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