1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "asm/assembler.inline.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/compiledIC.hpp"
29 #include "code/dependencies.hpp"
30 #include "code/nativeInst.hpp"
31 #include "code/nmethod.inline.hpp"
32 #include "code/scopeDesc.hpp"
33 #include "compiler/abstractCompiler.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerDirectives.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/compileTask.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "compiler/disassembler.hpp"
42 #include "compiler/oopMap.inline.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/barrierSetNMethod.hpp"
45 #include "gc/shared/classUnloadingContext.hpp"
46 #include "gc/shared/collectedHeap.hpp"
47 #include "interpreter/bytecode.inline.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/access.inline.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/method.inline.hpp"
57 #include "oops/methodData.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/weakHandle.inline.hpp"
60 #include "prims/jvmtiImpl.hpp"
61 #include "prims/jvmtiThreadState.hpp"
62 #include "prims/methodHandles.hpp"
63 #include "runtime/atomicAccess.hpp"
64 #include "runtime/continuation.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/flags/flagSetting.hpp"
67 #include "runtime/frame.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/orderAccess.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/serviceThread.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/threadWXSetters.inline.hpp"
77 #include "runtime/vmThread.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/dtrace.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/hashTable.hpp"
84 #include "utilities/xmlstream.hpp"
85 #if INCLUDE_JVMCI
86 #include "jvmci/jvmciRuntime.hpp"
87 #endif
88
89 #ifdef DTRACE_ENABLED
90
91 // Only bother with this argument setup if dtrace is available
92
93 #define DTRACE_METHOD_UNLOAD_PROBE(method) \
94 { \
95 Method* m = (method); \
96 if (m != nullptr) { \
97 Symbol* klass_name = m->klass_name(); \
98 Symbol* name = m->name(); \
99 Symbol* signature = m->signature(); \
100 HOTSPOT_COMPILED_METHOD_UNLOAD( \
101 (char *) klass_name->bytes(), klass_name->utf8_length(), \
102 (char *) name->bytes(), name->utf8_length(), \
103 (char *) signature->bytes(), signature->utf8_length()); \
104 } \
105 }
106
107 #else // ndef DTRACE_ENABLED
108
109 #define DTRACE_METHOD_UNLOAD_PROBE(method)
110
111 #endif
112
113 // Cast from int value to narrow type
114 #define CHECKED_CAST(result, T, thing) \
115 result = static_cast<T>(thing); \
116 guarantee(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing);
117
118 //---------------------------------------------------------------------------------
119 // NMethod statistics
120 // They are printed under various flags, including:
121 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation.
122 // (In the latter two cases, they like other stats are printed to the log only.)
123
124 #ifndef PRODUCT
125 // These variables are put into one block to reduce relocations
126 // and make it simpler to print from the debugger.
127 struct java_nmethod_stats_struct {
128 uint nmethod_count;
129 uint total_nm_size;
130 uint total_immut_size;
131 uint total_mut_size;
132 uint relocation_size;
133 uint consts_size;
134 uint insts_size;
135 uint stub_size;
136 uint oops_size;
137 uint metadata_size;
138 uint dependencies_size;
139 uint nul_chk_table_size;
140 uint handler_table_size;
141 uint scopes_pcs_size;
142 uint scopes_data_size;
143 #if INCLUDE_JVMCI
144 uint speculations_size;
145 uint jvmci_data_size;
146 #endif
147
148 void note_nmethod(nmethod* nm) {
149 nmethod_count += 1;
150 total_nm_size += nm->size();
151 total_immut_size += nm->immutable_data_size();
152 total_mut_size += nm->mutable_data_size();
153 relocation_size += nm->relocation_size();
154 consts_size += nm->consts_size();
155 insts_size += nm->insts_size();
156 stub_size += nm->stub_size();
157 oops_size += nm->oops_size();
158 metadata_size += nm->metadata_size();
159 scopes_data_size += nm->scopes_data_size();
160 scopes_pcs_size += nm->scopes_pcs_size();
161 dependencies_size += nm->dependencies_size();
162 handler_table_size += nm->handler_table_size();
163 nul_chk_table_size += nm->nul_chk_table_size();
164 #if INCLUDE_JVMCI
165 speculations_size += nm->speculations_size();
166 jvmci_data_size += nm->jvmci_data_size();
167 #endif
168 }
169 void print_nmethod_stats(const char* name) {
170 if (nmethod_count == 0) return;
171 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name);
172 uint total_size = total_nm_size + total_immut_size + total_mut_size;
173 if (total_nm_size != 0) {
174 tty->print_cr(" total size = %u (100%%)", total_size);
175 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size);
176 }
177 uint header_size = (uint)(nmethod_count * sizeof(nmethod));
178 if (nmethod_count != 0) {
179 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size);
180 }
181 if (consts_size != 0) {
182 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size);
183 }
184 if (insts_size != 0) {
185 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size);
186 }
187 if (stub_size != 0) {
188 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size);
189 }
190 if (oops_size != 0) {
191 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size);
192 }
193 if (total_mut_size != 0) {
194 tty->print_cr(" mutable data = %u (%f%%)", total_mut_size, (total_mut_size * 100.0f)/total_size);
195 }
196 if (relocation_size != 0) {
197 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_mut_size);
198 }
199 if (metadata_size != 0) {
200 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_mut_size);
201 }
202 #if INCLUDE_JVMCI
203 if (jvmci_data_size != 0) {
204 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_mut_size);
205 }
206 #endif
207 if (total_immut_size != 0) {
208 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size);
209 }
210 if (dependencies_size != 0) {
211 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size);
212 }
213 if (nul_chk_table_size != 0) {
214 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size);
215 }
216 if (handler_table_size != 0) {
217 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size);
218 }
219 if (scopes_pcs_size != 0) {
220 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size);
221 }
222 if (scopes_data_size != 0) {
223 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size);
224 }
225 #if INCLUDE_JVMCI
226 if (speculations_size != 0) {
227 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size);
228 }
229 #endif
230 }
231 };
232
233 struct native_nmethod_stats_struct {
234 uint native_nmethod_count;
235 uint native_total_size;
236 uint native_relocation_size;
237 uint native_insts_size;
238 uint native_oops_size;
239 uint native_metadata_size;
240 void note_native_nmethod(nmethod* nm) {
241 native_nmethod_count += 1;
242 native_total_size += nm->size();
243 native_relocation_size += nm->relocation_size();
244 native_insts_size += nm->insts_size();
245 native_oops_size += nm->oops_size();
246 native_metadata_size += nm->metadata_size();
247 }
248 void print_native_nmethod_stats() {
249 if (native_nmethod_count == 0) return;
250 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count);
251 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size);
252 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size);
253 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size);
254 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size);
255 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size);
256 }
257 };
258
259 struct pc_nmethod_stats_struct {
260 uint pc_desc_init; // number of initialization of cache (= number of caches)
261 uint pc_desc_queries; // queries to nmethod::find_pc_desc
262 uint pc_desc_approx; // number of those which have approximate true
263 uint pc_desc_repeats; // number of _pc_descs[0] hits
264 uint pc_desc_hits; // number of LRU cache hits
265 uint pc_desc_tests; // total number of PcDesc examinations
266 uint pc_desc_searches; // total number of quasi-binary search steps
267 uint pc_desc_adds; // number of LUR cache insertions
268
269 void print_pc_stats() {
270 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query",
271 pc_desc_queries,
272 (double)(pc_desc_tests + pc_desc_searches)
273 / pc_desc_queries);
274 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u",
275 pc_desc_init,
276 pc_desc_queries, pc_desc_approx,
277 pc_desc_repeats, pc_desc_hits,
278 pc_desc_tests, pc_desc_searches, pc_desc_adds);
279 }
280 };
281
282 #ifdef COMPILER1
283 static java_nmethod_stats_struct c1_java_nmethod_stats;
284 #endif
285 #ifdef COMPILER2
286 static java_nmethod_stats_struct c2_java_nmethod_stats;
287 #endif
288 #if INCLUDE_JVMCI
289 static java_nmethod_stats_struct jvmci_java_nmethod_stats;
290 #endif
291 static java_nmethod_stats_struct unknown_java_nmethod_stats;
292
293 static native_nmethod_stats_struct native_nmethod_stats;
294 static pc_nmethod_stats_struct pc_nmethod_stats;
295
296 static void note_java_nmethod(nmethod* nm) {
297 #ifdef COMPILER1
298 if (nm->is_compiled_by_c1()) {
299 c1_java_nmethod_stats.note_nmethod(nm);
300 } else
301 #endif
302 #ifdef COMPILER2
303 if (nm->is_compiled_by_c2()) {
304 c2_java_nmethod_stats.note_nmethod(nm);
305 } else
306 #endif
307 #if INCLUDE_JVMCI
308 if (nm->is_compiled_by_jvmci()) {
309 jvmci_java_nmethod_stats.note_nmethod(nm);
310 } else
311 #endif
312 {
313 unknown_java_nmethod_stats.note_nmethod(nm);
314 }
315 }
316 #endif // !PRODUCT
317
318 //---------------------------------------------------------------------------------
319
320
321 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) {
322 assert(pc != nullptr, "Must be non null");
323 assert(exception.not_null(), "Must be non null");
324 assert(handler != nullptr, "Must be non null");
325
326 _count = 0;
327 _exception_type = exception->klass();
328 _next = nullptr;
329 _purge_list_next = nullptr;
330
331 add_address_and_handler(pc,handler);
332 }
333
334
335 address ExceptionCache::match(Handle exception, address pc) {
336 assert(pc != nullptr,"Must be non null");
337 assert(exception.not_null(),"Must be non null");
338 if (exception->klass() == exception_type()) {
339 return (test_address(pc));
340 }
341
342 return nullptr;
343 }
344
345
346 bool ExceptionCache::match_exception_with_space(Handle exception) {
347 assert(exception.not_null(),"Must be non null");
348 if (exception->klass() == exception_type() && count() < cache_size) {
349 return true;
350 }
351 return false;
352 }
353
354
355 address ExceptionCache::test_address(address addr) {
356 int limit = count();
357 for (int i = 0; i < limit; i++) {
358 if (pc_at(i) == addr) {
359 return handler_at(i);
360 }
361 }
362 return nullptr;
363 }
364
365
366 bool ExceptionCache::add_address_and_handler(address addr, address handler) {
367 if (test_address(addr) == handler) return true;
368
369 int index = count();
370 if (index < cache_size) {
371 set_pc_at(index, addr);
372 set_handler_at(index, handler);
373 increment_count();
374 return true;
375 }
376 return false;
377 }
378
379 ExceptionCache* ExceptionCache::next() {
380 return AtomicAccess::load(&_next);
381 }
382
383 void ExceptionCache::set_next(ExceptionCache *ec) {
384 AtomicAccess::store(&_next, ec);
385 }
386
387 //-----------------------------------------------------------------------------
388
389
390 // Helper used by both find_pc_desc methods.
391 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) {
392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests);
393 if (!approximate) {
394 return pc->pc_offset() == pc_offset;
395 } else {
396 // Do not look before the sentinel
397 assert(pc_offset > PcDesc::lower_offset_limit, "illegal pc_offset");
398 return pc_offset <= pc->pc_offset() && (pc-1)->pc_offset() < pc_offset;
399 }
400 }
401
402 void PcDescCache::init_to(PcDesc* initial_pc_desc) {
403 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init);
404 // initialize the cache by filling it with benign (non-null) values
405 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit,
406 "must start with a sentinel");
407 for (int i = 0; i < cache_size; i++) {
408 _pc_descs[i] = initial_pc_desc;
409 }
410 }
411
412 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) {
413 // Note: one might think that caching the most recently
414 // read value separately would be a win, but one would be
415 // wrong. When many threads are updating it, the cache
416 // line it's in would bounce between caches, negating
417 // any benefit.
418
419 // In order to prevent race conditions do not load cache elements
420 // repeatedly, but use a local copy:
421 PcDesc* res;
422
423 // Step one: Check the most recently added value.
424 res = _pc_descs[0];
425 assert(res != nullptr, "PcDesc cache should be initialized already");
426
427 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case.
428 if (approximate && match_desc(res, pc_offset, approximate)) {
429 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats);
430 return res;
431 }
432
433 // Step two: Check the rest of the LRU cache.
434 for (int i = 1; i < cache_size; ++i) {
435 res = _pc_descs[i];
436 if (res->pc_offset() < 0) break; // optimization: skip empty cache
437 if (match_desc(res, pc_offset, approximate)) {
438 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits);
439 return res;
440 }
441 }
442
443 // Report failure.
444 return nullptr;
445 }
446
447 void PcDescCache::add_pc_desc(PcDesc* pc_desc) {
448 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds);
449 // Update the LRU cache by shifting pc_desc forward.
450 for (int i = 0; i < cache_size; i++) {
451 PcDesc* next = _pc_descs[i];
452 _pc_descs[i] = pc_desc;
453 pc_desc = next;
454 }
455 }
456
457 // adjust pcs_size so that it is a multiple of both oopSize and
458 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple
459 // of oopSize, then 2*sizeof(PcDesc) is)
460 static int adjust_pcs_size(int pcs_size) {
461 int nsize = align_up(pcs_size, oopSize);
462 if ((nsize % sizeof(PcDesc)) != 0) {
463 nsize = pcs_size + sizeof(PcDesc);
464 }
465 assert((nsize % oopSize) == 0, "correct alignment");
466 return nsize;
467 }
468
469 // Returns a string version of the method state.
470 const char* nmethod::state() const {
471 int state = get_state();
472 switch (state) {
473 case not_installed:
474 return "not installed";
475 case in_use:
476 return "in use";
477 case not_entrant:
478 return "not_entrant";
479 default:
480 fatal("unexpected method state: %d", state);
481 return nullptr;
482 }
483 }
484
485 void nmethod::set_deoptimized_done() {
486 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
487 if (_deoptimization_status != deoptimize_done) { // can't go backwards
488 AtomicAccess::store(&_deoptimization_status, deoptimize_done);
489 }
490 }
491
492 ExceptionCache* nmethod::exception_cache_acquire() const {
493 return AtomicAccess::load_acquire(&_exception_cache);
494 }
495
496 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) {
497 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock");
498 assert(new_entry != nullptr,"Must be non null");
499 assert(new_entry->next() == nullptr, "Must be null");
500
501 for (;;) {
502 ExceptionCache *ec = exception_cache();
503 if (ec != nullptr) {
504 Klass* ex_klass = ec->exception_type();
505 if (!ex_klass->is_loader_alive()) {
506 // We must guarantee that entries are not inserted with new next pointer
507 // edges to ExceptionCache entries with dead klasses, due to bad interactions
508 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll
509 // the head pointer forward to the first live ExceptionCache, so that the new
510 // next pointers always point at live ExceptionCaches, that are not removed due
511 // to concurrent ExceptionCache cleanup.
512 ExceptionCache* next = ec->next();
513 if (AtomicAccess::cmpxchg(&_exception_cache, ec, next) == ec) {
514 CodeCache::release_exception_cache(ec);
515 }
516 continue;
517 }
518 ec = exception_cache();
519 if (ec != nullptr) {
520 new_entry->set_next(ec);
521 }
522 }
523 if (AtomicAccess::cmpxchg(&_exception_cache, ec, new_entry) == ec) {
524 return;
525 }
526 }
527 }
528
529 void nmethod::clean_exception_cache() {
530 // For each nmethod, only a single thread may call this cleanup function
531 // at the same time, whether called in STW cleanup or concurrent cleanup.
532 // Note that if the GC is processing exception cache cleaning in a concurrent phase,
533 // then a single writer may contend with cleaning up the head pointer to the
534 // first ExceptionCache node that has a Klass* that is alive. That is fine,
535 // as long as there is no concurrent cleanup of next pointers from concurrent writers.
536 // And the concurrent writers do not clean up next pointers, only the head.
537 // Also note that concurrent readers will walk through Klass* pointers that are not
538 // alive. That does not cause ABA problems, because Klass* is deleted after
539 // a handshake with all threads, after all stale ExceptionCaches have been
540 // unlinked. That is also when the CodeCache::exception_cache_purge_list()
541 // is deleted, with all ExceptionCache entries that were cleaned concurrently.
542 // That similarly implies that CAS operations on ExceptionCache entries do not
543 // suffer from ABA problems as unlinking and deletion is separated by a global
544 // handshake operation.
545 ExceptionCache* prev = nullptr;
546 ExceptionCache* curr = exception_cache_acquire();
547
548 while (curr != nullptr) {
549 ExceptionCache* next = curr->next();
550
551 if (!curr->exception_type()->is_loader_alive()) {
552 if (prev == nullptr) {
553 // Try to clean head; this is contended by concurrent inserts, that
554 // both lazily clean the head, and insert entries at the head. If
555 // the CAS fails, the operation is restarted.
556 if (AtomicAccess::cmpxchg(&_exception_cache, curr, next) != curr) {
557 prev = nullptr;
558 curr = exception_cache_acquire();
559 continue;
560 }
561 } else {
562 // It is impossible to during cleanup connect the next pointer to
563 // an ExceptionCache that has not been published before a safepoint
564 // prior to the cleanup. Therefore, release is not required.
565 prev->set_next(next);
566 }
567 // prev stays the same.
568
569 CodeCache::release_exception_cache(curr);
570 } else {
571 prev = curr;
572 }
573
574 curr = next;
575 }
576 }
577
578 // public method for accessing the exception cache
579 // These are the public access methods.
580 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) {
581 // We never grab a lock to read the exception cache, so we may
582 // have false negatives. This is okay, as it can only happen during
583 // the first few exception lookups for a given nmethod.
584 ExceptionCache* ec = exception_cache_acquire();
585 while (ec != nullptr) {
586 address ret_val;
587 if ((ret_val = ec->match(exception,pc)) != nullptr) {
588 return ret_val;
589 }
590 ec = ec->next();
591 }
592 return nullptr;
593 }
594
595 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) {
596 // There are potential race conditions during exception cache updates, so we
597 // must own the ExceptionCache_lock before doing ANY modifications. Because
598 // we don't lock during reads, it is possible to have several threads attempt
599 // to update the cache with the same data. We need to check for already inserted
600 // copies of the current data before adding it.
601
602 MutexLocker ml(ExceptionCache_lock);
603 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception);
604
605 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) {
606 target_entry = new ExceptionCache(exception,pc,handler);
607 add_exception_cache_entry(target_entry);
608 }
609 }
610
611 // private method for handling exception cache
612 // These methods are private, and used to manipulate the exception cache
613 // directly.
614 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) {
615 ExceptionCache* ec = exception_cache_acquire();
616 while (ec != nullptr) {
617 if (ec->match_exception_with_space(exception)) {
618 return ec;
619 }
620 ec = ec->next();
621 }
622 return nullptr;
623 }
624
625 bool nmethod::is_at_poll_return(address pc) {
626 RelocIterator iter(this, pc, pc+1);
627 while (iter.next()) {
628 if (iter.type() == relocInfo::poll_return_type)
629 return true;
630 }
631 return false;
632 }
633
634
635 bool nmethod::is_at_poll_or_poll_return(address pc) {
636 RelocIterator iter(this, pc, pc+1);
637 while (iter.next()) {
638 relocInfo::relocType t = iter.type();
639 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type)
640 return true;
641 }
642 return false;
643 }
644
645 void nmethod::verify_oop_relocations() {
646 // Ensure sure that the code matches the current oop values
647 RelocIterator iter(this, nullptr, nullptr);
648 while (iter.next()) {
649 if (iter.type() == relocInfo::oop_type) {
650 oop_Relocation* reloc = iter.oop_reloc();
651 if (!reloc->oop_is_immediate()) {
652 reloc->verify_oop_relocation();
653 }
654 }
655 }
656 }
657
658
659 ScopeDesc* nmethod::scope_desc_at(address pc) {
660 PcDesc* pd = pc_desc_at(pc);
661 guarantee(pd != nullptr, "scope must be present");
662 return new ScopeDesc(this, pd);
663 }
664
665 ScopeDesc* nmethod::scope_desc_near(address pc) {
666 PcDesc* pd = pc_desc_near(pc);
667 guarantee(pd != nullptr, "scope must be present");
668 return new ScopeDesc(this, pd);
669 }
670
671 address nmethod::oops_reloc_begin() const {
672 // If the method is not entrant then a JMP is plastered over the
673 // first few bytes. If an oop in the old code was there, that oop
674 // should not get GC'd. Skip the first few bytes of oops on
675 // not-entrant methods.
676 if (frame_complete_offset() != CodeOffsets::frame_never_safe &&
677 code_begin() + frame_complete_offset() >
678 verified_entry_point() + NativeJump::instruction_size)
679 {
680 // If we have a frame_complete_offset after the native jump, then there
681 // is no point trying to look for oops before that. This is a requirement
682 // for being allowed to scan oops concurrently.
683 return code_begin() + frame_complete_offset();
684 }
685
686 address low_boundary = verified_entry_point();
687 return low_boundary;
688 }
689
690 // Method that knows how to preserve outgoing arguments at call. This method must be
691 // called with a frame corresponding to a Java invoke
692 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) {
693 if (method() == nullptr) {
694 return;
695 }
696
697 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee
698 JavaThread* thread = reg_map->thread();
699 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp())
700 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) {
701 return;
702 }
703
704 if (!method()->is_native()) {
705 address pc = fr.pc();
706 bool has_receiver, has_appendix;
707 Symbol* signature;
708
709 // The method attached by JIT-compilers should be used, if present.
710 // Bytecode can be inaccurate in such case.
711 Method* callee = attached_method_before_pc(pc);
712 if (callee != nullptr) {
713 has_receiver = !(callee->access_flags().is_static());
714 has_appendix = false;
715 signature = callee->signature();
716
717 // If inline types are passed as fields, use the extended signature
718 // which contains the types of all (oop) fields of the inline type.
719 if (is_compiled_by_c2() && callee->has_scalarized_args()) {
720 const GrowableArray<SigEntry>* sig = callee->adapter()->get_sig_cc();
721 assert(sig != nullptr, "sig should never be null");
722 TempNewSymbol tmp_sig = SigEntry::create_symbol(sig);
723 has_receiver = false; // The extended signature contains the receiver type
724 fr.oops_compiled_arguments_do(tmp_sig, has_receiver, has_appendix, reg_map, f);
725 return;
726 }
727 } else {
728 SimpleScopeDesc ssd(this, pc);
729
730 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci());
731 has_receiver = call.has_receiver();
732 has_appendix = call.has_appendix();
733 signature = call.signature();
734 }
735
736 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f);
737 } else if (method()->is_continuation_enter_intrinsic()) {
738 // This method only calls Continuation.enter()
739 Symbol* signature = vmSymbols::continuationEnter_signature();
740 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f);
741 }
742 }
743
744 Method* nmethod::attached_method(address call_instr) {
745 assert(code_contains(call_instr), "not part of the nmethod");
746 RelocIterator iter(this, call_instr, call_instr + 1);
747 while (iter.next()) {
748 if (iter.addr() == call_instr) {
749 switch(iter.type()) {
750 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value();
751 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value();
752 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value();
753 default: break;
754 }
755 }
756 }
757 return nullptr; // not found
758 }
759
760 Method* nmethod::attached_method_before_pc(address pc) {
761 if (NativeCall::is_call_before(pc)) {
762 NativeCall* ncall = nativeCall_before(pc);
763 return attached_method(ncall->instruction_address());
764 }
765 return nullptr; // not a call
766 }
767
768 void nmethod::clear_inline_caches() {
769 assert(SafepointSynchronize::is_at_safepoint() || (NMethodState_lock->owned_by_self() && is_not_installed()), "clearing of IC's only allowed at safepoint or when not installed");
770 RelocIterator iter(this);
771 while (iter.next()) {
772 iter.reloc()->clear_inline_cache();
773 }
774 }
775
776 #ifdef ASSERT
777 // Check class_loader is alive for this bit of metadata.
778 class CheckClass : public MetadataClosure {
779 void do_metadata(Metadata* md) {
780 Klass* klass = nullptr;
781 if (md->is_klass()) {
782 klass = ((Klass*)md);
783 } else if (md->is_method()) {
784 klass = ((Method*)md)->method_holder();
785 } else if (md->is_methodData()) {
786 klass = ((MethodData*)md)->method()->method_holder();
787 } else if (md->is_methodCounters()) {
788 klass = ((MethodCounters*)md)->method()->method_holder();
789 } else {
790 md->print();
791 ShouldNotReachHere();
792 }
793 assert(klass->is_loader_alive(), "must be alive");
794 }
795 };
796 #endif // ASSERT
797
798 // Clean references to unloaded nmethods at addr from this one, which is not unloaded.
799 template <typename CallsiteT>
800 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, bool clean_all) {
801 CodeBlob* cb = CodeCache::find_blob(callsite->destination());
802 if (!cb->is_nmethod()) {
803 return;
804 }
805 nmethod* nm = cb->as_nmethod();
806 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
807 callsite->set_to_clean();
808 }
809 }
810
811 // Cleans caches in nmethods that point to either classes that are unloaded
812 // or nmethods that are unloaded.
813 //
814 // Can be called either in parallel by G1 currently or after all
815 // nmethods are unloaded. Return postponed=true in the parallel case for
816 // inline caches found that point to nmethods that are not yet visited during
817 // the do_unloading walk.
818 void nmethod::unload_nmethod_caches(bool unloading_occurred) {
819 ResourceMark rm;
820
821 // Exception cache only needs to be called if unloading occurred
822 if (unloading_occurred) {
823 clean_exception_cache();
824 }
825
826 cleanup_inline_caches_impl(unloading_occurred, false);
827
828 #ifdef ASSERT
829 // Check that the metadata embedded in the nmethod is alive
830 CheckClass check_class;
831 metadata_do(&check_class);
832 #endif
833 }
834
835 void nmethod::run_nmethod_entry_barrier() {
836 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
837 if (bs_nm != nullptr) {
838 // We want to keep an invariant that nmethods found through iterations of a Thread's
839 // nmethods found in safepoints have gone through an entry barrier and are not armed.
840 // By calling this nmethod entry barrier, it plays along and acts
841 // like any other nmethod found on the stack of a thread (fewer surprises).
842 nmethod* nm = this;
843 bool alive = bs_nm->nmethod_entry_barrier(nm);
844 assert(alive, "should be alive");
845 }
846 }
847
848 // Only called by whitebox test
849 void nmethod::cleanup_inline_caches_whitebox() {
850 assert_locked_or_safepoint(CodeCache_lock);
851 CompiledICLocker ic_locker(this);
852 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */);
853 }
854
855 address* nmethod::orig_pc_addr(const frame* fr) {
856 return (address*) ((address)fr->unextended_sp() + orig_pc_offset());
857 }
858
859 // Called to clean up after class unloading for live nmethods
860 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) {
861 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
862 ResourceMark rm;
863
864 // Find all calls in an nmethod and clear the ones that point to bad nmethods.
865 RelocIterator iter(this, oops_reloc_begin());
866 bool is_in_static_stub = false;
867 while(iter.next()) {
868
869 switch (iter.type()) {
870
871 case relocInfo::virtual_call_type:
872 if (unloading_occurred) {
873 // If class unloading occurred we first clear ICs where the cached metadata
874 // is referring to an unloaded klass or method.
875 CompiledIC_at(&iter)->clean_metadata();
876 }
877
878 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), clean_all);
879 break;
880
881 case relocInfo::opt_virtual_call_type:
882 case relocInfo::static_call_type:
883 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), clean_all);
884 break;
885
886 case relocInfo::static_stub_type: {
887 is_in_static_stub = true;
888 break;
889 }
890
891 case relocInfo::metadata_type: {
892 // Only the metadata relocations contained in static/opt virtual call stubs
893 // contains the Method* passed to c2i adapters. It is the only metadata
894 // relocation that needs to be walked, as it is the one metadata relocation
895 // that violates the invariant that all metadata relocations have an oop
896 // in the compiled method (due to deferred resolution and code patching).
897
898 // This causes dead metadata to remain in compiled methods that are not
899 // unloading. Unless these slippery metadata relocations of the static
900 // stubs are at least cleared, subsequent class redefinition operations
901 // will access potentially free memory, and JavaThread execution
902 // concurrent to class unloading may call c2i adapters with dead methods.
903 if (!is_in_static_stub) {
904 // The first metadata relocation after a static stub relocation is the
905 // metadata relocation of the static stub used to pass the Method* to
906 // c2i adapters.
907 continue;
908 }
909 is_in_static_stub = false;
910 if (is_unloading()) {
911 // If the nmethod itself is dying, then it may point at dead metadata.
912 // Nobody should follow that metadata; it is strictly unsafe.
913 continue;
914 }
915 metadata_Relocation* r = iter.metadata_reloc();
916 Metadata* md = r->metadata_value();
917 if (md != nullptr && md->is_method()) {
918 Method* method = static_cast<Method*>(md);
919 if (!method->method_holder()->is_loader_alive()) {
920 AtomicAccess::store(r->metadata_addr(), (Method*)nullptr);
921
922 if (!r->metadata_is_immediate()) {
923 r->fix_metadata_relocation();
924 }
925 }
926 }
927 break;
928 }
929
930 default:
931 break;
932 }
933 }
934 }
935
936 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) {
937 // Exception happened outside inline-cache check code => we are inside
938 // an active nmethod => use cpc to determine a return address
939 int exception_offset = int(pc - code_begin());
940 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset );
941 #ifdef ASSERT
942 if (cont_offset == 0) {
943 Thread* thread = Thread::current();
944 ResourceMark rm(thread);
945 CodeBlob* cb = CodeCache::find_blob(pc);
946 assert(cb != nullptr && cb == this, "");
947
948 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once.
949 stringStream ss;
950 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc));
951 print_on(&ss);
952 method()->print_codes_on(&ss);
953 print_code_on(&ss);
954 print_pcs_on(&ss);
955 tty->print("%s", ss.as_string()); // print all at once
956 }
957 #endif
958 if (cont_offset == 0) {
959 // Let the normal error handling report the exception
960 return nullptr;
961 }
962 if (cont_offset == exception_offset) {
963 #if INCLUDE_JVMCI
964 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check;
965 JavaThread *thread = JavaThread::current();
966 thread->set_jvmci_implicit_exception_pc(pc);
967 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason,
968 Deoptimization::Action_reinterpret));
969 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap());
970 #else
971 ShouldNotReachHere();
972 #endif
973 }
974 return code_begin() + cont_offset;
975 }
976
977 class HasEvolDependency : public MetadataClosure {
978 bool _has_evol_dependency;
979 public:
980 HasEvolDependency() : _has_evol_dependency(false) {}
981 void do_metadata(Metadata* md) {
982 if (md->is_method()) {
983 Method* method = (Method*)md;
984 if (method->is_old()) {
985 _has_evol_dependency = true;
986 }
987 }
988 }
989 bool has_evol_dependency() const { return _has_evol_dependency; }
990 };
991
992 bool nmethod::has_evol_metadata() {
993 // Check the metadata in relocIter and CompiledIC and also deoptimize
994 // any nmethod that has reference to old methods.
995 HasEvolDependency check_evol;
996 metadata_do(&check_evol);
997 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) {
998 ResourceMark rm;
999 log_debug(redefine, class, nmethod)
1000 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata",
1001 _method->method_holder()->external_name(),
1002 _method->name()->as_C_string(),
1003 _method->signature()->as_C_string(),
1004 compile_id());
1005 }
1006 return check_evol.has_evol_dependency();
1007 }
1008
1009 int nmethod::total_size() const {
1010 return
1011 consts_size() +
1012 insts_size() +
1013 stub_size() +
1014 scopes_data_size() +
1015 scopes_pcs_size() +
1016 handler_table_size() +
1017 nul_chk_table_size();
1018 }
1019
1020 const char* nmethod::compile_kind() const {
1021 if (is_osr_method()) return "osr";
1022 if (method() != nullptr && is_native_method()) {
1023 if (method()->is_continuation_native_intrinsic()) {
1024 return "cnt";
1025 }
1026 return "c2n";
1027 }
1028 return nullptr;
1029 }
1030
1031 const char* nmethod::compiler_name() const {
1032 return compilertype2name(_compiler_type);
1033 }
1034
1035 #ifdef ASSERT
1036 class CheckForOopsClosure : public OopClosure {
1037 bool _found_oop = false;
1038 public:
1039 virtual void do_oop(oop* o) { _found_oop = true; }
1040 virtual void do_oop(narrowOop* o) { _found_oop = true; }
1041 bool found_oop() { return _found_oop; }
1042 };
1043 class CheckForMetadataClosure : public MetadataClosure {
1044 bool _found_metadata = false;
1045 Metadata* _ignore = nullptr;
1046 public:
1047 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {}
1048 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; }
1049 bool found_metadata() { return _found_metadata; }
1050 };
1051
1052 static void assert_no_oops_or_metadata(nmethod* nm) {
1053 if (nm == nullptr) return;
1054 assert(nm->oop_maps() == nullptr, "expectation");
1055
1056 CheckForOopsClosure cfo;
1057 nm->oops_do(&cfo);
1058 assert(!cfo.found_oop(), "no oops allowed");
1059
1060 // We allow an exception for the own Method, but require its class to be permanent.
1061 Method* own_method = nm->method();
1062 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method);
1063 nm->metadata_do(&cfm);
1064 assert(!cfm.found_metadata(), "no metadata allowed");
1065
1066 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(),
1067 "Method's class needs to be permanent");
1068 }
1069 #endif
1070
1071 static int required_mutable_data_size(CodeBuffer* code_buffer,
1072 int jvmci_data_size = 0) {
1073 return align_up(code_buffer->total_relocation_size(), oopSize) +
1074 align_up(code_buffer->total_metadata_size(), oopSize) +
1075 align_up(jvmci_data_size, oopSize);
1076 }
1077
1078 nmethod* nmethod::new_native_nmethod(const methodHandle& method,
1079 int compile_id,
1080 CodeBuffer *code_buffer,
1081 int vep_offset,
1082 int frame_complete,
1083 int frame_size,
1084 ByteSize basic_lock_owner_sp_offset,
1085 ByteSize basic_lock_sp_offset,
1086 OopMapSet* oop_maps,
1087 int exception_handler) {
1088 code_buffer->finalize_oop_references(method);
1089 // create nmethod
1090 nmethod* nm = nullptr;
1091 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1092 {
1093 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1094
1095 CodeOffsets offsets;
1096 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset);
1097 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete);
1098 if (exception_handler != -1) {
1099 offsets.set_value(CodeOffsets::Exceptions, exception_handler);
1100 }
1101
1102 int mutable_data_size = required_mutable_data_size(code_buffer);
1103
1104 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space.
1105 // IsUnloadingBehaviour::is_unloading needs to handle them separately.
1106 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space();
1107 nm = new (native_nmethod_size, allow_NonNMethod_space)
1108 nmethod(method(), compiler_none, native_nmethod_size,
1109 compile_id, &offsets,
1110 code_buffer, frame_size,
1111 basic_lock_owner_sp_offset,
1112 basic_lock_sp_offset,
1113 oop_maps, mutable_data_size);
1114 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); )
1115 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm));
1116 }
1117
1118 if (nm != nullptr) {
1119 // verify nmethod
1120 DEBUG_ONLY(nm->verify();) // might block
1121
1122 nm->log_new_nmethod();
1123 }
1124 return nm;
1125 }
1126
1127 nmethod* nmethod::new_nmethod(const methodHandle& method,
1128 int compile_id,
1129 int entry_bci,
1130 CodeOffsets* offsets,
1131 int orig_pc_offset,
1132 DebugInformationRecorder* debug_info,
1133 Dependencies* dependencies,
1134 CodeBuffer* code_buffer, int frame_size,
1135 OopMapSet* oop_maps,
1136 ExceptionHandlerTable* handler_table,
1137 ImplicitExceptionTable* nul_chk_table,
1138 AbstractCompiler* compiler,
1139 CompLevel comp_level
1140 #if INCLUDE_JVMCI
1141 , char* speculations,
1142 int speculations_len,
1143 JVMCINMethodData* jvmci_data
1144 #endif
1145 )
1146 {
1147 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1148 code_buffer->finalize_oop_references(method);
1149 // create nmethod
1150 nmethod* nm = nullptr;
1151 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod));
1152
1153 int immutable_data_size =
1154 adjust_pcs_size(debug_info->pcs_size())
1155 + align_up((int)dependencies->size_in_bytes(), oopSize)
1156 + align_up(handler_table->size_in_bytes() , oopSize)
1157 + align_up(nul_chk_table->size_in_bytes() , oopSize)
1158 #if INCLUDE_JVMCI
1159 + align_up(speculations_len , oopSize)
1160 #endif
1161 + align_up(debug_info->data_size() , oopSize)
1162 + ImmutableDataReferencesCounterSize;
1163
1164 // First, allocate space for immutable data in C heap.
1165 address immutable_data = nullptr;
1166 if (immutable_data_size > 0) {
1167 immutable_data = (address)os::malloc(immutable_data_size, mtCode);
1168 if (immutable_data == nullptr) {
1169 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data");
1170 return nullptr;
1171 }
1172 }
1173
1174 int mutable_data_size = required_mutable_data_size(code_buffer
1175 JVMCI_ONLY(COMMA (compiler->is_jvmci() ? jvmci_data->size() : 0)));
1176
1177 {
1178 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1179
1180 nm = new (nmethod_size, comp_level)
1181 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, mutable_data_size,
1182 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset,
1183 debug_info, dependencies, code_buffer, frame_size, oop_maps,
1184 handler_table, nul_chk_table, compiler, comp_level
1185 #if INCLUDE_JVMCI
1186 , speculations,
1187 speculations_len,
1188 jvmci_data
1189 #endif
1190 );
1191
1192 if (nm != nullptr) {
1193 // To make dependency checking during class loading fast, record
1194 // the nmethod dependencies in the classes it is dependent on.
1195 // This allows the dependency checking code to simply walk the
1196 // class hierarchy above the loaded class, checking only nmethods
1197 // which are dependent on those classes. The slow way is to
1198 // check every nmethod for dependencies which makes it linear in
1199 // the number of methods compiled. For applications with a lot
1200 // classes the slow way is too slow.
1201 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1202 if (deps.type() == Dependencies::call_site_target_value) {
1203 // CallSite dependencies are managed on per-CallSite instance basis.
1204 oop call_site = deps.argument_oop(0);
1205 MethodHandles::add_dependent_nmethod(call_site, nm);
1206 } else {
1207 InstanceKlass* ik = deps.context_type();
1208 if (ik == nullptr) {
1209 continue; // ignore things like evol_method
1210 }
1211 // record this nmethod as dependent on this klass
1212 ik->add_dependent_nmethod(nm);
1213 }
1214 }
1215 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm));
1216 }
1217 }
1218 // Do verification and logging outside CodeCache_lock.
1219 if (nm != nullptr) {
1220 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet.
1221 DEBUG_ONLY(nm->verify();)
1222 nm->log_new_nmethod();
1223 }
1224 return nm;
1225 }
1226
1227 // Fill in default values for various fields
1228 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) {
1229 // avoid uninitialized fields, even for short time periods
1230 _exception_cache = nullptr;
1231 _gc_data = nullptr;
1232 _oops_do_mark_link = nullptr;
1233 _compiled_ic_data = nullptr;
1234
1235 _is_unloading_state = 0;
1236 _state = not_installed;
1237
1238 _has_unsafe_access = 0;
1239 _has_wide_vectors = 0;
1240 _has_monitors = 0;
1241 _has_scoped_access = 0;
1242 _has_flushed_dependencies = 0;
1243 _is_unlinked = 0;
1244 _load_reported = 0; // jvmti state
1245
1246 _deoptimization_status = not_marked;
1247
1248 // SECT_CONSTS is first in code buffer so the offset should be 0.
1249 int consts_offset = code_buffer->total_offset_of(code_buffer->consts());
1250 assert(consts_offset == 0, "const_offset: %d", consts_offset);
1251
1252 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs());
1253
1254 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry)));
1255 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry)));
1256
1257 _inline_entry_point = entry_point();
1258 _verified_inline_entry_point = verified_entry_point();
1259 _verified_inline_ro_entry_point = verified_entry_point();
1260
1261 _skipped_instructions_size = code_buffer->total_skipped_instructions_size();
1262 }
1263
1264 // Post initialization
1265 void nmethod::post_init() {
1266 clear_unloading_state();
1267
1268 finalize_relocations();
1269
1270 Universe::heap()->register_nmethod(this);
1271 DEBUG_ONLY(Universe::heap()->verify_nmethod(this));
1272
1273 CodeCache::commit(this);
1274 }
1275
1276 // For native wrappers
1277 nmethod::nmethod(
1278 Method* method,
1279 CompilerType type,
1280 int nmethod_size,
1281 int compile_id,
1282 CodeOffsets* offsets,
1283 CodeBuffer* code_buffer,
1284 int frame_size,
1285 ByteSize basic_lock_owner_sp_offset,
1286 ByteSize basic_lock_sp_offset,
1287 OopMapSet* oop_maps,
1288 int mutable_data_size)
1289 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1290 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1291 _deoptimization_generation(0),
1292 _gc_epoch(CodeCache::gc_epoch()),
1293 _method(method),
1294 _native_receiver_sp_offset(basic_lock_owner_sp_offset),
1295 _native_basic_lock_sp_offset(basic_lock_sp_offset)
1296 {
1297 {
1298 DEBUG_ONLY(NoSafepointVerifier nsv;)
1299 assert_locked_or_safepoint(CodeCache_lock);
1300 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet");
1301 init_defaults(code_buffer, offsets);
1302
1303 _osr_entry_point = nullptr;
1304 _pc_desc_container = nullptr;
1305 _entry_bci = InvocationEntryBci;
1306 _compile_id = compile_id;
1307 _comp_level = CompLevel_none;
1308 _compiler_type = type;
1309 _orig_pc_offset = 0;
1310 _num_stack_arg_slots = 0;
1311
1312 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1313 // Continuation enter intrinsic
1314 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1315 } else {
1316 _exception_offset = 0;
1317 }
1318 // Native wrappers do not have deopt handlers. Make the values
1319 // something that will never match a pc like the nmethod vtable entry
1320 _deopt_handler_offset = 0;
1321 _unwind_handler_offset = 0;
1322
1323 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1324 uint16_t metadata_size;
1325 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1326 JVMCI_ONLY( _metadata_size = metadata_size; )
1327 assert(_mutable_data_size == _relocation_size + metadata_size,
1328 "wrong mutable data size: %d != %d + %d",
1329 _mutable_data_size, _relocation_size, metadata_size);
1330
1331 // native wrapper does not have read-only data but we need unique not null address
1332 _immutable_data = blob_end();
1333 _immutable_data_size = 0;
1334 _nul_chk_table_offset = 0;
1335 _handler_table_offset = 0;
1336 _scopes_pcs_offset = 0;
1337 _scopes_data_offset = 0;
1338 #if INCLUDE_JVMCI
1339 _speculations_offset = 0;
1340 #endif
1341 _immutable_data_reference_counter_offset = 0;
1342
1343 code_buffer->copy_code_and_locs_to(this);
1344 code_buffer->copy_values_to(this);
1345
1346 post_init();
1347 }
1348
1349 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) {
1350 ttyLocker ttyl; // keep the following output all in one block
1351 // This output goes directly to the tty, not the compiler log.
1352 // To enable tools to match it up with the compilation activity,
1353 // be sure to tag this tty output with the compile ID.
1354 if (xtty != nullptr) {
1355 xtty->begin_head("print_native_nmethod");
1356 xtty->method(_method);
1357 xtty->stamp();
1358 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this);
1359 }
1360 // Print the header part, then print the requested information.
1361 // This is both handled in decode2(), called via print_code() -> decode()
1362 if (PrintNativeNMethods) {
1363 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------");
1364 print_code();
1365 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1366 #if defined(SUPPORT_DATA_STRUCTS)
1367 if (AbstractDisassembler::show_structs()) {
1368 if (oop_maps != nullptr) {
1369 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning
1370 oop_maps->print_on(tty);
1371 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1372 }
1373 }
1374 #endif
1375 } else {
1376 print(); // print the header part only.
1377 }
1378 #if defined(SUPPORT_DATA_STRUCTS)
1379 if (AbstractDisassembler::show_structs()) {
1380 if (PrintRelocations) {
1381 print_relocations();
1382 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1383 }
1384 }
1385 #endif
1386 if (xtty != nullptr) {
1387 xtty->tail("print_native_nmethod");
1388 }
1389 }
1390 }
1391
1392
1393 nmethod::nmethod(const nmethod &nm) : CodeBlob(nm._name, nm._kind, nm._size, nm._header_size)
1394 {
1395
1396 if (nm._oop_maps != nullptr) {
1397 _oop_maps = nm._oop_maps->clone();
1398 } else {
1399 _oop_maps = nullptr;
1400 }
1401
1402 _size = nm._size;
1403 _relocation_size = nm._relocation_size;
1404 _content_offset = nm._content_offset;
1405 _code_offset = nm._code_offset;
1406 _data_offset = nm._data_offset;
1407 _frame_size = nm._frame_size;
1408
1409 S390_ONLY( _ctable_offset = nm._ctable_offset; )
1410
1411 _header_size = nm._header_size;
1412 _frame_complete_offset = nm._frame_complete_offset;
1413
1414 _kind = nm._kind;
1415
1416 _caller_must_gc_arguments = nm._caller_must_gc_arguments;
1417
1418 #ifndef PRODUCT
1419 _asm_remarks.share(nm._asm_remarks);
1420 _dbg_strings.share(nm._dbg_strings);
1421 #endif
1422
1423 // Allocate memory and copy mutable data to C heap
1424 _mutable_data_size = nm._mutable_data_size;
1425 if (_mutable_data_size > 0) {
1426 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
1427 if (_mutable_data == nullptr) {
1428 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for mutable data");
1429 }
1430 memcpy(mutable_data_begin(), nm.mutable_data_begin(), nm.mutable_data_size());
1431 } else {
1432 _mutable_data = nullptr;
1433 }
1434
1435 _deoptimization_generation = 0;
1436 _gc_epoch = CodeCache::gc_epoch();
1437 _method = nm._method;
1438 _osr_link = nullptr;
1439
1440 _exception_cache = nullptr;
1441 _gc_data = nullptr;
1442 _oops_do_mark_nmethods = nullptr;
1443 _oops_do_mark_link = nullptr;
1444 _compiled_ic_data = nullptr;
1445
1446 if (nm._osr_entry_point != nullptr) {
1447 _osr_entry_point = (nm._osr_entry_point - (address) &nm) + (address) this;
1448 } else {
1449 _osr_entry_point = nullptr;
1450 }
1451
1452 _entry_offset = nm._entry_offset;
1453 _verified_entry_offset = nm._verified_entry_offset;
1454 _entry_bci = nm._entry_bci;
1455 _immutable_data_size = nm._immutable_data_size;
1456
1457 _skipped_instructions_size = nm._skipped_instructions_size;
1458 _stub_offset = nm._stub_offset;
1459 _exception_offset = nm._exception_offset;
1460 _deopt_handler_offset = nm._deopt_handler_offset;
1461 _unwind_handler_offset = nm._unwind_handler_offset;
1462 _num_stack_arg_slots = nm._num_stack_arg_slots;
1463 _oops_size = nm._oops_size;
1464 #if INCLUDE_JVMCI
1465 _metadata_size = nm._metadata_size;
1466 #endif
1467 _nul_chk_table_offset = nm._nul_chk_table_offset;
1468 _handler_table_offset = nm._handler_table_offset;
1469 _scopes_pcs_offset = nm._scopes_pcs_offset;
1470 _scopes_data_offset = nm._scopes_data_offset;
1471 #if INCLUDE_JVMCI
1472 _speculations_offset = nm._speculations_offset;
1473 #endif
1474 _immutable_data_reference_counter_offset = nm._immutable_data_reference_counter_offset;
1475
1476 // Increment number of references to immutable data to share it between nmethods
1477 if (_immutable_data_size > 0) {
1478 _immutable_data = nm._immutable_data;
1479 set_immutable_data_references_counter(get_immutable_data_references_counter() + 1);
1480 } else {
1481 _immutable_data = blob_end();
1482 }
1483
1484 _orig_pc_offset = nm._orig_pc_offset;
1485 _compile_id = nm._compile_id;
1486 _comp_level = nm._comp_level;
1487 _compiler_type = nm._compiler_type;
1488 _is_unloading_state = nm._is_unloading_state;
1489 _state = not_installed;
1490
1491 _has_unsafe_access = nm._has_unsafe_access;
1492 _has_wide_vectors = nm._has_wide_vectors;
1493 _has_monitors = nm._has_monitors;
1494 _has_scoped_access = nm._has_scoped_access;
1495 _has_flushed_dependencies = nm._has_flushed_dependencies;
1496 _is_unlinked = nm._is_unlinked;
1497 _load_reported = nm._load_reported;
1498
1499 _deoptimization_status = nm._deoptimization_status;
1500
1501 if (nm._pc_desc_container != nullptr) {
1502 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1503 } else {
1504 _pc_desc_container = nullptr;
1505 }
1506
1507 // Copy nmethod contents excluding header
1508 // - Constant part (doubles, longs and floats used in nmethod)
1509 // - Code part:
1510 // - Code body
1511 // - Exception handler
1512 // - Stub code
1513 // - OOP table
1514 memcpy(consts_begin(), nm.consts_begin(), nm.data_end() - nm.consts_begin());
1515
1516 post_init();
1517 }
1518
1519 nmethod* nmethod::relocate(CodeBlobType code_blob_type) {
1520 assert(NMethodRelocation, "must enable use of function");
1521
1522 // Locks required to be held by caller to ensure the nmethod
1523 // is not modified or purged from code cache during relocation
1524 assert_lock_strong(CodeCache_lock);
1525 assert_lock_strong(Compile_lock);
1526 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
1527
1528 if (!is_relocatable()) {
1529 return nullptr;
1530 }
1531
1532 run_nmethod_entry_barrier();
1533 nmethod* nm_copy = new (size(), code_blob_type) nmethod(*this);
1534
1535 if (nm_copy == nullptr) {
1536 return nullptr;
1537 }
1538
1539 // Fix relocation
1540 RelocIterator iter(nm_copy);
1541 CodeBuffer src(this);
1542 CodeBuffer dst(nm_copy);
1543 while (iter.next()) {
1544 #ifdef USE_TRAMPOLINE_STUB_FIX_OWNER
1545 // Direct calls may no longer be in range and the use of a trampoline may now be required.
1546 // Instead, allow trampoline relocations to update their owners and perform the necessary checks.
1547 if (iter.reloc()->is_call()) {
1548 address trampoline = trampoline_stub_Relocation::get_trampoline_for(iter.reloc()->addr(), nm_copy);
1549 if (trampoline != nullptr) {
1550 continue;
1551 }
1552 }
1553 #endif
1554
1555 iter.reloc()->fix_relocation_after_move(&src, &dst);
1556 }
1557
1558 // To make dependency checking during class loading fast, record
1559 // the nmethod dependencies in the classes it is dependent on.
1560 // This allows the dependency checking code to simply walk the
1561 // class hierarchy above the loaded class, checking only nmethods
1562 // which are dependent on those classes. The slow way is to
1563 // check every nmethod for dependencies which makes it linear in
1564 // the number of methods compiled. For applications with a lot
1565 // classes the slow way is too slow.
1566 for (Dependencies::DepStream deps(nm_copy); deps.next(); ) {
1567 if (deps.type() == Dependencies::call_site_target_value) {
1568 // CallSite dependencies are managed on per-CallSite instance basis.
1569 oop call_site = deps.argument_oop(0);
1570 MethodHandles::add_dependent_nmethod(call_site, nm_copy);
1571 } else {
1572 InstanceKlass* ik = deps.context_type();
1573 if (ik == nullptr) {
1574 continue; // ignore things like evol_method
1575 }
1576 // record this nmethod as dependent on this klass
1577 ik->add_dependent_nmethod(nm_copy);
1578 }
1579 }
1580
1581 MutexLocker ml_NMethodState_lock(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1582
1583 // Verify the nm we copied from is still valid
1584 if (!is_marked_for_deoptimization() && is_in_use()) {
1585 assert(method() != nullptr && method()->code() == this, "should be if is in use");
1586
1587 nm_copy->clear_inline_caches();
1588
1589 // Attempt to start using the copy
1590 if (nm_copy->make_in_use()) {
1591 ICache::invalidate_range(nm_copy->code_begin(), nm_copy->code_size());
1592
1593 methodHandle mh(Thread::current(), nm_copy->method());
1594 nm_copy->method()->set_code(mh, nm_copy);
1595
1596 make_not_used();
1597
1598 nm_copy->post_compiled_method_load_event();
1599
1600 nm_copy->log_relocated_nmethod(this);
1601
1602 return nm_copy;
1603 }
1604 }
1605
1606 nm_copy->make_not_used();
1607
1608 return nullptr;
1609 }
1610
1611 bool nmethod::is_relocatable() {
1612 if (!is_java_method()) {
1613 return false;
1614 }
1615
1616 if (!is_in_use()) {
1617 return false;
1618 }
1619
1620 if (is_osr_method()) {
1621 return false;
1622 }
1623
1624 if (is_marked_for_deoptimization()) {
1625 return false;
1626 }
1627
1628 #if INCLUDE_JVMCI
1629 if (jvmci_nmethod_data() != nullptr && jvmci_nmethod_data()->has_mirror()) {
1630 return false;
1631 }
1632 #endif
1633
1634 if (is_unloading()) {
1635 return false;
1636 }
1637
1638 if (has_evol_metadata()) {
1639 return false;
1640 }
1641
1642 return true;
1643 }
1644
1645 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () {
1646 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level));
1647 }
1648
1649 void* nmethod::operator new(size_t size, int nmethod_size, CodeBlobType code_blob_type) throw () {
1650 return CodeCache::allocate(nmethod_size, code_blob_type);
1651 }
1652
1653 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () {
1654 // Try MethodNonProfiled and MethodProfiled.
1655 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled);
1656 if (return_value != nullptr || !allow_NonNMethod_space) return return_value;
1657 // Try NonNMethod or give up.
1658 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod);
1659 }
1660
1661 // For normal JIT compiled code
1662 nmethod::nmethod(
1663 Method* method,
1664 CompilerType type,
1665 int nmethod_size,
1666 int immutable_data_size,
1667 int mutable_data_size,
1668 int compile_id,
1669 int entry_bci,
1670 address immutable_data,
1671 CodeOffsets* offsets,
1672 int orig_pc_offset,
1673 DebugInformationRecorder* debug_info,
1674 Dependencies* dependencies,
1675 CodeBuffer *code_buffer,
1676 int frame_size,
1677 OopMapSet* oop_maps,
1678 ExceptionHandlerTable* handler_table,
1679 ImplicitExceptionTable* nul_chk_table,
1680 AbstractCompiler* compiler,
1681 CompLevel comp_level
1682 #if INCLUDE_JVMCI
1683 , char* speculations,
1684 int speculations_len,
1685 JVMCINMethodData* jvmci_data
1686 #endif
1687 )
1688 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod),
1689 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, mutable_data_size),
1690 _deoptimization_generation(0),
1691 _gc_epoch(CodeCache::gc_epoch()),
1692 _method(method),
1693 _osr_link(nullptr)
1694 {
1695 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR");
1696 {
1697 DEBUG_ONLY(NoSafepointVerifier nsv;)
1698 assert_locked_or_safepoint(CodeCache_lock);
1699
1700 init_defaults(code_buffer, offsets);
1701
1702 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry);
1703 _entry_bci = entry_bci;
1704 _compile_id = compile_id;
1705 _comp_level = comp_level;
1706 _compiler_type = type;
1707 _orig_pc_offset = orig_pc_offset;
1708
1709 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots();
1710
1711 set_ctable_begin(header_begin() + content_offset());
1712
1713 #if INCLUDE_JVMCI
1714 if (compiler->is_jvmci()) {
1715 // JVMCI might not produce any stub sections
1716 if (offsets->value(CodeOffsets::Exceptions) != -1) {
1717 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions);
1718 } else {
1719 _exception_offset = -1;
1720 }
1721 if (offsets->value(CodeOffsets::Deopt) != -1) {
1722 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt);
1723 } else {
1724 _deopt_handler_offset = -1;
1725 }
1726 } else
1727 #endif
1728 {
1729 // Exception handler and deopt handler are in the stub section
1730 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set");
1731 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set");
1732
1733 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions);
1734 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt);
1735 }
1736 if (offsets->value(CodeOffsets::UnwindHandler) != -1) {
1737 // C1 generates UnwindHandler at the end of instructions section.
1738 // Calculate positive offset as distance between the start of stubs section
1739 // (which is also the end of instructions section) and the start of the handler.
1740 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler);
1741 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset));
1742 } else {
1743 _unwind_handler_offset = -1;
1744 }
1745
1746 CHECKED_CAST(_oops_size, uint16_t, align_up(code_buffer->total_oop_size(), oopSize));
1747 uint16_t metadata_size;
1748 CHECKED_CAST(metadata_size, uint16_t, align_up(code_buffer->total_metadata_size(), wordSize));
1749 JVMCI_ONLY( _metadata_size = metadata_size; )
1750 int jvmci_data_size = 0 JVMCI_ONLY( + align_up(compiler->is_jvmci() ? jvmci_data->size() : 0, oopSize));
1751 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry);
1752 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry);
1753 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO);
1754
1755 assert(_mutable_data_size == _relocation_size + metadata_size + jvmci_data_size,
1756 "wrong mutable data size: %d != %d + %d + %d",
1757 _mutable_data_size, _relocation_size, metadata_size, jvmci_data_size);
1758 assert(nmethod_size == data_end() - header_begin(), "wrong nmethod size: %d != %d",
1759 nmethod_size, (int)(code_end() - header_begin()));
1760
1761 _immutable_data_size = immutable_data_size;
1762 if (immutable_data_size > 0) {
1763 assert(immutable_data != nullptr, "required");
1764 _immutable_data = immutable_data;
1765 } else {
1766 // We need unique not null address
1767 _immutable_data = blob_end();
1768 }
1769 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize)));
1770 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize)));
1771 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize);
1772 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size());
1773
1774 #if INCLUDE_JVMCI
1775 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1776 _immutable_data_reference_counter_offset = _speculations_offset + align_up(speculations_len, oopSize);
1777 DEBUG_ONLY( int immutable_data_end_offset = _immutable_data_reference_counter_offset + ImmutableDataReferencesCounterSize; )
1778 #else
1779 _immutable_data_reference_counter_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize);
1780 DEBUG_ONLY( int immutable_data_end_offset = _immutable_data_reference_counter_offset + ImmutableDataReferencesCounterSize; )
1781 #endif
1782 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d",
1783 immutable_data_end_offset, immutable_data_size);
1784
1785 // Copy code and relocation info
1786 code_buffer->copy_code_and_locs_to(this);
1787 // Copy oops and metadata
1788 code_buffer->copy_values_to(this);
1789 dependencies->copy_to(this);
1790 // Copy PcDesc and ScopeDesc data
1791 debug_info->copy_to(this);
1792
1793 // Create cache after PcDesc data is copied - it will be used to initialize cache
1794 _pc_desc_container = new PcDescContainer(scopes_pcs_begin());
1795
1796 #if INCLUDE_JVMCI
1797 if (compiler->is_jvmci()) {
1798 // Initialize the JVMCINMethodData object inlined into nm
1799 jvmci_nmethod_data()->copy(jvmci_data);
1800 }
1801 #endif
1802
1803 // Copy contents of ExceptionHandlerTable to nmethod
1804 handler_table->copy_to(this);
1805 nul_chk_table->copy_to(this);
1806
1807 #if INCLUDE_JVMCI
1808 // Copy speculations to nmethod
1809 if (speculations_size() != 0) {
1810 memcpy(speculations_begin(), speculations, speculations_len);
1811 }
1812 #endif
1813 set_immutable_data_references_counter(1);
1814
1815 post_init();
1816
1817 // we use the information of entry points to find out if a method is
1818 // static or non static
1819 assert(compiler->is_c2() || compiler->is_jvmci() ||
1820 _method->is_static() == (entry_point() == verified_entry_point()),
1821 " entry points must be same for static methods and vice versa");
1822 }
1823 }
1824
1825 // Print a short set of xml attributes to identify this nmethod. The
1826 // output should be embedded in some other element.
1827 void nmethod::log_identity(xmlStream* log) const {
1828 log->print(" compile_id='%d'", compile_id());
1829 const char* nm_kind = compile_kind();
1830 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind);
1831 log->print(" compiler='%s'", compiler_name());
1832 if (TieredCompilation) {
1833 log->print(" level='%d'", comp_level());
1834 }
1835 #if INCLUDE_JVMCI
1836 if (jvmci_nmethod_data() != nullptr) {
1837 const char* jvmci_name = jvmci_nmethod_data()->name();
1838 if (jvmci_name != nullptr) {
1839 log->print(" jvmci_mirror_name='");
1840 log->text("%s", jvmci_name);
1841 log->print("'");
1842 }
1843 }
1844 #endif
1845 }
1846
1847
1848 #define LOG_OFFSET(log, name) \
1849 if (p2i(name##_end()) - p2i(name##_begin())) \
1850 log->print(" " XSTR(name) "_offset='%zd'" , \
1851 p2i(name##_begin()) - p2i(this))
1852
1853
1854 void nmethod::log_new_nmethod() const {
1855 if (LogCompilation && xtty != nullptr) {
1856 ttyLocker ttyl;
1857 xtty->begin_elem("nmethod");
1858 log_identity(xtty);
1859 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1860 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this));
1861
1862 LOG_OFFSET(xtty, relocation);
1863 LOG_OFFSET(xtty, consts);
1864 LOG_OFFSET(xtty, insts);
1865 LOG_OFFSET(xtty, stub);
1866 LOG_OFFSET(xtty, scopes_data);
1867 LOG_OFFSET(xtty, scopes_pcs);
1868 LOG_OFFSET(xtty, dependencies);
1869 LOG_OFFSET(xtty, handler_table);
1870 LOG_OFFSET(xtty, nul_chk_table);
1871 LOG_OFFSET(xtty, oops);
1872 LOG_OFFSET(xtty, metadata);
1873
1874 xtty->method(method());
1875 xtty->stamp();
1876 xtty->end_elem();
1877 }
1878 }
1879
1880
1881 void nmethod::log_relocated_nmethod(nmethod* original) const {
1882 if (LogCompilation && xtty != nullptr) {
1883 ttyLocker ttyl;
1884 xtty->begin_elem("relocated nmethod");
1885 log_identity(xtty);
1886 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size());
1887
1888 const char* original_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(original));
1889 xtty->print(" original_address='" INTPTR_FORMAT "'", p2i(original));
1890 xtty->print(" original_code_heap='%s'", original_code_heap_name);
1891
1892 const char* new_code_heap_name = CodeCache::get_code_heap_name(CodeCache::get_code_blob_type(this));
1893 xtty->print(" new_address='" INTPTR_FORMAT "'", p2i(this));
1894 xtty->print(" new_code_heap='%s'", new_code_heap_name);
1895
1896 LOG_OFFSET(xtty, relocation);
1897 LOG_OFFSET(xtty, consts);
1898 LOG_OFFSET(xtty, insts);
1899 LOG_OFFSET(xtty, stub);
1900 LOG_OFFSET(xtty, scopes_data);
1901 LOG_OFFSET(xtty, scopes_pcs);
1902 LOG_OFFSET(xtty, dependencies);
1903 LOG_OFFSET(xtty, handler_table);
1904 LOG_OFFSET(xtty, nul_chk_table);
1905 LOG_OFFSET(xtty, oops);
1906 LOG_OFFSET(xtty, metadata);
1907
1908 xtty->method(method());
1909 xtty->stamp();
1910 xtty->end_elem();
1911 }
1912 }
1913
1914 #undef LOG_OFFSET
1915
1916
1917 // Print out more verbose output usually for a newly created nmethod.
1918 void nmethod::print_on_with_msg(outputStream* st, const char* msg) const {
1919 if (st != nullptr) {
1920 ttyLocker ttyl;
1921 if (WizardMode) {
1922 CompileTask::print(st, this, msg, /*short_form:*/ true);
1923 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this));
1924 } else {
1925 CompileTask::print(st, this, msg, /*short_form:*/ false);
1926 }
1927 }
1928 }
1929
1930 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) {
1931 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption;
1932 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
1933 print_nmethod(printnmethods);
1934 }
1935 }
1936
1937 void nmethod::print_nmethod(bool printmethod) {
1938 ttyLocker ttyl; // keep the following output all in one block
1939 if (xtty != nullptr) {
1940 xtty->begin_head("print_nmethod");
1941 log_identity(xtty);
1942 xtty->stamp();
1943 xtty->end_head();
1944 }
1945 // Print the header part, then print the requested information.
1946 // This is both handled in decode2().
1947 if (printmethod) {
1948 ResourceMark m;
1949 if (is_compiled_by_c1()) {
1950 tty->cr();
1951 tty->print_cr("============================= C1-compiled nmethod ==============================");
1952 }
1953 if (is_compiled_by_jvmci()) {
1954 tty->cr();
1955 tty->print_cr("=========================== JVMCI-compiled nmethod =============================");
1956 }
1957 tty->print_cr("----------------------------------- Assembly -----------------------------------");
1958 decode2(tty);
1959 #if defined(SUPPORT_DATA_STRUCTS)
1960 if (AbstractDisassembler::show_structs()) {
1961 // Print the oops from the underlying CodeBlob as well.
1962 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1963 print_oops(tty);
1964 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1965 print_metadata(tty);
1966 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1967 print_pcs_on(tty);
1968 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1969 if (oop_maps() != nullptr) {
1970 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning
1971 oop_maps()->print_on(tty);
1972 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1973 }
1974 }
1975 #endif
1976 } else {
1977 print(); // print the header part only.
1978 }
1979
1980 #if defined(SUPPORT_DATA_STRUCTS)
1981 if (AbstractDisassembler::show_structs()) {
1982 methodHandle mh(Thread::current(), _method);
1983 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) {
1984 print_scopes();
1985 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1986 }
1987 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) {
1988 print_relocations();
1989 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1990 }
1991 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) {
1992 print_dependencies_on(tty);
1993 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1994 }
1995 if (printmethod || PrintExceptionHandlers) {
1996 print_handler_table();
1997 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
1998 print_nul_chk_table();
1999 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2000 }
2001
2002 if (printmethod) {
2003 print_recorded_oops();
2004 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2005 print_recorded_metadata();
2006 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ");
2007 }
2008 }
2009 #endif
2010
2011 if (xtty != nullptr) {
2012 xtty->tail("print_nmethod");
2013 }
2014 }
2015
2016
2017 // Promote one word from an assembly-time handle to a live embedded oop.
2018 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) {
2019 if (handle == nullptr ||
2020 // As a special case, IC oops are initialized to 1 or -1.
2021 handle == (jobject) Universe::non_oop_word()) {
2022 *(void**)dest = handle;
2023 } else {
2024 *dest = JNIHandles::resolve_non_null(handle);
2025 }
2026 }
2027
2028
2029 // Have to have the same name because it's called by a template
2030 void nmethod::copy_values(GrowableArray<jobject>* array) {
2031 int length = array->length();
2032 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough");
2033 oop* dest = oops_begin();
2034 for (int index = 0 ; index < length; index++) {
2035 initialize_immediate_oop(&dest[index], array->at(index));
2036 }
2037
2038 // Now we can fix up all the oops in the code. We need to do this
2039 // in the code because the assembler uses jobjects as placeholders.
2040 // The code and relocations have already been initialized by the
2041 // CodeBlob constructor, so it is valid even at this early point to
2042 // iterate over relocations and patch the code.
2043 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true);
2044 }
2045
2046 void nmethod::copy_values(GrowableArray<Metadata*>* array) {
2047 int length = array->length();
2048 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough");
2049 Metadata** dest = metadata_begin();
2050 for (int index = 0 ; index < length; index++) {
2051 dest[index] = array->at(index);
2052 }
2053 }
2054
2055 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) {
2056 // re-patch all oop-bearing instructions, just in case some oops moved
2057 RelocIterator iter(this, begin, end);
2058 while (iter.next()) {
2059 if (iter.type() == relocInfo::oop_type) {
2060 oop_Relocation* reloc = iter.oop_reloc();
2061 if (initialize_immediates && reloc->oop_is_immediate()) {
2062 oop* dest = reloc->oop_addr();
2063 jobject obj = *reinterpret_cast<jobject*>(dest);
2064 initialize_immediate_oop(dest, obj);
2065 }
2066 // Refresh the oop-related bits of this instruction.
2067 reloc->fix_oop_relocation();
2068 } else if (iter.type() == relocInfo::metadata_type) {
2069 metadata_Relocation* reloc = iter.metadata_reloc();
2070 reloc->fix_metadata_relocation();
2071 }
2072 }
2073 }
2074
2075 static void install_post_call_nop_displacement(nmethod* nm, address pc) {
2076 NativePostCallNop* nop = nativePostCallNop_at((address) pc);
2077 intptr_t cbaddr = (intptr_t) nm;
2078 intptr_t offset = ((intptr_t) pc) - cbaddr;
2079
2080 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin()));
2081 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks
2082 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset);
2083 } else if (!nop->patch(oopmap_slot, offset)) {
2084 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset);
2085 }
2086 }
2087
2088 void nmethod::finalize_relocations() {
2089 NoSafepointVerifier nsv;
2090
2091 GrowableArray<NativeMovConstReg*> virtual_call_data;
2092
2093 // Make sure that post call nops fill in nmethod offsets eagerly so
2094 // we don't have to race with deoptimization
2095 RelocIterator iter(this);
2096 while (iter.next()) {
2097 if (iter.type() == relocInfo::virtual_call_type) {
2098 virtual_call_Relocation* r = iter.virtual_call_reloc();
2099 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value());
2100 virtual_call_data.append(value);
2101 } else if (iter.type() == relocInfo::post_call_nop_type) {
2102 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc();
2103 address pc = reloc->addr();
2104 install_post_call_nop_displacement(this, pc);
2105 }
2106 }
2107
2108 if (virtual_call_data.length() > 0) {
2109 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster.
2110 _compiled_ic_data = new CompiledICData[virtual_call_data.length()];
2111 CompiledICData* next_data = _compiled_ic_data;
2112
2113 for (NativeMovConstReg* value : virtual_call_data) {
2114 value->set_data((intptr_t)next_data);
2115 next_data++;
2116 }
2117 }
2118 }
2119
2120 void nmethod::make_deoptimized() {
2121 if (!Continuations::enabled()) {
2122 // Don't deopt this again.
2123 set_deoptimized_done();
2124 return;
2125 }
2126
2127 assert(method() == nullptr || can_be_deoptimized(), "");
2128
2129 CompiledICLocker ml(this);
2130 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2131
2132 // If post call nops have been already patched, we can just bail-out.
2133 if (has_been_deoptimized()) {
2134 return;
2135 }
2136
2137 ResourceMark rm;
2138 RelocIterator iter(this, oops_reloc_begin());
2139
2140 while (iter.next()) {
2141
2142 switch (iter.type()) {
2143 case relocInfo::virtual_call_type: {
2144 CompiledIC *ic = CompiledIC_at(&iter);
2145 address pc = ic->end_of_call();
2146 NativePostCallNop* nop = nativePostCallNop_at(pc);
2147 if (nop != nullptr) {
2148 nop->make_deopt();
2149 }
2150 assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2151 break;
2152 }
2153 case relocInfo::static_call_type:
2154 case relocInfo::opt_virtual_call_type: {
2155 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc());
2156 address pc = csc->end_of_call();
2157 NativePostCallNop* nop = nativePostCallNop_at(pc);
2158 //tty->print_cr(" - static pc %p", pc);
2159 if (nop != nullptr) {
2160 nop->make_deopt();
2161 }
2162 // We can't assert here, there are some calls to stubs / runtime
2163 // that have reloc data and doesn't have a post call NOP.
2164 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check");
2165 break;
2166 }
2167 default:
2168 break;
2169 }
2170 }
2171 // Don't deopt this again.
2172 set_deoptimized_done();
2173 }
2174
2175 void nmethod::verify_clean_inline_caches() {
2176 assert(CompiledICLocker::is_safe(this), "mt unsafe call");
2177
2178 ResourceMark rm;
2179 RelocIterator iter(this, oops_reloc_begin());
2180 while(iter.next()) {
2181 switch(iter.type()) {
2182 case relocInfo::virtual_call_type: {
2183 CompiledIC *ic = CompiledIC_at(&iter);
2184 CodeBlob *cb = CodeCache::find_blob(ic->destination());
2185 assert(cb != nullptr, "destination not in CodeBlob?");
2186 nmethod* nm = cb->as_nmethod_or_null();
2187 if (nm != nullptr) {
2188 // Verify that inline caches pointing to bad nmethods are clean
2189 if (!nm->is_in_use() || nm->is_unloading()) {
2190 assert(ic->is_clean(), "IC should be clean");
2191 }
2192 }
2193 break;
2194 }
2195 case relocInfo::static_call_type:
2196 case relocInfo::opt_virtual_call_type: {
2197 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc());
2198 CodeBlob *cb = CodeCache::find_blob(cdc->destination());
2199 assert(cb != nullptr, "destination not in CodeBlob?");
2200 nmethod* nm = cb->as_nmethod_or_null();
2201 if (nm != nullptr) {
2202 // Verify that inline caches pointing to bad nmethods are clean
2203 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) {
2204 assert(cdc->is_clean(), "IC should be clean");
2205 }
2206 }
2207 break;
2208 }
2209 default:
2210 break;
2211 }
2212 }
2213 }
2214
2215 void nmethod::mark_as_maybe_on_stack() {
2216 AtomicAccess::store(&_gc_epoch, CodeCache::gc_epoch());
2217 }
2218
2219 bool nmethod::is_maybe_on_stack() {
2220 // If the condition below is true, it means that the nmethod was found to
2221 // be alive the previous completed marking cycle.
2222 return AtomicAccess::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle();
2223 }
2224
2225 void nmethod::inc_decompile_count() {
2226 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return;
2227 // Could be gated by ProfileTraps, but do not bother...
2228 #if INCLUDE_JVMCI
2229 if (jvmci_skip_profile_deopt()) {
2230 return;
2231 }
2232 #endif
2233 Method* m = method();
2234 if (m == nullptr) return;
2235 MethodData* mdo = m->method_data();
2236 if (mdo == nullptr) return;
2237 // There is a benign race here. See comments in methodData.hpp.
2238 mdo->inc_decompile_count();
2239 }
2240
2241 bool nmethod::try_transition(signed char new_state_int) {
2242 signed char new_state = new_state_int;
2243 assert_lock_strong(NMethodState_lock);
2244 signed char old_state = _state;
2245 if (old_state >= new_state) {
2246 // Ensure monotonicity of transitions.
2247 return false;
2248 }
2249 AtomicAccess::store(&_state, new_state);
2250 return true;
2251 }
2252
2253 void nmethod::invalidate_osr_method() {
2254 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
2255 // Remove from list of active nmethods
2256 if (method() != nullptr) {
2257 method()->method_holder()->remove_osr_nmethod(this);
2258 }
2259 }
2260
2261 void nmethod::log_state_change(InvalidationReason invalidation_reason) const {
2262 if (LogCompilation) {
2263 if (xtty != nullptr) {
2264 ttyLocker ttyl; // keep the following output all in one block
2265 xtty->begin_elem("make_not_entrant thread='%zu' reason='%s'",
2266 os::current_thread_id(), invalidation_reason_to_string(invalidation_reason));
2267 log_identity(xtty);
2268 xtty->stamp();
2269 xtty->end_elem();
2270 }
2271 }
2272
2273 ResourceMark rm;
2274 stringStream ss(NEW_RESOURCE_ARRAY(char, 256), 256);
2275 ss.print("made not entrant: %s", invalidation_reason_to_string(invalidation_reason));
2276
2277 CompileTask::print_ul(this, ss.freeze());
2278 if (PrintCompilation) {
2279 print_on_with_msg(tty, ss.freeze());
2280 }
2281 }
2282
2283 void nmethod::unlink_from_method() {
2284 if (method() != nullptr) {
2285 method()->unlink_code(this);
2286 }
2287 }
2288
2289 // Invalidate code
2290 bool nmethod::make_not_entrant(InvalidationReason invalidation_reason) {
2291 // This can be called while the system is already at a safepoint which is ok
2292 NoSafepointVerifier nsv;
2293
2294 if (is_unloading()) {
2295 // If the nmethod is unloading, then it is already not entrant through
2296 // the nmethod entry barriers. No need to do anything; GC will unload it.
2297 return false;
2298 }
2299
2300 if (AtomicAccess::load(&_state) == not_entrant) {
2301 // Avoid taking the lock if already in required state.
2302 // This is safe from races because the state is an end-state,
2303 // which the nmethod cannot back out of once entered.
2304 // No need for fencing either.
2305 return false;
2306 }
2307
2308 {
2309 // Enter critical section. Does not block for safepoint.
2310 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
2311
2312 if (AtomicAccess::load(&_state) == not_entrant) {
2313 // another thread already performed this transition so nothing
2314 // to do, but return false to indicate this.
2315 return false;
2316 }
2317
2318 if (is_osr_method()) {
2319 // This logic is equivalent to the logic below for patching the
2320 // verified entry point of regular methods.
2321 // this effectively makes the osr nmethod not entrant
2322 invalidate_osr_method();
2323 } else {
2324 // The caller can be calling the method statically or through an inline
2325 // cache call.
2326 BarrierSet::barrier_set()->barrier_set_nmethod()->make_not_entrant(this);
2327 }
2328
2329 if (update_recompile_counts()) {
2330 // Mark the method as decompiled.
2331 inc_decompile_count();
2332 }
2333
2334 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2335 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2336 // If nmethod entry barriers are not supported, we won't mark
2337 // nmethods as on-stack when they become on-stack. So we
2338 // degrade to a less accurate flushing strategy, for now.
2339 mark_as_maybe_on_stack();
2340 }
2341
2342 // Change state
2343 bool success = try_transition(not_entrant);
2344 assert(success, "Transition can't fail");
2345
2346 // Log the transition once
2347 log_state_change(invalidation_reason);
2348
2349 // Remove nmethod from method.
2350 unlink_from_method();
2351
2352 } // leave critical region under NMethodState_lock
2353
2354 #if INCLUDE_JVMCI
2355 // Invalidate can't occur while holding the NMethodState_lock
2356 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2357 if (nmethod_data != nullptr) {
2358 nmethod_data->invalidate_nmethod_mirror(this, invalidation_reason);
2359 }
2360 #endif
2361
2362 #ifdef ASSERT
2363 if (is_osr_method() && method() != nullptr) {
2364 // Make sure osr nmethod is invalidated, i.e. not on the list
2365 bool found = method()->method_holder()->remove_osr_nmethod(this);
2366 assert(!found, "osr nmethod should have been invalidated");
2367 }
2368 #endif
2369
2370 return true;
2371 }
2372
2373 // For concurrent GCs, there must be a handshake between unlink and flush
2374 void nmethod::unlink() {
2375 if (is_unlinked()) {
2376 // Already unlinked.
2377 return;
2378 }
2379
2380 flush_dependencies();
2381
2382 // unlink_from_method will take the NMethodState_lock.
2383 // In this case we don't strictly need it when unlinking nmethods from
2384 // the Method, because it is only concurrently unlinked by
2385 // the entry barrier, which acquires the per nmethod lock.
2386 unlink_from_method();
2387
2388 if (is_osr_method()) {
2389 invalidate_osr_method();
2390 }
2391
2392 #if INCLUDE_JVMCI
2393 // Clear the link between this nmethod and a HotSpotNmethod mirror
2394 JVMCINMethodData* nmethod_data = jvmci_nmethod_data();
2395 if (nmethod_data != nullptr) {
2396 nmethod_data->invalidate_nmethod_mirror(this, is_cold() ?
2397 nmethod::InvalidationReason::UNLOADING_COLD :
2398 nmethod::InvalidationReason::UNLOADING);
2399 }
2400 #endif
2401
2402 // Post before flushing as jmethodID is being used
2403 post_compiled_method_unload();
2404
2405 // Register for flushing when it is safe. For concurrent class unloading,
2406 // that would be after the unloading handshake, and for STW class unloading
2407 // that would be when getting back to the VM thread.
2408 ClassUnloadingContext::context()->register_unlinked_nmethod(this);
2409 }
2410
2411 void nmethod::purge(bool unregister_nmethod) {
2412
2413 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2414
2415 // completely deallocate this method
2416 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this));
2417
2418 LogTarget(Debug, codecache) lt;
2419 if (lt.is_enabled()) {
2420 ResourceMark rm;
2421 LogStream ls(lt);
2422 const char* method_name = method()->name()->as_C_string();
2423 const size_t codecache_capacity = CodeCache::capacity()/1024;
2424 const size_t codecache_free_space = CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024;
2425 ls.print("Flushing nmethod %6d/" INTPTR_FORMAT ", level=%d, osr=%d, cold=%d, epoch=" UINT64_FORMAT ", cold_count=" UINT64_FORMAT ". "
2426 "Cache capacity: %zuKb, free space: %zuKb. method %s (%s)",
2427 _compile_id, p2i(this), _comp_level, is_osr_method(), is_cold(), _gc_epoch, CodeCache::cold_gc_count(),
2428 codecache_capacity, codecache_free_space, method_name, compiler_name());
2429 }
2430
2431 // We need to deallocate any ExceptionCache data.
2432 // Note that we do not need to grab the nmethod lock for this, it
2433 // better be thread safe if we're disposing of it!
2434 ExceptionCache* ec = exception_cache();
2435 while(ec != nullptr) {
2436 ExceptionCache* next = ec->next();
2437 delete ec;
2438 ec = next;
2439 }
2440 if (_pc_desc_container != nullptr) {
2441 delete _pc_desc_container;
2442 }
2443 delete[] _compiled_ic_data;
2444
2445 if (_immutable_data != blob_end()) {
2446 int reference_count = get_immutable_data_references_counter();
2447 assert(reference_count > 0, "immutable data has no references");
2448
2449 set_immutable_data_references_counter(reference_count - 1);
2450 // Free memory if this is the last nmethod referencing immutable data
2451 if (reference_count == 0) {
2452 os::free(_immutable_data);
2453 }
2454
2455 _immutable_data = blob_end(); // Valid not null address
2456 }
2457
2458 if (unregister_nmethod) {
2459 Universe::heap()->unregister_nmethod(this);
2460 }
2461 CodeCache::unregister_old_nmethod(this);
2462
2463 JVMCI_ONLY( _metadata_size = 0; )
2464 CodeBlob::purge();
2465 }
2466
2467 oop nmethod::oop_at(int index) const {
2468 if (index == 0) {
2469 return nullptr;
2470 }
2471
2472 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2473 return bs_nm->oop_load_no_keepalive(this, index);
2474 }
2475
2476 oop nmethod::oop_at_phantom(int index) const {
2477 if (index == 0) {
2478 return nullptr;
2479 }
2480
2481 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2482 return bs_nm->oop_load_phantom(this, index);
2483 }
2484
2485 //
2486 // Notify all classes this nmethod is dependent on that it is no
2487 // longer dependent.
2488
2489 void nmethod::flush_dependencies() {
2490 if (!has_flushed_dependencies()) {
2491 set_has_flushed_dependencies(true);
2492 for (Dependencies::DepStream deps(this); deps.next(); ) {
2493 if (deps.type() == Dependencies::call_site_target_value) {
2494 // CallSite dependencies are managed on per-CallSite instance basis.
2495 oop call_site = deps.argument_oop(0);
2496 MethodHandles::clean_dependency_context(call_site);
2497 } else {
2498 InstanceKlass* ik = deps.context_type();
2499 if (ik == nullptr) {
2500 continue; // ignore things like evol_method
2501 }
2502 // During GC liveness of dependee determines class that needs to be updated.
2503 // The GC may clean dependency contexts concurrently and in parallel.
2504 ik->clean_dependency_context();
2505 }
2506 }
2507 }
2508 }
2509
2510 void nmethod::post_compiled_method(CompileTask* task) {
2511 task->mark_success();
2512 task->set_nm_content_size(content_size());
2513 task->set_nm_insts_size(insts_size());
2514 task->set_nm_total_size(total_size());
2515
2516 // JVMTI -- compiled method notification (must be done outside lock)
2517 post_compiled_method_load_event();
2518
2519 if (CompilationLog::log() != nullptr) {
2520 CompilationLog::log()->log_nmethod(JavaThread::current(), this);
2521 }
2522
2523 const DirectiveSet* directive = task->directive();
2524 maybe_print_nmethod(directive);
2525 }
2526
2527 #if INCLUDE_CDS
2528 static GrowableArrayCHeap<nmethod*, mtClassShared>* _delayed_compiled_method_load_events = nullptr;
2529
2530 void nmethod::add_delayed_compiled_method_load_event(nmethod* nm) {
2531 precond(CDSConfig::is_using_aot_linked_classes());
2532 precond(!ServiceThread::has_started());
2533
2534 // We are still in single threaded stage of VM bootstrap. No need to lock.
2535 if (_delayed_compiled_method_load_events == nullptr) {
2536 _delayed_compiled_method_load_events = new GrowableArrayCHeap<nmethod*, mtClassShared>();
2537 }
2538 _delayed_compiled_method_load_events->append(nm);
2539 }
2540
2541 void nmethod::post_delayed_compiled_method_load_events() {
2542 precond(ServiceThread::has_started());
2543 if (_delayed_compiled_method_load_events != nullptr) {
2544 for (int i = 0; i < _delayed_compiled_method_load_events->length(); i++) {
2545 nmethod* nm = _delayed_compiled_method_load_events->at(i);
2546 nm->post_compiled_method_load_event();
2547 }
2548 delete _delayed_compiled_method_load_events;
2549 _delayed_compiled_method_load_events = nullptr;
2550 }
2551 }
2552 #endif
2553
2554 // ------------------------------------------------------------------
2555 // post_compiled_method_load_event
2556 // new method for install_code() path
2557 // Transfer information from compilation to jvmti
2558 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) {
2559 #if INCLUDE_CDS
2560 if (!ServiceThread::has_started()) {
2561 // With AOT-linked classes, we could compile wrappers for native methods before the
2562 // ServiceThread has been started, so we must delay the events to be posted later.
2563 assert(state == nullptr, "must be");
2564 add_delayed_compiled_method_load_event(this);
2565 return;
2566 }
2567 #endif
2568
2569 // This is a bad time for a safepoint. We don't want
2570 // this nmethod to get unloaded while we're queueing the event.
2571 NoSafepointVerifier nsv;
2572
2573 Method* m = method();
2574 HOTSPOT_COMPILED_METHOD_LOAD(
2575 (char *) m->klass_name()->bytes(),
2576 m->klass_name()->utf8_length(),
2577 (char *) m->name()->bytes(),
2578 m->name()->utf8_length(),
2579 (char *) m->signature()->bytes(),
2580 m->signature()->utf8_length(),
2581 insts_begin(), insts_size());
2582
2583
2584 if (JvmtiExport::should_post_compiled_method_load()) {
2585 // Only post unload events if load events are found.
2586 set_load_reported();
2587 // If a JavaThread hasn't been passed in, let the Service thread
2588 // (which is a real Java thread) post the event
2589 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this);
2590 if (state == nullptr) {
2591 // Execute any barrier code for this nmethod as if it's called, since
2592 // keeping it alive looks like stack walking.
2593 run_nmethod_entry_barrier();
2594 ServiceThread::enqueue_deferred_event(&event);
2595 } else {
2596 // This enters the nmethod barrier outside in the caller.
2597 state->enqueue_event(&event);
2598 }
2599 }
2600 }
2601
2602 void nmethod::post_compiled_method_unload() {
2603 assert(_method != nullptr, "just checking");
2604 DTRACE_METHOD_UNLOAD_PROBE(method());
2605
2606 // If a JVMTI agent has enabled the CompiledMethodUnload event then
2607 // post the event. The Method* will not be valid when this is freed.
2608
2609 // Don't bother posting the unload if the load event wasn't posted.
2610 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) {
2611 JvmtiDeferredEvent event =
2612 JvmtiDeferredEvent::compiled_method_unload_event(
2613 method()->jmethod_id(), insts_begin());
2614 ServiceThread::enqueue_deferred_event(&event);
2615 }
2616 }
2617
2618 // Iterate over metadata calling this function. Used by RedefineClasses
2619 void nmethod::metadata_do(MetadataClosure* f) {
2620 {
2621 // Visit all immediate references that are embedded in the instruction stream.
2622 RelocIterator iter(this, oops_reloc_begin());
2623 while (iter.next()) {
2624 if (iter.type() == relocInfo::metadata_type) {
2625 metadata_Relocation* r = iter.metadata_reloc();
2626 // In this metadata, we must only follow those metadatas directly embedded in
2627 // the code. Other metadatas (oop_index>0) are seen as part of
2628 // the metadata section below.
2629 assert(1 == (r->metadata_is_immediate()) +
2630 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()),
2631 "metadata must be found in exactly one place");
2632 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) {
2633 Metadata* md = r->metadata_value();
2634 if (md != _method) f->do_metadata(md);
2635 }
2636 } else if (iter.type() == relocInfo::virtual_call_type) {
2637 // Check compiledIC holders associated with this nmethod
2638 ResourceMark rm;
2639 CompiledIC *ic = CompiledIC_at(&iter);
2640 ic->metadata_do(f);
2641 }
2642 }
2643 }
2644
2645 // Visit the metadata section
2646 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
2647 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops
2648 Metadata* md = *p;
2649 f->do_metadata(md);
2650 }
2651
2652 // Visit metadata not embedded in the other places.
2653 if (_method != nullptr) f->do_metadata(_method);
2654 }
2655
2656 // Heuristic for nuking nmethods even though their oops are live.
2657 // Main purpose is to reduce code cache pressure and get rid of
2658 // nmethods that don't seem to be all that relevant any longer.
2659 bool nmethod::is_cold() {
2660 if (!MethodFlushing || is_native_method() || is_not_installed()) {
2661 // No heuristic unloading at all
2662 return false;
2663 }
2664
2665 if (!is_maybe_on_stack() && is_not_entrant()) {
2666 // Not entrant nmethods that are not on any stack can just
2667 // be removed
2668 return true;
2669 }
2670
2671 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2672 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) {
2673 // On platforms that don't support nmethod entry barriers, we can't
2674 // trust the temporal aspect of the gc epochs. So we can't detect
2675 // cold nmethods on such platforms.
2676 return false;
2677 }
2678
2679 if (!UseCodeCacheFlushing) {
2680 // Bail out if we don't heuristically remove nmethods
2681 return false;
2682 }
2683
2684 // Other code can be phased out more gradually after N GCs
2685 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count();
2686 }
2687
2688 // The _is_unloading_state encodes a tuple comprising the unloading cycle
2689 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle.
2690 // This is the bit layout of the _is_unloading_state byte: 00000CCU
2691 // CC refers to the cycle, which has 2 bits, and U refers to the result of
2692 // IsUnloadingBehaviour::is_unloading() for that unloading cycle.
2693
2694 class IsUnloadingState: public AllStatic {
2695 static const uint8_t _is_unloading_mask = 1;
2696 static const uint8_t _is_unloading_shift = 0;
2697 static const uint8_t _unloading_cycle_mask = 6;
2698 static const uint8_t _unloading_cycle_shift = 1;
2699
2700 static uint8_t set_is_unloading(uint8_t state, bool value) {
2701 state &= (uint8_t)~_is_unloading_mask;
2702 if (value) {
2703 state |= 1 << _is_unloading_shift;
2704 }
2705 assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
2706 return state;
2707 }
2708
2709 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
2710 state &= (uint8_t)~_unloading_cycle_mask;
2711 state |= (uint8_t)(value << _unloading_cycle_shift);
2712 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
2713 return state;
2714 }
2715
2716 public:
2717 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
2718 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
2719
2720 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
2721 uint8_t state = 0;
2722 state = set_is_unloading(state, is_unloading);
2723 state = set_unloading_cycle(state, unloading_cycle);
2724 return state;
2725 }
2726 };
2727
2728 bool nmethod::is_unloading() {
2729 uint8_t state = AtomicAccess::load(&_is_unloading_state);
2730 bool state_is_unloading = IsUnloadingState::is_unloading(state);
2731 if (state_is_unloading) {
2732 return true;
2733 }
2734 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
2735 uint8_t current_cycle = CodeCache::unloading_cycle();
2736 if (state_unloading_cycle == current_cycle) {
2737 return false;
2738 }
2739
2740 // The IsUnloadingBehaviour is responsible for calculating if the nmethod
2741 // should be unloaded. This can be either because there is a dead oop,
2742 // or because is_cold() heuristically determines it is time to unload.
2743 state_unloading_cycle = current_cycle;
2744 state_is_unloading = IsUnloadingBehaviour::is_unloading(this);
2745 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
2746
2747 // Note that if an nmethod has dead oops, everyone will agree that the
2748 // nmethod is_unloading. However, the is_cold heuristics can yield
2749 // different outcomes, so we guard the computed result with a CAS
2750 // to ensure all threads have a shared view of whether an nmethod
2751 // is_unloading or not.
2752 uint8_t found_state = AtomicAccess::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed);
2753
2754 if (found_state == state) {
2755 // First to change state, we win
2756 return state_is_unloading;
2757 } else {
2758 // State already set, so use it
2759 return IsUnloadingState::is_unloading(found_state);
2760 }
2761 }
2762
2763 void nmethod::clear_unloading_state() {
2764 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
2765 AtomicAccess::store(&_is_unloading_state, state);
2766 }
2767
2768
2769 // This is called at the end of the strong tracing/marking phase of a
2770 // GC to unload an nmethod if it contains otherwise unreachable
2771 // oops or is heuristically found to be not important.
2772 void nmethod::do_unloading(bool unloading_occurred) {
2773 // Make sure the oop's ready to receive visitors
2774 if (is_unloading()) {
2775 unlink();
2776 } else {
2777 unload_nmethod_caches(unloading_occurred);
2778 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2779 if (bs_nm != nullptr) {
2780 bs_nm->disarm(this);
2781 }
2782 }
2783 }
2784
2785 void nmethod::oops_do(OopClosure* f) {
2786 // Prevent extra code cache walk for platforms that don't have immediate oops.
2787 if (relocInfo::mustIterateImmediateOopsInCode()) {
2788 RelocIterator iter(this, oops_reloc_begin());
2789
2790 while (iter.next()) {
2791 if (iter.type() == relocInfo::oop_type ) {
2792 oop_Relocation* r = iter.oop_reloc();
2793 // In this loop, we must only follow those oops directly embedded in
2794 // the code. Other oops (oop_index>0) are seen as part of scopes_oops.
2795 assert(1 == (r->oop_is_immediate()) +
2796 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()),
2797 "oop must be found in exactly one place");
2798 if (r->oop_is_immediate() && r->oop_value() != nullptr) {
2799 f->do_oop(r->oop_addr());
2800 }
2801 }
2802 }
2803 }
2804
2805 // Scopes
2806 // This includes oop constants not inlined in the code stream.
2807 for (oop* p = oops_begin(); p < oops_end(); p++) {
2808 if (*p == Universe::non_oop_word()) continue; // skip non-oops
2809 f->do_oop(p);
2810 }
2811 }
2812
2813 void nmethod::follow_nmethod(OopIterateClosure* cl) {
2814 // Process oops in the nmethod
2815 oops_do(cl);
2816
2817 // CodeCache unloading support
2818 mark_as_maybe_on_stack();
2819
2820 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
2821 bs_nm->disarm(this);
2822
2823 // There's an assumption made that this function is not used by GCs that
2824 // relocate objects, and therefore we don't call fix_oop_relocations.
2825 }
2826
2827 nmethod* volatile nmethod::_oops_do_mark_nmethods;
2828
2829 void nmethod::oops_do_log_change(const char* state) {
2830 LogTarget(Trace, gc, nmethod) lt;
2831 if (lt.is_enabled()) {
2832 LogStream ls(lt);
2833 CompileTask::print(&ls, this, state, true /* short_form */);
2834 }
2835 }
2836
2837 bool nmethod::oops_do_try_claim() {
2838 if (oops_do_try_claim_weak_request()) {
2839 nmethod* result = oops_do_try_add_to_list_as_weak_done();
2840 assert(result == nullptr, "adding to global list as weak done must always succeed.");
2841 return true;
2842 }
2843 return false;
2844 }
2845
2846 bool nmethod::oops_do_try_claim_weak_request() {
2847 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2848
2849 if ((_oops_do_mark_link == nullptr) &&
2850 (AtomicAccess::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) {
2851 oops_do_log_change("oops_do, mark weak request");
2852 return true;
2853 }
2854 return false;
2855 }
2856
2857 void nmethod::oops_do_set_strong_done(nmethod* old_head) {
2858 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag);
2859 }
2860
2861 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() {
2862 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2863
2864 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(nullptr, claim_weak_request_tag), mark_link(this, claim_strong_done_tag));
2865 if (old_next == nullptr) {
2866 oops_do_log_change("oops_do, mark strong done");
2867 }
2868 return old_next;
2869 }
2870
2871 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) {
2872 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2873 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak");
2874
2875 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag));
2876 if (old_next == next) {
2877 oops_do_log_change("oops_do, mark strong request");
2878 }
2879 return old_next;
2880 }
2881
2882 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) {
2883 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2884 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done");
2885
2886 oops_do_mark_link* old_next = AtomicAccess::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag));
2887 if (old_next == next) {
2888 oops_do_log_change("oops_do, mark weak done -> mark strong done");
2889 return true;
2890 }
2891 return false;
2892 }
2893
2894 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() {
2895 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2896
2897 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag ||
2898 extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2899 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2900
2901 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2902 // Self-loop if needed.
2903 if (old_head == nullptr) {
2904 old_head = this;
2905 }
2906 // Try to install end of list and weak done tag.
2907 if (AtomicAccess::cmpxchg(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag), mark_link(old_head, claim_weak_done_tag)) == mark_link(this, claim_weak_request_tag)) {
2908 oops_do_log_change("oops_do, mark weak done");
2909 return nullptr;
2910 } else {
2911 return old_head;
2912 }
2913 }
2914
2915 void nmethod::oops_do_add_to_list_as_strong_done() {
2916 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint");
2917
2918 nmethod* old_head = AtomicAccess::xchg(&_oops_do_mark_nmethods, this);
2919 // Self-loop if needed.
2920 if (old_head == nullptr) {
2921 old_head = this;
2922 }
2923 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u",
2924 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link));
2925
2926 oops_do_set_strong_done(old_head);
2927 }
2928
2929 void nmethod::oops_do_process_weak(OopsDoProcessor* p) {
2930 if (!oops_do_try_claim_weak_request()) {
2931 // Failed to claim for weak processing.
2932 oops_do_log_change("oops_do, mark weak request fail");
2933 return;
2934 }
2935
2936 p->do_regular_processing(this);
2937
2938 nmethod* old_head = oops_do_try_add_to_list_as_weak_done();
2939 if (old_head == nullptr) {
2940 return;
2941 }
2942 oops_do_log_change("oops_do, mark weak done fail");
2943 // Adding to global list failed, another thread added a strong request.
2944 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag,
2945 "must be but is %u", extract_state(_oops_do_mark_link));
2946
2947 oops_do_log_change("oops_do, mark weak request -> mark strong done");
2948
2949 oops_do_set_strong_done(old_head);
2950 // Do missing strong processing.
2951 p->do_remaining_strong_processing(this);
2952 }
2953
2954 void nmethod::oops_do_process_strong(OopsDoProcessor* p) {
2955 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done();
2956 if (next_raw == nullptr) {
2957 p->do_regular_processing(this);
2958 oops_do_add_to_list_as_strong_done();
2959 return;
2960 }
2961 // Claim failed. Figure out why and handle it.
2962 if (oops_do_has_weak_request(next_raw)) {
2963 oops_do_mark_link* old = next_raw;
2964 // Claim failed because being weak processed (state == "weak request").
2965 // Try to request deferred strong processing.
2966 next_raw = oops_do_try_add_strong_request(old);
2967 if (next_raw == old) {
2968 // Successfully requested deferred strong processing.
2969 return;
2970 }
2971 // Failed because of a concurrent transition. No longer in "weak request" state.
2972 }
2973 if (oops_do_has_any_strong_state(next_raw)) {
2974 // Already claimed for strong processing or requested for such.
2975 return;
2976 }
2977 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) {
2978 // Successfully claimed "weak done" as "strong done". Do the missing marking.
2979 p->do_remaining_strong_processing(this);
2980 return;
2981 }
2982 // Claim failed, some other thread got it.
2983 }
2984
2985 void nmethod::oops_do_marking_prologue() {
2986 assert_at_safepoint();
2987
2988 log_trace(gc, nmethod)("oops_do_marking_prologue");
2989 assert(_oops_do_mark_nmethods == nullptr, "must be empty");
2990 }
2991
2992 void nmethod::oops_do_marking_epilogue() {
2993 assert_at_safepoint();
2994
2995 nmethod* next = _oops_do_mark_nmethods;
2996 _oops_do_mark_nmethods = nullptr;
2997 if (next != nullptr) {
2998 nmethod* cur;
2999 do {
3000 cur = next;
3001 next = extract_nmethod(cur->_oops_do_mark_link);
3002 cur->_oops_do_mark_link = nullptr;
3003 DEBUG_ONLY(cur->verify_oop_relocations());
3004
3005 LogTarget(Trace, gc, nmethod) lt;
3006 if (lt.is_enabled()) {
3007 LogStream ls(lt);
3008 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true);
3009 }
3010 // End if self-loop has been detected.
3011 } while (cur != next);
3012 }
3013 log_trace(gc, nmethod)("oops_do_marking_epilogue");
3014 }
3015
3016 inline bool includes(void* p, void* from, void* to) {
3017 return from <= p && p < to;
3018 }
3019
3020
3021 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) {
3022 assert(count >= 2, "must be sentinel values, at least");
3023
3024 #ifdef ASSERT
3025 // must be sorted and unique; we do a binary search in find_pc_desc()
3026 int prev_offset = pcs[0].pc_offset();
3027 assert(prev_offset == PcDesc::lower_offset_limit,
3028 "must start with a sentinel");
3029 for (int i = 1; i < count; i++) {
3030 int this_offset = pcs[i].pc_offset();
3031 assert(this_offset > prev_offset, "offsets must be sorted");
3032 prev_offset = this_offset;
3033 }
3034 assert(prev_offset == PcDesc::upper_offset_limit,
3035 "must end with a sentinel");
3036 #endif //ASSERT
3037
3038 int size = count * sizeof(PcDesc);
3039 assert(scopes_pcs_size() >= size, "oob");
3040 memcpy(scopes_pcs_begin(), pcs, size);
3041
3042 // Adjust the final sentinel downward.
3043 PcDesc* last_pc = &scopes_pcs_begin()[count-1];
3044 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity");
3045 last_pc->set_pc_offset(content_size() + 1);
3046 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) {
3047 // Fill any rounding gaps with copies of the last record.
3048 last_pc[1] = last_pc[0];
3049 }
3050 // The following assert could fail if sizeof(PcDesc) is not
3051 // an integral multiple of oopSize (the rounding term).
3052 // If it fails, change the logic to always allocate a multiple
3053 // of sizeof(PcDesc), and fill unused words with copies of *last_pc.
3054 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly");
3055 }
3056
3057 void nmethod::copy_scopes_data(u_char* buffer, int size) {
3058 assert(scopes_data_size() >= size, "oob");
3059 memcpy(scopes_data_begin(), buffer, size);
3060 }
3061
3062 #ifdef ASSERT
3063 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) {
3064 PcDesc* res = nullptr;
3065 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit,
3066 "must start with a sentinel");
3067 // lower + 1 to exclude initial sentinel
3068 for (PcDesc* p = lower + 1; p < upper; p++) {
3069 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc
3070 if (match_desc(p, pc_offset, approximate)) {
3071 if (res == nullptr) {
3072 res = p;
3073 } else {
3074 res = (PcDesc*) badAddress;
3075 }
3076 }
3077 }
3078 return res;
3079 }
3080 #endif
3081
3082
3083 #ifndef PRODUCT
3084 // Version of method to collect statistic
3085 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin,
3086 PcDesc* lower, PcDesc* upper) {
3087 ++pc_nmethod_stats.pc_desc_queries;
3088 if (approximate) ++pc_nmethod_stats.pc_desc_approx;
3089
3090 PcDesc* desc = _pc_desc_cache.last_pc_desc();
3091 assert(desc != nullptr, "PcDesc cache should be initialized already");
3092 if (desc->pc_offset() == (pc - code_begin)) {
3093 // Cached value matched
3094 ++pc_nmethod_stats.pc_desc_tests;
3095 ++pc_nmethod_stats.pc_desc_repeats;
3096 return desc;
3097 }
3098 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper);
3099 }
3100 #endif
3101
3102 // Finds a PcDesc with real-pc equal to "pc"
3103 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin,
3104 PcDesc* lower_incl, PcDesc* upper_incl) {
3105 if ((pc < code_begin) ||
3106 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) {
3107 return nullptr; // PC is wildly out of range
3108 }
3109 int pc_offset = (int) (pc - code_begin);
3110
3111 // Check the PcDesc cache if it contains the desired PcDesc
3112 // (This as an almost 100% hit rate.)
3113 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate);
3114 if (res != nullptr) {
3115 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok");
3116 return res;
3117 }
3118
3119 // Fallback algorithm: quasi-linear search for the PcDesc
3120 // Find the last pc_offset less than the given offset.
3121 // The successor must be the required match, if there is a match at all.
3122 // (Use a fixed radix to avoid expensive affine pointer arithmetic.)
3123 PcDesc* lower = lower_incl; // this is initial sentinel
3124 PcDesc* upper = upper_incl - 1; // exclude final sentinel
3125 if (lower >= upper) return nullptr; // no PcDescs at all
3126
3127 #define assert_LU_OK \
3128 /* invariant on lower..upper during the following search: */ \
3129 assert(lower->pc_offset() < pc_offset, "sanity"); \
3130 assert(upper->pc_offset() >= pc_offset, "sanity")
3131 assert_LU_OK;
3132
3133 // Use the last successful return as a split point.
3134 PcDesc* mid = _pc_desc_cache.last_pc_desc();
3135 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3136 if (mid->pc_offset() < pc_offset) {
3137 lower = mid;
3138 } else {
3139 upper = mid;
3140 }
3141
3142 // Take giant steps at first (4096, then 256, then 16, then 1)
3143 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ DEBUG_ONLY(-1);
3144 const int RADIX = (1 << LOG2_RADIX);
3145 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) {
3146 while ((mid = lower + step) < upper) {
3147 assert_LU_OK;
3148 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3149 if (mid->pc_offset() < pc_offset) {
3150 lower = mid;
3151 } else {
3152 upper = mid;
3153 break;
3154 }
3155 }
3156 assert_LU_OK;
3157 }
3158
3159 // Sneak up on the value with a linear search of length ~16.
3160 while (true) {
3161 assert_LU_OK;
3162 mid = lower + 1;
3163 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches);
3164 if (mid->pc_offset() < pc_offset) {
3165 lower = mid;
3166 } else {
3167 upper = mid;
3168 break;
3169 }
3170 }
3171 #undef assert_LU_OK
3172
3173 if (match_desc(upper, pc_offset, approximate)) {
3174 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3175 if (!Thread::current_in_asgct()) {
3176 // we don't want to modify the cache if we're in ASGCT
3177 // which is typically called in a signal handler
3178 _pc_desc_cache.add_pc_desc(upper);
3179 }
3180 return upper;
3181 } else {
3182 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch");
3183 return nullptr;
3184 }
3185 }
3186
3187 bool nmethod::check_dependency_on(DepChange& changes) {
3188 // What has happened:
3189 // 1) a new class dependee has been added
3190 // 2) dependee and all its super classes have been marked
3191 bool found_check = false; // set true if we are upset
3192 for (Dependencies::DepStream deps(this); deps.next(); ) {
3193 // Evaluate only relevant dependencies.
3194 if (deps.spot_check_dependency_at(changes) != nullptr) {
3195 found_check = true;
3196 NOT_DEBUG(break);
3197 }
3198 }
3199 return found_check;
3200 }
3201
3202 // Called from mark_for_deoptimization, when dependee is invalidated.
3203 bool nmethod::is_dependent_on_method(Method* dependee) {
3204 for (Dependencies::DepStream deps(this); deps.next(); ) {
3205 if (Dependencies::has_method_dep(deps.type())) {
3206 Method* method = deps.method_argument(0);
3207 if (method == dependee) return true;
3208 }
3209 }
3210 return false;
3211 }
3212
3213 void nmethod_init() {
3214 // make sure you didn't forget to adjust the filler fields
3215 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word");
3216 }
3217
3218 // -----------------------------------------------------------------------------
3219 // Verification
3220
3221 class VerifyOopsClosure: public OopClosure {
3222 nmethod* _nm;
3223 bool _ok;
3224 public:
3225 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { }
3226 bool ok() { return _ok; }
3227 virtual void do_oop(oop* p) {
3228 if (oopDesc::is_oop_or_null(*p)) return;
3229 // Print diagnostic information before calling print_nmethod().
3230 // Assertions therein might prevent call from returning.
3231 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)",
3232 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm));
3233 if (_ok) {
3234 _nm->print_nmethod(true);
3235 _ok = false;
3236 }
3237 }
3238 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
3239 };
3240
3241 class VerifyMetadataClosure: public MetadataClosure {
3242 public:
3243 void do_metadata(Metadata* md) {
3244 if (md->is_method()) {
3245 Method* method = (Method*)md;
3246 assert(!method->is_old(), "Should not be installing old methods");
3247 }
3248 }
3249 };
3250
3251
3252 void nmethod::verify() {
3253 if (is_not_entrant())
3254 return;
3255
3256 // assert(oopDesc::is_oop(method()), "must be valid");
3257
3258 ResourceMark rm;
3259
3260 if (!CodeCache::contains(this)) {
3261 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this));
3262 }
3263
3264 if(is_native_method() )
3265 return;
3266
3267 nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
3268 if (nm != this) {
3269 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this));
3270 }
3271
3272 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3273 if (! p->verify(this)) {
3274 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this));
3275 }
3276 }
3277
3278 #ifdef ASSERT
3279 #if INCLUDE_JVMCI
3280 {
3281 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap
3282 ImmutableOopMapSet* oms = oop_maps();
3283 ImplicitExceptionTable implicit_table(this);
3284 for (uint i = 0; i < implicit_table.len(); i++) {
3285 int exec_offset = (int) implicit_table.get_exec_offset(i);
3286 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) {
3287 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc");
3288 bool found = false;
3289 for (int i = 0, imax = oms->count(); i < imax; i++) {
3290 if (oms->pair_at(i)->pc_offset() == exec_offset) {
3291 found = true;
3292 break;
3293 }
3294 }
3295 assert(found, "missing oopmap");
3296 }
3297 }
3298 }
3299 #endif
3300 #endif
3301
3302 VerifyOopsClosure voc(this);
3303 oops_do(&voc);
3304 assert(voc.ok(), "embedded oops must be OK");
3305 Universe::heap()->verify_nmethod(this);
3306
3307 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT,
3308 nm->method()->external_name(), p2i(_oops_do_mark_link));
3309 verify_scopes();
3310
3311 CompiledICLocker nm_verify(this);
3312 VerifyMetadataClosure vmc;
3313 metadata_do(&vmc);
3314 }
3315
3316
3317 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) {
3318
3319 // Verify IC only when nmethod installation is finished.
3320 if (!is_not_installed()) {
3321 if (CompiledICLocker::is_safe(this)) {
3322 if (is_inline_cache) {
3323 CompiledIC_at(this, call_site);
3324 } else {
3325 CompiledDirectCall::at(call_site);
3326 }
3327 } else {
3328 CompiledICLocker ml_verify(this);
3329 if (is_inline_cache) {
3330 CompiledIC_at(this, call_site);
3331 } else {
3332 CompiledDirectCall::at(call_site);
3333 }
3334 }
3335 }
3336
3337 HandleMark hm(Thread::current());
3338
3339 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address());
3340 assert(pd != nullptr, "PcDesc must exist");
3341 for (ScopeDesc* sd = new ScopeDesc(this, pd);
3342 !sd->is_top(); sd = sd->sender()) {
3343 sd->verify();
3344 }
3345 }
3346
3347 void nmethod::verify_scopes() {
3348 if( !method() ) return; // Runtime stubs have no scope
3349 if (method()->is_native()) return; // Ignore stub methods.
3350 // iterate through all interrupt point
3351 // and verify the debug information is valid.
3352 RelocIterator iter(this);
3353 while (iter.next()) {
3354 address stub = nullptr;
3355 switch (iter.type()) {
3356 case relocInfo::virtual_call_type:
3357 verify_interrupt_point(iter.addr(), true /* is_inline_cache */);
3358 break;
3359 case relocInfo::opt_virtual_call_type:
3360 stub = iter.opt_virtual_call_reloc()->static_stub();
3361 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3362 break;
3363 case relocInfo::static_call_type:
3364 stub = iter.static_call_reloc()->static_stub();
3365 verify_interrupt_point(iter.addr(), false /* is_inline_cache */);
3366 break;
3367 case relocInfo::runtime_call_type:
3368 case relocInfo::runtime_call_w_cp_type: {
3369 address destination = iter.reloc()->value();
3370 // Right now there is no way to find out which entries support
3371 // an interrupt point. It would be nice if we had this
3372 // information in a table.
3373 break;
3374 }
3375 default:
3376 break;
3377 }
3378 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section");
3379 }
3380 }
3381
3382
3383 // -----------------------------------------------------------------------------
3384 // Printing operations
3385
3386 void nmethod::print_on_impl(outputStream* st) const {
3387 ResourceMark rm;
3388
3389 st->print("Compiled method ");
3390
3391 if (is_compiled_by_c1()) {
3392 st->print("(c1) ");
3393 } else if (is_compiled_by_c2()) {
3394 st->print("(c2) ");
3395 } else if (is_compiled_by_jvmci()) {
3396 st->print("(JVMCI) ");
3397 } else {
3398 st->print("(n/a) ");
3399 }
3400
3401 print_on_with_msg(st, nullptr);
3402
3403 if (WizardMode) {
3404 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this));
3405 st->print(" for method " INTPTR_FORMAT , p2i(method()));
3406 st->print(" { ");
3407 st->print_cr("%s ", state());
3408 st->print_cr("}:");
3409 }
3410 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3411 p2i(this),
3412 p2i(this) + size(),
3413 size());
3414 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3415 p2i(consts_begin()),
3416 p2i(consts_end()),
3417 consts_size());
3418 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3419 p2i(insts_begin()),
3420 p2i(insts_end()),
3421 insts_size());
3422 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3423 p2i(stub_begin()),
3424 p2i(stub_end()),
3425 stub_size());
3426 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3427 p2i(oops_begin()),
3428 p2i(oops_end()),
3429 oops_size());
3430 if (mutable_data_size() > 0) st->print_cr(" mutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3431 p2i(mutable_data_begin()),
3432 p2i(mutable_data_end()),
3433 mutable_data_size());
3434 if (relocation_size() > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3435 p2i(relocation_begin()),
3436 p2i(relocation_end()),
3437 relocation_size());
3438 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3439 p2i(metadata_begin()),
3440 p2i(metadata_end()),
3441 metadata_size());
3442 #if INCLUDE_JVMCI
3443 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3444 p2i(jvmci_data_begin()),
3445 p2i(jvmci_data_end()),
3446 jvmci_data_size());
3447 #endif
3448 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3449 p2i(immutable_data_begin()),
3450 p2i(immutable_data_end()),
3451 immutable_data_size());
3452 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3453 p2i(dependencies_begin()),
3454 p2i(dependencies_end()),
3455 dependencies_size());
3456 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3457 p2i(nul_chk_table_begin()),
3458 p2i(nul_chk_table_end()),
3459 nul_chk_table_size());
3460 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3461 p2i(handler_table_begin()),
3462 p2i(handler_table_end()),
3463 handler_table_size());
3464 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3465 p2i(scopes_pcs_begin()),
3466 p2i(scopes_pcs_end()),
3467 scopes_pcs_size());
3468 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3469 p2i(scopes_data_begin()),
3470 p2i(scopes_data_end()),
3471 scopes_data_size());
3472 #if INCLUDE_JVMCI
3473 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
3474 p2i(speculations_begin()),
3475 p2i(speculations_end()),
3476 speculations_size());
3477 #endif
3478 }
3479
3480 void nmethod::print_code() {
3481 ResourceMark m;
3482 ttyLocker ttyl;
3483 // Call the specialized decode method of this class.
3484 decode(tty);
3485 }
3486
3487 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN
3488
3489 void nmethod::print_dependencies_on(outputStream* out) {
3490 ResourceMark rm;
3491 stringStream st;
3492 st.print_cr("Dependencies:");
3493 for (Dependencies::DepStream deps(this); deps.next(); ) {
3494 deps.print_dependency(&st);
3495 InstanceKlass* ctxk = deps.context_type();
3496 if (ctxk != nullptr) {
3497 if (ctxk->is_dependent_nmethod(this)) {
3498 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name());
3499 }
3500 }
3501 deps.log_dependency(); // put it into the xml log also
3502 }
3503 out->print_raw(st.as_string());
3504 }
3505 #endif
3506
3507 #if defined(SUPPORT_DATA_STRUCTS)
3508
3509 // Print the oops from the underlying CodeBlob.
3510 void nmethod::print_oops(outputStream* st) {
3511 ResourceMark m;
3512 st->print("Oops:");
3513 if (oops_begin() < oops_end()) {
3514 st->cr();
3515 for (oop* p = oops_begin(); p < oops_end(); p++) {
3516 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false);
3517 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3518 if (Universe::contains_non_oop_word(p)) {
3519 st->print_cr("NON_OOP");
3520 continue; // skip non-oops
3521 }
3522 if (*p == nullptr) {
3523 st->print_cr("nullptr-oop");
3524 continue; // skip non-oops
3525 }
3526 (*p)->print_value_on(st);
3527 st->cr();
3528 }
3529 } else {
3530 st->print_cr(" <list empty>");
3531 }
3532 }
3533
3534 // Print metadata pool.
3535 void nmethod::print_metadata(outputStream* st) {
3536 ResourceMark m;
3537 st->print("Metadata:");
3538 if (metadata_begin() < metadata_end()) {
3539 st->cr();
3540 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) {
3541 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false);
3542 st->print(PTR_FORMAT " ", *((uintptr_t*)p));
3543 if (*p && *p != Universe::non_oop_word()) {
3544 (*p)->print_value_on(st);
3545 }
3546 st->cr();
3547 }
3548 } else {
3549 st->print_cr(" <list empty>");
3550 }
3551 }
3552
3553 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN
3554 void nmethod::print_scopes_on(outputStream* st) {
3555 // Find the first pc desc for all scopes in the code and print it.
3556 ResourceMark rm;
3557 st->print("scopes:");
3558 if (scopes_pcs_begin() < scopes_pcs_end()) {
3559 st->cr();
3560 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3561 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null)
3562 continue;
3563
3564 ScopeDesc* sd = scope_desc_at(p->real_pc(this));
3565 while (sd != nullptr) {
3566 sd->print_on(st, p); // print output ends with a newline
3567 sd = sd->sender();
3568 }
3569 }
3570 } else {
3571 st->print_cr(" <list empty>");
3572 }
3573 }
3574 #endif
3575
3576 #ifndef PRODUCT // RelocIterator does support printing only then.
3577 void nmethod::print_relocations() {
3578 ResourceMark m; // in case methods get printed via the debugger
3579 tty->print_cr("relocations:");
3580 RelocIterator iter(this);
3581 iter.print_on(tty);
3582 }
3583 #endif
3584
3585 void nmethod::print_pcs_on(outputStream* st) {
3586 ResourceMark m; // in case methods get printed via debugger
3587 st->print("pc-bytecode offsets:");
3588 if (scopes_pcs_begin() < scopes_pcs_end()) {
3589 st->cr();
3590 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) {
3591 p->print_on(st, this); // print output ends with a newline
3592 }
3593 } else {
3594 st->print_cr(" <list empty>");
3595 }
3596 }
3597
3598 void nmethod::print_handler_table() {
3599 ExceptionHandlerTable(this).print(code_begin());
3600 }
3601
3602 void nmethod::print_nul_chk_table() {
3603 ImplicitExceptionTable(this).print(code_begin());
3604 }
3605
3606 void nmethod::print_recorded_oop(int log_n, int i) {
3607 void* value;
3608
3609 if (i == 0) {
3610 value = nullptr;
3611 } else {
3612 // Be careful around non-oop words. Don't create an oop
3613 // with that value, or it will assert in verification code.
3614 if (Universe::contains_non_oop_word(oop_addr_at(i))) {
3615 value = Universe::non_oop_word();
3616 } else {
3617 value = oop_at(i);
3618 }
3619 }
3620
3621 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value));
3622
3623 if (value == Universe::non_oop_word()) {
3624 tty->print("non-oop word");
3625 } else {
3626 if (value == nullptr) {
3627 tty->print("nullptr-oop");
3628 } else {
3629 oop_at(i)->print_value_on(tty);
3630 }
3631 }
3632
3633 tty->cr();
3634 }
3635
3636 void nmethod::print_recorded_oops() {
3637 const int n = oops_count();
3638 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3639 tty->print("Recorded oops:");
3640 if (n > 0) {
3641 tty->cr();
3642 for (int i = 0; i < n; i++) {
3643 print_recorded_oop(log_n, i);
3644 }
3645 } else {
3646 tty->print_cr(" <list empty>");
3647 }
3648 }
3649
3650 void nmethod::print_recorded_metadata() {
3651 const int n = metadata_count();
3652 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6;
3653 tty->print("Recorded metadata:");
3654 if (n > 0) {
3655 tty->cr();
3656 for (int i = 0; i < n; i++) {
3657 Metadata* m = metadata_at(i);
3658 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m));
3659 if (m == (Metadata*)Universe::non_oop_word()) {
3660 tty->print("non-metadata word");
3661 } else if (m == nullptr) {
3662 tty->print("nullptr-oop");
3663 } else {
3664 Metadata::print_value_on_maybe_null(tty, m);
3665 }
3666 tty->cr();
3667 }
3668 } else {
3669 tty->print_cr(" <list empty>");
3670 }
3671 }
3672 #endif
3673
3674 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3675
3676 void nmethod::print_constant_pool(outputStream* st) {
3677 //-----------------------------------
3678 //---< Print the constant pool >---
3679 //-----------------------------------
3680 int consts_size = this->consts_size();
3681 if ( consts_size > 0 ) {
3682 unsigned char* cstart = this->consts_begin();
3683 unsigned char* cp = cstart;
3684 unsigned char* cend = cp + consts_size;
3685 unsigned int bytes_per_line = 4;
3686 unsigned int CP_alignment = 8;
3687 unsigned int n;
3688
3689 st->cr();
3690
3691 //---< print CP header to make clear what's printed >---
3692 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) {
3693 n = bytes_per_line;
3694 st->print_cr("[Constant Pool]");
3695 Disassembler::print_location(cp, cstart, cend, st, true, true);
3696 Disassembler::print_hexdata(cp, n, st, true);
3697 st->cr();
3698 } else {
3699 n = (int)((uintptr_t)cp & (bytes_per_line-1));
3700 st->print_cr("[Constant Pool (unaligned)]");
3701 }
3702
3703 //---< print CP contents, bytes_per_line at a time >---
3704 while (cp < cend) {
3705 Disassembler::print_location(cp, cstart, cend, st, true, false);
3706 Disassembler::print_hexdata(cp, n, st, false);
3707 cp += n;
3708 n = bytes_per_line;
3709 st->cr();
3710 }
3711
3712 //---< Show potential alignment gap between constant pool and code >---
3713 cend = code_begin();
3714 if( cp < cend ) {
3715 n = 4;
3716 st->print_cr("[Code entry alignment]");
3717 while (cp < cend) {
3718 Disassembler::print_location(cp, cstart, cend, st, false, false);
3719 cp += n;
3720 st->cr();
3721 }
3722 }
3723 } else {
3724 st->print_cr("[Constant Pool (empty)]");
3725 }
3726 st->cr();
3727 }
3728
3729 #endif
3730
3731 // Disassemble this nmethod.
3732 // Print additional debug information, if requested. This could be code
3733 // comments, block comments, profiling counters, etc.
3734 // The undisassembled format is useful no disassembler library is available.
3735 // The resulting hex dump (with markers) can be disassembled later, or on
3736 // another system, when/where a disassembler library is available.
3737 void nmethod::decode2(outputStream* ost) const {
3738
3739 // Called from frame::back_trace_with_decode without ResourceMark.
3740 ResourceMark rm;
3741
3742 // Make sure we have a valid stream to print on.
3743 outputStream* st = ost ? ost : tty;
3744
3745 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY)
3746 const bool use_compressed_format = true;
3747 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3748 AbstractDisassembler::show_block_comment());
3749 #else
3750 const bool use_compressed_format = Disassembler::is_abstract();
3751 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() ||
3752 AbstractDisassembler::show_block_comment());
3753 #endif
3754
3755 st->cr();
3756 this->print_on(st);
3757 st->cr();
3758
3759 #if defined(SUPPORT_ASSEMBLY)
3760 //----------------------------------
3761 //---< Print real disassembly >---
3762 //----------------------------------
3763 if (! use_compressed_format) {
3764 st->print_cr("[Disassembly]");
3765 Disassembler::decode(const_cast<nmethod*>(this), st);
3766 st->bol();
3767 st->print_cr("[/Disassembly]");
3768 return;
3769 }
3770 #endif
3771
3772 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3773
3774 // Compressed undisassembled disassembly format.
3775 // The following status values are defined/supported:
3776 // = 0 - currently at bol() position, nothing printed yet on current line.
3777 // = 1 - currently at position after print_location().
3778 // > 1 - in the midst of printing instruction stream bytes.
3779 int compressed_format_idx = 0;
3780 int code_comment_column = 0;
3781 const int instr_maxlen = Assembler::instr_maxlen();
3782 const uint tabspacing = 8;
3783 unsigned char* start = this->code_begin();
3784 unsigned char* p = this->code_begin();
3785 unsigned char* end = this->code_end();
3786 unsigned char* pss = p; // start of a code section (used for offsets)
3787
3788 if ((start == nullptr) || (end == nullptr)) {
3789 st->print_cr("PrintAssembly not possible due to uninitialized section pointers");
3790 return;
3791 }
3792 #endif
3793
3794 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3795 //---< plain abstract disassembly, no comments or anything, just section headers >---
3796 if (use_compressed_format && ! compressed_with_comments) {
3797 const_cast<nmethod*>(this)->print_constant_pool(st);
3798
3799 st->bol();
3800 st->cr();
3801 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3802 //---< Open the output (Marker for post-mortem disassembler) >---
3803 st->print_cr("[MachCode]");
3804 const char* header = nullptr;
3805 address p0 = p;
3806 while (p < end) {
3807 address pp = p;
3808 while ((p < end) && (header == nullptr)) {
3809 header = nmethod_section_label(p);
3810 pp = p;
3811 p += Assembler::instr_len(p);
3812 }
3813 if (pp > p0) {
3814 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen());
3815 p0 = pp;
3816 p = pp;
3817 header = nullptr;
3818 } else if (header != nullptr) {
3819 st->bol();
3820 st->print_cr("%s", header);
3821 header = nullptr;
3822 }
3823 }
3824 //---< Close the output (Marker for post-mortem disassembler) >---
3825 st->bol();
3826 st->print_cr("[/MachCode]");
3827 return;
3828 }
3829 #endif
3830
3831 #if defined(SUPPORT_ABSTRACT_ASSEMBLY)
3832 //---< abstract disassembly with comments and section headers merged in >---
3833 if (compressed_with_comments) {
3834 const_cast<nmethod*>(this)->print_constant_pool(st);
3835
3836 st->bol();
3837 st->cr();
3838 st->print_cr("Loading hsdis library failed, undisassembled code is shown in MachCode section");
3839 //---< Open the output (Marker for post-mortem disassembler) >---
3840 st->print_cr("[MachCode]");
3841 while ((p < end) && (p != nullptr)) {
3842 const int instruction_size_in_bytes = Assembler::instr_len(p);
3843
3844 //---< Block comments for nmethod. Interrupts instruction stream, if any. >---
3845 // Outputs a bol() before and a cr() after, but only if a comment is printed.
3846 // Prints nmethod_section_label as well.
3847 if (AbstractDisassembler::show_block_comment()) {
3848 print_block_comment(st, p);
3849 if (st->position() == 0) {
3850 compressed_format_idx = 0;
3851 }
3852 }
3853
3854 //---< New location information after line break >---
3855 if (compressed_format_idx == 0) {
3856 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3857 compressed_format_idx = 1;
3858 }
3859
3860 //---< Code comment for current instruction. Address range [p..(p+len)) >---
3861 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes;
3862 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end
3863
3864 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) {
3865 //---< interrupt instruction byte stream for code comment >---
3866 if (compressed_format_idx > 1) {
3867 st->cr(); // interrupt byte stream
3868 st->cr(); // add an empty line
3869 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3870 }
3871 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end );
3872 st->bol();
3873 compressed_format_idx = 0;
3874 }
3875
3876 //---< New location information after line break >---
3877 if (compressed_format_idx == 0) {
3878 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false);
3879 compressed_format_idx = 1;
3880 }
3881
3882 //---< Nicely align instructions for readability >---
3883 if (compressed_format_idx > 1) {
3884 Disassembler::print_delimiter(st);
3885 }
3886
3887 //---< Now, finally, print the actual instruction bytes >---
3888 unsigned char* p0 = p;
3889 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen);
3890 compressed_format_idx += (int)(p - p0);
3891
3892 if (Disassembler::start_newline(compressed_format_idx-1)) {
3893 st->cr();
3894 compressed_format_idx = 0;
3895 }
3896 }
3897 //---< Close the output (Marker for post-mortem disassembler) >---
3898 st->bol();
3899 st->print_cr("[/MachCode]");
3900 return;
3901 }
3902 #endif
3903 }
3904
3905 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
3906
3907 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) {
3908 RelocIterator iter(this, begin, end);
3909 bool have_one = false;
3910 while (iter.next()) {
3911 have_one = true;
3912 switch (iter.type()) {
3913 case relocInfo::none: {
3914 // Skip it and check next
3915 break;
3916 }
3917 case relocInfo::oop_type: {
3918 // Get a non-resizable resource-allocated stringStream.
3919 // Our callees make use of (nested) ResourceMarks.
3920 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024);
3921 oop_Relocation* r = iter.oop_reloc();
3922 oop obj = r->oop_value();
3923 st.print("oop(");
3924 if (obj == nullptr) st.print("nullptr");
3925 else obj->print_value_on(&st);
3926 st.print(")");
3927 return st.as_string();
3928 }
3929 case relocInfo::metadata_type: {
3930 stringStream st;
3931 metadata_Relocation* r = iter.metadata_reloc();
3932 Metadata* obj = r->metadata_value();
3933 st.print("metadata(");
3934 if (obj == nullptr) st.print("nullptr");
3935 else obj->print_value_on(&st);
3936 st.print(")");
3937 return st.as_string();
3938 }
3939 case relocInfo::runtime_call_type:
3940 case relocInfo::runtime_call_w_cp_type: {
3941 stringStream st;
3942 st.print("runtime_call");
3943 CallRelocation* r = (CallRelocation*)iter.reloc();
3944 address dest = r->destination();
3945 if (StubRoutines::contains(dest)) {
3946 StubCodeDesc* desc = StubCodeDesc::desc_for(dest);
3947 if (desc == nullptr) {
3948 desc = StubCodeDesc::desc_for(dest + frame::pc_return_offset);
3949 }
3950 if (desc != nullptr) {
3951 st.print(" Stub::%s", desc->name());
3952 return st.as_string();
3953 }
3954 }
3955 CodeBlob* cb = CodeCache::find_blob(dest);
3956 if (cb != nullptr) {
3957 st.print(" %s", cb->name());
3958 } else {
3959 ResourceMark rm;
3960 const int buflen = 1024;
3961 char* buf = NEW_RESOURCE_ARRAY(char, buflen);
3962 int offset;
3963 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) {
3964 st.print(" %s", buf);
3965 if (offset != 0) {
3966 st.print("+%d", offset);
3967 }
3968 }
3969 }
3970 return st.as_string();
3971 }
3972 case relocInfo::virtual_call_type: {
3973 stringStream st;
3974 st.print_raw("virtual_call");
3975 virtual_call_Relocation* r = iter.virtual_call_reloc();
3976 Method* m = r->method_value();
3977 if (m != nullptr) {
3978 assert(m->is_method(), "");
3979 m->print_short_name(&st);
3980 }
3981 return st.as_string();
3982 }
3983 case relocInfo::opt_virtual_call_type: {
3984 stringStream st;
3985 st.print_raw("optimized virtual_call");
3986 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc();
3987 Method* m = r->method_value();
3988 if (m != nullptr) {
3989 assert(m->is_method(), "");
3990 m->print_short_name(&st);
3991 }
3992 return st.as_string();
3993 }
3994 case relocInfo::static_call_type: {
3995 stringStream st;
3996 st.print_raw("static_call");
3997 static_call_Relocation* r = iter.static_call_reloc();
3998 Method* m = r->method_value();
3999 if (m != nullptr) {
4000 assert(m->is_method(), "");
4001 m->print_short_name(&st);
4002 }
4003 return st.as_string();
4004 }
4005 case relocInfo::static_stub_type: return "static_stub";
4006 case relocInfo::external_word_type: return "external_word";
4007 case relocInfo::internal_word_type: return "internal_word";
4008 case relocInfo::section_word_type: return "section_word";
4009 case relocInfo::poll_type: return "poll";
4010 case relocInfo::poll_return_type: return "poll_return";
4011 case relocInfo::trampoline_stub_type: return "trampoline_stub";
4012 case relocInfo::entry_guard_type: return "entry_guard";
4013 case relocInfo::post_call_nop_type: return "post_call_nop";
4014 case relocInfo::barrier_type: {
4015 barrier_Relocation* const reloc = iter.barrier_reloc();
4016 stringStream st;
4017 st.print("barrier format=%d", reloc->format());
4018 return st.as_string();
4019 }
4020
4021 case relocInfo::type_mask: return "type_bit_mask";
4022
4023 default: {
4024 stringStream st;
4025 st.print("unknown relocInfo=%d", (int) iter.type());
4026 return st.as_string();
4027 }
4028 }
4029 }
4030 return have_one ? "other" : nullptr;
4031 }
4032
4033 // Return the last scope in (begin..end]
4034 ScopeDesc* nmethod::scope_desc_in(address begin, address end) {
4035 PcDesc* p = pc_desc_near(begin+1);
4036 if (p != nullptr && p->real_pc(this) <= end) {
4037 return new ScopeDesc(this, p);
4038 }
4039 return nullptr;
4040 }
4041
4042 const char* nmethod::nmethod_section_label(address pos) const {
4043 const char* label = nullptr;
4044 if (pos == code_begin()) label = "[Instructions begin]";
4045 if (pos == entry_point()) label = "[Entry Point]";
4046 if (pos == inline_entry_point()) label = "[Inline Entry Point]";
4047 if (pos == verified_entry_point()) label = "[Verified Entry Point]";
4048 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]";
4049 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]";
4050 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]";
4051 // Check stub_code before checking exception_handler or deopt_handler.
4052 if (pos == this->stub_begin()) label = "[Stub Code]";
4053 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]";
4054 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]";
4055 return label;
4056 }
4057
4058 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) {
4059 if (pos == entry) {
4060 stream->bol();
4061 stream->print_cr("%s", label);
4062 return 1;
4063 } else {
4064 return 0;
4065 }
4066 }
4067
4068 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const {
4069 if (print_section_labels) {
4070 int n = 0;
4071 // Multiple entry points may be at the same position. Print them all.
4072 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]");
4073 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]");
4074 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]");
4075 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]");
4076 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]");
4077 if (n == 0) {
4078 const char* label = nmethod_section_label(block_begin);
4079 if (label != nullptr) {
4080 stream->bol();
4081 stream->print_cr("%s", label);
4082 }
4083 }
4084 }
4085
4086 Method* m = method();
4087 if (m == nullptr || is_osr_method()) {
4088 return;
4089 }
4090
4091 // Print the name of the method (only once)
4092 address low = MIN3(entry_point(),
4093 verified_entry_point(),
4094 inline_entry_point());
4095 // The verified inline entry point and verified inline RO entry point are not always
4096 // used. When they are unused. CodeOffsets::Verified_Inline_Entry(_RO) is -1. Hence,
4097 // the calculated entry point is smaller than the block they are offsetting into.
4098 if (verified_inline_entry_point() >= block_begin) {
4099 low = MIN2(low, verified_inline_entry_point());
4100 }
4101 if (verified_inline_ro_entry_point() >= block_begin) {
4102 low = MIN2(low, verified_inline_ro_entry_point());
4103 }
4104 assert(low != 0, "sanity");
4105 if (block_begin == low) {
4106 stream->print(" # ");
4107 m->print_value_on(stream);
4108 stream->cr();
4109 }
4110
4111 // Print the arguments for the 3 types of verified entry points
4112 CompiledEntrySignature ces(m);
4113 ces.compute_calling_conventions(false);
4114 const GrowableArray<SigEntry>* sig_cc;
4115 const VMRegPair* regs;
4116 if (block_begin == verified_entry_point()) {
4117 sig_cc = ces.sig_cc();
4118 regs = ces.regs_cc();
4119 } else if (block_begin == verified_inline_entry_point()) {
4120 sig_cc = ces.sig();
4121 regs = ces.regs();
4122 } else if (block_begin == verified_inline_ro_entry_point()) {
4123 sig_cc = ces.sig_cc_ro();
4124 regs = ces.regs_cc_ro();
4125 } else {
4126 return;
4127 }
4128
4129 bool has_this = !m->is_static();
4130 if (ces.has_inline_recv() && block_begin == verified_entry_point()) {
4131 // <this> argument is scalarized for verified_entry_point()
4132 has_this = false;
4133 }
4134 const char* spname = "sp"; // make arch-specific?
4135 int stack_slot_offset = this->frame_size() * wordSize;
4136 int tab1 = 14, tab2 = 24;
4137 int sig_index = 0;
4138 int arg_index = has_this ? -1 : 0;
4139 bool did_old_sp = false;
4140 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) {
4141 bool at_this = (arg_index == -1);
4142 bool at_old_sp = false;
4143 BasicType t = (*sig)._bt;
4144 if (at_this) {
4145 stream->print(" # this: ");
4146 } else {
4147 stream->print(" # parm%d: ", arg_index);
4148 }
4149 stream->move_to(tab1);
4150 VMReg fst = regs[sig_index].first();
4151 VMReg snd = regs[sig_index].second();
4152 if (fst->is_reg()) {
4153 stream->print("%s", fst->name());
4154 if (snd->is_valid()) {
4155 stream->print(":%s", snd->name());
4156 }
4157 } else if (fst->is_stack()) {
4158 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset;
4159 if (offset == stack_slot_offset) at_old_sp = true;
4160 stream->print("[%s+0x%x]", spname, offset);
4161 } else {
4162 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd);
4163 }
4164 stream->print(" ");
4165 stream->move_to(tab2);
4166 stream->print("= ");
4167 if (at_this) {
4168 m->method_holder()->print_value_on(stream);
4169 } else {
4170 bool did_name = false;
4171 if (is_reference_type(t)) {
4172 Symbol* name = (*sig)._name;
4173 name->print_value_on(stream);
4174 did_name = true;
4175 }
4176 if (!did_name)
4177 stream->print("%s", type2name(t));
4178 if ((*sig)._null_marker) {
4179 stream->print(" (null marker)");
4180 }
4181 }
4182 if (at_old_sp) {
4183 stream->print(" (%s of caller)", spname);
4184 did_old_sp = true;
4185 }
4186 stream->cr();
4187 sig_index += type2size[t];
4188 arg_index += 1;
4189 }
4190 if (!did_old_sp) {
4191 stream->print(" # ");
4192 stream->move_to(tab1);
4193 stream->print("[%s+0x%x]", spname, stack_slot_offset);
4194 stream->print(" (%s of caller)", spname);
4195 stream->cr();
4196 }
4197 }
4198
4199 // Returns whether this nmethod has code comments.
4200 bool nmethod::has_code_comment(address begin, address end) {
4201 // scopes?
4202 ScopeDesc* sd = scope_desc_in(begin, end);
4203 if (sd != nullptr) return true;
4204
4205 // relocations?
4206 const char* str = reloc_string_for(begin, end);
4207 if (str != nullptr) return true;
4208
4209 // implicit exceptions?
4210 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin()));
4211 if (cont_offset != 0) return true;
4212
4213 return false;
4214 }
4215
4216 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) {
4217 ImplicitExceptionTable implicit_table(this);
4218 int pc_offset = (int)(begin - code_begin());
4219 int cont_offset = implicit_table.continuation_offset(pc_offset);
4220 bool oop_map_required = false;
4221 if (cont_offset != 0) {
4222 st->move_to(column, 6, 0);
4223 if (pc_offset == cont_offset) {
4224 st->print("; implicit exception: deoptimizes");
4225 oop_map_required = true;
4226 } else {
4227 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset));
4228 }
4229 }
4230
4231 // Find an oopmap in (begin, end]. We use the odd half-closed
4232 // interval so that oop maps and scope descs which are tied to the
4233 // byte after a call are printed with the call itself. OopMaps
4234 // associated with implicit exceptions are printed with the implicit
4235 // instruction.
4236 address base = code_begin();
4237 ImmutableOopMapSet* oms = oop_maps();
4238 if (oms != nullptr) {
4239 for (int i = 0, imax = oms->count(); i < imax; i++) {
4240 const ImmutableOopMapPair* pair = oms->pair_at(i);
4241 const ImmutableOopMap* om = pair->get_from(oms);
4242 address pc = base + pair->pc_offset();
4243 if (pc >= begin) {
4244 #if INCLUDE_JVMCI
4245 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset();
4246 #else
4247 bool is_implicit_deopt = false;
4248 #endif
4249 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) {
4250 st->move_to(column, 6, 0);
4251 st->print("; ");
4252 om->print_on(st);
4253 oop_map_required = false;
4254 }
4255 }
4256 if (pc > end) {
4257 break;
4258 }
4259 }
4260 }
4261 assert(!oop_map_required, "missed oopmap");
4262
4263 Thread* thread = Thread::current();
4264
4265 // Print any debug info present at this pc.
4266 ScopeDesc* sd = scope_desc_in(begin, end);
4267 if (sd != nullptr) {
4268 st->move_to(column, 6, 0);
4269 if (sd->bci() == SynchronizationEntryBCI) {
4270 st->print(";*synchronization entry");
4271 } else if (sd->bci() == AfterBci) {
4272 st->print(";* method exit (unlocked if synchronized)");
4273 } else if (sd->bci() == UnwindBci) {
4274 st->print(";* unwind (locked if synchronized)");
4275 } else if (sd->bci() == AfterExceptionBci) {
4276 st->print(";* unwind (unlocked if synchronized)");
4277 } else if (sd->bci() == UnknownBci) {
4278 st->print(";* unknown");
4279 } else if (sd->bci() == InvalidFrameStateBci) {
4280 st->print(";* invalid frame state");
4281 } else {
4282 if (sd->method() == nullptr) {
4283 st->print("method is nullptr");
4284 } else if (sd->method()->is_native()) {
4285 st->print("method is native");
4286 } else {
4287 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci());
4288 st->print(";*%s", Bytecodes::name(bc));
4289 switch (bc) {
4290 case Bytecodes::_invokevirtual:
4291 case Bytecodes::_invokespecial:
4292 case Bytecodes::_invokestatic:
4293 case Bytecodes::_invokeinterface:
4294 {
4295 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci());
4296 st->print(" ");
4297 if (invoke.name() != nullptr)
4298 invoke.name()->print_symbol_on(st);
4299 else
4300 st->print("<UNKNOWN>");
4301 break;
4302 }
4303 case Bytecodes::_getfield:
4304 case Bytecodes::_putfield:
4305 case Bytecodes::_getstatic:
4306 case Bytecodes::_putstatic:
4307 {
4308 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci());
4309 st->print(" ");
4310 if (field.name() != nullptr)
4311 field.name()->print_symbol_on(st);
4312 else
4313 st->print("<UNKNOWN>");
4314 }
4315 default:
4316 break;
4317 }
4318 }
4319 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized());
4320 }
4321
4322 // Print all scopes
4323 for (;sd != nullptr; sd = sd->sender()) {
4324 st->move_to(column, 6, 0);
4325 st->print("; -");
4326 if (sd->should_reexecute()) {
4327 st->print(" (reexecute)");
4328 }
4329 if (sd->method() == nullptr) {
4330 st->print("method is nullptr");
4331 } else {
4332 sd->method()->print_short_name(st);
4333 }
4334 int lineno = sd->method()->line_number_from_bci(sd->bci());
4335 if (lineno != -1) {
4336 st->print("@%d (line %d)", sd->bci(), lineno);
4337 } else {
4338 st->print("@%d", sd->bci());
4339 }
4340 st->cr();
4341 }
4342 }
4343
4344 // Print relocation information
4345 // Prevent memory leak: allocating without ResourceMark.
4346 ResourceMark rm;
4347 const char* str = reloc_string_for(begin, end);
4348 if (str != nullptr) {
4349 if (sd != nullptr) st->cr();
4350 st->move_to(column, 6, 0);
4351 st->print("; {%s}", str);
4352 }
4353 }
4354
4355 #endif
4356
4357 address nmethod::call_instruction_address(address pc) const {
4358 if (NativeCall::is_call_before(pc)) {
4359 NativeCall *ncall = nativeCall_before(pc);
4360 return ncall->instruction_address();
4361 }
4362 return nullptr;
4363 }
4364
4365 void nmethod::print_value_on_impl(outputStream* st) const {
4366 st->print_cr("nmethod");
4367 #if defined(SUPPORT_DATA_STRUCTS)
4368 print_on_with_msg(st, nullptr);
4369 #endif
4370 }
4371
4372 #ifndef PRODUCT
4373
4374 void nmethod::print_calls(outputStream* st) {
4375 RelocIterator iter(this);
4376 while (iter.next()) {
4377 switch (iter.type()) {
4378 case relocInfo::virtual_call_type: {
4379 CompiledICLocker ml_verify(this);
4380 CompiledIC_at(&iter)->print();
4381 break;
4382 }
4383 case relocInfo::static_call_type:
4384 case relocInfo::opt_virtual_call_type:
4385 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr()));
4386 CompiledDirectCall::at(iter.reloc())->print();
4387 break;
4388 default:
4389 break;
4390 }
4391 }
4392 }
4393
4394 void nmethod::print_statistics() {
4395 ttyLocker ttyl;
4396 if (xtty != nullptr) xtty->head("statistics type='nmethod'");
4397 native_nmethod_stats.print_native_nmethod_stats();
4398 #ifdef COMPILER1
4399 c1_java_nmethod_stats.print_nmethod_stats("C1");
4400 #endif
4401 #ifdef COMPILER2
4402 c2_java_nmethod_stats.print_nmethod_stats("C2");
4403 #endif
4404 #if INCLUDE_JVMCI
4405 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI");
4406 #endif
4407 unknown_java_nmethod_stats.print_nmethod_stats("Unknown");
4408 DebugInformationRecorder::print_statistics();
4409 pc_nmethod_stats.print_pc_stats();
4410 Dependencies::print_statistics();
4411 ExternalsRecorder::print_statistics();
4412 if (xtty != nullptr) xtty->tail("statistics");
4413 }
4414
4415 #endif // !PRODUCT
4416
4417 #if INCLUDE_JVMCI
4418 void nmethod::update_speculation(JavaThread* thread) {
4419 jlong speculation = thread->pending_failed_speculation();
4420 if (speculation != 0) {
4421 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list");
4422 jvmci_nmethod_data()->add_failed_speculation(this, speculation);
4423 thread->set_pending_failed_speculation(0);
4424 }
4425 }
4426
4427 const char* nmethod::jvmci_name() {
4428 if (jvmci_nmethod_data() != nullptr) {
4429 return jvmci_nmethod_data()->name();
4430 }
4431 return nullptr;
4432 }
4433
4434 bool nmethod::jvmci_skip_profile_deopt() const {
4435 return jvmci_nmethod_data() != nullptr && !jvmci_nmethod_data()->profile_deopt();
4436 }
4437 #endif