1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "asm/assembler.inline.hpp" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/compiledMethod.inline.hpp" 30 #include "code/dependencies.hpp" 31 #include "code/nativeInst.hpp" 32 #include "code/nmethod.hpp" 33 #include "code/scopeDesc.hpp" 34 #include "compiler/abstractCompiler.hpp" 35 #include "compiler/compilationLog.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "compiler/compileLog.hpp" 38 #include "compiler/compileTask.hpp" 39 #include "compiler/compilerDirectives.hpp" 40 #include "compiler/directivesParser.hpp" 41 #include "compiler/disassembler.hpp" 42 #include "compiler/oopMap.inline.hpp" 43 #include "gc/shared/barrierSet.hpp" 44 #include "gc/shared/barrierSetNMethod.hpp" 45 #include "gc/shared/collectedHeap.hpp" 46 #include "interpreter/bytecode.hpp" 47 #include "jvm.h" 48 #include "logging/log.hpp" 49 #include "logging/logStream.hpp" 50 #include "memory/allocation.inline.hpp" 51 #include "memory/resourceArea.hpp" 52 #include "memory/universe.hpp" 53 #include "oops/access.inline.hpp" 54 #include "oops/klass.inline.hpp" 55 #include "oops/method.inline.hpp" 56 #include "oops/methodData.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/weakHandle.inline.hpp" 59 #include "prims/jvmtiImpl.hpp" 60 #include "prims/jvmtiThreadState.hpp" 61 #include "prims/methodHandles.hpp" 62 #include "runtime/continuation.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/deoptimization.hpp" 65 #include "runtime/flags/flagSetting.hpp" 66 #include "runtime/frame.inline.hpp" 67 #include "runtime/handles.inline.hpp" 68 #include "runtime/jniHandles.inline.hpp" 69 #include "runtime/orderAccess.hpp" 70 #include "runtime/os.hpp" 71 #include "runtime/safepointVerifiers.hpp" 72 #include "runtime/serviceThread.hpp" 73 #include "runtime/sharedRuntime.hpp" 74 #include "runtime/signature.hpp" 75 #include "runtime/threadWXSetters.inline.hpp" 76 #include "runtime/vmThread.hpp" 77 #include "utilities/align.hpp" 78 #include "utilities/copy.hpp" 79 #include "utilities/dtrace.hpp" 80 #include "utilities/events.hpp" 81 #include "utilities/globalDefinitions.hpp" 82 #include "utilities/resourceHash.hpp" 83 #include "utilities/xmlstream.hpp" 84 #if INCLUDE_JVMCI 85 #include "jvmci/jvmciRuntime.hpp" 86 #endif 87 88 #ifdef DTRACE_ENABLED 89 90 // Only bother with this argument setup if dtrace is available 91 92 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 93 { \ 94 Method* m = (method); \ 95 if (m != NULL) { \ 96 Symbol* klass_name = m->klass_name(); \ 97 Symbol* name = m->name(); \ 98 Symbol* signature = m->signature(); \ 99 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 100 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 101 (char *) name->bytes(), name->utf8_length(), \ 102 (char *) signature->bytes(), signature->utf8_length()); \ 103 } \ 104 } 105 106 #else // ndef DTRACE_ENABLED 107 108 #define DTRACE_METHOD_UNLOAD_PROBE(method) 109 110 #endif 111 112 //--------------------------------------------------------------------------------- 113 // NMethod statistics 114 // They are printed under various flags, including: 115 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 116 // (In the latter two cases, they like other stats are printed to the log only.) 117 118 #ifndef PRODUCT 119 // These variables are put into one block to reduce relocations 120 // and make it simpler to print from the debugger. 121 struct java_nmethod_stats_struct { 122 int nmethod_count; 123 int total_size; 124 int relocation_size; 125 int consts_size; 126 int insts_size; 127 int stub_size; 128 int scopes_data_size; 129 int scopes_pcs_size; 130 int dependencies_size; 131 int handler_table_size; 132 int nul_chk_table_size; 133 #if INCLUDE_JVMCI 134 int speculations_size; 135 int jvmci_data_size; 136 #endif 137 int oops_size; 138 int metadata_size; 139 140 void note_nmethod(nmethod* nm) { 141 nmethod_count += 1; 142 total_size += nm->size(); 143 relocation_size += nm->relocation_size(); 144 consts_size += nm->consts_size(); 145 insts_size += nm->insts_size(); 146 stub_size += nm->stub_size(); 147 oops_size += nm->oops_size(); 148 metadata_size += nm->metadata_size(); 149 scopes_data_size += nm->scopes_data_size(); 150 scopes_pcs_size += nm->scopes_pcs_size(); 151 dependencies_size += nm->dependencies_size(); 152 handler_table_size += nm->handler_table_size(); 153 nul_chk_table_size += nm->nul_chk_table_size(); 154 #if INCLUDE_JVMCI 155 speculations_size += nm->speculations_size(); 156 jvmci_data_size += nm->jvmci_data_size(); 157 #endif 158 } 159 void print_nmethod_stats(const char* name) { 160 if (nmethod_count == 0) return; 161 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 162 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 163 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 164 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 165 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 166 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 167 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 168 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 169 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 170 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 171 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 172 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 173 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 174 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 175 #if INCLUDE_JVMCI 176 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size); 177 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size); 178 #endif 179 } 180 }; 181 182 struct native_nmethod_stats_struct { 183 int native_nmethod_count; 184 int native_total_size; 185 int native_relocation_size; 186 int native_insts_size; 187 int native_oops_size; 188 int native_metadata_size; 189 void note_native_nmethod(nmethod* nm) { 190 native_nmethod_count += 1; 191 native_total_size += nm->size(); 192 native_relocation_size += nm->relocation_size(); 193 native_insts_size += nm->insts_size(); 194 native_oops_size += nm->oops_size(); 195 native_metadata_size += nm->metadata_size(); 196 } 197 void print_native_nmethod_stats() { 198 if (native_nmethod_count == 0) return; 199 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 200 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 201 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 202 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 203 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 204 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 205 } 206 }; 207 208 struct pc_nmethod_stats_struct { 209 int pc_desc_resets; // number of resets (= number of caches) 210 int pc_desc_queries; // queries to nmethod::find_pc_desc 211 int pc_desc_approx; // number of those which have approximate true 212 int pc_desc_repeats; // number of _pc_descs[0] hits 213 int pc_desc_hits; // number of LRU cache hits 214 int pc_desc_tests; // total number of PcDesc examinations 215 int pc_desc_searches; // total number of quasi-binary search steps 216 int pc_desc_adds; // number of LUR cache insertions 217 218 void print_pc_stats() { 219 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 220 pc_desc_queries, 221 (double)(pc_desc_tests + pc_desc_searches) 222 / pc_desc_queries); 223 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 224 pc_desc_resets, 225 pc_desc_queries, pc_desc_approx, 226 pc_desc_repeats, pc_desc_hits, 227 pc_desc_tests, pc_desc_searches, pc_desc_adds); 228 } 229 }; 230 231 #ifdef COMPILER1 232 static java_nmethod_stats_struct c1_java_nmethod_stats; 233 #endif 234 #ifdef COMPILER2 235 static java_nmethod_stats_struct c2_java_nmethod_stats; 236 #endif 237 #if INCLUDE_JVMCI 238 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 239 #endif 240 static java_nmethod_stats_struct unknown_java_nmethod_stats; 241 242 static native_nmethod_stats_struct native_nmethod_stats; 243 static pc_nmethod_stats_struct pc_nmethod_stats; 244 245 static void note_java_nmethod(nmethod* nm) { 246 #ifdef COMPILER1 247 if (nm->is_compiled_by_c1()) { 248 c1_java_nmethod_stats.note_nmethod(nm); 249 } else 250 #endif 251 #ifdef COMPILER2 252 if (nm->is_compiled_by_c2()) { 253 c2_java_nmethod_stats.note_nmethod(nm); 254 } else 255 #endif 256 #if INCLUDE_JVMCI 257 if (nm->is_compiled_by_jvmci()) { 258 jvmci_java_nmethod_stats.note_nmethod(nm); 259 } else 260 #endif 261 { 262 unknown_java_nmethod_stats.note_nmethod(nm); 263 } 264 } 265 #endif // !PRODUCT 266 267 //--------------------------------------------------------------------------------- 268 269 270 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 271 assert(pc != NULL, "Must be non null"); 272 assert(exception.not_null(), "Must be non null"); 273 assert(handler != NULL, "Must be non null"); 274 275 _count = 0; 276 _exception_type = exception->klass(); 277 _next = NULL; 278 _purge_list_next = NULL; 279 280 add_address_and_handler(pc,handler); 281 } 282 283 284 address ExceptionCache::match(Handle exception, address pc) { 285 assert(pc != NULL,"Must be non null"); 286 assert(exception.not_null(),"Must be non null"); 287 if (exception->klass() == exception_type()) { 288 return (test_address(pc)); 289 } 290 291 return NULL; 292 } 293 294 295 bool ExceptionCache::match_exception_with_space(Handle exception) { 296 assert(exception.not_null(),"Must be non null"); 297 if (exception->klass() == exception_type() && count() < cache_size) { 298 return true; 299 } 300 return false; 301 } 302 303 304 address ExceptionCache::test_address(address addr) { 305 int limit = count(); 306 for (int i = 0; i < limit; i++) { 307 if (pc_at(i) == addr) { 308 return handler_at(i); 309 } 310 } 311 return NULL; 312 } 313 314 315 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 316 if (test_address(addr) == handler) return true; 317 318 int index = count(); 319 if (index < cache_size) { 320 set_pc_at(index, addr); 321 set_handler_at(index, handler); 322 increment_count(); 323 return true; 324 } 325 return false; 326 } 327 328 ExceptionCache* ExceptionCache::next() { 329 return Atomic::load(&_next); 330 } 331 332 void ExceptionCache::set_next(ExceptionCache *ec) { 333 Atomic::store(&_next, ec); 334 } 335 336 //----------------------------------------------------------------------------- 337 338 339 // Helper used by both find_pc_desc methods. 340 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 341 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 342 if (!approximate) 343 return pc->pc_offset() == pc_offset; 344 else 345 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 346 } 347 348 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 349 if (initial_pc_desc == NULL) { 350 _pc_descs[0] = NULL; // native method; no PcDescs at all 351 return; 352 } 353 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 354 // reset the cache by filling it with benign (non-null) values 355 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 356 for (int i = 0; i < cache_size; i++) 357 _pc_descs[i] = initial_pc_desc; 358 } 359 360 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 361 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 362 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 363 364 // Note: one might think that caching the most recently 365 // read value separately would be a win, but one would be 366 // wrong. When many threads are updating it, the cache 367 // line it's in would bounce between caches, negating 368 // any benefit. 369 370 // In order to prevent race conditions do not load cache elements 371 // repeatedly, but use a local copy: 372 PcDesc* res; 373 374 // Step one: Check the most recently added value. 375 res = _pc_descs[0]; 376 if (res == NULL) return NULL; // native method; no PcDescs at all 377 if (match_desc(res, pc_offset, approximate)) { 378 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 379 return res; 380 } 381 382 // Step two: Check the rest of the LRU cache. 383 for (int i = 1; i < cache_size; ++i) { 384 res = _pc_descs[i]; 385 if (res->pc_offset() < 0) break; // optimization: skip empty cache 386 if (match_desc(res, pc_offset, approximate)) { 387 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 388 return res; 389 } 390 } 391 392 // Report failure. 393 return NULL; 394 } 395 396 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 397 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 398 // Update the LRU cache by shifting pc_desc forward. 399 for (int i = 0; i < cache_size; i++) { 400 PcDesc* next = _pc_descs[i]; 401 _pc_descs[i] = pc_desc; 402 pc_desc = next; 403 } 404 } 405 406 // adjust pcs_size so that it is a multiple of both oopSize and 407 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 408 // of oopSize, then 2*sizeof(PcDesc) is) 409 static int adjust_pcs_size(int pcs_size) { 410 int nsize = align_up(pcs_size, oopSize); 411 if ((nsize % sizeof(PcDesc)) != 0) { 412 nsize = pcs_size + sizeof(PcDesc); 413 } 414 assert((nsize % oopSize) == 0, "correct alignment"); 415 return nsize; 416 } 417 418 419 int nmethod::total_size() const { 420 return 421 consts_size() + 422 insts_size() + 423 stub_size() + 424 scopes_data_size() + 425 scopes_pcs_size() + 426 handler_table_size() + 427 nul_chk_table_size(); 428 } 429 430 const char* nmethod::compile_kind() const { 431 if (is_osr_method()) return "osr"; 432 if (method() != NULL && is_native_method()) { 433 if (method()->is_continuation_native_intrinsic()) { 434 return "cnt"; 435 } 436 return "c2n"; 437 } 438 return NULL; 439 } 440 441 // Fill in default values for various flag fields 442 void nmethod::init_defaults() { 443 _state = not_installed; 444 _has_flushed_dependencies = 0; 445 _load_reported = false; // jvmti state 446 447 _oops_do_mark_link = NULL; 448 _osr_link = NULL; 449 #if INCLUDE_RTM_OPT 450 _rtm_state = NoRTM; 451 #endif 452 } 453 454 #ifdef ASSERT 455 class CheckForOopsClosure : public OopClosure { 456 bool _found_oop = false; 457 public: 458 virtual void do_oop(oop* o) { _found_oop = true; } 459 virtual void do_oop(narrowOop* o) { _found_oop = true; } 460 bool found_oop() { return _found_oop; } 461 }; 462 class CheckForMetadataClosure : public MetadataClosure { 463 bool _found_metadata = false; 464 Metadata* _ignore = nullptr; 465 public: 466 CheckForMetadataClosure(Metadata* ignore) : _ignore(ignore) {} 467 virtual void do_metadata(Metadata* md) { if (md != _ignore) _found_metadata = true; } 468 bool found_metadata() { return _found_metadata; } 469 }; 470 471 static void assert_no_oops_or_metadata(nmethod* nm) { 472 if (nm == nullptr) return; 473 assert(nm->oop_maps() == nullptr, "expectation"); 474 475 CheckForOopsClosure cfo; 476 nm->oops_do(&cfo); 477 assert(!cfo.found_oop(), "no oops allowed"); 478 479 // We allow an exception for the own Method, but require its class to be permanent. 480 Method* own_method = nm->method(); 481 CheckForMetadataClosure cfm(/* ignore reference to own Method */ own_method); 482 nm->metadata_do(&cfm); 483 assert(!cfm.found_metadata(), "no metadata allowed"); 484 485 assert(own_method->method_holder()->class_loader_data()->is_permanent_class_loader_data(), 486 "Method's class needs to be permanent"); 487 } 488 #endif 489 490 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 491 int compile_id, 492 CodeBuffer *code_buffer, 493 int vep_offset, 494 int frame_complete, 495 int frame_size, 496 ByteSize basic_lock_owner_sp_offset, 497 ByteSize basic_lock_sp_offset, 498 OopMapSet* oop_maps, 499 int exception_handler) { 500 code_buffer->finalize_oop_references(method); 501 // create nmethod 502 nmethod* nm = NULL; 503 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 504 { 505 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 506 507 CodeOffsets offsets; 508 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 509 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 510 if (exception_handler != -1) { 511 offsets.set_value(CodeOffsets::Exceptions, exception_handler); 512 } 513 514 // MH intrinsics are dispatch stubs which are compatible with NonNMethod space. 515 // IsUnloadingBehaviour::is_unloading needs to handle them separately. 516 bool allow_NonNMethod_space = method->can_be_allocated_in_NonNMethod_space(); 517 nm = new (native_nmethod_size, allow_NonNMethod_space) 518 nmethod(method(), compiler_none, native_nmethod_size, 519 compile_id, &offsets, 520 code_buffer, frame_size, 521 basic_lock_owner_sp_offset, 522 basic_lock_sp_offset, 523 oop_maps); 524 DEBUG_ONLY( if (allow_NonNMethod_space) assert_no_oops_or_metadata(nm); ) 525 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 526 } 527 528 if (nm != NULL) { 529 // verify nmethod 530 debug_only(nm->verify();) // might block 531 532 nm->log_new_nmethod(); 533 } 534 return nm; 535 } 536 537 nmethod* nmethod::new_nmethod(const methodHandle& method, 538 int compile_id, 539 int entry_bci, 540 CodeOffsets* offsets, 541 int orig_pc_offset, 542 DebugInformationRecorder* debug_info, 543 Dependencies* dependencies, 544 CodeBuffer* code_buffer, int frame_size, 545 OopMapSet* oop_maps, 546 ExceptionHandlerTable* handler_table, 547 ImplicitExceptionTable* nul_chk_table, 548 AbstractCompiler* compiler, 549 CompLevel comp_level 550 #if INCLUDE_JVMCI 551 , char* speculations, 552 int speculations_len, 553 int nmethod_mirror_index, 554 const char* nmethod_mirror_name, 555 FailedSpeculation** failed_speculations 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 = NULL; 563 #if INCLUDE_JVMCI 564 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name); 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_size 592 #endif 593 ); 594 595 if (nm != NULL) { 596 #if INCLUDE_JVMCI 597 if (compiler->is_jvmci()) { 598 // Initialize the JVMCINMethodData object inlined into nm 599 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations); 600 } 601 #endif 602 // To make dependency checking during class loading fast, record 603 // the nmethod dependencies in the classes it is dependent on. 604 // This allows the dependency checking code to simply walk the 605 // class hierarchy above the loaded class, checking only nmethods 606 // which are dependent on those classes. The slow way is to 607 // check every nmethod for dependencies which makes it linear in 608 // the number of methods compiled. For applications with a lot 609 // classes the slow way is too slow. 610 for (Dependencies::DepStream deps(nm); deps.next(); ) { 611 if (deps.type() == Dependencies::call_site_target_value) { 612 // CallSite dependencies are managed on per-CallSite instance basis. 613 oop call_site = deps.argument_oop(0); 614 MethodHandles::add_dependent_nmethod(call_site, nm); 615 } else { 616 Klass* klass = deps.context_type(); 617 if (klass == NULL) { 618 continue; // ignore things like evol_method 619 } 620 // record this nmethod as dependent on this klass 621 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 622 } 623 } 624 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 625 } 626 } 627 // Do verification and logging outside CodeCache_lock. 628 if (nm != NULL) { 629 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 630 DEBUG_ONLY(nm->verify();) 631 nm->log_new_nmethod(); 632 } 633 return nm; 634 } 635 636 // For native wrappers 637 nmethod::nmethod( 638 Method* method, 639 CompilerType type, 640 int nmethod_size, 641 int compile_id, 642 CodeOffsets* offsets, 643 CodeBuffer* code_buffer, 644 int frame_size, 645 ByteSize basic_lock_owner_sp_offset, 646 ByteSize basic_lock_sp_offset, 647 OopMapSet* oop_maps ) 648 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true), 649 _unlinked_next(NULL), 650 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 651 _native_basic_lock_sp_offset(basic_lock_sp_offset), 652 _is_unloading_state(0) 653 { 654 { 655 int scopes_data_offset = 0; 656 int deoptimize_offset = 0; 657 int deoptimize_mh_offset = 0; 658 659 debug_only(NoSafepointVerifier nsv;) 660 assert_locked_or_safepoint(CodeCache_lock); 661 662 init_defaults(); 663 _comp_level = CompLevel_none; 664 _entry_bci = InvocationEntryBci; 665 // We have no exception handler or deopt handler make the 666 // values something that will never match a pc like the nmethod vtable entry 667 _exception_offset = 0; 668 _orig_pc_offset = 0; 669 _gc_epoch = CodeCache::gc_epoch(); 670 671 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 672 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 673 _oops_offset = data_offset(); 674 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 675 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 676 _scopes_pcs_offset = scopes_data_offset; 677 _dependencies_offset = _scopes_pcs_offset; 678 _handler_table_offset = _dependencies_offset; 679 _nul_chk_table_offset = _handler_table_offset; 680 #if INCLUDE_JVMCI 681 _speculations_offset = _nul_chk_table_offset; 682 _jvmci_data_offset = _speculations_offset; 683 _nmethod_end_offset = _jvmci_data_offset; 684 #else 685 _nmethod_end_offset = _nul_chk_table_offset; 686 #endif 687 _compile_id = compile_id; 688 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 689 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 690 691 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); // for the next 3 fields 692 _inline_entry_point = _entry_point; 693 _verified_inline_entry_point = _verified_entry_point; 694 _verified_inline_ro_entry_point = _verified_entry_point; 695 696 _osr_entry_point = NULL; 697 _exception_cache = NULL; 698 _pc_desc_container.reset_to(NULL); 699 700 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 701 702 _scopes_data_begin = (address) this + scopes_data_offset; 703 _deopt_handler_begin = (address) this + deoptimize_offset; 704 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 705 706 code_buffer->copy_code_and_locs_to(this); 707 code_buffer->copy_values_to(this); 708 709 clear_unloading_state(); 710 711 Universe::heap()->register_nmethod(this); 712 debug_only(Universe::heap()->verify_nmethod(this)); 713 714 CodeCache::commit(this); 715 716 finalize_relocations(); 717 } 718 719 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 720 ttyLocker ttyl; // keep the following output all in one block 721 // This output goes directly to the tty, not the compiler log. 722 // To enable tools to match it up with the compilation activity, 723 // be sure to tag this tty output with the compile ID. 724 if (xtty != NULL) { 725 xtty->begin_head("print_native_nmethod"); 726 xtty->method(_method); 727 xtty->stamp(); 728 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 729 } 730 // Print the header part, then print the requested information. 731 // This is both handled in decode2(), called via print_code() -> decode() 732 if (PrintNativeNMethods) { 733 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------"); 734 print_code(); 735 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 736 #if defined(SUPPORT_DATA_STRUCTS) 737 if (AbstractDisassembler::show_structs()) { 738 if (oop_maps != NULL) { 739 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning 740 oop_maps->print_on(tty); 741 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 742 } 743 } 744 #endif 745 } else { 746 print(); // print the header part only. 747 } 748 #if defined(SUPPORT_DATA_STRUCTS) 749 if (AbstractDisassembler::show_structs()) { 750 if (PrintRelocations) { 751 print_relocations(); 752 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 753 } 754 } 755 #endif 756 if (xtty != NULL) { 757 xtty->tail("print_native_nmethod"); 758 } 759 } 760 } 761 762 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 763 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 764 } 765 766 void* nmethod::operator new(size_t size, int nmethod_size, bool allow_NonNMethod_space) throw () { 767 // Try MethodNonProfiled and MethodProfiled. 768 void* return_value = CodeCache::allocate(nmethod_size, CodeBlobType::MethodNonProfiled); 769 if (return_value != nullptr || !allow_NonNMethod_space) return return_value; 770 // Try NonNMethod or give up. 771 return CodeCache::allocate(nmethod_size, CodeBlobType::NonNMethod); 772 } 773 774 nmethod::nmethod( 775 Method* method, 776 CompilerType type, 777 int nmethod_size, 778 int compile_id, 779 int entry_bci, 780 CodeOffsets* offsets, 781 int orig_pc_offset, 782 DebugInformationRecorder* debug_info, 783 Dependencies* dependencies, 784 CodeBuffer *code_buffer, 785 int frame_size, 786 OopMapSet* oop_maps, 787 ExceptionHandlerTable* handler_table, 788 ImplicitExceptionTable* nul_chk_table, 789 AbstractCompiler* compiler, 790 CompLevel comp_level 791 #if INCLUDE_JVMCI 792 , char* speculations, 793 int speculations_len, 794 int jvmci_data_size 795 #endif 796 ) 797 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false, true), 798 _unlinked_next(NULL), 799 _native_receiver_sp_offset(in_ByteSize(-1)), 800 _native_basic_lock_sp_offset(in_ByteSize(-1)), 801 _is_unloading_state(0) 802 { 803 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 804 { 805 debug_only(NoSafepointVerifier nsv;) 806 assert_locked_or_safepoint(CodeCache_lock); 807 808 _deopt_handler_begin = (address) this; 809 _deopt_mh_handler_begin = (address) this; 810 811 init_defaults(); 812 _entry_bci = entry_bci; 813 _compile_id = compile_id; 814 _comp_level = comp_level; 815 _orig_pc_offset = orig_pc_offset; 816 _gc_epoch = CodeCache::gc_epoch(); 817 818 // Section offsets 819 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 820 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 821 set_ctable_begin(header_begin() + _consts_offset); 822 823 #if INCLUDE_JVMCI 824 if (compiler->is_jvmci()) { 825 // JVMCI might not produce any stub sections 826 if (offsets->value(CodeOffsets::Exceptions) != -1) { 827 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 828 } else { 829 _exception_offset = -1; 830 } 831 if (offsets->value(CodeOffsets::Deopt) != -1) { 832 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 833 } else { 834 _deopt_handler_begin = NULL; 835 } 836 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 837 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 838 } else { 839 _deopt_mh_handler_begin = NULL; 840 } 841 } else 842 #endif 843 { 844 // Exception handler and deopt handler are in the stub section 845 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 846 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 847 848 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 849 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 850 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 851 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 852 } else { 853 _deopt_mh_handler_begin = NULL; 854 } 855 } 856 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 857 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 858 } else { 859 _unwind_handler_offset = -1; 860 } 861 862 _oops_offset = data_offset(); 863 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 864 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 865 866 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 867 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 868 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize); 869 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 870 #if INCLUDE_JVMCI 871 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 872 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize); 873 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); 874 #else 875 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 876 #endif 877 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 878 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 879 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry); 880 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry); 881 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO); 882 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 883 _exception_cache = NULL; 884 _scopes_data_begin = (address) this + scopes_data_offset; 885 886 _pc_desc_container.reset_to(scopes_pcs_begin()); 887 888 code_buffer->copy_code_and_locs_to(this); 889 // Copy contents of ScopeDescRecorder to nmethod 890 code_buffer->copy_values_to(this); 891 debug_info->copy_to(this); 892 dependencies->copy_to(this); 893 clear_unloading_state(); 894 895 Universe::heap()->register_nmethod(this); 896 debug_only(Universe::heap()->verify_nmethod(this)); 897 898 CodeCache::commit(this); 899 900 finalize_relocations(); 901 902 // Copy contents of ExceptionHandlerTable to nmethod 903 handler_table->copy_to(this); 904 nul_chk_table->copy_to(this); 905 906 #if INCLUDE_JVMCI 907 // Copy speculations to nmethod 908 if (speculations_size() != 0) { 909 memcpy(speculations_begin(), speculations, speculations_len); 910 } 911 #endif 912 913 // we use the information of entry points to find out if a method is 914 // static or non static 915 assert(compiler->is_c2() || compiler->is_jvmci() || 916 _method->is_static() == (entry_point() == _verified_entry_point), 917 " entry points must be same for static methods and vice versa"); 918 } 919 } 920 921 // Print a short set of xml attributes to identify this nmethod. The 922 // output should be embedded in some other element. 923 void nmethod::log_identity(xmlStream* log) const { 924 log->print(" compile_id='%d'", compile_id()); 925 const char* nm_kind = compile_kind(); 926 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 927 log->print(" compiler='%s'", compiler_name()); 928 if (TieredCompilation) { 929 log->print(" level='%d'", comp_level()); 930 } 931 #if INCLUDE_JVMCI 932 if (jvmci_nmethod_data() != NULL) { 933 const char* jvmci_name = jvmci_nmethod_data()->name(); 934 if (jvmci_name != NULL) { 935 log->print(" jvmci_mirror_name='"); 936 log->text("%s", jvmci_name); 937 log->print("'"); 938 } 939 } 940 #endif 941 } 942 943 944 #define LOG_OFFSET(log, name) \ 945 if (p2i(name##_end()) - p2i(name##_begin())) \ 946 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 947 p2i(name##_begin()) - p2i(this)) 948 949 950 void nmethod::log_new_nmethod() const { 951 if (LogCompilation && xtty != NULL) { 952 ttyLocker ttyl; 953 xtty->begin_elem("nmethod"); 954 log_identity(xtty); 955 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 956 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 957 958 LOG_OFFSET(xtty, relocation); 959 LOG_OFFSET(xtty, consts); 960 LOG_OFFSET(xtty, insts); 961 LOG_OFFSET(xtty, stub); 962 LOG_OFFSET(xtty, scopes_data); 963 LOG_OFFSET(xtty, scopes_pcs); 964 LOG_OFFSET(xtty, dependencies); 965 LOG_OFFSET(xtty, handler_table); 966 LOG_OFFSET(xtty, nul_chk_table); 967 LOG_OFFSET(xtty, oops); 968 LOG_OFFSET(xtty, metadata); 969 970 xtty->method(method()); 971 xtty->stamp(); 972 xtty->end_elem(); 973 } 974 } 975 976 #undef LOG_OFFSET 977 978 979 // Print out more verbose output usually for a newly created nmethod. 980 void nmethod::print_on(outputStream* st, const char* msg) const { 981 if (st != NULL) { 982 ttyLocker ttyl; 983 if (WizardMode) { 984 CompileTask::print(st, this, msg, /*short_form:*/ true); 985 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 986 } else { 987 CompileTask::print(st, this, msg, /*short_form:*/ false); 988 } 989 } 990 } 991 992 void nmethod::maybe_print_nmethod(const DirectiveSet* directive) { 993 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 994 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 995 print_nmethod(printnmethods); 996 } 997 } 998 999 void nmethod::print_nmethod(bool printmethod) { 1000 ttyLocker ttyl; // keep the following output all in one block 1001 if (xtty != NULL) { 1002 xtty->begin_head("print_nmethod"); 1003 log_identity(xtty); 1004 xtty->stamp(); 1005 xtty->end_head(); 1006 } 1007 // Print the header part, then print the requested information. 1008 // This is both handled in decode2(). 1009 if (printmethod) { 1010 ResourceMark m; 1011 if (is_compiled_by_c1()) { 1012 tty->cr(); 1013 tty->print_cr("============================= C1-compiled nmethod =============================="); 1014 } 1015 if (is_compiled_by_jvmci()) { 1016 tty->cr(); 1017 tty->print_cr("=========================== JVMCI-compiled nmethod ============================="); 1018 } 1019 tty->print_cr("----------------------------------- Assembly -----------------------------------"); 1020 decode2(tty); 1021 #if defined(SUPPORT_DATA_STRUCTS) 1022 if (AbstractDisassembler::show_structs()) { 1023 // Print the oops from the underlying CodeBlob as well. 1024 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1025 print_oops(tty); 1026 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1027 print_metadata(tty); 1028 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1029 print_pcs(); 1030 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1031 if (oop_maps() != NULL) { 1032 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning 1033 oop_maps()->print_on(tty); 1034 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1035 } 1036 } 1037 #endif 1038 } else { 1039 print(); // print the header part only. 1040 } 1041 1042 #if defined(SUPPORT_DATA_STRUCTS) 1043 if (AbstractDisassembler::show_structs()) { 1044 methodHandle mh(Thread::current(), _method); 1045 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) { 1046 print_scopes(); 1047 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1048 } 1049 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) { 1050 print_relocations(); 1051 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1052 } 1053 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) { 1054 print_dependencies(); 1055 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1056 } 1057 if (printmethod || PrintExceptionHandlers) { 1058 print_handler_table(); 1059 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1060 print_nul_chk_table(); 1061 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1062 } 1063 1064 if (printmethod) { 1065 print_recorded_oops(); 1066 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1067 print_recorded_metadata(); 1068 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1069 } 1070 } 1071 #endif 1072 1073 if (xtty != NULL) { 1074 xtty->tail("print_nmethod"); 1075 } 1076 } 1077 1078 1079 // Promote one word from an assembly-time handle to a live embedded oop. 1080 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1081 if (handle == NULL || 1082 // As a special case, IC oops are initialized to 1 or -1. 1083 handle == (jobject) Universe::non_oop_word()) { 1084 *(void**)dest = handle; 1085 } else { 1086 *dest = JNIHandles::resolve_non_null(handle); 1087 } 1088 } 1089 1090 1091 // Have to have the same name because it's called by a template 1092 void nmethod::copy_values(GrowableArray<jobject>* array) { 1093 int length = array->length(); 1094 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1095 oop* dest = oops_begin(); 1096 for (int index = 0 ; index < length; index++) { 1097 initialize_immediate_oop(&dest[index], array->at(index)); 1098 } 1099 1100 // Now we can fix up all the oops in the code. We need to do this 1101 // in the code because the assembler uses jobjects as placeholders. 1102 // The code and relocations have already been initialized by the 1103 // CodeBlob constructor, so it is valid even at this early point to 1104 // iterate over relocations and patch the code. 1105 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1106 } 1107 1108 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1109 int length = array->length(); 1110 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1111 Metadata** dest = metadata_begin(); 1112 for (int index = 0 ; index < length; index++) { 1113 dest[index] = array->at(index); 1114 } 1115 } 1116 1117 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1118 // re-patch all oop-bearing instructions, just in case some oops moved 1119 RelocIterator iter(this, begin, end); 1120 while (iter.next()) { 1121 if (iter.type() == relocInfo::oop_type) { 1122 oop_Relocation* reloc = iter.oop_reloc(); 1123 if (initialize_immediates && reloc->oop_is_immediate()) { 1124 oop* dest = reloc->oop_addr(); 1125 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest)); 1126 } 1127 // Refresh the oop-related bits of this instruction. 1128 reloc->fix_oop_relocation(); 1129 } else if (iter.type() == relocInfo::metadata_type) { 1130 metadata_Relocation* reloc = iter.metadata_reloc(); 1131 reloc->fix_metadata_relocation(); 1132 } 1133 } 1134 } 1135 1136 static void install_post_call_nop_displacement(nmethod* nm, address pc) { 1137 NativePostCallNop* nop = nativePostCallNop_at((address) pc); 1138 intptr_t cbaddr = (intptr_t) nm; 1139 intptr_t offset = ((intptr_t) pc) - cbaddr; 1140 1141 int oopmap_slot = nm->oop_maps()->find_slot_for_offset((intptr_t) pc - (intptr_t) nm->code_begin()); 1142 if (oopmap_slot < 0) { // this can happen at asynchronous (non-safepoint) stackwalks 1143 log_debug(codecache)("failed to find oopmap for cb: " INTPTR_FORMAT " offset: %d", cbaddr, (int) offset); 1144 } else if (((oopmap_slot & 0xff) == oopmap_slot) && ((offset & 0xffffff) == offset)) { 1145 jint value = (oopmap_slot << 24) | (jint) offset; 1146 nop->patch(value); 1147 } else { 1148 log_debug(codecache)("failed to encode %d %d", oopmap_slot, (int) offset); 1149 } 1150 } 1151 1152 void nmethod::finalize_relocations() { 1153 NoSafepointVerifier nsv; 1154 1155 // Make sure that post call nops fill in nmethod offsets eagerly so 1156 // we don't have to race with deoptimization 1157 RelocIterator iter(this); 1158 while (iter.next()) { 1159 if (iter.type() == relocInfo::post_call_nop_type) { 1160 post_call_nop_Relocation* const reloc = iter.post_call_nop_reloc(); 1161 address pc = reloc->addr(); 1162 install_post_call_nop_displacement(this, pc); 1163 } 1164 } 1165 } 1166 1167 void nmethod::make_deoptimized() { 1168 if (!Continuations::enabled()) { 1169 return; 1170 } 1171 1172 assert(method() == NULL || can_be_deoptimized(), ""); 1173 1174 CompiledICLocker ml(this); 1175 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1176 ResourceMark rm; 1177 RelocIterator iter(this, oops_reloc_begin()); 1178 1179 while (iter.next()) { 1180 1181 switch (iter.type()) { 1182 case relocInfo::virtual_call_type: 1183 case relocInfo::opt_virtual_call_type: { 1184 CompiledIC *ic = CompiledIC_at(&iter); 1185 address pc = ic->end_of_call(); 1186 NativePostCallNop* nop = nativePostCallNop_at(pc); 1187 if (nop != NULL) { 1188 nop->make_deopt(); 1189 } 1190 assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); 1191 break; 1192 } 1193 case relocInfo::static_call_type: { 1194 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1195 address pc = csc->end_of_call(); 1196 NativePostCallNop* nop = nativePostCallNop_at(pc); 1197 //tty->print_cr(" - static pc %p", pc); 1198 if (nop != NULL) { 1199 nop->make_deopt(); 1200 } 1201 // We can't assert here, there are some calls to stubs / runtime 1202 // that have reloc data and doesn't have a post call NOP. 1203 //assert(NativeDeoptInstruction::is_deopt_at(pc), "check"); 1204 break; 1205 } 1206 default: 1207 break; 1208 } 1209 } 1210 // Don't deopt this again. 1211 mark_deoptimized(); 1212 } 1213 1214 void nmethod::verify_clean_inline_caches() { 1215 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1216 1217 ResourceMark rm; 1218 RelocIterator iter(this, oops_reloc_begin()); 1219 while(iter.next()) { 1220 switch(iter.type()) { 1221 case relocInfo::virtual_call_type: 1222 case relocInfo::opt_virtual_call_type: { 1223 CompiledIC *ic = CompiledIC_at(&iter); 1224 CodeBlob *cb = CodeCache::find_blob(ic->ic_destination()); 1225 assert(cb != NULL, "destination not in CodeBlob?"); 1226 nmethod* nm = cb->as_nmethod_or_null(); 1227 if( nm != NULL ) { 1228 // Verify that inline caches pointing to bad nmethods are clean 1229 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1230 assert(ic->is_clean(), "IC should be clean"); 1231 } 1232 } 1233 break; 1234 } 1235 case relocInfo::static_call_type: { 1236 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1237 CodeBlob *cb = CodeCache::find_blob(csc->destination()); 1238 assert(cb != NULL, "destination not in CodeBlob?"); 1239 nmethod* nm = cb->as_nmethod_or_null(); 1240 if( nm != NULL ) { 1241 // Verify that inline caches pointing to bad nmethods are clean 1242 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1243 assert(csc->is_clean(), "IC should be clean"); 1244 } 1245 } 1246 break; 1247 } 1248 default: 1249 break; 1250 } 1251 } 1252 } 1253 1254 void nmethod::mark_as_maybe_on_stack() { 1255 Atomic::store(&_gc_epoch, CodeCache::gc_epoch()); 1256 } 1257 1258 bool nmethod::is_maybe_on_stack() { 1259 // If the condition below is true, it means that the nmethod was found to 1260 // be alive the previous completed marking cycle. 1261 return Atomic::load(&_gc_epoch) >= CodeCache::previous_completed_gc_marking_cycle(); 1262 } 1263 1264 void nmethod::inc_decompile_count() { 1265 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1266 // Could be gated by ProfileTraps, but do not bother... 1267 Method* m = method(); 1268 if (m == NULL) return; 1269 MethodData* mdo = m->method_data(); 1270 if (mdo == NULL) return; 1271 // There is a benign race here. See comments in methodData.hpp. 1272 mdo->inc_decompile_count(); 1273 } 1274 1275 bool nmethod::try_transition(int new_state_int) { 1276 signed char new_state = new_state_int; 1277 assert_lock_strong(CompiledMethod_lock); 1278 signed char old_state = _state; 1279 if (old_state >= new_state) { 1280 // Ensure monotonicity of transitions. 1281 return false; 1282 } 1283 Atomic::store(&_state, new_state); 1284 return true; 1285 } 1286 1287 void nmethod::invalidate_osr_method() { 1288 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1289 // Remove from list of active nmethods 1290 if (method() != NULL) { 1291 method()->method_holder()->remove_osr_nmethod(this); 1292 } 1293 } 1294 1295 void nmethod::log_state_change() const { 1296 if (LogCompilation) { 1297 if (xtty != NULL) { 1298 ttyLocker ttyl; // keep the following output all in one block 1299 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'", 1300 os::current_thread_id()); 1301 log_identity(xtty); 1302 xtty->stamp(); 1303 xtty->end_elem(); 1304 } 1305 } 1306 1307 CompileTask::print_ul(this, "made not entrant"); 1308 if (PrintCompilation) { 1309 print_on(tty, "made not entrant"); 1310 } 1311 } 1312 1313 void nmethod::unlink_from_method() { 1314 if (method() != NULL) { 1315 method()->unlink_code(this); 1316 } 1317 } 1318 1319 // Invalidate code 1320 bool nmethod::make_not_entrant() { 1321 // This can be called while the system is already at a safepoint which is ok 1322 NoSafepointVerifier nsv; 1323 1324 if (is_unloading()) { 1325 // If the nmethod is unloading, then it is already not entrant through 1326 // the nmethod entry barriers. No need to do anything; GC will unload it. 1327 return false; 1328 } 1329 1330 if (Atomic::load(&_state) == not_entrant) { 1331 // Avoid taking the lock if already in required state. 1332 // This is safe from races because the state is an end-state, 1333 // which the nmethod cannot back out of once entered. 1334 // No need for fencing either. 1335 return false; 1336 } 1337 1338 { 1339 // Enter critical section. Does not block for safepoint. 1340 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1341 1342 if (Atomic::load(&_state) == not_entrant) { 1343 // another thread already performed this transition so nothing 1344 // to do, but return false to indicate this. 1345 return false; 1346 } 1347 1348 if (is_osr_method()) { 1349 // This logic is equivalent to the logic below for patching the 1350 // verified entry point of regular methods. 1351 // this effectively makes the osr nmethod not entrant 1352 invalidate_osr_method(); 1353 } else { 1354 // The caller can be calling the method statically or through an inline 1355 // cache call. 1356 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1357 SharedRuntime::get_handle_wrong_method_stub()); 1358 } 1359 1360 if (update_recompile_counts()) { 1361 // Mark the method as decompiled. 1362 inc_decompile_count(); 1363 } 1364 1365 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1366 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { 1367 // If nmethod entry barriers are not supported, we won't mark 1368 // nmethods as on-stack when they become on-stack. So we 1369 // degrade to a less accurate flushing strategy, for now. 1370 mark_as_maybe_on_stack(); 1371 } 1372 1373 // Change state 1374 bool success = try_transition(not_entrant); 1375 assert(success, "Transition can't fail"); 1376 1377 // Log the transition once 1378 log_state_change(); 1379 1380 // Remove nmethod from method. 1381 unlink_from_method(); 1382 1383 } // leave critical region under CompiledMethod_lock 1384 1385 #if INCLUDE_JVMCI 1386 // Invalidate can't occur while holding the Patching lock 1387 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1388 if (nmethod_data != NULL) { 1389 nmethod_data->invalidate_nmethod_mirror(this); 1390 } 1391 #endif 1392 1393 #ifdef ASSERT 1394 if (is_osr_method() && method() != NULL) { 1395 // Make sure osr nmethod is invalidated, i.e. not on the list 1396 bool found = method()->method_holder()->remove_osr_nmethod(this); 1397 assert(!found, "osr nmethod should have been invalidated"); 1398 } 1399 #endif 1400 1401 return true; 1402 } 1403 1404 // For concurrent GCs, there must be a handshake between unlink and flush 1405 void nmethod::unlink() { 1406 if (_unlinked_next != NULL) { 1407 // Already unlinked. It can be invoked twice because concurrent code cache 1408 // unloading might need to restart when inline cache cleaning fails due to 1409 // running out of ICStubs, which can only be refilled at safepoints 1410 return; 1411 } 1412 1413 flush_dependencies(); 1414 1415 // unlink_from_method will take the CompiledMethod_lock. 1416 // In this case we don't strictly need it when unlinking nmethods from 1417 // the Method, because it is only concurrently unlinked by 1418 // the entry barrier, which acquires the per nmethod lock. 1419 unlink_from_method(); 1420 clear_ic_callsites(); 1421 1422 if (is_osr_method()) { 1423 invalidate_osr_method(); 1424 } 1425 1426 #if INCLUDE_JVMCI 1427 // Clear the link between this nmethod and a HotSpotNmethod mirror 1428 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1429 if (nmethod_data != NULL) { 1430 nmethod_data->invalidate_nmethod_mirror(this); 1431 } 1432 #endif 1433 1434 // Post before flushing as jmethodID is being used 1435 post_compiled_method_unload(); 1436 1437 // Register for flushing when it is safe. For concurrent class unloading, 1438 // that would be after the unloading handshake, and for STW class unloading 1439 // that would be when getting back to the VM thread. 1440 CodeCache::register_unlinked(this); 1441 } 1442 1443 void nmethod::flush() { 1444 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1445 1446 // completely deallocate this method 1447 Events::log(Thread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1448 log_debug(codecache)("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1449 "/Free CodeCache:" SIZE_FORMAT "Kb", 1450 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1451 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1452 1453 // We need to deallocate any ExceptionCache data. 1454 // Note that we do not need to grab the nmethod lock for this, it 1455 // better be thread safe if we're disposing of it! 1456 ExceptionCache* ec = exception_cache(); 1457 while(ec != NULL) { 1458 ExceptionCache* next = ec->next(); 1459 delete ec; 1460 ec = next; 1461 } 1462 1463 Universe::heap()->unregister_nmethod(this); 1464 CodeCache::unregister_old_nmethod(this); 1465 1466 CodeBlob::flush(); 1467 CodeCache::free(this); 1468 } 1469 1470 oop nmethod::oop_at(int index) const { 1471 if (index == 0) { 1472 return NULL; 1473 } 1474 return NMethodAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1475 } 1476 1477 oop nmethod::oop_at_phantom(int index) const { 1478 if (index == 0) { 1479 return NULL; 1480 } 1481 return NMethodAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); 1482 } 1483 1484 // 1485 // Notify all classes this nmethod is dependent on that it is no 1486 // longer dependent. 1487 1488 void nmethod::flush_dependencies() { 1489 if (!has_flushed_dependencies()) { 1490 set_has_flushed_dependencies(); 1491 for (Dependencies::DepStream deps(this); deps.next(); ) { 1492 if (deps.type() == Dependencies::call_site_target_value) { 1493 // CallSite dependencies are managed on per-CallSite instance basis. 1494 oop call_site = deps.argument_oop(0); 1495 MethodHandles::clean_dependency_context(call_site); 1496 } else { 1497 Klass* klass = deps.context_type(); 1498 if (klass == NULL) { 1499 continue; // ignore things like evol_method 1500 } 1501 // During GC liveness of dependee determines class that needs to be updated. 1502 // The GC may clean dependency contexts concurrently and in parallel. 1503 InstanceKlass::cast(klass)->clean_dependency_context(); 1504 } 1505 } 1506 } 1507 } 1508 1509 void nmethod::post_compiled_method(CompileTask* task) { 1510 task->mark_success(); 1511 task->set_nm_content_size(content_size()); 1512 task->set_nm_insts_size(insts_size()); 1513 task->set_nm_total_size(total_size()); 1514 1515 // JVMTI -- compiled method notification (must be done outside lock) 1516 post_compiled_method_load_event(); 1517 1518 if (CompilationLog::log() != NULL) { 1519 CompilationLog::log()->log_nmethod(JavaThread::current(), this); 1520 } 1521 1522 const DirectiveSet* directive = task->directive(); 1523 maybe_print_nmethod(directive); 1524 } 1525 1526 // ------------------------------------------------------------------ 1527 // post_compiled_method_load_event 1528 // new method for install_code() path 1529 // Transfer information from compilation to jvmti 1530 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) { 1531 // This is a bad time for a safepoint. We don't want 1532 // this nmethod to get unloaded while we're queueing the event. 1533 NoSafepointVerifier nsv; 1534 1535 Method* m = method(); 1536 HOTSPOT_COMPILED_METHOD_LOAD( 1537 (char *) m->klass_name()->bytes(), 1538 m->klass_name()->utf8_length(), 1539 (char *) m->name()->bytes(), 1540 m->name()->utf8_length(), 1541 (char *) m->signature()->bytes(), 1542 m->signature()->utf8_length(), 1543 insts_begin(), insts_size()); 1544 1545 1546 if (JvmtiExport::should_post_compiled_method_load()) { 1547 // Only post unload events if load events are found. 1548 set_load_reported(); 1549 // If a JavaThread hasn't been passed in, let the Service thread 1550 // (which is a real Java thread) post the event 1551 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this); 1552 if (state == NULL) { 1553 // Execute any barrier code for this nmethod as if it's called, since 1554 // keeping it alive looks like stack walking. 1555 run_nmethod_entry_barrier(); 1556 ServiceThread::enqueue_deferred_event(&event); 1557 } else { 1558 // This enters the nmethod barrier outside in the caller. 1559 state->enqueue_event(&event); 1560 } 1561 } 1562 } 1563 1564 void nmethod::post_compiled_method_unload() { 1565 assert(_method != NULL, "just checking"); 1566 DTRACE_METHOD_UNLOAD_PROBE(method()); 1567 1568 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1569 // post the event. The Method* will not be valid when this is freed. 1570 1571 // Don't bother posting the unload if the load event wasn't posted. 1572 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) { 1573 JvmtiDeferredEvent event = 1574 JvmtiDeferredEvent::compiled_method_unload_event( 1575 method()->jmethod_id(), insts_begin()); 1576 ServiceThread::enqueue_deferred_event(&event); 1577 } 1578 } 1579 1580 // Iterate over metadata calling this function. Used by RedefineClasses 1581 void nmethod::metadata_do(MetadataClosure* f) { 1582 { 1583 // Visit all immediate references that are embedded in the instruction stream. 1584 RelocIterator iter(this, oops_reloc_begin()); 1585 while (iter.next()) { 1586 if (iter.type() == relocInfo::metadata_type) { 1587 metadata_Relocation* r = iter.metadata_reloc(); 1588 // In this metadata, we must only follow those metadatas directly embedded in 1589 // the code. Other metadatas (oop_index>0) are seen as part of 1590 // the metadata section below. 1591 assert(1 == (r->metadata_is_immediate()) + 1592 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1593 "metadata must be found in exactly one place"); 1594 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1595 Metadata* md = r->metadata_value(); 1596 if (md != _method) f->do_metadata(md); 1597 } 1598 } else if (iter.type() == relocInfo::virtual_call_type) { 1599 // Check compiledIC holders associated with this nmethod 1600 ResourceMark rm; 1601 CompiledIC *ic = CompiledIC_at(&iter); 1602 if (ic->is_icholder_call()) { 1603 CompiledICHolder* cichk = ic->cached_icholder(); 1604 f->do_metadata(cichk->holder_metadata()); 1605 f->do_metadata(cichk->holder_klass()); 1606 } else { 1607 Metadata* ic_oop = ic->cached_metadata(); 1608 if (ic_oop != NULL) { 1609 f->do_metadata(ic_oop); 1610 } 1611 } 1612 } 1613 } 1614 } 1615 1616 // Visit the metadata section 1617 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1618 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1619 Metadata* md = *p; 1620 f->do_metadata(md); 1621 } 1622 1623 // Visit metadata not embedded in the other places. 1624 if (_method != NULL) f->do_metadata(_method); 1625 } 1626 1627 // Heuristic for nuking nmethods even though their oops are live. 1628 // Main purpose is to reduce code cache pressure and get rid of 1629 // nmethods that don't seem to be all that relevant any longer. 1630 bool nmethod::is_cold() { 1631 if (!MethodFlushing || is_native_method() || is_not_installed()) { 1632 // No heuristic unloading at all 1633 return false; 1634 } 1635 1636 if (!is_maybe_on_stack() && is_not_entrant()) { 1637 // Not entrant nmethods that are not on any stack can just 1638 // be removed 1639 return true; 1640 } 1641 1642 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1643 if (bs_nm == nullptr || !bs_nm->supports_entry_barrier(this)) { 1644 // On platforms that don't support nmethod entry barriers, we can't 1645 // trust the temporal aspect of the gc epochs. So we can't detect 1646 // cold nmethods on such platforms. 1647 return false; 1648 } 1649 1650 if (!UseCodeCacheFlushing) { 1651 // Bail out if we don't heuristically remove nmethods 1652 return false; 1653 } 1654 1655 // Other code can be phased out more gradually after N GCs 1656 return CodeCache::previous_completed_gc_marking_cycle() > _gc_epoch + 2 * CodeCache::cold_gc_count(); 1657 } 1658 1659 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1660 // and the result of IsUnloadingBehaviour::is_unloading() for that cycle. 1661 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1662 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1663 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1664 1665 class IsUnloadingState: public AllStatic { 1666 static const uint8_t _is_unloading_mask = 1; 1667 static const uint8_t _is_unloading_shift = 0; 1668 static const uint8_t _unloading_cycle_mask = 6; 1669 static const uint8_t _unloading_cycle_shift = 1; 1670 1671 static uint8_t set_is_unloading(uint8_t state, bool value) { 1672 state &= ~_is_unloading_mask; 1673 if (value) { 1674 state |= 1 << _is_unloading_shift; 1675 } 1676 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1677 return state; 1678 } 1679 1680 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1681 state &= ~_unloading_cycle_mask; 1682 state |= value << _unloading_cycle_shift; 1683 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1684 return state; 1685 } 1686 1687 public: 1688 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1689 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1690 1691 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1692 uint8_t state = 0; 1693 state = set_is_unloading(state, is_unloading); 1694 state = set_unloading_cycle(state, unloading_cycle); 1695 return state; 1696 } 1697 }; 1698 1699 bool nmethod::is_unloading() { 1700 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1701 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1702 if (state_is_unloading) { 1703 return true; 1704 } 1705 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1706 uint8_t current_cycle = CodeCache::unloading_cycle(); 1707 if (state_unloading_cycle == current_cycle) { 1708 return false; 1709 } 1710 1711 // The IsUnloadingBehaviour is responsible for calculating if the nmethod 1712 // should be unloaded. This can be either because there is a dead oop, 1713 // or because is_cold() heuristically determines it is time to unload. 1714 state_unloading_cycle = current_cycle; 1715 state_is_unloading = IsUnloadingBehaviour::is_unloading(this); 1716 uint8_t new_state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1717 1718 // Note that if an nmethod has dead oops, everyone will agree that the 1719 // nmethod is_unloading. However, the is_cold heuristics can yield 1720 // different outcomes, so we guard the computed result with a CAS 1721 // to ensure all threads have a shared view of whether an nmethod 1722 // is_unloading or not. 1723 uint8_t found_state = Atomic::cmpxchg(&_is_unloading_state, state, new_state, memory_order_relaxed); 1724 1725 if (found_state == state) { 1726 // First to change state, we win 1727 return state_is_unloading; 1728 } else { 1729 // State already set, so use it 1730 return IsUnloadingState::is_unloading(found_state); 1731 } 1732 } 1733 1734 void nmethod::clear_unloading_state() { 1735 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1736 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1737 } 1738 1739 1740 // This is called at the end of the strong tracing/marking phase of a 1741 // GC to unload an nmethod if it contains otherwise unreachable 1742 // oops or is heuristically found to be not important. 1743 void nmethod::do_unloading(bool unloading_occurred) { 1744 // Make sure the oop's ready to receive visitors 1745 if (is_unloading()) { 1746 unlink(); 1747 } else { 1748 guarantee(unload_nmethod_caches(unloading_occurred), 1749 "Should not need transition stubs"); 1750 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1751 if (bs_nm != NULL) { 1752 bs_nm->disarm(this); 1753 } 1754 } 1755 } 1756 1757 void nmethod::oops_do(OopClosure* f, bool allow_dead) { 1758 // Prevent extra code cache walk for platforms that don't have immediate oops. 1759 if (relocInfo::mustIterateImmediateOopsInCode()) { 1760 RelocIterator iter(this, oops_reloc_begin()); 1761 1762 while (iter.next()) { 1763 if (iter.type() == relocInfo::oop_type ) { 1764 oop_Relocation* r = iter.oop_reloc(); 1765 // In this loop, we must only follow those oops directly embedded in 1766 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1767 assert(1 == (r->oop_is_immediate()) + 1768 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1769 "oop must be found in exactly one place"); 1770 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1771 f->do_oop(r->oop_addr()); 1772 } 1773 } 1774 } 1775 } 1776 1777 // Scopes 1778 // This includes oop constants not inlined in the code stream. 1779 for (oop* p = oops_begin(); p < oops_end(); p++) { 1780 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1781 f->do_oop(p); 1782 } 1783 } 1784 1785 void nmethod::follow_nmethod(OopIterateClosure* cl) { 1786 // Process oops in the nmethod 1787 oops_do(cl); 1788 1789 // CodeCache unloading support 1790 mark_as_maybe_on_stack(); 1791 1792 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod(); 1793 bs_nm->disarm(this); 1794 1795 // There's an assumption made that this function is not used by GCs that 1796 // relocate objects, and therefore we don't call fix_oop_relocations. 1797 } 1798 1799 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1800 1801 void nmethod::oops_do_log_change(const char* state) { 1802 LogTarget(Trace, gc, nmethod) lt; 1803 if (lt.is_enabled()) { 1804 LogStream ls(lt); 1805 CompileTask::print(&ls, this, state, true /* short_form */); 1806 } 1807 } 1808 1809 bool nmethod::oops_do_try_claim() { 1810 if (oops_do_try_claim_weak_request()) { 1811 nmethod* result = oops_do_try_add_to_list_as_weak_done(); 1812 assert(result == NULL, "adding to global list as weak done must always succeed."); 1813 return true; 1814 } 1815 return false; 1816 } 1817 1818 bool nmethod::oops_do_try_claim_weak_request() { 1819 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1820 1821 if ((_oops_do_mark_link == NULL) && 1822 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) { 1823 oops_do_log_change("oops_do, mark weak request"); 1824 return true; 1825 } 1826 return false; 1827 } 1828 1829 void nmethod::oops_do_set_strong_done(nmethod* old_head) { 1830 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag); 1831 } 1832 1833 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() { 1834 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1835 1836 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, mark_link(NULL, claim_weak_request_tag), mark_link(this, claim_strong_done_tag)); 1837 if (old_next == NULL) { 1838 oops_do_log_change("oops_do, mark strong done"); 1839 } 1840 return old_next; 1841 } 1842 1843 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) { 1844 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1845 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak"); 1846 1847 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag)); 1848 if (old_next == next) { 1849 oops_do_log_change("oops_do, mark strong request"); 1850 } 1851 return old_next; 1852 } 1853 1854 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) { 1855 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1856 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done"); 1857 1858 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag)); 1859 if (old_next == next) { 1860 oops_do_log_change("oops_do, mark weak done -> mark strong done"); 1861 return true; 1862 } 1863 return false; 1864 } 1865 1866 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() { 1867 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1868 1869 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag || 1870 extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1871 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1872 1873 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1874 // Self-loop if needed. 1875 if (old_head == NULL) { 1876 old_head = this; 1877 } 1878 // Try to install end of list and weak done tag. 1879 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)) { 1880 oops_do_log_change("oops_do, mark weak done"); 1881 return NULL; 1882 } else { 1883 return old_head; 1884 } 1885 } 1886 1887 void nmethod::oops_do_add_to_list_as_strong_done() { 1888 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1889 1890 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1891 // Self-loop if needed. 1892 if (old_head == NULL) { 1893 old_head = this; 1894 } 1895 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u", 1896 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1897 1898 oops_do_set_strong_done(old_head); 1899 } 1900 1901 void nmethod::oops_do_process_weak(OopsDoProcessor* p) { 1902 if (!oops_do_try_claim_weak_request()) { 1903 // Failed to claim for weak processing. 1904 oops_do_log_change("oops_do, mark weak request fail"); 1905 return; 1906 } 1907 1908 p->do_regular_processing(this); 1909 1910 nmethod* old_head = oops_do_try_add_to_list_as_weak_done(); 1911 if (old_head == NULL) { 1912 return; 1913 } 1914 oops_do_log_change("oops_do, mark weak done fail"); 1915 // Adding to global list failed, another thread added a strong request. 1916 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1917 "must be but is %u", extract_state(_oops_do_mark_link)); 1918 1919 oops_do_log_change("oops_do, mark weak request -> mark strong done"); 1920 1921 oops_do_set_strong_done(old_head); 1922 // Do missing strong processing. 1923 p->do_remaining_strong_processing(this); 1924 } 1925 1926 void nmethod::oops_do_process_strong(OopsDoProcessor* p) { 1927 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done(); 1928 if (next_raw == NULL) { 1929 p->do_regular_processing(this); 1930 oops_do_add_to_list_as_strong_done(); 1931 return; 1932 } 1933 // Claim failed. Figure out why and handle it. 1934 if (oops_do_has_weak_request(next_raw)) { 1935 oops_do_mark_link* old = next_raw; 1936 // Claim failed because being weak processed (state == "weak request"). 1937 // Try to request deferred strong processing. 1938 next_raw = oops_do_try_add_strong_request(old); 1939 if (next_raw == old) { 1940 // Successfully requested deferred strong processing. 1941 return; 1942 } 1943 // Failed because of a concurrent transition. No longer in "weak request" state. 1944 } 1945 if (oops_do_has_any_strong_state(next_raw)) { 1946 // Already claimed for strong processing or requested for such. 1947 return; 1948 } 1949 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) { 1950 // Successfully claimed "weak done" as "strong done". Do the missing marking. 1951 p->do_remaining_strong_processing(this); 1952 return; 1953 } 1954 // Claim failed, some other thread got it. 1955 } 1956 1957 void nmethod::oops_do_marking_prologue() { 1958 assert_at_safepoint(); 1959 1960 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1961 assert(_oops_do_mark_nmethods == NULL, "must be empty"); 1962 } 1963 1964 void nmethod::oops_do_marking_epilogue() { 1965 assert_at_safepoint(); 1966 1967 nmethod* next = _oops_do_mark_nmethods; 1968 _oops_do_mark_nmethods = NULL; 1969 if (next != NULL) { 1970 nmethod* cur; 1971 do { 1972 cur = next; 1973 next = extract_nmethod(cur->_oops_do_mark_link); 1974 cur->_oops_do_mark_link = NULL; 1975 DEBUG_ONLY(cur->verify_oop_relocations()); 1976 1977 LogTarget(Trace, gc, nmethod) lt; 1978 if (lt.is_enabled()) { 1979 LogStream ls(lt); 1980 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1981 } 1982 // End if self-loop has been detected. 1983 } while (cur != next); 1984 } 1985 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1986 } 1987 1988 inline bool includes(void* p, void* from, void* to) { 1989 return from <= p && p < to; 1990 } 1991 1992 1993 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1994 assert(count >= 2, "must be sentinel values, at least"); 1995 1996 #ifdef ASSERT 1997 // must be sorted and unique; we do a binary search in find_pc_desc() 1998 int prev_offset = pcs[0].pc_offset(); 1999 assert(prev_offset == PcDesc::lower_offset_limit, 2000 "must start with a sentinel"); 2001 for (int i = 1; i < count; i++) { 2002 int this_offset = pcs[i].pc_offset(); 2003 assert(this_offset > prev_offset, "offsets must be sorted"); 2004 prev_offset = this_offset; 2005 } 2006 assert(prev_offset == PcDesc::upper_offset_limit, 2007 "must end with a sentinel"); 2008 #endif //ASSERT 2009 2010 // Search for MethodHandle invokes and tag the nmethod. 2011 for (int i = 0; i < count; i++) { 2012 if (pcs[i].is_method_handle_invoke()) { 2013 set_has_method_handle_invokes(true); 2014 break; 2015 } 2016 } 2017 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 2018 2019 int size = count * sizeof(PcDesc); 2020 assert(scopes_pcs_size() >= size, "oob"); 2021 memcpy(scopes_pcs_begin(), pcs, size); 2022 2023 // Adjust the final sentinel downward. 2024 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2025 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2026 last_pc->set_pc_offset(content_size() + 1); 2027 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2028 // Fill any rounding gaps with copies of the last record. 2029 last_pc[1] = last_pc[0]; 2030 } 2031 // The following assert could fail if sizeof(PcDesc) is not 2032 // an integral multiple of oopSize (the rounding term). 2033 // If it fails, change the logic to always allocate a multiple 2034 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2035 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2036 } 2037 2038 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2039 assert(scopes_data_size() >= size, "oob"); 2040 memcpy(scopes_data_begin(), buffer, size); 2041 } 2042 2043 #ifdef ASSERT 2044 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 2045 PcDesc* lower = search.scopes_pcs_begin(); 2046 PcDesc* upper = search.scopes_pcs_end(); 2047 lower += 1; // exclude initial sentinel 2048 PcDesc* res = NULL; 2049 for (PcDesc* p = lower; p < upper; p++) { 2050 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2051 if (match_desc(p, pc_offset, approximate)) { 2052 if (res == NULL) 2053 res = p; 2054 else 2055 res = (PcDesc*) badAddress; 2056 } 2057 } 2058 return res; 2059 } 2060 #endif 2061 2062 2063 // Finds a PcDesc with real-pc equal to "pc" 2064 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 2065 address base_address = search.code_begin(); 2066 if ((pc < base_address) || 2067 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2068 return NULL; // PC is wildly out of range 2069 } 2070 int pc_offset = (int) (pc - base_address); 2071 2072 // Check the PcDesc cache if it contains the desired PcDesc 2073 // (This as an almost 100% hit rate.) 2074 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2075 if (res != NULL) { 2076 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 2077 return res; 2078 } 2079 2080 // Fallback algorithm: quasi-linear search for the PcDesc 2081 // Find the last pc_offset less than the given offset. 2082 // The successor must be the required match, if there is a match at all. 2083 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2084 PcDesc* lower = search.scopes_pcs_begin(); 2085 PcDesc* upper = search.scopes_pcs_end(); 2086 upper -= 1; // exclude final sentinel 2087 if (lower >= upper) return NULL; // native method; no PcDescs at all 2088 2089 #define assert_LU_OK \ 2090 /* invariant on lower..upper during the following search: */ \ 2091 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2092 assert(upper->pc_offset() >= pc_offset, "sanity") 2093 assert_LU_OK; 2094 2095 // Use the last successful return as a split point. 2096 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2097 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2098 if (mid->pc_offset() < pc_offset) { 2099 lower = mid; 2100 } else { 2101 upper = mid; 2102 } 2103 2104 // Take giant steps at first (4096, then 256, then 16, then 1) 2105 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2106 const int RADIX = (1 << LOG2_RADIX); 2107 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2108 while ((mid = lower + step) < upper) { 2109 assert_LU_OK; 2110 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2111 if (mid->pc_offset() < pc_offset) { 2112 lower = mid; 2113 } else { 2114 upper = mid; 2115 break; 2116 } 2117 } 2118 assert_LU_OK; 2119 } 2120 2121 // Sneak up on the value with a linear search of length ~16. 2122 while (true) { 2123 assert_LU_OK; 2124 mid = lower + 1; 2125 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2126 if (mid->pc_offset() < pc_offset) { 2127 lower = mid; 2128 } else { 2129 upper = mid; 2130 break; 2131 } 2132 } 2133 #undef assert_LU_OK 2134 2135 if (match_desc(upper, pc_offset, approximate)) { 2136 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 2137 _pc_desc_cache.add_pc_desc(upper); 2138 return upper; 2139 } else { 2140 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 2141 return NULL; 2142 } 2143 } 2144 2145 2146 void nmethod::check_all_dependencies(DepChange& changes) { 2147 // Checked dependencies are allocated into this ResourceMark 2148 ResourceMark rm; 2149 2150 // Turn off dependency tracing while actually testing dependencies. 2151 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2152 2153 typedef ResourceHashtable<DependencySignature, int, 11027, 2154 AnyObj::RESOURCE_AREA, mtInternal, 2155 &DependencySignature::hash, 2156 &DependencySignature::equals> DepTable; 2157 2158 DepTable* table = new DepTable(); 2159 2160 // Iterate over live nmethods and check dependencies of all nmethods that are not 2161 // marked for deoptimization. A particular dependency is only checked once. 2162 NMethodIterator iter(NMethodIterator::only_not_unloading); 2163 while(iter.next()) { 2164 nmethod* nm = iter.method(); 2165 // Only notify for live nmethods 2166 if (!nm->is_marked_for_deoptimization()) { 2167 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2168 // Construct abstraction of a dependency. 2169 DependencySignature* current_sig = new DependencySignature(deps); 2170 2171 // Determine if dependency is already checked. table->put(...) returns 2172 // 'true' if the dependency is added (i.e., was not in the hashtable). 2173 if (table->put(*current_sig, 1)) { 2174 if (deps.check_dependency() != NULL) { 2175 // Dependency checking failed. Print out information about the failed 2176 // dependency and finally fail with an assert. We can fail here, since 2177 // dependency checking is never done in a product build. 2178 tty->print_cr("Failed dependency:"); 2179 changes.print(); 2180 nm->print(); 2181 nm->print_dependencies(); 2182 assert(false, "Should have been marked for deoptimization"); 2183 } 2184 } 2185 } 2186 } 2187 } 2188 } 2189 2190 bool nmethod::check_dependency_on(DepChange& changes) { 2191 // What has happened: 2192 // 1) a new class dependee has been added 2193 // 2) dependee and all its super classes have been marked 2194 bool found_check = false; // set true if we are upset 2195 for (Dependencies::DepStream deps(this); deps.next(); ) { 2196 // Evaluate only relevant dependencies. 2197 if (deps.spot_check_dependency_at(changes) != NULL) { 2198 found_check = true; 2199 NOT_DEBUG(break); 2200 } 2201 } 2202 return found_check; 2203 } 2204 2205 // Called from mark_for_deoptimization, when dependee is invalidated. 2206 bool nmethod::is_dependent_on_method(Method* dependee) { 2207 for (Dependencies::DepStream deps(this); deps.next(); ) { 2208 if (deps.type() != Dependencies::evol_method) 2209 continue; 2210 Method* method = deps.method_argument(0); 2211 if (method == dependee) return true; 2212 } 2213 return false; 2214 } 2215 2216 void nmethod_init() { 2217 // make sure you didn't forget to adjust the filler fields 2218 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2219 } 2220 2221 // ----------------------------------------------------------------------------- 2222 // Verification 2223 2224 class VerifyOopsClosure: public OopClosure { 2225 nmethod* _nm; 2226 bool _ok; 2227 public: 2228 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2229 bool ok() { return _ok; } 2230 virtual void do_oop(oop* p) { 2231 if (oopDesc::is_oop_or_null(*p)) return; 2232 // Print diagnostic information before calling print_nmethod(). 2233 // Assertions therein might prevent call from returning. 2234 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2235 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2236 if (_ok) { 2237 _nm->print_nmethod(true); 2238 _ok = false; 2239 } 2240 } 2241 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2242 }; 2243 2244 class VerifyMetadataClosure: public MetadataClosure { 2245 public: 2246 void do_metadata(Metadata* md) { 2247 if (md->is_method()) { 2248 Method* method = (Method*)md; 2249 assert(!method->is_old(), "Should not be installing old methods"); 2250 } 2251 } 2252 }; 2253 2254 2255 void nmethod::verify() { 2256 if (is_not_entrant()) 2257 return; 2258 2259 // Make sure all the entry points are correctly aligned for patching. 2260 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2261 2262 // assert(oopDesc::is_oop(method()), "must be valid"); 2263 2264 ResourceMark rm; 2265 2266 if (!CodeCache::contains(this)) { 2267 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2268 } 2269 2270 if(is_native_method() ) 2271 return; 2272 2273 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2274 if (nm != this) { 2275 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2276 } 2277 2278 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2279 if (! p->verify(this)) { 2280 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2281 } 2282 } 2283 2284 #ifdef ASSERT 2285 #if INCLUDE_JVMCI 2286 { 2287 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap 2288 ImmutableOopMapSet* oms = oop_maps(); 2289 ImplicitExceptionTable implicit_table(this); 2290 for (uint i = 0; i < implicit_table.len(); i++) { 2291 int exec_offset = (int) implicit_table.get_exec_offset(i); 2292 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) { 2293 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc"); 2294 bool found = false; 2295 for (int i = 0, imax = oms->count(); i < imax; i++) { 2296 if (oms->pair_at(i)->pc_offset() == exec_offset) { 2297 found = true; 2298 break; 2299 } 2300 } 2301 assert(found, "missing oopmap"); 2302 } 2303 } 2304 } 2305 #endif 2306 #endif 2307 2308 VerifyOopsClosure voc(this); 2309 oops_do(&voc); 2310 assert(voc.ok(), "embedded oops must be OK"); 2311 Universe::heap()->verify_nmethod(this); 2312 2313 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT, 2314 nm->method()->external_name(), p2i(_oops_do_mark_link)); 2315 verify_scopes(); 2316 2317 CompiledICLocker nm_verify(this); 2318 VerifyMetadataClosure vmc; 2319 metadata_do(&vmc); 2320 } 2321 2322 2323 void nmethod::verify_interrupt_point(address call_site) { 2324 2325 // Verify IC only when nmethod installation is finished. 2326 if (!is_not_installed()) { 2327 if (CompiledICLocker::is_safe(this)) { 2328 CompiledIC_at(this, call_site); 2329 } else { 2330 CompiledICLocker ml_verify(this); 2331 CompiledIC_at(this, call_site); 2332 } 2333 } 2334 2335 HandleMark hm(Thread::current()); 2336 2337 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2338 assert(pd != NULL, "PcDesc must exist"); 2339 for (ScopeDesc* sd = new ScopeDesc(this, pd); 2340 !sd->is_top(); sd = sd->sender()) { 2341 sd->verify(); 2342 } 2343 } 2344 2345 void nmethod::verify_scopes() { 2346 if( !method() ) return; // Runtime stubs have no scope 2347 if (method()->is_native()) return; // Ignore stub methods. 2348 // iterate through all interrupt point 2349 // and verify the debug information is valid. 2350 RelocIterator iter((nmethod*)this); 2351 while (iter.next()) { 2352 address stub = NULL; 2353 switch (iter.type()) { 2354 case relocInfo::virtual_call_type: 2355 verify_interrupt_point(iter.addr()); 2356 break; 2357 case relocInfo::opt_virtual_call_type: 2358 stub = iter.opt_virtual_call_reloc()->static_stub(); 2359 verify_interrupt_point(iter.addr()); 2360 break; 2361 case relocInfo::static_call_type: 2362 stub = iter.static_call_reloc()->static_stub(); 2363 //verify_interrupt_point(iter.addr()); 2364 break; 2365 case relocInfo::runtime_call_type: 2366 case relocInfo::runtime_call_w_cp_type: { 2367 address destination = iter.reloc()->value(); 2368 // Right now there is no way to find out which entries support 2369 // an interrupt point. It would be nice if we had this 2370 // information in a table. 2371 break; 2372 } 2373 default: 2374 break; 2375 } 2376 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2377 } 2378 } 2379 2380 2381 // ----------------------------------------------------------------------------- 2382 // Printing operations 2383 2384 void nmethod::print() const { 2385 ttyLocker ttyl; // keep the following output all in one block 2386 print(tty); 2387 } 2388 2389 void nmethod::print(outputStream* st) const { 2390 ResourceMark rm; 2391 2392 st->print("Compiled method "); 2393 2394 if (is_compiled_by_c1()) { 2395 st->print("(c1) "); 2396 } else if (is_compiled_by_c2()) { 2397 st->print("(c2) "); 2398 } else if (is_compiled_by_jvmci()) { 2399 st->print("(JVMCI) "); 2400 } else { 2401 st->print("(n/a) "); 2402 } 2403 2404 print_on(st, NULL); 2405 2406 if (WizardMode) { 2407 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2408 st->print(" for method " INTPTR_FORMAT , p2i(method())); 2409 st->print(" { "); 2410 st->print_cr("%s ", state()); 2411 st->print_cr("}:"); 2412 } 2413 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2414 p2i(this), 2415 p2i(this) + size(), 2416 size()); 2417 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2418 p2i(relocation_begin()), 2419 p2i(relocation_end()), 2420 relocation_size()); 2421 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2422 p2i(consts_begin()), 2423 p2i(consts_end()), 2424 consts_size()); 2425 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2426 p2i(insts_begin()), 2427 p2i(insts_end()), 2428 insts_size()); 2429 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2430 p2i(stub_begin()), 2431 p2i(stub_end()), 2432 stub_size()); 2433 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2434 p2i(oops_begin()), 2435 p2i(oops_end()), 2436 oops_size()); 2437 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2438 p2i(metadata_begin()), 2439 p2i(metadata_end()), 2440 metadata_size()); 2441 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2442 p2i(scopes_data_begin()), 2443 p2i(scopes_data_end()), 2444 scopes_data_size()); 2445 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2446 p2i(scopes_pcs_begin()), 2447 p2i(scopes_pcs_end()), 2448 scopes_pcs_size()); 2449 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2450 p2i(dependencies_begin()), 2451 p2i(dependencies_end()), 2452 dependencies_size()); 2453 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2454 p2i(handler_table_begin()), 2455 p2i(handler_table_end()), 2456 handler_table_size()); 2457 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2458 p2i(nul_chk_table_begin()), 2459 p2i(nul_chk_table_end()), 2460 nul_chk_table_size()); 2461 #if INCLUDE_JVMCI 2462 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2463 p2i(speculations_begin()), 2464 p2i(speculations_end()), 2465 speculations_size()); 2466 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2467 p2i(jvmci_data_begin()), 2468 p2i(jvmci_data_end()), 2469 jvmci_data_size()); 2470 #endif 2471 } 2472 2473 void nmethod::print_code() { 2474 ResourceMark m; 2475 ttyLocker ttyl; 2476 // Call the specialized decode method of this class. 2477 decode(tty); 2478 } 2479 2480 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN 2481 2482 void nmethod::print_dependencies() { 2483 ResourceMark rm; 2484 ttyLocker ttyl; // keep the following output all in one block 2485 tty->print_cr("Dependencies:"); 2486 for (Dependencies::DepStream deps(this); deps.next(); ) { 2487 deps.print_dependency(); 2488 Klass* ctxk = deps.context_type(); 2489 if (ctxk != NULL) { 2490 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2491 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2492 } 2493 } 2494 deps.log_dependency(); // put it into the xml log also 2495 } 2496 } 2497 #endif 2498 2499 #if defined(SUPPORT_DATA_STRUCTS) 2500 2501 // Print the oops from the underlying CodeBlob. 2502 void nmethod::print_oops(outputStream* st) { 2503 ResourceMark m; 2504 st->print("Oops:"); 2505 if (oops_begin() < oops_end()) { 2506 st->cr(); 2507 for (oop* p = oops_begin(); p < oops_end(); p++) { 2508 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false); 2509 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2510 if (Universe::contains_non_oop_word(p)) { 2511 st->print_cr("NON_OOP"); 2512 continue; // skip non-oops 2513 } 2514 if (*p == NULL) { 2515 st->print_cr("NULL-oop"); 2516 continue; // skip non-oops 2517 } 2518 (*p)->print_value_on(st); 2519 st->cr(); 2520 } 2521 } else { 2522 st->print_cr(" <list empty>"); 2523 } 2524 } 2525 2526 // Print metadata pool. 2527 void nmethod::print_metadata(outputStream* st) { 2528 ResourceMark m; 2529 st->print("Metadata:"); 2530 if (metadata_begin() < metadata_end()) { 2531 st->cr(); 2532 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2533 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false); 2534 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2535 if (*p && *p != Universe::non_oop_word()) { 2536 (*p)->print_value_on(st); 2537 } 2538 st->cr(); 2539 } 2540 } else { 2541 st->print_cr(" <list empty>"); 2542 } 2543 } 2544 2545 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN 2546 void nmethod::print_scopes_on(outputStream* st) { 2547 // Find the first pc desc for all scopes in the code and print it. 2548 ResourceMark rm; 2549 st->print("scopes:"); 2550 if (scopes_pcs_begin() < scopes_pcs_end()) { 2551 st->cr(); 2552 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2553 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2554 continue; 2555 2556 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2557 while (sd != NULL) { 2558 sd->print_on(st, p); // print output ends with a newline 2559 sd = sd->sender(); 2560 } 2561 } 2562 } else { 2563 st->print_cr(" <list empty>"); 2564 } 2565 } 2566 #endif 2567 2568 #ifndef PRODUCT // RelocIterator does support printing only then. 2569 void nmethod::print_relocations() { 2570 ResourceMark m; // in case methods get printed via the debugger 2571 tty->print_cr("relocations:"); 2572 RelocIterator iter(this); 2573 iter.print(); 2574 } 2575 #endif 2576 2577 void nmethod::print_pcs_on(outputStream* st) { 2578 ResourceMark m; // in case methods get printed via debugger 2579 st->print("pc-bytecode offsets:"); 2580 if (scopes_pcs_begin() < scopes_pcs_end()) { 2581 st->cr(); 2582 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2583 p->print_on(st, this); // print output ends with a newline 2584 } 2585 } else { 2586 st->print_cr(" <list empty>"); 2587 } 2588 } 2589 2590 void nmethod::print_handler_table() { 2591 ExceptionHandlerTable(this).print(code_begin()); 2592 } 2593 2594 void nmethod::print_nul_chk_table() { 2595 ImplicitExceptionTable(this).print(code_begin()); 2596 } 2597 2598 void nmethod::print_recorded_oop(int log_n, int i) { 2599 void* value; 2600 2601 if (i == 0) { 2602 value = NULL; 2603 } else { 2604 // Be careful around non-oop words. Don't create an oop 2605 // with that value, or it will assert in verification code. 2606 if (Universe::contains_non_oop_word(oop_addr_at(i))) { 2607 value = Universe::non_oop_word(); 2608 } else { 2609 value = oop_at(i); 2610 } 2611 } 2612 2613 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value)); 2614 2615 if (value == Universe::non_oop_word()) { 2616 tty->print("non-oop word"); 2617 } else { 2618 if (value == 0) { 2619 tty->print("NULL-oop"); 2620 } else { 2621 oop_at(i)->print_value_on(tty); 2622 } 2623 } 2624 2625 tty->cr(); 2626 } 2627 2628 void nmethod::print_recorded_oops() { 2629 const int n = oops_count(); 2630 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2631 tty->print("Recorded oops:"); 2632 if (n > 0) { 2633 tty->cr(); 2634 for (int i = 0; i < n; i++) { 2635 print_recorded_oop(log_n, i); 2636 } 2637 } else { 2638 tty->print_cr(" <list empty>"); 2639 } 2640 } 2641 2642 void nmethod::print_recorded_metadata() { 2643 const int n = metadata_count(); 2644 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2645 tty->print("Recorded metadata:"); 2646 if (n > 0) { 2647 tty->cr(); 2648 for (int i = 0; i < n; i++) { 2649 Metadata* m = metadata_at(i); 2650 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m)); 2651 if (m == (Metadata*)Universe::non_oop_word()) { 2652 tty->print("non-metadata word"); 2653 } else if (m == NULL) { 2654 tty->print("NULL-oop"); 2655 } else { 2656 Metadata::print_value_on_maybe_null(tty, m); 2657 } 2658 tty->cr(); 2659 } 2660 } else { 2661 tty->print_cr(" <list empty>"); 2662 } 2663 } 2664 #endif 2665 2666 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2667 2668 void nmethod::print_constant_pool(outputStream* st) { 2669 //----------------------------------- 2670 //---< Print the constant pool >--- 2671 //----------------------------------- 2672 int consts_size = this->consts_size(); 2673 if ( consts_size > 0 ) { 2674 unsigned char* cstart = this->consts_begin(); 2675 unsigned char* cp = cstart; 2676 unsigned char* cend = cp + consts_size; 2677 unsigned int bytes_per_line = 4; 2678 unsigned int CP_alignment = 8; 2679 unsigned int n; 2680 2681 st->cr(); 2682 2683 //---< print CP header to make clear what's printed >--- 2684 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) { 2685 n = bytes_per_line; 2686 st->print_cr("[Constant Pool]"); 2687 Disassembler::print_location(cp, cstart, cend, st, true, true); 2688 Disassembler::print_hexdata(cp, n, st, true); 2689 st->cr(); 2690 } else { 2691 n = (uintptr_t)cp&(bytes_per_line-1); 2692 st->print_cr("[Constant Pool (unaligned)]"); 2693 } 2694 2695 //---< print CP contents, bytes_per_line at a time >--- 2696 while (cp < cend) { 2697 Disassembler::print_location(cp, cstart, cend, st, true, false); 2698 Disassembler::print_hexdata(cp, n, st, false); 2699 cp += n; 2700 n = bytes_per_line; 2701 st->cr(); 2702 } 2703 2704 //---< Show potential alignment gap between constant pool and code >--- 2705 cend = code_begin(); 2706 if( cp < cend ) { 2707 n = 4; 2708 st->print_cr("[Code entry alignment]"); 2709 while (cp < cend) { 2710 Disassembler::print_location(cp, cstart, cend, st, false, false); 2711 cp += n; 2712 st->cr(); 2713 } 2714 } 2715 } else { 2716 st->print_cr("[Constant Pool (empty)]"); 2717 } 2718 st->cr(); 2719 } 2720 2721 #endif 2722 2723 // Disassemble this nmethod. 2724 // Print additional debug information, if requested. This could be code 2725 // comments, block comments, profiling counters, etc. 2726 // The undisassembled format is useful no disassembler library is available. 2727 // The resulting hex dump (with markers) can be disassembled later, or on 2728 // another system, when/where a disassembler library is available. 2729 void nmethod::decode2(outputStream* ost) const { 2730 2731 // Called from frame::back_trace_with_decode without ResourceMark. 2732 ResourceMark rm; 2733 2734 // Make sure we have a valid stream to print on. 2735 outputStream* st = ost ? ost : tty; 2736 2737 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY) 2738 const bool use_compressed_format = true; 2739 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2740 AbstractDisassembler::show_block_comment()); 2741 #else 2742 const bool use_compressed_format = Disassembler::is_abstract(); 2743 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2744 AbstractDisassembler::show_block_comment()); 2745 #endif 2746 2747 // Decoding an nmethod can write to a PcDescCache (see PcDescCache::add_pc_desc) 2748 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());) 2749 2750 st->cr(); 2751 this->print(st); 2752 st->cr(); 2753 2754 #if defined(SUPPORT_ASSEMBLY) 2755 //---------------------------------- 2756 //---< Print real disassembly >--- 2757 //---------------------------------- 2758 if (! use_compressed_format) { 2759 st->print_cr("[Disassembly]"); 2760 Disassembler::decode(const_cast<nmethod*>(this), st); 2761 st->bol(); 2762 st->print_cr("[/Disassembly]"); 2763 return; 2764 } 2765 #endif 2766 2767 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2768 2769 // Compressed undisassembled disassembly format. 2770 // The following status values are defined/supported: 2771 // = 0 - currently at bol() position, nothing printed yet on current line. 2772 // = 1 - currently at position after print_location(). 2773 // > 1 - in the midst of printing instruction stream bytes. 2774 int compressed_format_idx = 0; 2775 int code_comment_column = 0; 2776 const int instr_maxlen = Assembler::instr_maxlen(); 2777 const uint tabspacing = 8; 2778 unsigned char* start = this->code_begin(); 2779 unsigned char* p = this->code_begin(); 2780 unsigned char* end = this->code_end(); 2781 unsigned char* pss = p; // start of a code section (used for offsets) 2782 2783 if ((start == NULL) || (end == NULL)) { 2784 st->print_cr("PrintAssembly not possible due to uninitialized section pointers"); 2785 return; 2786 } 2787 #endif 2788 2789 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2790 //---< plain abstract disassembly, no comments or anything, just section headers >--- 2791 if (use_compressed_format && ! compressed_with_comments) { 2792 const_cast<nmethod*>(this)->print_constant_pool(st); 2793 2794 //---< Open the output (Marker for post-mortem disassembler) >--- 2795 st->print_cr("[MachCode]"); 2796 const char* header = NULL; 2797 address p0 = p; 2798 while (p < end) { 2799 address pp = p; 2800 while ((p < end) && (header == NULL)) { 2801 header = nmethod_section_label(p); 2802 pp = p; 2803 p += Assembler::instr_len(p); 2804 } 2805 if (pp > p0) { 2806 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen()); 2807 p0 = pp; 2808 p = pp; 2809 header = NULL; 2810 } else if (header != NULL) { 2811 st->bol(); 2812 st->print_cr("%s", header); 2813 header = NULL; 2814 } 2815 } 2816 //---< Close the output (Marker for post-mortem disassembler) >--- 2817 st->bol(); 2818 st->print_cr("[/MachCode]"); 2819 return; 2820 } 2821 #endif 2822 2823 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2824 //---< abstract disassembly with comments and section headers merged in >--- 2825 if (compressed_with_comments) { 2826 const_cast<nmethod*>(this)->print_constant_pool(st); 2827 2828 //---< Open the output (Marker for post-mortem disassembler) >--- 2829 st->print_cr("[MachCode]"); 2830 while ((p < end) && (p != NULL)) { 2831 const int instruction_size_in_bytes = Assembler::instr_len(p); 2832 2833 //---< Block comments for nmethod. Interrupts instruction stream, if any. >--- 2834 // Outputs a bol() before and a cr() after, but only if a comment is printed. 2835 // Prints nmethod_section_label as well. 2836 if (AbstractDisassembler::show_block_comment()) { 2837 print_block_comment(st, p); 2838 if (st->position() == 0) { 2839 compressed_format_idx = 0; 2840 } 2841 } 2842 2843 //---< New location information after line break >--- 2844 if (compressed_format_idx == 0) { 2845 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2846 compressed_format_idx = 1; 2847 } 2848 2849 //---< Code comment for current instruction. Address range [p..(p+len)) >--- 2850 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes; 2851 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end 2852 2853 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) { 2854 //---< interrupt instruction byte stream for code comment >--- 2855 if (compressed_format_idx > 1) { 2856 st->cr(); // interrupt byte stream 2857 st->cr(); // add an empty line 2858 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2859 } 2860 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end ); 2861 st->bol(); 2862 compressed_format_idx = 0; 2863 } 2864 2865 //---< New location information after line break >--- 2866 if (compressed_format_idx == 0) { 2867 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2868 compressed_format_idx = 1; 2869 } 2870 2871 //---< Nicely align instructions for readability >--- 2872 if (compressed_format_idx > 1) { 2873 Disassembler::print_delimiter(st); 2874 } 2875 2876 //---< Now, finally, print the actual instruction bytes >--- 2877 unsigned char* p0 = p; 2878 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen); 2879 compressed_format_idx += p - p0; 2880 2881 if (Disassembler::start_newline(compressed_format_idx-1)) { 2882 st->cr(); 2883 compressed_format_idx = 0; 2884 } 2885 } 2886 //---< Close the output (Marker for post-mortem disassembler) >--- 2887 st->bol(); 2888 st->print_cr("[/MachCode]"); 2889 return; 2890 } 2891 #endif 2892 } 2893 2894 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2895 2896 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2897 RelocIterator iter(this, begin, end); 2898 bool have_one = false; 2899 while (iter.next()) { 2900 have_one = true; 2901 switch (iter.type()) { 2902 case relocInfo::none: return "no_reloc"; 2903 case relocInfo::oop_type: { 2904 // Get a non-resizable resource-allocated stringStream. 2905 // Our callees make use of (nested) ResourceMarks. 2906 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024); 2907 oop_Relocation* r = iter.oop_reloc(); 2908 oop obj = r->oop_value(); 2909 st.print("oop("); 2910 if (obj == NULL) st.print("NULL"); 2911 else obj->print_value_on(&st); 2912 st.print(")"); 2913 return st.as_string(); 2914 } 2915 case relocInfo::metadata_type: { 2916 stringStream st; 2917 metadata_Relocation* r = iter.metadata_reloc(); 2918 Metadata* obj = r->metadata_value(); 2919 st.print("metadata("); 2920 if (obj == NULL) st.print("NULL"); 2921 else obj->print_value_on(&st); 2922 st.print(")"); 2923 return st.as_string(); 2924 } 2925 case relocInfo::runtime_call_type: 2926 case relocInfo::runtime_call_w_cp_type: { 2927 stringStream st; 2928 st.print("runtime_call"); 2929 CallRelocation* r = (CallRelocation*)iter.reloc(); 2930 address dest = r->destination(); 2931 CodeBlob* cb = CodeCache::find_blob(dest); 2932 if (cb != NULL) { 2933 st.print(" %s", cb->name()); 2934 } else { 2935 ResourceMark rm; 2936 const int buflen = 1024; 2937 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2938 int offset; 2939 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2940 st.print(" %s", buf); 2941 if (offset != 0) { 2942 st.print("+%d", offset); 2943 } 2944 } 2945 } 2946 return st.as_string(); 2947 } 2948 case relocInfo::virtual_call_type: { 2949 stringStream st; 2950 st.print_raw("virtual_call"); 2951 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2952 Method* m = r->method_value(); 2953 if (m != NULL) { 2954 assert(m->is_method(), ""); 2955 m->print_short_name(&st); 2956 } 2957 return st.as_string(); 2958 } 2959 case relocInfo::opt_virtual_call_type: { 2960 stringStream st; 2961 st.print_raw("optimized virtual_call"); 2962 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2963 Method* m = r->method_value(); 2964 if (m != NULL) { 2965 assert(m->is_method(), ""); 2966 m->print_short_name(&st); 2967 } 2968 return st.as_string(); 2969 } 2970 case relocInfo::static_call_type: { 2971 stringStream st; 2972 st.print_raw("static_call"); 2973 static_call_Relocation* r = iter.static_call_reloc(); 2974 Method* m = r->method_value(); 2975 if (m != NULL) { 2976 assert(m->is_method(), ""); 2977 m->print_short_name(&st); 2978 } 2979 return st.as_string(); 2980 } 2981 case relocInfo::static_stub_type: return "static_stub"; 2982 case relocInfo::external_word_type: return "external_word"; 2983 case relocInfo::internal_word_type: return "internal_word"; 2984 case relocInfo::section_word_type: return "section_word"; 2985 case relocInfo::poll_type: return "poll"; 2986 case relocInfo::poll_return_type: return "poll_return"; 2987 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 2988 case relocInfo::type_mask: return "type_bit_mask"; 2989 2990 default: 2991 break; 2992 } 2993 } 2994 return have_one ? "other" : NULL; 2995 } 2996 2997 // Return the last scope in (begin..end] 2998 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2999 PcDesc* p = pc_desc_near(begin+1); 3000 if (p != NULL && p->real_pc(this) <= end) { 3001 return new ScopeDesc(this, p); 3002 } 3003 return NULL; 3004 } 3005 3006 const char* nmethod::nmethod_section_label(address pos) const { 3007 const char* label = NULL; 3008 if (pos == code_begin()) label = "[Instructions begin]"; 3009 if (pos == entry_point()) label = "[Entry Point]"; 3010 if (pos == inline_entry_point()) label = "[Inline Entry Point]"; 3011 if (pos == verified_entry_point()) label = "[Verified Entry Point]"; 3012 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]"; 3013 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]"; 3014 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]"; 3015 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]"; 3016 // Check stub_code before checking exception_handler or deopt_handler. 3017 if (pos == this->stub_begin()) label = "[Stub Code]"; 3018 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]"; 3019 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]"; 3020 return label; 3021 } 3022 3023 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) { 3024 if (pos == entry) { 3025 stream->bol(); 3026 stream->print_cr("%s", label); 3027 return 1; 3028 } else { 3029 return 0; 3030 } 3031 } 3032 3033 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const { 3034 if (print_section_labels) { 3035 int n = 0; 3036 // Multiple entry points may be at the same position. Print them all. 3037 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]"); 3038 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]"); 3039 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]"); 3040 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]"); 3041 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]"); 3042 if (n == 0) { 3043 const char* label = nmethod_section_label(block_begin); 3044 if (label != NULL) { 3045 stream->bol(); 3046 stream->print_cr("%s", label); 3047 } 3048 } 3049 } 3050 3051 Method* m = method(); 3052 if (m == NULL || is_osr_method()) { 3053 return; 3054 } 3055 3056 // Print the name of the method (only once) 3057 address low = MIN4(entry_point(), verified_entry_point(), verified_inline_entry_point(), verified_inline_ro_entry_point()); 3058 low = MIN2(low, inline_entry_point()); 3059 assert(low != 0, "sanity"); 3060 if (block_begin == low) { 3061 stream->print(" # "); 3062 m->print_value_on(stream); 3063 stream->cr(); 3064 } 3065 3066 // Print the arguments for the 3 types of verified entry points 3067 CompiledEntrySignature ces(m); 3068 ces.compute_calling_conventions(); 3069 const GrowableArray<SigEntry>* sig_cc; 3070 const VMRegPair* regs; 3071 if (block_begin == verified_entry_point()) { 3072 sig_cc = &ces.sig_cc(); 3073 regs = ces.regs_cc(); 3074 } else if (block_begin == verified_inline_entry_point()) { 3075 sig_cc = &ces.sig(); 3076 regs = ces.regs(); 3077 } else if (block_begin == verified_inline_ro_entry_point()) { 3078 sig_cc = &ces.sig_cc_ro(); 3079 regs = ces.regs_cc_ro(); 3080 } else { 3081 return; 3082 } 3083 3084 bool has_this = !m->is_static(); 3085 if (ces.has_inline_recv() && block_begin == verified_entry_point()) { 3086 // <this> argument is scalarized for verified_entry_point() 3087 has_this = false; 3088 } 3089 const char* spname = "sp"; // make arch-specific? 3090 int stack_slot_offset = this->frame_size() * wordSize; 3091 int tab1 = 14, tab2 = 24; 3092 int sig_index = 0; 3093 int arg_index = has_this ? -1 : 0; 3094 bool did_old_sp = false; 3095 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) { 3096 bool at_this = (arg_index == -1); 3097 bool at_old_sp = false; 3098 BasicType t = (*sig)._bt; 3099 if (at_this) { 3100 stream->print(" # this: "); 3101 } else { 3102 stream->print(" # parm%d: ", arg_index); 3103 } 3104 stream->move_to(tab1); 3105 VMReg fst = regs[sig_index].first(); 3106 VMReg snd = regs[sig_index].second(); 3107 if (fst->is_reg()) { 3108 stream->print("%s", fst->name()); 3109 if (snd->is_valid()) { 3110 stream->print(":%s", snd->name()); 3111 } 3112 } else if (fst->is_stack()) { 3113 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3114 if (offset == stack_slot_offset) at_old_sp = true; 3115 stream->print("[%s+0x%x]", spname, offset); 3116 } else { 3117 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3118 } 3119 stream->print(" "); 3120 stream->move_to(tab2); 3121 stream->print("= "); 3122 if (at_this) { 3123 m->method_holder()->print_value_on(stream); 3124 } else { 3125 bool did_name = false; 3126 if (is_reference_type(t)) { 3127 Symbol* name = (*sig)._symbol; 3128 name->print_value_on(stream); 3129 did_name = true; 3130 } 3131 if (!did_name) 3132 stream->print("%s", type2name(t)); 3133 } 3134 if (at_old_sp) { 3135 stream->print(" (%s of caller)", spname); 3136 did_old_sp = true; 3137 } 3138 stream->cr(); 3139 sig_index += type2size[t]; 3140 arg_index += 1; 3141 } 3142 if (!did_old_sp) { 3143 stream->print(" # "); 3144 stream->move_to(tab1); 3145 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3146 stream->print(" (%s of caller)", spname); 3147 stream->cr(); 3148 } 3149 } 3150 3151 // Returns whether this nmethod has code comments. 3152 bool nmethod::has_code_comment(address begin, address end) { 3153 // scopes? 3154 ScopeDesc* sd = scope_desc_in(begin, end); 3155 if (sd != NULL) return true; 3156 3157 // relocations? 3158 const char* str = reloc_string_for(begin, end); 3159 if (str != NULL) return true; 3160 3161 // implicit exceptions? 3162 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin()); 3163 if (cont_offset != 0) return true; 3164 3165 return false; 3166 } 3167 3168 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) { 3169 ImplicitExceptionTable implicit_table(this); 3170 int pc_offset = begin - code_begin(); 3171 int cont_offset = implicit_table.continuation_offset(pc_offset); 3172 bool oop_map_required = false; 3173 if (cont_offset != 0) { 3174 st->move_to(column, 6, 0); 3175 if (pc_offset == cont_offset) { 3176 st->print("; implicit exception: deoptimizes"); 3177 oop_map_required = true; 3178 } else { 3179 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3180 } 3181 } 3182 3183 // Find an oopmap in (begin, end]. We use the odd half-closed 3184 // interval so that oop maps and scope descs which are tied to the 3185 // byte after a call are printed with the call itself. OopMaps 3186 // associated with implicit exceptions are printed with the implicit 3187 // instruction. 3188 address base = code_begin(); 3189 ImmutableOopMapSet* oms = oop_maps(); 3190 if (oms != NULL) { 3191 for (int i = 0, imax = oms->count(); i < imax; i++) { 3192 const ImmutableOopMapPair* pair = oms->pair_at(i); 3193 const ImmutableOopMap* om = pair->get_from(oms); 3194 address pc = base + pair->pc_offset(); 3195 if (pc >= begin) { 3196 #if INCLUDE_JVMCI 3197 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset(); 3198 #else 3199 bool is_implicit_deopt = false; 3200 #endif 3201 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) { 3202 st->move_to(column, 6, 0); 3203 st->print("; "); 3204 om->print_on(st); 3205 oop_map_required = false; 3206 } 3207 } 3208 if (pc > end) { 3209 break; 3210 } 3211 } 3212 } 3213 assert(!oop_map_required, "missed oopmap"); 3214 3215 Thread* thread = Thread::current(); 3216 3217 // Print any debug info present at this pc. 3218 ScopeDesc* sd = scope_desc_in(begin, end); 3219 if (sd != NULL) { 3220 st->move_to(column, 6, 0); 3221 if (sd->bci() == SynchronizationEntryBCI) { 3222 st->print(";*synchronization entry"); 3223 } else if (sd->bci() == AfterBci) { 3224 st->print(";* method exit (unlocked if synchronized)"); 3225 } else if (sd->bci() == UnwindBci) { 3226 st->print(";* unwind (locked if synchronized)"); 3227 } else if (sd->bci() == AfterExceptionBci) { 3228 st->print(";* unwind (unlocked if synchronized)"); 3229 } else if (sd->bci() == UnknownBci) { 3230 st->print(";* unknown"); 3231 } else if (sd->bci() == InvalidFrameStateBci) { 3232 st->print(";* invalid frame state"); 3233 } else { 3234 if (sd->method() == NULL) { 3235 st->print("method is NULL"); 3236 } else if (sd->method()->is_native()) { 3237 st->print("method is native"); 3238 } else { 3239 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3240 st->print(";*%s", Bytecodes::name(bc)); 3241 switch (bc) { 3242 case Bytecodes::_invokevirtual: 3243 case Bytecodes::_invokespecial: 3244 case Bytecodes::_invokestatic: 3245 case Bytecodes::_invokeinterface: 3246 { 3247 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci()); 3248 st->print(" "); 3249 if (invoke.name() != NULL) 3250 invoke.name()->print_symbol_on(st); 3251 else 3252 st->print("<UNKNOWN>"); 3253 break; 3254 } 3255 case Bytecodes::_getfield: 3256 case Bytecodes::_putfield: 3257 case Bytecodes::_getstatic: 3258 case Bytecodes::_putstatic: 3259 { 3260 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci()); 3261 st->print(" "); 3262 if (field.name() != NULL) 3263 field.name()->print_symbol_on(st); 3264 else 3265 st->print("<UNKNOWN>"); 3266 } 3267 default: 3268 break; 3269 } 3270 } 3271 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized()); 3272 } 3273 3274 // Print all scopes 3275 for (;sd != NULL; sd = sd->sender()) { 3276 st->move_to(column, 6, 0); 3277 st->print("; -"); 3278 if (sd->should_reexecute()) { 3279 st->print(" (reexecute)"); 3280 } 3281 if (sd->method() == NULL) { 3282 st->print("method is NULL"); 3283 } else { 3284 sd->method()->print_short_name(st); 3285 } 3286 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3287 if (lineno != -1) { 3288 st->print("@%d (line %d)", sd->bci(), lineno); 3289 } else { 3290 st->print("@%d", sd->bci()); 3291 } 3292 st->cr(); 3293 } 3294 } 3295 3296 // Print relocation information 3297 // Prevent memory leak: allocating without ResourceMark. 3298 ResourceMark rm; 3299 const char* str = reloc_string_for(begin, end); 3300 if (str != NULL) { 3301 if (sd != NULL) st->cr(); 3302 st->move_to(column, 6, 0); 3303 st->print("; {%s}", str); 3304 } 3305 } 3306 3307 #endif 3308 3309 class DirectNativeCallWrapper: public NativeCallWrapper { 3310 private: 3311 NativeCall* _call; 3312 3313 public: 3314 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 3315 3316 virtual address destination() const { return _call->destination(); } 3317 virtual address instruction_address() const { return _call->instruction_address(); } 3318 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 3319 virtual address return_address() const { return _call->return_address(); } 3320 3321 virtual address get_resolve_call_stub(bool is_optimized) const { 3322 if (is_optimized) { 3323 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 3324 } 3325 return SharedRuntime::get_resolve_virtual_call_stub(); 3326 } 3327 3328 virtual void set_destination_mt_safe(address dest) { 3329 _call->set_destination_mt_safe(dest); 3330 } 3331 3332 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 3333 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3334 { 3335 csc->set_to_interpreted(method, info.entry()); 3336 } 3337 } 3338 3339 virtual void verify() const { 3340 // make sure code pattern is actually a call imm32 instruction 3341 _call->verify(); 3342 _call->verify_alignment(); 3343 } 3344 3345 virtual void verify_resolve_call(address dest) const { 3346 CodeBlob* db = CodeCache::find_blob(dest); 3347 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 3348 } 3349 3350 virtual bool is_call_to_interpreted(address dest) const { 3351 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 3352 return cb->contains(dest); 3353 } 3354 3355 virtual bool is_safe_for_patching() const { return false; } 3356 3357 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 3358 return nativeMovConstReg_at(r->cached_value()); 3359 } 3360 3361 virtual void *get_data(NativeInstruction* instruction) const { 3362 return (void*)((NativeMovConstReg*) instruction)->data(); 3363 } 3364 3365 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 3366 ((NativeMovConstReg*) instruction)->set_data(data); 3367 } 3368 }; 3369 3370 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 3371 return new DirectNativeCallWrapper((NativeCall*) call); 3372 } 3373 3374 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 3375 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 3376 } 3377 3378 address nmethod::call_instruction_address(address pc) const { 3379 if (NativeCall::is_call_before(pc)) { 3380 NativeCall *ncall = nativeCall_before(pc); 3381 return ncall->instruction_address(); 3382 } 3383 return NULL; 3384 } 3385 3386 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 3387 return CompiledDirectStaticCall::at(call_site); 3388 } 3389 3390 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 3391 return CompiledDirectStaticCall::at(call_site); 3392 } 3393 3394 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 3395 return CompiledDirectStaticCall::before(return_addr); 3396 } 3397 3398 #if defined(SUPPORT_DATA_STRUCTS) 3399 void nmethod::print_value_on(outputStream* st) const { 3400 st->print("nmethod"); 3401 print_on(st, NULL); 3402 } 3403 #endif 3404 3405 #ifndef PRODUCT 3406 3407 void nmethod::print_calls(outputStream* st) { 3408 RelocIterator iter(this); 3409 while (iter.next()) { 3410 switch (iter.type()) { 3411 case relocInfo::virtual_call_type: 3412 case relocInfo::opt_virtual_call_type: { 3413 CompiledICLocker ml_verify(this); 3414 CompiledIC_at(&iter)->print(); 3415 break; 3416 } 3417 case relocInfo::static_call_type: 3418 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3419 CompiledDirectStaticCall::at(iter.reloc())->print(); 3420 break; 3421 default: 3422 break; 3423 } 3424 } 3425 } 3426 3427 void nmethod::print_statistics() { 3428 ttyLocker ttyl; 3429 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3430 native_nmethod_stats.print_native_nmethod_stats(); 3431 #ifdef COMPILER1 3432 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3433 #endif 3434 #ifdef COMPILER2 3435 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3436 #endif 3437 #if INCLUDE_JVMCI 3438 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3439 #endif 3440 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3441 DebugInformationRecorder::print_statistics(); 3442 #ifndef PRODUCT 3443 pc_nmethod_stats.print_pc_stats(); 3444 #endif 3445 Dependencies::print_statistics(); 3446 if (xtty != NULL) xtty->tail("statistics"); 3447 } 3448 3449 #endif // !PRODUCT 3450 3451 #if INCLUDE_JVMCI 3452 void nmethod::update_speculation(JavaThread* thread) { 3453 jlong speculation = thread->pending_failed_speculation(); 3454 if (speculation != 0) { 3455 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list"); 3456 jvmci_nmethod_data()->add_failed_speculation(this, speculation); 3457 thread->set_pending_failed_speculation(0); 3458 } 3459 } 3460 3461 const char* nmethod::jvmci_name() { 3462 if (jvmci_nmethod_data() != NULL) { 3463 return jvmci_nmethod_data()->name(); 3464 } 3465 return NULL; 3466 } 3467 #endif