old_next == next) {
2726 oops_do_log_change("oops_do, mark strong request");
2727 }
2728 return old_next;
2729 }
2730
2731 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2732 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2733 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2734
2735 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2736 if (old_next == next) {
2737 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2738 return true;
2739 }
2740 return false;
2741 }
2742
2743 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2744 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2745
2746 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2747 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2748 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2749
2750 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2751 // Self-loop if needed.
2752 if (old_head == nullptr) {
2753 old_head = this;
2754 }
2755 // Try to install end of list and weak done tag.
2756 if (Atomic::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
2757 oops_do_log_change("oops_do, mark weak done");
2758 return nullptr;
2759 } else {
2760 return old_head;
2761 }
2762 }
2763
2764 void nmethod::oops_do_add_to_list_as_strong_done() {
2765 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2766
2767 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this);
2768 // Self-loop if needed.
2769 if (old_head == nullptr) {
2770 old_head = this;
2771 }
2772 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2773 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2774
2775 oops_do_set_strong_done(old_head);
2776 }
2777
2778 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2779 if (!oops_do_try_claim_weak_request()) {
2780 // Failed to claim for weak processing.
2781 oops_do_log_change("oops_do, mark weak request fail");
2782 return;
2783 }
2784
2785 p->do_regular_processing(this);
2786
2787 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2788 if (old_head == nullptr) {
2789 return;
2790 }
2791 oops_do_log_change("oops_do, mark weak done fail");
2792 // Adding to global list failed, another thread added a strong request.
2793 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2794 "must be but is %u", extract_state(_oops_do_mark_link));
2795
2796 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2797
2798 oops_do_set_strong_done(old_head);
2799 // Do missing strong processing.
2800 p->do_remaining_strong_processing(this);
2801 }
2802
2803 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2804 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2805 if (next_raw == nullptr) {
2806 p->do_regular_processing(this);
2807 oops_do_add_to_list_as_strong_done();
2808 return;
2809 }
2810 // Claim failed. Figure out why and handle it.
2811 if (oops_do_has_weak_request(next_raw)) {
2812 oops_do_mark_link* old = next_raw;
2813 // Claim failed because being weak processed (state == "weak request").
2814 // Try to request deferred strong processing.
2815 next_raw = oops_do_try_add_strong_request(old);
2816 if (next_raw == old) {
2817 // Successfully requested deferred strong processing.
2818 return;
2819 }
2820 // Failed because of a concurrent transition. No longer in "weak request" state.
2821 }
2822 if (oops_do_has_any_strong_state(next_raw)) {
2823 // Already claimed for strong processing or requested for such.
2824 return;
2825 }
2826 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2827 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2828 p->do_remaining_strong_processing(this);
2829 return;
2830 }
2831 // Claim failed, some other thread got it.
2832 }
2833
2834 void nmethod::oops_do_marking_prologue() {
2835 assert_at_safepoint();
2836
2837 log_trace(gc, nmethod)("oops_do_marking_prologue");
2838 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2839 }
2840
2841 void nmethod::oops_do_marking_epilogue() {
2842 assert_at_safepoint();
2843
2844 nmethod* next = _oops_do_mark_nmethods;
2845 _oops_do_mark_nmethods = nullptr;
2846 if (next != nullptr) {
2847 nmethod* cur;
2848 do {
2849 cur = next;
2850 next = extract_nmethod(cur->_oops_do_mark_link);
2851 cur->_oops_do_mark_link = nullptr;
2852 DEBUG_ONLY(cur->verify_oop_relocations());
2853
2854 LogTarget(Trace, gc, nmethod) lt;
2855 if (lt.is_enabled()) {
2856 LogStream ls(lt);
2857 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
2858 }
2859 // End if self-loop has been detected.
2860 } while (cur != next);
2861 }
2862 log_trace(gc, nmethod)("oops_do_marking_epilogue");
2863 }
2864
2865 inline bool includes(void* p, void* from, void* to) {
2866 return from <= p && p < to;
2867 }
2868
2869
2870 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
2871 assert(count >= 2, "must be sentinel values, at least");
2872
2873 #ifdef ASSERT
2874 // must be sorted and unique; we do a binary search in find_pc_desc()
2875 int prev_offset = pcs[0].pc_offset();
2876 assert(prev_offset == PcDesc::lower_offset_limit,
2877 "must start with a sentinel");
2878 for (int i = 1; i < count; i++) {
2879 int this_offset = pcs[i].pc_offset();
2880 assert(this_offset > prev_offset, "offsets must be sorted");
2881 prev_offset = this_offset;
2882 }
2883 assert(prev_offset == PcDesc::upper_offset_limit,
2884 "must end with a sentinel");
2885 #endif //ASSERT
2886
2887 // Search for MethodHandle invokes and tag the nmethod.
2888 for (int i = 0; i < count; i++) {
2889 if (pcs[i].is_method_handle_invoke()) {
2890 set_has_method_handle_invokes(true);
2891 break;
2892 }
2893 }
2894 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler");
2895
2896 int size = count * sizeof(PcDesc);
2897 assert(scopes_pcs_size() >= size, "oob");
2898 memcpy(scopes_pcs_begin(), pcs, size);
2899
2900 // Adjust the final sentinel downward.
2901 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
2902 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
2903 last_pc->set_pc_offset(content_size() + 1);
2904 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
2905 // Fill any rounding gaps with copies of the last record.
2906 last_pc[1] = last_pc[0];
2907 }
2908 // The following assert could fail if sizeof(PcDesc) is not
2909 // an integral multiple of oopSize (the rounding term).
2910 // If it fails, change the logic to always allocate a multiple
2911 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
2912 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
2913 }
2914
2915 void nmethod::copy_scopes_data(u_char* buffer, int size) {
2916 assert(scopes_data_size() >= size, "oob");
2917 memcpy(scopes_data_begin(), buffer, size);
2918 }
2919
2920 #ifdef ASSERT
2921 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
2922 PcDesc* res = nullptr;
2923 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
2924 "must start with a sentinel");
2925 // lower + 1 to exclude initial sentinel
2926 for (PcDesc* p = lower + 1; p < upper; p++) {
2927 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
2928 if (match_desc(p, pc_offset, approximate)) {
2929 if (res == nullptr) {
2930 res = p;
2931 } else {
2932 res = (PcDesc*) badAddress;
2933 }
2934 }
2935 }
2936 return res;
2937 }
2938 #endif
2939
2940
2941 #ifndef PRODUCT
2942 // Version of method to collect statistic
2943 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
2944 PcDesc* lower, PcDesc* upper) {
2945 ++pc_nmethod_stats.pc_desc_queries;
2946 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
2947
2948 PcDesc* desc = _pc_desc_cache.last_pc_desc();
2949 assert(desc != nullptr, "PcDesc cache should be initialized already");
2950 if (desc->pc_offset() == (pc - code_begin)) {
2951 // Cached value matched
2952 ++pc_nmethod_stats.pc_desc_tests;
2953 ++pc_nmethod_stats.pc_desc_repeats;
2954 return desc;
2955 }
2956 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
2957 }
2958 #endif
2959
2960 // Finds a PcDesc with real-pc equal to "pc"
2961 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
2962 PcDesc* lower_incl, PcDesc* upper_incl) {
2963 if ((pc < code_begin) ||
2964 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
2965 return nullptr; // PC is wildly out of range
2966 }
2967 int pc_offset = (int) (pc - code_begin);
2968
2969 // Check the PcDesc cache if it contains the desired PcDesc
2970 // (This as an almost 100% hit rate.)
2971 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
2972 if (res != nullptr) {
2973 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
2974 return res;
2975 }
2976
2977 // Fallback algorithm: quasi-linear search for the PcDesc
2978 // Find the last pc_offset less than the given offset.
2979 // The successor must be the required match, if there is a match at all.
2980 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
2981 PcDesc* lower = lower_incl; // this is initial sentinel
2982 PcDesc* upper = upper_incl - 1; // exclude final sentinel
2983 if (lower >= upper) return nullptr; // no PcDescs at all
2984
2985 #define assert_LU_OK \
2986 /* invariant on lower..upper during the following search: */ \
2987 assert(lower->pc_offset() < pc_offset, "sanity"); \
2988 assert(upper->pc_offset() >= pc_offset, "sanity")
2989 assert_LU_OK;
2990
2991 // Use the last successful return as a split point.
2992 PcDesc* mid = _pc_desc_cache.last_pc_desc();
2993 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
2994 if (mid->pc_offset() < pc_offset) {
2995 lower = mid;
2996 } else {
2997 upper = mid;
2998 }
2999
3000 // Take giant steps at first (4096, then 256, then 16, then 1)
3001 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1);
3002 const int RADIX = (1 << LOG2_RADIX);
3003 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3004 while ((mid = lower + step) < upper) {
3005 assert_LU_OK;
3006 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3007 if (mid->pc_offset() < pc_offset) {
3008 lower = mid;
3009 } else {
3010 upper = mid;
3011 break;
3012 }
3013 }
3014 assert_LU_OK;
3015 }
3016
3017 // Sneak up on the value with a linear search of length ~16.
3018 while (true) {
3019 assert_LU_OK;
3020 mid = lower + 1;
3021 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3022 if (mid->pc_offset() < pc_offset) {
3023 lower = mid;
3024 } else {
3025 upper = mid;
3026 break;
3027 }
3028 }
3029 #undef assert_LU_OK
3030
3031 if (match_desc(upper, pc_offset, approximate)) {
3032 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3033 if (!Thread::current_in_asgct()) {
3034 // we don't want to modify the cache if we're in ASGCT
3035 // which is typically called in a signal handler
3036 _pc_desc_cache.add_pc_desc(upper);
3037 }
3038 return upper;
3039 } else {
3040 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3041 return nullptr;
3042 }
3043 }
3044
3045 bool nmethod::check_dependency_on(DepChange& changes) {
3046 // What has happened:
3047 // 1) a new class dependee has been added
3048 // 2) dependee and all its super classes have been marked
3049 bool found_check = false; // set true if we are upset
3050 for (Dependencies::DepStream deps(this); deps.next(); ) {
3051 // Evaluate only relevant dependencies.
3052 if (deps.spot_check_dependency_at(changes) != nullptr) {
3053 found_check = true;
3054 NOT_DEBUG(break);
3055 }
3056 }
3057 return found_check;
3058 }
3059
3060 // Called from mark_for_deoptimization, when dependee is invalidated.
3061 bool nmethod::is_dependent_on_method(Method* dependee) {
3062 for (Dependencies::DepStream deps(this); deps.next(); ) {
3063 if (deps.type() != Dependencies::evol_method)
3064 continue;
3065 Method* method = deps.method_argument(0);
3066 if (method == dependee) return true;
3067 }
3068 return false;
3069 }
3070
3071 void nmethod_init() {
3072 // make sure you didn't forget to adjust the filler fields
3073 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3074 }
3075
3076 // -----------------------------------------------------------------------------
3077 // Verification
3078
3079 class VerifyOopsClosure: public OopClosure {
3080 nmethod* _nm;
3081 bool _ok;
3082 public:
3083 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3084 bool ok() { return _ok; }
3085 virtual void do_oop(oop* p) {
3086 if (oopDesc::is_oop_or_null(*p)) return;
3087 // Print diagnostic information before calling print_nmethod().
3088 // Assertions therein might prevent call from returning.
3089 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3090 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3091 if (_ok) {
3092 _nm->print_nmethod(true);
3093 _ok = false;
3094 }
3095 }
3096 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3097 };
3098
3099 class VerifyMetadataClosure: public MetadataClosure {
3100 public:
3101 void do_metadata(Metadata* md) {
3102 if (md->is_method()) {
3103 Method* method = (Method*)md;
3104 assert(!method->is_old(), "Should not be installing old methods");
3105 }
3106 }
3107 };
3108
3109
3110 void nmethod::verify() {
3111 if (is_not_entrant())
3112 return;
3113
3114 // Make sure all the entry points are correctly aligned for patching.
3115 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point());
3116
3117 // assert(oopDesc::is_oop(method()), "must be valid");
3118
3119 ResourceMark rm;
3120
3121 if (!CodeCache::contains(this)) {
3122 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3123 }
3124
3125 if(is_native_method() )
3126 return;
3127
3128 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3129 if (nm != this) {
3130 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3131 }
3132
3133 // Verification can triggered during shutdown after SCCache is closed.
3134 // If the Scopes data is in the AOT code cache, then we should avoid verification during shutdown.
3135 if (!is_scc() || SCCache::is_on()) {
3136 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3137 if (! p->verify(this)) {
3138 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3139 }
3140 }
3141
3142 #ifdef ASSERT
3143 #if INCLUDE_JVMCI
3144 {
3145 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3146 ImmutableOopMapSet* oms = oop_maps();
3147 ImplicitExceptionTable implicit_table(this);
3148 for (uint i = 0; i < implicit_table.len(); i++) {
3149 int exec_offset = (int) implicit_table.get_exec_offset(i);
3150 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3151 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3152 bool found = false;
3153 for (int i = 0, imax = oms->count(); i < imax; i++) {
3154 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3155 found = true;
3156 break;
3157 }
3158 }
3159 assert(found, "missing oopmap");
3160 }
3161 }
3162 }
3163 #endif
3164 #endif
3165 }
3166
3167 VerifyOopsClosure voc(this);
3168 oops_do(&voc);
3169 assert(voc.ok(), "embedded oops must be OK");
3170 Universe::heap()->verify_nmethod(this);
3171
3172 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3173 nm->method()->external_name(), p2i(_oops_do_mark_link));
3174 if (!is_scc() || SCCache::is_on()) {
3175 verify_scopes();
3176 }
3177
3178 CompiledICLocker nm_verify(this);
3179 VerifyMetadataClosure vmc;
3180 metadata_do(&vmc);
3181 }
3182
3183
3184 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3185
3186 // Verify IC only when nmethod installation is finished.
3187 if (!is_not_installed()) {
3188 if (CompiledICLocker::is_safe(this)) {
3189 if (is_inline_cache) {
3190 CompiledIC_at(this, call_site);
3191 } else {
3192 CompiledDirectCall::at(call_site);
3193 }
3194 } else {
3195 CompiledICLocker ml_verify(this);
3196 if (is_inline_cache) {
3197 CompiledIC_at(this, call_site);
3198 } else {
3199 CompiledDirectCall::at(call_site);
3200 }
3201 }
3202 }
3203
3204 HandleMark hm(Thread::current());
3205
3206 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3207 assert(pd != nullptr, "PcDesc must exist");
3208 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3209 !sd->is_top(); sd = sd->sender()) {
3210 sd->verify();
3211 }
3212 }
3213
3214 void nmethod::verify_scopes() {
3215 if( !method() ) return; // Runtime stubs have no scope
3216 if (method()->is_native()) return; // Ignore stub methods.
3217 // iterate through all interrupt point
3218 // and verify the debug information is valid.
3219 RelocIterator iter(this);
3220 while (iter.next()) {
3221 address stub = nullptr;
3222 switch (iter.type()) {
3223 case relocInfo::virtual_call_type:
3224 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3225 break;
3226 case relocInfo::opt_virtual_call_type:
3227 stub = iter.opt_virtual_call_reloc()->static_stub();
3228 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3229 break;
3230 case relocInfo::static_call_type:
3231 stub = iter.static_call_reloc()->static_stub();
3232 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3233 break;
3234 case relocInfo::runtime_call_type:
3235 case relocInfo::runtime_call_w_cp_type: {
3236 address destination = iter.reloc()->value();
3237 // Right now there is no way to find out which entries support
3238 // an interrupt point. It would be nice if we had this
3239 // information in a table.
3240 break;
3241 }
3242 default:
3243 break;
3244 }
3245 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3246 }
3247 }
3248
3249
3250 // -----------------------------------------------------------------------------
3251 // Printing operations
3252
3253 void nmethod::print_on_impl(outputStream* st) const {
3254 ResourceMark rm;
3255
3256 st->print("Compiled method ");
3257
3258 if (is_compiled_by_c1()) {
3259 st->print("(c1) ");
3260 } else if (is_compiled_by_c2()) {
3261 st->print("(c2) ");
3262 } else if (is_compiled_by_jvmci()) {
3263 st->print("(JVMCI) ");
3264 } else {
3265 st->print("(n/a) ");
3266 }
3267
3268 print_on_with_msg(st, nullptr);
3269
3270 if (WizardMode) {
3271 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3272 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3273 st->print(" { ");
3274 st->print_cr("%s ", state());
3275 st->print_cr("}:");
3276 }
3277 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3278 p2i(this),
3279 p2i(this) + size(),
3280 size());
3281 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3282 p2i(consts_begin()),
3283 p2i(consts_end()),
3284 consts_size());
3285 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3286 p2i(insts_begin()),
3287 p2i(insts_end()),
3288 insts_size());
3289 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3290 p2i(stub_begin()),
3291 p2i(stub_end()),
3292 stub_size());
3293 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3294 p2i(oops_begin()),
3295 p2i(oops_end()),
3296 oops_size());
3297 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3298 p2i(mutable_data_begin()),
3299 p2i(mutable_data_end()),
3300 mutable_data_size());
3301 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3302 p2i(relocation_begin()),
3303 p2i(relocation_end()),
3304 relocation_size());
3305 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3306 p2i(metadata_begin()),
3307 p2i(metadata_end()),
3308 metadata_size());
3309 #if INCLUDE_JVMCI
3310 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3311 p2i(jvmci_data_begin()),
3312 p2i(jvmci_data_end()),
3313 jvmci_data_size());
3314 #endif
3315 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3316 p2i(immutable_data_begin()),
3317 p2i(immutable_data_end()),
3318 immutable_data_size());
3319 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3320 p2i(dependencies_begin()),
3321 p2i(dependencies_end()),
3322 dependencies_size());
3323 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3324 p2i(nul_chk_table_begin()),
3325 p2i(nul_chk_table_end()),
3326 nul_chk_table_size());
3327 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3328 p2i(handler_table_begin()),
3329 p2i(handler_table_end()),
3330 handler_table_size());
3331 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3332 p2i(scopes_pcs_begin()),
3333 p2i(scopes_pcs_end()),
3334 scopes_pcs_size());
3335 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3336 p2i(scopes_data_begin()),
3337 p2i(scopes_data_end()),
3338 scopes_data_size());
3339 #if INCLUDE_JVMCI
3340 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3341 p2i(speculations_begin()),
3342 p2i(speculations_end()),
3343 speculations_size());
3344 #endif
3345 if (SCCache::is_on() && _scc_entry != nullptr) {
3346 _scc_entry->print(st);
3347 }
3348 }
3349
3350 void nmethod::print_code() {
3351 ResourceMark m;
3352 ttyLocker ttyl;
3353 // Call the specialized decode method of this class.
3354 decode(tty);
3355 }
3356
3357 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3358
3359 void nmethod::print_dependencies_on(outputStream* out) {
3360 ResourceMark rm;
3361 stringStream st;
3362 st.print_cr("Dependencies:");
3363 for (Dependencies::DepStream deps(this); deps.next(); ) {
3364 deps.print_dependency(&st);
3365 InstanceKlass* ctxk = deps.context_type();
3366 if (ctxk != nullptr) {
3367 if (ctxk->is_dependent_nmethod(this)) {
3368 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3369 }
3370 }
3371 deps.log_dependency(); // put it into the xml log also
3372 }
3373 out->print_raw(st.as_string());
3374 }
3375 #endif
3376
3377 #if defined(SUPPORT_DATA_STRUCTS)
3378
3379 // Print the oops from the underlying CodeBlob.
3380 void nmethod::print_oops(outputStream* st) {
3381 ResourceMark m;
3382 st->print("Oops:");
3383 if (oops_begin() < oops_end()) {
3384 st->cr();
3385 for (oop* p = oops_begin(); p < oops_end(); p++) {
3386 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3387 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3388 if (Universe::contains_non_oop_word(p)) {
3389 st->print_cr("NON_OOP");
3390 continue; // skip non-oops
3391 }
3392 if (*p == nullptr) {
3393 st->print_cr("nullptr-oop");
3394 continue; // skip non-oops
3395 }
3396 (*p)->print_value_on(st);
3397 st->cr();
3398 }
3399 } else {
3400 st->print_cr(" <list empty>");
3401 }
3402 }
3403
3404 // Print metadata pool.
3405 void nmethod::print_metadata(outputStream* st) {
3406 ResourceMark m;
3407 st->print("Metadata:");
3408 if (metadata_begin() < metadata_end()) {
3409 st->cr();
3410 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3411 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3412 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3413 if (*p && *p != Universe::non_oop_word()) {
3414 (*p)->print_value_on(st);
3415 }
3416 st->cr();
3417 }
3418 } else {
3419 st->print_cr(" <list empty>");
3420 }
3421 }
3422
3423 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3424 void nmethod::print_scopes_on(outputStream* st) {
3425 // Find the first pc desc for all scopes in the code and print it.
3426 ResourceMark rm;
3427 st->print("scopes:");
3428 if (scopes_pcs_begin() < scopes_pcs_end()) {
3429 st->cr();
3430 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3431 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3432 continue;
3433
3434 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3435 while (sd != nullptr) {
3436 sd->print_on(st, p); // print output ends with a newline
3437 sd = sd->sender();
3438 }
3439 }
3440 } else {
3441 st->print_cr(" <list empty>");
3442 }
3443 }
3444 #endif
3445
3446 #ifndef PRODUCT // RelocIterator does support printing only then.
3447 void nmethod::print_relocations_on(outputStream* st) {
3448 ResourceMark m; // in case methods get printed via the debugger
3449 st->print_cr("relocations:");
3450 RelocIterator iter(this);
3451 iter.print_on(st);
3452 }
3453 #endif
3454
3455 void nmethod::print_pcs_on(outputStream* st) {
3456 ResourceMark m; // in case methods get printed via debugger
3457 st->print("pc-bytecode offsets:");
3458 if (scopes_pcs_begin() < scopes_pcs_end()) {
3459 st->cr();
3460 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3461 p->print_on(st, this); // print output ends with a newline
3462 }
3463 } else {
3464 st->print_cr(" <list empty>");
3465 }
3466 }
3467
3468 void nmethod::print_handler_table() {
3469 ExceptionHandlerTable(this).print(code_begin());
3470 }
3471
3472 void nmethod::print_nul_chk_table() {
3473 ImplicitExceptionTable(this).print(code_begin());
3474 }
3475
3476 void nmethod::print_recorded_oop(int log_n, int i) {
3477 void* value;
3478
3479 if (i == 0) {
3480 value = nullptr;
3481 } else {
3482 // Be careful around non-oop words. Don't create an oop
3483 // with that value, or it will assert in verification code.
3484 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3485 value = Universe::non_oop_word();
3486 } else {
3487 value = oop_at(i);
3488 }
3489 }
3490
3491 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3492
3493 if (value == Universe::non_oop_word()) {
3494 tty->print("non-oop word");
3495 } else {
3496 if (value == nullptr) {
3497 tty->print("nullptr-oop");
3498 } else {
3499 oop_at(i)->print_value_on(tty);
3500 }
3501 }
3502
3503 tty->cr();
3504 }
3505
3506 void nmethod::print_recorded_oops() {
3507 const int n = oops_count();
3508 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3509 tty->print("Recorded oops:");
3510 if (n > 0) {
3511 tty->cr();
3512 for (int i = 0; i < n; i++) {
3513 print_recorded_oop(log_n, i);
3514 }
3515 } else {
3516 tty->print_cr(" <list empty>");
3517 }
3518 }
3519
3520 void nmethod::print_recorded_metadata() {
3521 const int n = metadata_count();
3522 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3523 tty->print("Recorded metadata:");
3524 if (n > 0) {
3525 tty->cr();
3526 for (int i = 0; i < n; i++) {
3527 Metadata* m = metadata_at(i);
3528 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3529 if (m == (Metadata*)Universe::non_oop_word()) {
3530 tty->print("non-metadata word");
3531 } else if (m == nullptr) {
3532 tty->print("nullptr-oop");
3533 } else {
3534 Metadata::print_value_on_maybe_null(tty, m);
3535 }
3536 tty->cr();
3537 }
3538 } else {
3539 tty->print_cr(" <list empty>");
3540 }
3541 }
3542 #endif
3543
3544 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3545
3546 void nmethod::print_constant_pool(outputStream* st) {
3547 //-----------------------------------
3548 //---< Print the constant pool >---
3549 //-----------------------------------
3550 int consts_size = this->consts_size();
3551 if ( consts_size > 0 ) {
3552 unsigned char* cstart = this->consts_begin();
3553 unsigned char* cp = cstart;
3554 unsigned char* cend = cp + consts_size;
3555 unsigned int bytes_per_line = 4;
3556 unsigned int CP_alignment = 8;
3557 unsigned int n;
3558
3559 st->cr();
3560
3561 //---< print CP header to make clear what's printed >---
3562 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3563 n = bytes_per_line;
3564 st->print_cr("[Constant Pool]");
3565 Disassembler::print_location(cp, cstart, cend, st, true, true);
3566 Disassembler::print_hexdata(cp, n, st, true);
3567 st->cr();
3568 } else {
3569 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3570 st->print_cr("[Constant Pool (unaligned)]");
3571 }
3572
3573 //---< print CP contents, bytes_per_line at a time >---
3574 while (cp < cend) {
3575 Disassembler::print_location(cp, cstart, cend, st, true, false);
3576 Disassembler::print_hexdata(cp, n, st, false);
3577 cp += n;
3578 n = bytes_per_line;
3579 st->cr();
3580 }
3581
3582 //---< Show potential alignment gap between constant pool and code >---
3583 cend = code_begin();
3584 if( cp < cend ) {
3585 n = 4;
3586 st->print_cr("[Code entry alignment]");
3587 while (cp < cend) {
3588 Disassembler::print_location(cp, cstart, cend, st, false, false);
3589 cp += n;
3590 st->cr();
3591 }
3592 }
3593 } else {
3594 st->print_cr("[Constant Pool (empty)]");
3595 }
3596 st->cr();
3597 }
3598
3599 #endif
3600
3601 // Disassemble this nmethod.
3602 // Print additional debug information, if requested. This could be code
3603 // comments, block comments, profiling counters, etc.
3604 // The undisassembled format is useful no disassembler library is available.
3605 // The resulting hex dump (with markers) can be disassembled later, or on
3606 // another system, when/where a disassembler library is available.
3607 void nmethod::decode2(outputStream* ost) const {
3608
3609 // Called from frame::back_trace_with_decode without ResourceMark.
3610 ResourceMark rm;
3611
3612 // Make sure we have a valid stream to print on.
3613 outputStream* st = ost ? ost : tty;
3614
3615 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3616 const bool use_compressed_format = true;
3617 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3618 AbstractDisassembler::show_block_comment());
3619 #else
3620 const bool use_compressed_format = Disassembler::is_abstract();
3621 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3622 AbstractDisassembler::show_block_comment());
3623 #endif
3624
3625 st->cr();
3626 this->print_on(st);
3627 st->cr();
3628
3629 #if defined(SUPPORT_ASSEMBLY)
3630 //----------------------------------
3631 //---< Print real disassembly >---
3632 //----------------------------------
3633 if (! use_compressed_format) {
3634 st->print_cr("[Disassembly]");
3635 Disassembler::decode(const_cast<nmethod*>(this), st);
3636 st->bol();
3637 st->print_cr("[/Disassembly]");
3638 return;
3639 }
3640 #endif
3641
3642 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3643
3644 // Compressed undisassembled disassembly format.
3645 // The following status values are defined/supported:
3646 // = 0 - currently at bol() position, nothing printed yet on current line.
3647 // = 1 - currently at position after print_location().
3648 // > 1 - in the midst of printing instruction stream bytes.
3649 int compressed_format_idx = 0;
3650 int code_comment_column = 0;
3651 const int instr_maxlen = Assembler::instr_maxlen();
3652 const uint tabspacing = 8;
3653 unsigned char* start = this->code_begin();
3654 unsigned char* p = this->code_begin();
3655 unsigned char* end = this->code_end();
3656 unsigned char* pss = p; // start of a code section (used for offsets)
3657
3658 if ((start == nullptr) || (end == nullptr)) {
3659 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3660 return;
3661 }
3662 #endif
3663
3664 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3665 //---< plain abstract disassembly, no comments or anything, just section headers >---
3666 if (use_compressed_format && ! compressed_with_comments) {
3667 const_cast<nmethod*>(this)->print_constant_pool(st);
3668
3669 //---< Open the output (Marker for post-mortem disassembler) >---
3670 st->print_cr("[MachCode]");
3671 const char* header = nullptr;
3672 address p0 = p;
3673 while (p < end) {
3674 address pp = p;
3675 while ((p < end) && (header == nullptr)) {
3676 header = nmethod_section_label(p);
3677 pp = p;
3678 p += Assembler::instr_len(p);
3679 }
3680 if (pp > p0) {
3681 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3682 p0 = pp;
3683 p = pp;
3684 header = nullptr;
3685 } else if (header != nullptr) {
3686 st->bol();
3687 st->print_cr("%s", header);
3688 header = nullptr;
3689 }
3690 }
3691 //---< Close the output (Marker for post-mortem disassembler) >---
3692 st->bol();
3693 st->print_cr("[/MachCode]");
3694 return;
3695 }
3696 #endif
3697
3698 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3699 //---< abstract disassembly with comments and section headers merged in >---
3700 if (compressed_with_comments) {
3701 const_cast<nmethod*>(this)->print_constant_pool(st);
3702
3703 //---< Open the output (Marker for post-mortem disassembler) >---
3704 st->print_cr("[MachCode]");
3705 while ((p < end) && (p != nullptr)) {
3706 const int instruction_size_in_bytes = Assembler::instr_len(p);
3707
3708 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3709 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3710 // Prints nmethod_section_label as well.
3711 if (AbstractDisassembler::show_block_comment()) {
3712 print_block_comment(st, p);
3713 if (st->position() == 0) {
3714 compressed_format_idx = 0;
3715 }
3716 }
3717
3718 //---< New location information after line break >---
3719 if (compressed_format_idx == 0) {
3720 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3721 compressed_format_idx = 1;
3722 }
3723
3724 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3725 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3726 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3727
3728 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3729 //---< interrupt instruction byte stream for code comment >---
3730 if (compressed_format_idx > 1) {
3731 st->cr(); // interrupt byte stream
3732 st->cr(); // add an empty line
3733 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3734 }
3735 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3736 st->bol();
3737 compressed_format_idx = 0;
3738 }
3739
3740 //---< New location information after line break >---
3741 if (compressed_format_idx == 0) {
3742 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3743 compressed_format_idx = 1;
3744 }
3745
3746 //---< Nicely align instructions for readability >---
3747 if (compressed_format_idx > 1) {
3748 Disassembler::print_delimiter(st);
3749 }
3750
3751 //---< Now, finally, print the actual instruction bytes >---
3752 unsigned char* p0 = p;
3753 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3754 compressed_format_idx += (int)(p - p0);
3755
3756 if (Disassembler::start_newline(compressed_format_idx-1)) {
3757 st->cr();
3758 compressed_format_idx = 0;
3759 }
3760 }
3761 //---< Close the output (Marker for post-mortem disassembler) >---
3762 st->bol();
3763 st->print_cr("[/MachCode]");
3764 return;
3765 }
3766 #endif
3767 }
3768
3769 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3770
3771 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3772 RelocIterator iter(this, begin, end);
3773 bool have_one = false;
3774 while (iter.next()) {
3775 have_one = true;
3776 switch (iter.type()) {
3777 case relocInfo::none: {
3778 // Skip it and check next
3779 break;
3780 }
3781 case relocInfo::oop_type: {
3782 // Get a non-resizable resource-allocated stringStream.
3783 // Our callees make use of (nested) ResourceMarks.
3784 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3785 oop_Relocation* r = iter.oop_reloc();
3786 oop obj = r->oop_value();
3787 st.print("oop(");
3788 if (obj == nullptr) st.print("nullptr");
3789 else obj->print_value_on(&st);
3790 st.print(")");
3791 return st.as_string();
3792 }
3793 case relocInfo::metadata_type: {
3794 stringStream st;
3795 metadata_Relocation* r = iter.metadata_reloc();
3796 Metadata* obj = r->metadata_value();
3797 st.print("metadata(");
3798 if (obj == nullptr) st.print("nullptr");
3799 else obj->print_value_on(&st);
3800 st.print(")");
3801 return st.as_string();
3802 }
3803 case relocInfo::runtime_call_type:
3804 case relocInfo::runtime_call_w_cp_type: {
3805 stringStream st;
3806 st.print("runtime_call");
3807 CallRelocation* r = (CallRelocation*)iter.reloc();
3808 address dest = r->destination();
3809 if (StubRoutines::contains(dest)) {
3810 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3811 if (desc == nullptr) {
3812 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3813 }
3814 if (desc != nullptr) {
3815 st.print(" Stub::%s", desc->name());
3816 return st.as_string();
3817 }
3818 }
3819 CodeBlob* cb = CodeCache::find_blob(dest);
3820 if (cb != nullptr) {
3821 st.print(" %s", cb->name());
3822 } else {
3823 ResourceMark rm;
3824 const int buflen = 1024;
3825 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3826 int offset;
3827 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3828 st.print(" %s", buf);
3829 if (offset != 0) {
3830 st.print("+%d", offset);
3831 }
3832 }
3833 }
3834 return st.as_string();
3835 }
3836 case relocInfo::virtual_call_type: {
3837 stringStream st;
3838 st.print_raw("virtual_call");
3839 virtual_call_Relocation* r = iter.virtual_call_reloc();
3840 Method* m = r->method_value();
3841 if (m != nullptr) {
3842 assert(m->is_method(), "");
3843 m->print_short_name(&st);
3844 }
3845 return st.as_string();
3846 }
3847 case relocInfo::opt_virtual_call_type: {
3848 stringStream st;
3849 st.print_raw("optimized virtual_call");
3850 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3851 Method* m = r->method_value();
3852 if (m != nullptr) {
3853 assert(m->is_method(), "");
3854 m->print_short_name(&st);
3855 }
3856 return st.as_string();
3857 }
3858 case relocInfo::static_call_type: {
3859 stringStream st;
3860 st.print_raw("static_call");
3861 static_call_Relocation* r = iter.static_call_reloc();
3862 Method* m = r->method_value();
3863 if (m != nullptr) {
3864 assert(m->is_method(), "");
3865 m->print_short_name(&st);
3866 }
3867 return st.as_string();
3868 }
3869 case relocInfo::static_stub_type: return "static_stub";
3870 case relocInfo::external_word_type: return "external_word";
3871 case relocInfo::internal_word_type: return "internal_word";
3872 case relocInfo::section_word_type: return "section_word";
3873 case relocInfo::poll_type: return "poll";
3874 case relocInfo::poll_return_type: return "poll_return";
3875 case relocInfo::trampoline_stub_type: return "trampoline_stub";
3876 case relocInfo::entry_guard_type: return "entry_guard";
3877 case relocInfo::post_call_nop_type: return "post_call_nop";
3878 case relocInfo::barrier_type: {
3879 barrier_Relocation* const reloc = iter.barrier_reloc();
3880 stringStream st;
3881 st.print("barrier format=%d", reloc->format());
3882 return st.as_string();
3883 }
3884
3885 case relocInfo::type_mask: return "type_bit_mask";
3886
3887 default: {
3888 stringStream st;
3889 st.print("unknown relocInfo=%d", (int) iter.type());
3890 return st.as_string();
3891 }
3892 }
3893 }
3894 return have_one ? "other" : nullptr;
3895 }
3896
3897 // Return the last scope in (begin..end]
3898 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
3899 PcDesc* p = pc_desc_near(begin+1);
3900 if (p != nullptr && p->real_pc(this) <= end) {
3901 return new ScopeDesc(this, p);
3902 }
3903 return nullptr;
3904 }
3905
3906 const char* nmethod::nmethod_section_label(address pos) const {
3907 const char* label = nullptr;
3908 if (pos == code_begin()) label = "[Instructions begin]";
3909 if (pos == entry_point()) label = "[Entry Point]";
3910 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
3911 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]";
3912 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
3913 // Check stub_code before checking exception_handler or deopt_handler.
3914 if (pos == this->stub_begin()) label = "[Stub Code]";
3915 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
3916 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
3917 return label;
3918 }
3919
3920 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
3921 if (print_section_labels) {
3922 const char* label = nmethod_section_label(block_begin);
3923 if (label != nullptr) {
3924 stream->bol();
3925 stream->print_cr("%s", label);
3926 }
3927 }
3928
3929 if (block_begin == entry_point()) {
3930 Method* m = method();
3931 if (m != nullptr) {
3932 stream->print(" # ");
3933 m->print_value_on(stream);
3934 stream->cr();
3935 }
3936 if (m != nullptr && !is_osr_method()) {
3937 ResourceMark rm;
3938 int sizeargs = m->size_of_parameters();
3939 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
3940 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
3941 {
3942 int sig_index = 0;
3943 if (!m->is_static())
3944 sig_bt[sig_index++] = T_OBJECT; // 'this'
3945 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) {
3946 BasicType t = ss.type();
3947 sig_bt[sig_index++] = t;
3948 if (type2size[t] == 2) {
3949 sig_bt[sig_index++] = T_VOID;
3950 } else {
3951 assert(type2size[t] == 1, "size is 1 or 2");
3952 }
3953 }
3954 assert(sig_index == sizeargs, "");
3955 }
3956 const char* spname = "sp"; // make arch-specific?
3957 SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs);
3958 int stack_slot_offset = this->frame_size() * wordSize;
3959 int tab1 = 14, tab2 = 24;
3960 int sig_index = 0;
3961 int arg_index = (m->is_static() ? 0 : -1);
3962 bool did_old_sp = false;
3963 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) {
3964 bool at_this = (arg_index == -1);
3965 bool at_old_sp = false;
3966 BasicType t = (at_this ? T_OBJECT : ss.type());
3967 assert(t == sig_bt[sig_index], "sigs in sync");
3968 if (at_this)
3969 stream->print(" # this: ");
3970 else
3971 stream->print(" # parm%d: ", arg_index);
3972 stream->move_to(tab1);
3973 VMReg fst = regs[sig_index].first();
3974 VMReg snd = regs[sig_index].second();
3975 if (fst->is_reg()) {
3976 stream->print("%s", fst->name());
3977 if (snd->is_valid()) {
3978 stream->print(":%s", snd->name());
3979 }
3980 } else if (fst->is_stack()) {
3981 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
3982 if (offset == stack_slot_offset) at_old_sp = true;
3983 stream->print("[%s+0x%x]", spname, offset);
3984 } else {
3985 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
3986 }
3987 stream->print(" ");
3988 stream->move_to(tab2);
3989 stream->print("= ");
3990 if (at_this) {
3991 m->method_holder()->print_value_on(stream);
3992 } else {
3993 bool did_name = false;
3994 if (!at_this && ss.is_reference()) {
3995 Symbol* name = ss.as_symbol();
3996 name->print_value_on(stream);
3997 did_name = true;
3998 }
3999 if (!did_name)
4000 stream->print("%s", type2name(t));
4001 }
4002 if (at_old_sp) {
4003 stream->print(" (%s of caller)", spname);
4004 did_old_sp = true;
4005 }
4006 stream->cr();
4007 sig_index += type2size[t];
4008 arg_index += 1;
4009 if (!at_this) ss.next();
4010 }
4011 if (!did_old_sp) {
4012 stream->print(" # ");
4013 stream->move_to(tab1);
4014 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4015 stream->print(" (%s of caller)", spname);
4016 stream->cr();
4017 }
4018 }
4019 }
4020 }
4021
4022 // Returns whether this nmethod has code comments.
4023 bool nmethod::has_code_comment(address begin, address end) {
4024 // scopes?
4025 ScopeDesc* sd = scope_desc_in(begin, end);
4026 if (sd != nullptr) return true;
4027
4028 // relocations?
4029 const char* str = reloc_string_for(begin, end);
4030 if (str != nullptr) return true;
4031
4032 // implicit exceptions?
4033 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4034 if (cont_offset != 0) return true;
4035
4036 return false;
4037 }
4038
4039 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4040 ImplicitExceptionTable implicit_table(this);
4041 int pc_offset = (int)(begin - code_begin());
4042 int cont_offset = implicit_table.continuation_offset(pc_offset);
4043 bool oop_map_required = false;
4044 if (cont_offset != 0) {
4045 st->move_to(column, 6, 0);
4046 if (pc_offset == cont_offset) {
4047 st->print("; implicit exception: deoptimizes");
4048 oop_map_required = true;
4049 } else {
4050 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4051 }
4052 }
4053
4054 // Find an oopmap in (begin, end]. We use the odd half-closed
4055 // interval so that oop maps and scope descs which are tied to the
4056 // byte after a call are printed with the call itself. OopMaps
4057 // associated with implicit exceptions are printed with the implicit
4058 // instruction.
4059 address base = code_begin();
4060 ImmutableOopMapSet* oms = oop_maps();
4061 if (oms != nullptr) {
4062 for (int i = 0, imax = oms->count(); i < imax; i++) {
4063 const ImmutableOopMapPair* pair = oms->pair_at(i);
4064 const ImmutableOopMap* om = pair->get_from(oms);
4065 address pc = base + pair->pc_offset();
4066 if (pc >= begin) {
4067 #if INCLUDE_JVMCI
4068 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4069 #else
4070 bool is_implicit_deopt = false;
4071 #endif
4072 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4073 st->move_to(column, 6, 0);
4074 st->print("; ");
4075 om->print_on(st);
4076 oop_map_required = false;
4077 }
4078 }
4079 if (pc > end) {
4080 break;
4081 }
4082 }
4083 }
4084 assert(!oop_map_required, "missed oopmap");
4085
4086 Thread* thread = Thread::current();
4087
4088 // Print any debug info present at this pc.
4089 ScopeDesc* sd = scope_desc_in(begin, end);
4090 if (sd != nullptr) {
4091 st->move_to(column, 6, 0);
4092 if (sd->bci() == SynchronizationEntryBCI) {
4093 st->print(";*synchronization entry");
4094 } else if (sd->bci() == AfterBci) {
4095 st->print(";* method exit (unlocked if synchronized)");
4096 } else if (sd->bci() == UnwindBci) {
4097 st->print(";* unwind (locked if synchronized)");
4098 } else if (sd->bci() == AfterExceptionBci) {
4099 st->print(";* unwind (unlocked if synchronized)");
4100 } else if (sd->bci() == UnknownBci) {
4101 st->print(";* unknown");
4102 } else if (sd->bci() == InvalidFrameStateBci) {
4103 st->print(";* invalid frame state");
4104 } else {
4105 if (sd->method() == nullptr) {
4106 st->print("method is nullptr");
4107 } else if (sd->method()->is_native()) {
4108 st->print("method is native");
4109 } else {
4110 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4111 st->print(";*%s", Bytecodes::name(bc));
4112 switch (bc) {
4113 case Bytecodes::_invokevirtual:
4114 case Bytecodes::_invokespecial:
4115 case Bytecodes::_invokestatic:
4116 case Bytecodes::_invokeinterface:
4117 {
4118 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4119 st->print(" ");
4120 if (invoke.name() != nullptr)
4121 invoke.name()->print_symbol_on(st);
4122 else
4123 st->print("<UNKNOWN>");
4124 break;
4125 }
4126 case Bytecodes::_getfield:
4127 case Bytecodes::_putfield:
4128 case Bytecodes::_getstatic:
4129 case Bytecodes::_putstatic:
4130 {
4131 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4132 st->print(" ");
4133 if (field.name() != nullptr)
4134 field.name()->print_symbol_on(st);
4135 else
4136 st->print("<UNKNOWN>");
4137 }
4138 default:
4139 break;
4140 }
4141 }
4142 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop());
4143 }
4144
4145 // Print all scopes
4146 for (;sd != nullptr; sd = sd->sender()) {
4147 st->move_to(column, 6, 0);
4148 st->print("; -");
4149 if (sd->should_reexecute()) {
4150 st->print(" (reexecute)");
4151 }
4152 if (sd->method() == nullptr) {
4153 st->print("method is nullptr");
4154 } else {
4155 sd->method()->print_short_name(st);
4156 }
4157 int lineno = sd->method()->line_number_from_bci(sd->bci());
4158 if (lineno != -1) {
4159 st->print("@%d (line %d)", sd->bci(), lineno);
4160 } else {
4161 st->print("@%d", sd->bci());
4162 }
4163 st->cr();
4164 }
4165 }
4166
4167 // Print relocation information
4168 // Prevent memory leak: allocating without ResourceMark.
4169 ResourceMark rm;
4170 const char* str = reloc_string_for(begin, end);
4171 if (str != nullptr) {
4172 if (sd != nullptr) st->cr();
4173 st->move_to(column, 6, 0);
4174 st->print("; {%s}", str);
4175 }
4176 }
4177
4178 #endif
4179
4180 address nmethod::call_instruction_address(address pc) const {
4181 if (NativeCall::is_call_before(pc)) {
4182 NativeCall *ncall = nativeCall_before(pc);
4183 return ncall->instruction_address();
4184 }
4185 return nullptr;
4186 }
4187
4188 void nmethod::print_value_on_impl(outputStream* st) const {
4189 st->print_cr("nmethod");
4190 #if defined(SUPPORT_DATA_STRUCTS)
4191 print_on_with_msg(st, nullptr);
4192 #endif
4193 }
4194
4195 #ifndef PRODUCT
4196
4197 void nmethod::print_calls(outputStream* st) {
4198 RelocIterator iter(this);
4199 while (iter.next()) {
4200 switch (iter.type()) {
4201 case relocInfo::virtual_call_type: {
4202 CompiledICLocker ml_verify(this);
4203 CompiledIC_at(&iter)->print();
4204 break;
4205 }
4206 case relocInfo::static_call_type:
4207 case relocInfo::opt_virtual_call_type:
4208 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4209 CompiledDirectCall::at(iter.reloc())->print();
4210 break;
4211 default:
4212 break;
4213 }
4214 }
4215 }
4216
4217 void nmethod::print_statistics() {
4218 ttyLocker ttyl;
4219 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4220 native_nmethod_stats.print_native_nmethod_stats();
4221 #ifdef COMPILER1
4222 c1_java_nmethod_stats.print_nmethod_stats("C1");
4223 #endif
4224 #ifdef COMPILER2
4225 c2_java_nmethod_stats.print_nmethod_stats("C2");
4226 #endif
4227 #if INCLUDE_JVMCI
4228 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4229 #endif
4230 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4231 DebugInformationRecorder::print_statistics();
4232 pc_nmethod_stats.print_pc_stats();
4233 Dependencies::print_statistics();
4234 ExternalsRecorder::print_statistics();
4235 if (xtty != nullptr) xtty->tail("statistics");
4236 }
4237
4238 #endif // !PRODUCT
4239
4240 #if INCLUDE_JVMCI
4241 void nmethod::update_speculation(JavaThread* thread) {
4242 jlong speculation = thread->pending_failed_speculation();
4243 if (speculation != 0) {
4244 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4245 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4246 thread->set_pending_failed_speculation(0);
4247 }
4248 }
4249
4250 const char* nmethod::jvmci_name() {
4251 if (jvmci_nmethod_data() != nullptr) {
4252 return jvmci_nmethod_data()->name();
4253 }
4254 return nullptr;
4255 }
4256 #endif
4257
4258 void nmethod::prepare_for_archiving() {
4259 CodeBlob::prepare_for_archiving();
4260 _deoptimization_generation = 0;
4261 _gc_epoch = 0;
4262 _method_profiling_count = 0;
4263 _osr_link = nullptr;
4264 _method = nullptr;
4265 _immutable_data = nullptr;
4266 _pc_desc_container = nullptr;
4267 _exception_cache = nullptr;
4268 _gc_data = nullptr;
4269 _oops_do_mark_link = nullptr;
4270 _compiled_ic_data = nullptr;
4271 _osr_entry_point = nullptr;
4272 _compile_id = -1;
4273 _deoptimization_status = not_marked;
4274 _is_unloading_state = 0;
4275 _state = not_installed;
4276 }