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