1 /* 2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp" 26 #include "asm/assembler.inline.hpp" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/dependencies.hpp" 30 #include "code/nativeInst.hpp" 31 #include "code/nmethod.inline.hpp" 32 #include "code/scopeDesc.hpp" 33 #include "compiler/abstractCompiler.hpp" 34 #include "compiler/compilationLog.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/compileLog.hpp" 37 #include "compiler/compileTask.hpp" 38 #include "compiler/compilerDirectives.hpp" 39 #include "compiler/compilerOracle.hpp" 40 #include "compiler/directivesParser.hpp" 41 #include "compiler/disassembler.hpp" 42 #include "compiler/oopMap.inline.hpp" 43 #include "gc/shared/barrierSet.hpp" 44 #include "gc/shared/barrierSetNMethod.hpp" 45 #include "gc/shared/classUnloadingContext.hpp" 46 #include "gc/shared/collectedHeap.hpp" 47 #include "interpreter/bytecode.inline.hpp" 48 #include "jvm.h" 49 #include "logging/log.hpp" 50 #include "logging/logStream.hpp" 51 #include "memory/allocation.inline.hpp" 52 #include "memory/resourceArea.hpp" 53 #include "memory/universe.hpp" 54 #include "oops/access.inline.hpp" 55 #include "oops/klass.inline.hpp" 56 #include "oops/method.inline.hpp" 57 #include "oops/methodData.hpp" 58 #include "oops/oop.inline.hpp" 59 #include "oops/weakHandle.inline.hpp" 60 #include "prims/jvmtiImpl.hpp" 61 #include "prims/jvmtiThreadState.hpp" 62 #include "prims/methodHandles.hpp" 63 #include "runtime/continuation.hpp" 64 #include "runtime/atomic.hpp" 65 #include "runtime/deoptimization.hpp" 66 #include "runtime/flags/flagSetting.hpp" 67 #include "runtime/frame.inline.hpp" 68 #include "runtime/handles.inline.hpp" 69 #include "runtime/jniHandles.inline.hpp" 70 #include "runtime/orderAccess.hpp" 71 #include "runtime/os.hpp" 72 #include "runtime/safepointVerifiers.hpp" 73 #include "runtime/serviceThread.hpp" 74 #include "runtime/sharedRuntime.hpp" 75 #include "runtime/signature.hpp" 76 #include "runtime/threadWXSetters.inline.hpp" 77 #include "runtime/vmThread.hpp" 78 #include "utilities/align.hpp" 79 #include "utilities/copy.hpp" 80 #include "utilities/dtrace.hpp" 81 #include "utilities/events.hpp" 82 #include "utilities/globalDefinitions.hpp" 83 #include "utilities/resourceHash.hpp" 84 #include "utilities/xmlstream.hpp" 85 #if INCLUDE_JVMCI 86 #include "jvmci/jvmciRuntime.hpp" 87 #endif 88 89 #ifdef DTRACE_ENABLED 90 91 // Only bother with this argument setup if dtrace is available 92 93 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 94 { \ 95 Method* m = (method); \ 96 if (m != nullptr) { \ 97 Symbol* klass_name = m->klass_name(); \ 98 Symbol* name = m->name(); \ 99 Symbol* signature = m->signature(); \ 100 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 101 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 102 (char *) name->bytes(), name->utf8_length(), \ 103 (char *) signature->bytes(), signature->utf8_length()); \ 104 } \ 105 } 106 107 #else // ndef DTRACE_ENABLED 108 109 #define DTRACE_METHOD_UNLOAD_PROBE(method) 110 111 #endif 112 113 // Cast from int value to narrow type 114 #define CHECKED_CAST(result, T, thing) \ 115 result = static_cast<T>(thing); \ 116 assert(static_cast<int>(result) == thing, "failed: %d != %d", static_cast<int>(result), thing); 117 118 //--------------------------------------------------------------------------------- 119 // NMethod statistics 120 // They are printed under various flags, including: 121 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 122 // (In the latter two cases, they like other stats are printed to the log only.) 123 124 #ifndef PRODUCT 125 // These variables are put into one block to reduce relocations 126 // and make it simpler to print from the debugger. 127 struct java_nmethod_stats_struct { 128 uint nmethod_count; 129 uint total_nm_size; 130 uint total_immut_size; 131 uint 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 relocation_size += nm->relocation_size(); 152 consts_size += nm->consts_size(); 153 insts_size += nm->insts_size(); 154 stub_size += nm->stub_size(); 155 oops_size += nm->oops_size(); 156 metadata_size += nm->metadata_size(); 157 scopes_data_size += nm->scopes_data_size(); 158 scopes_pcs_size += nm->scopes_pcs_size(); 159 dependencies_size += nm->dependencies_size(); 160 handler_table_size += nm->handler_table_size(); 161 nul_chk_table_size += nm->nul_chk_table_size(); 162 #if INCLUDE_JVMCI 163 speculations_size += nm->speculations_size(); 164 jvmci_data_size += nm->jvmci_data_size(); 165 #endif 166 } 167 void print_nmethod_stats(const char* name) { 168 if (nmethod_count == 0) return; 169 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name); 170 uint total_size = total_nm_size + total_immut_size; 171 if (total_nm_size != 0) { 172 tty->print_cr(" total size = %u (100%%)", total_size); 173 tty->print_cr(" in CodeCache = %u (%f%%)", total_nm_size, (total_nm_size * 100.0f)/total_size); 174 } 175 uint header_size = (uint)(nmethod_count * sizeof(nmethod)); 176 if (nmethod_count != 0) { 177 tty->print_cr(" header = %u (%f%%)", header_size, (header_size * 100.0f)/total_nm_size); 178 } 179 if (relocation_size != 0) { 180 tty->print_cr(" relocation = %u (%f%%)", relocation_size, (relocation_size * 100.0f)/total_nm_size); 181 } 182 if (consts_size != 0) { 183 tty->print_cr(" constants = %u (%f%%)", consts_size, (consts_size * 100.0f)/total_nm_size); 184 } 185 if (insts_size != 0) { 186 tty->print_cr(" main code = %u (%f%%)", insts_size, (insts_size * 100.0f)/total_nm_size); 187 } 188 if (stub_size != 0) { 189 tty->print_cr(" stub code = %u (%f%%)", stub_size, (stub_size * 100.0f)/total_nm_size); 190 } 191 if (oops_size != 0) { 192 tty->print_cr(" oops = %u (%f%%)", oops_size, (oops_size * 100.0f)/total_nm_size); 193 } 194 if (metadata_size != 0) { 195 tty->print_cr(" metadata = %u (%f%%)", metadata_size, (metadata_size * 100.0f)/total_nm_size); 196 } 197 #if INCLUDE_JVMCI 198 if (jvmci_data_size != 0) { 199 tty->print_cr(" JVMCI data = %u (%f%%)", jvmci_data_size, (jvmci_data_size * 100.0f)/total_nm_size); 200 } 201 #endif 202 if (total_immut_size != 0) { 203 tty->print_cr(" immutable data = %u (%f%%)", total_immut_size, (total_immut_size * 100.0f)/total_size); 204 } 205 if (dependencies_size != 0) { 206 tty->print_cr(" dependencies = %u (%f%%)", dependencies_size, (dependencies_size * 100.0f)/total_immut_size); 207 } 208 if (nul_chk_table_size != 0) { 209 tty->print_cr(" nul chk table = %u (%f%%)", nul_chk_table_size, (nul_chk_table_size * 100.0f)/total_immut_size); 210 } 211 if (handler_table_size != 0) { 212 tty->print_cr(" handler table = %u (%f%%)", handler_table_size, (handler_table_size * 100.0f)/total_immut_size); 213 } 214 if (scopes_pcs_size != 0) { 215 tty->print_cr(" scopes pcs = %u (%f%%)", scopes_pcs_size, (scopes_pcs_size * 100.0f)/total_immut_size); 216 } 217 if (scopes_data_size != 0) { 218 tty->print_cr(" scopes data = %u (%f%%)", scopes_data_size, (scopes_data_size * 100.0f)/total_immut_size); 219 } 220 #if INCLUDE_JVMCI 221 if (speculations_size != 0) { 222 tty->print_cr(" speculations = %u (%f%%)", speculations_size, (speculations_size * 100.0f)/total_immut_size); 223 } 224 #endif 225 } 226 }; 227 228 struct native_nmethod_stats_struct { 229 uint native_nmethod_count; 230 uint native_total_size; 231 uint native_relocation_size; 232 uint native_insts_size; 233 uint native_oops_size; 234 uint native_metadata_size; 235 void note_native_nmethod(nmethod* nm) { 236 native_nmethod_count += 1; 237 native_total_size += nm->size(); 238 native_relocation_size += nm->relocation_size(); 239 native_insts_size += nm->insts_size(); 240 native_oops_size += nm->oops_size(); 241 native_metadata_size += nm->metadata_size(); 242 } 243 void print_native_nmethod_stats() { 244 if (native_nmethod_count == 0) return; 245 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count); 246 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size); 247 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size); 248 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size); 249 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size); 250 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size); 251 } 252 }; 253 254 struct pc_nmethod_stats_struct { 255 uint pc_desc_init; // number of initialization of cache (= number of caches) 256 uint pc_desc_queries; // queries to nmethod::find_pc_desc 257 uint pc_desc_approx; // number of those which have approximate true 258 uint pc_desc_repeats; // number of _pc_descs[0] hits 259 uint pc_desc_hits; // number of LRU cache hits 260 uint pc_desc_tests; // total number of PcDesc examinations 261 uint pc_desc_searches; // total number of quasi-binary search steps 262 uint pc_desc_adds; // number of LUR cache insertions 263 264 void print_pc_stats() { 265 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query", 266 pc_desc_queries, 267 (double)(pc_desc_tests + pc_desc_searches) 268 / pc_desc_queries); 269 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u", 270 pc_desc_init, 271 pc_desc_queries, pc_desc_approx, 272 pc_desc_repeats, pc_desc_hits, 273 pc_desc_tests, pc_desc_searches, pc_desc_adds); 274 } 275 }; 276 277 #ifdef COMPILER1 278 static java_nmethod_stats_struct c1_java_nmethod_stats; 279 #endif 280 #ifdef COMPILER2 281 static java_nmethod_stats_struct c2_java_nmethod_stats; 282 #endif 283 #if INCLUDE_JVMCI 284 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 285 #endif 286 static java_nmethod_stats_struct unknown_java_nmethod_stats; 287 288 static native_nmethod_stats_struct native_nmethod_stats; 289 static pc_nmethod_stats_struct pc_nmethod_stats; 290 291 static void note_java_nmethod(nmethod* nm) { 292 #ifdef COMPILER1 293 if (nm->is_compiled_by_c1()) { 294 c1_java_nmethod_stats.note_nmethod(nm); 295 } else 296 #endif 297 #ifdef COMPILER2 298 if (nm->is_compiled_by_c2()) { 299 c2_java_nmethod_stats.note_nmethod(nm); 300 } else 301 #endif 302 #if INCLUDE_JVMCI 303 if (nm->is_compiled_by_jvmci()) { 304 jvmci_java_nmethod_stats.note_nmethod(nm); 305 } else 306 #endif 307 { 308 unknown_java_nmethod_stats.note_nmethod(nm); 309 } 310 } 311 #endif // !PRODUCT 312 313 //--------------------------------------------------------------------------------- 314 315 316 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 317 assert(pc != nullptr, "Must be non null"); 318 assert(exception.not_null(), "Must be non null"); 319 assert(handler != nullptr, "Must be non null"); 320 321 _count = 0; 322 _exception_type = exception->klass(); 323 _next = nullptr; 324 _purge_list_next = nullptr; 325 326 add_address_and_handler(pc,handler); 327 } 328 329 330 address ExceptionCache::match(Handle exception, address pc) { 331 assert(pc != nullptr,"Must be non null"); 332 assert(exception.not_null(),"Must be non null"); 333 if (exception->klass() == exception_type()) { 334 return (test_address(pc)); 335 } 336 337 return nullptr; 338 } 339 340 341 bool ExceptionCache::match_exception_with_space(Handle exception) { 342 assert(exception.not_null(),"Must be non null"); 343 if (exception->klass() == exception_type() && count() < cache_size) { 344 return true; 345 } 346 return false; 347 } 348 349 350 address ExceptionCache::test_address(address addr) { 351 int limit = count(); 352 for (int i = 0; i < limit; i++) { 353 if (pc_at(i) == addr) { 354 return handler_at(i); 355 } 356 } 357 return nullptr; 358 } 359 360 361 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 362 if (test_address(addr) == handler) return true; 363 364 int index = count(); 365 if (index < cache_size) { 366 set_pc_at(index, addr); 367 set_handler_at(index, handler); 368 increment_count(); 369 return true; 370 } 371 return false; 372 } 373 374 ExceptionCache* ExceptionCache::next() { 375 return Atomic::load(&_next); 376 } 377 378 void ExceptionCache::set_next(ExceptionCache *ec) { 379 Atomic::store(&_next, ec); 380 } 381 382 //----------------------------------------------------------------------------- 383 384 385 // Helper used by both find_pc_desc methods. 386 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 387 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 388 if (!approximate) { 389 return pc->pc_offset() == pc_offset; 390 } else { 391 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 392 } 393 } 394 395 void PcDescCache::init_to(PcDesc* initial_pc_desc) { 396 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_init); 397 // initialize the cache by filling it with benign (non-null) values 398 assert(initial_pc_desc != nullptr && initial_pc_desc->pc_offset() == PcDesc::lower_offset_limit, 399 "must start with a sentinel"); 400 for (int i = 0; i < cache_size; i++) { 401 _pc_descs[i] = initial_pc_desc; 402 } 403 } 404 405 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 406 // Note: one might think that caching the most recently 407 // read value separately would be a win, but one would be 408 // wrong. When many threads are updating it, the cache 409 // line it's in would bounce between caches, negating 410 // any benefit. 411 412 // In order to prevent race conditions do not load cache elements 413 // repeatedly, but use a local copy: 414 PcDesc* res; 415 416 // Step one: Check the most recently added value. 417 res = _pc_descs[0]; 418 assert(res != nullptr, "PcDesc cache should be initialized already"); 419 420 // Approximate only here since PcDescContainer::find_pc_desc() checked for exact case. 421 if (approximate && match_desc(res, pc_offset, approximate)) { 422 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 423 return res; 424 } 425 426 // Step two: Check the rest of the LRU cache. 427 for (int i = 1; i < cache_size; ++i) { 428 res = _pc_descs[i]; 429 if (res->pc_offset() < 0) break; // optimization: skip empty cache 430 if (match_desc(res, pc_offset, approximate)) { 431 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 432 return res; 433 } 434 } 435 436 // Report failure. 437 return nullptr; 438 } 439 440 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 441 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 442 // Update the LRU cache by shifting pc_desc forward. 443 for (int i = 0; i < cache_size; i++) { 444 PcDesc* next = _pc_descs[i]; 445 _pc_descs[i] = pc_desc; 446 pc_desc = next; 447 } 448 } 449 450 // adjust pcs_size so that it is a multiple of both oopSize and 451 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 452 // of oopSize, then 2*sizeof(PcDesc) is) 453 static int adjust_pcs_size(int pcs_size) { 454 int nsize = align_up(pcs_size, oopSize); 455 if ((nsize % sizeof(PcDesc)) != 0) { 456 nsize = pcs_size + sizeof(PcDesc); 457 } 458 assert((nsize % oopSize) == 0, "correct alignment"); 459 return nsize; 460 } 461 462 bool nmethod::is_method_handle_return(address return_pc) { 463 if (!has_method_handle_invokes()) return false; 464 PcDesc* pd = pc_desc_at(return_pc); 465 if (pd == nullptr) 466 return false; 467 return pd->is_method_handle_invoke(); 468 } 469 470 // Returns a string version of the method state. 471 const char* nmethod::state() const { 472 int state = get_state(); 473 switch (state) { 474 case not_installed: 475 return "not installed"; 476 case in_use: 477 return "in use"; 478 case not_entrant: 479 return "not_entrant"; 480 default: 481 fatal("unexpected method state: %d", state); 482 return nullptr; 483 } 484 } 485 486 void nmethod::set_deoptimized_done() { 487 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 488 if (_deoptimization_status != deoptimize_done) { // can't go backwards 489 Atomic::store(&_deoptimization_status, deoptimize_done); 490 } 491 } 492 493 ExceptionCache* nmethod::exception_cache_acquire() const { 494 return Atomic::load_acquire(&_exception_cache); 495 } 496 497 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 498 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 499 assert(new_entry != nullptr,"Must be non null"); 500 assert(new_entry->next() == nullptr, "Must be null"); 501 502 for (;;) { 503 ExceptionCache *ec = exception_cache(); 504 if (ec != nullptr) { 505 Klass* ex_klass = ec->exception_type(); 506 if (!ex_klass->is_loader_alive()) { 507 // We must guarantee that entries are not inserted with new next pointer 508 // edges to ExceptionCache entries with dead klasses, due to bad interactions 509 // with concurrent ExceptionCache cleanup. Therefore, the inserts roll 510 // the head pointer forward to the first live ExceptionCache, so that the new 511 // next pointers always point at live ExceptionCaches, that are not removed due 512 // to concurrent ExceptionCache cleanup. 513 ExceptionCache* next = ec->next(); 514 if (Atomic::cmpxchg(&_exception_cache, ec, next) == ec) { 515 CodeCache::release_exception_cache(ec); 516 } 517 continue; 518 } 519 ec = exception_cache(); 520 if (ec != nullptr) { 521 new_entry->set_next(ec); 522 } 523 } 524 if (Atomic::cmpxchg(&_exception_cache, ec, new_entry) == ec) { 525 return; 526 } 527 } 528 } 529 530 void nmethod::clean_exception_cache() { 531 // For each nmethod, only a single thread may call this cleanup function 532 // at the same time, whether called in STW cleanup or concurrent cleanup. 533 // Note that if the GC is processing exception cache cleaning in a concurrent phase, 534 // then a single writer may contend with cleaning up the head pointer to the 535 // first ExceptionCache node that has a Klass* that is alive. That is fine, 536 // as long as there is no concurrent cleanup of next pointers from concurrent writers. 537 // And the concurrent writers do not clean up next pointers, only the head. 538 // Also note that concurrent readers will walk through Klass* pointers that are not 539 // alive. That does not cause ABA problems, because Klass* is deleted after 540 // a handshake with all threads, after all stale ExceptionCaches have been 541 // unlinked. That is also when the CodeCache::exception_cache_purge_list() 542 // is deleted, with all ExceptionCache entries that were cleaned concurrently. 543 // That similarly implies that CAS operations on ExceptionCache entries do not 544 // suffer from ABA problems as unlinking and deletion is separated by a global 545 // handshake operation. 546 ExceptionCache* prev = nullptr; 547 ExceptionCache* curr = exception_cache_acquire(); 548 549 while (curr != nullptr) { 550 ExceptionCache* next = curr->next(); 551 552 if (!curr->exception_type()->is_loader_alive()) { 553 if (prev == nullptr) { 554 // Try to clean head; this is contended by concurrent inserts, that 555 // both lazily clean the head, and insert entries at the head. If 556 // the CAS fails, the operation is restarted. 557 if (Atomic::cmpxchg(&_exception_cache, curr, next) != curr) { 558 prev = nullptr; 559 curr = exception_cache_acquire(); 560 continue; 561 } 562 } else { 563 // It is impossible to during cleanup connect the next pointer to 564 // an ExceptionCache that has not been published before a safepoint 565 // prior to the cleanup. Therefore, release is not required. 566 prev->set_next(next); 567 } 568 // prev stays the same. 569 570 CodeCache::release_exception_cache(curr); 571 } else { 572 prev = curr; 573 } 574 575 curr = next; 576 } 577 } 578 579 // public method for accessing the exception cache 580 // These are the public access methods. 581 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 582 // We never grab a lock to read the exception cache, so we may 583 // have false negatives. This is okay, as it can only happen during 584 // the first few exception lookups for a given nmethod. 585 ExceptionCache* ec = exception_cache_acquire(); 586 while (ec != nullptr) { 587 address ret_val; 588 if ((ret_val = ec->match(exception,pc)) != nullptr) { 589 return ret_val; 590 } 591 ec = ec->next(); 592 } 593 return nullptr; 594 } 595 596 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 597 // There are potential race conditions during exception cache updates, so we 598 // must own the ExceptionCache_lock before doing ANY modifications. Because 599 // we don't lock during reads, it is possible to have several threads attempt 600 // to update the cache with the same data. We need to check for already inserted 601 // copies of the current data before adding it. 602 603 MutexLocker ml(ExceptionCache_lock); 604 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 605 606 if (target_entry == nullptr || !target_entry->add_address_and_handler(pc,handler)) { 607 target_entry = new ExceptionCache(exception,pc,handler); 608 add_exception_cache_entry(target_entry); 609 } 610 } 611 612 // private method for handling exception cache 613 // These methods are private, and used to manipulate the exception cache 614 // directly. 615 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 616 ExceptionCache* ec = exception_cache_acquire(); 617 while (ec != nullptr) { 618 if (ec->match_exception_with_space(exception)) { 619 return ec; 620 } 621 ec = ec->next(); 622 } 623 return nullptr; 624 } 625 626 bool nmethod::is_at_poll_return(address pc) { 627 RelocIterator iter(this, pc, pc+1); 628 while (iter.next()) { 629 if (iter.type() == relocInfo::poll_return_type) 630 return true; 631 } 632 return false; 633 } 634 635 636 bool nmethod::is_at_poll_or_poll_return(address pc) { 637 RelocIterator iter(this, pc, pc+1); 638 while (iter.next()) { 639 relocInfo::relocType t = iter.type(); 640 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 641 return true; 642 } 643 return false; 644 } 645 646 void nmethod::verify_oop_relocations() { 647 // Ensure sure that the code matches the current oop values 648 RelocIterator iter(this, nullptr, nullptr); 649 while (iter.next()) { 650 if (iter.type() == relocInfo::oop_type) { 651 oop_Relocation* reloc = iter.oop_reloc(); 652 if (!reloc->oop_is_immediate()) { 653 reloc->verify_oop_relocation(); 654 } 655 } 656 } 657 } 658 659 660 ScopeDesc* nmethod::scope_desc_at(address pc) { 661 PcDesc* pd = pc_desc_at(pc); 662 guarantee(pd != nullptr, "scope must be present"); 663 return new ScopeDesc(this, pd); 664 } 665 666 ScopeDesc* nmethod::scope_desc_near(address pc) { 667 PcDesc* pd = pc_desc_near(pc); 668 guarantee(pd != nullptr, "scope must be present"); 669 return new ScopeDesc(this, pd); 670 } 671 672 address nmethod::oops_reloc_begin() const { 673 // If the method is not entrant then a JMP is plastered over the 674 // first few bytes. If an oop in the old code was there, that oop 675 // should not get GC'd. Skip the first few bytes of oops on 676 // not-entrant methods. 677 if (frame_complete_offset() != CodeOffsets::frame_never_safe && 678 code_begin() + frame_complete_offset() > 679 verified_entry_point() + NativeJump::instruction_size) 680 { 681 // If we have a frame_complete_offset after the native jump, then there 682 // is no point trying to look for oops before that. This is a requirement 683 // for being allowed to scan oops concurrently. 684 return code_begin() + frame_complete_offset(); 685 } 686 687 // It is not safe to read oops concurrently using entry barriers, if their 688 // location depend on whether the nmethod is entrant or not. 689 // assert(BarrierSet::barrier_set()->barrier_set_nmethod() == nullptr, "Not safe oop scan"); 690 691 address low_boundary = verified_entry_point(); 692 if (!is_in_use()) { 693 low_boundary += NativeJump::instruction_size; 694 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 695 // This means that the low_boundary is going to be a little too high. 696 // This shouldn't matter, since oops of non-entrant methods are never used. 697 // In fact, why are we bothering to look at oops in a non-entrant method?? 698 } 699 return low_boundary; 700 } 701 702 // Method that knows how to preserve outgoing arguments at call. This method must be 703 // called with a frame corresponding to a Java invoke 704 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 705 if (method() == nullptr) { 706 return; 707 } 708 709 // handle the case of an anchor explicitly set in continuation code that doesn't have a callee 710 JavaThread* thread = reg_map->thread(); 711 if ((thread->has_last_Java_frame() && fr.sp() == thread->last_Java_sp()) 712 JVMTI_ONLY(|| (method()->is_continuation_enter_intrinsic() && thread->on_monitor_waited_event()))) { 713 return; 714 } 715 716 if (!method()->is_native()) { 717 address pc = fr.pc(); 718 bool has_receiver, has_appendix; 719 Symbol* signature; 720 721 // The method attached by JIT-compilers should be used, if present. 722 // Bytecode can be inaccurate in such case. 723 Method* callee = attached_method_before_pc(pc); 724 if (callee != nullptr) { 725 has_receiver = !(callee->access_flags().is_static()); 726 has_appendix = false; 727 signature = callee->signature(); 728 729 // If inline types are passed as fields, use the extended signature 730 // which contains the types of all (oop) fields of the inline type. 731 if (is_compiled_by_c2() && callee->has_scalarized_args()) { 732 const GrowableArray<SigEntry>* sig = callee->adapter()->get_sig_cc(); 733 assert(sig != nullptr, "sig should never be null"); 734 TempNewSymbol tmp_sig = SigEntry::create_symbol(sig); 735 has_receiver = false; // The extended signature contains the receiver type 736 fr.oops_compiled_arguments_do(tmp_sig, has_receiver, has_appendix, reg_map, f); 737 return; 738 } 739 } else { 740 SimpleScopeDesc ssd(this, pc); 741 742 Bytecode_invoke call(methodHandle(Thread::current(), ssd.method()), ssd.bci()); 743 has_receiver = call.has_receiver(); 744 has_appendix = call.has_appendix(); 745 signature = call.signature(); 746 } 747 748 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 749 } else if (method()->is_continuation_enter_intrinsic()) { 750 // This method only calls Continuation.enter() 751 Symbol* signature = vmSymbols::continuationEnter_signature(); 752 fr.oops_compiled_arguments_do(signature, false, false, reg_map, f); 753 } 754 } 755 756 Method* nmethod::attached_method(address call_instr) { 757 assert(code_contains(call_instr), "not part of the nmethod"); 758 RelocIterator iter(this, call_instr, call_instr + 1); 759 while (iter.next()) { 760 if (iter.addr() == call_instr) { 761 switch(iter.type()) { 762 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value(); 763 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value(); 764 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value(); 765 default: break; 766 } 767 } 768 } 769 return nullptr; // not found 770 } 771 772 Method* nmethod::attached_method_before_pc(address pc) { 773 if (NativeCall::is_call_before(pc)) { 774 NativeCall* ncall = nativeCall_before(pc); 775 return attached_method(ncall->instruction_address()); 776 } 777 return nullptr; // not a call 778 } 779 780 void nmethod::clear_inline_caches() { 781 assert(SafepointSynchronize::is_at_safepoint(), "clearing of IC's only allowed at safepoint"); 782 RelocIterator iter(this); 783 while (iter.next()) { 784 iter.reloc()->clear_inline_cache(); 785 } 786 } 787 788 #ifdef ASSERT 789 // Check class_loader is alive for this bit of metadata. 790 class CheckClass : public MetadataClosure { 791 void do_metadata(Metadata* md) { 792 Klass* klass = nullptr; 793 if (md->is_klass()) { 794 klass = ((Klass*)md); 795 } else if (md->is_method()) { 796 klass = ((Method*)md)->method_holder(); 797 } else if (md->is_methodData()) { 798 klass = ((MethodData*)md)->method()->method_holder(); 799 } else { 800 md->print(); 801 ShouldNotReachHere(); 802 } 803 assert(klass->is_loader_alive(), "must be alive"); 804 } 805 }; 806 #endif // ASSERT 807 808 809 static void clean_ic_if_metadata_is_dead(CompiledIC *ic) { 810 ic->clean_metadata(); 811 } 812 813 // Clean references to unloaded nmethods at addr from this one, which is not unloaded. 814 template <typename CallsiteT> 815 static void clean_if_nmethod_is_unloaded(CallsiteT* callsite, nmethod* from, 816 bool clean_all) { 817 CodeBlob* cb = CodeCache::find_blob(callsite->destination()); 818 if (!cb->is_nmethod()) { 819 return; 820 } 821 nmethod* nm = cb->as_nmethod(); 822 if (clean_all || !nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) { 823 callsite->set_to_clean(); 824 } 825 } 826 827 // Cleans caches in nmethods that point to either classes that are unloaded 828 // or nmethods that are unloaded. 829 // 830 // Can be called either in parallel by G1 currently or after all 831 // nmethods are unloaded. Return postponed=true in the parallel case for 832 // inline caches found that point to nmethods that are not yet visited during 833 // the do_unloading walk. 834 void nmethod::unload_nmethod_caches(bool unloading_occurred) { 835 ResourceMark rm; 836 837 // Exception cache only needs to be called if unloading occurred 838 if (unloading_occurred) { 839 clean_exception_cache(); 840 } 841 842 cleanup_inline_caches_impl(unloading_occurred, false); 843 844 #ifdef ASSERT 845 // Check that the metadata embedded in the nmethod is alive 846 CheckClass check_class; 847 metadata_do(&check_class); 848 #endif 849 } 850 851 void nmethod::run_nmethod_entry_barrier() { 852 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 853 if (bs_nm != nullptr) { 854 // We want to keep an invariant that nmethods found through iterations of a Thread's 855 // nmethods found in safepoints have gone through an entry barrier and are not armed. 856 // By calling this nmethod entry barrier, it plays along and acts 857 // like any other nmethod found on the stack of a thread (fewer surprises). 858 nmethod* nm = this; 859 bool alive = bs_nm->nmethod_entry_barrier(nm); 860 assert(alive, "should be alive"); 861 } 862 } 863 864 // Only called by whitebox test 865 void nmethod::cleanup_inline_caches_whitebox() { 866 assert_locked_or_safepoint(CodeCache_lock); 867 CompiledICLocker ic_locker(this); 868 cleanup_inline_caches_impl(false /* unloading_occurred */, true /* clean_all */); 869 } 870 871 address* nmethod::orig_pc_addr(const frame* fr) { 872 return (address*) ((address)fr->unextended_sp() + orig_pc_offset()); 873 } 874 875 // Called to clean up after class unloading for live nmethods 876 void nmethod::cleanup_inline_caches_impl(bool unloading_occurred, bool clean_all) { 877 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 878 ResourceMark rm; 879 880 // Find all calls in an nmethod and clear the ones that point to bad nmethods. 881 RelocIterator iter(this, oops_reloc_begin()); 882 bool is_in_static_stub = false; 883 while(iter.next()) { 884 885 switch (iter.type()) { 886 887 case relocInfo::virtual_call_type: 888 if (unloading_occurred) { 889 // If class unloading occurred we first clear ICs where the cached metadata 890 // is referring to an unloaded klass or method. 891 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter)); 892 } 893 894 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), this, clean_all); 895 break; 896 897 case relocInfo::opt_virtual_call_type: 898 case relocInfo::static_call_type: 899 clean_if_nmethod_is_unloaded(CompiledDirectCall::at(iter.reloc()), this, clean_all); 900 break; 901 902 case relocInfo::static_stub_type: { 903 is_in_static_stub = true; 904 break; 905 } 906 907 case relocInfo::metadata_type: { 908 // Only the metadata relocations contained in static/opt virtual call stubs 909 // contains the Method* passed to c2i adapters. It is the only metadata 910 // relocation that needs to be walked, as it is the one metadata relocation 911 // that violates the invariant that all metadata relocations have an oop 912 // in the compiled method (due to deferred resolution and code patching). 913 914 // This causes dead metadata to remain in compiled methods that are not 915 // unloading. Unless these slippery metadata relocations of the static 916 // stubs are at least cleared, subsequent class redefinition operations 917 // will access potentially free memory, and JavaThread execution 918 // concurrent to class unloading may call c2i adapters with dead methods. 919 if (!is_in_static_stub) { 920 // The first metadata relocation after a static stub relocation is the 921 // metadata relocation of the static stub used to pass the Method* to 922 // c2i adapters. 923 continue; 924 } 925 is_in_static_stub = false; 926 if (is_unloading()) { 927 // If the nmethod itself is dying, then it may point at dead metadata. 928 // Nobody should follow that metadata; it is strictly unsafe. 929 continue; 930 } 931 metadata_Relocation* r = iter.metadata_reloc(); 932 Metadata* md = r->metadata_value(); 933 if (md != nullptr && md->is_method()) { 934 Method* method = static_cast<Method*>(md); 935 if (!method->method_holder()->is_loader_alive()) { 936 Atomic::store(r->metadata_addr(), (Method*)nullptr); 937 938 if (!r->metadata_is_immediate()) { 939 r->fix_metadata_relocation(); 940 } 941 } 942 } 943 break; 944 } 945 946 default: 947 break; 948 } 949 } 950 } 951 952 address nmethod::continuation_for_implicit_exception(address pc, bool for_div0_check) { 953 // Exception happened outside inline-cache check code => we are inside 954 // an active nmethod => use cpc to determine a return address 955 int exception_offset = int(pc - code_begin()); 956 int cont_offset = ImplicitExceptionTable(this).continuation_offset( exception_offset ); 957 #ifdef ASSERT 958 if (cont_offset == 0) { 959 Thread* thread = Thread::current(); 960 ResourceMark rm(thread); 961 CodeBlob* cb = CodeCache::find_blob(pc); 962 assert(cb != nullptr && cb == this, ""); 963 964 // Keep tty output consistent. To avoid ttyLocker, we buffer in stream, and print all at once. 965 stringStream ss; 966 ss.print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 967 print_on(&ss); 968 method()->print_codes_on(&ss); 969 print_code_on(&ss); 970 print_pcs_on(&ss); 971 tty->print("%s", ss.as_string()); // print all at once 972 } 973 #endif 974 if (cont_offset == 0) { 975 // Let the normal error handling report the exception 976 return nullptr; 977 } 978 if (cont_offset == exception_offset) { 979 #if INCLUDE_JVMCI 980 Deoptimization::DeoptReason deopt_reason = for_div0_check ? Deoptimization::Reason_div0_check : Deoptimization::Reason_null_check; 981 JavaThread *thread = JavaThread::current(); 982 thread->set_jvmci_implicit_exception_pc(pc); 983 thread->set_pending_deoptimization(Deoptimization::make_trap_request(deopt_reason, 984 Deoptimization::Action_reinterpret)); 985 return (SharedRuntime::deopt_blob()->implicit_exception_uncommon_trap()); 986 #else 987 ShouldNotReachHere(); 988 #endif 989 } 990 return code_begin() + cont_offset; 991 } 992 993 class HasEvolDependency : public MetadataClosure { 994 bool _has_evol_dependency; 995 public: 996 HasEvolDependency() : _has_evol_dependency(false) {} 997 void do_metadata(Metadata* md) { 998 if (md->is_method()) { 999 Method* method = (Method*)md; 1000 if (method->is_old()) { 1001 _has_evol_dependency = true; 1002 } 1003 } 1004 } 1005 bool has_evol_dependency() const { return _has_evol_dependency; } 1006 }; 1007 1008 bool nmethod::has_evol_metadata() { 1009 // Check the metadata in relocIter and CompiledIC and also deoptimize 1010 // any nmethod that has reference to old methods. 1011 HasEvolDependency check_evol; 1012 metadata_do(&check_evol); 1013 if (check_evol.has_evol_dependency() && log_is_enabled(Debug, redefine, class, nmethod)) { 1014 ResourceMark rm; 1015 log_debug(redefine, class, nmethod) 1016 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on in nmethod metadata", 1017 _method->method_holder()->external_name(), 1018 _method->name()->as_C_string(), 1019 _method->signature()->as_C_string(), 1020 compile_id()); 1021 } 1022 return check_evol.has_evol_dependency(); 1023 } 1024 1025 int nmethod::total_size() const { 1026 return 1027 consts_size() + 1028 insts_size() + 1029 stub_size() + 1030 scopes_data_size() + 1031 scopes_pcs_size() + 1032 handler_table_size() + 1033 nul_chk_table_size(); 1034 } 1035 1036 const char* nmethod::compile_kind() const { 1037 if (is_osr_method()) return "osr"; 1038 if (method() != nullptr && is_native_method()) { 1039 if (method()->is_continuation_native_intrinsic()) { 1040 return "cnt"; 1041 } 1042 return "c2n"; 1043 } 1044 return nullptr; 1045 } 1046 1047 const char* nmethod::compiler_name() const { 1048 return compilertype2name(_compiler_type); 1049 } 1050 1051 #ifdef ASSERT 1052 class CheckForOopsClosure : public OopClosure { 1053 bool _found_oop = false; 1054 public: 1055 virtual void do_oop(oop* o) { _found_oop = true; } 1056 virtual void do_oop(narrowOop* o) { _found_oop = true; } 1057 bool found_oop() { return _found_oop; } 1058 }; 1059 class CheckForMetadataClosure : public MetadataClosure { 1060 bool _found_metadata = false; 1061 Metadata* _ignore = nullptr; 1062 public: 1063 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {} 1064 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; } 1065 bool found_metadata() { return _found_metadata; } 1066 }; 1067 1068 static void assert_no_oops_or_metadata(nmethod* nm) { 1069 if (nm == nullptr) return; 1070 assert(nm->oop_maps() == nullptr, "expectation"); 1071 1072 CheckForOopsClosure cfo; 1073 nm->oops_do(&cfo); 1074 assert(!cfo.found_oop(), "no oops allowed"); 1075 1076 // We allow an exception for the own Method, but require its class to be permanent. 1077 Method* own_method = nm->method(); 1078 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method); 1079 nm->metadata_do(&cfm); 1080 assert(!cfm.found_metadata(), "no metadata allowed"); 1081 1082 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(), 1083 "Method's class needs to be permanent"); 1084 } 1085 #endif 1086 1087 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 1088 int compile_id, 1089 CodeBuffer *code_buffer, 1090 int vep_offset, 1091 int frame_complete, 1092 int frame_size, 1093 ByteSize basic_lock_owner_sp_offset, 1094 ByteSize basic_lock_sp_offset, 1095 OopMapSet* oop_maps, 1096 int exception_handler) { 1097 code_buffer->finalize_oop_references(method); 1098 // create nmethod 1099 nmethod* nm = nullptr; 1100 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 1101 { 1102 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1103 1104 CodeOffsets offsets; 1105 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 1106 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 1107 if (exception_handler != -1) { 1108 offsets.set_value(CodeOffsets::Exceptions, exception_handler); 1109 } 1110 1111 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space. 1112 // IsUnloadingBehaviour::is_unloading needs to handle them separately. 1113 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space(); 1114 nm = new (native_nmethod_size, allow_NonNMethod_space) 1115 nmethod(method(), compiler_none, native_nmethod_size, 1116 compile_id, &offsets, 1117 code_buffer, frame_size, 1118 basic_lock_owner_sp_offset, 1119 basic_lock_sp_offset, 1120 oop_maps); 1121 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); ) 1122 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm)); 1123 } 1124 1125 if (nm != nullptr) { 1126 // verify nmethod 1127 debug_only(nm->verify();) // might block 1128 1129 nm->log_new_nmethod(); 1130 } 1131 return nm; 1132 } 1133 1134 nmethod* nmethod::new_nmethod(const methodHandle& method, 1135 int compile_id, 1136 int entry_bci, 1137 CodeOffsets* offsets, 1138 int orig_pc_offset, 1139 DebugInformationRecorder* debug_info, 1140 Dependencies* dependencies, 1141 CodeBuffer* code_buffer, int frame_size, 1142 OopMapSet* oop_maps, 1143 ExceptionHandlerTable* handler_table, 1144 ImplicitExceptionTable* nul_chk_table, 1145 AbstractCompiler* compiler, 1146 CompLevel comp_level 1147 #if INCLUDE_JVMCI 1148 , char* speculations, 1149 int speculations_len, 1150 JVMCINMethodData* jvmci_data 1151 #endif 1152 ) 1153 { 1154 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 1155 code_buffer->finalize_oop_references(method); 1156 // create nmethod 1157 nmethod* nm = nullptr; 1158 int nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 1159 #if INCLUDE_JVMCI 1160 if (compiler->is_jvmci()) { 1161 nmethod_size += align_up(jvmci_data->size(), oopSize); 1162 } 1163 #endif 1164 1165 int immutable_data_size = 1166 adjust_pcs_size(debug_info->pcs_size()) 1167 + align_up((int)dependencies->size_in_bytes(), oopSize) 1168 + align_up(handler_table->size_in_bytes() , oopSize) 1169 + align_up(nul_chk_table->size_in_bytes() , oopSize) 1170 #if INCLUDE_JVMCI 1171 + align_up(speculations_len , oopSize) 1172 #endif 1173 + align_up(debug_info->data_size() , oopSize); 1174 1175 // First, allocate space for immutable data in C heap. 1176 address immutable_data = nullptr; 1177 if (immutable_data_size > 0) { 1178 immutable_data = (address)os::malloc(immutable_data_size, mtCode); 1179 if (immutable_data == nullptr) { 1180 vm_exit_out_of_memory(immutable_data_size, OOM_MALLOC_ERROR, "nmethod: no space for immutable data"); 1181 return nullptr; 1182 } 1183 } 1184 { 1185 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1186 1187 nm = new (nmethod_size, comp_level) 1188 nmethod(method(), compiler->type(), nmethod_size, immutable_data_size, 1189 compile_id, entry_bci, immutable_data, offsets, orig_pc_offset, 1190 debug_info, dependencies, code_buffer, frame_size, oop_maps, 1191 handler_table, nul_chk_table, compiler, comp_level 1192 #if INCLUDE_JVMCI 1193 , speculations, 1194 speculations_len, 1195 jvmci_data 1196 #endif 1197 ); 1198 1199 if (nm != nullptr) { 1200 // To make dependency checking during class loading fast, record 1201 // the nmethod dependencies in the classes it is dependent on. 1202 // This allows the dependency checking code to simply walk the 1203 // class hierarchy above the loaded class, checking only nmethods 1204 // which are dependent on those classes. The slow way is to 1205 // check every nmethod for dependencies which makes it linear in 1206 // the number of methods compiled. For applications with a lot 1207 // classes the slow way is too slow. 1208 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1209 if (deps.type() == Dependencies::call_site_target_value) { 1210 // CallSite dependencies are managed on per-CallSite instance basis. 1211 oop call_site = deps.argument_oop(0); 1212 MethodHandles::add_dependent_nmethod(call_site, nm); 1213 } else { 1214 InstanceKlass* ik = deps.context_type(); 1215 if (ik == nullptr) { 1216 continue; // ignore things like evol_method 1217 } 1218 // record this nmethod as dependent on this klass 1219 ik->add_dependent_nmethod(nm); 1220 } 1221 } 1222 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm)); 1223 } 1224 } 1225 // Do verification and logging outside CodeCache_lock. 1226 if (nm != nullptr) { 1227 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 1228 DEBUG_ONLY(nm->verify();) 1229 nm->log_new_nmethod(); 1230 } 1231 return nm; 1232 } 1233 1234 // Fill in default values for various fields 1235 void nmethod::init_defaults(CodeBuffer *code_buffer, CodeOffsets* offsets) { 1236 // avoid uninitialized fields, even for short time periods 1237 _exception_cache = nullptr; 1238 _gc_data = nullptr; 1239 _oops_do_mark_link = nullptr; 1240 _compiled_ic_data = nullptr; 1241 1242 _is_unloading_state = 0; 1243 _state = not_installed; 1244 1245 _has_unsafe_access = 0; 1246 _has_method_handle_invokes = 0; 1247 _has_wide_vectors = 0; 1248 _has_monitors = 0; 1249 _has_scoped_access = 0; 1250 _has_flushed_dependencies = 0; 1251 _is_unlinked = 0; 1252 _load_reported = 0; // jvmti state 1253 1254 _deoptimization_status = not_marked; 1255 1256 // SECT_CONSTS is first in code buffer so the offset should be 0. 1257 int consts_offset = code_buffer->total_offset_of(code_buffer->consts()); 1258 assert(consts_offset == 0, "const_offset: %d", consts_offset); 1259 1260 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 1261 1262 CHECKED_CAST(_entry_offset, uint16_t, (offsets->value(CodeOffsets::Entry))); 1263 CHECKED_CAST(_verified_entry_offset, uint16_t, (offsets->value(CodeOffsets::Verified_Entry))); 1264 1265 _inline_entry_point = entry_point(); 1266 _verified_inline_entry_point = verified_entry_point(); 1267 _verified_inline_ro_entry_point = verified_entry_point(); 1268 1269 _skipped_instructions_size = code_buffer->total_skipped_instructions_size(); 1270 } 1271 1272 // Post initialization 1273 void nmethod::post_init() { 1274 clear_unloading_state(); 1275 1276 finalize_relocations(); 1277 1278 Universe::heap()->register_nmethod(this); 1279 debug_only(Universe::heap()->verify_nmethod(this)); 1280 1281 CodeCache::commit(this); 1282 } 1283 1284 // For native wrappers 1285 nmethod::nmethod( 1286 Method* method, 1287 CompilerType type, 1288 int nmethod_size, 1289 int compile_id, 1290 CodeOffsets* offsets, 1291 CodeBuffer* code_buffer, 1292 int frame_size, 1293 ByteSize basic_lock_owner_sp_offset, 1294 ByteSize basic_lock_sp_offset, 1295 OopMapSet* oop_maps ) 1296 : CodeBlob("native nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod), 1297 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 1298 _deoptimization_generation(0), 1299 _gc_epoch(CodeCache::gc_epoch()), 1300 _method(method), 1301 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 1302 _native_basic_lock_sp_offset(basic_lock_sp_offset) 1303 { 1304 { 1305 debug_only(NoSafepointVerifier nsv;) 1306 assert_locked_or_safepoint(CodeCache_lock); 1307 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); 1308 init_defaults(code_buffer, offsets); 1309 1310 _osr_entry_point = nullptr; 1311 _pc_desc_container = nullptr; 1312 _entry_bci = InvocationEntryBci; 1313 _compile_id = compile_id; 1314 _comp_level = CompLevel_none; 1315 _compiler_type = type; 1316 _orig_pc_offset = 0; 1317 _num_stack_arg_slots = 0; 1318 1319 if (offsets->value(CodeOffsets::Exceptions) != -1) { 1320 // Continuation enter intrinsic 1321 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 1322 } else { 1323 _exception_offset = 0; 1324 } 1325 // Native wrappers do not have deopt handlers. Make the values 1326 // something that will never match a pc like the nmethod vtable entry 1327 _deopt_handler_offset = 0; 1328 _deopt_mh_handler_offset = 0; 1329 _unwind_handler_offset = 0; 1330 1331 CHECKED_CAST(_metadata_offset, uint16_t, (align_up(code_buffer->total_oop_size(), oopSize))); 1332 int data_end_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 1333 #if INCLUDE_JVMCI 1334 // jvmci_data_size is 0 in native wrapper but we need to set offset 1335 // to correctly calculate metadata_end address 1336 CHECKED_CAST(_jvmci_data_offset, uint16_t, data_end_offset); 1337 #endif 1338 assert((data_offset() + data_end_offset) <= nmethod_size, "wrong nmethod's size: %d < %d", nmethod_size, (data_offset() + data_end_offset)); 1339 1340 // native wrapper does not have read-only data but we need unique not null address 1341 _immutable_data = data_end(); 1342 _immutable_data_size = 0; 1343 _nul_chk_table_offset = 0; 1344 _handler_table_offset = 0; 1345 _scopes_pcs_offset = 0; 1346 _scopes_data_offset = 0; 1347 #if INCLUDE_JVMCI 1348 _speculations_offset = 0; 1349 #endif 1350 1351 code_buffer->copy_code_and_locs_to(this); 1352 code_buffer->copy_values_to(this); 1353 1354 post_init(); 1355 } 1356 1357 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 1358 ttyLocker ttyl; // keep the following output all in one block 1359 // This output goes directly to the tty, not the compiler log. 1360 // To enable tools to match it up with the compilation activity, 1361 // be sure to tag this tty output with the compile ID. 1362 if (xtty != nullptr) { 1363 xtty->begin_head("print_native_nmethod"); 1364 xtty->method(_method); 1365 xtty->stamp(); 1366 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 1367 } 1368 // Print the header part, then print the requested information. 1369 // This is both handled in decode2(), called via print_code() -> decode() 1370 if (PrintNativeNMethods) { 1371 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------"); 1372 print_code(); 1373 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1374 #if defined(SUPPORT_DATA_STRUCTS) 1375 if (AbstractDisassembler::show_structs()) { 1376 if (oop_maps != nullptr) { 1377 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning 1378 oop_maps->print_on(tty); 1379 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1380 } 1381 } 1382 #endif 1383 } else { 1384 print(); // print the header part only. 1385 } 1386 #if defined(SUPPORT_DATA_STRUCTS) 1387 if (AbstractDisassembler::show_structs()) { 1388 if (PrintRelocations) { 1389 print_relocations(); 1390 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1391 } 1392 } 1393 #endif 1394 if (xtty != nullptr) { 1395 xtty->tail("print_native_nmethod"); 1396 } 1397 } 1398 } 1399 1400 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 1401 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 1402 } 1403 1404 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () { 1405 // Try MethodNonProfiled and MethodProfiled. 1406 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled); 1407 if (return_value != nullptr || !allow_NonNMethod_space) return return_value; 1408 // Try NonNMethod or give up. 1409 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod); 1410 } 1411 1412 // For normal JIT compiled code 1413 nmethod::nmethod( 1414 Method* method, 1415 CompilerType type, 1416 int nmethod_size, 1417 int immutable_data_size, 1418 int compile_id, 1419 int entry_bci, 1420 address immutable_data, 1421 CodeOffsets* offsets, 1422 int orig_pc_offset, 1423 DebugInformationRecorder* debug_info, 1424 Dependencies* dependencies, 1425 CodeBuffer *code_buffer, 1426 int frame_size, 1427 OopMapSet* oop_maps, 1428 ExceptionHandlerTable* handler_table, 1429 ImplicitExceptionTable* nul_chk_table, 1430 AbstractCompiler* compiler, 1431 CompLevel comp_level 1432 #if INCLUDE_JVMCI 1433 , char* speculations, 1434 int speculations_len, 1435 JVMCINMethodData* jvmci_data 1436 #endif 1437 ) 1438 : CodeBlob("nmethod", CodeBlobKind::Nmethod, code_buffer, nmethod_size, sizeof(nmethod), 1439 offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 1440 _deoptimization_generation(0), 1441 _gc_epoch(CodeCache::gc_epoch()), 1442 _method(method), 1443 _osr_link(nullptr) 1444 { 1445 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 1446 { 1447 debug_only(NoSafepointVerifier nsv;) 1448 assert_locked_or_safepoint(CodeCache_lock); 1449 1450 init_defaults(code_buffer, offsets); 1451 1452 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 1453 _entry_bci = entry_bci; 1454 _compile_id = compile_id; 1455 _comp_level = comp_level; 1456 _compiler_type = type; 1457 _orig_pc_offset = orig_pc_offset; 1458 1459 _num_stack_arg_slots = entry_bci != InvocationEntryBci ? 0 : _method->constMethod()->num_stack_arg_slots(); 1460 1461 set_ctable_begin(header_begin() + content_offset()); 1462 1463 #if INCLUDE_JVMCI 1464 if (compiler->is_jvmci()) { 1465 // JVMCI might not produce any stub sections 1466 if (offsets->value(CodeOffsets::Exceptions) != -1) { 1467 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 1468 } else { 1469 _exception_offset = -1; 1470 } 1471 if (offsets->value(CodeOffsets::Deopt) != -1) { 1472 _deopt_handler_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 1473 } else { 1474 _deopt_handler_offset = -1; 1475 } 1476 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 1477 _deopt_mh_handler_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 1478 } else { 1479 _deopt_mh_handler_offset = -1; 1480 } 1481 } else 1482 #endif 1483 { 1484 // Exception handler and deopt handler are in the stub section 1485 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 1486 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 1487 1488 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 1489 _deopt_handler_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 1490 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 1491 _deopt_mh_handler_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 1492 } else { 1493 _deopt_mh_handler_offset = -1; 1494 } 1495 } 1496 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 1497 // C1 generates UnwindHandler at the end of instructions section. 1498 // Calculate positive offset as distance between the start of stubs section 1499 // (which is also the end of instructions section) and the start of the handler. 1500 int unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 1501 CHECKED_CAST(_unwind_handler_offset, int16_t, (_stub_offset - unwind_handler_offset)); 1502 } else { 1503 _unwind_handler_offset = -1; 1504 } 1505 CHECKED_CAST(_metadata_offset, uint16_t, (align_up(code_buffer->total_oop_size(), oopSize))); 1506 int metadata_end_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 1507 1508 #if INCLUDE_JVMCI 1509 CHECKED_CAST(_jvmci_data_offset, uint16_t, metadata_end_offset); 1510 int jvmci_data_size = compiler->is_jvmci() ? jvmci_data->size() : 0; 1511 DEBUG_ONLY( int data_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); ) 1512 #else 1513 DEBUG_ONLY( int data_end_offset = metadata_end_offset; ) 1514 #endif 1515 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry); 1516 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry); 1517 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO); 1518 assert((data_offset() + data_end_offset) <= nmethod_size, "wrong nmethod's size: %d > %d", 1519 (data_offset() + data_end_offset), nmethod_size); 1520 1521 _immutable_data_size = immutable_data_size; 1522 if (immutable_data_size > 0) { 1523 assert(immutable_data != nullptr, "required"); 1524 _immutable_data = immutable_data; 1525 } else { 1526 // We need unique not null address 1527 _immutable_data = data_end(); 1528 } 1529 CHECKED_CAST(_nul_chk_table_offset, uint16_t, (align_up((int)dependencies->size_in_bytes(), oopSize))); 1530 CHECKED_CAST(_handler_table_offset, uint16_t, (_nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize))); 1531 _scopes_pcs_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 1532 _scopes_data_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 1533 1534 #if INCLUDE_JVMCI 1535 _speculations_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); 1536 DEBUG_ONLY( int immutable_data_end_offset = _speculations_offset + align_up(speculations_len, oopSize); ) 1537 #else 1538 DEBUG_ONLY( int immutable_data_end_offset = _scopes_data_offset + align_up(debug_info->data_size(), oopSize); ) 1539 #endif 1540 assert(immutable_data_end_offset <= immutable_data_size, "wrong read-only data size: %d > %d", 1541 immutable_data_end_offset, immutable_data_size); 1542 1543 // Copy code and relocation info 1544 code_buffer->copy_code_and_locs_to(this); 1545 // Copy oops and metadata 1546 code_buffer->copy_values_to(this); 1547 dependencies->copy_to(this); 1548 // Copy PcDesc and ScopeDesc data 1549 debug_info->copy_to(this); 1550 1551 // Create cache after PcDesc data is copied - it will be used to initialize cache 1552 _pc_desc_container = new PcDescContainer(scopes_pcs_begin()); 1553 1554 #if INCLUDE_JVMCI 1555 if (compiler->is_jvmci()) { 1556 // Initialize the JVMCINMethodData object inlined into nm 1557 jvmci_nmethod_data()->copy(jvmci_data); 1558 } 1559 #endif 1560 1561 // Copy contents of ExceptionHandlerTable to nmethod 1562 handler_table->copy_to(this); 1563 nul_chk_table->copy_to(this); 1564 1565 #if INCLUDE_JVMCI 1566 // Copy speculations to nmethod 1567 if (speculations_size() != 0) { 1568 memcpy(speculations_begin(), speculations, speculations_len); 1569 } 1570 #endif 1571 1572 post_init(); 1573 1574 // we use the information of entry points to find out if a method is 1575 // static or non static 1576 assert(compiler->is_c2() || compiler->is_jvmci() || 1577 _method->is_static() == (entry_point() == verified_entry_point()), 1578 " entry points must be same for static methods and vice versa"); 1579 } 1580 } 1581 1582 // Print a short set of xml attributes to identify this nmethod. The 1583 // output should be embedded in some other element. 1584 void nmethod::log_identity(xmlStream* log) const { 1585 log->print(" compile_id='%d'", compile_id()); 1586 const char* nm_kind = compile_kind(); 1587 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind); 1588 log->print(" compiler='%s'", compiler_name()); 1589 if (TieredCompilation) { 1590 log->print(" level='%d'", comp_level()); 1591 } 1592 #if INCLUDE_JVMCI 1593 if (jvmci_nmethod_data() != nullptr) { 1594 const char* jvmci_name = jvmci_nmethod_data()->name(); 1595 if (jvmci_name != nullptr) { 1596 log->print(" jvmci_mirror_name='"); 1597 log->text("%s", jvmci_name); 1598 log->print("'"); 1599 } 1600 } 1601 #endif 1602 } 1603 1604 1605 #define LOG_OFFSET(log, name) \ 1606 if (p2i(name##_end()) - p2i(name##_begin())) \ 1607 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 1608 p2i(name##_begin()) - p2i(this)) 1609 1610 1611 void nmethod::log_new_nmethod() const { 1612 if (LogCompilation && xtty != nullptr) { 1613 ttyLocker ttyl; 1614 xtty->begin_elem("nmethod"); 1615 log_identity(xtty); 1616 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 1617 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 1618 1619 LOG_OFFSET(xtty, relocation); 1620 LOG_OFFSET(xtty, consts); 1621 LOG_OFFSET(xtty, insts); 1622 LOG_OFFSET(xtty, stub); 1623 LOG_OFFSET(xtty, scopes_data); 1624 LOG_OFFSET(xtty, scopes_pcs); 1625 LOG_OFFSET(xtty, dependencies); 1626 LOG_OFFSET(xtty, handler_table); 1627 LOG_OFFSET(xtty, nul_chk_table); 1628 LOG_OFFSET(xtty, oops); 1629 LOG_OFFSET(xtty, metadata); 1630 1631 xtty->method(method()); 1632 xtty->stamp(); 1633 xtty->end_elem(); 1634 } 1635 } 1636 1637 #undef LOG_OFFSET 1638 1639 1640 // Print out more verbose output usually for a newly created nmethod. 1641 void nmethod::print_on(outputStream* st, const char* msg) const { 1642 if (st != nullptr) { 1643 ttyLocker ttyl; 1644 if (WizardMode) { 1645 CompileTask::print(st, this, msg, /*short_form:*/ true); 1646 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 1647 } else { 1648 CompileTask::print(st, this, msg, /*short_form:*/ false); 1649 } 1650 } 1651 } 1652 1653 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) { 1654 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 1655 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 1656 print_nmethod(printnmethods); 1657 } 1658 } 1659 1660 void nmethod::print_nmethod(bool printmethod) { 1661 ttyLocker ttyl; // keep the following output all in one block 1662 if (xtty != nullptr) { 1663 xtty->begin_head("print_nmethod"); 1664 log_identity(xtty); 1665 xtty->stamp(); 1666 xtty->end_head(); 1667 } 1668 // Print the header part, then print the requested information. 1669 // This is both handled in decode2(). 1670 if (printmethod) { 1671 ResourceMark m; 1672 if (is_compiled_by_c1()) { 1673 tty->cr(); 1674 tty->print_cr("============================= C1-compiled nmethod =============================="); 1675 } 1676 if (is_compiled_by_jvmci()) { 1677 tty->cr(); 1678 tty->print_cr("=========================== JVMCI-compiled nmethod ============================="); 1679 } 1680 tty->print_cr("----------------------------------- Assembly -----------------------------------"); 1681 decode2(tty); 1682 #if defined(SUPPORT_DATA_STRUCTS) 1683 if (AbstractDisassembler::show_structs()) { 1684 // Print the oops from the underlying CodeBlob as well. 1685 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1686 print_oops(tty); 1687 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1688 print_metadata(tty); 1689 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1690 print_pcs_on(tty); 1691 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1692 if (oop_maps() != nullptr) { 1693 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning 1694 oop_maps()->print_on(tty); 1695 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1696 } 1697 } 1698 #endif 1699 } else { 1700 print(); // print the header part only. 1701 } 1702 1703 #if defined(SUPPORT_DATA_STRUCTS) 1704 if (AbstractDisassembler::show_structs()) { 1705 methodHandle mh(Thread::current(), _method); 1706 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDebugInfo)) { 1707 print_scopes(); 1708 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1709 } 1710 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommandEnum::PrintRelocations)) { 1711 print_relocations(); 1712 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1713 } 1714 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommandEnum::PrintDependencies)) { 1715 print_dependencies_on(tty); 1716 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1717 } 1718 if (printmethod || PrintExceptionHandlers) { 1719 print_handler_table(); 1720 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1721 print_nul_chk_table(); 1722 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1723 } 1724 1725 if (printmethod) { 1726 print_recorded_oops(); 1727 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1728 print_recorded_metadata(); 1729 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1730 } 1731 } 1732 #endif 1733 1734 if (xtty != nullptr) { 1735 xtty->tail("print_nmethod"); 1736 } 1737 } 1738 1739 1740 // Promote one word from an assembly-time handle to a live embedded oop. 1741 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1742 if (handle == nullptr || 1743 // As a special case, IC oops are initialized to 1 or -1. 1744 handle == (jobject) Universe::non_oop_word()) { 1745 *(void**)dest = handle; 1746 } else { 1747 *dest = JNIHandles::resolve_non_null(handle); 1748 } 1749 } 1750 1751 1752 // Have to have the same name because it's called by a template 1753 void nmethod::copy_values(GrowableArray<jobject>* array) { 1754 int length = array->length(); 1755 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1756 oop* dest = oops_begin(); 1757 for (int index = 0 ; index < length; index++) { 1758 initialize_immediate_oop(&dest[index], array->at(index)); 1759 } 1760 1761 // Now we can fix up all the oops in the code. We need to do this 1762 // in the code because the assembler uses jobjects as placeholders. 1763 // The code and relocations have already been initialized by the 1764 // CodeBlob constructor, so it is valid even at this early point to 1765 // iterate over relocations and patch the code. 1766 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true); 1767 } 1768 1769 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1770 int length = array->length(); 1771 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1772 Metadata** dest = metadata_begin(); 1773 for (int index = 0 ; index < length; index++) { 1774 dest[index] = array->at(index); 1775 } 1776 } 1777 1778 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1779 // re-patch all oop-bearing instructions, just in case some oops moved 1780 RelocIterator iter(this, begin, end); 1781 while (iter.next()) { 1782 if (iter.type() == relocInfo::oop_type) { 1783 oop_Relocation* reloc = iter.oop_reloc(); 1784 if (initialize_immediates && reloc->oop_is_immediate()) { 1785 oop* dest = reloc->oop_addr(); 1786 jobject obj = *reinterpret_cast<jobject*>(dest); 1787 initialize_immediate_oop(dest, obj); 1788 } 1789 // Refresh the oop-related bits of this instruction. 1790 reloc->fix_oop_relocation(); 1791 } else if (iter.type() == relocInfo::metadata_type) { 1792 metadata_Relocation* reloc = iter.metadata_reloc(); 1793 reloc->fix_metadata_relocation(); 1794 } 1795 } 1796 } 1797 1798 static void install_post_call_nop_displacement(nmethod* nm, address pc) { 1799 NativePostCallNop* nop = nativePostCallNop_at((address) pc); 1800 intptr_t cbaddr = (intptr_t) nm; 1801 intptr_t offset = ((intptr_t) pc) - cbaddr; 1802 1803 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin())); 1804 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks 1805 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset); 1806 } else if (!nop->patch(oopmap_slot, offset)) { 1807 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset); 1808 } 1809 } 1810 1811 void nmethod::finalize_relocations() { 1812 NoSafepointVerifier nsv; 1813 1814 GrowableArray<NativeMovConstReg*> virtual_call_data; 1815 1816 // Make sure that post call nops fill in nmethod offsets eagerly so 1817 // we don't have to race with deoptimization 1818 RelocIterator iter(this); 1819 while (iter.next()) { 1820 if (iter.type() == relocInfo::virtual_call_type) { 1821 virtual_call_Relocation* r = iter.virtual_call_reloc(); 1822 NativeMovConstReg* value = nativeMovConstReg_at(r->cached_value()); 1823 virtual_call_data.append(value); 1824 } else if (iter.type() == relocInfo::post_call_nop_type) { 1825 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc(); 1826 address pc = reloc->addr(); 1827 install_post_call_nop_displacement(this, pc); 1828 } 1829 } 1830 1831 if (virtual_call_data.length() > 0) { 1832 // We allocate a block of CompiledICData per nmethod so the GC can purge this faster. 1833 _compiled_ic_data = new CompiledICData[virtual_call_data.length()]; 1834 CompiledICData* next_data = _compiled_ic_data; 1835 1836 for (NativeMovConstReg* value : virtual_call_data) { 1837 value->set_data((intptr_t)next_data); 1838 next_data++; 1839 } 1840 } 1841 } 1842 1843 void nmethod::make_deoptimized() { 1844 if (!Continuations::enabled()) { 1845 // Don't deopt this again. 1846 set_deoptimized_done(); 1847 return; 1848 } 1849 1850 assert(method() == nullptr || can_be_deoptimized(), ""); 1851 1852 CompiledICLocker ml(this); 1853 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1854 1855 // If post call nops have been already patched, we can just bail-out. 1856 if (has_been_deoptimized()) { 1857 return; 1858 } 1859 1860 ResourceMark rm; 1861 RelocIterator iter(this, oops_reloc_begin()); 1862 1863 while (iter.next()) { 1864 1865 switch (iter.type()) { 1866 case relocInfo::virtual_call_type: { 1867 CompiledIC *ic = CompiledIC_at(&iter); 1868 address pc = ic->end_of_call(); 1869 NativePostCallNop* nop = nativePostCallNop_at(pc); 1870 if (nop != nullptr) { 1871 nop->make_deopt(); 1872 } 1873 assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); 1874 break; 1875 } 1876 case relocInfo::static_call_type: 1877 case relocInfo::opt_virtual_call_type: { 1878 CompiledDirectCall *csc = CompiledDirectCall::at(iter.reloc()); 1879 address pc = csc->end_of_call(); 1880 NativePostCallNop* nop = nativePostCallNop_at(pc); 1881 //tty->print_cr(" - static pc %p", pc); 1882 if (nop != nullptr) { 1883 nop->make_deopt(); 1884 } 1885 // We can't assert here, there are some calls to stubs / runtime 1886 // that have reloc data and doesn't have a post call NOP. 1887 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); 1888 break; 1889 } 1890 default: 1891 break; 1892 } 1893 } 1894 // Don't deopt this again. 1895 set_deoptimized_done(); 1896 } 1897 1898 void nmethod::verify_clean_inline_caches() { 1899 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1900 1901 ResourceMark rm; 1902 RelocIterator iter(this, oops_reloc_begin()); 1903 while(iter.next()) { 1904 switch(iter.type()) { 1905 case relocInfo::virtual_call_type: { 1906 CompiledIC *ic = CompiledIC_at(&iter); 1907 CodeBlob *cb = CodeCache::find_blob(ic->destination()); 1908 assert(cb != nullptr, "destination not in CodeBlob?"); 1909 nmethod* nm = cb->as_nmethod_or_null(); 1910 if (nm != nullptr) { 1911 // Verify that inline caches pointing to bad nmethods are clean 1912 if (!nm->is_in_use() || nm->is_unloading()) { 1913 assert(ic->is_clean(), "IC should be clean"); 1914 } 1915 } 1916 break; 1917 } 1918 case relocInfo::static_call_type: 1919 case relocInfo::opt_virtual_call_type: { 1920 CompiledDirectCall *cdc = CompiledDirectCall::at(iter.reloc()); 1921 CodeBlob *cb = CodeCache::find_blob(cdc->destination()); 1922 assert(cb != nullptr, "destination not in CodeBlob?"); 1923 nmethod* nm = cb->as_nmethod_or_null(); 1924 if (nm != nullptr) { 1925 // Verify that inline caches pointing to bad nmethods are clean 1926 if (!nm->is_in_use() || nm->is_unloading() || nm->method()->code() != nm) { 1927 assert(cdc->is_clean(), "IC should be clean"); 1928 } 1929 } 1930 break; 1931 } 1932 default: 1933 break; 1934 } 1935 } 1936 } 1937 1938 void nmethod::mark_as_maybe_on_stack() { 1939 Atomic::store(&_gc_epoch, CodeCache::gc_epoch()); 1940 } 1941 1942 bool nmethod::is_maybe_on_stack() { 1943 // If the condition below is true, it means that the nmethod was found to 1944 // be alive the previous completed marking cycle. 1945 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle(); 1946 } 1947 1948 void nmethod::inc_decompile_count() { 1949 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1950 // Could be gated by ProfileTraps, but do not bother... 1951 Method* m = method(); 1952 if (m == nullptr) return; 1953 MethodData* mdo = m->method_data(); 1954 if (mdo == nullptr) return; 1955 // There is a benign race here. See comments in methodData.hpp. 1956 mdo->inc_decompile_count(); 1957 } 1958 1959 bool nmethod::try_transition(signed char new_state_int) { 1960 signed char new_state = new_state_int; 1961 assert_lock_strong(NMethodState_lock); 1962 signed char old_state = _state; 1963 if (old_state >= new_state) { 1964 // Ensure monotonicity of transitions. 1965 return false; 1966 } 1967 Atomic::store(&_state, new_state); 1968 return true; 1969 } 1970 1971 void nmethod::invalidate_osr_method() { 1972 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1973 // Remove from list of active nmethods 1974 if (method() != nullptr) { 1975 method()->method_holder()->remove_osr_nmethod(this); 1976 } 1977 } 1978 1979 void nmethod::log_state_change() const { 1980 if (LogCompilation) { 1981 if (xtty != nullptr) { 1982 ttyLocker ttyl; // keep the following output all in one block 1983 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'", 1984 os::current_thread_id()); 1985 log_identity(xtty); 1986 xtty->stamp(); 1987 xtty->end_elem(); 1988 } 1989 } 1990 1991 CompileTask::print_ul(this, "made not entrant"); 1992 if (PrintCompilation) { 1993 print_on(tty, "made not entrant"); 1994 } 1995 } 1996 1997 void nmethod::unlink_from_method() { 1998 if (method() != nullptr) { 1999 method()->unlink_code(this); 2000 } 2001 } 2002 2003 // Invalidate code 2004 bool nmethod::make_not_entrant() { 2005 // This can be called while the system is already at a safepoint which is ok 2006 NoSafepointVerifier nsv; 2007 2008 if (is_unloading()) { 2009 // If the nmethod is unloading, then it is already not entrant through 2010 // the nmethod entry barriers. No need to do anything; GC will unload it. 2011 return false; 2012 } 2013 2014 if (Atomic::load(&_state) == not_entrant) { 2015 // Avoid taking the lock if already in required state. 2016 // This is safe from races because the state is an end-state, 2017 // which the nmethod cannot back out of once entered. 2018 // No need for fencing either. 2019 return false; 2020 } 2021 2022 { 2023 // Enter critical section. Does not block for safepoint. 2024 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag); 2025 2026 if (Atomic::load(&_state) == not_entrant) { 2027 // another thread already performed this transition so nothing 2028 // to do, but return false to indicate this. 2029 return false; 2030 } 2031 2032 if (is_osr_method()) { 2033 // This logic is equivalent to the logic below for patching the 2034 // verified entry point of regular methods. 2035 // this effectively makes the osr nmethod not entrant 2036 invalidate_osr_method(); 2037 } else { 2038 // The caller can be calling the method statically or through an inline 2039 // cache call. 2040 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 2041 SharedRuntime::get_handle_wrong_method_stub()); 2042 } 2043 2044 if (update_recompile_counts()) { 2045 // Mark the method as decompiled. 2046 inc_decompile_count(); 2047 } 2048 2049 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 2050 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { 2051 // If nmethod entry barriers are not supported, we won't mark 2052 // nmethods as on-stack when they become on-stack. So we 2053 // degrade to a less accurate flushing strategy, for now. 2054 mark_as_maybe_on_stack(); 2055 } 2056 2057 // Change state 2058 bool success = try_transition(not_entrant); 2059 assert(success, "Transition can't fail"); 2060 2061 // Log the transition once 2062 log_state_change(); 2063 2064 // Remove nmethod from method. 2065 unlink_from_method(); 2066 2067 } // leave critical region under NMethodState_lock 2068 2069 #if INCLUDE_JVMCI 2070 // Invalidate can't occur while holding the NMethodState_lock 2071 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 2072 if (nmethod_data != nullptr) { 2073 nmethod_data->invalidate_nmethod_mirror(this); 2074 } 2075 #endif 2076 2077 #ifdef ASSERT 2078 if (is_osr_method() && method() != nullptr) { 2079 // Make sure osr nmethod is invalidated, i.e. not on the list 2080 bool found = method()->method_holder()->remove_osr_nmethod(this); 2081 assert(!found, "osr nmethod should have been invalidated"); 2082 } 2083 #endif 2084 2085 return true; 2086 } 2087 2088 // For concurrent GCs, there must be a handshake between unlink and flush 2089 void nmethod::unlink() { 2090 if (is_unlinked()) { 2091 // Already unlinked. 2092 return; 2093 } 2094 2095 flush_dependencies(); 2096 2097 // unlink_from_method will take the NMethodState_lock. 2098 // In this case we don't strictly need it when unlinking nmethods from 2099 // the Method, because it is only concurrently unlinked by 2100 // the entry barrier, which acquires the per nmethod lock. 2101 unlink_from_method(); 2102 2103 if (is_osr_method()) { 2104 invalidate_osr_method(); 2105 } 2106 2107 #if INCLUDE_JVMCI 2108 // Clear the link between this nmethod and a HotSpotNmethod mirror 2109 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 2110 if (nmethod_data != nullptr) { 2111 nmethod_data->invalidate_nmethod_mirror(this); 2112 } 2113 #endif 2114 2115 // Post before flushing as jmethodID is being used 2116 post_compiled_method_unload(); 2117 2118 // Register for flushing when it is safe. For concurrent class unloading, 2119 // that would be after the unloading handshake, and for STW class unloading 2120 // that would be when getting back to the VM thread. 2121 ClassUnloadingContext::context()->register_unlinked_nmethod(this); 2122 } 2123 2124 void nmethod::purge(bool unregister_nmethod) { 2125 2126 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2127 2128 // completely deallocate this method 2129 Events::log_nmethod_flush(Thread::current(), "flushing %s nmethod " INTPTR_FORMAT, is_osr_method() ? "osr" : "", p2i(this)); 2130 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 2131 "/Free CodeCache:" SIZE_FORMAT "Kb", 2132 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 2133 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 2134 2135 // We need to deallocate any ExceptionCache data. 2136 // Note that we do not need to grab the nmethod lock for this, it 2137 // better be thread safe if we're disposing of it! 2138 ExceptionCache* ec = exception_cache(); 2139 while(ec != nullptr) { 2140 ExceptionCache* next = ec->next(); 2141 delete ec; 2142 ec = next; 2143 } 2144 if (_pc_desc_container != nullptr) { 2145 delete _pc_desc_container; 2146 } 2147 delete[] _compiled_ic_data; 2148 2149 if (_immutable_data != data_end()) { 2150 os::free(_immutable_data); 2151 _immutable_data = data_end(); // Valid not null address 2152 } 2153 if (unregister_nmethod) { 2154 Universe::heap()->unregister_nmethod(this); 2155 } 2156 CodeCache::unregister_old_nmethod(this); 2157 2158 CodeBlob::purge(); 2159 } 2160 2161 oop nmethod::oop_at(int index) const { 2162 if (index == 0) { 2163 return nullptr; 2164 } 2165 return NMethodAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 2166 } 2167 2168 oop nmethod::oop_at_phantom(int index) const { 2169 if (index == 0) { 2170 return nullptr; 2171 } 2172 return NMethodAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); 2173 } 2174 2175 // 2176 // Notify all classes this nmethod is dependent on that it is no 2177 // longer dependent. 2178 2179 void nmethod::flush_dependencies() { 2180 if (!has_flushed_dependencies()) { 2181 set_has_flushed_dependencies(true); 2182 for (Dependencies::DepStream deps(this); deps.next(); ) { 2183 if (deps.type() == Dependencies::call_site_target_value) { 2184 // CallSite dependencies are managed on per-CallSite instance basis. 2185 oop call_site = deps.argument_oop(0); 2186 MethodHandles::clean_dependency_context(call_site); 2187 } else { 2188 InstanceKlass* ik = deps.context_type(); 2189 if (ik == nullptr) { 2190 continue; // ignore things like evol_method 2191 } 2192 // During GC liveness of dependee determines class that needs to be updated. 2193 // The GC may clean dependency contexts concurrently and in parallel. 2194 ik->clean_dependency_context(); 2195 } 2196 } 2197 } 2198 } 2199 2200 void nmethod::post_compiled_method(CompileTask* task) { 2201 task->mark_success(); 2202 task->set_nm_content_size(content_size()); 2203 task->set_nm_insts_size(insts_size()); 2204 task->set_nm_total_size(total_size()); 2205 2206 // JVMTI -- compiled method notification (must be done outside lock) 2207 post_compiled_method_load_event(); 2208 2209 if (CompilationLog::log() != nullptr) { 2210 CompilationLog::log()->log_nmethod(JavaThread::current(), this); 2211 } 2212 2213 const DirectiveSet* directive = task->directive(); 2214 maybe_print_nmethod(directive); 2215 } 2216 2217 // ------------------------------------------------------------------ 2218 // post_compiled_method_load_event 2219 // new method for install_code() path 2220 // Transfer information from compilation to jvmti 2221 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) { 2222 // This is a bad time for a safepoint. We don't want 2223 // this nmethod to get unloaded while we're queueing the event. 2224 NoSafepointVerifier nsv; 2225 2226 Method* m = method(); 2227 HOTSPOT_COMPILED_METHOD_LOAD( 2228 (char *) m->klass_name()->bytes(), 2229 m->klass_name()->utf8_length(), 2230 (char *) m->name()->bytes(), 2231 m->name()->utf8_length(), 2232 (char *) m->signature()->bytes(), 2233 m->signature()->utf8_length(), 2234 insts_begin(), insts_size()); 2235 2236 2237 if (JvmtiExport::should_post_compiled_method_load()) { 2238 // Only post unload events if load events are found. 2239 set_load_reported(); 2240 // If a JavaThread hasn't been passed in, let the Service thread 2241 // (which is a real Java thread) post the event 2242 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this); 2243 if (state == nullptr) { 2244 // Execute any barrier code for this nmethod as if it's called, since 2245 // keeping it alive looks like stack walking. 2246 run_nmethod_entry_barrier(); 2247 ServiceThread::enqueue_deferred_event(&event); 2248 } else { 2249 // This enters the nmethod barrier outside in the caller. 2250 state->enqueue_event(&event); 2251 } 2252 } 2253 } 2254 2255 void nmethod::post_compiled_method_unload() { 2256 assert(_method != nullptr, "just checking"); 2257 DTRACE_METHOD_UNLOAD_PROBE(method()); 2258 2259 // If a JVMTI agent has enabled the CompiledMethodUnload event then 2260 // post the event. The Method* will not be valid when this is freed. 2261 2262 // Don't bother posting the unload if the load event wasn't posted. 2263 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) { 2264 JvmtiDeferredEvent event = 2265 JvmtiDeferredEvent::compiled_method_unload_event( 2266 method()->jmethod_id(), insts_begin()); 2267 ServiceThread::enqueue_deferred_event(&event); 2268 } 2269 } 2270 2271 // Iterate over metadata calling this function. Used by RedefineClasses 2272 void nmethod::metadata_do(MetadataClosure* f) { 2273 { 2274 // Visit all immediate references that are embedded in the instruction stream. 2275 RelocIterator iter(this, oops_reloc_begin()); 2276 while (iter.next()) { 2277 if (iter.type() == relocInfo::metadata_type) { 2278 metadata_Relocation* r = iter.metadata_reloc(); 2279 // In this metadata, we must only follow those metadatas directly embedded in 2280 // the code. Other metadatas (oop_index>0) are seen as part of 2281 // the metadata section below. 2282 assert(1 == (r->metadata_is_immediate()) + 2283 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2284 "metadata must be found in exactly one place"); 2285 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) { 2286 Metadata* md = r->metadata_value(); 2287 if (md != _method) f->do_metadata(md); 2288 } 2289 } else if (iter.type() == relocInfo::virtual_call_type) { 2290 // Check compiledIC holders associated with this nmethod 2291 ResourceMark rm; 2292 CompiledIC *ic = CompiledIC_at(&iter); 2293 ic->metadata_do(f); 2294 } 2295 } 2296 } 2297 2298 // Visit the metadata section 2299 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2300 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops 2301 Metadata* md = *p; 2302 f->do_metadata(md); 2303 } 2304 2305 // Visit metadata not embedded in the other places. 2306 if (_method != nullptr) f->do_metadata(_method); 2307 } 2308 2309 // Heuristic for nuking nmethods even though their oops are live. 2310 // Main purpose is to reduce code cache pressure and get rid of 2311 // nmethods that don't seem to be all that relevant any longer. 2312 bool nmethod::is_cold() { 2313 if (!MethodFlushing || is_native_method() || is_not_installed()) { 2314 // No heuristic unloading at all 2315 return false; 2316 } 2317 2318 if (!is_maybe_on_stack() && is_not_entrant()) { 2319 // Not entrant nmethods that are not on any stack can just 2320 // be removed 2321 return true; 2322 } 2323 2324 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 2325 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { 2326 // On platforms that don't support nmethod entry barriers, we can't 2327 // trust the temporal aspect of the gc epochs. So we can't detect 2328 // cold nmethods on such platforms. 2329 return false; 2330 } 2331 2332 if (!UseCodeCacheFlushing) { 2333 // Bail out if we don't heuristically remove nmethods 2334 return false; 2335 } 2336 2337 // Other code can be phased out more gradually after N GCs 2338 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count(); 2339 } 2340 2341 // The _is_unloading_state encodes a tuple comprising the unloading cycle 2342 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle. 2343 // This is the bit layout of the _is_unloading_state byte: 00000CCU 2344 // CC refers to the cycle, which has 2 bits, and U refers to the result of 2345 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 2346 2347 class IsUnloadingState: public AllStatic { 2348 static const uint8_t _is_unloading_mask = 1; 2349 static const uint8_t _is_unloading_shift = 0; 2350 static const uint8_t _unloading_cycle_mask = 6; 2351 static const uint8_t _unloading_cycle_shift = 1; 2352 2353 static uint8_t set_is_unloading(uint8_t state, bool value) { 2354 state &= (uint8_t)~_is_unloading_mask; 2355 if (value) { 2356 state |= 1 << _is_unloading_shift; 2357 } 2358 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 2359 return state; 2360 } 2361 2362 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 2363 state &= (uint8_t)~_unloading_cycle_mask; 2364 state |= (uint8_t)(value << _unloading_cycle_shift); 2365 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 2366 return state; 2367 } 2368 2369 public: 2370 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 2371 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 2372 2373 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 2374 uint8_t state = 0; 2375 state = set_is_unloading(state, is_unloading); 2376 state = set_unloading_cycle(state, unloading_cycle); 2377 return state; 2378 } 2379 }; 2380 2381 bool nmethod::is_unloading() { 2382 uint8_t state = Atomic::load(&_is_unloading_state); 2383 bool state_is_unloading = IsUnloadingState::is_unloading(state); 2384 if (state_is_unloading) { 2385 return true; 2386 } 2387 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 2388 uint8_t current_cycle = CodeCache::unloading_cycle(); 2389 if (state_unloading_cycle == current_cycle) { 2390 return false; 2391 } 2392 2393 // The IsUnloadingBehaviour is responsible for calculating if the nmethod 2394 // should be unloaded. This can be either because there is a dead oop, 2395 // or because is_cold() heuristically determines it is time to unload. 2396 state_unloading_cycle = current_cycle; 2397 state_is_unloading = IsUnloadingBehaviour::is_unloading(this); 2398 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 2399 2400 // Note that if an nmethod has dead oops, everyone will agree that the 2401 // nmethod is_unloading. However, the is_cold heuristics can yield 2402 // different outcomes, so we guard the computed result with a CAS 2403 // to ensure all threads have a shared view of whether an nmethod 2404 // is_unloading or not. 2405 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed); 2406 2407 if (found_state == state) { 2408 // First to change state, we win 2409 return state_is_unloading; 2410 } else { 2411 // State already set, so use it 2412 return IsUnloadingState::is_unloading(found_state); 2413 } 2414 } 2415 2416 void nmethod::clear_unloading_state() { 2417 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 2418 Atomic::store(&_is_unloading_state, state); 2419 } 2420 2421 2422 // This is called at the end of the strong tracing/marking phase of a 2423 // GC to unload an nmethod if it contains otherwise unreachable 2424 // oops or is heuristically found to be not important. 2425 void nmethod::do_unloading(bool unloading_occurred) { 2426 // Make sure the oop's ready to receive visitors 2427 if (is_unloading()) { 2428 unlink(); 2429 } else { 2430 unload_nmethod_caches(unloading_occurred); 2431 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 2432 if (bs_nm != nullptr) { 2433 bs_nm->disarm(this); 2434 } 2435 } 2436 } 2437 2438 void nmethod::oops_do(OopClosure* f, bool allow_dead) { 2439 // Prevent extra code cache walk for platforms that don't have immediate oops. 2440 if (relocInfo::mustIterateImmediateOopsInCode()) { 2441 RelocIterator iter(this, oops_reloc_begin()); 2442 2443 while (iter.next()) { 2444 if (iter.type() == relocInfo::oop_type ) { 2445 oop_Relocation* r = iter.oop_reloc(); 2446 // In this loop, we must only follow those oops directly embedded in 2447 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2448 assert(1 == (r->oop_is_immediate()) + 2449 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2450 "oop must be found in exactly one place"); 2451 if (r->oop_is_immediate() && r->oop_value() != nullptr) { 2452 f->do_oop(r->oop_addr()); 2453 } 2454 } 2455 } 2456 } 2457 2458 // Scopes 2459 // This includes oop constants not inlined in the code stream. 2460 for (oop* p = oops_begin(); p < oops_end(); p++) { 2461 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2462 f->do_oop(p); 2463 } 2464 } 2465 2466 void nmethod::follow_nmethod(OopIterateClosure* cl) { 2467 // Process oops in the nmethod 2468 oops_do(cl); 2469 2470 // CodeCache unloading support 2471 mark_as_maybe_on_stack(); 2472 2473 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 2474 bs_nm->disarm(this); 2475 2476 // There's an assumption made that this function is not used by GCs that 2477 // relocate objects, and therefore we don't call fix_oop_relocations. 2478 } 2479 2480 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2481 2482 void nmethod::oops_do_log_change(const char* state) { 2483 LogTarget(Trace, gc, nmethod) lt; 2484 if (lt.is_enabled()) { 2485 LogStream ls(lt); 2486 CompileTask::print(&ls, this, state, true /* short_form */); 2487 } 2488 } 2489 2490 bool nmethod::oops_do_try_claim() { 2491 if (oops_do_try_claim_weak_request()) { 2492 nmethod* result = oops_do_try_add_to_list_as_weak_done(); 2493 assert(result == nullptr, "adding to global list as weak done must always succeed."); 2494 return true; 2495 } 2496 return false; 2497 } 2498 2499 bool nmethod::oops_do_try_claim_weak_request() { 2500 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 2501 2502 if ((_oops_do_mark_link == nullptr) && 2503 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) { 2504 oops_do_log_change("oops_do, mark weak request"); 2505 return true; 2506 } 2507 return false; 2508 } 2509 2510 void nmethod::oops_do_set_strong_done(nmethod* old_head) { 2511 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag); 2512 } 2513 2514 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() { 2515 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 2516 2517 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)); 2518 if (old_next == nullptr) { 2519 oops_do_log_change("oops_do, mark strong done"); 2520 } 2521 return old_next; 2522 } 2523 2524 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) { 2525 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 2526 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak"); 2527 2528 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag)); 2529 if (old_next == next) { 2530 oops_do_log_change("oops_do, mark strong request"); 2531 } 2532 return old_next; 2533 } 2534 2535 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) { 2536 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 2537 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done"); 2538 2539 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag)); 2540 if (old_next == next) { 2541 oops_do_log_change("oops_do, mark weak done -> mark strong done"); 2542 return true; 2543 } 2544 return false; 2545 } 2546 2547 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() { 2548 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 2549 2550 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag || 2551 extract_state(_oops_do_mark_link) == claim_strong_request_tag, 2552 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 2553 2554 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 2555 // Self-loop if needed. 2556 if (old_head == nullptr) { 2557 old_head = this; 2558 } 2559 // Try to install end of list and weak done tag. 2560 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)) { 2561 oops_do_log_change("oops_do, mark weak done"); 2562 return nullptr; 2563 } else { 2564 return old_head; 2565 } 2566 } 2567 2568 void nmethod::oops_do_add_to_list_as_strong_done() { 2569 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 2570 2571 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 2572 // Self-loop if needed. 2573 if (old_head == nullptr) { 2574 old_head = this; 2575 } 2576 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u", 2577 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 2578 2579 oops_do_set_strong_done(old_head); 2580 } 2581 2582 void nmethod::oops_do_process_weak(OopsDoProcessor* p) { 2583 if (!oops_do_try_claim_weak_request()) { 2584 // Failed to claim for weak processing. 2585 oops_do_log_change("oops_do, mark weak request fail"); 2586 return; 2587 } 2588 2589 p->do_regular_processing(this); 2590 2591 nmethod* old_head = oops_do_try_add_to_list_as_weak_done(); 2592 if (old_head == nullptr) { 2593 return; 2594 } 2595 oops_do_log_change("oops_do, mark weak done fail"); 2596 // Adding to global list failed, another thread added a strong request. 2597 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag, 2598 "must be but is %u", extract_state(_oops_do_mark_link)); 2599 2600 oops_do_log_change("oops_do, mark weak request -> mark strong done"); 2601 2602 oops_do_set_strong_done(old_head); 2603 // Do missing strong processing. 2604 p->do_remaining_strong_processing(this); 2605 } 2606 2607 void nmethod::oops_do_process_strong(OopsDoProcessor* p) { 2608 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done(); 2609 if (next_raw == nullptr) { 2610 p->do_regular_processing(this); 2611 oops_do_add_to_list_as_strong_done(); 2612 return; 2613 } 2614 // Claim failed. Figure out why and handle it. 2615 if (oops_do_has_weak_request(next_raw)) { 2616 oops_do_mark_link* old = next_raw; 2617 // Claim failed because being weak processed (state == "weak request"). 2618 // Try to request deferred strong processing. 2619 next_raw = oops_do_try_add_strong_request(old); 2620 if (next_raw == old) { 2621 // Successfully requested deferred strong processing. 2622 return; 2623 } 2624 // Failed because of a concurrent transition. No longer in "weak request" state. 2625 } 2626 if (oops_do_has_any_strong_state(next_raw)) { 2627 // Already claimed for strong processing or requested for such. 2628 return; 2629 } 2630 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) { 2631 // Successfully claimed "weak done" as "strong done". Do the missing marking. 2632 p->do_remaining_strong_processing(this); 2633 return; 2634 } 2635 // Claim failed, some other thread got it. 2636 } 2637 2638 void nmethod::oops_do_marking_prologue() { 2639 assert_at_safepoint(); 2640 2641 log_trace(gc, nmethod)("oops_do_marking_prologue"); 2642 assert(_oops_do_mark_nmethods == nullptr, "must be empty"); 2643 } 2644 2645 void nmethod::oops_do_marking_epilogue() { 2646 assert_at_safepoint(); 2647 2648 nmethod* next = _oops_do_mark_nmethods; 2649 _oops_do_mark_nmethods = nullptr; 2650 if (next != nullptr) { 2651 nmethod* cur; 2652 do { 2653 cur = next; 2654 next = extract_nmethod(cur->_oops_do_mark_link); 2655 cur->_oops_do_mark_link = nullptr; 2656 DEBUG_ONLY(cur->verify_oop_relocations()); 2657 2658 LogTarget(Trace, gc, nmethod) lt; 2659 if (lt.is_enabled()) { 2660 LogStream ls(lt); 2661 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 2662 } 2663 // End if self-loop has been detected. 2664 } while (cur != next); 2665 } 2666 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 2667 } 2668 2669 inline bool includes(void* p, void* from, void* to) { 2670 return from <= p && p < to; 2671 } 2672 2673 2674 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2675 assert(count >= 2, "must be sentinel values, at least"); 2676 2677 #ifdef ASSERT 2678 // must be sorted and unique; we do a binary search in find_pc_desc() 2679 int prev_offset = pcs[0].pc_offset(); 2680 assert(prev_offset == PcDesc::lower_offset_limit, 2681 "must start with a sentinel"); 2682 for (int i = 1; i < count; i++) { 2683 int this_offset = pcs[i].pc_offset(); 2684 assert(this_offset > prev_offset, "offsets must be sorted"); 2685 prev_offset = this_offset; 2686 } 2687 assert(prev_offset == PcDesc::upper_offset_limit, 2688 "must end with a sentinel"); 2689 #endif //ASSERT 2690 2691 // Search for MethodHandle invokes and tag the nmethod. 2692 for (int i = 0; i < count; i++) { 2693 if (pcs[i].is_method_handle_invoke()) { 2694 set_has_method_handle_invokes(true); 2695 break; 2696 } 2697 } 2698 assert(has_method_handle_invokes() == (_deopt_mh_handler_offset != -1), "must have deopt mh handler"); 2699 2700 int size = count * sizeof(PcDesc); 2701 assert(scopes_pcs_size() >= size, "oob"); 2702 memcpy(scopes_pcs_begin(), pcs, size); 2703 2704 // Adjust the final sentinel downward. 2705 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2706 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2707 last_pc->set_pc_offset(content_size() + 1); 2708 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2709 // Fill any rounding gaps with copies of the last record. 2710 last_pc[1] = last_pc[0]; 2711 } 2712 // The following assert could fail if sizeof(PcDesc) is not 2713 // an integral multiple of oopSize (the rounding term). 2714 // If it fails, change the logic to always allocate a multiple 2715 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2716 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2717 } 2718 2719 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2720 assert(scopes_data_size() >= size, "oob"); 2721 memcpy(scopes_data_begin(), buffer, size); 2722 } 2723 2724 #ifdef ASSERT 2725 static PcDesc* linear_search(int pc_offset, bool approximate, PcDesc* lower, PcDesc* upper) { 2726 PcDesc* res = nullptr; 2727 assert(lower != nullptr && lower->pc_offset() == PcDesc::lower_offset_limit, 2728 "must start with a sentinel"); 2729 // lower + 1 to exclude initial sentinel 2730 for (PcDesc* p = lower + 1; p < upper; p++) { 2731 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2732 if (match_desc(p, pc_offset, approximate)) { 2733 if (res == nullptr) { 2734 res = p; 2735 } else { 2736 res = (PcDesc*) badAddress; 2737 } 2738 } 2739 } 2740 return res; 2741 } 2742 #endif 2743 2744 2745 #ifndef PRODUCT 2746 // Version of method to collect statistic 2747 PcDesc* PcDescContainer::find_pc_desc(address pc, bool approximate, address code_begin, 2748 PcDesc* lower, PcDesc* upper) { 2749 ++pc_nmethod_stats.pc_desc_queries; 2750 if (approximate) ++pc_nmethod_stats.pc_desc_approx; 2751 2752 PcDesc* desc = _pc_desc_cache.last_pc_desc(); 2753 assert(desc != nullptr, "PcDesc cache should be initialized already"); 2754 if (desc->pc_offset() == (pc - code_begin)) { 2755 // Cached value matched 2756 ++pc_nmethod_stats.pc_desc_tests; 2757 ++pc_nmethod_stats.pc_desc_repeats; 2758 return desc; 2759 } 2760 return find_pc_desc_internal(pc, approximate, code_begin, lower, upper); 2761 } 2762 #endif 2763 2764 // Finds a PcDesc with real-pc equal to "pc" 2765 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, address code_begin, 2766 PcDesc* lower_incl, PcDesc* upper_incl) { 2767 if ((pc < code_begin) || 2768 (pc - code_begin) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2769 return nullptr; // PC is wildly out of range 2770 } 2771 int pc_offset = (int) (pc - code_begin); 2772 2773 // Check the PcDesc cache if it contains the desired PcDesc 2774 // (This as an almost 100% hit rate.) 2775 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2776 if (res != nullptr) { 2777 assert(res == linear_search(pc_offset, approximate, lower_incl, upper_incl), "cache ok"); 2778 return res; 2779 } 2780 2781 // Fallback algorithm: quasi-linear search for the PcDesc 2782 // Find the last pc_offset less than the given offset. 2783 // The successor must be the required match, if there is a match at all. 2784 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2785 PcDesc* lower = lower_incl; // this is initial sentinel 2786 PcDesc* upper = upper_incl - 1; // exclude final sentinel 2787 if (lower >= upper) return nullptr; // no PcDescs at all 2788 2789 #define assert_LU_OK \ 2790 /* invariant on lower..upper during the following search: */ \ 2791 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2792 assert(upper->pc_offset() >= pc_offset, "sanity") 2793 assert_LU_OK; 2794 2795 // Use the last successful return as a split point. 2796 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2797 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2798 if (mid->pc_offset() < pc_offset) { 2799 lower = mid; 2800 } else { 2801 upper = mid; 2802 } 2803 2804 // Take giant steps at first (4096, then 256, then 16, then 1) 2805 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2806 const int RADIX = (1 << LOG2_RADIX); 2807 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2808 while ((mid = lower + step) < upper) { 2809 assert_LU_OK; 2810 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2811 if (mid->pc_offset() < pc_offset) { 2812 lower = mid; 2813 } else { 2814 upper = mid; 2815 break; 2816 } 2817 } 2818 assert_LU_OK; 2819 } 2820 2821 // Sneak up on the value with a linear search of length ~16. 2822 while (true) { 2823 assert_LU_OK; 2824 mid = lower + 1; 2825 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2826 if (mid->pc_offset() < pc_offset) { 2827 lower = mid; 2828 } else { 2829 upper = mid; 2830 break; 2831 } 2832 } 2833 #undef assert_LU_OK 2834 2835 if (match_desc(upper, pc_offset, approximate)) { 2836 assert(upper == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch"); 2837 if (!Thread::current_in_asgct()) { 2838 // we don't want to modify the cache if we're in ASGCT 2839 // which is typically called in a signal handler 2840 _pc_desc_cache.add_pc_desc(upper); 2841 } 2842 return upper; 2843 } else { 2844 assert(nullptr == linear_search(pc_offset, approximate, lower_incl, upper_incl), "search mismatch"); 2845 return nullptr; 2846 } 2847 } 2848 2849 bool nmethod::check_dependency_on(DepChange& changes) { 2850 // What has happened: 2851 // 1) a new class dependee has been added 2852 // 2) dependee and all its super classes have been marked 2853 bool found_check = false; // set true if we are upset 2854 for (Dependencies::DepStream deps(this); deps.next(); ) { 2855 // Evaluate only relevant dependencies. 2856 if (deps.spot_check_dependency_at(changes) != nullptr) { 2857 found_check = true; 2858 NOT_DEBUG(break); 2859 } 2860 } 2861 return found_check; 2862 } 2863 2864 // Called from mark_for_deoptimization, when dependee is invalidated. 2865 bool nmethod::is_dependent_on_method(Method* dependee) { 2866 for (Dependencies::DepStream deps(this); deps.next(); ) { 2867 if (deps.type() != Dependencies::evol_method) 2868 continue; 2869 Method* method = deps.method_argument(0); 2870 if (method == dependee) return true; 2871 } 2872 return false; 2873 } 2874 2875 void nmethod_init() { 2876 // make sure you didn't forget to adjust the filler fields 2877 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2878 } 2879 2880 // ----------------------------------------------------------------------------- 2881 // Verification 2882 2883 class VerifyOopsClosure: public OopClosure { 2884 nmethod* _nm; 2885 bool _ok; 2886 public: 2887 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2888 bool ok() { return _ok; } 2889 virtual void do_oop(oop* p) { 2890 if (oopDesc::is_oop_or_null(*p)) return; 2891 // Print diagnostic information before calling print_nmethod(). 2892 // Assertions therein might prevent call from returning. 2893 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2894 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2895 if (_ok) { 2896 _nm->print_nmethod(true); 2897 _ok = false; 2898 } 2899 } 2900 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2901 }; 2902 2903 class VerifyMetadataClosure: public MetadataClosure { 2904 public: 2905 void do_metadata(Metadata* md) { 2906 if (md->is_method()) { 2907 Method* method = (Method*)md; 2908 assert(!method->is_old(), "Should not be installing old methods"); 2909 } 2910 } 2911 }; 2912 2913 2914 void nmethod::verify() { 2915 if (is_not_entrant()) 2916 return; 2917 2918 // Make sure all the entry points are correctly aligned for patching. 2919 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2920 2921 // assert(oopDesc::is_oop(method()), "must be valid"); 2922 2923 ResourceMark rm; 2924 2925 if (!CodeCache::contains(this)) { 2926 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2927 } 2928 2929 if(is_native_method() ) 2930 return; 2931 2932 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2933 if (nm != this) { 2934 fatal("find_nmethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2935 } 2936 2937 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2938 if (! p->verify(this)) { 2939 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2940 } 2941 } 2942 2943 #ifdef ASSERT 2944 #if INCLUDE_JVMCI 2945 { 2946 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap 2947 ImmutableOopMapSet* oms = oop_maps(); 2948 ImplicitExceptionTable implicit_table(this); 2949 for (uint i = 0; i < implicit_table.len(); i++) { 2950 int exec_offset = (int) implicit_table.get_exec_offset(i); 2951 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) { 2952 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc"); 2953 bool found = false; 2954 for (int i = 0, imax = oms->count(); i < imax; i++) { 2955 if (oms->pair_at(i)->pc_offset() == exec_offset) { 2956 found = true; 2957 break; 2958 } 2959 } 2960 assert(found, "missing oopmap"); 2961 } 2962 } 2963 } 2964 #endif 2965 #endif 2966 2967 VerifyOopsClosure voc(this); 2968 oops_do(&voc); 2969 assert(voc.ok(), "embedded oops must be OK"); 2970 Universe::heap()->verify_nmethod(this); 2971 2972 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT, 2973 nm->method()->external_name(), p2i(_oops_do_mark_link)); 2974 verify_scopes(); 2975 2976 CompiledICLocker nm_verify(this); 2977 VerifyMetadataClosure vmc; 2978 metadata_do(&vmc); 2979 } 2980 2981 2982 void nmethod::verify_interrupt_point(address call_site, bool is_inline_cache) { 2983 2984 // Verify IC only when nmethod installation is finished. 2985 if (!is_not_installed()) { 2986 if (CompiledICLocker::is_safe(this)) { 2987 if (is_inline_cache) { 2988 CompiledIC_at(this, call_site); 2989 } else { 2990 CompiledDirectCall::at(call_site); 2991 } 2992 } else { 2993 CompiledICLocker ml_verify(this); 2994 if (is_inline_cache) { 2995 CompiledIC_at(this, call_site); 2996 } else { 2997 CompiledDirectCall::at(call_site); 2998 } 2999 } 3000 } 3001 3002 HandleMark hm(Thread::current()); 3003 3004 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 3005 assert(pd != nullptr, "PcDesc must exist"); 3006 for (ScopeDesc* sd = new ScopeDesc(this, pd); 3007 !sd->is_top(); sd = sd->sender()) { 3008 sd->verify(); 3009 } 3010 } 3011 3012 void nmethod::verify_scopes() { 3013 if( !method() ) return; // Runtime stubs have no scope 3014 if (method()->is_native()) return; // Ignore stub methods. 3015 // iterate through all interrupt point 3016 // and verify the debug information is valid. 3017 RelocIterator iter(this); 3018 while (iter.next()) { 3019 address stub = nullptr; 3020 switch (iter.type()) { 3021 case relocInfo::virtual_call_type: 3022 verify_interrupt_point(iter.addr(), true /* is_inline_cache */); 3023 break; 3024 case relocInfo::opt_virtual_call_type: 3025 stub = iter.opt_virtual_call_reloc()->static_stub(); 3026 verify_interrupt_point(iter.addr(), false /* is_inline_cache */); 3027 break; 3028 case relocInfo::static_call_type: 3029 stub = iter.static_call_reloc()->static_stub(); 3030 verify_interrupt_point(iter.addr(), false /* is_inline_cache */); 3031 break; 3032 case relocInfo::runtime_call_type: 3033 case relocInfo::runtime_call_w_cp_type: { 3034 address destination = iter.reloc()->value(); 3035 // Right now there is no way to find out which entries support 3036 // an interrupt point. It would be nice if we had this 3037 // information in a table. 3038 break; 3039 } 3040 default: 3041 break; 3042 } 3043 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section"); 3044 } 3045 } 3046 3047 3048 // ----------------------------------------------------------------------------- 3049 // Printing operations 3050 3051 void nmethod::print() const { 3052 ttyLocker ttyl; // keep the following output all in one block 3053 print(tty); 3054 } 3055 3056 void nmethod::print(outputStream* st) const { 3057 ResourceMark rm; 3058 3059 st->print("Compiled method "); 3060 3061 if (is_compiled_by_c1()) { 3062 st->print("(c1) "); 3063 } else if (is_compiled_by_c2()) { 3064 st->print("(c2) "); 3065 } else if (is_compiled_by_jvmci()) { 3066 st->print("(JVMCI) "); 3067 } else { 3068 st->print("(n/a) "); 3069 } 3070 3071 print_on(st, nullptr); 3072 3073 if (WizardMode) { 3074 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 3075 st->print(" for method " INTPTR_FORMAT , p2i(method())); 3076 st->print(" { "); 3077 st->print_cr("%s ", state()); 3078 st->print_cr("}:"); 3079 } 3080 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3081 p2i(this), 3082 p2i(this) + size(), 3083 size()); 3084 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3085 p2i(relocation_begin()), 3086 p2i(relocation_end()), 3087 relocation_size()); 3088 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3089 p2i(consts_begin()), 3090 p2i(consts_end()), 3091 consts_size()); 3092 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3093 p2i(insts_begin()), 3094 p2i(insts_end()), 3095 insts_size()); 3096 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3097 p2i(stub_begin()), 3098 p2i(stub_end()), 3099 stub_size()); 3100 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3101 p2i(oops_begin()), 3102 p2i(oops_end()), 3103 oops_size()); 3104 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3105 p2i(metadata_begin()), 3106 p2i(metadata_end()), 3107 metadata_size()); 3108 #if INCLUDE_JVMCI 3109 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3110 p2i(jvmci_data_begin()), 3111 p2i(jvmci_data_end()), 3112 jvmci_data_size()); 3113 #endif 3114 if (immutable_data_size() > 0) st->print_cr(" immutable data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3115 p2i(immutable_data_begin()), 3116 p2i(immutable_data_end()), 3117 immutable_data_size()); 3118 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3119 p2i(dependencies_begin()), 3120 p2i(dependencies_end()), 3121 dependencies_size()); 3122 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3123 p2i(nul_chk_table_begin()), 3124 p2i(nul_chk_table_end()), 3125 nul_chk_table_size()); 3126 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3127 p2i(handler_table_begin()), 3128 p2i(handler_table_end()), 3129 handler_table_size()); 3130 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3131 p2i(scopes_pcs_begin()), 3132 p2i(scopes_pcs_end()), 3133 scopes_pcs_size()); 3134 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3135 p2i(scopes_data_begin()), 3136 p2i(scopes_data_end()), 3137 scopes_data_size()); 3138 #if INCLUDE_JVMCI 3139 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 3140 p2i(speculations_begin()), 3141 p2i(speculations_end()), 3142 speculations_size()); 3143 #endif 3144 } 3145 3146 void nmethod::print_code() { 3147 ResourceMark m; 3148 ttyLocker ttyl; 3149 // Call the specialized decode method of this class. 3150 decode(tty); 3151 } 3152 3153 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN 3154 3155 void nmethod::print_dependencies_on(outputStream* out) { 3156 ResourceMark rm; 3157 stringStream st; 3158 st.print_cr("Dependencies:"); 3159 for (Dependencies::DepStream deps(this); deps.next(); ) { 3160 deps.print_dependency(&st); 3161 InstanceKlass* ctxk = deps.context_type(); 3162 if (ctxk != nullptr) { 3163 if (ctxk->is_dependent_nmethod(this)) { 3164 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 3165 } 3166 } 3167 deps.log_dependency(); // put it into the xml log also 3168 } 3169 out->print_raw(st.as_string()); 3170 } 3171 #endif 3172 3173 #if defined(SUPPORT_DATA_STRUCTS) 3174 3175 // Print the oops from the underlying CodeBlob. 3176 void nmethod::print_oops(outputStream* st) { 3177 ResourceMark m; 3178 st->print("Oops:"); 3179 if (oops_begin() < oops_end()) { 3180 st->cr(); 3181 for (oop* p = oops_begin(); p < oops_end(); p++) { 3182 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false); 3183 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 3184 if (Universe::contains_non_oop_word(p)) { 3185 st->print_cr("NON_OOP"); 3186 continue; // skip non-oops 3187 } 3188 if (*p == nullptr) { 3189 st->print_cr("nullptr-oop"); 3190 continue; // skip non-oops 3191 } 3192 (*p)->print_value_on(st); 3193 st->cr(); 3194 } 3195 } else { 3196 st->print_cr(" <list empty>"); 3197 } 3198 } 3199 3200 // Print metadata pool. 3201 void nmethod::print_metadata(outputStream* st) { 3202 ResourceMark m; 3203 st->print("Metadata:"); 3204 if (metadata_begin() < metadata_end()) { 3205 st->cr(); 3206 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 3207 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false); 3208 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 3209 if (*p && *p != Universe::non_oop_word()) { 3210 (*p)->print_value_on(st); 3211 } 3212 st->cr(); 3213 } 3214 } else { 3215 st->print_cr(" <list empty>"); 3216 } 3217 } 3218 3219 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN 3220 void nmethod::print_scopes_on(outputStream* st) { 3221 // Find the first pc desc for all scopes in the code and print it. 3222 ResourceMark rm; 3223 st->print("scopes:"); 3224 if (scopes_pcs_begin() < scopes_pcs_end()) { 3225 st->cr(); 3226 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3227 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 3228 continue; 3229 3230 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 3231 while (sd != nullptr) { 3232 sd->print_on(st, p); // print output ends with a newline 3233 sd = sd->sender(); 3234 } 3235 } 3236 } else { 3237 st->print_cr(" <list empty>"); 3238 } 3239 } 3240 #endif 3241 3242 #ifndef PRODUCT // RelocIterator does support printing only then. 3243 void nmethod::print_relocations() { 3244 ResourceMark m; // in case methods get printed via the debugger 3245 tty->print_cr("relocations:"); 3246 RelocIterator iter(this); 3247 iter.print(); 3248 } 3249 #endif 3250 3251 void nmethod::print_pcs_on(outputStream* st) { 3252 ResourceMark m; // in case methods get printed via debugger 3253 st->print("pc-bytecode offsets:"); 3254 if (scopes_pcs_begin() < scopes_pcs_end()) { 3255 st->cr(); 3256 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3257 p->print_on(st, this); // print output ends with a newline 3258 } 3259 } else { 3260 st->print_cr(" <list empty>"); 3261 } 3262 } 3263 3264 void nmethod::print_handler_table() { 3265 ExceptionHandlerTable(this).print(code_begin()); 3266 } 3267 3268 void nmethod::print_nul_chk_table() { 3269 ImplicitExceptionTable(this).print(code_begin()); 3270 } 3271 3272 void nmethod::print_recorded_oop(int log_n, int i) { 3273 void* value; 3274 3275 if (i == 0) { 3276 value = nullptr; 3277 } else { 3278 // Be careful around non-oop words. Don't create an oop 3279 // with that value, or it will assert in verification code. 3280 if (Universe::contains_non_oop_word(oop_addr_at(i))) { 3281 value = Universe::non_oop_word(); 3282 } else { 3283 value = oop_at(i); 3284 } 3285 } 3286 3287 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value)); 3288 3289 if (value == Universe::non_oop_word()) { 3290 tty->print("non-oop word"); 3291 } else { 3292 if (value == nullptr) { 3293 tty->print("nullptr-oop"); 3294 } else { 3295 oop_at(i)->print_value_on(tty); 3296 } 3297 } 3298 3299 tty->cr(); 3300 } 3301 3302 void nmethod::print_recorded_oops() { 3303 const int n = oops_count(); 3304 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 3305 tty->print("Recorded oops:"); 3306 if (n > 0) { 3307 tty->cr(); 3308 for (int i = 0; i < n; i++) { 3309 print_recorded_oop(log_n, i); 3310 } 3311 } else { 3312 tty->print_cr(" <list empty>"); 3313 } 3314 } 3315 3316 void nmethod::print_recorded_metadata() { 3317 const int n = metadata_count(); 3318 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 3319 tty->print("Recorded metadata:"); 3320 if (n > 0) { 3321 tty->cr(); 3322 for (int i = 0; i < n; i++) { 3323 Metadata* m = metadata_at(i); 3324 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m)); 3325 if (m == (Metadata*)Universe::non_oop_word()) { 3326 tty->print("non-metadata word"); 3327 } else if (m == nullptr) { 3328 tty->print("nullptr-oop"); 3329 } else { 3330 Metadata::print_value_on_maybe_null(tty, m); 3331 } 3332 tty->cr(); 3333 } 3334 } else { 3335 tty->print_cr(" <list empty>"); 3336 } 3337 } 3338 #endif 3339 3340 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 3341 3342 void nmethod::print_constant_pool(outputStream* st) { 3343 //----------------------------------- 3344 //---< Print the constant pool >--- 3345 //----------------------------------- 3346 int consts_size = this->consts_size(); 3347 if ( consts_size > 0 ) { 3348 unsigned char* cstart = this->consts_begin(); 3349 unsigned char* cp = cstart; 3350 unsigned char* cend = cp + consts_size; 3351 unsigned int bytes_per_line = 4; 3352 unsigned int CP_alignment = 8; 3353 unsigned int n; 3354 3355 st->cr(); 3356 3357 //---< print CP header to make clear what's printed >--- 3358 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) { 3359 n = bytes_per_line; 3360 st->print_cr("[Constant Pool]"); 3361 Disassembler::print_location(cp, cstart, cend, st, true, true); 3362 Disassembler::print_hexdata(cp, n, st, true); 3363 st->cr(); 3364 } else { 3365 n = (int)((uintptr_t)cp & (bytes_per_line-1)); 3366 st->print_cr("[Constant Pool (unaligned)]"); 3367 } 3368 3369 //---< print CP contents, bytes_per_line at a time >--- 3370 while (cp < cend) { 3371 Disassembler::print_location(cp, cstart, cend, st, true, false); 3372 Disassembler::print_hexdata(cp, n, st, false); 3373 cp += n; 3374 n = bytes_per_line; 3375 st->cr(); 3376 } 3377 3378 //---< Show potential alignment gap between constant pool and code >--- 3379 cend = code_begin(); 3380 if( cp < cend ) { 3381 n = 4; 3382 st->print_cr("[Code entry alignment]"); 3383 while (cp < cend) { 3384 Disassembler::print_location(cp, cstart, cend, st, false, false); 3385 cp += n; 3386 st->cr(); 3387 } 3388 } 3389 } else { 3390 st->print_cr("[Constant Pool (empty)]"); 3391 } 3392 st->cr(); 3393 } 3394 3395 #endif 3396 3397 // Disassemble this nmethod. 3398 // Print additional debug information, if requested. This could be code 3399 // comments, block comments, profiling counters, etc. 3400 // The undisassembled format is useful no disassembler library is available. 3401 // The resulting hex dump (with markers) can be disassembled later, or on 3402 // another system, when/where a disassembler library is available. 3403 void nmethod::decode2(outputStream* ost) const { 3404 3405 // Called from frame::back_trace_with_decode without ResourceMark. 3406 ResourceMark rm; 3407 3408 // Make sure we have a valid stream to print on. 3409 outputStream* st = ost ? ost : tty; 3410 3411 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY) 3412 const bool use_compressed_format = true; 3413 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 3414 AbstractDisassembler::show_block_comment()); 3415 #else 3416 const bool use_compressed_format = Disassembler::is_abstract(); 3417 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 3418 AbstractDisassembler::show_block_comment()); 3419 #endif 3420 3421 st->cr(); 3422 this->print(st); 3423 st->cr(); 3424 3425 #if defined(SUPPORT_ASSEMBLY) 3426 //---------------------------------- 3427 //---< Print real disassembly >--- 3428 //---------------------------------- 3429 if (! use_compressed_format) { 3430 st->print_cr("[Disassembly]"); 3431 Disassembler::decode(const_cast<nmethod*>(this), st); 3432 st->bol(); 3433 st->print_cr("[/Disassembly]"); 3434 return; 3435 } 3436 #endif 3437 3438 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 3439 3440 // Compressed undisassembled disassembly format. 3441 // The following status values are defined/supported: 3442 // = 0 - currently at bol() position, nothing printed yet on current line. 3443 // = 1 - currently at position after print_location(). 3444 // > 1 - in the midst of printing instruction stream bytes. 3445 int compressed_format_idx = 0; 3446 int code_comment_column = 0; 3447 const int instr_maxlen = Assembler::instr_maxlen(); 3448 const uint tabspacing = 8; 3449 unsigned char* start = this->code_begin(); 3450 unsigned char* p = this->code_begin(); 3451 unsigned char* end = this->code_end(); 3452 unsigned char* pss = p; // start of a code section (used for offsets) 3453 3454 if ((start == nullptr) || (end == nullptr)) { 3455 st->print_cr("PrintAssembly not possible due to uninitialized section pointers"); 3456 return; 3457 } 3458 #endif 3459 3460 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 3461 //---< plain abstract disassembly, no comments or anything, just section headers >--- 3462 if (use_compressed_format && ! compressed_with_comments) { 3463 const_cast<nmethod*>(this)->print_constant_pool(st); 3464 3465 //---< Open the output (Marker for post-mortem disassembler) >--- 3466 st->print_cr("[MachCode]"); 3467 const char* header = nullptr; 3468 address p0 = p; 3469 while (p < end) { 3470 address pp = p; 3471 while ((p < end) && (header == nullptr)) { 3472 header = nmethod_section_label(p); 3473 pp = p; 3474 p += Assembler::instr_len(p); 3475 } 3476 if (pp > p0) { 3477 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen()); 3478 p0 = pp; 3479 p = pp; 3480 header = nullptr; 3481 } else if (header != nullptr) { 3482 st->bol(); 3483 st->print_cr("%s", header); 3484 header = nullptr; 3485 } 3486 } 3487 //---< Close the output (Marker for post-mortem disassembler) >--- 3488 st->bol(); 3489 st->print_cr("[/MachCode]"); 3490 return; 3491 } 3492 #endif 3493 3494 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 3495 //---< abstract disassembly with comments and section headers merged in >--- 3496 if (compressed_with_comments) { 3497 const_cast<nmethod*>(this)->print_constant_pool(st); 3498 3499 //---< Open the output (Marker for post-mortem disassembler) >--- 3500 st->print_cr("[MachCode]"); 3501 while ((p < end) && (p != nullptr)) { 3502 const int instruction_size_in_bytes = Assembler::instr_len(p); 3503 3504 //---< Block comments for nmethod. Interrupts instruction stream, if any. >--- 3505 // Outputs a bol() before and a cr() after, but only if a comment is printed. 3506 // Prints nmethod_section_label as well. 3507 if (AbstractDisassembler::show_block_comment()) { 3508 print_block_comment(st, p); 3509 if (st->position() == 0) { 3510 compressed_format_idx = 0; 3511 } 3512 } 3513 3514 //---< New location information after line break >--- 3515 if (compressed_format_idx == 0) { 3516 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 3517 compressed_format_idx = 1; 3518 } 3519 3520 //---< Code comment for current instruction. Address range [p..(p+len)) >--- 3521 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes; 3522 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end 3523 3524 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) { 3525 //---< interrupt instruction byte stream for code comment >--- 3526 if (compressed_format_idx > 1) { 3527 st->cr(); // interrupt byte stream 3528 st->cr(); // add an empty line 3529 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 3530 } 3531 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end ); 3532 st->bol(); 3533 compressed_format_idx = 0; 3534 } 3535 3536 //---< New location information after line break >--- 3537 if (compressed_format_idx == 0) { 3538 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 3539 compressed_format_idx = 1; 3540 } 3541 3542 //---< Nicely align instructions for readability >--- 3543 if (compressed_format_idx > 1) { 3544 Disassembler::print_delimiter(st); 3545 } 3546 3547 //---< Now, finally, print the actual instruction bytes >--- 3548 unsigned char* p0 = p; 3549 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen); 3550 compressed_format_idx += (int)(p - p0); 3551 3552 if (Disassembler::start_newline(compressed_format_idx-1)) { 3553 st->cr(); 3554 compressed_format_idx = 0; 3555 } 3556 } 3557 //---< Close the output (Marker for post-mortem disassembler) >--- 3558 st->bol(); 3559 st->print_cr("[/MachCode]"); 3560 return; 3561 } 3562 #endif 3563 } 3564 3565 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 3566 3567 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3568 RelocIterator iter(this, begin, end); 3569 bool have_one = false; 3570 while (iter.next()) { 3571 have_one = true; 3572 switch (iter.type()) { 3573 case relocInfo::none: return "no_reloc"; 3574 case relocInfo::oop_type: { 3575 // Get a non-resizable resource-allocated stringStream. 3576 // Our callees make use of (nested) ResourceMarks. 3577 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024); 3578 oop_Relocation* r = iter.oop_reloc(); 3579 oop obj = r->oop_value(); 3580 st.print("oop("); 3581 if (obj == nullptr) st.print("nullptr"); 3582 else obj->print_value_on(&st); 3583 st.print(")"); 3584 return st.as_string(); 3585 } 3586 case relocInfo::metadata_type: { 3587 stringStream st; 3588 metadata_Relocation* r = iter.metadata_reloc(); 3589 Metadata* obj = r->metadata_value(); 3590 st.print("metadata("); 3591 if (obj == nullptr) st.print("nullptr"); 3592 else obj->print_value_on(&st); 3593 st.print(")"); 3594 return st.as_string(); 3595 } 3596 case relocInfo::runtime_call_type: 3597 case relocInfo::runtime_call_w_cp_type: { 3598 stringStream st; 3599 st.print("runtime_call"); 3600 CallRelocation* r = (CallRelocation*)iter.reloc(); 3601 address dest = r->destination(); 3602 CodeBlob* cb = CodeCache::find_blob(dest); 3603 if (cb != nullptr) { 3604 st.print(" %s", cb->name()); 3605 } else { 3606 ResourceMark rm; 3607 const int buflen = 1024; 3608 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 3609 int offset; 3610 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 3611 st.print(" %s", buf); 3612 if (offset != 0) { 3613 st.print("+%d", offset); 3614 } 3615 } 3616 } 3617 return st.as_string(); 3618 } 3619 case relocInfo::virtual_call_type: { 3620 stringStream st; 3621 st.print_raw("virtual_call"); 3622 virtual_call_Relocation* r = iter.virtual_call_reloc(); 3623 Method* m = r->method_value(); 3624 if (m != nullptr) { 3625 assert(m->is_method(), ""); 3626 m->print_short_name(&st); 3627 } 3628 return st.as_string(); 3629 } 3630 case relocInfo::opt_virtual_call_type: { 3631 stringStream st; 3632 st.print_raw("optimized virtual_call"); 3633 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 3634 Method* m = r->method_value(); 3635 if (m != nullptr) { 3636 assert(m->is_method(), ""); 3637 m->print_short_name(&st); 3638 } 3639 return st.as_string(); 3640 } 3641 case relocInfo::static_call_type: { 3642 stringStream st; 3643 st.print_raw("static_call"); 3644 static_call_Relocation* r = iter.static_call_reloc(); 3645 Method* m = r->method_value(); 3646 if (m != nullptr) { 3647 assert(m->is_method(), ""); 3648 m->print_short_name(&st); 3649 } 3650 return st.as_string(); 3651 } 3652 case relocInfo::static_stub_type: return "static_stub"; 3653 case relocInfo::external_word_type: return "external_word"; 3654 case relocInfo::internal_word_type: return "internal_word"; 3655 case relocInfo::section_word_type: return "section_word"; 3656 case relocInfo::poll_type: return "poll"; 3657 case relocInfo::poll_return_type: return "poll_return"; 3658 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 3659 case relocInfo::entry_guard_type: return "entry_guard"; 3660 case relocInfo::post_call_nop_type: return "post_call_nop"; 3661 case relocInfo::barrier_type: { 3662 barrier_Relocation* const reloc = iter.barrier_reloc(); 3663 stringStream st; 3664 st.print("barrier format=%d", reloc->format()); 3665 return st.as_string(); 3666 } 3667 3668 case relocInfo::type_mask: return "type_bit_mask"; 3669 3670 default: { 3671 stringStream st; 3672 st.print("unknown relocInfo=%d", (int) iter.type()); 3673 return st.as_string(); 3674 } 3675 } 3676 } 3677 return have_one ? "other" : nullptr; 3678 } 3679 3680 // Return the last scope in (begin..end] 3681 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3682 PcDesc* p = pc_desc_near(begin+1); 3683 if (p != nullptr && p->real_pc(this) <= end) { 3684 return new ScopeDesc(this, p); 3685 } 3686 return nullptr; 3687 } 3688 3689 const char* nmethod::nmethod_section_label(address pos) const { 3690 const char* label = nullptr; 3691 if (pos == code_begin()) label = "[Instructions begin]"; 3692 if (pos == entry_point()) label = "[Entry Point]"; 3693 if (pos == inline_entry_point()) label = "[Inline Entry Point]"; 3694 if (pos == verified_entry_point()) label = "[Verified Entry Point]"; 3695 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]"; 3696 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]"; 3697 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]"; 3698 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]"; 3699 // Check stub_code before checking exception_handler or deopt_handler. 3700 if (pos == this->stub_begin()) label = "[Stub Code]"; 3701 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]"; 3702 if (JVMCI_ONLY(_deopt_handler_offset != -1 &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]"; 3703 return label; 3704 } 3705 3706 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) { 3707 if (pos == entry) { 3708 stream->bol(); 3709 stream->print_cr("%s", label); 3710 return 1; 3711 } else { 3712 return 0; 3713 } 3714 } 3715 3716 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const { 3717 if (print_section_labels) { 3718 int n = 0; 3719 // Multiple entry points may be at the same position. Print them all. 3720 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]"); 3721 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]"); 3722 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]"); 3723 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]"); 3724 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]"); 3725 if (n == 0) { 3726 const char* label = nmethod_section_label(block_begin); 3727 if (label != nullptr) { 3728 stream->bol(); 3729 stream->print_cr("%s", label); 3730 } 3731 } 3732 } 3733 3734 Method* m = method(); 3735 if (m == nullptr || is_osr_method()) { 3736 return; 3737 } 3738 3739 // Print the name of the method (only once) 3740 address low = MIN4(entry_point(), verified_entry_point(), verified_inline_entry_point(), verified_inline_ro_entry_point()); 3741 low = MIN2(low, inline_entry_point()); 3742 assert(low != 0, "sanity"); 3743 if (block_begin == low) { 3744 stream->print(" # "); 3745 m->print_value_on(stream); 3746 stream->cr(); 3747 } 3748 3749 // Print the arguments for the 3 types of verified entry points 3750 CompiledEntrySignature ces(m); 3751 ces.compute_calling_conventions(false); 3752 const GrowableArray<SigEntry>* sig_cc; 3753 const VMRegPair* regs; 3754 if (block_begin == verified_entry_point()) { 3755 sig_cc = ces.sig_cc(); 3756 regs = ces.regs_cc(); 3757 } else if (block_begin == verified_inline_entry_point()) { 3758 sig_cc = ces.sig(); 3759 regs = ces.regs(); 3760 } else if (block_begin == verified_inline_ro_entry_point()) { 3761 sig_cc = ces.sig_cc_ro(); 3762 regs = ces.regs_cc_ro(); 3763 } else { 3764 return; 3765 } 3766 3767 bool has_this = !m->is_static(); 3768 if (ces.has_inline_recv() && block_begin == verified_entry_point()) { 3769 // <this> argument is scalarized for verified_entry_point() 3770 has_this = false; 3771 } 3772 const char* spname = "sp"; // make arch-specific? 3773 int stack_slot_offset = this->frame_size() * wordSize; 3774 int tab1 = 14, tab2 = 24; 3775 int sig_index = 0; 3776 int arg_index = has_this ? -1 : 0; 3777 bool did_old_sp = false; 3778 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) { 3779 bool at_this = (arg_index == -1); 3780 bool at_old_sp = false; 3781 BasicType t = (*sig)._bt; 3782 if (at_this) { 3783 stream->print(" # this: "); 3784 } else { 3785 stream->print(" # parm%d: ", arg_index); 3786 } 3787 stream->move_to(tab1); 3788 VMReg fst = regs[sig_index].first(); 3789 VMReg snd = regs[sig_index].second(); 3790 if (fst->is_reg()) { 3791 stream->print("%s", fst->name()); 3792 if (snd->is_valid()) { 3793 stream->print(":%s", snd->name()); 3794 } 3795 } else if (fst->is_stack()) { 3796 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3797 if (offset == stack_slot_offset) at_old_sp = true; 3798 stream->print("[%s+0x%x]", spname, offset); 3799 } else { 3800 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3801 } 3802 stream->print(" "); 3803 stream->move_to(tab2); 3804 stream->print("= "); 3805 if (at_this) { 3806 m->method_holder()->print_value_on(stream); 3807 } else { 3808 bool did_name = false; 3809 if (is_reference_type(t)) { 3810 Symbol* name = (*sig)._symbol; 3811 name->print_value_on(stream); 3812 did_name = true; 3813 } 3814 if (!did_name) 3815 stream->print("%s", type2name(t)); 3816 // If the entry has a non-default sort_offset, it must be a null marker 3817 if ((*sig)._sort_offset != (*sig)._offset) { 3818 stream->print(" (null marker)"); 3819 } 3820 } 3821 if (at_old_sp) { 3822 stream->print(" (%s of caller)", spname); 3823 did_old_sp = true; 3824 } 3825 stream->cr(); 3826 sig_index += type2size[t]; 3827 arg_index += 1; 3828 } 3829 if (!did_old_sp) { 3830 stream->print(" # "); 3831 stream->move_to(tab1); 3832 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3833 stream->print(" (%s of caller)", spname); 3834 stream->cr(); 3835 } 3836 } 3837 3838 // Returns whether this nmethod has code comments. 3839 bool nmethod::has_code_comment(address begin, address end) { 3840 // scopes? 3841 ScopeDesc* sd = scope_desc_in(begin, end); 3842 if (sd != nullptr) return true; 3843 3844 // relocations? 3845 const char* str = reloc_string_for(begin, end); 3846 if (str != nullptr) return true; 3847 3848 // implicit exceptions? 3849 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin())); 3850 if (cont_offset != 0) return true; 3851 3852 return false; 3853 } 3854 3855 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) { 3856 ImplicitExceptionTable implicit_table(this); 3857 int pc_offset = (int)(begin - code_begin()); 3858 int cont_offset = implicit_table.continuation_offset(pc_offset); 3859 bool oop_map_required = false; 3860 if (cont_offset != 0) { 3861 st->move_to(column, 6, 0); 3862 if (pc_offset == cont_offset) { 3863 st->print("; implicit exception: deoptimizes"); 3864 oop_map_required = true; 3865 } else { 3866 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3867 } 3868 } 3869 3870 // Find an oopmap in (begin, end]. We use the odd half-closed 3871 // interval so that oop maps and scope descs which are tied to the 3872 // byte after a call are printed with the call itself. OopMaps 3873 // associated with implicit exceptions are printed with the implicit 3874 // instruction. 3875 address base = code_begin(); 3876 ImmutableOopMapSet* oms = oop_maps(); 3877 if (oms != nullptr) { 3878 for (int i = 0, imax = oms->count(); i < imax; i++) { 3879 const ImmutableOopMapPair* pair = oms->pair_at(i); 3880 const ImmutableOopMap* om = pair->get_from(oms); 3881 address pc = base + pair->pc_offset(); 3882 if (pc >= begin) { 3883 #if INCLUDE_JVMCI 3884 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset(); 3885 #else 3886 bool is_implicit_deopt = false; 3887 #endif 3888 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) { 3889 st->move_to(column, 6, 0); 3890 st->print("; "); 3891 om->print_on(st); 3892 oop_map_required = false; 3893 } 3894 } 3895 if (pc > end) { 3896 break; 3897 } 3898 } 3899 } 3900 assert(!oop_map_required, "missed oopmap"); 3901 3902 Thread* thread = Thread::current(); 3903 3904 // Print any debug info present at this pc. 3905 ScopeDesc* sd = scope_desc_in(begin, end); 3906 if (sd != nullptr) { 3907 st->move_to(column, 6, 0); 3908 if (sd->bci() == SynchronizationEntryBCI) { 3909 st->print(";*synchronization entry"); 3910 } else if (sd->bci() == AfterBci) { 3911 st->print(";* method exit (unlocked if synchronized)"); 3912 } else if (sd->bci() == UnwindBci) { 3913 st->print(";* unwind (locked if synchronized)"); 3914 } else if (sd->bci() == AfterExceptionBci) { 3915 st->print(";* unwind (unlocked if synchronized)"); 3916 } else if (sd->bci() == UnknownBci) { 3917 st->print(";* unknown"); 3918 } else if (sd->bci() == InvalidFrameStateBci) { 3919 st->print(";* invalid frame state"); 3920 } else { 3921 if (sd->method() == nullptr) { 3922 st->print("method is nullptr"); 3923 } else if (sd->method()->is_native()) { 3924 st->print("method is native"); 3925 } else { 3926 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3927 st->print(";*%s", Bytecodes::name(bc)); 3928 switch (bc) { 3929 case Bytecodes::_invokevirtual: 3930 case Bytecodes::_invokespecial: 3931 case Bytecodes::_invokestatic: 3932 case Bytecodes::_invokeinterface: 3933 { 3934 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci()); 3935 st->print(" "); 3936 if (invoke.name() != nullptr) 3937 invoke.name()->print_symbol_on(st); 3938 else 3939 st->print("<UNKNOWN>"); 3940 break; 3941 } 3942 case Bytecodes::_getfield: 3943 case Bytecodes::_putfield: 3944 case Bytecodes::_getstatic: 3945 case Bytecodes::_putstatic: 3946 { 3947 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci()); 3948 st->print(" "); 3949 if (field.name() != nullptr) 3950 field.name()->print_symbol_on(st); 3951 else 3952 st->print("<UNKNOWN>"); 3953 } 3954 default: 3955 break; 3956 } 3957 } 3958 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized()); 3959 } 3960 3961 // Print all scopes 3962 for (;sd != nullptr; sd = sd->sender()) { 3963 st->move_to(column, 6, 0); 3964 st->print("; -"); 3965 if (sd->should_reexecute()) { 3966 st->print(" (reexecute)"); 3967 } 3968 if (sd->method() == nullptr) { 3969 st->print("method is nullptr"); 3970 } else { 3971 sd->method()->print_short_name(st); 3972 } 3973 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3974 if (lineno != -1) { 3975 st->print("@%d (line %d)", sd->bci(), lineno); 3976 } else { 3977 st->print("@%d", sd->bci()); 3978 } 3979 st->cr(); 3980 } 3981 } 3982 3983 // Print relocation information 3984 // Prevent memory leak: allocating without ResourceMark. 3985 ResourceMark rm; 3986 const char* str = reloc_string_for(begin, end); 3987 if (str != nullptr) { 3988 if (sd != nullptr) st->cr(); 3989 st->move_to(column, 6, 0); 3990 st->print("; {%s}", str); 3991 } 3992 } 3993 3994 #endif 3995 3996 address nmethod::call_instruction_address(address pc) const { 3997 if (NativeCall::is_call_before(pc)) { 3998 NativeCall *ncall = nativeCall_before(pc); 3999 return ncall->instruction_address(); 4000 } 4001 return nullptr; 4002 } 4003 4004 #if defined(SUPPORT_DATA_STRUCTS) 4005 void nmethod::print_value_on(outputStream* st) const { 4006 st->print("nmethod"); 4007 print_on(st, nullptr); 4008 } 4009 #endif 4010 4011 #ifndef PRODUCT 4012 4013 void nmethod::print_calls(outputStream* st) { 4014 RelocIterator iter(this); 4015 while (iter.next()) { 4016 switch (iter.type()) { 4017 case relocInfo::virtual_call_type: { 4018 CompiledICLocker ml_verify(this); 4019 CompiledIC_at(&iter)->print(); 4020 break; 4021 } 4022 case relocInfo::static_call_type: 4023 case relocInfo::opt_virtual_call_type: 4024 st->print_cr("Direct call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 4025 CompiledDirectCall::at(iter.reloc())->print(); 4026 break; 4027 default: 4028 break; 4029 } 4030 } 4031 } 4032 4033 void nmethod::print_statistics() { 4034 ttyLocker ttyl; 4035 if (xtty != nullptr) xtty->head("statistics type='nmethod'"); 4036 native_nmethod_stats.print_native_nmethod_stats(); 4037 #ifdef COMPILER1 4038 c1_java_nmethod_stats.print_nmethod_stats("C1"); 4039 #endif 4040 #ifdef COMPILER2 4041 c2_java_nmethod_stats.print_nmethod_stats("C2"); 4042 #endif 4043 #if INCLUDE_JVMCI 4044 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 4045 #endif 4046 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 4047 DebugInformationRecorder::print_statistics(); 4048 pc_nmethod_stats.print_pc_stats(); 4049 Dependencies::print_statistics(); 4050 ExternalsRecorder::print_statistics(); 4051 if (xtty != nullptr) xtty->tail("statistics"); 4052 } 4053 4054 #endif // !PRODUCT 4055 4056 #if INCLUDE_JVMCI 4057 void nmethod::update_speculation(JavaThread* thread) { 4058 jlong speculation = thread->pending_failed_speculation(); 4059 if (speculation != 0) { 4060 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list"); 4061 jvmci_nmethod_data()->add_failed_speculation(this, speculation); 4062 thread->set_pending_failed_speculation(0); 4063 } 4064 } 4065 4066 const char* nmethod::jvmci_name() { 4067 if (jvmci_nmethod_data() != nullptr) { 4068 return jvmci_nmethod_data()->name(); 4069 } 4070 return nullptr; 4071 } 4072 #endif