1 /* 2 * Copyright (c) 1997, 2023, 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/compiledMethod.inline.hpp" 30 #include "code/dependencies.hpp" 31 #include "code/nativeInst.hpp" 32 #include "code/nmethod.hpp" 33 #include "code/scopeDesc.hpp" 34 #include "compiler/abstractCompiler.hpp" 35 #include "compiler/compilationLog.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "compiler/compileLog.hpp" 38 #include "compiler/compileTask.hpp" 39 #include "compiler/compilerDirectives.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/collectedHeap.hpp" 46 #include "interpreter/bytecode.hpp" 47 #include "jvm.h" 48 #include "logging/log.hpp" 49 #include "logging/logStream.hpp" 50 #include "memory/allocation.inline.hpp" 51 #include "memory/resourceArea.hpp" 52 #include "memory/universe.hpp" 53 #include "oops/access.inline.hpp" 54 #include "oops/klass.inline.hpp" 55 #include "oops/method.inline.hpp" 56 #include "oops/methodData.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/weakHandle.inline.hpp" 59 #include "prims/jvmtiImpl.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "prims/methodHandles.hpp" 62 #include "runtime/continuation.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/deoptimization.hpp" 65 #include "runtime/flags/flagSetting.hpp" 66 #include "runtime/frame.inline.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/jniHandles.inline.hpp" 69 #include "runtime/orderAccess.hpp" 70 #include "runtime/os.hpp" 71 #include "runtime/safepointVerifiers.hpp" 72 #include "runtime/serviceThread.hpp" 73 #include "runtime/sharedRuntime.hpp" 74 #include "runtime/signature.hpp" 75 #include "runtime/threadWXSetters.inline.hpp" 76 #include "runtime/vmThread.hpp" 77 #include "utilities/align.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/dtrace.hpp" 80 #include "utilities/events.hpp" 81 #include "utilities/globalDefinitions.hpp" 82 #include "utilities/resourceHash.hpp" 83 #include "utilities/xmlstream.hpp" 84 #if INCLUDE_JVMCI 85 #include "jvmci/jvmciRuntime.hpp" 86 #endif 87 88 #ifdef DTRACE_ENABLED 89 90 // Only bother with this argument setup if dtrace is available 91 92 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 93 { \ 94 Method* m = (method); \ 95 if (m != nullptr) { \ 96 Symbol* klass_name = m->klass_name(); \ 97 Symbol* name = m->name(); \ 98 Symbol* signature = m->signature(); \ 99 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 100 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 101 (char *) name->bytes(), name->utf8_length(), \ 102 (char *) signature->bytes(), signature->utf8_length()); \ 103 } \ 104 } 105 106 #else // ndef DTRACE_ENABLED 107 108 #define DTRACE_METHOD_UNLOAD_PROBE(method) 109 110 #endif 111 112 //--------------------------------------------------------------------------------- 113 // NMethod statistics 114 // They are printed under various flags, including: 115 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 116 // (In the latter two cases, they like other stats are printed to the log only.) 117 118 #ifndef PRODUCT 119 // These variables are put into one block to reduce relocations 120 // and make it simpler to print from the debugger. 121 struct java_nmethod_stats_struct { 122 uint nmethod_count; 123 uint total_size; 124 uint relocation_size; 125 uint consts_size; 126 uint insts_size; 127 uint stub_size; 128 uint scopes_data_size; 129 uint scopes_pcs_size; 130 uint dependencies_size; 131 uint handler_table_size; 132 uint nul_chk_table_size; 133 #if INCLUDE_JVMCI 134 uint speculations_size; 135 uint jvmci_data_size; 136 #endif 137 uint oops_size; 138 uint metadata_size; 139 140 void note_nmethod(nmethod* nm) { 141 nmethod_count += 1; 142 total_size += nm->size(); 143 relocation_size += nm->relocation_size(); 144 consts_size += nm->consts_size(); 145 insts_size += nm->insts_size(); 146 stub_size += nm->stub_size(); 147 oops_size += nm->oops_size(); 148 metadata_size += nm->metadata_size(); 149 scopes_data_size += nm->scopes_data_size(); 150 scopes_pcs_size += nm->scopes_pcs_size(); 151 dependencies_size += nm->dependencies_size(); 152 handler_table_size += nm->handler_table_size(); 153 nul_chk_table_size += nm->nul_chk_table_size(); 154 #if INCLUDE_JVMCI 155 speculations_size += nm->speculations_size(); 156 jvmci_data_size += nm->jvmci_data_size(); 157 #endif 158 } 159 void print_nmethod_stats(const char* name) { 160 if (nmethod_count == 0) return; 161 tty->print_cr("Statistics for %u bytecoded nmethods for %s:", nmethod_count, name); 162 if (total_size != 0) tty->print_cr(" total in heap = %u", total_size); 163 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 164 if (relocation_size != 0) tty->print_cr(" relocation = %u", relocation_size); 165 if (consts_size != 0) tty->print_cr(" constants = %u", consts_size); 166 if (insts_size != 0) tty->print_cr(" main code = %u", insts_size); 167 if (stub_size != 0) tty->print_cr(" stub code = %u", stub_size); 168 if (oops_size != 0) tty->print_cr(" oops = %u", oops_size); 169 if (metadata_size != 0) tty->print_cr(" metadata = %u", metadata_size); 170 if (scopes_data_size != 0) tty->print_cr(" scopes data = %u", scopes_data_size); 171 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %u", scopes_pcs_size); 172 if (dependencies_size != 0) tty->print_cr(" dependencies = %u", dependencies_size); 173 if (handler_table_size != 0) tty->print_cr(" handler table = %u", handler_table_size); 174 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %u", nul_chk_table_size); 175 #if INCLUDE_JVMCI 176 if (speculations_size != 0) tty->print_cr(" speculations = %u", speculations_size); 177 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %u", jvmci_data_size); 178 #endif 179 } 180 }; 181 182 struct native_nmethod_stats_struct { 183 uint native_nmethod_count; 184 uint native_total_size; 185 uint native_relocation_size; 186 uint native_insts_size; 187 uint native_oops_size; 188 uint native_metadata_size; 189 void note_native_nmethod(nmethod* nm) { 190 native_nmethod_count += 1; 191 native_total_size += nm->size(); 192 native_relocation_size += nm->relocation_size(); 193 native_insts_size += nm->insts_size(); 194 native_oops_size += nm->oops_size(); 195 native_metadata_size += nm->metadata_size(); 196 } 197 void print_native_nmethod_stats() { 198 if (native_nmethod_count == 0) return; 199 tty->print_cr("Statistics for %u native nmethods:", native_nmethod_count); 200 if (native_total_size != 0) tty->print_cr(" N. total size = %u", native_total_size); 201 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %u", native_relocation_size); 202 if (native_insts_size != 0) tty->print_cr(" N. main code = %u", native_insts_size); 203 if (native_oops_size != 0) tty->print_cr(" N. oops = %u", native_oops_size); 204 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %u", native_metadata_size); 205 } 206 }; 207 208 struct pc_nmethod_stats_struct { 209 uint pc_desc_resets; // number of resets (= number of caches) 210 uint pc_desc_queries; // queries to nmethod::find_pc_desc 211 uint pc_desc_approx; // number of those which have approximate true 212 uint pc_desc_repeats; // number of _pc_descs[0] hits 213 uint pc_desc_hits; // number of LRU cache hits 214 uint pc_desc_tests; // total number of PcDesc examinations 215 uint pc_desc_searches; // total number of quasi-binary search steps 216 uint pc_desc_adds; // number of LUR cache insertions 217 218 void print_pc_stats() { 219 tty->print_cr("PcDesc Statistics: %u queries, %.2f comparisons per query", 220 pc_desc_queries, 221 (double)(pc_desc_tests + pc_desc_searches) 222 / pc_desc_queries); 223 tty->print_cr(" caches=%d queries=%u/%u, hits=%u+%u, tests=%u+%u, adds=%u", 224 pc_desc_resets, 225 pc_desc_queries, pc_desc_approx, 226 pc_desc_repeats, pc_desc_hits, 227 pc_desc_tests, pc_desc_searches, pc_desc_adds); 228 } 229 }; 230 231 #ifdef COMPILER1 232 static java_nmethod_stats_struct c1_java_nmethod_stats; 233 #endif 234 #ifdef COMPILER2 235 static java_nmethod_stats_struct c2_java_nmethod_stats; 236 #endif 237 #if INCLUDE_JVMCI 238 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 239 #endif 240 static java_nmethod_stats_struct unknown_java_nmethod_stats; 241 242 static native_nmethod_stats_struct native_nmethod_stats; 243 static pc_nmethod_stats_struct pc_nmethod_stats; 244 245 static void note_java_nmethod(nmethod* nm) { 246 #ifdef COMPILER1 247 if (nm->is_compiled_by_c1()) { 248 c1_java_nmethod_stats.note_nmethod(nm); 249 } else 250 #endif 251 #ifdef COMPILER2 252 if (nm->is_compiled_by_c2()) { 253 c2_java_nmethod_stats.note_nmethod(nm); 254 } else 255 #endif 256 #if INCLUDE_JVMCI 257 if (nm->is_compiled_by_jvmci()) { 258 jvmci_java_nmethod_stats.note_nmethod(nm); 259 } else 260 #endif 261 { 262 unknown_java_nmethod_stats.note_nmethod(nm); 263 } 264 } 265 #endif // !PRODUCT 266 267 //--------------------------------------------------------------------------------- 268 269 270 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 271 assert(pc != nullptr, "Must be non null"); 272 assert(exception.not_null(), "Must be non null"); 273 assert(handler != nullptr, "Must be non null"); 274 275 _count = 0; 276 _exception_type = exception->klass(); 277 _next = nullptr; 278 _purge_list_next = nullptr; 279 280 add_address_and_handler(pc,handler); 281 } 282 283 284 address ExceptionCache::match(Handle exception, address pc) { 285 assert(pc != nullptr,"Must be non null"); 286 assert(exception.not_null(),"Must be non null"); 287 if (exception->klass() == exception_type()) { 288 return (test_address(pc)); 289 } 290 291 return nullptr; 292 } 293 294 295 bool ExceptionCache::match_exception_with_space(Handle exception) { 296 assert(exception.not_null(),"Must be non null"); 297 if (exception->klass() == exception_type() && count() < cache_size) { 298 return true; 299 } 300 return false; 301 } 302 303 304 address ExceptionCache::test_address(address addr) { 305 int limit = count(); 306 for (int i = 0; i < limit; i++) { 307 if (pc_at(i) == addr) { 308 return handler_at(i); 309 } 310 } 311 return nullptr; 312 } 313 314 315 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 316 if (test_address(addr) == handler) return true; 317 318 int index = count(); 319 if (index < cache_size) { 320 set_pc_at(index, addr); 321 set_handler_at(index, handler); 322 increment_count(); 323 return true; 324 } 325 return false; 326 } 327 328 ExceptionCache* ExceptionCache::next() { 329 return Atomic::load(&_next); 330 } 331 332 void ExceptionCache::set_next(ExceptionCache *ec) { 333 Atomic::store(&_next, ec); 334 } 335 336 //----------------------------------------------------------------------------- 337 338 339 // Helper used by both find_pc_desc methods. 340 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 341 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 342 if (!approximate) 343 return pc->pc_offset() == pc_offset; 344 else 345 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 346 } 347 348 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 349 if (initial_pc_desc == nullptr) { 350 _pc_descs[0] = nullptr; // native method; no PcDescs at all 351 return; 352 } 353 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 354 // reset the cache by filling it with benign (non-null) values 355 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 356 for (int i = 0; i < cache_size; i++) 357 _pc_descs[i] = initial_pc_desc; 358 } 359 360 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 361 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 362 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 363 364 // Note: one might think that caching the most recently 365 // read value separately would be a win, but one would be 366 // wrong. When many threads are updating it, the cache 367 // line it's in would bounce between caches, negating 368 // any benefit. 369 370 // In order to prevent race conditions do not load cache elements 371 // repeatedly, but use a local copy: 372 PcDesc* res; 373 374 // Step one: Check the most recently added value. 375 res = _pc_descs[0]; 376 if (res == nullptr) return nullptr; // native method; no PcDescs at all 377 if (match_desc(res, pc_offset, approximate)) { 378 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 379 return res; 380 } 381 382 // Step two: Check the rest of the LRU cache. 383 for (int i = 1; i < cache_size; ++i) { 384 res = _pc_descs[i]; 385 if (res->pc_offset() < 0) break; // optimization: skip empty cache 386 if (match_desc(res, pc_offset, approximate)) { 387 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 388 return res; 389 } 390 } 391 392 // Report failure. 393 return nullptr; 394 } 395 396 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 397 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 398 // Update the LRU cache by shifting pc_desc forward. 399 for (int i = 0; i < cache_size; i++) { 400 PcDesc* next = _pc_descs[i]; 401 _pc_descs[i] = pc_desc; 402 pc_desc = next; 403 } 404 } 405 406 // adjust pcs_size so that it is a multiple of both oopSize and 407 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 408 // of oopSize, then 2*sizeof(PcDesc) is) 409 static int adjust_pcs_size(int pcs_size) { 410 int nsize = align_up(pcs_size, oopSize); 411 if ((nsize % sizeof(PcDesc)) != 0) { 412 nsize = pcs_size + sizeof(PcDesc); 413 } 414 assert((nsize % oopSize) == 0, "correct alignment"); 415 return nsize; 416 } 417 418 419 int nmethod::total_size() const { 420 return 421 consts_size() + 422 insts_size() + 423 stub_size() + 424 scopes_data_size() + 425 scopes_pcs_size() + 426 handler_table_size() + 427 nul_chk_table_size(); 428 } 429 430 const char* nmethod::compile_kind() const { 431 if (is_osr_method()) return "osr"; 432 if (method() != nullptr && is_native_method()) { 433 if (method()->is_continuation_native_intrinsic()) { 434 return "cnt"; 435 } 436 return "c2n"; 437 } 438 return nullptr; 439 } 440 441 // Fill in default values for various flag fields 442 void nmethod::init_defaults() { 443 _state = not_installed; 444 _has_flushed_dependencies = 0; 445 _load_reported = false; // jvmti state 446 447 _oops_do_mark_link = nullptr; 448 _osr_link = nullptr; 449 #if INCLUDE_RTM_OPT 450 _rtm_state = NoRTM; 451 #endif 452 } 453 454 #ifdef ASSERT 455 class CheckForOopsClosure : public OopClosure { 456 bool _found_oop = false; 457 public: 458 virtual void do_oop(oop* o) { _found_oop = true; } 459 virtual void do_oop(narrowOop* o) { _found_oop = true; } 460 bool found_oop() { return _found_oop; } 461 }; 462 class CheckForMetadataClosure : public MetadataClosure { 463 bool _found_metadata = false; 464 Metadata* _ignore = nullptr; 465 public: 466 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {} 467 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; } 468 bool found_metadata() { return _found_metadata; } 469 }; 470 471 static void assert_no_oops_or_metadata(nmethod* nm) { 472 if (nm == nullptr) return; 473 assert(nm->oop_maps() == nullptr, "expectation"); 474 475 CheckForOopsClosure cfo; 476 nm->oops_do(&cfo); 477 assert(!cfo.found_oop(), "no oops allowed"); 478 479 // We allow an exception for the own Method, but require its class to be permanent. 480 Method* own_method = nm->method(); 481 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method); 482 nm->metadata_do(&cfm); 483 assert(!cfm.found_metadata(), "no metadata allowed"); 484 485 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(), 486 "Method's class needs to be permanent"); 487 } 488 #endif 489 490 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 491 int compile_id, 492 CodeBuffer *code_buffer, 493 int vep_offset, 494 int frame_complete, 495 int frame_size, 496 ByteSize basic_lock_owner_sp_offset, 497 ByteSize basic_lock_sp_offset, 498 OopMapSet* oop_maps, 499 int exception_handler) { 500 code_buffer->finalize_oop_references(method); 501 // create nmethod 502 nmethod* nm = nullptr; 503 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 504 { 505 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 506 507 CodeOffsets offsets; 508 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 509 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 510 if (exception_handler != -1) { 511 offsets.set_value(CodeOffsets::Exceptions, exception_handler); 512 } 513 514 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space. 515 // IsUnloadingBehaviour::is_unloading needs to handle them separately. 516 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space(); 517 nm = new (native_nmethod_size, allow_NonNMethod_space) 518 nmethod(method(), compiler_none, native_nmethod_size, 519 compile_id, &offsets, 520 code_buffer, frame_size, 521 basic_lock_owner_sp_offset, 522 basic_lock_sp_offset, 523 oop_maps); 524 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); ) 525 NOT_PRODUCT(if (nm != nullptr) native_nmethod_stats.note_native_nmethod(nm)); 526 } 527 528 if (nm != nullptr) { 529 // verify nmethod 530 debug_only(nm->verify();) // might block 531 532 nm->log_new_nmethod(); 533 } 534 return nm; 535 } 536 537 nmethod* nmethod::new_nmethod(const methodHandle& method, 538 int compile_id, 539 int entry_bci, 540 CodeOffsets* offsets, 541 int orig_pc_offset, 542 DebugInformationRecorder* debug_info, 543 Dependencies* dependencies, 544 CodeBuffer* code_buffer, int frame_size, 545 OopMapSet* oop_maps, 546 ExceptionHandlerTable* handler_table, 547 ImplicitExceptionTable* nul_chk_table, 548 AbstractCompiler* compiler, 549 CompLevel comp_level 550 #if INCLUDE_JVMCI 551 , char* speculations, 552 int speculations_len, 553 JVMCINMethodData* jvmci_data 554 #endif 555 ) 556 { 557 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 558 code_buffer->finalize_oop_references(method); 559 // create nmethod 560 nmethod* nm = nullptr; 561 #if INCLUDE_JVMCI 562 int jvmci_data_size = compiler->is_jvmci() ? jvmci_data->size() : 0; 563 #endif 564 int nmethod_size = 565 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 566 + adjust_pcs_size(debug_info->pcs_size()) 567 + align_up((int)dependencies->size_in_bytes(), oopSize) 568 + align_up(handler_table->size_in_bytes() , oopSize) 569 + align_up(nul_chk_table->size_in_bytes() , oopSize) 570 #if INCLUDE_JVMCI 571 + align_up(speculations_len , oopSize) 572 + align_up(jvmci_data_size , oopSize) 573 #endif 574 + align_up(debug_info->data_size() , oopSize); 575 { 576 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 577 578 nm = new (nmethod_size, comp_level) 579 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 580 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 581 oop_maps, 582 handler_table, 583 nul_chk_table, 584 compiler, 585 comp_level 586 #if INCLUDE_JVMCI 587 , speculations, 588 speculations_len, 589 jvmci_data 590 #endif 591 ); 592 593 if (nm != nullptr) { 594 // To make dependency checking during class loading fast, record 595 // the nmethod dependencies in the classes it is dependent on. 596 // This allows the dependency checking code to simply walk the 597 // class hierarchy above the loaded class, checking only nmethods 598 // which are dependent on those classes. The slow way is to 599 // check every nmethod for dependencies which makes it linear in 600 // the number of methods compiled. For applications with a lot 601 // classes the slow way is too slow. 602 for (Dependencies::DepStream deps(nm); deps.next(); ) { 603 if (deps.type() == Dependencies::call_site_target_value) { 604 // CallSite dependencies are managed on per-CallSite instance basis. 605 oop call_site = deps.argument_oop(0); 606 MethodHandles::add_dependent_nmethod(call_site, nm); 607 } else { 608 InstanceKlass* ik = deps.context_type(); 609 if (ik == nullptr) { 610 continue; // ignore things like evol_method 611 } 612 // record this nmethod as dependent on this klass 613 ik->add_dependent_nmethod(nm); 614 } 615 } 616 NOT_PRODUCT(if (nm != nullptr) note_java_nmethod(nm)); 617 } 618 } 619 // Do verification and logging outside CodeCache_lock. 620 if (nm != nullptr) { 621 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 622 DEBUG_ONLY(nm->verify();) 623 nm->log_new_nmethod(); 624 } 625 return nm; 626 } 627 628 // For native wrappers 629 nmethod::nmethod( 630 Method* method, 631 CompilerType type, 632 int nmethod_size, 633 int compile_id, 634 CodeOffsets* offsets, 635 CodeBuffer* code_buffer, 636 int frame_size, 637 ByteSize basic_lock_owner_sp_offset, 638 ByteSize basic_lock_sp_offset, 639 OopMapSet* oop_maps ) 640 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true), 641 _unlinked_next(nullptr), 642 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 643 _native_basic_lock_sp_offset(basic_lock_sp_offset), 644 _is_unloading_state(0) 645 { 646 { 647 int scopes_data_offset = 0; 648 int deoptimize_offset = 0; 649 int deoptimize_mh_offset = 0; 650 651 debug_only(NoSafepointVerifier nsv;) 652 assert_locked_or_safepoint(CodeCache_lock); 653 654 init_defaults(); 655 _comp_level = CompLevel_none; 656 _entry_bci = InvocationEntryBci; 657 // We have no exception handler or deopt handler make the 658 // values something that will never match a pc like the nmethod vtable entry 659 _exception_offset = 0; 660 _orig_pc_offset = 0; 661 _gc_epoch = CodeCache::gc_epoch(); 662 663 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 664 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 665 _oops_offset = data_offset(); 666 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 667 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 668 _scopes_pcs_offset = scopes_data_offset; 669 _dependencies_offset = _scopes_pcs_offset; 670 _handler_table_offset = _dependencies_offset; 671 _nul_chk_table_offset = _handler_table_offset; 672 _skipped_instructions_size = code_buffer->total_skipped_instructions_size(); 673 #if INCLUDE_JVMCI 674 _speculations_offset = _nul_chk_table_offset; 675 _jvmci_data_offset = _speculations_offset; 676 _nmethod_end_offset = _jvmci_data_offset; 677 #else 678 _nmethod_end_offset = _nul_chk_table_offset; 679 #endif 680 _compile_id = compile_id; 681 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 682 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 683 _osr_entry_point = nullptr; 684 _exception_cache = nullptr; 685 _pc_desc_container.reset_to(nullptr); 686 687 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 688 689 _scopes_data_begin = (address) this + scopes_data_offset; 690 _deopt_handler_begin = (address) this + deoptimize_offset; 691 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 692 693 code_buffer->copy_code_and_locs_to(this); 694 code_buffer->copy_values_to(this); 695 696 clear_unloading_state(); 697 698 Universe::heap()->register_nmethod(this); 699 debug_only(Universe::heap()->verify_nmethod(this)); 700 701 CodeCache::commit(this); 702 703 finalize_relocations(); 704 } 705 706 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 707 ttyLocker ttyl; // keep the following output all in one block 708 // This output goes directly to the tty, not the compiler log. 709 // To enable tools to match it up with the compilation activity, 710 // be sure to tag this tty output with the compile ID. 711 if (xtty != nullptr) { 712 xtty->begin_head("print_native_nmethod"); 713 xtty->method(_method); 714 xtty->stamp(); 715 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 716 } 717 // Print the header part, then print the requested information. 718 // This is both handled in decode2(), called via print_code() -> decode() 719 if (PrintNativeNMethods) { 720 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------"); 721 print_code(); 722 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 723 #if defined(SUPPORT_DATA_STRUCTS) 724 if (AbstractDisassembler::show_structs()) { 725 if (oop_maps != nullptr) { 726 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning 727 oop_maps->print_on(tty); 728 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 729 } 730 } 731 #endif 732 } else { 733 print(); // print the header part only. 734 } 735 #if defined(SUPPORT_DATA_STRUCTS) 736 if (AbstractDisassembler::show_structs()) { 737 if (PrintRelocations) { 738 print_relocations(); 739 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 740 } 741 } 742 #endif 743 if (xtty != nullptr) { 744 xtty->tail("print_native_nmethod"); 745 } 746 } 747 } 748 749 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 750 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 751 } 752 753 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () { 754 // Try MethodNonProfiled and MethodProfiled. 755 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled); 756 if (return_value != nullptr || !allow_NonNMethod_space) return return_value; 757 // Try NonNMethod or give up. 758 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod); 759 } 760 761 nmethod::nmethod( 762 Method* method, 763 CompilerType type, 764 int nmethod_size, 765 int compile_id, 766 int entry_bci, 767 CodeOffsets* offsets, 768 int orig_pc_offset, 769 DebugInformationRecorder* debug_info, 770 Dependencies* dependencies, 771 CodeBuffer *code_buffer, 772 int frame_size, 773 OopMapSet* oop_maps, 774 ExceptionHandlerTable* handler_table, 775 ImplicitExceptionTable* nul_chk_table, 776 AbstractCompiler* compiler, 777 CompLevel comp_level 778 #if INCLUDE_JVMCI 779 , char* speculations, 780 int speculations_len, 781 JVMCINMethodData* jvmci_data 782 #endif 783 ) 784 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true), 785 _unlinked_next(nullptr), 786 _native_receiver_sp_offset(in_ByteSize(-1)), 787 _native_basic_lock_sp_offset(in_ByteSize(-1)), 788 _is_unloading_state(0) 789 { 790 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 791 { 792 debug_only(NoSafepointVerifier nsv;) 793 assert_locked_or_safepoint(CodeCache_lock); 794 795 _deopt_handler_begin = (address) this; 796 _deopt_mh_handler_begin = (address) this; 797 798 init_defaults(); 799 _entry_bci = entry_bci; 800 _compile_id = compile_id; 801 _comp_level = comp_level; 802 _orig_pc_offset = orig_pc_offset; 803 _gc_epoch = CodeCache::gc_epoch(); 804 805 // Section offsets 806 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 807 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 808 set_ctable_begin(header_begin() + _consts_offset); 809 _skipped_instructions_size = code_buffer->total_skipped_instructions_size(); 810 811 #if INCLUDE_JVMCI 812 if (compiler->is_jvmci()) { 813 // JVMCI might not produce any stub sections 814 if (offsets->value(CodeOffsets::Exceptions) != -1) { 815 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 816 } else { 817 _exception_offset = -1; 818 } 819 if (offsets->value(CodeOffsets::Deopt) != -1) { 820 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 821 } else { 822 _deopt_handler_begin = nullptr; 823 } 824 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 825 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 826 } else { 827 _deopt_mh_handler_begin = nullptr; 828 } 829 } else 830 #endif 831 { 832 // Exception handler and deopt handler are in the stub section 833 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 834 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 835 836 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 837 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 838 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 839 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 840 } else { 841 _deopt_mh_handler_begin = nullptr; 842 } 843 } 844 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 845 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 846 } else { 847 _unwind_handler_offset = -1; 848 } 849 850 _oops_offset = data_offset(); 851 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 852 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 853 854 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 855 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 856 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize); 857 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 858 #if INCLUDE_JVMCI 859 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 860 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize); 861 int jvmci_data_size = compiler->is_jvmci() ? jvmci_data->size() : 0; 862 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); 863 #else 864 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 865 #endif 866 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 867 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 868 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 869 _exception_cache = nullptr; 870 _scopes_data_begin = (address) this + scopes_data_offset; 871 872 _pc_desc_container.reset_to(scopes_pcs_begin()); 873 874 code_buffer->copy_code_and_locs_to(this); 875 // Copy contents of ScopeDescRecorder to nmethod 876 code_buffer->copy_values_to(this); 877 debug_info->copy_to(this); 878 dependencies->copy_to(this); 879 clear_unloading_state(); 880 881 #if INCLUDE_JVMCI 882 if (compiler->is_jvmci()) { 883 // Initialize the JVMCINMethodData object inlined into nm 884 jvmci_nmethod_data()->copy(jvmci_data); 885 } 886 #endif 887 888 Universe::heap()->register_nmethod(this); 889 debug_only(Universe::heap()->verify_nmethod(this)); 890 891 CodeCache::commit(this); 892 893 finalize_relocations(); 894 895 // Copy contents of ExceptionHandlerTable to nmethod 896 handler_table->copy_to(this); 897 nul_chk_table->copy_to(this); 898 899 #if INCLUDE_JVMCI 900 // Copy speculations to nmethod 901 if (speculations_size() != 0) { 902 memcpy(speculations_begin(), speculations, speculations_len); 903 } 904 #endif 905 906 // we use the information of entry points to find out if a method is 907 // static or non static 908 assert(compiler->is_c2() || compiler->is_jvmci() || 909 _method->is_static() == (entry_point() == _verified_entry_point), 910 " entry points must be same for static methods and vice versa"); 911 } 912 } 913 914 // Print a short set of xml attributes to identify this nmethod. The 915 // output should be embedded in some other element. 916 void nmethod::log_identity(xmlStream* log) const { 917 log->print(" compile_id='%d'", compile_id()); 918 const char* nm_kind = compile_kind(); 919 if (nm_kind != nullptr) log->print(" compile_kind='%s'", nm_kind); 920 log->print(" compiler='%s'", compiler_name()); 921 if (TieredCompilation) { 922 log->print(" level='%d'", comp_level()); 923 } 924 #if INCLUDE_JVMCI 925 if (jvmci_nmethod_data() != nullptr) { 926 const char* jvmci_name = jvmci_nmethod_data()->name(); 927 if (jvmci_name != nullptr) { 928 log->print(" jvmci_mirror_name='"); 929 log->text("%s", jvmci_name); 930 log->print("'"); 931 } 932 } 933 #endif 934 } 935 936 937 #define LOG_OFFSET(log, name) \ 938 if (p2i(name##_end()) - p2i(name##_begin())) \ 939 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 940 p2i(name##_begin()) - p2i(this)) 941 942 943 void nmethod::log_new_nmethod() const { 944 if (LogCompilation && xtty != nullptr) { 945 ttyLocker ttyl; 946 xtty->begin_elem("nmethod"); 947 log_identity(xtty); 948 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 949 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 950 951 LOG_OFFSET(xtty, relocation); 952 LOG_OFFSET(xtty, consts); 953 LOG_OFFSET(xtty, insts); 954 LOG_OFFSET(xtty, stub); 955 LOG_OFFSET(xtty, scopes_data); 956 LOG_OFFSET(xtty, scopes_pcs); 957 LOG_OFFSET(xtty, dependencies); 958 LOG_OFFSET(xtty, handler_table); 959 LOG_OFFSET(xtty, nul_chk_table); 960 LOG_OFFSET(xtty, oops); 961 LOG_OFFSET(xtty, metadata); 962 963 xtty->method(method()); 964 xtty->stamp(); 965 xtty->end_elem(); 966 } 967 } 968 969 #undef LOG_OFFSET 970 971 972 // Print out more verbose output usually for a newly created nmethod. 973 void nmethod::print_on(outputStream* st, const char* msg) const { 974 if (st != nullptr) { 975 ttyLocker ttyl; 976 if (WizardMode) { 977 CompileTask::print(st, this, msg, /*short_form:*/ true); 978 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 979 } else { 980 CompileTask::print(st, this, msg, /*short_form:*/ false); 981 } 982 } 983 } 984 985 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) { 986 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 987 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 988 print_nmethod(printnmethods); 989 } 990 } 991 992 void nmethod::print_nmethod(bool printmethod) { 993 ttyLocker ttyl; // keep the following output all in one block 994 if (xtty != nullptr) { 995 xtty->begin_head("print_nmethod"); 996 log_identity(xtty); 997 xtty->stamp(); 998 xtty->end_head(); 999 } 1000 // Print the header part, then print the requested information. 1001 // This is both handled in decode2(). 1002 if (printmethod) { 1003 ResourceMark m; 1004 if (is_compiled_by_c1()) { 1005 tty->cr(); 1006 tty->print_cr("============================= C1-compiled nmethod =============================="); 1007 } 1008 if (is_compiled_by_jvmci()) { 1009 tty->cr(); 1010 tty->print_cr("=========================== JVMCI-compiled nmethod ============================="); 1011 } 1012 tty->print_cr("----------------------------------- Assembly -----------------------------------"); 1013 decode2(tty); 1014 #if defined(SUPPORT_DATA_STRUCTS) 1015 if (AbstractDisassembler::show_structs()) { 1016 // Print the oops from the underlying CodeBlob as well. 1017 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1018 print_oops(tty); 1019 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1020 print_metadata(tty); 1021 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1022 print_pcs(); 1023 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1024 if (oop_maps() != nullptr) { 1025 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning 1026 oop_maps()->print_on(tty); 1027 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1028 } 1029 } 1030 #endif 1031 } else { 1032 print(); // print the header part only. 1033 } 1034 1035 #if defined(SUPPORT_DATA_STRUCTS) 1036 if (AbstractDisassembler::show_structs()) { 1037 methodHandle mh(Thread::current(), _method); 1038 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) { 1039 print_scopes(); 1040 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1041 } 1042 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) { 1043 print_relocations(); 1044 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1045 } 1046 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) { 1047 print_dependencies_on(tty); 1048 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1049 } 1050 if (printmethod || PrintExceptionHandlers) { 1051 print_handler_table(); 1052 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1053 print_nul_chk_table(); 1054 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1055 } 1056 1057 if (printmethod) { 1058 print_recorded_oops(); 1059 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1060 print_recorded_metadata(); 1061 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1062 } 1063 } 1064 #endif 1065 1066 if (xtty != nullptr) { 1067 xtty->tail("print_nmethod"); 1068 } 1069 } 1070 1071 1072 // Promote one word from an assembly-time handle to a live embedded oop. 1073 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1074 if (handle == nullptr || 1075 // As a special case, IC oops are initialized to 1 or -1. 1076 handle == (jobject) Universe::non_oop_word()) { 1077 *(void**)dest = handle; 1078 } else { 1079 *dest = JNIHandles::resolve_non_null(handle); 1080 } 1081 } 1082 1083 1084 // Have to have the same name because it's called by a template 1085 void nmethod::copy_values(GrowableArray<jobject>* array) { 1086 int length = array->length(); 1087 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1088 oop* dest = oops_begin(); 1089 for (int index = 0 ; index < length; index++) { 1090 initialize_immediate_oop(&dest[index], array->at(index)); 1091 } 1092 1093 // Now we can fix up all the oops in the code. We need to do this 1094 // in the code because the assembler uses jobjects as placeholders. 1095 // The code and relocations have already been initialized by the 1096 // CodeBlob constructor, so it is valid even at this early point to 1097 // iterate over relocations and patch the code. 1098 fix_oop_relocations(nullptr, nullptr, /*initialize_immediates=*/ true); 1099 } 1100 1101 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1102 int length = array->length(); 1103 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1104 Metadata** dest = metadata_begin(); 1105 for (int index = 0 ; index < length; index++) { 1106 dest[index] = array->at(index); 1107 } 1108 } 1109 1110 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1111 // re-patch all oop-bearing instructions, just in case some oops moved 1112 RelocIterator iter(this, begin, end); 1113 while (iter.next()) { 1114 if (iter.type() == relocInfo::oop_type) { 1115 oop_Relocation* reloc = iter.oop_reloc(); 1116 if (initialize_immediates && reloc->oop_is_immediate()) { 1117 oop* dest = reloc->oop_addr(); 1118 jobject obj = *reinterpret_cast<jobject*>(dest); 1119 initialize_immediate_oop(dest, obj); 1120 } 1121 // Refresh the oop-related bits of this instruction. 1122 reloc->fix_oop_relocation(); 1123 } else if (iter.type() == relocInfo::metadata_type) { 1124 metadata_Relocation* reloc = iter.metadata_reloc(); 1125 reloc->fix_metadata_relocation(); 1126 } 1127 } 1128 } 1129 1130 static void install_post_call_nop_displacement(nmethod* nm, address pc) { 1131 NativePostCallNop* nop = nativePostCallNop_at((address) pc); 1132 intptr_t cbaddr = (intptr_t) nm; 1133 intptr_t offset = ((intptr_t) pc) - cbaddr; 1134 1135 int oopmap_slot = nm->oop_maps()->find_slot_for_offset(int((intptr_t) pc - (intptr_t) nm->code_begin())); 1136 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks 1137 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset); 1138 } else if (((oopmap_slot & 0xff) == oopmap_slot) && ((offset & 0xffffff) == offset)) { 1139 jint value = (oopmap_slot << 24) | (jint) offset; 1140 nop->patch(value); 1141 } else { 1142 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset); 1143 } 1144 } 1145 1146 void nmethod::finalize_relocations() { 1147 NoSafepointVerifier nsv; 1148 1149 // Make sure that post call nops fill in nmethod offsets eagerly so 1150 // we don't have to race with deoptimization 1151 RelocIterator iter(this); 1152 while (iter.next()) { 1153 if (iter.type() == relocInfo::post_call_nop_type) { 1154 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc(); 1155 address pc = reloc->addr(); 1156 install_post_call_nop_displacement(this, pc); 1157 } 1158 } 1159 } 1160 1161 void nmethod::make_deoptimized() { 1162 if (!Continuations::enabled()) { 1163 // Don't deopt this again. 1164 set_deoptimized_done(); 1165 return; 1166 } 1167 1168 assert(method() == nullptr || can_be_deoptimized(), ""); 1169 1170 CompiledICLocker ml(this); 1171 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1172 1173 // If post call nops have been already patched, we can just bail-out. 1174 if (has_been_deoptimized()) { 1175 return; 1176 } 1177 1178 ResourceMark rm; 1179 RelocIterator iter(this, oops_reloc_begin()); 1180 1181 while (iter.next()) { 1182 1183 switch (iter.type()) { 1184 case relocInfo::virtual_call_type: 1185 case relocInfo::opt_virtual_call_type: { 1186 CompiledIC *ic = CompiledIC_at(&iter); 1187 address pc = ic->end_of_call(); 1188 NativePostCallNop* nop = nativePostCallNop_at(pc); 1189 if (nop != nullptr) { 1190 nop->make_deopt(); 1191 } 1192 assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); 1193 break; 1194 } 1195 case relocInfo::static_call_type: { 1196 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1197 address pc = csc->end_of_call(); 1198 NativePostCallNop* nop = nativePostCallNop_at(pc); 1199 //tty->print_cr(" - static pc %p", pc); 1200 if (nop != nullptr) { 1201 nop->make_deopt(); 1202 } 1203 // We can't assert here, there are some calls to stubs / runtime 1204 // that have reloc data and doesn't have a post call NOP. 1205 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); 1206 break; 1207 } 1208 default: 1209 break; 1210 } 1211 } 1212 // Don't deopt this again. 1213 set_deoptimized_done(); 1214 } 1215 1216 void nmethod::verify_clean_inline_caches() { 1217 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1218 1219 ResourceMark rm; 1220 RelocIterator iter(this, oops_reloc_begin()); 1221 while(iter.next()) { 1222 switch(iter.type()) { 1223 case relocInfo::virtual_call_type: 1224 case relocInfo::opt_virtual_call_type: { 1225 CompiledIC *ic = CompiledIC_at(&iter); 1226 CodeBlob *cb = CodeCache::find_blob(ic->ic_destination()); 1227 assert(cb != nullptr, "destination not in CodeBlob?"); 1228 nmethod* nm = cb->as_nmethod_or_null(); 1229 if( nm != nullptr ) { 1230 // Verify that inline caches pointing to bad nmethods are clean 1231 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1232 assert(ic->is_clean(), "IC should be clean"); 1233 } 1234 } 1235 break; 1236 } 1237 case relocInfo::static_call_type: { 1238 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1239 CodeBlob *cb = CodeCache::find_blob(csc->destination()); 1240 assert(cb != nullptr, "destination not in CodeBlob?"); 1241 nmethod* nm = cb->as_nmethod_or_null(); 1242 if( nm != nullptr ) { 1243 // Verify that inline caches pointing to bad nmethods are clean 1244 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1245 assert(csc->is_clean(), "IC should be clean"); 1246 } 1247 } 1248 break; 1249 } 1250 default: 1251 break; 1252 } 1253 } 1254 } 1255 1256 void nmethod::mark_as_maybe_on_stack() { 1257 Atomic::store(&_gc_epoch, CodeCache::gc_epoch()); 1258 } 1259 1260 bool nmethod::is_maybe_on_stack() { 1261 // If the condition below is true, it means that the nmethod was found to 1262 // be alive the previous completed marking cycle. 1263 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle(); 1264 } 1265 1266 void nmethod::inc_decompile_count() { 1267 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1268 // Could be gated by ProfileTraps, but do not bother... 1269 Method* m = method(); 1270 if (m == nullptr) return; 1271 MethodData* mdo = m->method_data(); 1272 if (mdo == nullptr) return; 1273 // There is a benign race here. See comments in methodData.hpp. 1274 mdo->inc_decompile_count(); 1275 } 1276 1277 bool nmethod::try_transition(signed char new_state_int) { 1278 signed char new_state = new_state_int; 1279 assert_lock_strong(CompiledMethod_lock); 1280 signed char old_state = _state; 1281 if (old_state >= new_state) { 1282 // Ensure monotonicity of transitions. 1283 return false; 1284 } 1285 Atomic::store(&_state, new_state); 1286 return true; 1287 } 1288 1289 void nmethod::invalidate_osr_method() { 1290 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1291 // Remove from list of active nmethods 1292 if (method() != nullptr) { 1293 method()->method_holder()->remove_osr_nmethod(this); 1294 } 1295 } 1296 1297 void nmethod::log_state_change() const { 1298 if (LogCompilation) { 1299 if (xtty != nullptr) { 1300 ttyLocker ttyl; // keep the following output all in one block 1301 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'", 1302 os::current_thread_id()); 1303 log_identity(xtty); 1304 xtty->stamp(); 1305 xtty->end_elem(); 1306 } 1307 } 1308 1309 CompileTask::print_ul(this, "made not entrant"); 1310 if (PrintCompilation) { 1311 print_on(tty, "made not entrant"); 1312 } 1313 } 1314 1315 void nmethod::unlink_from_method() { 1316 if (method() != nullptr) { 1317 method()->unlink_code(this); 1318 } 1319 } 1320 1321 // Invalidate code 1322 bool nmethod::make_not_entrant() { 1323 // This can be called while the system is already at a safepoint which is ok 1324 NoSafepointVerifier nsv; 1325 1326 if (is_unloading()) { 1327 // If the nmethod is unloading, then it is already not entrant through 1328 // the nmethod entry barriers. No need to do anything; GC will unload it. 1329 return false; 1330 } 1331 1332 if (Atomic::load(&_state) == not_entrant) { 1333 // Avoid taking the lock if already in required state. 1334 // This is safe from races because the state is an end-state, 1335 // which the nmethod cannot back out of once entered. 1336 // No need for fencing either. 1337 return false; 1338 } 1339 1340 { 1341 // Enter critical section. Does not block for safepoint. 1342 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? nullptr : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1343 1344 if (Atomic::load(&_state) == not_entrant) { 1345 // another thread already performed this transition so nothing 1346 // to do, but return false to indicate this. 1347 return false; 1348 } 1349 1350 if (is_osr_method()) { 1351 // This logic is equivalent to the logic below for patching the 1352 // verified entry point of regular methods. 1353 // this effectively makes the osr nmethod not entrant 1354 invalidate_osr_method(); 1355 } else { 1356 // The caller can be calling the method statically or through an inline 1357 // cache call. 1358 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1359 SharedRuntime::get_handle_wrong_method_stub()); 1360 } 1361 1362 if (update_recompile_counts()) { 1363 // Mark the method as decompiled. 1364 inc_decompile_count(); 1365 } 1366 1367 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1368 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { 1369 // If nmethod entry barriers are not supported, we won't mark 1370 // nmethods as on-stack when they become on-stack. So we 1371 // degrade to a less accurate flushing strategy, for now. 1372 mark_as_maybe_on_stack(); 1373 } 1374 1375 // Change state 1376 bool success = try_transition(not_entrant); 1377 assert(success, "Transition can't fail"); 1378 1379 // Log the transition once 1380 log_state_change(); 1381 1382 // Remove nmethod from method. 1383 unlink_from_method(); 1384 1385 } // leave critical region under CompiledMethod_lock 1386 1387 #if INCLUDE_JVMCI 1388 // Invalidate can't occur while holding the Patching lock 1389 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1390 if (nmethod_data != nullptr) { 1391 nmethod_data->invalidate_nmethod_mirror(this); 1392 } 1393 #endif 1394 1395 #ifdef ASSERT 1396 if (is_osr_method() && method() != nullptr) { 1397 // Make sure osr nmethod is invalidated, i.e. not on the list 1398 bool found = method()->method_holder()->remove_osr_nmethod(this); 1399 assert(!found, "osr nmethod should have been invalidated"); 1400 } 1401 #endif 1402 1403 return true; 1404 } 1405 1406 // For concurrent GCs, there must be a handshake between unlink and flush 1407 void nmethod::unlink() { 1408 if (_unlinked_next != nullptr) { 1409 // Already unlinked. It can be invoked twice because concurrent code cache 1410 // unloading might need to restart when inline cache cleaning fails due to 1411 // running out of ICStubs, which can only be refilled at safepoints 1412 return; 1413 } 1414 1415 flush_dependencies(); 1416 1417 // unlink_from_method will take the CompiledMethod_lock. 1418 // In this case we don't strictly need it when unlinking nmethods from 1419 // the Method, because it is only concurrently unlinked by 1420 // the entry barrier, which acquires the per nmethod lock. 1421 unlink_from_method(); 1422 clear_ic_callsites(); 1423 1424 if (is_osr_method()) { 1425 invalidate_osr_method(); 1426 } 1427 1428 #if INCLUDE_JVMCI 1429 // Clear the link between this nmethod and a HotSpotNmethod mirror 1430 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1431 if (nmethod_data != nullptr) { 1432 nmethod_data->invalidate_nmethod_mirror(this); 1433 } 1434 #endif 1435 1436 // Post before flushing as jmethodID is being used 1437 post_compiled_method_unload(); 1438 1439 // Register for flushing when it is safe. For concurrent class unloading, 1440 // that would be after the unloading handshake, and for STW class unloading 1441 // that would be when getting back to the VM thread. 1442 CodeCache::register_unlinked(this); 1443 } 1444 1445 void nmethod::flush() { 1446 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1447 1448 // completely deallocate this method 1449 Events::log(Thread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1450 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1451 "/Free CodeCache:" SIZE_FORMAT "Kb", 1452 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1453 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1454 1455 // We need to deallocate any ExceptionCache data. 1456 // Note that we do not need to grab the nmethod lock for this, it 1457 // better be thread safe if we're disposing of it! 1458 ExceptionCache* ec = exception_cache(); 1459 while(ec != nullptr) { 1460 ExceptionCache* next = ec->next(); 1461 delete ec; 1462 ec = next; 1463 } 1464 1465 Universe::heap()->unregister_nmethod(this); 1466 CodeCache::unregister_old_nmethod(this); 1467 1468 CodeBlob::flush(); 1469 CodeCache::free(this); 1470 } 1471 1472 oop nmethod::oop_at(int index) const { 1473 if (index == 0) { 1474 return nullptr; 1475 } 1476 return NMethodAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1477 } 1478 1479 oop nmethod::oop_at_phantom(int index) const { 1480 if (index == 0) { 1481 return nullptr; 1482 } 1483 return NMethodAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); 1484 } 1485 1486 // 1487 // Notify all classes this nmethod is dependent on that it is no 1488 // longer dependent. 1489 1490 void nmethod::flush_dependencies() { 1491 if (!has_flushed_dependencies()) { 1492 set_has_flushed_dependencies(); 1493 for (Dependencies::DepStream deps(this); deps.next(); ) { 1494 if (deps.type() == Dependencies::call_site_target_value) { 1495 // CallSite dependencies are managed on per-CallSite instance basis. 1496 oop call_site = deps.argument_oop(0); 1497 MethodHandles::clean_dependency_context(call_site); 1498 } else { 1499 InstanceKlass* ik = deps.context_type(); 1500 if (ik == nullptr) { 1501 continue; // ignore things like evol_method 1502 } 1503 // During GC liveness of dependee determines class that needs to be updated. 1504 // The GC may clean dependency contexts concurrently and in parallel. 1505 ik->clean_dependency_context(); 1506 } 1507 } 1508 } 1509 } 1510 1511 void nmethod::post_compiled_method(CompileTask* task) { 1512 task->mark_success(); 1513 task->set_nm_content_size(content_size()); 1514 task->set_nm_insts_size(insts_size()); 1515 task->set_nm_total_size(total_size()); 1516 1517 // JVMTI -- compiled method notification (must be done outside lock) 1518 post_compiled_method_load_event(); 1519 1520 if (CompilationLog::log() != nullptr) { 1521 CompilationLog::log()->log_nmethod(JavaThread::current(), this); 1522 } 1523 1524 const DirectiveSet* directive = task->directive(); 1525 maybe_print_nmethod(directive); 1526 } 1527 1528 // ------------------------------------------------------------------ 1529 // post_compiled_method_load_event 1530 // new method for install_code() path 1531 // Transfer information from compilation to jvmti 1532 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) { 1533 // This is a bad time for a safepoint. We don't want 1534 // this nmethod to get unloaded while we're queueing the event. 1535 NoSafepointVerifier nsv; 1536 1537 Method* m = method(); 1538 HOTSPOT_COMPILED_METHOD_LOAD( 1539 (char *) m->klass_name()->bytes(), 1540 m->klass_name()->utf8_length(), 1541 (char *) m->name()->bytes(), 1542 m->name()->utf8_length(), 1543 (char *) m->signature()->bytes(), 1544 m->signature()->utf8_length(), 1545 insts_begin(), insts_size()); 1546 1547 1548 if (JvmtiExport::should_post_compiled_method_load()) { 1549 // Only post unload events if load events are found. 1550 set_load_reported(); 1551 // If a JavaThread hasn't been passed in, let the Service thread 1552 // (which is a real Java thread) post the event 1553 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this); 1554 if (state == nullptr) { 1555 // Execute any barrier code for this nmethod as if it's called, since 1556 // keeping it alive looks like stack walking. 1557 run_nmethod_entry_barrier(); 1558 ServiceThread::enqueue_deferred_event(&event); 1559 } else { 1560 // This enters the nmethod barrier outside in the caller. 1561 state->enqueue_event(&event); 1562 } 1563 } 1564 } 1565 1566 void nmethod::post_compiled_method_unload() { 1567 assert(_method != nullptr, "just checking"); 1568 DTRACE_METHOD_UNLOAD_PROBE(method()); 1569 1570 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1571 // post the event. The Method* will not be valid when this is freed. 1572 1573 // Don't bother posting the unload if the load event wasn't posted. 1574 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) { 1575 JvmtiDeferredEvent event = 1576 JvmtiDeferredEvent::compiled_method_unload_event( 1577 method()->jmethod_id(), insts_begin()); 1578 ServiceThread::enqueue_deferred_event(&event); 1579 } 1580 } 1581 1582 // Iterate over metadata calling this function. Used by RedefineClasses 1583 void nmethod::metadata_do(MetadataClosure* f) { 1584 { 1585 // Visit all immediate references that are embedded in the instruction stream. 1586 RelocIterator iter(this, oops_reloc_begin()); 1587 while (iter.next()) { 1588 if (iter.type() == relocInfo::metadata_type) { 1589 metadata_Relocation* r = iter.metadata_reloc(); 1590 // In this metadata, we must only follow those metadatas directly embedded in 1591 // the code. Other metadatas (oop_index>0) are seen as part of 1592 // the metadata section below. 1593 assert(1 == (r->metadata_is_immediate()) + 1594 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1595 "metadata must be found in exactly one place"); 1596 if (r->metadata_is_immediate() && r->metadata_value() != nullptr) { 1597 Metadata* md = r->metadata_value(); 1598 if (md != _method) f->do_metadata(md); 1599 } 1600 } else if (iter.type() == relocInfo::virtual_call_type) { 1601 // Check compiledIC holders associated with this nmethod 1602 ResourceMark rm; 1603 CompiledIC *ic = CompiledIC_at(&iter); 1604 if (ic->is_icholder_call()) { 1605 CompiledICHolder* cichk = ic->cached_icholder(); 1606 f->do_metadata(cichk->holder_metadata()); 1607 f->do_metadata(cichk->holder_klass()); 1608 } else { 1609 Metadata* ic_oop = ic->cached_metadata(); 1610 if (ic_oop != nullptr) { 1611 f->do_metadata(ic_oop); 1612 } 1613 } 1614 } 1615 } 1616 } 1617 1618 // Visit the metadata section 1619 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1620 if (*p == Universe::non_oop_word() || *p == nullptr) continue; // skip non-oops 1621 Metadata* md = *p; 1622 f->do_metadata(md); 1623 } 1624 1625 // Visit metadata not embedded in the other places. 1626 if (_method != nullptr) f->do_metadata(_method); 1627 } 1628 1629 // Heuristic for nuking nmethods even though their oops are live. 1630 // Main purpose is to reduce code cache pressure and get rid of 1631 // nmethods that don't seem to be all that relevant any longer. 1632 bool nmethod::is_cold() { 1633 if (!MethodFlushing || is_native_method() || is_not_installed()) { 1634 // No heuristic unloading at all 1635 return false; 1636 } 1637 1638 if (!is_maybe_on_stack() && is_not_entrant()) { 1639 // Not entrant nmethods that are not on any stack can just 1640 // be removed 1641 return true; 1642 } 1643 1644 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1645 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { 1646 // On platforms that don't support nmethod entry barriers, we can't 1647 // trust the temporal aspect of the gc epochs. So we can't detect 1648 // cold nmethods on such platforms. 1649 return false; 1650 } 1651 1652 if (!UseCodeCacheFlushing) { 1653 // Bail out if we don't heuristically remove nmethods 1654 return false; 1655 } 1656 1657 // Other code can be phased out more gradually after N GCs 1658 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count(); 1659 } 1660 1661 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1662 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle. 1663 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1664 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1665 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1666 1667 class IsUnloadingState: public AllStatic { 1668 static const uint8_t _is_unloading_mask = 1; 1669 static const uint8_t _is_unloading_shift = 0; 1670 static const uint8_t _unloading_cycle_mask = 6; 1671 static const uint8_t _unloading_cycle_shift = 1; 1672 1673 static uint8_t set_is_unloading(uint8_t state, bool value) { 1674 state &= (uint8_t)~_is_unloading_mask; 1675 if (value) { 1676 state |= 1 << _is_unloading_shift; 1677 } 1678 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1679 return state; 1680 } 1681 1682 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1683 state &= (uint8_t)~_unloading_cycle_mask; 1684 state |= (uint8_t)(value << _unloading_cycle_shift); 1685 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1686 return state; 1687 } 1688 1689 public: 1690 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1691 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1692 1693 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1694 uint8_t state = 0; 1695 state = set_is_unloading(state, is_unloading); 1696 state = set_unloading_cycle(state, unloading_cycle); 1697 return state; 1698 } 1699 }; 1700 1701 bool nmethod::is_unloading() { 1702 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1703 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1704 if (state_is_unloading) { 1705 return true; 1706 } 1707 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1708 uint8_t current_cycle = CodeCache::unloading_cycle(); 1709 if (state_unloading_cycle == current_cycle) { 1710 return false; 1711 } 1712 1713 // The IsUnloadingBehaviour is responsible for calculating if the nmethod 1714 // should be unloaded. This can be either because there is a dead oop, 1715 // or because is_cold() heuristically determines it is time to unload. 1716 state_unloading_cycle = current_cycle; 1717 state_is_unloading = IsUnloadingBehaviour::is_unloading(this); 1718 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1719 1720 // Note that if an nmethod has dead oops, everyone will agree that the 1721 // nmethod is_unloading. However, the is_cold heuristics can yield 1722 // different outcomes, so we guard the computed result with a CAS 1723 // to ensure all threads have a shared view of whether an nmethod 1724 // is_unloading or not. 1725 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed); 1726 1727 if (found_state == state) { 1728 // First to change state, we win 1729 return state_is_unloading; 1730 } else { 1731 // State already set, so use it 1732 return IsUnloadingState::is_unloading(found_state); 1733 } 1734 } 1735 1736 void nmethod::clear_unloading_state() { 1737 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1738 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1739 } 1740 1741 1742 // This is called at the end of the strong tracing/marking phase of a 1743 // GC to unload an nmethod if it contains otherwise unreachable 1744 // oops or is heuristically found to be not important. 1745 void nmethod::do_unloading(bool unloading_occurred) { 1746 // Make sure the oop's ready to receive visitors 1747 if (is_unloading()) { 1748 unlink(); 1749 } else { 1750 guarantee(unload_nmethod_caches(unloading_occurred), 1751 "Should not need transition stubs"); 1752 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1753 if (bs_nm != nullptr) { 1754 bs_nm->disarm(this); 1755 } 1756 } 1757 } 1758 1759 void nmethod::oops_do(OopClosure* f, bool allow_dead) { 1760 // Prevent extra code cache walk for platforms that don't have immediate oops. 1761 if (relocInfo::mustIterateImmediateOopsInCode()) { 1762 RelocIterator iter(this, oops_reloc_begin()); 1763 1764 while (iter.next()) { 1765 if (iter.type() == relocInfo::oop_type ) { 1766 oop_Relocation* r = iter.oop_reloc(); 1767 // In this loop, we must only follow those oops directly embedded in 1768 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1769 assert(1 == (r->oop_is_immediate()) + 1770 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1771 "oop must be found in exactly one place"); 1772 if (r->oop_is_immediate() && r->oop_value() != nullptr) { 1773 f->do_oop(r->oop_addr()); 1774 } 1775 } 1776 } 1777 } 1778 1779 // Scopes 1780 // This includes oop constants not inlined in the code stream. 1781 for (oop* p = oops_begin(); p < oops_end(); p++) { 1782 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1783 f->do_oop(p); 1784 } 1785 } 1786 1787 void nmethod::follow_nmethod(OopIterateClosure* cl) { 1788 // Process oops in the nmethod 1789 oops_do(cl); 1790 1791 // CodeCache unloading support 1792 mark_as_maybe_on_stack(); 1793 1794 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1795 bs_nm->disarm(this); 1796 1797 // There's an assumption made that this function is not used by GCs that 1798 // relocate objects, and therefore we don't call fix_oop_relocations. 1799 } 1800 1801 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1802 1803 void nmethod::oops_do_log_change(const char* state) { 1804 LogTarget(Trace, gc, nmethod) lt; 1805 if (lt.is_enabled()) { 1806 LogStream ls(lt); 1807 CompileTask::print(&ls, this, state, true /* short_form */); 1808 } 1809 } 1810 1811 bool nmethod::oops_do_try_claim() { 1812 if (oops_do_try_claim_weak_request()) { 1813 nmethod* result = oops_do_try_add_to_list_as_weak_done(); 1814 assert(result == nullptr, "adding to global list as weak done must always succeed."); 1815 return true; 1816 } 1817 return false; 1818 } 1819 1820 bool nmethod::oops_do_try_claim_weak_request() { 1821 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1822 1823 if ((_oops_do_mark_link == nullptr) && 1824 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) { 1825 oops_do_log_change("oops_do, mark weak request"); 1826 return true; 1827 } 1828 return false; 1829 } 1830 1831 void nmethod::oops_do_set_strong_done(nmethod* old_head) { 1832 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag); 1833 } 1834 1835 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() { 1836 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1837 1838 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)); 1839 if (old_next == nullptr) { 1840 oops_do_log_change("oops_do, mark strong done"); 1841 } 1842 return old_next; 1843 } 1844 1845 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) { 1846 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1847 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak"); 1848 1849 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag)); 1850 if (old_next == next) { 1851 oops_do_log_change("oops_do, mark strong request"); 1852 } 1853 return old_next; 1854 } 1855 1856 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) { 1857 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1858 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done"); 1859 1860 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag)); 1861 if (old_next == next) { 1862 oops_do_log_change("oops_do, mark weak done -> mark strong done"); 1863 return true; 1864 } 1865 return false; 1866 } 1867 1868 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() { 1869 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1870 1871 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag || 1872 extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1873 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1874 1875 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1876 // Self-loop if needed. 1877 if (old_head == nullptr) { 1878 old_head = this; 1879 } 1880 // Try to install end of list and weak done tag. 1881 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)) { 1882 oops_do_log_change("oops_do, mark weak done"); 1883 return nullptr; 1884 } else { 1885 return old_head; 1886 } 1887 } 1888 1889 void nmethod::oops_do_add_to_list_as_strong_done() { 1890 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1891 1892 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1893 // Self-loop if needed. 1894 if (old_head == nullptr) { 1895 old_head = this; 1896 } 1897 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u", 1898 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1899 1900 oops_do_set_strong_done(old_head); 1901 } 1902 1903 void nmethod::oops_do_process_weak(OopsDoProcessor* p) { 1904 if (!oops_do_try_claim_weak_request()) { 1905 // Failed to claim for weak processing. 1906 oops_do_log_change("oops_do, mark weak request fail"); 1907 return; 1908 } 1909 1910 p->do_regular_processing(this); 1911 1912 nmethod* old_head = oops_do_try_add_to_list_as_weak_done(); 1913 if (old_head == nullptr) { 1914 return; 1915 } 1916 oops_do_log_change("oops_do, mark weak done fail"); 1917 // Adding to global list failed, another thread added a strong request. 1918 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1919 "must be but is %u", extract_state(_oops_do_mark_link)); 1920 1921 oops_do_log_change("oops_do, mark weak request -> mark strong done"); 1922 1923 oops_do_set_strong_done(old_head); 1924 // Do missing strong processing. 1925 p->do_remaining_strong_processing(this); 1926 } 1927 1928 void nmethod::oops_do_process_strong(OopsDoProcessor* p) { 1929 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done(); 1930 if (next_raw == nullptr) { 1931 p->do_regular_processing(this); 1932 oops_do_add_to_list_as_strong_done(); 1933 return; 1934 } 1935 // Claim failed. Figure out why and handle it. 1936 if (oops_do_has_weak_request(next_raw)) { 1937 oops_do_mark_link* old = next_raw; 1938 // Claim failed because being weak processed (state == "weak request"). 1939 // Try to request deferred strong processing. 1940 next_raw = oops_do_try_add_strong_request(old); 1941 if (next_raw == old) { 1942 // Successfully requested deferred strong processing. 1943 return; 1944 } 1945 // Failed because of a concurrent transition. No longer in "weak request" state. 1946 } 1947 if (oops_do_has_any_strong_state(next_raw)) { 1948 // Already claimed for strong processing or requested for such. 1949 return; 1950 } 1951 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) { 1952 // Successfully claimed "weak done" as "strong done". Do the missing marking. 1953 p->do_remaining_strong_processing(this); 1954 return; 1955 } 1956 // Claim failed, some other thread got it. 1957 } 1958 1959 void nmethod::oops_do_marking_prologue() { 1960 assert_at_safepoint(); 1961 1962 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1963 assert(_oops_do_mark_nmethods == nullptr, "must be empty"); 1964 } 1965 1966 void nmethod::oops_do_marking_epilogue() { 1967 assert_at_safepoint(); 1968 1969 nmethod* next = _oops_do_mark_nmethods; 1970 _oops_do_mark_nmethods = nullptr; 1971 if (next != nullptr) { 1972 nmethod* cur; 1973 do { 1974 cur = next; 1975 next = extract_nmethod(cur->_oops_do_mark_link); 1976 cur->_oops_do_mark_link = nullptr; 1977 DEBUG_ONLY(cur->verify_oop_relocations()); 1978 1979 LogTarget(Trace, gc, nmethod) lt; 1980 if (lt.is_enabled()) { 1981 LogStream ls(lt); 1982 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1983 } 1984 // End if self-loop has been detected. 1985 } while (cur != next); 1986 } 1987 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1988 } 1989 1990 inline bool includes(void* p, void* from, void* to) { 1991 return from <= p && p < to; 1992 } 1993 1994 1995 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1996 assert(count >= 2, "must be sentinel values, at least"); 1997 1998 #ifdef ASSERT 1999 // must be sorted and unique; we do a binary search in find_pc_desc() 2000 int prev_offset = pcs[0].pc_offset(); 2001 assert(prev_offset == PcDesc::lower_offset_limit, 2002 "must start with a sentinel"); 2003 for (int i = 1; i < count; i++) { 2004 int this_offset = pcs[i].pc_offset(); 2005 assert(this_offset > prev_offset, "offsets must be sorted"); 2006 prev_offset = this_offset; 2007 } 2008 assert(prev_offset == PcDesc::upper_offset_limit, 2009 "must end with a sentinel"); 2010 #endif //ASSERT 2011 2012 // Search for MethodHandle invokes and tag the nmethod. 2013 for (int i = 0; i < count; i++) { 2014 if (pcs[i].is_method_handle_invoke()) { 2015 set_has_method_handle_invokes(true); 2016 break; 2017 } 2018 } 2019 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != nullptr), "must have deopt mh handler"); 2020 2021 int size = count * sizeof(PcDesc); 2022 assert(scopes_pcs_size() >= size, "oob"); 2023 memcpy(scopes_pcs_begin(), pcs, size); 2024 2025 // Adjust the final sentinel downward. 2026 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2027 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2028 last_pc->set_pc_offset(content_size() + 1); 2029 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2030 // Fill any rounding gaps with copies of the last record. 2031 last_pc[1] = last_pc[0]; 2032 } 2033 // The following assert could fail if sizeof(PcDesc) is not 2034 // an integral multiple of oopSize (the rounding term). 2035 // If it fails, change the logic to always allocate a multiple 2036 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2037 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2038 } 2039 2040 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2041 assert(scopes_data_size() >= size, "oob"); 2042 memcpy(scopes_data_begin(), buffer, size); 2043 } 2044 2045 #ifdef ASSERT 2046 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 2047 PcDesc* lower = search.scopes_pcs_begin(); 2048 PcDesc* upper = search.scopes_pcs_end(); 2049 lower += 1; // exclude initial sentinel 2050 PcDesc* res = nullptr; 2051 for (PcDesc* p = lower; p < upper; p++) { 2052 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2053 if (match_desc(p, pc_offset, approximate)) { 2054 if (res == nullptr) 2055 res = p; 2056 else 2057 res = (PcDesc*) badAddress; 2058 } 2059 } 2060 return res; 2061 } 2062 #endif 2063 2064 2065 // Finds a PcDesc with real-pc equal to "pc" 2066 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 2067 address base_address = search.code_begin(); 2068 if ((pc < base_address) || 2069 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2070 return nullptr; // PC is wildly out of range 2071 } 2072 int pc_offset = (int) (pc - base_address); 2073 2074 // Check the PcDesc cache if it contains the desired PcDesc 2075 // (This as an almost 100% hit rate.) 2076 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2077 if (res != nullptr) { 2078 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 2079 return res; 2080 } 2081 2082 // Fallback algorithm: quasi-linear search for the PcDesc 2083 // Find the last pc_offset less than the given offset. 2084 // The successor must be the required match, if there is a match at all. 2085 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2086 PcDesc* lower = search.scopes_pcs_begin(); 2087 PcDesc* upper = search.scopes_pcs_end(); 2088 upper -= 1; // exclude final sentinel 2089 if (lower >= upper) return nullptr; // native method; no PcDescs at all 2090 2091 #define assert_LU_OK \ 2092 /* invariant on lower..upper during the following search: */ \ 2093 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2094 assert(upper->pc_offset() >= pc_offset, "sanity") 2095 assert_LU_OK; 2096 2097 // Use the last successful return as a split point. 2098 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2099 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2100 if (mid->pc_offset() < pc_offset) { 2101 lower = mid; 2102 } else { 2103 upper = mid; 2104 } 2105 2106 // Take giant steps at first (4096, then 256, then 16, then 1) 2107 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2108 const int RADIX = (1 << LOG2_RADIX); 2109 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2110 while ((mid = lower + step) < upper) { 2111 assert_LU_OK; 2112 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2113 if (mid->pc_offset() < pc_offset) { 2114 lower = mid; 2115 } else { 2116 upper = mid; 2117 break; 2118 } 2119 } 2120 assert_LU_OK; 2121 } 2122 2123 // Sneak up on the value with a linear search of length ~16. 2124 while (true) { 2125 assert_LU_OK; 2126 mid = lower + 1; 2127 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2128 if (mid->pc_offset() < pc_offset) { 2129 lower = mid; 2130 } else { 2131 upper = mid; 2132 break; 2133 } 2134 } 2135 #undef assert_LU_OK 2136 2137 if (match_desc(upper, pc_offset, approximate)) { 2138 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 2139 if (!Thread::current_in_asgct()) { 2140 // we don't want to modify the cache if we're in ASGCT 2141 // which is typically called in a signal handler 2142 _pc_desc_cache.add_pc_desc(upper); 2143 } 2144 return upper; 2145 } else { 2146 assert(nullptr == linear_search(search, pc_offset, approximate), "search ok"); 2147 return nullptr; 2148 } 2149 } 2150 2151 2152 void nmethod::check_all_dependencies(DepChange& changes) { 2153 // Checked dependencies are allocated into this ResourceMark 2154 ResourceMark rm; 2155 2156 // Turn off dependency tracing while actually testing dependencies. 2157 NOT_PRODUCT( FlagSetting fs(Dependencies::_verify_in_progress, true)); 2158 2159 typedef ResourceHashtable<DependencySignature, int, 11027, 2160 AnyObj::RESOURCE_AREA, mtInternal, 2161 &DependencySignature::hash, 2162 &DependencySignature::equals> DepTable; 2163 2164 DepTable* table = new DepTable(); 2165 2166 // Iterate over live nmethods and check dependencies of all nmethods that are not 2167 // marked for deoptimization. A particular dependency is only checked once. 2168 NMethodIterator iter(NMethodIterator::only_not_unloading); 2169 while(iter.next()) { 2170 nmethod* nm = iter.method(); 2171 // Only notify for live nmethods 2172 if (!nm->is_marked_for_deoptimization()) { 2173 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2174 // Construct abstraction of a dependency. 2175 DependencySignature* current_sig = new DependencySignature(deps); 2176 2177 // Determine if dependency is already checked. table->put(...) returns 2178 // 'true' if the dependency is added (i.e., was not in the hashtable). 2179 if (table->put(*current_sig, 1)) { 2180 if (deps.check_dependency() != nullptr) { 2181 // Dependency checking failed. Print out information about the failed 2182 // dependency and finally fail with an assert. We can fail here, since 2183 // dependency checking is never done in a product build. 2184 tty->print_cr("Failed dependency:"); 2185 changes.print(); 2186 nm->print(); 2187 nm->print_dependencies_on(tty); 2188 assert(false, "Should have been marked for deoptimization"); 2189 } 2190 } 2191 } 2192 } 2193 } 2194 } 2195 2196 bool nmethod::check_dependency_on(DepChange& changes) { 2197 // What has happened: 2198 // 1) a new class dependee has been added 2199 // 2) dependee and all its super classes have been marked 2200 bool found_check = false; // set true if we are upset 2201 for (Dependencies::DepStream deps(this); deps.next(); ) { 2202 // Evaluate only relevant dependencies. 2203 if (deps.spot_check_dependency_at(changes) != nullptr) { 2204 found_check = true; 2205 NOT_DEBUG(break); 2206 } 2207 } 2208 return found_check; 2209 } 2210 2211 // Called from mark_for_deoptimization, when dependee is invalidated. 2212 bool nmethod::is_dependent_on_method(Method* dependee) { 2213 for (Dependencies::DepStream deps(this); deps.next(); ) { 2214 if (deps.type() != Dependencies::evol_method) 2215 continue; 2216 Method* method = deps.method_argument(0); 2217 if (method == dependee) return true; 2218 } 2219 return false; 2220 } 2221 2222 void nmethod_init() { 2223 // make sure you didn't forget to adjust the filler fields 2224 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2225 } 2226 2227 // ----------------------------------------------------------------------------- 2228 // Verification 2229 2230 class VerifyOopsClosure: public OopClosure { 2231 nmethod* _nm; 2232 bool _ok; 2233 public: 2234 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2235 bool ok() { return _ok; } 2236 virtual void do_oop(oop* p) { 2237 if (oopDesc::is_oop_or_null(*p)) return; 2238 // Print diagnostic information before calling print_nmethod(). 2239 // Assertions therein might prevent call from returning. 2240 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2241 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2242 if (_ok) { 2243 _nm->print_nmethod(true); 2244 _ok = false; 2245 } 2246 } 2247 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2248 }; 2249 2250 class VerifyMetadataClosure: public MetadataClosure { 2251 public: 2252 void do_metadata(Metadata* md) { 2253 if (md->is_method()) { 2254 Method* method = (Method*)md; 2255 assert(!method->is_old(), "Should not be installing old methods"); 2256 } 2257 } 2258 }; 2259 2260 2261 void nmethod::verify() { 2262 if (is_not_entrant()) 2263 return; 2264 2265 // Make sure all the entry points are correctly aligned for patching. 2266 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2267 2268 // assert(oopDesc::is_oop(method()), "must be valid"); 2269 2270 ResourceMark rm; 2271 2272 if (!CodeCache::contains(this)) { 2273 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2274 } 2275 2276 if(is_native_method() ) 2277 return; 2278 2279 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2280 if (nm != this) { 2281 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2282 } 2283 2284 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2285 if (! p->verify(this)) { 2286 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2287 } 2288 } 2289 2290 #ifdef ASSERT 2291 #if INCLUDE_JVMCI 2292 { 2293 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap 2294 ImmutableOopMapSet* oms = oop_maps(); 2295 ImplicitExceptionTable implicit_table(this); 2296 for (uint i = 0; i < implicit_table.len(); i++) { 2297 int exec_offset = (int) implicit_table.get_exec_offset(i); 2298 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) { 2299 assert(pc_desc_at(code_begin() + exec_offset) != nullptr, "missing PcDesc"); 2300 bool found = false; 2301 for (int i = 0, imax = oms->count(); i < imax; i++) { 2302 if (oms->pair_at(i)->pc_offset() == exec_offset) { 2303 found = true; 2304 break; 2305 } 2306 } 2307 assert(found, "missing oopmap"); 2308 } 2309 } 2310 } 2311 #endif 2312 #endif 2313 2314 VerifyOopsClosure voc(this); 2315 oops_do(&voc); 2316 assert(voc.ok(), "embedded oops must be OK"); 2317 Universe::heap()->verify_nmethod(this); 2318 2319 assert(_oops_do_mark_link == nullptr, "_oops_do_mark_link for %s should be nullptr but is " PTR_FORMAT, 2320 nm->method()->external_name(), p2i(_oops_do_mark_link)); 2321 verify_scopes(); 2322 2323 CompiledICLocker nm_verify(this); 2324 VerifyMetadataClosure vmc; 2325 metadata_do(&vmc); 2326 } 2327 2328 2329 void nmethod::verify_interrupt_point(address call_site) { 2330 2331 // Verify IC only when nmethod installation is finished. 2332 if (!is_not_installed()) { 2333 if (CompiledICLocker::is_safe(this)) { 2334 CompiledIC_at(this, call_site); 2335 } else { 2336 CompiledICLocker ml_verify(this); 2337 CompiledIC_at(this, call_site); 2338 } 2339 } 2340 2341 HandleMark hm(Thread::current()); 2342 2343 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2344 assert(pd != nullptr, "PcDesc must exist"); 2345 for (ScopeDesc* sd = new ScopeDesc(this, pd); 2346 !sd->is_top(); sd = sd->sender()) { 2347 sd->verify(); 2348 } 2349 } 2350 2351 void nmethod::verify_scopes() { 2352 if( !method() ) return; // Runtime stubs have no scope 2353 if (method()->is_native()) return; // Ignore stub methods. 2354 // iterate through all interrupt point 2355 // and verify the debug information is valid. 2356 RelocIterator iter((nmethod*)this); 2357 while (iter.next()) { 2358 address stub = nullptr; 2359 switch (iter.type()) { 2360 case relocInfo::virtual_call_type: 2361 verify_interrupt_point(iter.addr()); 2362 break; 2363 case relocInfo::opt_virtual_call_type: 2364 stub = iter.opt_virtual_call_reloc()->static_stub(); 2365 verify_interrupt_point(iter.addr()); 2366 break; 2367 case relocInfo::static_call_type: 2368 stub = iter.static_call_reloc()->static_stub(); 2369 //verify_interrupt_point(iter.addr()); 2370 break; 2371 case relocInfo::runtime_call_type: 2372 case relocInfo::runtime_call_w_cp_type: { 2373 address destination = iter.reloc()->value(); 2374 // Right now there is no way to find out which entries support 2375 // an interrupt point. It would be nice if we had this 2376 // information in a table. 2377 break; 2378 } 2379 default: 2380 break; 2381 } 2382 assert(stub == nullptr || stub_contains(stub), "static call stub outside stub section"); 2383 } 2384 } 2385 2386 2387 // ----------------------------------------------------------------------------- 2388 // Printing operations 2389 2390 void nmethod::print() const { 2391 ttyLocker ttyl; // keep the following output all in one block 2392 print(tty); 2393 } 2394 2395 void nmethod::print(outputStream* st) const { 2396 ResourceMark rm; 2397 2398 st->print("Compiled method "); 2399 2400 if (is_compiled_by_c1()) { 2401 st->print("(c1) "); 2402 } else if (is_compiled_by_c2()) { 2403 st->print("(c2) "); 2404 } else if (is_compiled_by_jvmci()) { 2405 st->print("(JVMCI) "); 2406 } else { 2407 st->print("(n/a) "); 2408 } 2409 2410 print_on(st, nullptr); 2411 2412 if (WizardMode) { 2413 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2414 st->print(" for method " INTPTR_FORMAT , p2i(method())); 2415 st->print(" { "); 2416 st->print_cr("%s ", state()); 2417 st->print_cr("}:"); 2418 } 2419 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2420 p2i(this), 2421 p2i(this) + size(), 2422 size()); 2423 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2424 p2i(relocation_begin()), 2425 p2i(relocation_end()), 2426 relocation_size()); 2427 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2428 p2i(consts_begin()), 2429 p2i(consts_end()), 2430 consts_size()); 2431 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2432 p2i(insts_begin()), 2433 p2i(insts_end()), 2434 insts_size()); 2435 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2436 p2i(stub_begin()), 2437 p2i(stub_end()), 2438 stub_size()); 2439 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2440 p2i(oops_begin()), 2441 p2i(oops_end()), 2442 oops_size()); 2443 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2444 p2i(metadata_begin()), 2445 p2i(metadata_end()), 2446 metadata_size()); 2447 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2448 p2i(scopes_data_begin()), 2449 p2i(scopes_data_end()), 2450 scopes_data_size()); 2451 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2452 p2i(scopes_pcs_begin()), 2453 p2i(scopes_pcs_end()), 2454 scopes_pcs_size()); 2455 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2456 p2i(dependencies_begin()), 2457 p2i(dependencies_end()), 2458 dependencies_size()); 2459 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2460 p2i(handler_table_begin()), 2461 p2i(handler_table_end()), 2462 handler_table_size()); 2463 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2464 p2i(nul_chk_table_begin()), 2465 p2i(nul_chk_table_end()), 2466 nul_chk_table_size()); 2467 #if INCLUDE_JVMCI 2468 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2469 p2i(speculations_begin()), 2470 p2i(speculations_end()), 2471 speculations_size()); 2472 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2473 p2i(jvmci_data_begin()), 2474 p2i(jvmci_data_end()), 2475 jvmci_data_size()); 2476 #endif 2477 } 2478 2479 void nmethod::print_code() { 2480 ResourceMark m; 2481 ttyLocker ttyl; 2482 // Call the specialized decode method of this class. 2483 decode(tty); 2484 } 2485 2486 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN 2487 2488 void nmethod::print_dependencies_on(outputStream* out) { 2489 ResourceMark rm; 2490 stringStream st; 2491 st.print_cr("Dependencies:"); 2492 for (Dependencies::DepStream deps(this); deps.next(); ) { 2493 deps.print_dependency(&st); 2494 InstanceKlass* ctxk = deps.context_type(); 2495 if (ctxk != nullptr) { 2496 if (ctxk->is_dependent_nmethod(this)) { 2497 st.print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2498 } 2499 } 2500 deps.log_dependency(); // put it into the xml log also 2501 } 2502 out->print_raw(st.as_string()); 2503 } 2504 #endif 2505 2506 #if defined(SUPPORT_DATA_STRUCTS) 2507 2508 // Print the oops from the underlying CodeBlob. 2509 void nmethod::print_oops(outputStream* st) { 2510 ResourceMark m; 2511 st->print("Oops:"); 2512 if (oops_begin() < oops_end()) { 2513 st->cr(); 2514 for (oop* p = oops_begin(); p < oops_end(); p++) { 2515 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false); 2516 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2517 if (Universe::contains_non_oop_word(p)) { 2518 st->print_cr("NON_OOP"); 2519 continue; // skip non-oops 2520 } 2521 if (*p == nullptr) { 2522 st->print_cr("nullptr-oop"); 2523 continue; // skip non-oops 2524 } 2525 (*p)->print_value_on(st); 2526 st->cr(); 2527 } 2528 } else { 2529 st->print_cr(" <list empty>"); 2530 } 2531 } 2532 2533 // Print metadata pool. 2534 void nmethod::print_metadata(outputStream* st) { 2535 ResourceMark m; 2536 st->print("Metadata:"); 2537 if (metadata_begin() < metadata_end()) { 2538 st->cr(); 2539 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2540 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false); 2541 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2542 if (*p && *p != Universe::non_oop_word()) { 2543 (*p)->print_value_on(st); 2544 } 2545 st->cr(); 2546 } 2547 } else { 2548 st->print_cr(" <list empty>"); 2549 } 2550 } 2551 2552 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN 2553 void nmethod::print_scopes_on(outputStream* st) { 2554 // Find the first pc desc for all scopes in the code and print it. 2555 ResourceMark rm; 2556 st->print("scopes:"); 2557 if (scopes_pcs_begin() < scopes_pcs_end()) { 2558 st->cr(); 2559 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2560 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2561 continue; 2562 2563 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2564 while (sd != nullptr) { 2565 sd->print_on(st, p); // print output ends with a newline 2566 sd = sd->sender(); 2567 } 2568 } 2569 } else { 2570 st->print_cr(" <list empty>"); 2571 } 2572 } 2573 #endif 2574 2575 #ifndef PRODUCT // RelocIterator does support printing only then. 2576 void nmethod::print_relocations() { 2577 ResourceMark m; // in case methods get printed via the debugger 2578 tty->print_cr("relocations:"); 2579 RelocIterator iter(this); 2580 iter.print(); 2581 } 2582 #endif 2583 2584 void nmethod::print_pcs_on(outputStream* st) { 2585 ResourceMark m; // in case methods get printed via debugger 2586 st->print("pc-bytecode offsets:"); 2587 if (scopes_pcs_begin() < scopes_pcs_end()) { 2588 st->cr(); 2589 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2590 p->print_on(st, this); // print output ends with a newline 2591 } 2592 } else { 2593 st->print_cr(" <list empty>"); 2594 } 2595 } 2596 2597 void nmethod::print_handler_table() { 2598 ExceptionHandlerTable(this).print(code_begin()); 2599 } 2600 2601 void nmethod::print_nul_chk_table() { 2602 ImplicitExceptionTable(this).print(code_begin()); 2603 } 2604 2605 void nmethod::print_recorded_oop(int log_n, int i) { 2606 void* value; 2607 2608 if (i == 0) { 2609 value = nullptr; 2610 } else { 2611 // Be careful around non-oop words. Don't create an oop 2612 // with that value, or it will assert in verification code. 2613 if (Universe::contains_non_oop_word(oop_addr_at(i))) { 2614 value = Universe::non_oop_word(); 2615 } else { 2616 value = oop_at(i); 2617 } 2618 } 2619 2620 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value)); 2621 2622 if (value == Universe::non_oop_word()) { 2623 tty->print("non-oop word"); 2624 } else { 2625 if (value == 0) { 2626 tty->print("nullptr-oop"); 2627 } else { 2628 oop_at(i)->print_value_on(tty); 2629 } 2630 } 2631 2632 tty->cr(); 2633 } 2634 2635 void nmethod::print_recorded_oops() { 2636 const int n = oops_count(); 2637 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2638 tty->print("Recorded oops:"); 2639 if (n > 0) { 2640 tty->cr(); 2641 for (int i = 0; i < n; i++) { 2642 print_recorded_oop(log_n, i); 2643 } 2644 } else { 2645 tty->print_cr(" <list empty>"); 2646 } 2647 } 2648 2649 void nmethod::print_recorded_metadata() { 2650 const int n = metadata_count(); 2651 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2652 tty->print("Recorded metadata:"); 2653 if (n > 0) { 2654 tty->cr(); 2655 for (int i = 0; i < n; i++) { 2656 Metadata* m = metadata_at(i); 2657 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m)); 2658 if (m == (Metadata*)Universe::non_oop_word()) { 2659 tty->print("non-metadata word"); 2660 } else if (m == nullptr) { 2661 tty->print("nullptr-oop"); 2662 } else { 2663 Metadata::print_value_on_maybe_null(tty, m); 2664 } 2665 tty->cr(); 2666 } 2667 } else { 2668 tty->print_cr(" <list empty>"); 2669 } 2670 } 2671 #endif 2672 2673 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2674 2675 void nmethod::print_constant_pool(outputStream* st) { 2676 //----------------------------------- 2677 //---< Print the constant pool >--- 2678 //----------------------------------- 2679 int consts_size = this->consts_size(); 2680 if ( consts_size > 0 ) { 2681 unsigned char* cstart = this->consts_begin(); 2682 unsigned char* cp = cstart; 2683 unsigned char* cend = cp + consts_size; 2684 unsigned int bytes_per_line = 4; 2685 unsigned int CP_alignment = 8; 2686 unsigned int n; 2687 2688 st->cr(); 2689 2690 //---< print CP header to make clear what's printed >--- 2691 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) { 2692 n = bytes_per_line; 2693 st->print_cr("[Constant Pool]"); 2694 Disassembler::print_location(cp, cstart, cend, st, true, true); 2695 Disassembler::print_hexdata(cp, n, st, true); 2696 st->cr(); 2697 } else { 2698 n = (int)((uintptr_t)cp & (bytes_per_line-1)); 2699 st->print_cr("[Constant Pool (unaligned)]"); 2700 } 2701 2702 //---< print CP contents, bytes_per_line at a time >--- 2703 while (cp < cend) { 2704 Disassembler::print_location(cp, cstart, cend, st, true, false); 2705 Disassembler::print_hexdata(cp, n, st, false); 2706 cp += n; 2707 n = bytes_per_line; 2708 st->cr(); 2709 } 2710 2711 //---< Show potential alignment gap between constant pool and code >--- 2712 cend = code_begin(); 2713 if( cp < cend ) { 2714 n = 4; 2715 st->print_cr("[Code entry alignment]"); 2716 while (cp < cend) { 2717 Disassembler::print_location(cp, cstart, cend, st, false, false); 2718 cp += n; 2719 st->cr(); 2720 } 2721 } 2722 } else { 2723 st->print_cr("[Constant Pool (empty)]"); 2724 } 2725 st->cr(); 2726 } 2727 2728 #endif 2729 2730 // Disassemble this nmethod. 2731 // Print additional debug information, if requested. This could be code 2732 // comments, block comments, profiling counters, etc. 2733 // The undisassembled format is useful no disassembler library is available. 2734 // The resulting hex dump (with markers) can be disassembled later, or on 2735 // another system, when/where a disassembler library is available. 2736 void nmethod::decode2(outputStream* ost) const { 2737 2738 // Called from frame::back_trace_with_decode without ResourceMark. 2739 ResourceMark rm; 2740 2741 // Make sure we have a valid stream to print on. 2742 outputStream* st = ost ? ost : tty; 2743 2744 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY) 2745 const bool use_compressed_format = true; 2746 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2747 AbstractDisassembler::show_block_comment()); 2748 #else 2749 const bool use_compressed_format = Disassembler::is_abstract(); 2750 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2751 AbstractDisassembler::show_block_comment()); 2752 #endif 2753 2754 // Decoding an nmethod can write to a PcDescCache (see PcDescCache::add_pc_desc) 2755 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());) 2756 2757 st->cr(); 2758 this->print(st); 2759 st->cr(); 2760 2761 #if defined(SUPPORT_ASSEMBLY) 2762 //---------------------------------- 2763 //---< Print real disassembly >--- 2764 //---------------------------------- 2765 if (! use_compressed_format) { 2766 st->print_cr("[Disassembly]"); 2767 Disassembler::decode(const_cast<nmethod*>(this), st); 2768 st->bol(); 2769 st->print_cr("[/Disassembly]"); 2770 return; 2771 } 2772 #endif 2773 2774 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2775 2776 // Compressed undisassembled disassembly format. 2777 // The following status values are defined/supported: 2778 // = 0 - currently at bol() position, nothing printed yet on current line. 2779 // = 1 - currently at position after print_location(). 2780 // > 1 - in the midst of printing instruction stream bytes. 2781 int compressed_format_idx = 0; 2782 int code_comment_column = 0; 2783 const int instr_maxlen = Assembler::instr_maxlen(); 2784 const uint tabspacing = 8; 2785 unsigned char* start = this->code_begin(); 2786 unsigned char* p = this->code_begin(); 2787 unsigned char* end = this->code_end(); 2788 unsigned char* pss = p; // start of a code section (used for offsets) 2789 2790 if ((start == nullptr) || (end == nullptr)) { 2791 st->print_cr("PrintAssembly not possible due to uninitialized section pointers"); 2792 return; 2793 } 2794 #endif 2795 2796 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2797 //---< plain abstract disassembly, no comments or anything, just section headers >--- 2798 if (use_compressed_format && ! compressed_with_comments) { 2799 const_cast<nmethod*>(this)->print_constant_pool(st); 2800 2801 //---< Open the output (Marker for post-mortem disassembler) >--- 2802 st->print_cr("[MachCode]"); 2803 const char* header = nullptr; 2804 address p0 = p; 2805 while (p < end) { 2806 address pp = p; 2807 while ((p < end) && (header == nullptr)) { 2808 header = nmethod_section_label(p); 2809 pp = p; 2810 p += Assembler::instr_len(p); 2811 } 2812 if (pp > p0) { 2813 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen()); 2814 p0 = pp; 2815 p = pp; 2816 header = nullptr; 2817 } else if (header != nullptr) { 2818 st->bol(); 2819 st->print_cr("%s", header); 2820 header = nullptr; 2821 } 2822 } 2823 //---< Close the output (Marker for post-mortem disassembler) >--- 2824 st->bol(); 2825 st->print_cr("[/MachCode]"); 2826 return; 2827 } 2828 #endif 2829 2830 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2831 //---< abstract disassembly with comments and section headers merged in >--- 2832 if (compressed_with_comments) { 2833 const_cast<nmethod*>(this)->print_constant_pool(st); 2834 2835 //---< Open the output (Marker for post-mortem disassembler) >--- 2836 st->print_cr("[MachCode]"); 2837 while ((p < end) && (p != nullptr)) { 2838 const int instruction_size_in_bytes = Assembler::instr_len(p); 2839 2840 //---< Block comments for nmethod. Interrupts instruction stream, if any. >--- 2841 // Outputs a bol() before and a cr() after, but only if a comment is printed. 2842 // Prints nmethod_section_label as well. 2843 if (AbstractDisassembler::show_block_comment()) { 2844 print_block_comment(st, p); 2845 if (st->position() == 0) { 2846 compressed_format_idx = 0; 2847 } 2848 } 2849 2850 //---< New location information after line break >--- 2851 if (compressed_format_idx == 0) { 2852 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2853 compressed_format_idx = 1; 2854 } 2855 2856 //---< Code comment for current instruction. Address range [p..(p+len)) >--- 2857 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes; 2858 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end 2859 2860 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) { 2861 //---< interrupt instruction byte stream for code comment >--- 2862 if (compressed_format_idx > 1) { 2863 st->cr(); // interrupt byte stream 2864 st->cr(); // add an empty line 2865 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2866 } 2867 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end ); 2868 st->bol(); 2869 compressed_format_idx = 0; 2870 } 2871 2872 //---< New location information after line break >--- 2873 if (compressed_format_idx == 0) { 2874 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2875 compressed_format_idx = 1; 2876 } 2877 2878 //---< Nicely align instructions for readability >--- 2879 if (compressed_format_idx > 1) { 2880 Disassembler::print_delimiter(st); 2881 } 2882 2883 //---< Now, finally, print the actual instruction bytes >--- 2884 unsigned char* p0 = p; 2885 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen); 2886 compressed_format_idx += (int)(p - p0); 2887 2888 if (Disassembler::start_newline(compressed_format_idx-1)) { 2889 st->cr(); 2890 compressed_format_idx = 0; 2891 } 2892 } 2893 //---< Close the output (Marker for post-mortem disassembler) >--- 2894 st->bol(); 2895 st->print_cr("[/MachCode]"); 2896 return; 2897 } 2898 #endif 2899 } 2900 2901 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2902 2903 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2904 RelocIterator iter(this, begin, end); 2905 bool have_one = false; 2906 while (iter.next()) { 2907 have_one = true; 2908 switch (iter.type()) { 2909 case relocInfo::none: return "no_reloc"; 2910 case relocInfo::oop_type: { 2911 // Get a non-resizable resource-allocated stringStream. 2912 // Our callees make use of (nested) ResourceMarks. 2913 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024); 2914 oop_Relocation* r = iter.oop_reloc(); 2915 oop obj = r->oop_value(); 2916 st.print("oop("); 2917 if (obj == nullptr) st.print("nullptr"); 2918 else obj->print_value_on(&st); 2919 st.print(")"); 2920 return st.as_string(); 2921 } 2922 case relocInfo::metadata_type: { 2923 stringStream st; 2924 metadata_Relocation* r = iter.metadata_reloc(); 2925 Metadata* obj = r->metadata_value(); 2926 st.print("metadata("); 2927 if (obj == nullptr) st.print("nullptr"); 2928 else obj->print_value_on(&st); 2929 st.print(")"); 2930 return st.as_string(); 2931 } 2932 case relocInfo::runtime_call_type: 2933 case relocInfo::runtime_call_w_cp_type: { 2934 stringStream st; 2935 st.print("runtime_call"); 2936 CallRelocation* r = (CallRelocation*)iter.reloc(); 2937 address dest = r->destination(); 2938 CodeBlob* cb = CodeCache::find_blob(dest); 2939 if (cb != nullptr) { 2940 st.print(" %s", cb->name()); 2941 } else { 2942 ResourceMark rm; 2943 const int buflen = 1024; 2944 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2945 int offset; 2946 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2947 st.print(" %s", buf); 2948 if (offset != 0) { 2949 st.print("+%d", offset); 2950 } 2951 } 2952 } 2953 return st.as_string(); 2954 } 2955 case relocInfo::virtual_call_type: { 2956 stringStream st; 2957 st.print_raw("virtual_call"); 2958 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2959 Method* m = r->method_value(); 2960 if (m != nullptr) { 2961 assert(m->is_method(), ""); 2962 m->print_short_name(&st); 2963 } 2964 return st.as_string(); 2965 } 2966 case relocInfo::opt_virtual_call_type: { 2967 stringStream st; 2968 st.print_raw("optimized virtual_call"); 2969 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2970 Method* m = r->method_value(); 2971 if (m != nullptr) { 2972 assert(m->is_method(), ""); 2973 m->print_short_name(&st); 2974 } 2975 return st.as_string(); 2976 } 2977 case relocInfo::static_call_type: { 2978 stringStream st; 2979 st.print_raw("static_call"); 2980 static_call_Relocation* r = iter.static_call_reloc(); 2981 Method* m = r->method_value(); 2982 if (m != nullptr) { 2983 assert(m->is_method(), ""); 2984 m->print_short_name(&st); 2985 } 2986 return st.as_string(); 2987 } 2988 case relocInfo::static_stub_type: return "static_stub"; 2989 case relocInfo::external_word_type: return "external_word"; 2990 case relocInfo::internal_word_type: return "internal_word"; 2991 case relocInfo::section_word_type: return "section_word"; 2992 case relocInfo::poll_type: return "poll"; 2993 case relocInfo::poll_return_type: return "poll_return"; 2994 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 2995 case relocInfo::type_mask: return "type_bit_mask"; 2996 2997 default: 2998 break; 2999 } 3000 } 3001 return have_one ? "other" : nullptr; 3002 } 3003 3004 // Return the last scope in (begin..end] 3005 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3006 PcDesc* p = pc_desc_near(begin+1); 3007 if (p != nullptr && p->real_pc(this) <= end) { 3008 return new ScopeDesc(this, p); 3009 } 3010 return nullptr; 3011 } 3012 3013 const char* nmethod::nmethod_section_label(address pos) const { 3014 const char* label = nullptr; 3015 if (pos == code_begin()) label = "[Instructions begin]"; 3016 if (pos == entry_point()) label = "[Entry Point]"; 3017 if (pos == verified_entry_point()) label = "[Verified Entry Point]"; 3018 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]"; 3019 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]"; 3020 // Check stub_code before checking exception_handler or deopt_handler. 3021 if (pos == this->stub_begin()) label = "[Stub Code]"; 3022 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]"; 3023 if (JVMCI_ONLY(_deopt_handler_begin != nullptr &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]"; 3024 return label; 3025 } 3026 3027 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const { 3028 if (print_section_labels) { 3029 const char* label = nmethod_section_label(block_begin); 3030 if (label != nullptr) { 3031 stream->bol(); 3032 stream->print_cr("%s", label); 3033 } 3034 } 3035 3036 if (block_begin == entry_point()) { 3037 Method* m = method(); 3038 if (m != nullptr) { 3039 stream->print(" # "); 3040 m->print_value_on(stream); 3041 stream->cr(); 3042 } 3043 if (m != nullptr && !is_osr_method()) { 3044 ResourceMark rm; 3045 int sizeargs = m->size_of_parameters(); 3046 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3047 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3048 { 3049 int sig_index = 0; 3050 if (!m->is_static()) 3051 sig_bt[sig_index++] = T_OBJECT; // 'this' 3052 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3053 BasicType t = ss.type(); 3054 sig_bt[sig_index++] = t; 3055 if (type2size[t] == 2) { 3056 sig_bt[sig_index++] = T_VOID; 3057 } else { 3058 assert(type2size[t] == 1, "size is 1 or 2"); 3059 } 3060 } 3061 assert(sig_index == sizeargs, ""); 3062 } 3063 const char* spname = "sp"; // make arch-specific? 3064 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs); 3065 int stack_slot_offset = this->frame_size() * wordSize; 3066 int tab1 = 14, tab2 = 24; 3067 int sig_index = 0; 3068 int arg_index = (m->is_static() ? 0 : -1); 3069 bool did_old_sp = false; 3070 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3071 bool at_this = (arg_index == -1); 3072 bool at_old_sp = false; 3073 BasicType t = (at_this ? T_OBJECT : ss.type()); 3074 assert(t == sig_bt[sig_index], "sigs in sync"); 3075 if (at_this) 3076 stream->print(" # this: "); 3077 else 3078 stream->print(" # parm%d: ", arg_index); 3079 stream->move_to(tab1); 3080 VMReg fst = regs[sig_index].first(); 3081 VMReg snd = regs[sig_index].second(); 3082 if (fst->is_reg()) { 3083 stream->print("%s", fst->name()); 3084 if (snd->is_valid()) { 3085 stream->print(":%s", snd->name()); 3086 } 3087 } else if (fst->is_stack()) { 3088 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3089 if (offset == stack_slot_offset) at_old_sp = true; 3090 stream->print("[%s+0x%x]", spname, offset); 3091 } else { 3092 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3093 } 3094 stream->print(" "); 3095 stream->move_to(tab2); 3096 stream->print("= "); 3097 if (at_this) { 3098 m->method_holder()->print_value_on(stream); 3099 } else { 3100 bool did_name = false; 3101 if (!at_this && ss.is_reference()) { 3102 Symbol* name = ss.as_symbol(); 3103 name->print_value_on(stream); 3104 did_name = true; 3105 } 3106 if (!did_name) 3107 stream->print("%s", type2name(t)); 3108 } 3109 if (at_old_sp) { 3110 stream->print(" (%s of caller)", spname); 3111 did_old_sp = true; 3112 } 3113 stream->cr(); 3114 sig_index += type2size[t]; 3115 arg_index += 1; 3116 if (!at_this) ss.next(); 3117 } 3118 if (!did_old_sp) { 3119 stream->print(" # "); 3120 stream->move_to(tab1); 3121 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3122 stream->print(" (%s of caller)", spname); 3123 stream->cr(); 3124 } 3125 } 3126 } 3127 } 3128 3129 // Returns whether this nmethod has code comments. 3130 bool nmethod::has_code_comment(address begin, address end) { 3131 // scopes? 3132 ScopeDesc* sd = scope_desc_in(begin, end); 3133 if (sd != nullptr) return true; 3134 3135 // relocations? 3136 const char* str = reloc_string_for(begin, end); 3137 if (str != nullptr) return true; 3138 3139 // implicit exceptions? 3140 int cont_offset = ImplicitExceptionTable(this).continuation_offset((uint)(begin - code_begin())); 3141 if (cont_offset != 0) return true; 3142 3143 return false; 3144 } 3145 3146 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) { 3147 ImplicitExceptionTable implicit_table(this); 3148 int pc_offset = (int)(begin - code_begin()); 3149 int cont_offset = implicit_table.continuation_offset(pc_offset); 3150 bool oop_map_required = false; 3151 if (cont_offset != 0) { 3152 st->move_to(column, 6, 0); 3153 if (pc_offset == cont_offset) { 3154 st->print("; implicit exception: deoptimizes"); 3155 oop_map_required = true; 3156 } else { 3157 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3158 } 3159 } 3160 3161 // Find an oopmap in (begin, end]. We use the odd half-closed 3162 // interval so that oop maps and scope descs which are tied to the 3163 // byte after a call are printed with the call itself. OopMaps 3164 // associated with implicit exceptions are printed with the implicit 3165 // instruction. 3166 address base = code_begin(); 3167 ImmutableOopMapSet* oms = oop_maps(); 3168 if (oms != nullptr) { 3169 for (int i = 0, imax = oms->count(); i < imax; i++) { 3170 const ImmutableOopMapPair* pair = oms->pair_at(i); 3171 const ImmutableOopMap* om = pair->get_from(oms); 3172 address pc = base + pair->pc_offset(); 3173 if (pc >= begin) { 3174 #if INCLUDE_JVMCI 3175 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset(); 3176 #else 3177 bool is_implicit_deopt = false; 3178 #endif 3179 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) { 3180 st->move_to(column, 6, 0); 3181 st->print("; "); 3182 om->print_on(st); 3183 oop_map_required = false; 3184 } 3185 } 3186 if (pc > end) { 3187 break; 3188 } 3189 } 3190 } 3191 assert(!oop_map_required, "missed oopmap"); 3192 3193 Thread* thread = Thread::current(); 3194 3195 // Print any debug info present at this pc. 3196 ScopeDesc* sd = scope_desc_in(begin, end); 3197 if (sd != nullptr) { 3198 st->move_to(column, 6, 0); 3199 if (sd->bci() == SynchronizationEntryBCI) { 3200 st->print(";*synchronization entry"); 3201 } else if (sd->bci() == AfterBci) { 3202 st->print(";* method exit (unlocked if synchronized)"); 3203 } else if (sd->bci() == UnwindBci) { 3204 st->print(";* unwind (locked if synchronized)"); 3205 } else if (sd->bci() == AfterExceptionBci) { 3206 st->print(";* unwind (unlocked if synchronized)"); 3207 } else if (sd->bci() == UnknownBci) { 3208 st->print(";* unknown"); 3209 } else if (sd->bci() == InvalidFrameStateBci) { 3210 st->print(";* invalid frame state"); 3211 } else { 3212 if (sd->method() == nullptr) { 3213 st->print("method is nullptr"); 3214 } else if (sd->method()->is_native()) { 3215 st->print("method is native"); 3216 } else { 3217 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3218 st->print(";*%s", Bytecodes::name(bc)); 3219 switch (bc) { 3220 case Bytecodes::_invokevirtual: 3221 case Bytecodes::_invokespecial: 3222 case Bytecodes::_invokestatic: 3223 case Bytecodes::_invokeinterface: 3224 { 3225 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci()); 3226 st->print(" "); 3227 if (invoke.name() != nullptr) 3228 invoke.name()->print_symbol_on(st); 3229 else 3230 st->print("<UNKNOWN>"); 3231 break; 3232 } 3233 case Bytecodes::_getfield: 3234 case Bytecodes::_putfield: 3235 case Bytecodes::_getstatic: 3236 case Bytecodes::_putstatic: 3237 { 3238 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci()); 3239 st->print(" "); 3240 if (field.name() != nullptr) 3241 field.name()->print_symbol_on(st); 3242 else 3243 st->print("<UNKNOWN>"); 3244 } 3245 default: 3246 break; 3247 } 3248 } 3249 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3250 } 3251 3252 // Print all scopes 3253 for (;sd != nullptr; sd = sd->sender()) { 3254 st->move_to(column, 6, 0); 3255 st->print("; -"); 3256 if (sd->should_reexecute()) { 3257 st->print(" (reexecute)"); 3258 } 3259 if (sd->method() == nullptr) { 3260 st->print("method is nullptr"); 3261 } else { 3262 sd->method()->print_short_name(st); 3263 } 3264 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3265 if (lineno != -1) { 3266 st->print("@%d (line %d)", sd->bci(), lineno); 3267 } else { 3268 st->print("@%d", sd->bci()); 3269 } 3270 st->cr(); 3271 } 3272 } 3273 3274 // Print relocation information 3275 // Prevent memory leak: allocating without ResourceMark. 3276 ResourceMark rm; 3277 const char* str = reloc_string_for(begin, end); 3278 if (str != nullptr) { 3279 if (sd != nullptr) st->cr(); 3280 st->move_to(column, 6, 0); 3281 st->print("; {%s}", str); 3282 } 3283 } 3284 3285 #endif 3286 3287 class DirectNativeCallWrapper: public NativeCallWrapper { 3288 private: 3289 NativeCall* _call; 3290 3291 public: 3292 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 3293 3294 virtual address destination() const { return _call->destination(); } 3295 virtual address instruction_address() const { return _call->instruction_address(); } 3296 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 3297 virtual address return_address() const { return _call->return_address(); } 3298 3299 virtual address get_resolve_call_stub(bool is_optimized) const { 3300 if (is_optimized) { 3301 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 3302 } 3303 return SharedRuntime::get_resolve_virtual_call_stub(); 3304 } 3305 3306 virtual void set_destination_mt_safe(address dest) { 3307 _call->set_destination_mt_safe(dest); 3308 } 3309 3310 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 3311 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3312 { 3313 csc->set_to_interpreted(method, info.entry()); 3314 } 3315 } 3316 3317 virtual void verify() const { 3318 // make sure code pattern is actually a call imm32 instruction 3319 _call->verify(); 3320 _call->verify_alignment(); 3321 } 3322 3323 virtual void verify_resolve_call(address dest) const { 3324 CodeBlob* db = CodeCache::find_blob(dest); 3325 assert(db != nullptr && !db->is_adapter_blob(), "must use stub!"); 3326 } 3327 3328 virtual bool is_call_to_interpreted(address dest) const { 3329 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 3330 return cb->contains(dest); 3331 } 3332 3333 virtual bool is_safe_for_patching() const { return false; } 3334 3335 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 3336 return nativeMovConstReg_at(r->cached_value()); 3337 } 3338 3339 virtual void *get_data(NativeInstruction* instruction) const { 3340 return (void*)((NativeMovConstReg*) instruction)->data(); 3341 } 3342 3343 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 3344 ((NativeMovConstReg*) instruction)->set_data(data); 3345 } 3346 }; 3347 3348 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 3349 return new DirectNativeCallWrapper((NativeCall*) call); 3350 } 3351 3352 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 3353 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 3354 } 3355 3356 address nmethod::call_instruction_address(address pc) const { 3357 if (NativeCall::is_call_before(pc)) { 3358 NativeCall *ncall = nativeCall_before(pc); 3359 return ncall->instruction_address(); 3360 } 3361 return nullptr; 3362 } 3363 3364 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 3365 return CompiledDirectStaticCall::at(call_site); 3366 } 3367 3368 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 3369 return CompiledDirectStaticCall::at(call_site); 3370 } 3371 3372 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 3373 return CompiledDirectStaticCall::before(return_addr); 3374 } 3375 3376 #if defined(SUPPORT_DATA_STRUCTS) 3377 void nmethod::print_value_on(outputStream* st) const { 3378 st->print("nmethod"); 3379 print_on(st, nullptr); 3380 } 3381 #endif 3382 3383 #ifndef PRODUCT 3384 3385 void nmethod::print_calls(outputStream* st) { 3386 RelocIterator iter(this); 3387 while (iter.next()) { 3388 switch (iter.type()) { 3389 case relocInfo::virtual_call_type: 3390 case relocInfo::opt_virtual_call_type: { 3391 CompiledICLocker ml_verify(this); 3392 CompiledIC_at(&iter)->print(); 3393 break; 3394 } 3395 case relocInfo::static_call_type: 3396 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3397 CompiledDirectStaticCall::at(iter.reloc())->print(); 3398 break; 3399 default: 3400 break; 3401 } 3402 } 3403 } 3404 3405 void nmethod::print_statistics() { 3406 ttyLocker ttyl; 3407 if (xtty != nullptr) xtty->head("statistics type='nmethod'"); 3408 native_nmethod_stats.print_native_nmethod_stats(); 3409 #ifdef COMPILER1 3410 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3411 #endif 3412 #ifdef COMPILER2 3413 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3414 #endif 3415 #if INCLUDE_JVMCI 3416 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3417 #endif 3418 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3419 DebugInformationRecorder::print_statistics(); 3420 #ifndef PRODUCT 3421 pc_nmethod_stats.print_pc_stats(); 3422 #endif 3423 Dependencies::print_statistics(); 3424 if (xtty != nullptr) xtty->tail("statistics"); 3425 } 3426 3427 #endif // !PRODUCT 3428 3429 #if INCLUDE_JVMCI 3430 void nmethod::update_speculation(JavaThread* thread) { 3431 jlong speculation = thread->pending_failed_speculation(); 3432 if (speculation != 0) { 3433 guarantee(jvmci_nmethod_data() != nullptr, "failed speculation in nmethod without failed speculation list"); 3434 jvmci_nmethod_data()->add_failed_speculation(this, speculation); 3435 thread->set_pending_failed_speculation(0); 3436 } 3437 } 3438 3439 const char* nmethod::jvmci_name() { 3440 if (jvmci_nmethod_data() != nullptr) { 3441 return jvmci_nmethod_data()->name(); 3442 } 3443 return nullptr; 3444 } 3445 #endif