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