1 /* 2 * Copyright (c) 1997, 2021, 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 "jvm.h" 27 #include "asm/assembler.inline.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/compiledIC.hpp" 30 #include "code/compiledMethod.inline.hpp" 31 #include "code/dependencies.hpp" 32 #include "code/nativeInst.hpp" 33 #include "code/nmethod.hpp" 34 #include "code/scopeDesc.hpp" 35 #include "compiler/abstractCompiler.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "compiler/compileLog.hpp" 38 #include "compiler/compilerDirectives.hpp" 39 #include "compiler/directivesParser.hpp" 40 #include "compiler/disassembler.hpp" 41 #include "compiler/oopMap.hpp" 42 #include "gc/shared/collectedHeap.hpp" 43 #include "interpreter/bytecode.hpp" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "memory/allocation.inline.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/access.inline.hpp" 50 #include "oops/klass.inline.hpp" 51 #include "oops/method.inline.hpp" 52 #include "oops/methodData.hpp" 53 #include "oops/oop.inline.hpp" 54 #include "prims/jvmtiImpl.hpp" 55 #include "prims/jvmtiThreadState.hpp" 56 #include "prims/methodHandles.hpp" 57 #include "runtime/atomic.hpp" 58 #include "runtime/deoptimization.hpp" 59 #include "runtime/flags/flagSetting.hpp" 60 #include "runtime/frame.inline.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/jniHandles.inline.hpp" 63 #include "runtime/orderAccess.hpp" 64 #include "runtime/os.hpp" 65 #include "runtime/safepointVerifiers.hpp" 66 #include "runtime/serviceThread.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/signature.hpp" 69 #include "runtime/sweeper.hpp" 70 #include "runtime/threadWXSetters.inline.hpp" 71 #include "runtime/vmThread.hpp" 72 #include "utilities/align.hpp" 73 #include "utilities/copy.hpp" 74 #include "utilities/dtrace.hpp" 75 #include "utilities/events.hpp" 76 #include "utilities/globalDefinitions.hpp" 77 #include "utilities/resourceHash.hpp" 78 #include "utilities/xmlstream.hpp" 79 #if INCLUDE_JVMCI 80 #include "jvmci/jvmciRuntime.hpp" 81 #endif 82 83 #ifdef DTRACE_ENABLED 84 85 // Only bother with this argument setup if dtrace is available 86 87 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 88 { \ 89 Method* m = (method); \ 90 if (m != NULL) { \ 91 Symbol* klass_name = m->klass_name(); \ 92 Symbol* name = m->name(); \ 93 Symbol* signature = m->signature(); \ 94 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 95 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 96 (char *) name->bytes(), name->utf8_length(), \ 97 (char *) signature->bytes(), signature->utf8_length()); \ 98 } \ 99 } 100 101 #else // ndef DTRACE_ENABLED 102 103 #define DTRACE_METHOD_UNLOAD_PROBE(method) 104 105 #endif 106 107 //--------------------------------------------------------------------------------- 108 // NMethod statistics 109 // They are printed under various flags, including: 110 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 111 // (In the latter two cases, they like other stats are printed to the log only.) 112 113 #ifndef PRODUCT 114 // These variables are put into one block to reduce relocations 115 // and make it simpler to print from the debugger. 116 struct java_nmethod_stats_struct { 117 int nmethod_count; 118 int total_size; 119 int relocation_size; 120 int consts_size; 121 int insts_size; 122 int stub_size; 123 int scopes_data_size; 124 int scopes_pcs_size; 125 int dependencies_size; 126 int handler_table_size; 127 int nul_chk_table_size; 128 #if INCLUDE_JVMCI 129 int speculations_size; 130 int jvmci_data_size; 131 #endif 132 int oops_size; 133 int metadata_size; 134 135 void note_nmethod(nmethod* nm) { 136 nmethod_count += 1; 137 total_size += nm->size(); 138 relocation_size += nm->relocation_size(); 139 consts_size += nm->consts_size(); 140 insts_size += nm->insts_size(); 141 stub_size += nm->stub_size(); 142 oops_size += nm->oops_size(); 143 metadata_size += nm->metadata_size(); 144 scopes_data_size += nm->scopes_data_size(); 145 scopes_pcs_size += nm->scopes_pcs_size(); 146 dependencies_size += nm->dependencies_size(); 147 handler_table_size += nm->handler_table_size(); 148 nul_chk_table_size += nm->nul_chk_table_size(); 149 #if INCLUDE_JVMCI 150 speculations_size += nm->speculations_size(); 151 jvmci_data_size += nm->jvmci_data_size(); 152 #endif 153 } 154 void print_nmethod_stats(const char* name) { 155 if (nmethod_count == 0) return; 156 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 157 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 158 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 159 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 160 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 161 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 162 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 163 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 164 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 165 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 166 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 167 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 168 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 169 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 170 #if INCLUDE_JVMCI 171 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size); 172 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size); 173 #endif 174 } 175 }; 176 177 struct native_nmethod_stats_struct { 178 int native_nmethod_count; 179 int native_total_size; 180 int native_relocation_size; 181 int native_insts_size; 182 int native_oops_size; 183 int native_metadata_size; 184 void note_native_nmethod(nmethod* nm) { 185 native_nmethod_count += 1; 186 native_total_size += nm->size(); 187 native_relocation_size += nm->relocation_size(); 188 native_insts_size += nm->insts_size(); 189 native_oops_size += nm->oops_size(); 190 native_metadata_size += nm->metadata_size(); 191 } 192 void print_native_nmethod_stats() { 193 if (native_nmethod_count == 0) return; 194 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 195 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 196 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 197 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 198 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 199 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 200 } 201 }; 202 203 struct pc_nmethod_stats_struct { 204 int pc_desc_resets; // number of resets (= number of caches) 205 int pc_desc_queries; // queries to nmethod::find_pc_desc 206 int pc_desc_approx; // number of those which have approximate true 207 int pc_desc_repeats; // number of _pc_descs[0] hits 208 int pc_desc_hits; // number of LRU cache hits 209 int pc_desc_tests; // total number of PcDesc examinations 210 int pc_desc_searches; // total number of quasi-binary search steps 211 int pc_desc_adds; // number of LUR cache insertions 212 213 void print_pc_stats() { 214 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 215 pc_desc_queries, 216 (double)(pc_desc_tests + pc_desc_searches) 217 / pc_desc_queries); 218 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 219 pc_desc_resets, 220 pc_desc_queries, pc_desc_approx, 221 pc_desc_repeats, pc_desc_hits, 222 pc_desc_tests, pc_desc_searches, pc_desc_adds); 223 } 224 }; 225 226 #ifdef COMPILER1 227 static java_nmethod_stats_struct c1_java_nmethod_stats; 228 #endif 229 #ifdef COMPILER2 230 static java_nmethod_stats_struct c2_java_nmethod_stats; 231 #endif 232 #if INCLUDE_JVMCI 233 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 234 #endif 235 static java_nmethod_stats_struct unknown_java_nmethod_stats; 236 237 static native_nmethod_stats_struct native_nmethod_stats; 238 static pc_nmethod_stats_struct pc_nmethod_stats; 239 240 static void note_java_nmethod(nmethod* nm) { 241 #ifdef COMPILER1 242 if (nm->is_compiled_by_c1()) { 243 c1_java_nmethod_stats.note_nmethod(nm); 244 } else 245 #endif 246 #ifdef COMPILER2 247 if (nm->is_compiled_by_c2()) { 248 c2_java_nmethod_stats.note_nmethod(nm); 249 } else 250 #endif 251 #if INCLUDE_JVMCI 252 if (nm->is_compiled_by_jvmci()) { 253 jvmci_java_nmethod_stats.note_nmethod(nm); 254 } else 255 #endif 256 { 257 unknown_java_nmethod_stats.note_nmethod(nm); 258 } 259 } 260 #endif // !PRODUCT 261 262 //--------------------------------------------------------------------------------- 263 264 265 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 266 assert(pc != NULL, "Must be non null"); 267 assert(exception.not_null(), "Must be non null"); 268 assert(handler != NULL, "Must be non null"); 269 270 _count = 0; 271 _exception_type = exception->klass(); 272 _next = NULL; 273 _purge_list_next = NULL; 274 275 add_address_and_handler(pc,handler); 276 } 277 278 279 address ExceptionCache::match(Handle exception, address pc) { 280 assert(pc != NULL,"Must be non null"); 281 assert(exception.not_null(),"Must be non null"); 282 if (exception->klass() == exception_type()) { 283 return (test_address(pc)); 284 } 285 286 return NULL; 287 } 288 289 290 bool ExceptionCache::match_exception_with_space(Handle exception) { 291 assert(exception.not_null(),"Must be non null"); 292 if (exception->klass() == exception_type() && count() < cache_size) { 293 return true; 294 } 295 return false; 296 } 297 298 299 address ExceptionCache::test_address(address addr) { 300 int limit = count(); 301 for (int i = 0; i < limit; i++) { 302 if (pc_at(i) == addr) { 303 return handler_at(i); 304 } 305 } 306 return NULL; 307 } 308 309 310 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 311 if (test_address(addr) == handler) return true; 312 313 int index = count(); 314 if (index < cache_size) { 315 set_pc_at(index, addr); 316 set_handler_at(index, handler); 317 increment_count(); 318 return true; 319 } 320 return false; 321 } 322 323 ExceptionCache* ExceptionCache::next() { 324 return Atomic::load(&_next); 325 } 326 327 void ExceptionCache::set_next(ExceptionCache *ec) { 328 Atomic::store(&_next, ec); 329 } 330 331 //----------------------------------------------------------------------------- 332 333 334 // Helper used by both find_pc_desc methods. 335 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 336 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 337 if (!approximate) 338 return pc->pc_offset() == pc_offset; 339 else 340 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 341 } 342 343 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 344 if (initial_pc_desc == NULL) { 345 _pc_descs[0] = NULL; // native method; no PcDescs at all 346 return; 347 } 348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 349 // reset the cache by filling it with benign (non-null) values 350 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 351 for (int i = 0; i < cache_size; i++) 352 _pc_descs[i] = initial_pc_desc; 353 } 354 355 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 356 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 357 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 358 359 // Note: one might think that caching the most recently 360 // read value separately would be a win, but one would be 361 // wrong. When many threads are updating it, the cache 362 // line it's in would bounce between caches, negating 363 // any benefit. 364 365 // In order to prevent race conditions do not load cache elements 366 // repeatedly, but use a local copy: 367 PcDesc* res; 368 369 // Step one: Check the most recently added value. 370 res = _pc_descs[0]; 371 if (res == NULL) return NULL; // native method; no PcDescs at all 372 if (match_desc(res, pc_offset, approximate)) { 373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 374 return res; 375 } 376 377 // Step two: Check the rest of the LRU cache. 378 for (int i = 1; i < cache_size; ++i) { 379 res = _pc_descs[i]; 380 if (res->pc_offset() < 0) break; // optimization: skip empty cache 381 if (match_desc(res, pc_offset, approximate)) { 382 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 383 return res; 384 } 385 } 386 387 // Report failure. 388 return NULL; 389 } 390 391 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 393 // Update the LRU cache by shifting pc_desc forward. 394 for (int i = 0; i < cache_size; i++) { 395 PcDesc* next = _pc_descs[i]; 396 _pc_descs[i] = pc_desc; 397 pc_desc = next; 398 } 399 } 400 401 // adjust pcs_size so that it is a multiple of both oopSize and 402 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 403 // of oopSize, then 2*sizeof(PcDesc) is) 404 static int adjust_pcs_size(int pcs_size) { 405 int nsize = align_up(pcs_size, oopSize); 406 if ((nsize % sizeof(PcDesc)) != 0) { 407 nsize = pcs_size + sizeof(PcDesc); 408 } 409 assert((nsize % oopSize) == 0, "correct alignment"); 410 return nsize; 411 } 412 413 414 int nmethod::total_size() const { 415 return 416 consts_size() + 417 insts_size() + 418 stub_size() + 419 scopes_data_size() + 420 scopes_pcs_size() + 421 handler_table_size() + 422 nul_chk_table_size(); 423 } 424 425 address* nmethod::orig_pc_addr(const frame* fr) { 426 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); 427 } 428 429 const char* nmethod::compile_kind() const { 430 if (is_osr_method()) return "osr"; 431 if (method() != NULL && is_native_method()) return "c2n"; 432 return NULL; 433 } 434 435 // Fill in default values for various flag fields 436 void nmethod::init_defaults() { 437 _state = not_installed; 438 _has_flushed_dependencies = 0; 439 _lock_count = 0; 440 _stack_traversal_mark = 0; 441 _load_reported = false; // jvmti state 442 _unload_reported = false; 443 444 #ifdef ASSERT 445 _oops_are_stale = false; 446 #endif 447 448 _oops_do_mark_link = NULL; 449 _osr_link = NULL; 450 #if INCLUDE_RTM_OPT 451 _rtm_state = NoRTM; 452 #endif 453 } 454 455 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 456 int compile_id, 457 CodeBuffer *code_buffer, 458 int vep_offset, 459 int frame_complete, 460 int frame_size, 461 ByteSize basic_lock_owner_sp_offset, 462 ByteSize basic_lock_sp_offset, 463 OopMapSet* oop_maps) { 464 code_buffer->finalize_oop_references(method); 465 // create nmethod 466 nmethod* nm = NULL; 467 { 468 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 469 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 470 471 CodeOffsets offsets; 472 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 473 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 474 nm = new (native_nmethod_size, CompLevel_none) 475 nmethod(method(), compiler_none, native_nmethod_size, 476 compile_id, &offsets, 477 code_buffer, frame_size, 478 basic_lock_owner_sp_offset, 479 basic_lock_sp_offset, 480 oop_maps); 481 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 482 } 483 484 if (nm != NULL) { 485 // verify nmethod 486 debug_only(nm->verify();) // might block 487 488 nm->log_new_nmethod(); 489 } 490 return nm; 491 } 492 493 nmethod* nmethod::new_nmethod(const methodHandle& method, 494 int compile_id, 495 int entry_bci, 496 CodeOffsets* offsets, 497 int orig_pc_offset, 498 DebugInformationRecorder* debug_info, 499 Dependencies* dependencies, 500 CodeBuffer* code_buffer, int frame_size, 501 OopMapSet* oop_maps, 502 ExceptionHandlerTable* handler_table, 503 ImplicitExceptionTable* nul_chk_table, 504 AbstractCompiler* compiler, 505 int comp_level, 506 const GrowableArrayView<RuntimeStub*>& native_invokers 507 #if INCLUDE_JVMCI 508 , char* speculations, 509 int speculations_len, 510 int nmethod_mirror_index, 511 const char* nmethod_mirror_name, 512 FailedSpeculation** failed_speculations 513 #endif 514 ) 515 { 516 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 517 code_buffer->finalize_oop_references(method); 518 // create nmethod 519 nmethod* nm = NULL; 520 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 521 #if INCLUDE_JVMCI 522 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name); 523 #endif 524 int nmethod_size = 525 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 526 + adjust_pcs_size(debug_info->pcs_size()) 527 + align_up((int)dependencies->size_in_bytes(), oopSize) 528 + align_up(checked_cast<int>(native_invokers.data_size_in_bytes()), oopSize) 529 + align_up(handler_table->size_in_bytes() , oopSize) 530 + align_up(nul_chk_table->size_in_bytes() , oopSize) 531 #if INCLUDE_JVMCI 532 + align_up(speculations_len , oopSize) 533 + align_up(jvmci_data_size , oopSize) 534 #endif 535 + align_up(debug_info->data_size() , oopSize); 536 537 nm = new (nmethod_size, comp_level) 538 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 539 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 540 oop_maps, 541 handler_table, 542 nul_chk_table, 543 compiler, 544 comp_level, 545 native_invokers 546 #if INCLUDE_JVMCI 547 , speculations, 548 speculations_len, 549 jvmci_data_size 550 #endif 551 ); 552 553 if (nm != NULL) { 554 #if INCLUDE_JVMCI 555 if (compiler->is_jvmci()) { 556 // Initialize the JVMCINMethodData object inlined into nm 557 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations); 558 } 559 #endif 560 // To make dependency checking during class loading fast, record 561 // the nmethod dependencies in the classes it is dependent on. 562 // This allows the dependency checking code to simply walk the 563 // class hierarchy above the loaded class, checking only nmethods 564 // which are dependent on those classes. The slow way is to 565 // check every nmethod for dependencies which makes it linear in 566 // the number of methods compiled. For applications with a lot 567 // classes the slow way is too slow. 568 for (Dependencies::DepStream deps(nm); deps.next(); ) { 569 if (deps.type() == Dependencies::call_site_target_value) { 570 // CallSite dependencies are managed on per-CallSite instance basis. 571 oop call_site = deps.argument_oop(0); 572 MethodHandles::add_dependent_nmethod(call_site, nm); 573 } else { 574 Klass* klass = deps.context_type(); 575 if (klass == NULL) { 576 continue; // ignore things like evol_method 577 } 578 // record this nmethod as dependent on this klass 579 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 580 } 581 } 582 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 583 } 584 } 585 // Do verification and logging outside CodeCache_lock. 586 if (nm != NULL) { 587 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 588 DEBUG_ONLY(nm->verify();) 589 nm->log_new_nmethod(); 590 } 591 return nm; 592 } 593 594 // For native wrappers 595 nmethod::nmethod( 596 Method* method, 597 CompilerType type, 598 int nmethod_size, 599 int compile_id, 600 CodeOffsets* offsets, 601 CodeBuffer* code_buffer, 602 int frame_size, 603 ByteSize basic_lock_owner_sp_offset, 604 ByteSize basic_lock_sp_offset, 605 OopMapSet* oop_maps ) 606 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 607 _is_unloading_state(0), 608 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 609 _native_basic_lock_sp_offset(basic_lock_sp_offset) 610 { 611 { 612 int scopes_data_offset = 0; 613 int deoptimize_offset = 0; 614 int deoptimize_mh_offset = 0; 615 616 debug_only(NoSafepointVerifier nsv;) 617 assert_locked_or_safepoint(CodeCache_lock); 618 619 init_defaults(); 620 _entry_bci = InvocationEntryBci; 621 // We have no exception handler or deopt handler make the 622 // values something that will never match a pc like the nmethod vtable entry 623 _exception_offset = 0; 624 _orig_pc_offset = 0; 625 626 _consts_offset = data_offset(); 627 _stub_offset = data_offset(); 628 _oops_offset = data_offset(); 629 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 630 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 631 _scopes_pcs_offset = scopes_data_offset; 632 _dependencies_offset = _scopes_pcs_offset; 633 _native_invokers_offset = _dependencies_offset; 634 _handler_table_offset = _native_invokers_offset; 635 _nul_chk_table_offset = _handler_table_offset; 636 #if INCLUDE_JVMCI 637 _speculations_offset = _nul_chk_table_offset; 638 _jvmci_data_offset = _speculations_offset; 639 _nmethod_end_offset = _jvmci_data_offset; 640 #else 641 _nmethod_end_offset = _nul_chk_table_offset; 642 #endif 643 _compile_id = compile_id; 644 _comp_level = CompLevel_none; 645 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 646 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 647 648 assert(!method->has_scalarized_args(), "scalarized native wrappers not supported yet"); // for the next 3 fields 649 _inline_entry_point = _entry_point; 650 _verified_inline_entry_point = _verified_entry_point; 651 _verified_inline_ro_entry_point = _verified_entry_point; 652 653 _osr_entry_point = NULL; 654 _exception_cache = NULL; 655 _pc_desc_container.reset_to(NULL); 656 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 657 658 _scopes_data_begin = (address) this + scopes_data_offset; 659 _deopt_handler_begin = (address) this + deoptimize_offset; 660 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 661 662 code_buffer->copy_code_and_locs_to(this); 663 code_buffer->copy_values_to(this); 664 665 clear_unloading_state(); 666 667 Universe::heap()->register_nmethod(this); 668 debug_only(Universe::heap()->verify_nmethod(this)); 669 670 CodeCache::commit(this); 671 } 672 673 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 674 ttyLocker ttyl; // keep the following output all in one block 675 // This output goes directly to the tty, not the compiler log. 676 // To enable tools to match it up with the compilation activity, 677 // be sure to tag this tty output with the compile ID. 678 if (xtty != NULL) { 679 xtty->begin_head("print_native_nmethod"); 680 xtty->method(_method); 681 xtty->stamp(); 682 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 683 } 684 // Print the header part, then print the requested information. 685 // This is both handled in decode2(), called via print_code() -> decode() 686 if (PrintNativeNMethods) { 687 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------"); 688 print_code(); 689 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 690 #if defined(SUPPORT_DATA_STRUCTS) 691 if (AbstractDisassembler::show_structs()) { 692 if (oop_maps != NULL) { 693 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning 694 oop_maps->print_on(tty); 695 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 696 } 697 } 698 #endif 699 } else { 700 print(); // print the header part only. 701 } 702 #if defined(SUPPORT_DATA_STRUCTS) 703 if (AbstractDisassembler::show_structs()) { 704 if (PrintRelocations) { 705 print_relocations(); 706 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 707 } 708 } 709 #endif 710 if (xtty != NULL) { 711 xtty->tail("print_native_nmethod"); 712 } 713 } 714 } 715 716 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 717 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 718 } 719 720 nmethod::nmethod( 721 Method* method, 722 CompilerType type, 723 int nmethod_size, 724 int compile_id, 725 int entry_bci, 726 CodeOffsets* offsets, 727 int orig_pc_offset, 728 DebugInformationRecorder* debug_info, 729 Dependencies* dependencies, 730 CodeBuffer *code_buffer, 731 int frame_size, 732 OopMapSet* oop_maps, 733 ExceptionHandlerTable* handler_table, 734 ImplicitExceptionTable* nul_chk_table, 735 AbstractCompiler* compiler, 736 int comp_level, 737 const GrowableArrayView<RuntimeStub*>& native_invokers 738 #if INCLUDE_JVMCI 739 , char* speculations, 740 int speculations_len, 741 int jvmci_data_size 742 #endif 743 ) 744 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 745 _is_unloading_state(0), 746 _native_receiver_sp_offset(in_ByteSize(-1)), 747 _native_basic_lock_sp_offset(in_ByteSize(-1)) 748 { 749 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 750 { 751 debug_only(NoSafepointVerifier nsv;) 752 assert_locked_or_safepoint(CodeCache_lock); 753 754 _deopt_handler_begin = (address) this; 755 _deopt_mh_handler_begin = (address) this; 756 757 init_defaults(); 758 _entry_bci = entry_bci; 759 _compile_id = compile_id; 760 _comp_level = comp_level; 761 _orig_pc_offset = orig_pc_offset; 762 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 763 764 // Section offsets 765 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 766 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 767 set_ctable_begin(header_begin() + _consts_offset); 768 769 #if INCLUDE_JVMCI 770 if (compiler->is_jvmci()) { 771 // JVMCI might not produce any stub sections 772 if (offsets->value(CodeOffsets::Exceptions) != -1) { 773 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 774 } else { 775 _exception_offset = -1; 776 } 777 if (offsets->value(CodeOffsets::Deopt) != -1) { 778 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 779 } else { 780 _deopt_handler_begin = NULL; 781 } 782 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 783 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 784 } else { 785 _deopt_mh_handler_begin = NULL; 786 } 787 } else 788 #endif 789 { 790 // Exception handler and deopt handler are in the stub section 791 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 792 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 793 794 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 795 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 796 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 797 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 798 } else { 799 _deopt_mh_handler_begin = NULL; 800 } 801 } 802 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 803 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 804 } else { 805 _unwind_handler_offset = -1; 806 } 807 808 _oops_offset = data_offset(); 809 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 810 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 811 812 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 813 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 814 _native_invokers_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes(), oopSize); 815 _handler_table_offset = _native_invokers_offset + align_up(checked_cast<int>(native_invokers.data_size_in_bytes()), oopSize); 816 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 817 #if INCLUDE_JVMCI 818 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 819 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize); 820 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); 821 #else 822 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 823 #endif 824 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 825 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 826 _inline_entry_point = code_begin() + offsets->value(CodeOffsets::Inline_Entry); 827 _verified_inline_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry); 828 _verified_inline_ro_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Inline_Entry_RO); 829 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 830 _exception_cache = NULL; 831 _scopes_data_begin = (address) this + scopes_data_offset; 832 833 _pc_desc_container.reset_to(scopes_pcs_begin()); 834 835 code_buffer->copy_code_and_locs_to(this); 836 // Copy contents of ScopeDescRecorder to nmethod 837 code_buffer->copy_values_to(this); 838 debug_info->copy_to(this); 839 dependencies->copy_to(this); 840 if (native_invokers.is_nonempty()) { // can not get address of zero-length array 841 // Copy native stubs 842 memcpy(native_invokers_begin(), native_invokers.adr_at(0), native_invokers.data_size_in_bytes()); 843 } 844 clear_unloading_state(); 845 846 Universe::heap()->register_nmethod(this); 847 debug_only(Universe::heap()->verify_nmethod(this)); 848 849 CodeCache::commit(this); 850 851 // Copy contents of ExceptionHandlerTable to nmethod 852 handler_table->copy_to(this); 853 nul_chk_table->copy_to(this); 854 855 #if INCLUDE_JVMCI 856 // Copy speculations to nmethod 857 if (speculations_size() != 0) { 858 memcpy(speculations_begin(), speculations, speculations_len); 859 } 860 #endif 861 862 // we use the information of entry points to find out if a method is 863 // static or non static 864 assert(compiler->is_c2() || compiler->is_jvmci() || 865 _method->is_static() == (entry_point() == _verified_entry_point), 866 " entry points must be same for static methods and vice versa"); 867 } 868 } 869 870 // Print a short set of xml attributes to identify this nmethod. The 871 // output should be embedded in some other element. 872 void nmethod::log_identity(xmlStream* log) const { 873 log->print(" compile_id='%d'", compile_id()); 874 const char* nm_kind = compile_kind(); 875 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 876 log->print(" compiler='%s'", compiler_name()); 877 if (TieredCompilation) { 878 log->print(" level='%d'", comp_level()); 879 } 880 #if INCLUDE_JVMCI 881 if (jvmci_nmethod_data() != NULL) { 882 const char* jvmci_name = jvmci_nmethod_data()->name(); 883 if (jvmci_name != NULL) { 884 log->print(" jvmci_mirror_name='"); 885 log->text("%s", jvmci_name); 886 log->print("'"); 887 } 888 } 889 #endif 890 } 891 892 893 #define LOG_OFFSET(log, name) \ 894 if (p2i(name##_end()) - p2i(name##_begin())) \ 895 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 896 p2i(name##_begin()) - p2i(this)) 897 898 899 void nmethod::log_new_nmethod() const { 900 if (LogCompilation && xtty != NULL) { 901 ttyLocker ttyl; 902 xtty->begin_elem("nmethod"); 903 log_identity(xtty); 904 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 905 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 906 907 LOG_OFFSET(xtty, relocation); 908 LOG_OFFSET(xtty, consts); 909 LOG_OFFSET(xtty, insts); 910 LOG_OFFSET(xtty, stub); 911 LOG_OFFSET(xtty, scopes_data); 912 LOG_OFFSET(xtty, scopes_pcs); 913 LOG_OFFSET(xtty, dependencies); 914 LOG_OFFSET(xtty, handler_table); 915 LOG_OFFSET(xtty, nul_chk_table); 916 LOG_OFFSET(xtty, oops); 917 LOG_OFFSET(xtty, metadata); 918 919 xtty->method(method()); 920 xtty->stamp(); 921 xtty->end_elem(); 922 } 923 } 924 925 #undef LOG_OFFSET 926 927 928 // Print out more verbose output usually for a newly created nmethod. 929 void nmethod::print_on(outputStream* st, const char* msg) const { 930 if (st != NULL) { 931 ttyLocker ttyl; 932 if (WizardMode) { 933 CompileTask::print(st, this, msg, /*short_form:*/ true); 934 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 935 } else { 936 CompileTask::print(st, this, msg, /*short_form:*/ false); 937 } 938 } 939 } 940 941 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 942 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 943 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 944 print_nmethod(printnmethods); 945 } 946 } 947 948 void nmethod::print_nmethod(bool printmethod) { 949 run_nmethod_entry_barrier(); // ensure all embedded OOPs are valid before printing 950 951 ttyLocker ttyl; // keep the following output all in one block 952 if (xtty != NULL) { 953 xtty->begin_head("print_nmethod"); 954 log_identity(xtty); 955 xtty->stamp(); 956 xtty->end_head(); 957 } 958 // Print the header part, then print the requested information. 959 // This is both handled in decode2(). 960 if (printmethod) { 961 ResourceMark m; 962 if (is_compiled_by_c1()) { 963 tty->cr(); 964 tty->print_cr("============================= C1-compiled nmethod =============================="); 965 } 966 if (is_compiled_by_jvmci()) { 967 tty->cr(); 968 tty->print_cr("=========================== JVMCI-compiled nmethod ============================="); 969 } 970 tty->print_cr("----------------------------------- Assembly -----------------------------------"); 971 decode2(tty); 972 #if defined(SUPPORT_DATA_STRUCTS) 973 if (AbstractDisassembler::show_structs()) { 974 // Print the oops from the underlying CodeBlob as well. 975 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 976 print_oops(tty); 977 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 978 print_metadata(tty); 979 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 980 print_pcs(); 981 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 982 if (oop_maps() != NULL) { 983 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning 984 oop_maps()->print_on(tty); 985 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 986 } 987 } 988 #endif 989 } else { 990 print(); // print the header part only. 991 } 992 993 #if defined(SUPPORT_DATA_STRUCTS) 994 if (AbstractDisassembler::show_structs()) { 995 methodHandle mh(Thread::current(), _method); 996 if (printmethod || PrintDebugInfo || CompilerOracle::has_option(mh, CompileCommand::PrintDebugInfo)) { 997 print_scopes(); 998 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 999 } 1000 if (printmethod || PrintRelocations || CompilerOracle::has_option(mh, CompileCommand::PrintRelocations)) { 1001 print_relocations(); 1002 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1003 } 1004 if (printmethod || PrintDependencies || CompilerOracle::has_option(mh, CompileCommand::PrintDependencies)) { 1005 print_dependencies(); 1006 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1007 } 1008 if (printmethod && native_invokers_begin() < native_invokers_end()) { 1009 print_native_invokers(); 1010 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1011 } 1012 if (printmethod || PrintExceptionHandlers) { 1013 print_handler_table(); 1014 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1015 print_nul_chk_table(); 1016 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1017 } 1018 1019 if (printmethod) { 1020 print_recorded_oops(); 1021 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1022 print_recorded_metadata(); 1023 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 1024 } 1025 } 1026 #endif 1027 1028 if (xtty != NULL) { 1029 xtty->tail("print_nmethod"); 1030 } 1031 } 1032 1033 1034 // Promote one word from an assembly-time handle to a live embedded oop. 1035 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1036 if (handle == NULL || 1037 // As a special case, IC oops are initialized to 1 or -1. 1038 handle == (jobject) Universe::non_oop_word()) { 1039 *(void**)dest = handle; 1040 } else { 1041 *dest = JNIHandles::resolve_non_null(handle); 1042 } 1043 } 1044 1045 1046 // Have to have the same name because it's called by a template 1047 void nmethod::copy_values(GrowableArray<jobject>* array) { 1048 int length = array->length(); 1049 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1050 oop* dest = oops_begin(); 1051 for (int index = 0 ; index < length; index++) { 1052 initialize_immediate_oop(&dest[index], array->at(index)); 1053 } 1054 1055 // Now we can fix up all the oops in the code. We need to do this 1056 // in the code because the assembler uses jobjects as placeholders. 1057 // The code and relocations have already been initialized by the 1058 // CodeBlob constructor, so it is valid even at this early point to 1059 // iterate over relocations and patch the code. 1060 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1061 } 1062 1063 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1064 int length = array->length(); 1065 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1066 Metadata** dest = metadata_begin(); 1067 for (int index = 0 ; index < length; index++) { 1068 dest[index] = array->at(index); 1069 } 1070 } 1071 1072 void nmethod::free_native_invokers() { 1073 for (RuntimeStub** it = native_invokers_begin(); it < native_invokers_end(); it++) { 1074 CodeCache::free(*it); 1075 } 1076 } 1077 1078 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1079 // re-patch all oop-bearing instructions, just in case some oops moved 1080 RelocIterator iter(this, begin, end); 1081 while (iter.next()) { 1082 if (iter.type() == relocInfo::oop_type) { 1083 oop_Relocation* reloc = iter.oop_reloc(); 1084 if (initialize_immediates && reloc->oop_is_immediate()) { 1085 oop* dest = reloc->oop_addr(); 1086 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest)); 1087 } 1088 // Refresh the oop-related bits of this instruction. 1089 reloc->fix_oop_relocation(); 1090 } else if (iter.type() == relocInfo::metadata_type) { 1091 metadata_Relocation* reloc = iter.metadata_reloc(); 1092 reloc->fix_metadata_relocation(); 1093 } 1094 } 1095 } 1096 1097 1098 void nmethod::verify_clean_inline_caches() { 1099 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1100 1101 ResourceMark rm; 1102 RelocIterator iter(this, oops_reloc_begin()); 1103 while(iter.next()) { 1104 switch(iter.type()) { 1105 case relocInfo::virtual_call_type: 1106 case relocInfo::opt_virtual_call_type: { 1107 CompiledIC *ic = CompiledIC_at(&iter); 1108 // Ok, to lookup references to zombies here 1109 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1110 assert(cb != NULL, "destination not in CodeBlob?"); 1111 nmethod* nm = cb->as_nmethod_or_null(); 1112 if( nm != NULL ) { 1113 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1114 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1115 assert(ic->is_clean(), "IC should be clean"); 1116 } 1117 } 1118 break; 1119 } 1120 case relocInfo::static_call_type: { 1121 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1122 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1123 assert(cb != NULL, "destination not in CodeBlob?"); 1124 nmethod* nm = cb->as_nmethod_or_null(); 1125 if( nm != NULL ) { 1126 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1127 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1128 assert(csc->is_clean(), "IC should be clean"); 1129 } 1130 } 1131 break; 1132 } 1133 default: 1134 break; 1135 } 1136 } 1137 } 1138 1139 // This is a private interface with the sweeper. 1140 void nmethod::mark_as_seen_on_stack() { 1141 assert(is_alive(), "Must be an alive method"); 1142 // Set the traversal mark to ensure that the sweeper does 2 1143 // cleaning passes before moving to zombie. 1144 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1145 } 1146 1147 // Tell if a non-entrant method can be converted to a zombie (i.e., 1148 // there are no activations on the stack, not in use by the VM, 1149 // and not in use by the ServiceThread) 1150 bool nmethod::can_convert_to_zombie() { 1151 // Note that this is called when the sweeper has observed the nmethod to be 1152 // not_entrant. However, with concurrent code cache unloading, the state 1153 // might have moved on to unloaded if it is_unloading(), due to racing 1154 // concurrent GC threads. 1155 assert(is_not_entrant() || is_unloading() || 1156 !Thread::current()->is_Code_cache_sweeper_thread(), 1157 "must be a non-entrant method if called from sweeper"); 1158 1159 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1160 // count can be greater than the stack traversal count before it hits the 1161 // nmethod for the second time. 1162 // If an is_unloading() nmethod is still not_entrant, then it is not safe to 1163 // convert it to zombie due to GC unloading interactions. However, if it 1164 // has become unloaded, then it is okay to convert such nmethods to zombie. 1165 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() && 1166 !is_locked_by_vm() && (!is_unloading() || is_unloaded()); 1167 } 1168 1169 void nmethod::inc_decompile_count() { 1170 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1171 // Could be gated by ProfileTraps, but do not bother... 1172 Method* m = method(); 1173 if (m == NULL) return; 1174 MethodData* mdo = m->method_data(); 1175 if (mdo == NULL) return; 1176 // There is a benign race here. See comments in methodData.hpp. 1177 mdo->inc_decompile_count(); 1178 } 1179 1180 bool nmethod::try_transition(int new_state_int) { 1181 signed char new_state = new_state_int; 1182 #ifdef ASSERT 1183 if (new_state != unloaded) { 1184 assert_lock_strong(CompiledMethod_lock); 1185 } 1186 #endif 1187 for (;;) { 1188 signed char old_state = Atomic::load(&_state); 1189 if (old_state >= new_state) { 1190 // Ensure monotonicity of transitions. 1191 return false; 1192 } 1193 if (Atomic::cmpxchg(&_state, old_state, new_state) == old_state) { 1194 return true; 1195 } 1196 } 1197 } 1198 1199 void nmethod::make_unloaded() { 1200 post_compiled_method_unload(); 1201 1202 // This nmethod is being unloaded, make sure that dependencies 1203 // recorded in instanceKlasses get flushed. 1204 // Since this work is being done during a GC, defer deleting dependencies from the 1205 // InstanceKlass. 1206 assert(Universe::heap()->is_gc_active() || 1207 Thread::current()->is_ConcurrentGC_thread() || 1208 Thread::current()->is_Worker_thread(), 1209 "should only be called during gc"); 1210 flush_dependencies(/*delete_immediately*/false); 1211 1212 // Break cycle between nmethod & method 1213 LogTarget(Trace, class, unload, nmethod) lt; 1214 if (lt.is_enabled()) { 1215 LogStream ls(lt); 1216 ls.print("making nmethod " INTPTR_FORMAT 1217 " unloadable, Method*(" INTPTR_FORMAT 1218 ") ", 1219 p2i(this), p2i(_method)); 1220 ls.cr(); 1221 } 1222 // Unlink the osr method, so we do not look this up again 1223 if (is_osr_method()) { 1224 // Invalidate the osr nmethod only once. Note that with concurrent 1225 // code cache unloading, OSR nmethods are invalidated before they 1226 // are made unloaded. Therefore, this becomes a no-op then. 1227 if (is_in_use()) { 1228 invalidate_osr_method(); 1229 } 1230 #ifdef ASSERT 1231 if (method() != NULL) { 1232 // Make sure osr nmethod is invalidated, i.e. not on the list 1233 bool found = method()->method_holder()->remove_osr_nmethod(this); 1234 assert(!found, "osr nmethod should have been invalidated"); 1235 } 1236 #endif 1237 } 1238 1239 // If _method is already NULL the Method* is about to be unloaded, 1240 // so we don't have to break the cycle. Note that it is possible to 1241 // have the Method* live here, in case we unload the nmethod because 1242 // it is pointing to some oop (other than the Method*) being unloaded. 1243 if (_method != NULL) { 1244 _method->unlink_code(this); 1245 } 1246 1247 // Make the class unloaded - i.e., change state and notify sweeper 1248 assert(SafepointSynchronize::is_at_safepoint() || 1249 Thread::current()->is_ConcurrentGC_thread() || 1250 Thread::current()->is_Worker_thread(), 1251 "must be at safepoint"); 1252 1253 { 1254 // Clear ICStubs and release any CompiledICHolders. 1255 CompiledICLocker ml(this); 1256 clear_ic_callsites(); 1257 } 1258 1259 // Unregister must be done before the state change 1260 { 1261 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock, 1262 Mutex::_no_safepoint_check_flag); 1263 Universe::heap()->unregister_nmethod(this); 1264 } 1265 1266 // Clear the method of this dead nmethod 1267 set_method(NULL); 1268 1269 // Log the unloading. 1270 log_state_change(); 1271 1272 // The Method* is gone at this point 1273 assert(_method == NULL, "Tautology"); 1274 1275 set_osr_link(NULL); 1276 NMethodSweeper::report_state_change(this); 1277 1278 bool transition_success = try_transition(unloaded); 1279 1280 // It is an important invariant that there exists no race between 1281 // the sweeper and GC thread competing for making the same nmethod 1282 // zombie and unloaded respectively. This is ensured by 1283 // can_convert_to_zombie() returning false for any is_unloading() 1284 // nmethod, informing the sweeper not to step on any GC toes. 1285 assert(transition_success, "Invalid nmethod transition to unloaded"); 1286 1287 #if INCLUDE_JVMCI 1288 // Clear the link between this nmethod and a HotSpotNmethod mirror 1289 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1290 if (nmethod_data != NULL) { 1291 nmethod_data->invalidate_nmethod_mirror(this); 1292 } 1293 #endif 1294 } 1295 1296 void nmethod::invalidate_osr_method() { 1297 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1298 // Remove from list of active nmethods 1299 if (method() != NULL) { 1300 method()->method_holder()->remove_osr_nmethod(this); 1301 } 1302 } 1303 1304 void nmethod::log_state_change() const { 1305 if (LogCompilation) { 1306 if (xtty != NULL) { 1307 ttyLocker ttyl; // keep the following output all in one block 1308 if (_state == unloaded) { 1309 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1310 os::current_thread_id()); 1311 } else { 1312 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1313 os::current_thread_id(), 1314 (_state == zombie ? " zombie='1'" : "")); 1315 } 1316 log_identity(xtty); 1317 xtty->stamp(); 1318 xtty->end_elem(); 1319 } 1320 } 1321 1322 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1323 CompileTask::print_ul(this, state_msg); 1324 if (PrintCompilation && _state != unloaded) { 1325 print_on(tty, state_msg); 1326 } 1327 } 1328 1329 void nmethod::unlink_from_method() { 1330 if (method() != NULL) { 1331 method()->unlink_code(this); 1332 } 1333 } 1334 1335 /** 1336 * Common functionality for both make_not_entrant and make_zombie 1337 */ 1338 bool nmethod::make_not_entrant_or_zombie(int state) { 1339 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1340 1341 if (Atomic::load(&_state) >= state) { 1342 // Avoid taking the lock if already in required state. 1343 // This is safe from races because the state is an end-state, 1344 // which the nmethod cannot back out of once entered. 1345 // No need for fencing either. 1346 return false; 1347 } 1348 1349 // Make sure the nmethod is not flushed. 1350 nmethodLocker nml(this); 1351 // This can be called while the system is already at a safepoint which is ok 1352 NoSafepointVerifier nsv; 1353 1354 // during patching, depending on the nmethod state we must notify the GC that 1355 // code has been unloaded, unregistering it. We cannot do this right while 1356 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This 1357 // would be prone to deadlocks. 1358 // This flag is used to remember whether we need to later lock and unregister. 1359 bool nmethod_needs_unregister = false; 1360 1361 { 1362 // Enter critical section. Does not block for safepoint. 1363 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1364 1365 // This logic is equivalent to the logic below for patching the 1366 // verified entry point of regular methods. We check that the 1367 // nmethod is in use to ensure that it is invalidated only once. 1368 if (is_osr_method() && is_in_use()) { 1369 // this effectively makes the osr nmethod not entrant 1370 invalidate_osr_method(); 1371 } 1372 1373 if (Atomic::load(&_state) >= state) { 1374 // another thread already performed this transition so nothing 1375 // to do, but return false to indicate this. 1376 return false; 1377 } 1378 1379 // The caller can be calling the method statically or through an inline 1380 // cache call. 1381 if (!is_osr_method() && !is_not_entrant()) { 1382 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1383 SharedRuntime::get_handle_wrong_method_stub()); 1384 } 1385 1386 if (is_in_use() && update_recompile_counts()) { 1387 // It's a true state change, so mark the method as decompiled. 1388 // Do it only for transition from alive. 1389 inc_decompile_count(); 1390 } 1391 1392 // If the state is becoming a zombie, signal to unregister the nmethod with 1393 // the heap. 1394 // This nmethod may have already been unloaded during a full GC. 1395 if ((state == zombie) && !is_unloaded()) { 1396 nmethod_needs_unregister = true; 1397 } 1398 1399 // Must happen before state change. Otherwise we have a race condition in 1400 // nmethod::can_convert_to_zombie(). I.e., a method can immediately 1401 // transition its state from 'not_entrant' to 'zombie' without having to wait 1402 // for stack scanning. 1403 if (state == not_entrant) { 1404 mark_as_seen_on_stack(); 1405 OrderAccess::storestore(); // _stack_traversal_mark and _state 1406 } 1407 1408 // Change state 1409 if (!try_transition(state)) { 1410 // If the transition fails, it is due to another thread making the nmethod more 1411 // dead. In particular, one thread might be making the nmethod unloaded concurrently. 1412 // If so, having patched in the jump in the verified entry unnecessarily is fine. 1413 // The nmethod is no longer possible to call by Java threads. 1414 // Incrementing the decompile count is also fine as the caller of make_not_entrant() 1415 // had a valid reason to deoptimize the nmethod. 1416 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now 1417 // !is_alive(), and the seen on stack value is only used to convert not_entrant 1418 // nmethods to zombie in can_convert_to_zombie(). 1419 return false; 1420 } 1421 1422 // Log the transition once 1423 log_state_change(); 1424 1425 // Remove nmethod from method. 1426 unlink_from_method(); 1427 1428 } // leave critical region under CompiledMethod_lock 1429 1430 #if INCLUDE_JVMCI 1431 // Invalidate can't occur while holding the Patching lock 1432 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1433 if (nmethod_data != NULL) { 1434 nmethod_data->invalidate_nmethod_mirror(this); 1435 } 1436 #endif 1437 1438 #ifdef ASSERT 1439 if (is_osr_method() && method() != NULL) { 1440 // Make sure osr nmethod is invalidated, i.e. not on the list 1441 bool found = method()->method_holder()->remove_osr_nmethod(this); 1442 assert(!found, "osr nmethod should have been invalidated"); 1443 } 1444 #endif 1445 1446 // When the nmethod becomes zombie it is no longer alive so the 1447 // dependencies must be flushed. nmethods in the not_entrant 1448 // state will be flushed later when the transition to zombie 1449 // happens or they get unloaded. 1450 if (state == zombie) { 1451 { 1452 // Flushing dependencies must be done before any possible 1453 // safepoint can sneak in, otherwise the oops used by the 1454 // dependency logic could have become stale. 1455 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1456 if (nmethod_needs_unregister) { 1457 Universe::heap()->unregister_nmethod(this); 1458 } 1459 flush_dependencies(/*delete_immediately*/true); 1460 } 1461 1462 #if INCLUDE_JVMCI 1463 // Now that the nmethod has been unregistered, it's 1464 // safe to clear the HotSpotNmethod mirror oop. 1465 if (nmethod_data != NULL) { 1466 nmethod_data->clear_nmethod_mirror(this); 1467 } 1468 #endif 1469 1470 // Clear ICStubs to prevent back patching stubs of zombie or flushed 1471 // nmethods during the next safepoint (see ICStub::finalize), as well 1472 // as to free up CompiledICHolder resources. 1473 { 1474 CompiledICLocker ml(this); 1475 clear_ic_callsites(); 1476 } 1477 1478 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1479 // event and it hasn't already been reported for this nmethod then 1480 // report it now. The event may have been reported earlier if the GC 1481 // marked it for unloading). JvmtiDeferredEventQueue support means 1482 // we no longer go to a safepoint here. 1483 post_compiled_method_unload(); 1484 1485 #ifdef ASSERT 1486 // It's no longer safe to access the oops section since zombie 1487 // nmethods aren't scanned for GC. 1488 _oops_are_stale = true; 1489 #endif 1490 // the Method may be reclaimed by class unloading now that the 1491 // nmethod is in zombie state 1492 set_method(NULL); 1493 } else { 1494 assert(state == not_entrant, "other cases may need to be handled differently"); 1495 } 1496 1497 if (TraceCreateZombies && state == zombie) { 1498 ResourceMark m; 1499 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); 1500 } 1501 1502 NMethodSweeper::report_state_change(this); 1503 return true; 1504 } 1505 1506 void nmethod::flush() { 1507 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1508 // Note that there are no valid oops in the nmethod anymore. 1509 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1510 "osr nmethod must be unloaded or zombie before flushing"); 1511 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1512 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1513 assert_locked_or_safepoint(CodeCache_lock); 1514 1515 // completely deallocate this method 1516 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1517 if (PrintMethodFlushing) { 1518 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1519 "/Free CodeCache:" SIZE_FORMAT "Kb", 1520 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1521 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1522 } 1523 1524 // We need to deallocate any ExceptionCache data. 1525 // Note that we do not need to grab the nmethod lock for this, it 1526 // better be thread safe if we're disposing of it! 1527 ExceptionCache* ec = exception_cache(); 1528 set_exception_cache(NULL); 1529 while(ec != NULL) { 1530 ExceptionCache* next = ec->next(); 1531 delete ec; 1532 ec = next; 1533 } 1534 1535 Universe::heap()->flush_nmethod(this); 1536 CodeCache::unregister_old_nmethod(this); 1537 1538 CodeBlob::flush(); 1539 CodeCache::free(this); 1540 } 1541 1542 oop nmethod::oop_at(int index) const { 1543 if (index == 0) { 1544 return NULL; 1545 } 1546 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1547 } 1548 1549 oop nmethod::oop_at_phantom(int index) const { 1550 if (index == 0) { 1551 return NULL; 1552 } 1553 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); 1554 } 1555 1556 // 1557 // Notify all classes this nmethod is dependent on that it is no 1558 // longer dependent. This should only be called in two situations. 1559 // First, when a nmethod transitions to a zombie all dependents need 1560 // to be clear. Since zombification happens at a safepoint there's no 1561 // synchronization issues. The second place is a little more tricky. 1562 // During phase 1 of mark sweep class unloading may happen and as a 1563 // result some nmethods may get unloaded. In this case the flushing 1564 // of dependencies must happen during phase 1 since after GC any 1565 // dependencies in the unloaded nmethod won't be updated, so 1566 // traversing the dependency information in unsafe. In that case this 1567 // function is called with a boolean argument and this function only 1568 // notifies instanceKlasses that are reachable 1569 1570 void nmethod::flush_dependencies(bool delete_immediately) { 1571 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || 1572 Thread::current()->is_ConcurrentGC_thread() || 1573 Thread::current()->is_Worker_thread();) 1574 assert(called_by_gc != delete_immediately, 1575 "delete_immediately is false if and only if we are called during GC"); 1576 if (!has_flushed_dependencies()) { 1577 set_has_flushed_dependencies(); 1578 for (Dependencies::DepStream deps(this); deps.next(); ) { 1579 if (deps.type() == Dependencies::call_site_target_value) { 1580 // CallSite dependencies are managed on per-CallSite instance basis. 1581 oop call_site = deps.argument_oop(0); 1582 if (delete_immediately) { 1583 assert_locked_or_safepoint(CodeCache_lock); 1584 MethodHandles::remove_dependent_nmethod(call_site, this); 1585 } else { 1586 MethodHandles::clean_dependency_context(call_site); 1587 } 1588 } else { 1589 Klass* klass = deps.context_type(); 1590 if (klass == NULL) { 1591 continue; // ignore things like evol_method 1592 } 1593 // During GC delete_immediately is false, and liveness 1594 // of dependee determines class that needs to be updated. 1595 if (delete_immediately) { 1596 assert_locked_or_safepoint(CodeCache_lock); 1597 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1598 } else if (klass->is_loader_alive()) { 1599 // The GC may clean dependency contexts concurrently and in parallel. 1600 InstanceKlass::cast(klass)->clean_dependency_context(); 1601 } 1602 } 1603 } 1604 } 1605 } 1606 1607 // ------------------------------------------------------------------ 1608 // post_compiled_method_load_event 1609 // new method for install_code() path 1610 // Transfer information from compilation to jvmti 1611 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) { 1612 1613 // Don't post this nmethod load event if it is already dying 1614 // because the sweeper might already be deleting this nmethod. 1615 { 1616 MutexLocker ml(CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1617 // When the nmethod is acquired from the CodeCache iterator, it can racingly become zombie 1618 // before this code is called. Filter them out here under the CompiledMethod_lock. 1619 if (!is_alive()) { 1620 return; 1621 } 1622 // As for is_alive() nmethods, we also don't want them to racingly become zombie once we 1623 // release this lock, so we check that this is not going to be the case. 1624 if (is_not_entrant() && can_convert_to_zombie()) { 1625 return; 1626 } 1627 // Ensure the sweeper can't collect this nmethod until it become "active" with JvmtiThreadState::nmethods_do. 1628 mark_as_seen_on_stack(); 1629 } 1630 1631 // This is a bad time for a safepoint. We don't want 1632 // this nmethod to get unloaded while we're queueing the event. 1633 NoSafepointVerifier nsv; 1634 1635 Method* m = method(); 1636 HOTSPOT_COMPILED_METHOD_LOAD( 1637 (char *) m->klass_name()->bytes(), 1638 m->klass_name()->utf8_length(), 1639 (char *) m->name()->bytes(), 1640 m->name()->utf8_length(), 1641 (char *) m->signature()->bytes(), 1642 m->signature()->utf8_length(), 1643 insts_begin(), insts_size()); 1644 1645 1646 if (JvmtiExport::should_post_compiled_method_load()) { 1647 // Only post unload events if load events are found. 1648 set_load_reported(); 1649 // If a JavaThread hasn't been passed in, let the Service thread 1650 // (which is a real Java thread) post the event 1651 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this); 1652 if (state == NULL) { 1653 // Execute any barrier code for this nmethod as if it's called, since 1654 // keeping it alive looks like stack walking. 1655 run_nmethod_entry_barrier(); 1656 ServiceThread::enqueue_deferred_event(&event); 1657 } else { 1658 // This enters the nmethod barrier outside in the caller. 1659 state->enqueue_event(&event); 1660 } 1661 } 1662 } 1663 1664 void nmethod::post_compiled_method_unload() { 1665 if (unload_reported()) { 1666 // During unloading we transition to unloaded and then to zombie 1667 // and the unloading is reported during the first transition. 1668 return; 1669 } 1670 1671 assert(_method != NULL && !is_unloaded(), "just checking"); 1672 DTRACE_METHOD_UNLOAD_PROBE(method()); 1673 1674 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1675 // post the event. Sometime later this nmethod will be made a zombie 1676 // by the sweeper but the Method* will not be valid at that point. 1677 // The jmethodID is a weak reference to the Method* so if 1678 // it's being unloaded there's no way to look it up since the weak 1679 // ref will have been cleared. 1680 1681 // Don't bother posting the unload if the load event wasn't posted. 1682 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) { 1683 assert(!unload_reported(), "already unloaded"); 1684 JvmtiDeferredEvent event = 1685 JvmtiDeferredEvent::compiled_method_unload_event( 1686 method()->jmethod_id(), insts_begin()); 1687 ServiceThread::enqueue_deferred_event(&event); 1688 } 1689 1690 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1691 // any time. As the nmethod is being unloaded now we mark it has 1692 // having the unload event reported - this will ensure that we don't 1693 // attempt to report the event in the unlikely scenario where the 1694 // event is enabled at the time the nmethod is made a zombie. 1695 set_unload_reported(); 1696 } 1697 1698 // Iterate over metadata calling this function. Used by RedefineClasses 1699 void nmethod::metadata_do(MetadataClosure* f) { 1700 { 1701 // Visit all immediate references that are embedded in the instruction stream. 1702 RelocIterator iter(this, oops_reloc_begin()); 1703 while (iter.next()) { 1704 if (iter.type() == relocInfo::metadata_type) { 1705 metadata_Relocation* r = iter.metadata_reloc(); 1706 // In this metadata, we must only follow those metadatas directly embedded in 1707 // the code. Other metadatas (oop_index>0) are seen as part of 1708 // the metadata section below. 1709 assert(1 == (r->metadata_is_immediate()) + 1710 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1711 "metadata must be found in exactly one place"); 1712 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1713 Metadata* md = r->metadata_value(); 1714 if (md != _method) f->do_metadata(md); 1715 } 1716 } else if (iter.type() == relocInfo::virtual_call_type) { 1717 // Check compiledIC holders associated with this nmethod 1718 ResourceMark rm; 1719 CompiledIC *ic = CompiledIC_at(&iter); 1720 if (ic->is_icholder_call()) { 1721 CompiledICHolder* cichk = ic->cached_icholder(); 1722 f->do_metadata(cichk->holder_metadata()); 1723 f->do_metadata(cichk->holder_klass()); 1724 } else { 1725 Metadata* ic_oop = ic->cached_metadata(); 1726 if (ic_oop != NULL) { 1727 f->do_metadata(ic_oop); 1728 } 1729 } 1730 } 1731 } 1732 } 1733 1734 // Visit the metadata section 1735 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1736 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1737 Metadata* md = *p; 1738 f->do_metadata(md); 1739 } 1740 1741 // Visit metadata not embedded in the other places. 1742 if (_method != NULL) f->do_metadata(_method); 1743 } 1744 1745 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1746 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle. 1747 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1748 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1749 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1750 1751 class IsUnloadingState: public AllStatic { 1752 static const uint8_t _is_unloading_mask = 1; 1753 static const uint8_t _is_unloading_shift = 0; 1754 static const uint8_t _unloading_cycle_mask = 6; 1755 static const uint8_t _unloading_cycle_shift = 1; 1756 1757 static uint8_t set_is_unloading(uint8_t state, bool value) { 1758 state &= ~_is_unloading_mask; 1759 if (value) { 1760 state |= 1 << _is_unloading_shift; 1761 } 1762 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1763 return state; 1764 } 1765 1766 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1767 state &= ~_unloading_cycle_mask; 1768 state |= value << _unloading_cycle_shift; 1769 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1770 return state; 1771 } 1772 1773 public: 1774 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1775 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1776 1777 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1778 uint8_t state = 0; 1779 state = set_is_unloading(state, is_unloading); 1780 state = set_unloading_cycle(state, unloading_cycle); 1781 return state; 1782 } 1783 }; 1784 1785 bool nmethod::is_unloading() { 1786 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1787 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1788 if (state_is_unloading) { 1789 return true; 1790 } 1791 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1792 uint8_t current_cycle = CodeCache::unloading_cycle(); 1793 if (state_unloading_cycle == current_cycle) { 1794 return false; 1795 } 1796 1797 // The IsUnloadingBehaviour is responsible for checking if there are any dead 1798 // oops in the CompiledMethod, by calling oops_do on it. 1799 state_unloading_cycle = current_cycle; 1800 1801 if (is_zombie()) { 1802 // Zombies without calculated unloading epoch are never unloading due to GC. 1803 1804 // There are no races where a previously observed is_unloading() nmethod 1805 // suddenly becomes not is_unloading() due to here being observed as zombie. 1806 1807 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked 1808 // and unloaded in the safepoint. That makes races where an nmethod is first 1809 // observed as is_alive() && is_unloading() and subsequently observed as 1810 // is_zombie() impossible. 1811 1812 // With concurrent unloading, all references to is_unloading() nmethods are 1813 // first unlinked (e.g. IC caches and dependency contexts). Then a global 1814 // handshake operation is performed with all JavaThreads before finally 1815 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading() 1816 // nmethods to zombies; it waits for them to become is_unloaded(). So before 1817 // the global handshake, it is impossible for is_unloading() nmethods to 1818 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive() 1819 // nmethods before taking that global handshake, meaning that it will never 1820 // be recalculated after the handshake. 1821 1822 // After that global handshake, is_unloading() nmethods are only observable 1823 // to the iterators, and they will never trigger recomputation of the cached 1824 // is_unloading_state, and hence may not suffer from such races. 1825 1826 state_is_unloading = false; 1827 } else { 1828 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this); 1829 } 1830 1831 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1832 1833 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1834 1835 return state_is_unloading; 1836 } 1837 1838 void nmethod::clear_unloading_state() { 1839 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1840 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1841 } 1842 1843 1844 // This is called at the end of the strong tracing/marking phase of a 1845 // GC to unload an nmethod if it contains otherwise unreachable 1846 // oops. 1847 1848 void nmethod::do_unloading(bool unloading_occurred) { 1849 // Make sure the oop's ready to receive visitors 1850 assert(!is_zombie() && !is_unloaded(), 1851 "should not call follow on zombie or unloaded nmethod"); 1852 1853 if (is_unloading()) { 1854 make_unloaded(); 1855 } else { 1856 guarantee(unload_nmethod_caches(unloading_occurred), 1857 "Should not need transition stubs"); 1858 } 1859 } 1860 1861 void nmethod::oops_do(OopClosure* f, bool allow_dead) { 1862 // make sure the oops ready to receive visitors 1863 assert(allow_dead || is_alive(), "should not call follow on dead nmethod"); 1864 1865 // Prevent extra code cache walk for platforms that don't have immediate oops. 1866 if (relocInfo::mustIterateImmediateOopsInCode()) { 1867 RelocIterator iter(this, oops_reloc_begin()); 1868 1869 while (iter.next()) { 1870 if (iter.type() == relocInfo::oop_type ) { 1871 oop_Relocation* r = iter.oop_reloc(); 1872 // In this loop, we must only follow those oops directly embedded in 1873 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1874 assert(1 == (r->oop_is_immediate()) + 1875 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1876 "oop must be found in exactly one place"); 1877 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1878 f->do_oop(r->oop_addr()); 1879 } 1880 } 1881 } 1882 } 1883 1884 // Scopes 1885 // This includes oop constants not inlined in the code stream. 1886 for (oop* p = oops_begin(); p < oops_end(); p++) { 1887 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1888 f->do_oop(p); 1889 } 1890 } 1891 1892 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1893 1894 void nmethod::oops_do_log_change(const char* state) { 1895 LogTarget(Trace, gc, nmethod) lt; 1896 if (lt.is_enabled()) { 1897 LogStream ls(lt); 1898 CompileTask::print(&ls, this, state, true /* short_form */); 1899 } 1900 } 1901 1902 bool nmethod::oops_do_try_claim() { 1903 if (oops_do_try_claim_weak_request()) { 1904 nmethod* result = oops_do_try_add_to_list_as_weak_done(); 1905 assert(result == NULL, "adding to global list as weak done must always succeed."); 1906 return true; 1907 } 1908 return false; 1909 } 1910 1911 bool nmethod::oops_do_try_claim_weak_request() { 1912 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1913 1914 if ((_oops_do_mark_link == NULL) && 1915 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) { 1916 oops_do_log_change("oops_do, mark weak request"); 1917 return true; 1918 } 1919 return false; 1920 } 1921 1922 void nmethod::oops_do_set_strong_done(nmethod* old_head) { 1923 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag); 1924 } 1925 1926 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() { 1927 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1928 1929 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)); 1930 if (old_next == NULL) { 1931 oops_do_log_change("oops_do, mark strong done"); 1932 } 1933 return old_next; 1934 } 1935 1936 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) { 1937 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1938 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak"); 1939 1940 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag)); 1941 if (old_next == next) { 1942 oops_do_log_change("oops_do, mark strong request"); 1943 } 1944 return old_next; 1945 } 1946 1947 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) { 1948 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1949 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done"); 1950 1951 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag)); 1952 if (old_next == next) { 1953 oops_do_log_change("oops_do, mark weak done -> mark strong done"); 1954 return true; 1955 } 1956 return false; 1957 } 1958 1959 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() { 1960 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1961 1962 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag || 1963 extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1964 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1965 1966 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1967 // Self-loop if needed. 1968 if (old_head == NULL) { 1969 old_head = this; 1970 } 1971 // Try to install end of list and weak done tag. 1972 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)) { 1973 oops_do_log_change("oops_do, mark weak done"); 1974 return NULL; 1975 } else { 1976 return old_head; 1977 } 1978 } 1979 1980 void nmethod::oops_do_add_to_list_as_strong_done() { 1981 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1982 1983 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1984 // Self-loop if needed. 1985 if (old_head == NULL) { 1986 old_head = this; 1987 } 1988 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u", 1989 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1990 1991 oops_do_set_strong_done(old_head); 1992 } 1993 1994 void nmethod::oops_do_process_weak(OopsDoProcessor* p) { 1995 if (!oops_do_try_claim_weak_request()) { 1996 // Failed to claim for weak processing. 1997 oops_do_log_change("oops_do, mark weak request fail"); 1998 return; 1999 } 2000 2001 p->do_regular_processing(this); 2002 2003 nmethod* old_head = oops_do_try_add_to_list_as_weak_done(); 2004 if (old_head == NULL) { 2005 return; 2006 } 2007 oops_do_log_change("oops_do, mark weak done fail"); 2008 // Adding to global list failed, another thread added a strong request. 2009 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag, 2010 "must be but is %u", extract_state(_oops_do_mark_link)); 2011 2012 oops_do_log_change("oops_do, mark weak request -> mark strong done"); 2013 2014 oops_do_set_strong_done(old_head); 2015 // Do missing strong processing. 2016 p->do_remaining_strong_processing(this); 2017 } 2018 2019 void nmethod::oops_do_process_strong(OopsDoProcessor* p) { 2020 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done(); 2021 if (next_raw == NULL) { 2022 p->do_regular_processing(this); 2023 oops_do_add_to_list_as_strong_done(); 2024 return; 2025 } 2026 // Claim failed. Figure out why and handle it. 2027 if (oops_do_has_weak_request(next_raw)) { 2028 oops_do_mark_link* old = next_raw; 2029 // Claim failed because being weak processed (state == "weak request"). 2030 // Try to request deferred strong processing. 2031 next_raw = oops_do_try_add_strong_request(old); 2032 if (next_raw == old) { 2033 // Successfully requested deferred strong processing. 2034 return; 2035 } 2036 // Failed because of a concurrent transition. No longer in "weak request" state. 2037 } 2038 if (oops_do_has_any_strong_state(next_raw)) { 2039 // Already claimed for strong processing or requested for such. 2040 return; 2041 } 2042 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) { 2043 // Successfully claimed "weak done" as "strong done". Do the missing marking. 2044 p->do_remaining_strong_processing(this); 2045 return; 2046 } 2047 // Claim failed, some other thread got it. 2048 } 2049 2050 void nmethod::oops_do_marking_prologue() { 2051 assert_at_safepoint(); 2052 2053 log_trace(gc, nmethod)("oops_do_marking_prologue"); 2054 assert(_oops_do_mark_nmethods == NULL, "must be empty"); 2055 } 2056 2057 void nmethod::oops_do_marking_epilogue() { 2058 assert_at_safepoint(); 2059 2060 nmethod* next = _oops_do_mark_nmethods; 2061 _oops_do_mark_nmethods = NULL; 2062 if (next != NULL) { 2063 nmethod* cur; 2064 do { 2065 cur = next; 2066 next = extract_nmethod(cur->_oops_do_mark_link); 2067 cur->_oops_do_mark_link = NULL; 2068 DEBUG_ONLY(cur->verify_oop_relocations()); 2069 2070 LogTarget(Trace, gc, nmethod) lt; 2071 if (lt.is_enabled()) { 2072 LogStream ls(lt); 2073 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 2074 } 2075 // End if self-loop has been detected. 2076 } while (cur != next); 2077 } 2078 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 2079 } 2080 2081 inline bool includes(void* p, void* from, void* to) { 2082 return from <= p && p < to; 2083 } 2084 2085 2086 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2087 assert(count >= 2, "must be sentinel values, at least"); 2088 2089 #ifdef ASSERT 2090 // must be sorted and unique; we do a binary search in find_pc_desc() 2091 int prev_offset = pcs[0].pc_offset(); 2092 assert(prev_offset == PcDesc::lower_offset_limit, 2093 "must start with a sentinel"); 2094 for (int i = 1; i < count; i++) { 2095 int this_offset = pcs[i].pc_offset(); 2096 assert(this_offset > prev_offset, "offsets must be sorted"); 2097 prev_offset = this_offset; 2098 } 2099 assert(prev_offset == PcDesc::upper_offset_limit, 2100 "must end with a sentinel"); 2101 #endif //ASSERT 2102 2103 // Search for MethodHandle invokes and tag the nmethod. 2104 for (int i = 0; i < count; i++) { 2105 if (pcs[i].is_method_handle_invoke()) { 2106 set_has_method_handle_invokes(true); 2107 break; 2108 } 2109 } 2110 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 2111 2112 int size = count * sizeof(PcDesc); 2113 assert(scopes_pcs_size() >= size, "oob"); 2114 memcpy(scopes_pcs_begin(), pcs, size); 2115 2116 // Adjust the final sentinel downward. 2117 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2118 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2119 last_pc->set_pc_offset(content_size() + 1); 2120 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2121 // Fill any rounding gaps with copies of the last record. 2122 last_pc[1] = last_pc[0]; 2123 } 2124 // The following assert could fail if sizeof(PcDesc) is not 2125 // an integral multiple of oopSize (the rounding term). 2126 // If it fails, change the logic to always allocate a multiple 2127 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2128 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2129 } 2130 2131 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2132 assert(scopes_data_size() >= size, "oob"); 2133 memcpy(scopes_data_begin(), buffer, size); 2134 } 2135 2136 #ifdef ASSERT 2137 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 2138 PcDesc* lower = search.scopes_pcs_begin(); 2139 PcDesc* upper = search.scopes_pcs_end(); 2140 lower += 1; // exclude initial sentinel 2141 PcDesc* res = NULL; 2142 for (PcDesc* p = lower; p < upper; p++) { 2143 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2144 if (match_desc(p, pc_offset, approximate)) { 2145 if (res == NULL) 2146 res = p; 2147 else 2148 res = (PcDesc*) badAddress; 2149 } 2150 } 2151 return res; 2152 } 2153 #endif 2154 2155 2156 // Finds a PcDesc with real-pc equal to "pc" 2157 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 2158 address base_address = search.code_begin(); 2159 if ((pc < base_address) || 2160 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2161 return NULL; // PC is wildly out of range 2162 } 2163 int pc_offset = (int) (pc - base_address); 2164 2165 // Check the PcDesc cache if it contains the desired PcDesc 2166 // (This as an almost 100% hit rate.) 2167 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2168 if (res != NULL) { 2169 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 2170 return res; 2171 } 2172 2173 // Fallback algorithm: quasi-linear search for the PcDesc 2174 // Find the last pc_offset less than the given offset. 2175 // The successor must be the required match, if there is a match at all. 2176 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2177 PcDesc* lower = search.scopes_pcs_begin(); 2178 PcDesc* upper = search.scopes_pcs_end(); 2179 upper -= 1; // exclude final sentinel 2180 if (lower >= upper) return NULL; // native method; no PcDescs at all 2181 2182 #define assert_LU_OK \ 2183 /* invariant on lower..upper during the following search: */ \ 2184 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2185 assert(upper->pc_offset() >= pc_offset, "sanity") 2186 assert_LU_OK; 2187 2188 // Use the last successful return as a split point. 2189 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2190 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2191 if (mid->pc_offset() < pc_offset) { 2192 lower = mid; 2193 } else { 2194 upper = mid; 2195 } 2196 2197 // Take giant steps at first (4096, then 256, then 16, then 1) 2198 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2199 const int RADIX = (1 << LOG2_RADIX); 2200 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2201 while ((mid = lower + step) < upper) { 2202 assert_LU_OK; 2203 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2204 if (mid->pc_offset() < pc_offset) { 2205 lower = mid; 2206 } else { 2207 upper = mid; 2208 break; 2209 } 2210 } 2211 assert_LU_OK; 2212 } 2213 2214 // Sneak up on the value with a linear search of length ~16. 2215 while (true) { 2216 assert_LU_OK; 2217 mid = lower + 1; 2218 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2219 if (mid->pc_offset() < pc_offset) { 2220 lower = mid; 2221 } else { 2222 upper = mid; 2223 break; 2224 } 2225 } 2226 #undef assert_LU_OK 2227 2228 if (match_desc(upper, pc_offset, approximate)) { 2229 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 2230 _pc_desc_cache.add_pc_desc(upper); 2231 return upper; 2232 } else { 2233 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 2234 return NULL; 2235 } 2236 } 2237 2238 2239 void nmethod::check_all_dependencies(DepChange& changes) { 2240 // Checked dependencies are allocated into this ResourceMark 2241 ResourceMark rm; 2242 2243 // Turn off dependency tracing while actually testing dependencies. 2244 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2245 2246 typedef ResourceHashtable<DependencySignature, int, 11027, 2247 ResourceObj::RESOURCE_AREA, mtInternal, 2248 &DependencySignature::hash, 2249 &DependencySignature::equals> DepTable; 2250 2251 DepTable* table = new DepTable(); 2252 2253 // Iterate over live nmethods and check dependencies of all nmethods that are not 2254 // marked for deoptimization. A particular dependency is only checked once. 2255 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading); 2256 while(iter.next()) { 2257 nmethod* nm = iter.method(); 2258 // Only notify for live nmethods 2259 if (!nm->is_marked_for_deoptimization()) { 2260 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2261 // Construct abstraction of a dependency. 2262 DependencySignature* current_sig = new DependencySignature(deps); 2263 2264 // Determine if dependency is already checked. table->put(...) returns 2265 // 'true' if the dependency is added (i.e., was not in the hashtable). 2266 if (table->put(*current_sig, 1)) { 2267 if (deps.check_dependency() != NULL) { 2268 // Dependency checking failed. Print out information about the failed 2269 // dependency and finally fail with an assert. We can fail here, since 2270 // dependency checking is never done in a product build. 2271 tty->print_cr("Failed dependency:"); 2272 changes.print(); 2273 nm->print(); 2274 nm->print_dependencies(); 2275 assert(false, "Should have been marked for deoptimization"); 2276 } 2277 } 2278 } 2279 } 2280 } 2281 } 2282 2283 bool nmethod::check_dependency_on(DepChange& changes) { 2284 // What has happened: 2285 // 1) a new class dependee has been added 2286 // 2) dependee and all its super classes have been marked 2287 bool found_check = false; // set true if we are upset 2288 for (Dependencies::DepStream deps(this); deps.next(); ) { 2289 // Evaluate only relevant dependencies. 2290 if (deps.spot_check_dependency_at(changes) != NULL) { 2291 found_check = true; 2292 NOT_DEBUG(break); 2293 } 2294 } 2295 return found_check; 2296 } 2297 2298 // Called from mark_for_deoptimization, when dependee is invalidated. 2299 bool nmethod::is_dependent_on_method(Method* dependee) { 2300 for (Dependencies::DepStream deps(this); deps.next(); ) { 2301 if (deps.type() != Dependencies::evol_method) 2302 continue; 2303 Method* method = deps.method_argument(0); 2304 if (method == dependee) return true; 2305 } 2306 return false; 2307 } 2308 2309 2310 bool nmethod::is_patchable_at(address instr_addr) { 2311 assert(insts_contains(instr_addr), "wrong nmethod used"); 2312 if (is_zombie()) { 2313 // a zombie may never be patched 2314 return false; 2315 } 2316 return true; 2317 } 2318 2319 2320 void nmethod_init() { 2321 // make sure you didn't forget to adjust the filler fields 2322 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2323 } 2324 2325 2326 //------------------------------------------------------------------------------------------- 2327 2328 2329 // QQQ might we make this work from a frame?? 2330 nmethodLocker::nmethodLocker(address pc) { 2331 CodeBlob* cb = CodeCache::find_blob(pc); 2332 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2333 _nm = cb->as_compiled_method(); 2334 lock_nmethod(_nm); 2335 } 2336 2337 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2338 // should pass zombie_ok == true. 2339 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2340 if (cm == NULL) return; 2341 nmethod* nm = cm->as_nmethod(); 2342 Atomic::inc(&nm->_lock_count); 2343 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm); 2344 } 2345 2346 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2347 if (cm == NULL) return; 2348 nmethod* nm = cm->as_nmethod(); 2349 Atomic::dec(&nm->_lock_count); 2350 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2351 } 2352 2353 2354 // ----------------------------------------------------------------------------- 2355 // Verification 2356 2357 class VerifyOopsClosure: public OopClosure { 2358 nmethod* _nm; 2359 bool _ok; 2360 public: 2361 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2362 bool ok() { return _ok; } 2363 virtual void do_oop(oop* p) { 2364 if (oopDesc::is_oop_or_null(*p)) return; 2365 // Print diagnostic information before calling print_nmethod(). 2366 // Assertions therein might prevent call from returning. 2367 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2368 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2369 if (_ok) { 2370 _nm->print_nmethod(true); 2371 _ok = false; 2372 } 2373 } 2374 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2375 }; 2376 2377 class VerifyMetadataClosure: public MetadataClosure { 2378 public: 2379 void do_metadata(Metadata* md) { 2380 if (md->is_method()) { 2381 Method* method = (Method*)md; 2382 assert(!method->is_old(), "Should not be installing old methods"); 2383 } 2384 } 2385 }; 2386 2387 2388 void nmethod::verify() { 2389 2390 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2391 // seems odd. 2392 2393 if (is_zombie() || is_not_entrant() || is_unloaded()) 2394 return; 2395 2396 // Make sure all the entry points are correctly aligned for patching. 2397 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2398 2399 // assert(oopDesc::is_oop(method()), "must be valid"); 2400 2401 ResourceMark rm; 2402 2403 if (!CodeCache::contains(this)) { 2404 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2405 } 2406 2407 if(is_native_method() ) 2408 return; 2409 2410 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2411 if (nm != this) { 2412 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2413 } 2414 2415 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2416 if (! p->verify(this)) { 2417 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2418 } 2419 } 2420 2421 #ifdef ASSERT 2422 #if INCLUDE_JVMCI 2423 { 2424 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap 2425 ImmutableOopMapSet* oms = oop_maps(); 2426 ImplicitExceptionTable implicit_table(this); 2427 for (uint i = 0; i < implicit_table.len(); i++) { 2428 int exec_offset = (int) implicit_table.get_exec_offset(i); 2429 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) { 2430 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc"); 2431 bool found = false; 2432 for (int i = 0, imax = oms->count(); i < imax; i++) { 2433 if (oms->pair_at(i)->pc_offset() == exec_offset) { 2434 found = true; 2435 break; 2436 } 2437 } 2438 assert(found, "missing oopmap"); 2439 } 2440 } 2441 } 2442 #endif 2443 #endif 2444 2445 VerifyOopsClosure voc(this); 2446 oops_do(&voc); 2447 assert(voc.ok(), "embedded oops must be OK"); 2448 Universe::heap()->verify_nmethod(this); 2449 2450 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT, 2451 nm->method()->external_name(), p2i(_oops_do_mark_link)); 2452 verify_scopes(); 2453 2454 CompiledICLocker nm_verify(this); 2455 VerifyMetadataClosure vmc; 2456 metadata_do(&vmc); 2457 } 2458 2459 2460 void nmethod::verify_interrupt_point(address call_site) { 2461 2462 // Verify IC only when nmethod installation is finished. 2463 if (!is_not_installed()) { 2464 if (CompiledICLocker::is_safe(this)) { 2465 CompiledIC_at(this, call_site); 2466 } else { 2467 CompiledICLocker ml_verify(this); 2468 CompiledIC_at(this, call_site); 2469 } 2470 } 2471 2472 HandleMark hm(Thread::current()); 2473 2474 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2475 assert(pd != NULL, "PcDesc must exist"); 2476 for (ScopeDesc* sd = new ScopeDesc(this, pd); 2477 !sd->is_top(); sd = sd->sender()) { 2478 sd->verify(); 2479 } 2480 } 2481 2482 void nmethod::verify_scopes() { 2483 if( !method() ) return; // Runtime stubs have no scope 2484 if (method()->is_native()) return; // Ignore stub methods. 2485 // iterate through all interrupt point 2486 // and verify the debug information is valid. 2487 RelocIterator iter((nmethod*)this); 2488 while (iter.next()) { 2489 address stub = NULL; 2490 switch (iter.type()) { 2491 case relocInfo::virtual_call_type: 2492 verify_interrupt_point(iter.addr()); 2493 break; 2494 case relocInfo::opt_virtual_call_type: 2495 stub = iter.opt_virtual_call_reloc()->static_stub(); 2496 verify_interrupt_point(iter.addr()); 2497 break; 2498 case relocInfo::static_call_type: 2499 stub = iter.static_call_reloc()->static_stub(); 2500 //verify_interrupt_point(iter.addr()); 2501 break; 2502 case relocInfo::runtime_call_type: 2503 case relocInfo::runtime_call_w_cp_type: { 2504 address destination = iter.reloc()->value(); 2505 // Right now there is no way to find out which entries support 2506 // an interrupt point. It would be nice if we had this 2507 // information in a table. 2508 break; 2509 } 2510 default: 2511 break; 2512 } 2513 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2514 } 2515 } 2516 2517 2518 // ----------------------------------------------------------------------------- 2519 // Printing operations 2520 2521 void nmethod::print() const { 2522 ttyLocker ttyl; // keep the following output all in one block 2523 print(tty); 2524 } 2525 2526 void nmethod::print(outputStream* st) const { 2527 ResourceMark rm; 2528 2529 st->print("Compiled method "); 2530 2531 if (is_compiled_by_c1()) { 2532 st->print("(c1) "); 2533 } else if (is_compiled_by_c2()) { 2534 st->print("(c2) "); 2535 } else if (is_compiled_by_jvmci()) { 2536 st->print("(JVMCI) "); 2537 } else { 2538 st->print("(n/a) "); 2539 } 2540 2541 print_on(st, NULL); 2542 2543 if (WizardMode) { 2544 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2545 st->print(" for method " INTPTR_FORMAT , p2i(method())); 2546 st->print(" { "); 2547 st->print_cr("%s ", state()); 2548 st->print_cr("}:"); 2549 } 2550 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2551 p2i(this), 2552 p2i(this) + size(), 2553 size()); 2554 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2555 p2i(relocation_begin()), 2556 p2i(relocation_end()), 2557 relocation_size()); 2558 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2559 p2i(consts_begin()), 2560 p2i(consts_end()), 2561 consts_size()); 2562 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2563 p2i(insts_begin()), 2564 p2i(insts_end()), 2565 insts_size()); 2566 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2567 p2i(stub_begin()), 2568 p2i(stub_end()), 2569 stub_size()); 2570 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2571 p2i(oops_begin()), 2572 p2i(oops_end()), 2573 oops_size()); 2574 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2575 p2i(metadata_begin()), 2576 p2i(metadata_end()), 2577 metadata_size()); 2578 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2579 p2i(scopes_data_begin()), 2580 p2i(scopes_data_end()), 2581 scopes_data_size()); 2582 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2583 p2i(scopes_pcs_begin()), 2584 p2i(scopes_pcs_end()), 2585 scopes_pcs_size()); 2586 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2587 p2i(dependencies_begin()), 2588 p2i(dependencies_end()), 2589 dependencies_size()); 2590 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2591 p2i(handler_table_begin()), 2592 p2i(handler_table_end()), 2593 handler_table_size()); 2594 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2595 p2i(nul_chk_table_begin()), 2596 p2i(nul_chk_table_end()), 2597 nul_chk_table_size()); 2598 #if INCLUDE_JVMCI 2599 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2600 p2i(speculations_begin()), 2601 p2i(speculations_end()), 2602 speculations_size()); 2603 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2604 p2i(jvmci_data_begin()), 2605 p2i(jvmci_data_end()), 2606 jvmci_data_size()); 2607 #endif 2608 } 2609 2610 void nmethod::print_code() { 2611 ResourceMark m; 2612 ttyLocker ttyl; 2613 // Call the specialized decode method of this class. 2614 decode(tty); 2615 } 2616 2617 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN 2618 2619 void nmethod::print_dependencies() { 2620 ResourceMark rm; 2621 ttyLocker ttyl; // keep the following output all in one block 2622 tty->print_cr("Dependencies:"); 2623 for (Dependencies::DepStream deps(this); deps.next(); ) { 2624 deps.print_dependency(); 2625 Klass* ctxk = deps.context_type(); 2626 if (ctxk != NULL) { 2627 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2628 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2629 } 2630 } 2631 deps.log_dependency(); // put it into the xml log also 2632 } 2633 } 2634 #endif 2635 2636 #if defined(SUPPORT_DATA_STRUCTS) 2637 2638 // Print the oops from the underlying CodeBlob. 2639 void nmethod::print_oops(outputStream* st) { 2640 ResourceMark m; 2641 st->print("Oops:"); 2642 if (oops_begin() < oops_end()) { 2643 st->cr(); 2644 for (oop* p = oops_begin(); p < oops_end(); p++) { 2645 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false); 2646 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2647 if (Universe::contains_non_oop_word(p)) { 2648 st->print_cr("NON_OOP"); 2649 continue; // skip non-oops 2650 } 2651 if (*p == NULL) { 2652 st->print_cr("NULL-oop"); 2653 continue; // skip non-oops 2654 } 2655 (*p)->print_value_on(st); 2656 st->cr(); 2657 } 2658 } else { 2659 st->print_cr(" <list empty>"); 2660 } 2661 } 2662 2663 // Print metadata pool. 2664 void nmethod::print_metadata(outputStream* st) { 2665 ResourceMark m; 2666 st->print("Metadata:"); 2667 if (metadata_begin() < metadata_end()) { 2668 st->cr(); 2669 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2670 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false); 2671 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2672 if (*p && *p != Universe::non_oop_word()) { 2673 (*p)->print_value_on(st); 2674 } 2675 st->cr(); 2676 } 2677 } else { 2678 st->print_cr(" <list empty>"); 2679 } 2680 } 2681 2682 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN 2683 void nmethod::print_scopes_on(outputStream* st) { 2684 // Find the first pc desc for all scopes in the code and print it. 2685 ResourceMark rm; 2686 st->print("scopes:"); 2687 if (scopes_pcs_begin() < scopes_pcs_end()) { 2688 st->cr(); 2689 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2690 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2691 continue; 2692 2693 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2694 while (sd != NULL) { 2695 sd->print_on(st, p); // print output ends with a newline 2696 sd = sd->sender(); 2697 } 2698 } 2699 } else { 2700 st->print_cr(" <list empty>"); 2701 } 2702 } 2703 #endif 2704 2705 #ifndef PRODUCT // RelocIterator does support printing only then. 2706 void nmethod::print_relocations() { 2707 ResourceMark m; // in case methods get printed via the debugger 2708 tty->print_cr("relocations:"); 2709 RelocIterator iter(this); 2710 iter.print(); 2711 } 2712 #endif 2713 2714 void nmethod::print_pcs_on(outputStream* st) { 2715 ResourceMark m; // in case methods get printed via debugger 2716 st->print("pc-bytecode offsets:"); 2717 if (scopes_pcs_begin() < scopes_pcs_end()) { 2718 st->cr(); 2719 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2720 p->print_on(st, this); // print output ends with a newline 2721 } 2722 } else { 2723 st->print_cr(" <list empty>"); 2724 } 2725 } 2726 2727 void nmethod::print_native_invokers() { 2728 ResourceMark m; // in case methods get printed via debugger 2729 tty->print_cr("Native invokers:"); 2730 for (RuntimeStub** itt = native_invokers_begin(); itt < native_invokers_end(); itt++) { 2731 (*itt)->print_on(tty); 2732 } 2733 } 2734 2735 void nmethod::print_handler_table() { 2736 ExceptionHandlerTable(this).print(code_begin()); 2737 } 2738 2739 void nmethod::print_nul_chk_table() { 2740 ImplicitExceptionTable(this).print(code_begin()); 2741 } 2742 2743 void nmethod::print_recorded_oop(int log_n, int i) { 2744 void* value; 2745 2746 if (i == 0) { 2747 value = NULL; 2748 } else { 2749 // Be careful around non-oop words. Don't create an oop 2750 // with that value, or it will assert in verification code. 2751 if (Universe::contains_non_oop_word(oop_addr_at(i))) { 2752 value = Universe::non_oop_word(); 2753 } else { 2754 value = oop_at(i); 2755 } 2756 } 2757 2758 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(value)); 2759 2760 if (value == Universe::non_oop_word()) { 2761 tty->print("non-oop word"); 2762 } else { 2763 if (value == 0) { 2764 tty->print("NULL-oop"); 2765 } else { 2766 oop_at(i)->print_value_on(tty); 2767 } 2768 } 2769 2770 tty->cr(); 2771 } 2772 2773 void nmethod::print_recorded_oops() { 2774 const int n = oops_count(); 2775 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2776 tty->print("Recorded oops:"); 2777 if (n > 0) { 2778 tty->cr(); 2779 for (int i = 0; i < n; i++) { 2780 print_recorded_oop(log_n, i); 2781 } 2782 } else { 2783 tty->print_cr(" <list empty>"); 2784 } 2785 } 2786 2787 void nmethod::print_recorded_metadata() { 2788 const int n = metadata_count(); 2789 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2790 tty->print("Recorded metadata:"); 2791 if (n > 0) { 2792 tty->cr(); 2793 for (int i = 0; i < n; i++) { 2794 Metadata* m = metadata_at(i); 2795 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m)); 2796 if (m == (Metadata*)Universe::non_oop_word()) { 2797 tty->print("non-metadata word"); 2798 } else if (m == NULL) { 2799 tty->print("NULL-oop"); 2800 } else { 2801 Metadata::print_value_on_maybe_null(tty, m); 2802 } 2803 tty->cr(); 2804 } 2805 } else { 2806 tty->print_cr(" <list empty>"); 2807 } 2808 } 2809 #endif 2810 2811 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2812 2813 void nmethod::print_constant_pool(outputStream* st) { 2814 //----------------------------------- 2815 //---< Print the constant pool >--- 2816 //----------------------------------- 2817 int consts_size = this->consts_size(); 2818 if ( consts_size > 0 ) { 2819 unsigned char* cstart = this->consts_begin(); 2820 unsigned char* cp = cstart; 2821 unsigned char* cend = cp + consts_size; 2822 unsigned int bytes_per_line = 4; 2823 unsigned int CP_alignment = 8; 2824 unsigned int n; 2825 2826 st->cr(); 2827 2828 //---< print CP header to make clear what's printed >--- 2829 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) { 2830 n = bytes_per_line; 2831 st->print_cr("[Constant Pool]"); 2832 Disassembler::print_location(cp, cstart, cend, st, true, true); 2833 Disassembler::print_hexdata(cp, n, st, true); 2834 st->cr(); 2835 } else { 2836 n = (uintptr_t)cp&(bytes_per_line-1); 2837 st->print_cr("[Constant Pool (unaligned)]"); 2838 } 2839 2840 //---< print CP contents, bytes_per_line at a time >--- 2841 while (cp < cend) { 2842 Disassembler::print_location(cp, cstart, cend, st, true, false); 2843 Disassembler::print_hexdata(cp, n, st, false); 2844 cp += n; 2845 n = bytes_per_line; 2846 st->cr(); 2847 } 2848 2849 //---< Show potential alignment gap between constant pool and code >--- 2850 cend = code_begin(); 2851 if( cp < cend ) { 2852 n = 4; 2853 st->print_cr("[Code entry alignment]"); 2854 while (cp < cend) { 2855 Disassembler::print_location(cp, cstart, cend, st, false, false); 2856 cp += n; 2857 st->cr(); 2858 } 2859 } 2860 } else { 2861 st->print_cr("[Constant Pool (empty)]"); 2862 } 2863 st->cr(); 2864 } 2865 2866 #endif 2867 2868 // Disassemble this nmethod. 2869 // Print additional debug information, if requested. This could be code 2870 // comments, block comments, profiling counters, etc. 2871 // The undisassembled format is useful no disassembler library is available. 2872 // The resulting hex dump (with markers) can be disassembled later, or on 2873 // another system, when/where a disassembler library is available. 2874 void nmethod::decode2(outputStream* ost) const { 2875 2876 // Called from frame::back_trace_with_decode without ResourceMark. 2877 ResourceMark rm; 2878 2879 // Make sure we have a valid stream to print on. 2880 outputStream* st = ost ? ost : tty; 2881 2882 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY) 2883 const bool use_compressed_format = true; 2884 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2885 AbstractDisassembler::show_block_comment()); 2886 #else 2887 const bool use_compressed_format = Disassembler::is_abstract(); 2888 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2889 AbstractDisassembler::show_block_comment()); 2890 #endif 2891 2892 // Decoding an nmethod can write to a PcDescCache (see PcDescCache::add_pc_desc) 2893 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());) 2894 2895 st->cr(); 2896 this->print(st); 2897 st->cr(); 2898 2899 #if defined(SUPPORT_ASSEMBLY) 2900 //---------------------------------- 2901 //---< Print real disassembly >--- 2902 //---------------------------------- 2903 if (! use_compressed_format) { 2904 st->print_cr("[Disassembly]"); 2905 Disassembler::decode(const_cast<nmethod*>(this), st); 2906 st->bol(); 2907 st->print_cr("[/Disassembly]"); 2908 return; 2909 } 2910 #endif 2911 2912 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2913 2914 // Compressed undisassembled disassembly format. 2915 // The following stati are defined/supported: 2916 // = 0 - currently at bol() position, nothing printed yet on current line. 2917 // = 1 - currently at position after print_location(). 2918 // > 1 - in the midst of printing instruction stream bytes. 2919 int compressed_format_idx = 0; 2920 int code_comment_column = 0; 2921 const int instr_maxlen = Assembler::instr_maxlen(); 2922 const uint tabspacing = 8; 2923 unsigned char* start = this->code_begin(); 2924 unsigned char* p = this->code_begin(); 2925 unsigned char* end = this->code_end(); 2926 unsigned char* pss = p; // start of a code section (used for offsets) 2927 2928 if ((start == NULL) || (end == NULL)) { 2929 st->print_cr("PrintAssembly not possible due to uninitialized section pointers"); 2930 return; 2931 } 2932 #endif 2933 2934 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2935 //---< plain abstract disassembly, no comments or anything, just section headers >--- 2936 if (use_compressed_format && ! compressed_with_comments) { 2937 const_cast<nmethod*>(this)->print_constant_pool(st); 2938 2939 //---< Open the output (Marker for post-mortem disassembler) >--- 2940 st->print_cr("[MachCode]"); 2941 const char* header = NULL; 2942 address p0 = p; 2943 while (p < end) { 2944 address pp = p; 2945 while ((p < end) && (header == NULL)) { 2946 header = nmethod_section_label(p); 2947 pp = p; 2948 p += Assembler::instr_len(p); 2949 } 2950 if (pp > p0) { 2951 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen()); 2952 p0 = pp; 2953 p = pp; 2954 header = NULL; 2955 } else if (header != NULL) { 2956 st->bol(); 2957 st->print_cr("%s", header); 2958 header = NULL; 2959 } 2960 } 2961 //---< Close the output (Marker for post-mortem disassembler) >--- 2962 st->bol(); 2963 st->print_cr("[/MachCode]"); 2964 return; 2965 } 2966 #endif 2967 2968 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2969 //---< abstract disassembly with comments and section headers merged in >--- 2970 if (compressed_with_comments) { 2971 const_cast<nmethod*>(this)->print_constant_pool(st); 2972 2973 //---< Open the output (Marker for post-mortem disassembler) >--- 2974 st->print_cr("[MachCode]"); 2975 while ((p < end) && (p != NULL)) { 2976 const int instruction_size_in_bytes = Assembler::instr_len(p); 2977 2978 //---< Block comments for nmethod. Interrupts instruction stream, if any. >--- 2979 // Outputs a bol() before and a cr() after, but only if a comment is printed. 2980 // Prints nmethod_section_label as well. 2981 if (AbstractDisassembler::show_block_comment()) { 2982 print_block_comment(st, p); 2983 if (st->position() == 0) { 2984 compressed_format_idx = 0; 2985 } 2986 } 2987 2988 //---< New location information after line break >--- 2989 if (compressed_format_idx == 0) { 2990 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2991 compressed_format_idx = 1; 2992 } 2993 2994 //---< Code comment for current instruction. Address range [p..(p+len)) >--- 2995 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes; 2996 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end 2997 2998 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) { 2999 //---< interrupt instruction byte stream for code comment >--- 3000 if (compressed_format_idx > 1) { 3001 st->cr(); // interrupt byte stream 3002 st->cr(); // add an empty line 3003 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 3004 } 3005 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end ); 3006 st->bol(); 3007 compressed_format_idx = 0; 3008 } 3009 3010 //---< New location information after line break >--- 3011 if (compressed_format_idx == 0) { 3012 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 3013 compressed_format_idx = 1; 3014 } 3015 3016 //---< Nicely align instructions for readability >--- 3017 if (compressed_format_idx > 1) { 3018 Disassembler::print_delimiter(st); 3019 } 3020 3021 //---< Now, finally, print the actual instruction bytes >--- 3022 unsigned char* p0 = p; 3023 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen); 3024 compressed_format_idx += p - p0; 3025 3026 if (Disassembler::start_newline(compressed_format_idx-1)) { 3027 st->cr(); 3028 compressed_format_idx = 0; 3029 } 3030 } 3031 //---< Close the output (Marker for post-mortem disassembler) >--- 3032 st->bol(); 3033 st->print_cr("[/MachCode]"); 3034 return; 3035 } 3036 #endif 3037 } 3038 3039 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 3040 3041 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3042 RelocIterator iter(this, begin, end); 3043 bool have_one = false; 3044 while (iter.next()) { 3045 have_one = true; 3046 switch (iter.type()) { 3047 case relocInfo::none: return "no_reloc"; 3048 case relocInfo::oop_type: { 3049 // Get a non-resizable resource-allocated stringStream. 3050 // Our callees make use of (nested) ResourceMarks. 3051 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024); 3052 oop_Relocation* r = iter.oop_reloc(); 3053 oop obj = r->oop_value(); 3054 st.print("oop("); 3055 if (obj == NULL) st.print("NULL"); 3056 else obj->print_value_on(&st); 3057 st.print(")"); 3058 return st.as_string(); 3059 } 3060 case relocInfo::metadata_type: { 3061 stringStream st; 3062 metadata_Relocation* r = iter.metadata_reloc(); 3063 Metadata* obj = r->metadata_value(); 3064 st.print("metadata("); 3065 if (obj == NULL) st.print("NULL"); 3066 else obj->print_value_on(&st); 3067 st.print(")"); 3068 return st.as_string(); 3069 } 3070 case relocInfo::runtime_call_type: 3071 case relocInfo::runtime_call_w_cp_type: { 3072 stringStream st; 3073 st.print("runtime_call"); 3074 CallRelocation* r = (CallRelocation*)iter.reloc(); 3075 address dest = r->destination(); 3076 CodeBlob* cb = CodeCache::find_blob(dest); 3077 if (cb != NULL) { 3078 st.print(" %s", cb->name()); 3079 } else { 3080 ResourceMark rm; 3081 const int buflen = 1024; 3082 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 3083 int offset; 3084 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 3085 st.print(" %s", buf); 3086 if (offset != 0) { 3087 st.print("+%d", offset); 3088 } 3089 } 3090 } 3091 return st.as_string(); 3092 } 3093 case relocInfo::virtual_call_type: { 3094 stringStream st; 3095 st.print_raw("virtual_call"); 3096 virtual_call_Relocation* r = iter.virtual_call_reloc(); 3097 Method* m = r->method_value(); 3098 if (m != NULL) { 3099 assert(m->is_method(), ""); 3100 m->print_short_name(&st); 3101 } 3102 return st.as_string(); 3103 } 3104 case relocInfo::opt_virtual_call_type: { 3105 stringStream st; 3106 st.print_raw("optimized virtual_call"); 3107 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 3108 Method* m = r->method_value(); 3109 if (m != NULL) { 3110 assert(m->is_method(), ""); 3111 m->print_short_name(&st); 3112 } 3113 return st.as_string(); 3114 } 3115 case relocInfo::static_call_type: { 3116 stringStream st; 3117 st.print_raw("static_call"); 3118 static_call_Relocation* r = iter.static_call_reloc(); 3119 Method* m = r->method_value(); 3120 if (m != NULL) { 3121 assert(m->is_method(), ""); 3122 m->print_short_name(&st); 3123 } 3124 return st.as_string(); 3125 } 3126 case relocInfo::static_stub_type: return "static_stub"; 3127 case relocInfo::external_word_type: return "external_word"; 3128 case relocInfo::internal_word_type: return "internal_word"; 3129 case relocInfo::section_word_type: return "section_word"; 3130 case relocInfo::poll_type: return "poll"; 3131 case relocInfo::poll_return_type: return "poll_return"; 3132 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 3133 case relocInfo::type_mask: return "type_bit_mask"; 3134 3135 default: 3136 break; 3137 } 3138 } 3139 return have_one ? "other" : NULL; 3140 } 3141 3142 // Return a the last scope in (begin..end] 3143 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3144 PcDesc* p = pc_desc_near(begin+1); 3145 if (p != NULL && p->real_pc(this) <= end) { 3146 return new ScopeDesc(this, p); 3147 } 3148 return NULL; 3149 } 3150 3151 const char* nmethod::nmethod_section_label(address pos) const { 3152 const char* label = NULL; 3153 if (pos == code_begin()) label = "[Instructions begin]"; 3154 if (pos == entry_point()) label = "[Entry Point]"; 3155 if (pos == inline_entry_point()) label = "[Inline Entry Point]"; 3156 if (pos == verified_entry_point()) label = "[Verified Entry Point]"; 3157 if (pos == verified_inline_entry_point()) label = "[Verified Inline Entry Point]"; 3158 if (pos == verified_inline_ro_entry_point()) label = "[Verified Inline Entry Point (RO)]"; 3159 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]"; 3160 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]"; 3161 // Check stub_code before checking exception_handler or deopt_handler. 3162 if (pos == this->stub_begin()) label = "[Stub Code]"; 3163 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]"; 3164 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]"; 3165 return label; 3166 } 3167 3168 static int maybe_print_entry_label(outputStream* stream, address pos, address entry, const char* label) { 3169 if (pos == entry) { 3170 stream->bol(); 3171 stream->print_cr("%s", label); 3172 return 1; 3173 } else { 3174 return 0; 3175 } 3176 } 3177 3178 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const { 3179 if (print_section_labels) { 3180 int n = 0; 3181 // Multiple entry points may be at the same position. Print them all. 3182 n += maybe_print_entry_label(stream, block_begin, entry_point(), "[Entry Point]"); 3183 n += maybe_print_entry_label(stream, block_begin, inline_entry_point(), "[Inline Entry Point]"); 3184 n += maybe_print_entry_label(stream, block_begin, verified_entry_point(), "[Verified Entry Point]"); 3185 n += maybe_print_entry_label(stream, block_begin, verified_inline_entry_point(), "[Verified Inline Entry Point]"); 3186 n += maybe_print_entry_label(stream, block_begin, verified_inline_ro_entry_point(), "[Verified Inline Entry Point (RO)]"); 3187 if (n == 0) { 3188 const char* label = nmethod_section_label(block_begin); 3189 if (label != NULL) { 3190 stream->bol(); 3191 stream->print_cr("%s", label); 3192 } 3193 } 3194 } 3195 3196 Method* m = method(); 3197 if (m == NULL || is_osr_method()) { 3198 return; 3199 } 3200 3201 // Print the name of the method (only once) 3202 address low = MIN4(entry_point(), verified_entry_point(), verified_inline_entry_point(), verified_inline_ro_entry_point()); 3203 low = MIN2(low, inline_entry_point()); 3204 assert(low != 0, "sanity"); 3205 if (block_begin == low) { 3206 stream->print(" # "); 3207 m->print_value_on(stream); 3208 stream->cr(); 3209 } 3210 3211 // Print the arguments for the 3 types of verified entry points 3212 CompiledEntrySignature ces(m); 3213 ces.compute_calling_conventions(); 3214 const GrowableArray<SigEntry>* sig_cc; 3215 const VMRegPair* regs; 3216 if (block_begin == verified_entry_point()) { 3217 sig_cc = &ces.sig_cc(); 3218 regs = ces.regs_cc(); 3219 } else if (block_begin == verified_inline_entry_point()) { 3220 sig_cc = &ces.sig(); 3221 regs = ces.regs(); 3222 } else if (block_begin == verified_inline_ro_entry_point()) { 3223 sig_cc = &ces.sig_cc_ro(); 3224 regs = ces.regs_cc_ro(); 3225 } else { 3226 return; 3227 } 3228 3229 bool has_this = !m->is_static(); 3230 if (ces.has_inline_recv() && block_begin == verified_entry_point()) { 3231 // <this> argument is scalarized for verified_entry_point() 3232 has_this = false; 3233 } 3234 const char* spname = "sp"; // make arch-specific? 3235 int stack_slot_offset = this->frame_size() * wordSize; 3236 int tab1 = 14, tab2 = 24; 3237 int sig_index = 0; 3238 int arg_index = has_this ? -1 : 0; 3239 bool did_old_sp = false; 3240 for (ExtendedSignature sig = ExtendedSignature(sig_cc, SigEntryFilter()); !sig.at_end(); ++sig) { 3241 bool at_this = (arg_index == -1); 3242 bool at_old_sp = false; 3243 BasicType t = (*sig)._bt; 3244 if (at_this) { 3245 stream->print(" # this: "); 3246 } else { 3247 stream->print(" # parm%d: ", arg_index); 3248 } 3249 stream->move_to(tab1); 3250 VMReg fst = regs[sig_index].first(); 3251 VMReg snd = regs[sig_index].second(); 3252 if (fst->is_reg()) { 3253 stream->print("%s", fst->name()); 3254 if (snd->is_valid()) { 3255 stream->print(":%s", snd->name()); 3256 } 3257 } else if (fst->is_stack()) { 3258 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3259 if (offset == stack_slot_offset) at_old_sp = true; 3260 stream->print("[%s+0x%x]", spname, offset); 3261 } else { 3262 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3263 } 3264 stream->print(" "); 3265 stream->move_to(tab2); 3266 stream->print("= "); 3267 if (at_this) { 3268 m->method_holder()->print_value_on(stream); 3269 } else { 3270 bool did_name = false; 3271 if (is_reference_type(t)) { 3272 Symbol* name = (*sig)._symbol; 3273 name->print_value_on(stream); 3274 did_name = true; 3275 } 3276 if (!did_name) 3277 stream->print("%s", type2name(t)); 3278 } 3279 if (at_old_sp) { 3280 stream->print(" (%s of caller)", spname); 3281 did_old_sp = true; 3282 } 3283 stream->cr(); 3284 sig_index += type2size[t]; 3285 arg_index += 1; 3286 } 3287 if (!did_old_sp) { 3288 stream->print(" # "); 3289 stream->move_to(tab1); 3290 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3291 stream->print(" (%s of caller)", spname); 3292 stream->cr(); 3293 } 3294 } 3295 3296 // Returns whether this nmethod has code comments. 3297 bool nmethod::has_code_comment(address begin, address end) { 3298 // scopes? 3299 ScopeDesc* sd = scope_desc_in(begin, end); 3300 if (sd != NULL) return true; 3301 3302 // relocations? 3303 const char* str = reloc_string_for(begin, end); 3304 if (str != NULL) return true; 3305 3306 // implicit exceptions? 3307 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin()); 3308 if (cont_offset != 0) return true; 3309 3310 return false; 3311 } 3312 3313 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) { 3314 ImplicitExceptionTable implicit_table(this); 3315 int pc_offset = begin - code_begin(); 3316 int cont_offset = implicit_table.continuation_offset(pc_offset); 3317 bool oop_map_required = false; 3318 if (cont_offset != 0) { 3319 st->move_to(column, 6, 0); 3320 if (pc_offset == cont_offset) { 3321 st->print("; implicit exception: deoptimizes"); 3322 oop_map_required = true; 3323 } else { 3324 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3325 } 3326 } 3327 3328 // Find an oopmap in (begin, end]. We use the odd half-closed 3329 // interval so that oop maps and scope descs which are tied to the 3330 // byte after a call are printed with the call itself. OopMaps 3331 // associated with implicit exceptions are printed with the implicit 3332 // instruction. 3333 address base = code_begin(); 3334 ImmutableOopMapSet* oms = oop_maps(); 3335 if (oms != NULL) { 3336 for (int i = 0, imax = oms->count(); i < imax; i++) { 3337 const ImmutableOopMapPair* pair = oms->pair_at(i); 3338 const ImmutableOopMap* om = pair->get_from(oms); 3339 address pc = base + pair->pc_offset(); 3340 if (pc >= begin) { 3341 #if INCLUDE_JVMCI 3342 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset(); 3343 #else 3344 bool is_implicit_deopt = false; 3345 #endif 3346 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) { 3347 st->move_to(column, 6, 0); 3348 st->print("; "); 3349 om->print_on(st); 3350 oop_map_required = false; 3351 } 3352 } 3353 if (pc > end) { 3354 break; 3355 } 3356 } 3357 } 3358 assert(!oop_map_required, "missed oopmap"); 3359 3360 Thread* thread = Thread::current(); 3361 3362 // Print any debug info present at this pc. 3363 ScopeDesc* sd = scope_desc_in(begin, end); 3364 if (sd != NULL) { 3365 st->move_to(column, 6, 0); 3366 if (sd->bci() == SynchronizationEntryBCI) { 3367 st->print(";*synchronization entry"); 3368 } else if (sd->bci() == AfterBci) { 3369 st->print(";* method exit (unlocked if synchronized)"); 3370 } else if (sd->bci() == UnwindBci) { 3371 st->print(";* unwind (locked if synchronized)"); 3372 } else if (sd->bci() == AfterExceptionBci) { 3373 st->print(";* unwind (unlocked if synchronized)"); 3374 } else if (sd->bci() == UnknownBci) { 3375 st->print(";* unknown"); 3376 } else if (sd->bci() == InvalidFrameStateBci) { 3377 st->print(";* invalid frame state"); 3378 } else { 3379 if (sd->method() == NULL) { 3380 st->print("method is NULL"); 3381 } else if (sd->method()->is_native()) { 3382 st->print("method is native"); 3383 } else { 3384 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3385 st->print(";*%s", Bytecodes::name(bc)); 3386 switch (bc) { 3387 case Bytecodes::_invokevirtual: 3388 case Bytecodes::_invokespecial: 3389 case Bytecodes::_invokestatic: 3390 case Bytecodes::_invokeinterface: 3391 { 3392 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci()); 3393 st->print(" "); 3394 if (invoke.name() != NULL) 3395 invoke.name()->print_symbol_on(st); 3396 else 3397 st->print("<UNKNOWN>"); 3398 break; 3399 } 3400 case Bytecodes::_getfield: 3401 case Bytecodes::_putfield: 3402 case Bytecodes::_getstatic: 3403 case Bytecodes::_putstatic: 3404 { 3405 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci()); 3406 st->print(" "); 3407 if (field.name() != NULL) 3408 field.name()->print_symbol_on(st); 3409 else 3410 st->print("<UNKNOWN>"); 3411 } 3412 default: 3413 break; 3414 } 3415 } 3416 st->print(" {reexecute=%d rethrow=%d return_oop=%d return_scalarized=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop(), sd->return_scalarized()); 3417 } 3418 3419 // Print all scopes 3420 for (;sd != NULL; sd = sd->sender()) { 3421 st->move_to(column, 6, 0); 3422 st->print("; -"); 3423 if (sd->should_reexecute()) { 3424 st->print(" (reexecute)"); 3425 } 3426 if (sd->method() == NULL) { 3427 st->print("method is NULL"); 3428 } else { 3429 sd->method()->print_short_name(st); 3430 } 3431 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3432 if (lineno != -1) { 3433 st->print("@%d (line %d)", sd->bci(), lineno); 3434 } else { 3435 st->print("@%d", sd->bci()); 3436 } 3437 st->cr(); 3438 } 3439 } 3440 3441 // Print relocation information 3442 // Prevent memory leak: allocating without ResourceMark. 3443 ResourceMark rm; 3444 const char* str = reloc_string_for(begin, end); 3445 if (str != NULL) { 3446 if (sd != NULL) st->cr(); 3447 st->move_to(column, 6, 0); 3448 st->print("; {%s}", str); 3449 } 3450 } 3451 3452 #endif 3453 3454 class DirectNativeCallWrapper: public NativeCallWrapper { 3455 private: 3456 NativeCall* _call; 3457 3458 public: 3459 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 3460 3461 virtual address destination() const { return _call->destination(); } 3462 virtual address instruction_address() const { return _call->instruction_address(); } 3463 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 3464 virtual address return_address() const { return _call->return_address(); } 3465 3466 virtual address get_resolve_call_stub(bool is_optimized) const { 3467 if (is_optimized) { 3468 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 3469 } 3470 return SharedRuntime::get_resolve_virtual_call_stub(); 3471 } 3472 3473 virtual void set_destination_mt_safe(address dest) { 3474 _call->set_destination_mt_safe(dest); 3475 } 3476 3477 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 3478 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3479 { 3480 csc->set_to_interpreted(method, info.entry()); 3481 } 3482 } 3483 3484 virtual void verify() const { 3485 // make sure code pattern is actually a call imm32 instruction 3486 _call->verify(); 3487 _call->verify_alignment(); 3488 } 3489 3490 virtual void verify_resolve_call(address dest) const { 3491 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 3492 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 3493 } 3494 3495 virtual bool is_call_to_interpreted(address dest) const { 3496 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 3497 return cb->contains(dest); 3498 } 3499 3500 virtual bool is_safe_for_patching() const { return false; } 3501 3502 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 3503 return nativeMovConstReg_at(r->cached_value()); 3504 } 3505 3506 virtual void *get_data(NativeInstruction* instruction) const { 3507 return (void*)((NativeMovConstReg*) instruction)->data(); 3508 } 3509 3510 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 3511 ((NativeMovConstReg*) instruction)->set_data(data); 3512 } 3513 }; 3514 3515 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 3516 return new DirectNativeCallWrapper((NativeCall*) call); 3517 } 3518 3519 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 3520 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 3521 } 3522 3523 address nmethod::call_instruction_address(address pc) const { 3524 if (NativeCall::is_call_before(pc)) { 3525 NativeCall *ncall = nativeCall_before(pc); 3526 return ncall->instruction_address(); 3527 } 3528 return NULL; 3529 } 3530 3531 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 3532 return CompiledDirectStaticCall::at(call_site); 3533 } 3534 3535 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 3536 return CompiledDirectStaticCall::at(call_site); 3537 } 3538 3539 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 3540 return CompiledDirectStaticCall::before(return_addr); 3541 } 3542 3543 #if defined(SUPPORT_DATA_STRUCTS) 3544 void nmethod::print_value_on(outputStream* st) const { 3545 st->print("nmethod"); 3546 print_on(st, NULL); 3547 } 3548 #endif 3549 3550 #ifndef PRODUCT 3551 3552 void nmethod::print_calls(outputStream* st) { 3553 RelocIterator iter(this); 3554 while (iter.next()) { 3555 switch (iter.type()) { 3556 case relocInfo::virtual_call_type: 3557 case relocInfo::opt_virtual_call_type: { 3558 CompiledICLocker ml_verify(this); 3559 CompiledIC_at(&iter)->print(); 3560 break; 3561 } 3562 case relocInfo::static_call_type: 3563 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3564 CompiledDirectStaticCall::at(iter.reloc())->print(); 3565 break; 3566 default: 3567 break; 3568 } 3569 } 3570 } 3571 3572 void nmethod::print_statistics() { 3573 ttyLocker ttyl; 3574 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3575 native_nmethod_stats.print_native_nmethod_stats(); 3576 #ifdef COMPILER1 3577 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3578 #endif 3579 #ifdef COMPILER2 3580 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3581 #endif 3582 #if INCLUDE_JVMCI 3583 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3584 #endif 3585 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3586 DebugInformationRecorder::print_statistics(); 3587 #ifndef PRODUCT 3588 pc_nmethod_stats.print_pc_stats(); 3589 #endif 3590 Dependencies::print_statistics(); 3591 if (xtty != NULL) xtty->tail("statistics"); 3592 } 3593 3594 #endif // !PRODUCT 3595 3596 #if INCLUDE_JVMCI 3597 void nmethod::update_speculation(JavaThread* thread) { 3598 jlong speculation = thread->pending_failed_speculation(); 3599 if (speculation != 0) { 3600 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list"); 3601 jvmci_nmethod_data()->add_failed_speculation(this, speculation); 3602 thread->set_pending_failed_speculation(0); 3603 } 3604 } 3605 3606 const char* nmethod::jvmci_name() { 3607 if (jvmci_nmethod_data() != NULL) { 3608 return jvmci_nmethod_data()->name(); 3609 } 3610 return NULL; 3611 } 3612 #endif