1 /* 2 * Copyright (c) 1997, 2020, 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 "interpreter/bytecode.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logStream.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "memory/resourceArea.hpp" 46 #include "memory/universe.hpp" 47 #include "oops/access.inline.hpp" 48 #include "oops/method.inline.hpp" 49 #include "oops/methodData.hpp" 50 #include "oops/oop.inline.hpp" 51 #include "prims/jvmtiImpl.hpp" 52 #include "prims/jvmtiThreadState.hpp" 53 #include "runtime/atomic.hpp" 54 #include "runtime/deoptimization.hpp" 55 #include "runtime/flags/flagSetting.hpp" 56 #include "runtime/frame.inline.hpp" 57 #include "runtime/handles.inline.hpp" 58 #include "runtime/jniHandles.inline.hpp" 59 #include "runtime/orderAccess.hpp" 60 #include "runtime/os.hpp" 61 #include "runtime/safepointVerifiers.hpp" 62 #include "runtime/serviceThread.hpp" 63 #include "runtime/sharedRuntime.hpp" 64 #include "runtime/sweeper.hpp" 65 #include "runtime/vmThread.hpp" 66 #include "utilities/align.hpp" 67 #include "utilities/dtrace.hpp" 68 #include "utilities/events.hpp" 69 #include "utilities/resourceHash.hpp" 70 #include "utilities/xmlstream.hpp" 71 #if INCLUDE_JVMCI 72 #include "jvmci/jvmciRuntime.hpp" 73 #endif 74 75 #ifdef DTRACE_ENABLED 76 77 // Only bother with this argument setup if dtrace is available 78 79 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 80 { \ 81 Method* m = (method); \ 82 if (m != NULL) { \ 83 Symbol* klass_name = m->klass_name(); \ 84 Symbol* name = m->name(); \ 85 Symbol* signature = m->signature(); \ 86 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 87 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 88 (char *) name->bytes(), name->utf8_length(), \ 89 (char *) signature->bytes(), signature->utf8_length()); \ 90 } \ 91 } 92 93 #else // ndef DTRACE_ENABLED 94 95 #define DTRACE_METHOD_UNLOAD_PROBE(method) 96 97 #endif 98 99 //--------------------------------------------------------------------------------- 100 // NMethod statistics 101 // They are printed under various flags, including: 102 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 103 // (In the latter two cases, they like other stats are printed to the log only.) 104 105 #ifndef PRODUCT 106 // These variables are put into one block to reduce relocations 107 // and make it simpler to print from the debugger. 108 struct java_nmethod_stats_struct { 109 int nmethod_count; 110 int total_size; 111 int relocation_size; 112 int consts_size; 113 int insts_size; 114 int stub_size; 115 int scopes_data_size; 116 int scopes_pcs_size; 117 int dependencies_size; 118 int handler_table_size; 119 int nul_chk_table_size; 120 #if INCLUDE_JVMCI 121 int speculations_size; 122 int jvmci_data_size; 123 #endif 124 int oops_size; 125 int metadata_size; 126 127 void note_nmethod(nmethod* nm) { 128 nmethod_count += 1; 129 total_size += nm->size(); 130 relocation_size += nm->relocation_size(); 131 consts_size += nm->consts_size(); 132 insts_size += nm->insts_size(); 133 stub_size += nm->stub_size(); 134 oops_size += nm->oops_size(); 135 metadata_size += nm->metadata_size(); 136 scopes_data_size += nm->scopes_data_size(); 137 scopes_pcs_size += nm->scopes_pcs_size(); 138 dependencies_size += nm->dependencies_size(); 139 handler_table_size += nm->handler_table_size(); 140 nul_chk_table_size += nm->nul_chk_table_size(); 141 #if INCLUDE_JVMCI 142 speculations_size += nm->speculations_size(); 143 jvmci_data_size += nm->jvmci_data_size(); 144 #endif 145 } 146 void print_nmethod_stats(const char* name) { 147 if (nmethod_count == 0) return; 148 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 149 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 150 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 151 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 152 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 153 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 154 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 155 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 156 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 157 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 158 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 159 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 160 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 161 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 162 #if INCLUDE_JVMCI 163 if (speculations_size != 0) tty->print_cr(" speculations = %d", speculations_size); 164 if (jvmci_data_size != 0) tty->print_cr(" JVMCI data = %d", jvmci_data_size); 165 #endif 166 } 167 }; 168 169 struct native_nmethod_stats_struct { 170 int native_nmethod_count; 171 int native_total_size; 172 int native_relocation_size; 173 int native_insts_size; 174 int native_oops_size; 175 int native_metadata_size; 176 void note_native_nmethod(nmethod* nm) { 177 native_nmethod_count += 1; 178 native_total_size += nm->size(); 179 native_relocation_size += nm->relocation_size(); 180 native_insts_size += nm->insts_size(); 181 native_oops_size += nm->oops_size(); 182 native_metadata_size += nm->metadata_size(); 183 } 184 void print_native_nmethod_stats() { 185 if (native_nmethod_count == 0) return; 186 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 187 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 188 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 189 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 190 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 191 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 192 } 193 }; 194 195 struct pc_nmethod_stats_struct { 196 int pc_desc_resets; // number of resets (= number of caches) 197 int pc_desc_queries; // queries to nmethod::find_pc_desc 198 int pc_desc_approx; // number of those which have approximate true 199 int pc_desc_repeats; // number of _pc_descs[0] hits 200 int pc_desc_hits; // number of LRU cache hits 201 int pc_desc_tests; // total number of PcDesc examinations 202 int pc_desc_searches; // total number of quasi-binary search steps 203 int pc_desc_adds; // number of LUR cache insertions 204 205 void print_pc_stats() { 206 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 207 pc_desc_queries, 208 (double)(pc_desc_tests + pc_desc_searches) 209 / pc_desc_queries); 210 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 211 pc_desc_resets, 212 pc_desc_queries, pc_desc_approx, 213 pc_desc_repeats, pc_desc_hits, 214 pc_desc_tests, pc_desc_searches, pc_desc_adds); 215 } 216 }; 217 218 #ifdef COMPILER1 219 static java_nmethod_stats_struct c1_java_nmethod_stats; 220 #endif 221 #ifdef COMPILER2 222 static java_nmethod_stats_struct c2_java_nmethod_stats; 223 #endif 224 #if INCLUDE_JVMCI 225 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 226 #endif 227 static java_nmethod_stats_struct unknown_java_nmethod_stats; 228 229 static native_nmethod_stats_struct native_nmethod_stats; 230 static pc_nmethod_stats_struct pc_nmethod_stats; 231 232 static void note_java_nmethod(nmethod* nm) { 233 #ifdef COMPILER1 234 if (nm->is_compiled_by_c1()) { 235 c1_java_nmethod_stats.note_nmethod(nm); 236 } else 237 #endif 238 #ifdef COMPILER2 239 if (nm->is_compiled_by_c2()) { 240 c2_java_nmethod_stats.note_nmethod(nm); 241 } else 242 #endif 243 #if INCLUDE_JVMCI 244 if (nm->is_compiled_by_jvmci()) { 245 jvmci_java_nmethod_stats.note_nmethod(nm); 246 } else 247 #endif 248 { 249 unknown_java_nmethod_stats.note_nmethod(nm); 250 } 251 } 252 #endif // !PRODUCT 253 254 //--------------------------------------------------------------------------------- 255 256 257 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 258 assert(pc != NULL, "Must be non null"); 259 assert(exception.not_null(), "Must be non null"); 260 assert(handler != NULL, "Must be non null"); 261 262 _count = 0; 263 _exception_type = exception->klass(); 264 _next = NULL; 265 _purge_list_next = NULL; 266 267 add_address_and_handler(pc,handler); 268 } 269 270 271 address ExceptionCache::match(Handle exception, address pc) { 272 assert(pc != NULL,"Must be non null"); 273 assert(exception.not_null(),"Must be non null"); 274 if (exception->klass() == exception_type()) { 275 return (test_address(pc)); 276 } 277 278 return NULL; 279 } 280 281 282 bool ExceptionCache::match_exception_with_space(Handle exception) { 283 assert(exception.not_null(),"Must be non null"); 284 if (exception->klass() == exception_type() && count() < cache_size) { 285 return true; 286 } 287 return false; 288 } 289 290 291 address ExceptionCache::test_address(address addr) { 292 int limit = count(); 293 for (int i = 0; i < limit; i++) { 294 if (pc_at(i) == addr) { 295 return handler_at(i); 296 } 297 } 298 return NULL; 299 } 300 301 302 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 303 if (test_address(addr) == handler) return true; 304 305 int index = count(); 306 if (index < cache_size) { 307 set_pc_at(index, addr); 308 set_handler_at(index, handler); 309 increment_count(); 310 return true; 311 } 312 return false; 313 } 314 315 ExceptionCache* ExceptionCache::next() { 316 return Atomic::load(&_next); 317 } 318 319 void ExceptionCache::set_next(ExceptionCache *ec) { 320 Atomic::store(&_next, ec); 321 } 322 323 //----------------------------------------------------------------------------- 324 325 326 // Helper used by both find_pc_desc methods. 327 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 328 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 329 if (!approximate) 330 return pc->pc_offset() == pc_offset; 331 else 332 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 333 } 334 335 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 336 if (initial_pc_desc == NULL) { 337 _pc_descs[0] = NULL; // native method; no PcDescs at all 338 return; 339 } 340 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 341 // reset the cache by filling it with benign (non-null) values 342 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 343 for (int i = 0; i < cache_size; i++) 344 _pc_descs[i] = initial_pc_desc; 345 } 346 347 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 349 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 350 351 // Note: one might think that caching the most recently 352 // read value separately would be a win, but one would be 353 // wrong. When many threads are updating it, the cache 354 // line it's in would bounce between caches, negating 355 // any benefit. 356 357 // In order to prevent race conditions do not load cache elements 358 // repeatedly, but use a local copy: 359 PcDesc* res; 360 361 // Step one: Check the most recently added value. 362 res = _pc_descs[0]; 363 if (res == NULL) return NULL; // native method; no PcDescs at all 364 if (match_desc(res, pc_offset, approximate)) { 365 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 366 return res; 367 } 368 369 // Step two: Check the rest of the LRU cache. 370 for (int i = 1; i < cache_size; ++i) { 371 res = _pc_descs[i]; 372 if (res->pc_offset() < 0) break; // optimization: skip empty cache 373 if (match_desc(res, pc_offset, approximate)) { 374 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 375 return res; 376 } 377 } 378 379 // Report failure. 380 return NULL; 381 } 382 383 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 384 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 385 // Update the LRU cache by shifting pc_desc forward. 386 for (int i = 0; i < cache_size; i++) { 387 PcDesc* next = _pc_descs[i]; 388 _pc_descs[i] = pc_desc; 389 pc_desc = next; 390 } 391 } 392 393 // adjust pcs_size so that it is a multiple of both oopSize and 394 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 395 // of oopSize, then 2*sizeof(PcDesc) is) 396 static int adjust_pcs_size(int pcs_size) { 397 int nsize = align_up(pcs_size, oopSize); 398 if ((nsize % sizeof(PcDesc)) != 0) { 399 nsize = pcs_size + sizeof(PcDesc); 400 } 401 assert((nsize % oopSize) == 0, "correct alignment"); 402 return nsize; 403 } 404 405 406 int nmethod::total_size() const { 407 return 408 consts_size() + 409 insts_size() + 410 stub_size() + 411 scopes_data_size() + 412 scopes_pcs_size() + 413 handler_table_size() + 414 nul_chk_table_size(); 415 } 416 417 address* nmethod::orig_pc_addr(const frame* fr) { 418 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); 419 } 420 421 const char* nmethod::compile_kind() const { 422 if (is_osr_method()) return "osr"; 423 if (method() != NULL && is_native_method()) return "c2n"; 424 return NULL; 425 } 426 427 // Fill in default values for various flag fields 428 void nmethod::init_defaults() { 429 _state = not_installed; 430 _has_flushed_dependencies = 0; 431 _lock_count = 0; 432 _stack_traversal_mark = 0; 433 _load_reported = false; // jvmti state 434 _unload_reported = false; 435 _is_far_code = false; // nmethods are located in CodeCache 436 437 #ifdef ASSERT 438 _oops_are_stale = false; 439 #endif 440 441 _oops_do_mark_link = NULL; 442 _osr_link = NULL; 443 #if INCLUDE_RTM_OPT 444 _rtm_state = NoRTM; 445 #endif 446 } 447 448 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 449 int compile_id, 450 CodeBuffer *code_buffer, 451 int vep_offset, 452 int frame_complete, 453 int frame_size, 454 ByteSize basic_lock_owner_sp_offset, 455 ByteSize basic_lock_sp_offset, 456 OopMapSet* oop_maps) { 457 code_buffer->finalize_oop_references(method); 458 // create nmethod 459 nmethod* nm = NULL; 460 { 461 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 462 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 463 464 CodeOffsets offsets; 465 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 466 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 467 nm = new (native_nmethod_size, CompLevel_none) 468 nmethod(method(), compiler_none, native_nmethod_size, 469 compile_id, &offsets, 470 code_buffer, frame_size, 471 basic_lock_owner_sp_offset, 472 basic_lock_sp_offset, 473 oop_maps); 474 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 475 } 476 477 if (nm != NULL) { 478 // verify nmethod 479 debug_only(nm->verify();) // might block 480 481 nm->log_new_nmethod(); 482 } 483 return nm; 484 } 485 486 nmethod* nmethod::new_nmethod(const methodHandle& method, 487 int compile_id, 488 int entry_bci, 489 CodeOffsets* offsets, 490 int orig_pc_offset, 491 DebugInformationRecorder* debug_info, 492 Dependencies* dependencies, 493 CodeBuffer* code_buffer, int frame_size, 494 OopMapSet* oop_maps, 495 ExceptionHandlerTable* handler_table, 496 ImplicitExceptionTable* nul_chk_table, 497 AbstractCompiler* compiler, 498 int comp_level 499 #if INCLUDE_JVMCI 500 , char* speculations, 501 int speculations_len, 502 int nmethod_mirror_index, 503 const char* nmethod_mirror_name, 504 FailedSpeculation** failed_speculations 505 #endif 506 ) 507 { 508 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 509 code_buffer->finalize_oop_references(method); 510 // create nmethod 511 nmethod* nm = NULL; 512 { MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 513 #if INCLUDE_JVMCI 514 int jvmci_data_size = !compiler->is_jvmci() ? 0 : JVMCINMethodData::compute_size(nmethod_mirror_name); 515 #endif 516 int nmethod_size = 517 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 518 + adjust_pcs_size(debug_info->pcs_size()) 519 + align_up((int)dependencies->size_in_bytes(), oopSize) 520 + align_up(handler_table->size_in_bytes() , oopSize) 521 + align_up(nul_chk_table->size_in_bytes() , oopSize) 522 #if INCLUDE_JVMCI 523 + align_up(speculations_len , oopSize) 524 + align_up(jvmci_data_size , oopSize) 525 #endif 526 + align_up(debug_info->data_size() , oopSize); 527 528 nm = new (nmethod_size, comp_level) 529 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 530 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 531 oop_maps, 532 handler_table, 533 nul_chk_table, 534 compiler, 535 comp_level 536 #if INCLUDE_JVMCI 537 , speculations, 538 speculations_len, 539 jvmci_data_size 540 #endif 541 ); 542 543 if (nm != NULL) { 544 #if INCLUDE_JVMCI 545 if (compiler->is_jvmci()) { 546 // Initialize the JVMCINMethodData object inlined into nm 547 nm->jvmci_nmethod_data()->initialize(nmethod_mirror_index, nmethod_mirror_name, failed_speculations); 548 } 549 #endif 550 // To make dependency checking during class loading fast, record 551 // the nmethod dependencies in the classes it is dependent on. 552 // This allows the dependency checking code to simply walk the 553 // class hierarchy above the loaded class, checking only nmethods 554 // which are dependent on those classes. The slow way is to 555 // check every nmethod for dependencies which makes it linear in 556 // the number of methods compiled. For applications with a lot 557 // classes the slow way is too slow. 558 for (Dependencies::DepStream deps(nm); deps.next(); ) { 559 if (deps.type() == Dependencies::call_site_target_value) { 560 // CallSite dependencies are managed on per-CallSite instance basis. 561 oop call_site = deps.argument_oop(0); 562 MethodHandles::add_dependent_nmethod(call_site, nm); 563 } else { 564 Klass* klass = deps.context_type(); 565 if (klass == NULL) { 566 continue; // ignore things like evol_method 567 } 568 // record this nmethod as dependent on this klass 569 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 570 } 571 } 572 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 573 } 574 } 575 // Do verification and logging outside CodeCache_lock. 576 if (nm != NULL) { 577 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 578 DEBUG_ONLY(nm->verify();) 579 nm->log_new_nmethod(); 580 } 581 return nm; 582 } 583 584 // For native wrappers 585 nmethod::nmethod( 586 Method* method, 587 CompilerType type, 588 int nmethod_size, 589 int compile_id, 590 CodeOffsets* offsets, 591 CodeBuffer* code_buffer, 592 int frame_size, 593 ByteSize basic_lock_owner_sp_offset, 594 ByteSize basic_lock_sp_offset, 595 OopMapSet* oop_maps ) 596 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 597 _is_unloading_state(0), 598 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 599 _native_basic_lock_sp_offset(basic_lock_sp_offset) 600 { 601 { 602 int scopes_data_offset = 0; 603 int deoptimize_offset = 0; 604 int deoptimize_mh_offset = 0; 605 606 debug_only(NoSafepointVerifier nsv;) 607 assert_locked_or_safepoint(CodeCache_lock); 608 609 init_defaults(); 610 _entry_bci = InvocationEntryBci; 611 // We have no exception handler or deopt handler make the 612 // values something that will never match a pc like the nmethod vtable entry 613 _exception_offset = 0; 614 _orig_pc_offset = 0; 615 616 _consts_offset = data_offset(); 617 _stub_offset = data_offset(); 618 _oops_offset = data_offset(); 619 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 620 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 621 _scopes_pcs_offset = scopes_data_offset; 622 _dependencies_offset = _scopes_pcs_offset; 623 _handler_table_offset = _dependencies_offset; 624 _nul_chk_table_offset = _handler_table_offset; 625 #if INCLUDE_JVMCI 626 _speculations_offset = _nul_chk_table_offset; 627 _jvmci_data_offset = _speculations_offset; 628 _nmethod_end_offset = _jvmci_data_offset; 629 #else 630 _nmethod_end_offset = _nul_chk_table_offset; 631 #endif 632 _compile_id = compile_id; 633 _comp_level = CompLevel_none; 634 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 635 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 636 _osr_entry_point = NULL; 637 _exception_cache = NULL; 638 _pc_desc_container.reset_to(NULL); 639 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 640 641 _scopes_data_begin = (address) this + scopes_data_offset; 642 _deopt_handler_begin = (address) this + deoptimize_offset; 643 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 644 645 code_buffer->copy_code_and_locs_to(this); 646 code_buffer->copy_values_to(this); 647 648 clear_unloading_state(); 649 650 Universe::heap()->register_nmethod(this); 651 debug_only(Universe::heap()->verify_nmethod(this)); 652 653 CodeCache::commit(this); 654 } 655 656 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 657 ttyLocker ttyl; // keep the following output all in one block 658 // This output goes directly to the tty, not the compiler log. 659 // To enable tools to match it up with the compilation activity, 660 // be sure to tag this tty output with the compile ID. 661 if (xtty != NULL) { 662 xtty->begin_head("print_native_nmethod"); 663 xtty->method(_method); 664 xtty->stamp(); 665 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 666 } 667 // Print the header part, then print the requested information. 668 // This is both handled in decode2(), called via print_code() -> decode() 669 if (PrintNativeNMethods) { 670 tty->print_cr("-------------------------- Assembly (native nmethod) ---------------------------"); 671 print_code(); 672 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 673 #if defined(SUPPORT_DATA_STRUCTS) 674 if (AbstractDisassembler::show_structs()) { 675 if (oop_maps != NULL) { 676 tty->print("oop maps:"); // oop_maps->print_on(tty) outputs a cr() at the beginning 677 oop_maps->print_on(tty); 678 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 679 } 680 } 681 #endif 682 } else { 683 print(); // print the header part only. 684 } 685 #if defined(SUPPORT_DATA_STRUCTS) 686 if (AbstractDisassembler::show_structs()) { 687 if (PrintRelocations) { 688 print_relocations(); 689 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 690 } 691 } 692 #endif 693 if (xtty != NULL) { 694 xtty->tail("print_native_nmethod"); 695 } 696 } 697 } 698 699 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 700 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 701 } 702 703 nmethod::nmethod( 704 Method* method, 705 CompilerType type, 706 int nmethod_size, 707 int compile_id, 708 int entry_bci, 709 CodeOffsets* offsets, 710 int orig_pc_offset, 711 DebugInformationRecorder* debug_info, 712 Dependencies* dependencies, 713 CodeBuffer *code_buffer, 714 int frame_size, 715 OopMapSet* oop_maps, 716 ExceptionHandlerTable* handler_table, 717 ImplicitExceptionTable* nul_chk_table, 718 AbstractCompiler* compiler, 719 int comp_level 720 #if INCLUDE_JVMCI 721 , char* speculations, 722 int speculations_len, 723 int jvmci_data_size 724 #endif 725 ) 726 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 727 _is_unloading_state(0), 728 _native_receiver_sp_offset(in_ByteSize(-1)), 729 _native_basic_lock_sp_offset(in_ByteSize(-1)) 730 { 731 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 732 { 733 debug_only(NoSafepointVerifier nsv;) 734 assert_locked_or_safepoint(CodeCache_lock); 735 736 _deopt_handler_begin = (address) this; 737 _deopt_mh_handler_begin = (address) this; 738 739 init_defaults(); 740 _entry_bci = entry_bci; 741 _compile_id = compile_id; 742 _comp_level = comp_level; 743 _orig_pc_offset = orig_pc_offset; 744 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 745 746 // Section offsets 747 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 748 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 749 set_ctable_begin(header_begin() + _consts_offset); 750 751 #if INCLUDE_JVMCI 752 if (compiler->is_jvmci()) { 753 // JVMCI might not produce any stub sections 754 if (offsets->value(CodeOffsets::Exceptions) != -1) { 755 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 756 } else { 757 _exception_offset = -1; 758 } 759 if (offsets->value(CodeOffsets::Deopt) != -1) { 760 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 761 } else { 762 _deopt_handler_begin = NULL; 763 } 764 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 765 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 766 } else { 767 _deopt_mh_handler_begin = NULL; 768 } 769 } else 770 #endif 771 { 772 // Exception handler and deopt handler are in the stub section 773 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 774 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 775 776 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 777 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 778 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 779 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 780 } else { 781 _deopt_mh_handler_begin = NULL; 782 } 783 } 784 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 785 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 786 } else { 787 _unwind_handler_offset = -1; 788 } 789 790 _oops_offset = data_offset(); 791 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 792 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 793 794 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 795 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 796 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 797 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 798 #if INCLUDE_JVMCI 799 _speculations_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 800 _jvmci_data_offset = _speculations_offset + align_up(speculations_len, oopSize); 801 _nmethod_end_offset = _jvmci_data_offset + align_up(jvmci_data_size, oopSize); 802 #else 803 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 804 #endif 805 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 806 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 807 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 808 _exception_cache = NULL; 809 _scopes_data_begin = (address) this + scopes_data_offset; 810 811 _pc_desc_container.reset_to(scopes_pcs_begin()); 812 813 code_buffer->copy_code_and_locs_to(this); 814 // Copy contents of ScopeDescRecorder to nmethod 815 code_buffer->copy_values_to(this); 816 debug_info->copy_to(this); 817 dependencies->copy_to(this); 818 clear_unloading_state(); 819 820 Universe::heap()->register_nmethod(this); 821 debug_only(Universe::heap()->verify_nmethod(this)); 822 823 CodeCache::commit(this); 824 825 // Copy contents of ExceptionHandlerTable to nmethod 826 handler_table->copy_to(this); 827 nul_chk_table->copy_to(this); 828 829 #if INCLUDE_JVMCI 830 // Copy speculations to nmethod 831 if (speculations_size() != 0) { 832 memcpy(speculations_begin(), speculations, speculations_len); 833 } 834 #endif 835 836 // we use the information of entry points to find out if a method is 837 // static or non static 838 assert(compiler->is_c2() || compiler->is_jvmci() || 839 _method->is_static() == (entry_point() == _verified_entry_point), 840 " entry points must be same for static methods and vice versa"); 841 } 842 } 843 844 // Print a short set of xml attributes to identify this nmethod. The 845 // output should be embedded in some other element. 846 void nmethod::log_identity(xmlStream* log) const { 847 log->print(" compile_id='%d'", compile_id()); 848 const char* nm_kind = compile_kind(); 849 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 850 log->print(" compiler='%s'", compiler_name()); 851 if (TieredCompilation) { 852 log->print(" level='%d'", comp_level()); 853 } 854 #if INCLUDE_JVMCI 855 if (jvmci_nmethod_data() != NULL) { 856 const char* jvmci_name = jvmci_nmethod_data()->name(); 857 if (jvmci_name != NULL) { 858 log->print(" jvmci_mirror_name='"); 859 log->text("%s", jvmci_name); 860 log->print("'"); 861 } 862 } 863 #endif 864 } 865 866 867 #define LOG_OFFSET(log, name) \ 868 if (p2i(name##_end()) - p2i(name##_begin())) \ 869 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 870 p2i(name##_begin()) - p2i(this)) 871 872 873 void nmethod::log_new_nmethod() const { 874 if (LogCompilation && xtty != NULL) { 875 ttyLocker ttyl; 876 HandleMark hm; 877 xtty->begin_elem("nmethod"); 878 log_identity(xtty); 879 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 880 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 881 882 LOG_OFFSET(xtty, relocation); 883 LOG_OFFSET(xtty, consts); 884 LOG_OFFSET(xtty, insts); 885 LOG_OFFSET(xtty, stub); 886 LOG_OFFSET(xtty, scopes_data); 887 LOG_OFFSET(xtty, scopes_pcs); 888 LOG_OFFSET(xtty, dependencies); 889 LOG_OFFSET(xtty, handler_table); 890 LOG_OFFSET(xtty, nul_chk_table); 891 LOG_OFFSET(xtty, oops); 892 LOG_OFFSET(xtty, metadata); 893 894 xtty->method(method()); 895 xtty->stamp(); 896 xtty->end_elem(); 897 } 898 } 899 900 #undef LOG_OFFSET 901 902 903 // Print out more verbose output usually for a newly created nmethod. 904 void nmethod::print_on(outputStream* st, const char* msg) const { 905 if (st != NULL) { 906 ttyLocker ttyl; 907 if (WizardMode) { 908 CompileTask::print(st, this, msg, /*short_form:*/ true); 909 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 910 } else { 911 CompileTask::print(st, this, msg, /*short_form:*/ false); 912 } 913 } 914 } 915 916 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 917 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 918 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 919 print_nmethod(printnmethods); 920 } 921 } 922 923 void nmethod::print_nmethod(bool printmethod) { 924 ttyLocker ttyl; // keep the following output all in one block 925 if (xtty != NULL) { 926 xtty->begin_head("print_nmethod"); 927 log_identity(xtty); 928 xtty->stamp(); 929 xtty->end_head(); 930 } 931 // Print the header part, then print the requested information. 932 // This is both handled in decode2(). 933 if (printmethod) { 934 HandleMark hm; 935 ResourceMark m; 936 if (is_compiled_by_c1()) { 937 tty->cr(); 938 tty->print_cr("============================= C1-compiled nmethod =============================="); 939 } 940 if (is_compiled_by_jvmci()) { 941 tty->cr(); 942 tty->print_cr("=========================== JVMCI-compiled nmethod ============================="); 943 } 944 tty->print_cr("----------------------------------- Assembly -----------------------------------"); 945 decode2(tty); 946 #if defined(SUPPORT_DATA_STRUCTS) 947 if (AbstractDisassembler::show_structs()) { 948 // Print the oops from the underlying CodeBlob as well. 949 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 950 print_oops(tty); 951 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 952 print_metadata(tty); 953 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 954 print_pcs(); 955 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 956 if (oop_maps() != NULL) { 957 tty->print("oop maps:"); // oop_maps()->print_on(tty) outputs a cr() at the beginning 958 oop_maps()->print_on(tty); 959 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 960 } 961 } 962 #endif 963 } else { 964 print(); // print the header part only. 965 } 966 967 #if defined(SUPPORT_DATA_STRUCTS) 968 if (AbstractDisassembler::show_structs()) { 969 methodHandle mh(Thread::current(), _method); 970 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(mh, "PrintDebugInfo")) { 971 print_scopes(); 972 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 973 } 974 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(mh, "PrintRelocations")) { 975 print_relocations(); 976 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 977 } 978 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(mh, "PrintDependencies")) { 979 print_dependencies(); 980 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 981 } 982 if (printmethod || PrintExceptionHandlers) { 983 print_handler_table(); 984 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 985 print_nul_chk_table(); 986 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 987 } 988 989 if (printmethod) { 990 print_recorded_oops(); 991 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 992 print_recorded_metadata(); 993 tty->print_cr("- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "); 994 } 995 } 996 #endif 997 998 if (xtty != NULL) { 999 xtty->tail("print_nmethod"); 1000 } 1001 } 1002 1003 1004 // Promote one word from an assembly-time handle to a live embedded oop. 1005 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1006 if (handle == NULL || 1007 // As a special case, IC oops are initialized to 1 or -1. 1008 handle == (jobject) Universe::non_oop_word()) { 1009 (*dest) = (oop) handle; 1010 } else { 1011 (*dest) = JNIHandles::resolve_non_null(handle); 1012 } 1013 } 1014 1015 1016 // Have to have the same name because it's called by a template 1017 void nmethod::copy_values(GrowableArray<jobject>* array) { 1018 int length = array->length(); 1019 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1020 oop* dest = oops_begin(); 1021 for (int index = 0 ; index < length; index++) { 1022 initialize_immediate_oop(&dest[index], array->at(index)); 1023 } 1024 1025 // Now we can fix up all the oops in the code. We need to do this 1026 // in the code because the assembler uses jobjects as placeholders. 1027 // The code and relocations have already been initialized by the 1028 // CodeBlob constructor, so it is valid even at this early point to 1029 // iterate over relocations and patch the code. 1030 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1031 } 1032 1033 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1034 int length = array->length(); 1035 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1036 Metadata** dest = metadata_begin(); 1037 for (int index = 0 ; index < length; index++) { 1038 dest[index] = array->at(index); 1039 } 1040 } 1041 1042 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1043 // re-patch all oop-bearing instructions, just in case some oops moved 1044 RelocIterator iter(this, begin, end); 1045 while (iter.next()) { 1046 if (iter.type() == relocInfo::oop_type) { 1047 oop_Relocation* reloc = iter.oop_reloc(); 1048 if (initialize_immediates && reloc->oop_is_immediate()) { 1049 oop* dest = reloc->oop_addr(); 1050 initialize_immediate_oop(dest, cast_from_oop<jobject>(*dest)); 1051 } 1052 // Refresh the oop-related bits of this instruction. 1053 reloc->fix_oop_relocation(); 1054 } else if (iter.type() == relocInfo::metadata_type) { 1055 metadata_Relocation* reloc = iter.metadata_reloc(); 1056 reloc->fix_metadata_relocation(); 1057 } 1058 } 1059 } 1060 1061 1062 void nmethod::verify_clean_inline_caches() { 1063 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 1064 1065 ResourceMark rm; 1066 RelocIterator iter(this, oops_reloc_begin()); 1067 while(iter.next()) { 1068 switch(iter.type()) { 1069 case relocInfo::virtual_call_type: 1070 case relocInfo::opt_virtual_call_type: { 1071 CompiledIC *ic = CompiledIC_at(&iter); 1072 // Ok, to lookup references to zombies here 1073 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1074 assert(cb != NULL, "destination not in CodeBlob?"); 1075 nmethod* nm = cb->as_nmethod_or_null(); 1076 if( nm != NULL ) { 1077 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1078 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1079 assert(ic->is_clean(), "IC should be clean"); 1080 } 1081 } 1082 break; 1083 } 1084 case relocInfo::static_call_type: { 1085 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1086 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1087 assert(cb != NULL, "destination not in CodeBlob?"); 1088 nmethod* nm = cb->as_nmethod_or_null(); 1089 if( nm != NULL ) { 1090 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1091 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1092 assert(csc->is_clean(), "IC should be clean"); 1093 } 1094 } 1095 break; 1096 } 1097 default: 1098 break; 1099 } 1100 } 1101 } 1102 1103 // This is a private interface with the sweeper. 1104 void nmethod::mark_as_seen_on_stack() { 1105 assert(is_alive(), "Must be an alive method"); 1106 // Set the traversal mark to ensure that the sweeper does 2 1107 // cleaning passes before moving to zombie. 1108 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1109 } 1110 1111 // Tell if a non-entrant method can be converted to a zombie (i.e., 1112 // there are no activations on the stack, not in use by the VM, 1113 // and not in use by the ServiceThread) 1114 bool nmethod::can_convert_to_zombie() { 1115 // Note that this is called when the sweeper has observed the nmethod to be 1116 // not_entrant. However, with concurrent code cache unloading, the state 1117 // might have moved on to unloaded if it is_unloading(), due to racing 1118 // concurrent GC threads. 1119 assert(is_not_entrant() || is_unloading() || 1120 !Thread::current()->is_Code_cache_sweeper_thread(), 1121 "must be a non-entrant method if called from sweeper"); 1122 1123 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1124 // count can be greater than the stack traversal count before it hits the 1125 // nmethod for the second time. 1126 // If an is_unloading() nmethod is still not_entrant, then it is not safe to 1127 // convert it to zombie due to GC unloading interactions. However, if it 1128 // has become unloaded, then it is okay to convert such nmethods to zombie. 1129 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() && 1130 !is_locked_by_vm() && (!is_unloading() || is_unloaded()); 1131 } 1132 1133 void nmethod::inc_decompile_count() { 1134 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1135 // Could be gated by ProfileTraps, but do not bother... 1136 Method* m = method(); 1137 if (m == NULL) return; 1138 MethodData* mdo = m->method_data(); 1139 if (mdo == NULL) return; 1140 // There is a benign race here. See comments in methodData.hpp. 1141 mdo->inc_decompile_count(); 1142 } 1143 1144 bool nmethod::try_transition(int new_state_int) { 1145 signed char new_state = new_state_int; 1146 #ifdef DEBUG 1147 if (new_state != unloaded) { 1148 assert_lock_strong(CompiledMethod_lock); 1149 } 1150 #endif 1151 for (;;) { 1152 signed char old_state = Atomic::load(&_state); 1153 if (old_state >= new_state) { 1154 // Ensure monotonicity of transitions. 1155 return false; 1156 } 1157 if (Atomic::cmpxchg(&_state, old_state, new_state) == old_state) { 1158 return true; 1159 } 1160 } 1161 } 1162 1163 void nmethod::make_unloaded() { 1164 post_compiled_method_unload(); 1165 1166 // This nmethod is being unloaded, make sure that dependencies 1167 // recorded in instanceKlasses get flushed. 1168 // Since this work is being done during a GC, defer deleting dependencies from the 1169 // InstanceKlass. 1170 assert(Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread(), 1171 "should only be called during gc"); 1172 flush_dependencies(/*delete_immediately*/false); 1173 1174 // Break cycle between nmethod & method 1175 LogTarget(Trace, class, unload, nmethod) lt; 1176 if (lt.is_enabled()) { 1177 LogStream ls(lt); 1178 ls.print("making nmethod " INTPTR_FORMAT 1179 " unloadable, Method*(" INTPTR_FORMAT 1180 ") ", 1181 p2i(this), p2i(_method)); 1182 ls.cr(); 1183 } 1184 // Unlink the osr method, so we do not look this up again 1185 if (is_osr_method()) { 1186 // Invalidate the osr nmethod only once. Note that with concurrent 1187 // code cache unloading, OSR nmethods are invalidated before they 1188 // are made unloaded. Therefore, this becomes a no-op then. 1189 if (is_in_use()) { 1190 invalidate_osr_method(); 1191 } 1192 #ifdef ASSERT 1193 if (method() != NULL) { 1194 // Make sure osr nmethod is invalidated, i.e. not on the list 1195 bool found = method()->method_holder()->remove_osr_nmethod(this); 1196 assert(!found, "osr nmethod should have been invalidated"); 1197 } 1198 #endif 1199 } 1200 1201 // If _method is already NULL the Method* is about to be unloaded, 1202 // so we don't have to break the cycle. Note that it is possible to 1203 // have the Method* live here, in case we unload the nmethod because 1204 // it is pointing to some oop (other than the Method*) being unloaded. 1205 if (_method != NULL) { 1206 _method->unlink_code(this); 1207 } 1208 1209 // Make the class unloaded - i.e., change state and notify sweeper 1210 assert(SafepointSynchronize::is_at_safepoint() || Thread::current()->is_ConcurrentGC_thread(), 1211 "must be at safepoint"); 1212 1213 { 1214 // Clear ICStubs and release any CompiledICHolders. 1215 CompiledICLocker ml(this); 1216 clear_ic_callsites(); 1217 } 1218 1219 // Unregister must be done before the state change 1220 { 1221 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : CodeCache_lock, 1222 Mutex::_no_safepoint_check_flag); 1223 Universe::heap()->unregister_nmethod(this); 1224 } 1225 1226 // Clear the method of this dead nmethod 1227 set_method(NULL); 1228 1229 // Log the unloading. 1230 log_state_change(); 1231 1232 // The Method* is gone at this point 1233 assert(_method == NULL, "Tautology"); 1234 1235 set_osr_link(NULL); 1236 NMethodSweeper::report_state_change(this); 1237 1238 bool transition_success = try_transition(unloaded); 1239 1240 // It is an important invariant that there exists no race between 1241 // the sweeper and GC thread competing for making the same nmethod 1242 // zombie and unloaded respectively. This is ensured by 1243 // can_convert_to_zombie() returning false for any is_unloading() 1244 // nmethod, informing the sweeper not to step on any GC toes. 1245 assert(transition_success, "Invalid nmethod transition to unloaded"); 1246 1247 #if INCLUDE_JVMCI 1248 // Clear the link between this nmethod and a HotSpotNmethod mirror 1249 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1250 if (nmethod_data != NULL) { 1251 nmethod_data->invalidate_nmethod_mirror(this); 1252 nmethod_data->clear_nmethod_mirror(this); 1253 } 1254 #endif 1255 } 1256 1257 void nmethod::invalidate_osr_method() { 1258 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1259 // Remove from list of active nmethods 1260 if (method() != NULL) { 1261 method()->method_holder()->remove_osr_nmethod(this); 1262 } 1263 } 1264 1265 void nmethod::log_state_change() const { 1266 if (LogCompilation) { 1267 if (xtty != NULL) { 1268 ttyLocker ttyl; // keep the following output all in one block 1269 if (_state == unloaded) { 1270 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1271 os::current_thread_id()); 1272 } else { 1273 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1274 os::current_thread_id(), 1275 (_state == zombie ? " zombie='1'" : "")); 1276 } 1277 log_identity(xtty); 1278 xtty->stamp(); 1279 xtty->end_elem(); 1280 } 1281 } 1282 1283 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1284 CompileTask::print_ul(this, state_msg); 1285 if (PrintCompilation && _state != unloaded) { 1286 print_on(tty, state_msg); 1287 } 1288 } 1289 1290 void nmethod::unlink_from_method() { 1291 if (method() != NULL) { 1292 method()->unlink_code(this); 1293 } 1294 } 1295 1296 /** 1297 * Common functionality for both make_not_entrant and make_zombie 1298 */ 1299 bool nmethod::make_not_entrant_or_zombie(int state) { 1300 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1301 1302 if (Atomic::load(&_state) >= state) { 1303 // Avoid taking the lock if already in required state. 1304 // This is safe from races because the state is an end-state, 1305 // which the nmethod cannot back out of once entered. 1306 // No need for fencing either. 1307 return false; 1308 } 1309 1310 // Make sure the nmethod is not flushed. 1311 nmethodLocker nml(this); 1312 // This can be called while the system is already at a safepoint which is ok 1313 NoSafepointVerifier nsv; 1314 1315 // during patching, depending on the nmethod state we must notify the GC that 1316 // code has been unloaded, unregistering it. We cannot do this right while 1317 // holding the CompiledMethod_lock because we need to use the CodeCache_lock. This 1318 // would be prone to deadlocks. 1319 // This flag is used to remember whether we need to later lock and unregister. 1320 bool nmethod_needs_unregister = false; 1321 1322 { 1323 // Enter critical section. Does not block for safepoint. 1324 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock, Mutex::_no_safepoint_check_flag); 1325 1326 // This logic is equivalent to the logic below for patching the 1327 // verified entry point of regular methods. We check that the 1328 // nmethod is in use to ensure that it is invalidated only once. 1329 if (is_osr_method() && is_in_use()) { 1330 // this effectively makes the osr nmethod not entrant 1331 invalidate_osr_method(); 1332 } 1333 1334 if (Atomic::load(&_state) >= state) { 1335 // another thread already performed this transition so nothing 1336 // to do, but return false to indicate this. 1337 return false; 1338 } 1339 1340 // The caller can be calling the method statically or through an inline 1341 // cache call. 1342 if (!is_osr_method() && !is_not_entrant()) { 1343 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1344 SharedRuntime::get_handle_wrong_method_stub()); 1345 } 1346 1347 if (is_in_use() && update_recompile_counts()) { 1348 // It's a true state change, so mark the method as decompiled. 1349 // Do it only for transition from alive. 1350 inc_decompile_count(); 1351 } 1352 1353 // If the state is becoming a zombie, signal to unregister the nmethod with 1354 // the heap. 1355 // This nmethod may have already been unloaded during a full GC. 1356 if ((state == zombie) && !is_unloaded()) { 1357 nmethod_needs_unregister = true; 1358 } 1359 1360 // Must happen before state change. Otherwise we have a race condition in 1361 // nmethod::can_convert_to_zombie(). I.e., a method can immediately 1362 // transition its state from 'not_entrant' to 'zombie' without having to wait 1363 // for stack scanning. 1364 if (state == not_entrant) { 1365 mark_as_seen_on_stack(); 1366 OrderAccess::storestore(); // _stack_traversal_mark and _state 1367 } 1368 1369 // Change state 1370 if (!try_transition(state)) { 1371 // If the transition fails, it is due to another thread making the nmethod more 1372 // dead. In particular, one thread might be making the nmethod unloaded concurrently. 1373 // If so, having patched in the jump in the verified entry unnecessarily is fine. 1374 // The nmethod is no longer possible to call by Java threads. 1375 // Incrementing the decompile count is also fine as the caller of make_not_entrant() 1376 // had a valid reason to deoptimize the nmethod. 1377 // Marking the nmethod as seen on stack also has no effect, as the nmethod is now 1378 // !is_alive(), and the seen on stack value is only used to convert not_entrant 1379 // nmethods to zombie in can_convert_to_zombie(). 1380 return false; 1381 } 1382 1383 // Log the transition once 1384 log_state_change(); 1385 1386 // Remove nmethod from method. 1387 unlink_from_method(); 1388 1389 } // leave critical region under CompiledMethod_lock 1390 1391 #if INCLUDE_JVMCI 1392 // Invalidate can't occur while holding the Patching lock 1393 JVMCINMethodData* nmethod_data = jvmci_nmethod_data(); 1394 if (nmethod_data != NULL) { 1395 nmethod_data->invalidate_nmethod_mirror(this); 1396 } 1397 #endif 1398 1399 #ifdef ASSERT 1400 if (is_osr_method() && method() != NULL) { 1401 // Make sure osr nmethod is invalidated, i.e. not on the list 1402 bool found = method()->method_holder()->remove_osr_nmethod(this); 1403 assert(!found, "osr nmethod should have been invalidated"); 1404 } 1405 #endif 1406 1407 // When the nmethod becomes zombie it is no longer alive so the 1408 // dependencies must be flushed. nmethods in the not_entrant 1409 // state will be flushed later when the transition to zombie 1410 // happens or they get unloaded. 1411 if (state == zombie) { 1412 { 1413 // Flushing dependencies must be done before any possible 1414 // safepoint can sneak in, otherwise the oops used by the 1415 // dependency logic could have become stale. 1416 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1417 if (nmethod_needs_unregister) { 1418 Universe::heap()->unregister_nmethod(this); 1419 } 1420 flush_dependencies(/*delete_immediately*/true); 1421 } 1422 1423 #if INCLUDE_JVMCI 1424 // Now that the nmethod has been unregistered, it's 1425 // safe to clear the HotSpotNmethod mirror oop. 1426 if (nmethod_data != NULL) { 1427 nmethod_data->clear_nmethod_mirror(this); 1428 } 1429 #endif 1430 1431 // Clear ICStubs to prevent back patching stubs of zombie or flushed 1432 // nmethods during the next safepoint (see ICStub::finalize), as well 1433 // as to free up CompiledICHolder resources. 1434 { 1435 CompiledICLocker ml(this); 1436 clear_ic_callsites(); 1437 } 1438 1439 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1440 // event and it hasn't already been reported for this nmethod then 1441 // report it now. The event may have been reported earlier if the GC 1442 // marked it for unloading). JvmtiDeferredEventQueue support means 1443 // we no longer go to a safepoint here. 1444 post_compiled_method_unload(); 1445 1446 #ifdef ASSERT 1447 // It's no longer safe to access the oops section since zombie 1448 // nmethods aren't scanned for GC. 1449 _oops_are_stale = true; 1450 #endif 1451 // the Method may be reclaimed by class unloading now that the 1452 // nmethod is in zombie state 1453 set_method(NULL); 1454 } else { 1455 assert(state == not_entrant, "other cases may need to be handled differently"); 1456 } 1457 1458 if (TraceCreateZombies && state == zombie) { 1459 ResourceMark m; 1460 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"); 1461 } 1462 1463 NMethodSweeper::report_state_change(this); 1464 return true; 1465 } 1466 1467 void nmethod::flush() { 1468 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1469 // Note that there are no valid oops in the nmethod anymore. 1470 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1471 "osr nmethod must be unloaded or zombie before flushing"); 1472 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1473 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1474 assert_locked_or_safepoint(CodeCache_lock); 1475 1476 // completely deallocate this method 1477 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1478 if (PrintMethodFlushing) { 1479 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1480 "/Free CodeCache:" SIZE_FORMAT "Kb", 1481 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1482 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1483 } 1484 1485 // We need to deallocate any ExceptionCache data. 1486 // Note that we do not need to grab the nmethod lock for this, it 1487 // better be thread safe if we're disposing of it! 1488 ExceptionCache* ec = exception_cache(); 1489 set_exception_cache(NULL); 1490 while(ec != NULL) { 1491 ExceptionCache* next = ec->next(); 1492 delete ec; 1493 ec = next; 1494 } 1495 1496 Universe::heap()->flush_nmethod(this); 1497 CodeCache::unregister_old_nmethod(this); 1498 1499 CodeBlob::flush(); 1500 CodeCache::free(this); 1501 } 1502 1503 oop nmethod::oop_at(int index) const { 1504 if (index == 0) { 1505 return NULL; 1506 } 1507 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1508 } 1509 1510 oop nmethod::oop_at_phantom(int index) const { 1511 if (index == 0) { 1512 return NULL; 1513 } 1514 return NativeAccess<ON_PHANTOM_OOP_REF>::oop_load(oop_addr_at(index)); 1515 } 1516 1517 // 1518 // Notify all classes this nmethod is dependent on that it is no 1519 // longer dependent. This should only be called in two situations. 1520 // First, when a nmethod transitions to a zombie all dependents need 1521 // to be clear. Since zombification happens at a safepoint there's no 1522 // synchronization issues. The second place is a little more tricky. 1523 // During phase 1 of mark sweep class unloading may happen and as a 1524 // result some nmethods may get unloaded. In this case the flushing 1525 // of dependencies must happen during phase 1 since after GC any 1526 // dependencies in the unloaded nmethod won't be updated, so 1527 // traversing the dependency information in unsafe. In that case this 1528 // function is called with a boolean argument and this function only 1529 // notifies instanceKlasses that are reachable 1530 1531 void nmethod::flush_dependencies(bool delete_immediately) { 1532 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();) 1533 assert(called_by_gc != delete_immediately, 1534 "delete_immediately is false if and only if we are called during GC"); 1535 if (!has_flushed_dependencies()) { 1536 set_has_flushed_dependencies(); 1537 for (Dependencies::DepStream deps(this); deps.next(); ) { 1538 if (deps.type() == Dependencies::call_site_target_value) { 1539 // CallSite dependencies are managed on per-CallSite instance basis. 1540 oop call_site = deps.argument_oop(0); 1541 if (delete_immediately) { 1542 assert_locked_or_safepoint(CodeCache_lock); 1543 MethodHandles::remove_dependent_nmethod(call_site, this); 1544 } else { 1545 MethodHandles::clean_dependency_context(call_site); 1546 } 1547 } else { 1548 Klass* klass = deps.context_type(); 1549 if (klass == NULL) { 1550 continue; // ignore things like evol_method 1551 } 1552 // During GC delete_immediately is false, and liveness 1553 // of dependee determines class that needs to be updated. 1554 if (delete_immediately) { 1555 assert_locked_or_safepoint(CodeCache_lock); 1556 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1557 } else if (klass->is_loader_alive()) { 1558 // The GC may clean dependency contexts concurrently and in parallel. 1559 InstanceKlass::cast(klass)->clean_dependency_context(); 1560 } 1561 } 1562 } 1563 } 1564 } 1565 1566 // ------------------------------------------------------------------ 1567 // post_compiled_method_load_event 1568 // new method for install_code() path 1569 // Transfer information from compilation to jvmti 1570 void nmethod::post_compiled_method_load_event(JvmtiThreadState* state) { 1571 1572 // Don't post this nmethod load event if it is already dying 1573 // because the sweeper might already be deleting this nmethod. 1574 if (is_not_entrant() && can_convert_to_zombie()) { 1575 return; 1576 } 1577 1578 // This is a bad time for a safepoint. We don't want 1579 // this nmethod to get unloaded while we're queueing the event. 1580 NoSafepointVerifier nsv; 1581 1582 Method* m = method(); 1583 HOTSPOT_COMPILED_METHOD_LOAD( 1584 (char *) m->klass_name()->bytes(), 1585 m->klass_name()->utf8_length(), 1586 (char *) m->name()->bytes(), 1587 m->name()->utf8_length(), 1588 (char *) m->signature()->bytes(), 1589 m->signature()->utf8_length(), 1590 insts_begin(), insts_size()); 1591 1592 1593 if (JvmtiExport::should_post_compiled_method_load()) { 1594 // Only post unload events if load events are found. 1595 set_load_reported(); 1596 // If a JavaThread hasn't been passed in, let the Service thread 1597 // (which is a real Java thread) post the event 1598 JvmtiDeferredEvent event = JvmtiDeferredEvent::compiled_method_load_event(this); 1599 if (state == NULL) { 1600 // Execute any barrier code for this nmethod as if it's called, since 1601 // keeping it alive looks like stack walking. 1602 run_nmethod_entry_barrier(); 1603 ServiceThread::enqueue_deferred_event(&event); 1604 } else { 1605 // This enters the nmethod barrier outside in the caller. 1606 state->enqueue_event(&event); 1607 } 1608 } 1609 } 1610 1611 void nmethod::post_compiled_method_unload() { 1612 if (unload_reported()) { 1613 // During unloading we transition to unloaded and then to zombie 1614 // and the unloading is reported during the first transition. 1615 return; 1616 } 1617 1618 assert(_method != NULL && !is_unloaded(), "just checking"); 1619 DTRACE_METHOD_UNLOAD_PROBE(method()); 1620 1621 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1622 // post the event. Sometime later this nmethod will be made a zombie 1623 // by the sweeper but the Method* will not be valid at that point. 1624 // The jmethodID is a weak reference to the Method* so if 1625 // it's being unloaded there's no way to look it up since the weak 1626 // ref will have been cleared. 1627 1628 // Don't bother posting the unload if the load event wasn't posted. 1629 if (load_reported() && JvmtiExport::should_post_compiled_method_unload()) { 1630 assert(!unload_reported(), "already unloaded"); 1631 JvmtiDeferredEvent event = 1632 JvmtiDeferredEvent::compiled_method_unload_event( 1633 method()->jmethod_id(), insts_begin()); 1634 ServiceThread::enqueue_deferred_event(&event); 1635 } 1636 1637 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1638 // any time. As the nmethod is being unloaded now we mark it has 1639 // having the unload event reported - this will ensure that we don't 1640 // attempt to report the event in the unlikely scenario where the 1641 // event is enabled at the time the nmethod is made a zombie. 1642 set_unload_reported(); 1643 } 1644 1645 // Iterate over metadata calling this function. Used by RedefineClasses 1646 void nmethod::metadata_do(MetadataClosure* f) { 1647 { 1648 // Visit all immediate references that are embedded in the instruction stream. 1649 RelocIterator iter(this, oops_reloc_begin()); 1650 while (iter.next()) { 1651 if (iter.type() == relocInfo::metadata_type) { 1652 metadata_Relocation* r = iter.metadata_reloc(); 1653 // In this metadata, we must only follow those metadatas directly embedded in 1654 // the code. Other metadatas (oop_index>0) are seen as part of 1655 // the metadata section below. 1656 assert(1 == (r->metadata_is_immediate()) + 1657 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1658 "metadata must be found in exactly one place"); 1659 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1660 Metadata* md = r->metadata_value(); 1661 if (md != _method) f->do_metadata(md); 1662 } 1663 } else if (iter.type() == relocInfo::virtual_call_type) { 1664 // Check compiledIC holders associated with this nmethod 1665 ResourceMark rm; 1666 CompiledIC *ic = CompiledIC_at(&iter); 1667 if (ic->is_icholder_call()) { 1668 CompiledICHolder* cichk = ic->cached_icholder(); 1669 f->do_metadata(cichk->holder_metadata()); 1670 f->do_metadata(cichk->holder_klass()); 1671 } else { 1672 Metadata* ic_oop = ic->cached_metadata(); 1673 if (ic_oop != NULL) { 1674 f->do_metadata(ic_oop); 1675 } 1676 } 1677 } 1678 } 1679 } 1680 1681 // Visit the metadata section 1682 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1683 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1684 Metadata* md = *p; 1685 f->do_metadata(md); 1686 } 1687 1688 // Visit metadata not embedded in the other places. 1689 if (_method != NULL) f->do_metadata(_method); 1690 } 1691 1692 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1693 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle. 1694 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1695 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1696 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1697 1698 class IsUnloadingState: public AllStatic { 1699 static const uint8_t _is_unloading_mask = 1; 1700 static const uint8_t _is_unloading_shift = 0; 1701 static const uint8_t _unloading_cycle_mask = 6; 1702 static const uint8_t _unloading_cycle_shift = 1; 1703 1704 static uint8_t set_is_unloading(uint8_t state, bool value) { 1705 state &= ~_is_unloading_mask; 1706 if (value) { 1707 state |= 1 << _is_unloading_shift; 1708 } 1709 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1710 return state; 1711 } 1712 1713 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1714 state &= ~_unloading_cycle_mask; 1715 state |= value << _unloading_cycle_shift; 1716 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1717 return state; 1718 } 1719 1720 public: 1721 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1722 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1723 1724 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1725 uint8_t state = 0; 1726 state = set_is_unloading(state, is_unloading); 1727 state = set_unloading_cycle(state, unloading_cycle); 1728 return state; 1729 } 1730 }; 1731 1732 bool nmethod::is_unloading() { 1733 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1734 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1735 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1736 if (state_is_unloading) { 1737 return true; 1738 } 1739 uint8_t current_cycle = CodeCache::unloading_cycle(); 1740 if (state_unloading_cycle == current_cycle) { 1741 return false; 1742 } 1743 1744 // The IsUnloadingBehaviour is responsible for checking if there are any dead 1745 // oops in the CompiledMethod, by calling oops_do on it. 1746 state_unloading_cycle = current_cycle; 1747 1748 if (is_zombie()) { 1749 // Zombies without calculated unloading epoch are never unloading due to GC. 1750 1751 // There are no races where a previously observed is_unloading() nmethod 1752 // suddenly becomes not is_unloading() due to here being observed as zombie. 1753 1754 // With STW unloading, all is_alive() && is_unloading() nmethods are unlinked 1755 // and unloaded in the safepoint. That makes races where an nmethod is first 1756 // observed as is_alive() && is_unloading() and subsequently observed as 1757 // is_zombie() impossible. 1758 1759 // With concurrent unloading, all references to is_unloading() nmethods are 1760 // first unlinked (e.g. IC caches and dependency contexts). Then a global 1761 // handshake operation is performed with all JavaThreads before finally 1762 // unloading the nmethods. The sweeper never converts is_alive() && is_unloading() 1763 // nmethods to zombies; it waits for them to become is_unloaded(). So before 1764 // the global handshake, it is impossible for is_unloading() nmethods to 1765 // racingly become is_zombie(). And is_unloading() is calculated for all is_alive() 1766 // nmethods before taking that global handshake, meaning that it will never 1767 // be recalculated after the handshake. 1768 1769 // After that global handshake, is_unloading() nmethods are only observable 1770 // to the iterators, and they will never trigger recomputation of the cached 1771 // is_unloading_state, and hence may not suffer from such races. 1772 1773 state_is_unloading = false; 1774 } else { 1775 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this); 1776 } 1777 1778 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1779 1780 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1781 1782 return state_is_unloading; 1783 } 1784 1785 void nmethod::clear_unloading_state() { 1786 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1787 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1788 } 1789 1790 1791 // This is called at the end of the strong tracing/marking phase of a 1792 // GC to unload an nmethod if it contains otherwise unreachable 1793 // oops. 1794 1795 void nmethod::do_unloading(bool unloading_occurred) { 1796 // Make sure the oop's ready to receive visitors 1797 assert(!is_zombie() && !is_unloaded(), 1798 "should not call follow on zombie or unloaded nmethod"); 1799 1800 if (is_unloading()) { 1801 make_unloaded(); 1802 } else { 1803 guarantee(unload_nmethod_caches(unloading_occurred), 1804 "Should not need transition stubs"); 1805 } 1806 } 1807 1808 void nmethod::oops_do(OopClosure* f, bool allow_dead) { 1809 // make sure the oops ready to receive visitors 1810 assert(allow_dead || is_alive(), "should not call follow on dead nmethod"); 1811 1812 // Prevent extra code cache walk for platforms that don't have immediate oops. 1813 if (relocInfo::mustIterateImmediateOopsInCode()) { 1814 RelocIterator iter(this, oops_reloc_begin()); 1815 1816 while (iter.next()) { 1817 if (iter.type() == relocInfo::oop_type ) { 1818 oop_Relocation* r = iter.oop_reloc(); 1819 // In this loop, we must only follow those oops directly embedded in 1820 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1821 assert(1 == (r->oop_is_immediate()) + 1822 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1823 "oop must be found in exactly one place"); 1824 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1825 f->do_oop(r->oop_addr()); 1826 } 1827 } 1828 } 1829 } 1830 1831 // Scopes 1832 // This includes oop constants not inlined in the code stream. 1833 for (oop* p = oops_begin(); p < oops_end(); p++) { 1834 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1835 f->do_oop(p); 1836 } 1837 } 1838 1839 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1840 1841 void nmethod::oops_do_log_change(const char* state) { 1842 LogTarget(Trace, gc, nmethod) lt; 1843 if (lt.is_enabled()) { 1844 LogStream ls(lt); 1845 CompileTask::print(&ls, this, state, true /* short_form */); 1846 } 1847 } 1848 1849 bool nmethod::oops_do_try_claim() { 1850 if (oops_do_try_claim_weak_request()) { 1851 nmethod* result = oops_do_try_add_to_list_as_weak_done(); 1852 assert(result == NULL, "adding to global list as weak done must always succeed."); 1853 return true; 1854 } 1855 return false; 1856 } 1857 1858 bool nmethod::oops_do_try_claim_weak_request() { 1859 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1860 1861 if ((_oops_do_mark_link == NULL) && 1862 (Atomic::replace_if_null(&_oops_do_mark_link, mark_link(this, claim_weak_request_tag)))) { 1863 oops_do_log_change("oops_do, mark weak request"); 1864 return true; 1865 } 1866 return false; 1867 } 1868 1869 void nmethod::oops_do_set_strong_done(nmethod* old_head) { 1870 _oops_do_mark_link = mark_link(old_head, claim_strong_done_tag); 1871 } 1872 1873 nmethod::oops_do_mark_link* nmethod::oops_do_try_claim_strong_done() { 1874 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1875 1876 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)); 1877 if (old_next == NULL) { 1878 oops_do_log_change("oops_do, mark strong done"); 1879 } 1880 return old_next; 1881 } 1882 1883 nmethod::oops_do_mark_link* nmethod::oops_do_try_add_strong_request(nmethod::oops_do_mark_link* next) { 1884 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1885 assert(next == mark_link(this, claim_weak_request_tag), "Should be claimed as weak"); 1886 1887 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(this, claim_strong_request_tag)); 1888 if (old_next == next) { 1889 oops_do_log_change("oops_do, mark strong request"); 1890 } 1891 return old_next; 1892 } 1893 1894 bool nmethod::oops_do_try_claim_weak_done_as_strong_done(nmethod::oops_do_mark_link* next) { 1895 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1896 assert(extract_state(next) == claim_weak_done_tag, "Should be claimed as weak done"); 1897 1898 oops_do_mark_link* old_next = Atomic::cmpxchg(&_oops_do_mark_link, next, mark_link(extract_nmethod(next), claim_strong_done_tag)); 1899 if (old_next == next) { 1900 oops_do_log_change("oops_do, mark weak done -> mark strong done"); 1901 return true; 1902 } 1903 return false; 1904 } 1905 1906 nmethod* nmethod::oops_do_try_add_to_list_as_weak_done() { 1907 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1908 1909 assert(extract_state(_oops_do_mark_link) == claim_weak_request_tag || 1910 extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1911 "must be but is nmethod " PTR_FORMAT " %u", p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1912 1913 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1914 // Self-loop if needed. 1915 if (old_head == NULL) { 1916 old_head = this; 1917 } 1918 // Try to install end of list and weak done tag. 1919 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)) { 1920 oops_do_log_change("oops_do, mark weak done"); 1921 return NULL; 1922 } else { 1923 return old_head; 1924 } 1925 } 1926 1927 void nmethod::oops_do_add_to_list_as_strong_done() { 1928 assert(SafepointSynchronize::is_at_safepoint(), "only at safepoint"); 1929 1930 nmethod* old_head = Atomic::xchg(&_oops_do_mark_nmethods, this); 1931 // Self-loop if needed. 1932 if (old_head == NULL) { 1933 old_head = this; 1934 } 1935 assert(_oops_do_mark_link == mark_link(this, claim_strong_done_tag), "must be but is nmethod " PTR_FORMAT " state %u", 1936 p2i(extract_nmethod(_oops_do_mark_link)), extract_state(_oops_do_mark_link)); 1937 1938 oops_do_set_strong_done(old_head); 1939 } 1940 1941 void nmethod::oops_do_process_weak(OopsDoProcessor* p) { 1942 if (!oops_do_try_claim_weak_request()) { 1943 // Failed to claim for weak processing. 1944 oops_do_log_change("oops_do, mark weak request fail"); 1945 return; 1946 } 1947 1948 p->do_regular_processing(this); 1949 1950 nmethod* old_head = oops_do_try_add_to_list_as_weak_done(); 1951 if (old_head == NULL) { 1952 return; 1953 } 1954 oops_do_log_change("oops_do, mark weak done fail"); 1955 // Adding to global list failed, another thread added a strong request. 1956 assert(extract_state(_oops_do_mark_link) == claim_strong_request_tag, 1957 "must be but is %u", extract_state(_oops_do_mark_link)); 1958 1959 oops_do_log_change("oops_do, mark weak request -> mark strong done"); 1960 1961 oops_do_set_strong_done(old_head); 1962 // Do missing strong processing. 1963 p->do_remaining_strong_processing(this); 1964 } 1965 1966 void nmethod::oops_do_process_strong(OopsDoProcessor* p) { 1967 oops_do_mark_link* next_raw = oops_do_try_claim_strong_done(); 1968 if (next_raw == NULL) { 1969 p->do_regular_processing(this); 1970 oops_do_add_to_list_as_strong_done(); 1971 return; 1972 } 1973 // Claim failed. Figure out why and handle it. 1974 if (oops_do_has_weak_request(next_raw)) { 1975 oops_do_mark_link* old = next_raw; 1976 // Claim failed because being weak processed (state == "weak request"). 1977 // Try to request deferred strong processing. 1978 next_raw = oops_do_try_add_strong_request(old); 1979 if (next_raw == old) { 1980 // Successfully requested deferred strong processing. 1981 return; 1982 } 1983 // Failed because of a concurrent transition. No longer in "weak request" state. 1984 } 1985 if (oops_do_has_any_strong_state(next_raw)) { 1986 // Already claimed for strong processing or requested for such. 1987 return; 1988 } 1989 if (oops_do_try_claim_weak_done_as_strong_done(next_raw)) { 1990 // Successfully claimed "weak done" as "strong done". Do the missing marking. 1991 p->do_remaining_strong_processing(this); 1992 return; 1993 } 1994 // Claim failed, some other thread got it. 1995 } 1996 1997 void nmethod::oops_do_marking_prologue() { 1998 assert_at_safepoint(); 1999 2000 log_trace(gc, nmethod)("oops_do_marking_prologue"); 2001 assert(_oops_do_mark_nmethods == NULL, "must be empty"); 2002 } 2003 2004 void nmethod::oops_do_marking_epilogue() { 2005 assert_at_safepoint(); 2006 2007 nmethod* next = _oops_do_mark_nmethods; 2008 _oops_do_mark_nmethods = NULL; 2009 if (next != NULL) { 2010 nmethod* cur; 2011 do { 2012 cur = next; 2013 next = extract_nmethod(cur->_oops_do_mark_link); 2014 cur->_oops_do_mark_link = NULL; 2015 DEBUG_ONLY(cur->verify_oop_relocations()); 2016 2017 LogTarget(Trace, gc, nmethod) lt; 2018 if (lt.is_enabled()) { 2019 LogStream ls(lt); 2020 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 2021 } 2022 // End if self-loop has been detected. 2023 } while (cur != next); 2024 } 2025 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 2026 } 2027 2028 inline bool includes(void* p, void* from, void* to) { 2029 return from <= p && p < to; 2030 } 2031 2032 2033 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2034 assert(count >= 2, "must be sentinel values, at least"); 2035 2036 #ifdef ASSERT 2037 // must be sorted and unique; we do a binary search in find_pc_desc() 2038 int prev_offset = pcs[0].pc_offset(); 2039 assert(prev_offset == PcDesc::lower_offset_limit, 2040 "must start with a sentinel"); 2041 for (int i = 1; i < count; i++) { 2042 int this_offset = pcs[i].pc_offset(); 2043 assert(this_offset > prev_offset, "offsets must be sorted"); 2044 prev_offset = this_offset; 2045 } 2046 assert(prev_offset == PcDesc::upper_offset_limit, 2047 "must end with a sentinel"); 2048 #endif //ASSERT 2049 2050 // Search for MethodHandle invokes and tag the nmethod. 2051 for (int i = 0; i < count; i++) { 2052 if (pcs[i].is_method_handle_invoke()) { 2053 set_has_method_handle_invokes(true); 2054 break; 2055 } 2056 } 2057 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 2058 2059 int size = count * sizeof(PcDesc); 2060 assert(scopes_pcs_size() >= size, "oob"); 2061 memcpy(scopes_pcs_begin(), pcs, size); 2062 2063 // Adjust the final sentinel downward. 2064 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2065 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2066 last_pc->set_pc_offset(content_size() + 1); 2067 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2068 // Fill any rounding gaps with copies of the last record. 2069 last_pc[1] = last_pc[0]; 2070 } 2071 // The following assert could fail if sizeof(PcDesc) is not 2072 // an integral multiple of oopSize (the rounding term). 2073 // If it fails, change the logic to always allocate a multiple 2074 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2075 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2076 } 2077 2078 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2079 assert(scopes_data_size() >= size, "oob"); 2080 memcpy(scopes_data_begin(), buffer, size); 2081 } 2082 2083 #ifdef ASSERT 2084 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 2085 PcDesc* lower = search.scopes_pcs_begin(); 2086 PcDesc* upper = search.scopes_pcs_end(); 2087 lower += 1; // exclude initial sentinel 2088 PcDesc* res = NULL; 2089 for (PcDesc* p = lower; p < upper; p++) { 2090 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2091 if (match_desc(p, pc_offset, approximate)) { 2092 if (res == NULL) 2093 res = p; 2094 else 2095 res = (PcDesc*) badAddress; 2096 } 2097 } 2098 return res; 2099 } 2100 #endif 2101 2102 2103 // Finds a PcDesc with real-pc equal to "pc" 2104 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 2105 address base_address = search.code_begin(); 2106 if ((pc < base_address) || 2107 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2108 return NULL; // PC is wildly out of range 2109 } 2110 int pc_offset = (int) (pc - base_address); 2111 2112 // Check the PcDesc cache if it contains the desired PcDesc 2113 // (This as an almost 100% hit rate.) 2114 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2115 if (res != NULL) { 2116 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 2117 return res; 2118 } 2119 2120 // Fallback algorithm: quasi-linear search for the PcDesc 2121 // Find the last pc_offset less than the given offset. 2122 // The successor must be the required match, if there is a match at all. 2123 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2124 PcDesc* lower = search.scopes_pcs_begin(); 2125 PcDesc* upper = search.scopes_pcs_end(); 2126 upper -= 1; // exclude final sentinel 2127 if (lower >= upper) return NULL; // native method; no PcDescs at all 2128 2129 #define assert_LU_OK \ 2130 /* invariant on lower..upper during the following search: */ \ 2131 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2132 assert(upper->pc_offset() >= pc_offset, "sanity") 2133 assert_LU_OK; 2134 2135 // Use the last successful return as a split point. 2136 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2137 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2138 if (mid->pc_offset() < pc_offset) { 2139 lower = mid; 2140 } else { 2141 upper = mid; 2142 } 2143 2144 // Take giant steps at first (4096, then 256, then 16, then 1) 2145 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2146 const int RADIX = (1 << LOG2_RADIX); 2147 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2148 while ((mid = lower + step) < upper) { 2149 assert_LU_OK; 2150 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2151 if (mid->pc_offset() < pc_offset) { 2152 lower = mid; 2153 } else { 2154 upper = mid; 2155 break; 2156 } 2157 } 2158 assert_LU_OK; 2159 } 2160 2161 // Sneak up on the value with a linear search of length ~16. 2162 while (true) { 2163 assert_LU_OK; 2164 mid = lower + 1; 2165 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2166 if (mid->pc_offset() < pc_offset) { 2167 lower = mid; 2168 } else { 2169 upper = mid; 2170 break; 2171 } 2172 } 2173 #undef assert_LU_OK 2174 2175 if (match_desc(upper, pc_offset, approximate)) { 2176 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 2177 _pc_desc_cache.add_pc_desc(upper); 2178 return upper; 2179 } else { 2180 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 2181 return NULL; 2182 } 2183 } 2184 2185 2186 void nmethod::check_all_dependencies(DepChange& changes) { 2187 // Checked dependencies are allocated into this ResourceMark 2188 ResourceMark rm; 2189 2190 // Turn off dependency tracing while actually testing dependencies. 2191 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2192 2193 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2194 &DependencySignature::equals, 11027> DepTable; 2195 2196 DepTable* table = new DepTable(); 2197 2198 // Iterate over live nmethods and check dependencies of all nmethods that are not 2199 // marked for deoptimization. A particular dependency is only checked once. 2200 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading); 2201 while(iter.next()) { 2202 nmethod* nm = iter.method(); 2203 // Only notify for live nmethods 2204 if (!nm->is_marked_for_deoptimization()) { 2205 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2206 // Construct abstraction of a dependency. 2207 DependencySignature* current_sig = new DependencySignature(deps); 2208 2209 // Determine if dependency is already checked. table->put(...) returns 2210 // 'true' if the dependency is added (i.e., was not in the hashtable). 2211 if (table->put(*current_sig, 1)) { 2212 if (deps.check_dependency() != NULL) { 2213 // Dependency checking failed. Print out information about the failed 2214 // dependency and finally fail with an assert. We can fail here, since 2215 // dependency checking is never done in a product build. 2216 tty->print_cr("Failed dependency:"); 2217 changes.print(); 2218 nm->print(); 2219 nm->print_dependencies(); 2220 assert(false, "Should have been marked for deoptimization"); 2221 } 2222 } 2223 } 2224 } 2225 } 2226 } 2227 2228 bool nmethod::check_dependency_on(DepChange& changes) { 2229 // What has happened: 2230 // 1) a new class dependee has been added 2231 // 2) dependee and all its super classes have been marked 2232 bool found_check = false; // set true if we are upset 2233 for (Dependencies::DepStream deps(this); deps.next(); ) { 2234 // Evaluate only relevant dependencies. 2235 if (deps.spot_check_dependency_at(changes) != NULL) { 2236 found_check = true; 2237 NOT_DEBUG(break); 2238 } 2239 } 2240 return found_check; 2241 } 2242 2243 // Called from mark_for_deoptimization, when dependee is invalidated. 2244 bool nmethod::is_dependent_on_method(Method* dependee) { 2245 for (Dependencies::DepStream deps(this); deps.next(); ) { 2246 if (deps.type() != Dependencies::evol_method) 2247 continue; 2248 Method* method = deps.method_argument(0); 2249 if (method == dependee) return true; 2250 } 2251 return false; 2252 } 2253 2254 2255 bool nmethod::is_patchable_at(address instr_addr) { 2256 assert(insts_contains(instr_addr), "wrong nmethod used"); 2257 if (is_zombie()) { 2258 // a zombie may never be patched 2259 return false; 2260 } 2261 return true; 2262 } 2263 2264 2265 void nmethod_init() { 2266 // make sure you didn't forget to adjust the filler fields 2267 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2268 } 2269 2270 2271 //------------------------------------------------------------------------------------------- 2272 2273 2274 // QQQ might we make this work from a frame?? 2275 nmethodLocker::nmethodLocker(address pc) { 2276 CodeBlob* cb = CodeCache::find_blob(pc); 2277 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2278 _nm = cb->as_compiled_method(); 2279 lock_nmethod(_nm); 2280 } 2281 2282 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2283 // should pass zombie_ok == true. 2284 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2285 if (cm == NULL) return; 2286 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2287 nmethod* nm = cm->as_nmethod(); 2288 Atomic::inc(&nm->_lock_count); 2289 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method: %p", nm); 2290 } 2291 2292 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2293 if (cm == NULL) return; 2294 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2295 nmethod* nm = cm->as_nmethod(); 2296 Atomic::dec(&nm->_lock_count); 2297 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2298 } 2299 2300 2301 // ----------------------------------------------------------------------------- 2302 // Verification 2303 2304 class VerifyOopsClosure: public OopClosure { 2305 nmethod* _nm; 2306 bool _ok; 2307 public: 2308 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2309 bool ok() { return _ok; } 2310 virtual void do_oop(oop* p) { 2311 if (oopDesc::is_oop_or_null(*p)) return; 2312 // Print diagnostic information before calling print_nmethod(). 2313 // Assertions therein might prevent call from returning. 2314 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2315 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2316 if (_ok) { 2317 _nm->print_nmethod(true); 2318 _ok = false; 2319 } 2320 } 2321 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2322 }; 2323 2324 class VerifyMetadataClosure: public MetadataClosure { 2325 public: 2326 void do_metadata(Metadata* md) { 2327 if (md->is_method()) { 2328 Method* method = (Method*)md; 2329 assert(!method->is_old(), "Should not be installing old methods"); 2330 } 2331 } 2332 }; 2333 2334 2335 void nmethod::verify() { 2336 2337 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2338 // seems odd. 2339 2340 if (is_zombie() || is_not_entrant() || is_unloaded()) 2341 return; 2342 2343 // Make sure all the entry points are correctly aligned for patching. 2344 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2345 2346 // assert(oopDesc::is_oop(method()), "must be valid"); 2347 2348 ResourceMark rm; 2349 2350 if (!CodeCache::contains(this)) { 2351 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2352 } 2353 2354 if(is_native_method() ) 2355 return; 2356 2357 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2358 if (nm != this) { 2359 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2360 } 2361 2362 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2363 if (! p->verify(this)) { 2364 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2365 } 2366 } 2367 2368 #ifdef ASSERT 2369 #if INCLUDE_JVMCI 2370 { 2371 // Verify that implicit exceptions that deoptimize have a PcDesc and OopMap 2372 ImmutableOopMapSet* oms = oop_maps(); 2373 ImplicitExceptionTable implicit_table(this); 2374 for (uint i = 0; i < implicit_table.len(); i++) { 2375 int exec_offset = (int) implicit_table.get_exec_offset(i); 2376 if (implicit_table.get_exec_offset(i) == implicit_table.get_cont_offset(i)) { 2377 assert(pc_desc_at(code_begin() + exec_offset) != NULL, "missing PcDesc"); 2378 bool found = false; 2379 for (int i = 0, imax = oms->count(); i < imax; i++) { 2380 if (oms->pair_at(i)->pc_offset() == exec_offset) { 2381 found = true; 2382 break; 2383 } 2384 } 2385 assert(found, "missing oopmap"); 2386 } 2387 } 2388 } 2389 #endif 2390 #endif 2391 2392 VerifyOopsClosure voc(this); 2393 oops_do(&voc); 2394 assert(voc.ok(), "embedded oops must be OK"); 2395 Universe::heap()->verify_nmethod(this); 2396 2397 assert(_oops_do_mark_link == NULL, "_oops_do_mark_link for %s should be NULL but is " PTR_FORMAT, 2398 nm->method()->external_name(), p2i(_oops_do_mark_link)); 2399 verify_scopes(); 2400 2401 CompiledICLocker nm_verify(this); 2402 VerifyMetadataClosure vmc; 2403 metadata_do(&vmc); 2404 } 2405 2406 2407 void nmethod::verify_interrupt_point(address call_site) { 2408 // Verify IC only when nmethod installation is finished. 2409 if (!is_not_installed()) { 2410 if (CompiledICLocker::is_safe(this)) { 2411 CompiledIC_at(this, call_site); 2412 } else { 2413 CompiledICLocker ml_verify(this); 2414 CompiledIC_at(this, call_site); 2415 } 2416 } 2417 2418 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2419 assert(pd != NULL, "PcDesc must exist"); 2420 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2421 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2422 pd->return_oop()); 2423 !sd->is_top(); sd = sd->sender()) { 2424 sd->verify(); 2425 } 2426 } 2427 2428 void nmethod::verify_scopes() { 2429 if( !method() ) return; // Runtime stubs have no scope 2430 if (method()->is_native()) return; // Ignore stub methods. 2431 // iterate through all interrupt point 2432 // and verify the debug information is valid. 2433 RelocIterator iter((nmethod*)this); 2434 while (iter.next()) { 2435 address stub = NULL; 2436 switch (iter.type()) { 2437 case relocInfo::virtual_call_type: 2438 verify_interrupt_point(iter.addr()); 2439 break; 2440 case relocInfo::opt_virtual_call_type: 2441 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2442 verify_interrupt_point(iter.addr()); 2443 break; 2444 case relocInfo::static_call_type: 2445 stub = iter.static_call_reloc()->static_stub(false); 2446 //verify_interrupt_point(iter.addr()); 2447 break; 2448 case relocInfo::runtime_call_type: 2449 case relocInfo::runtime_call_w_cp_type: { 2450 address destination = iter.reloc()->value(); 2451 // Right now there is no way to find out which entries support 2452 // an interrupt point. It would be nice if we had this 2453 // information in a table. 2454 break; 2455 } 2456 default: 2457 break; 2458 } 2459 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2460 } 2461 } 2462 2463 2464 // ----------------------------------------------------------------------------- 2465 // Printing operations 2466 2467 void nmethod::print() const { 2468 ttyLocker ttyl; // keep the following output all in one block 2469 print(tty); 2470 } 2471 2472 void nmethod::print(outputStream* st) const { 2473 ResourceMark rm; 2474 2475 st->print("Compiled method "); 2476 2477 if (is_compiled_by_c1()) { 2478 st->print("(c1) "); 2479 } else if (is_compiled_by_c2()) { 2480 st->print("(c2) "); 2481 } else if (is_compiled_by_jvmci()) { 2482 st->print("(JVMCI) "); 2483 } else { 2484 st->print("(n/a) "); 2485 } 2486 2487 print_on(tty, NULL); 2488 2489 if (WizardMode) { 2490 st->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2491 st->print(" for method " INTPTR_FORMAT , p2i(method())); 2492 st->print(" { "); 2493 st->print_cr("%s ", state()); 2494 st->print_cr("}:"); 2495 } 2496 if (size () > 0) st->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2497 p2i(this), 2498 p2i(this) + size(), 2499 size()); 2500 if (relocation_size () > 0) st->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2501 p2i(relocation_begin()), 2502 p2i(relocation_end()), 2503 relocation_size()); 2504 if (consts_size () > 0) st->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2505 p2i(consts_begin()), 2506 p2i(consts_end()), 2507 consts_size()); 2508 if (insts_size () > 0) st->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2509 p2i(insts_begin()), 2510 p2i(insts_end()), 2511 insts_size()); 2512 if (stub_size () > 0) st->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2513 p2i(stub_begin()), 2514 p2i(stub_end()), 2515 stub_size()); 2516 if (oops_size () > 0) st->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2517 p2i(oops_begin()), 2518 p2i(oops_end()), 2519 oops_size()); 2520 if (metadata_size () > 0) st->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2521 p2i(metadata_begin()), 2522 p2i(metadata_end()), 2523 metadata_size()); 2524 if (scopes_data_size () > 0) st->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2525 p2i(scopes_data_begin()), 2526 p2i(scopes_data_end()), 2527 scopes_data_size()); 2528 if (scopes_pcs_size () > 0) st->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2529 p2i(scopes_pcs_begin()), 2530 p2i(scopes_pcs_end()), 2531 scopes_pcs_size()); 2532 if (dependencies_size () > 0) st->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2533 p2i(dependencies_begin()), 2534 p2i(dependencies_end()), 2535 dependencies_size()); 2536 if (handler_table_size() > 0) st->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2537 p2i(handler_table_begin()), 2538 p2i(handler_table_end()), 2539 handler_table_size()); 2540 if (nul_chk_table_size() > 0) st->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2541 p2i(nul_chk_table_begin()), 2542 p2i(nul_chk_table_end()), 2543 nul_chk_table_size()); 2544 #if INCLUDE_JVMCI 2545 if (speculations_size () > 0) st->print_cr(" speculations [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2546 p2i(speculations_begin()), 2547 p2i(speculations_end()), 2548 speculations_size()); 2549 if (jvmci_data_size () > 0) st->print_cr(" JVMCI data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2550 p2i(jvmci_data_begin()), 2551 p2i(jvmci_data_end()), 2552 jvmci_data_size()); 2553 #endif 2554 } 2555 2556 void nmethod::print_code() { 2557 HandleMark hm; 2558 ResourceMark m; 2559 ttyLocker ttyl; 2560 // Call the specialized decode method of this class. 2561 decode(tty); 2562 } 2563 2564 #ifndef PRODUCT // called InstanceKlass methods are available only then. Declared as PRODUCT_RETURN 2565 2566 void nmethod::print_dependencies() { 2567 ResourceMark rm; 2568 ttyLocker ttyl; // keep the following output all in one block 2569 tty->print_cr("Dependencies:"); 2570 for (Dependencies::DepStream deps(this); deps.next(); ) { 2571 deps.print_dependency(); 2572 Klass* ctxk = deps.context_type(); 2573 if (ctxk != NULL) { 2574 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2575 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2576 } 2577 } 2578 deps.log_dependency(); // put it into the xml log also 2579 } 2580 } 2581 #endif 2582 2583 #if defined(SUPPORT_DATA_STRUCTS) 2584 2585 // Print the oops from the underlying CodeBlob. 2586 void nmethod::print_oops(outputStream* st) { 2587 HandleMark hm; 2588 ResourceMark m; 2589 st->print("Oops:"); 2590 if (oops_begin() < oops_end()) { 2591 st->cr(); 2592 for (oop* p = oops_begin(); p < oops_end(); p++) { 2593 Disassembler::print_location((unsigned char*)p, (unsigned char*)oops_begin(), (unsigned char*)oops_end(), st, true, false); 2594 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2595 if (*p == Universe::non_oop_word()) { 2596 st->print_cr("NON_OOP"); 2597 continue; // skip non-oops 2598 } 2599 if (*p == NULL) { 2600 st->print_cr("NULL-oop"); 2601 continue; // skip non-oops 2602 } 2603 (*p)->print_value_on(st); 2604 st->cr(); 2605 } 2606 } else { 2607 st->print_cr(" <list empty>"); 2608 } 2609 } 2610 2611 // Print metadata pool. 2612 void nmethod::print_metadata(outputStream* st) { 2613 HandleMark hm; 2614 ResourceMark m; 2615 st->print("Metadata:"); 2616 if (metadata_begin() < metadata_end()) { 2617 st->cr(); 2618 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2619 Disassembler::print_location((unsigned char*)p, (unsigned char*)metadata_begin(), (unsigned char*)metadata_end(), st, true, false); 2620 st->print(PTR_FORMAT " ", *((uintptr_t*)p)); 2621 if (*p && *p != Universe::non_oop_word()) { 2622 (*p)->print_value_on(st); 2623 } 2624 st->cr(); 2625 } 2626 } else { 2627 st->print_cr(" <list empty>"); 2628 } 2629 } 2630 2631 #ifndef PRODUCT // ScopeDesc::print_on() is available only then. Declared as PRODUCT_RETURN 2632 void nmethod::print_scopes_on(outputStream* st) { 2633 // Find the first pc desc for all scopes in the code and print it. 2634 ResourceMark rm; 2635 st->print("scopes:"); 2636 if (scopes_pcs_begin() < scopes_pcs_end()) { 2637 st->cr(); 2638 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2639 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2640 continue; 2641 2642 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2643 while (sd != NULL) { 2644 sd->print_on(st, p); // print output ends with a newline 2645 sd = sd->sender(); 2646 } 2647 } 2648 } else { 2649 st->print_cr(" <list empty>"); 2650 } 2651 } 2652 #endif 2653 2654 #ifndef PRODUCT // RelocIterator does support printing only then. 2655 void nmethod::print_relocations() { 2656 ResourceMark m; // in case methods get printed via the debugger 2657 tty->print_cr("relocations:"); 2658 RelocIterator iter(this); 2659 iter.print(); 2660 } 2661 #endif 2662 2663 void nmethod::print_pcs_on(outputStream* st) { 2664 ResourceMark m; // in case methods get printed via debugger 2665 st->print("pc-bytecode offsets:"); 2666 if (scopes_pcs_begin() < scopes_pcs_end()) { 2667 st->cr(); 2668 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2669 p->print_on(st, this); // print output ends with a newline 2670 } 2671 } else { 2672 st->print_cr(" <list empty>"); 2673 } 2674 } 2675 2676 void nmethod::print_handler_table() { 2677 ExceptionHandlerTable(this).print(); 2678 } 2679 2680 void nmethod::print_nul_chk_table() { 2681 ImplicitExceptionTable(this).print(code_begin()); 2682 } 2683 2684 void nmethod::print_recorded_oops() { 2685 const int n = oops_count(); 2686 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2687 tty->print("Recorded oops:"); 2688 if (n > 0) { 2689 tty->cr(); 2690 for (int i = 0; i < n; i++) { 2691 oop o = oop_at(i); 2692 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(o)); 2693 if (o == (oop)Universe::non_oop_word()) { 2694 tty->print("non-oop word"); 2695 } else if (o == NULL) { 2696 tty->print("NULL-oop"); 2697 } else { 2698 o->print_value_on(tty); 2699 } 2700 tty->cr(); 2701 } 2702 } else { 2703 tty->print_cr(" <list empty>"); 2704 } 2705 } 2706 2707 void nmethod::print_recorded_metadata() { 2708 const int n = metadata_count(); 2709 const int log_n = (n<10) ? 1 : (n<100) ? 2 : (n<1000) ? 3 : (n<10000) ? 4 : 6; 2710 tty->print("Recorded metadata:"); 2711 if (n > 0) { 2712 tty->cr(); 2713 for (int i = 0; i < n; i++) { 2714 Metadata* m = metadata_at(i); 2715 tty->print("#%*d: " INTPTR_FORMAT " ", log_n, i, p2i(m)); 2716 if (m == (Metadata*)Universe::non_oop_word()) { 2717 tty->print("non-metadata word"); 2718 } else if (m == NULL) { 2719 tty->print("NULL-oop"); 2720 } else { 2721 Metadata::print_value_on_maybe_null(tty, m); 2722 } 2723 tty->cr(); 2724 } 2725 } else { 2726 tty->print_cr(" <list empty>"); 2727 } 2728 } 2729 #endif 2730 2731 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2732 2733 void nmethod::print_constant_pool(outputStream* st) { 2734 //----------------------------------- 2735 //---< Print the constant pool >--- 2736 //----------------------------------- 2737 int consts_size = this->consts_size(); 2738 if ( consts_size > 0 ) { 2739 unsigned char* cstart = this->consts_begin(); 2740 unsigned char* cp = cstart; 2741 unsigned char* cend = cp + consts_size; 2742 unsigned int bytes_per_line = 4; 2743 unsigned int CP_alignment = 8; 2744 unsigned int n; 2745 2746 st->cr(); 2747 2748 //---< print CP header to make clear what's printed >--- 2749 if( ((uintptr_t)cp&(CP_alignment-1)) == 0 ) { 2750 n = bytes_per_line; 2751 st->print_cr("[Constant Pool]"); 2752 Disassembler::print_location(cp, cstart, cend, st, true, true); 2753 Disassembler::print_hexdata(cp, n, st, true); 2754 st->cr(); 2755 } else { 2756 n = (uintptr_t)cp&(bytes_per_line-1); 2757 st->print_cr("[Constant Pool (unaligned)]"); 2758 } 2759 2760 //---< print CP contents, bytes_per_line at a time >--- 2761 while (cp < cend) { 2762 Disassembler::print_location(cp, cstart, cend, st, true, false); 2763 Disassembler::print_hexdata(cp, n, st, false); 2764 cp += n; 2765 n = bytes_per_line; 2766 st->cr(); 2767 } 2768 2769 //---< Show potential alignment gap between constant pool and code >--- 2770 cend = code_begin(); 2771 if( cp < cend ) { 2772 n = 4; 2773 st->print_cr("[Code entry alignment]"); 2774 while (cp < cend) { 2775 Disassembler::print_location(cp, cstart, cend, st, false, false); 2776 cp += n; 2777 st->cr(); 2778 } 2779 } 2780 } else { 2781 st->print_cr("[Constant Pool (empty)]"); 2782 } 2783 st->cr(); 2784 } 2785 2786 #endif 2787 2788 // Disassemble this nmethod. 2789 // Print additional debug information, if requested. This could be code 2790 // comments, block comments, profiling counters, etc. 2791 // The undisassembled format is useful no disassembler library is available. 2792 // The resulting hex dump (with markers) can be disassembled later, or on 2793 // another system, when/where a disassembler library is available. 2794 void nmethod::decode2(outputStream* ost) const { 2795 2796 // Called from frame::back_trace_with_decode without ResourceMark. 2797 ResourceMark rm; 2798 2799 // Make sure we have a valid stream to print on. 2800 outputStream* st = ost ? ost : tty; 2801 2802 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) && ! defined(SUPPORT_ASSEMBLY) 2803 const bool use_compressed_format = true; 2804 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2805 AbstractDisassembler::show_block_comment()); 2806 #else 2807 const bool use_compressed_format = Disassembler::is_abstract(); 2808 const bool compressed_with_comments = use_compressed_format && (AbstractDisassembler::show_comment() || 2809 AbstractDisassembler::show_block_comment()); 2810 #endif 2811 2812 st->cr(); 2813 this->print(st); 2814 st->cr(); 2815 2816 #if defined(SUPPORT_ASSEMBLY) 2817 //---------------------------------- 2818 //---< Print real disassembly >--- 2819 //---------------------------------- 2820 if (! use_compressed_format) { 2821 Disassembler::decode(const_cast<nmethod*>(this), st); 2822 return; 2823 } 2824 #endif 2825 2826 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2827 2828 // Compressed undisassembled disassembly format. 2829 // The following stati are defined/supported: 2830 // = 0 - currently at bol() position, nothing printed yet on current line. 2831 // = 1 - currently at position after print_location(). 2832 // > 1 - in the midst of printing instruction stream bytes. 2833 int compressed_format_idx = 0; 2834 int code_comment_column = 0; 2835 const int instr_maxlen = Assembler::instr_maxlen(); 2836 const uint tabspacing = 8; 2837 unsigned char* start = this->code_begin(); 2838 unsigned char* p = this->code_begin(); 2839 unsigned char* end = this->code_end(); 2840 unsigned char* pss = p; // start of a code section (used for offsets) 2841 2842 if ((start == NULL) || (end == NULL)) { 2843 st->print_cr("PrintAssembly not possible due to uninitialized section pointers"); 2844 return; 2845 } 2846 #endif 2847 2848 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2849 //---< plain abstract disassembly, no comments or anything, just section headers >--- 2850 if (use_compressed_format && ! compressed_with_comments) { 2851 const_cast<nmethod*>(this)->print_constant_pool(st); 2852 2853 //---< Open the output (Marker for post-mortem disassembler) >--- 2854 st->print_cr("[MachCode]"); 2855 const char* header = NULL; 2856 address p0 = p; 2857 while (p < end) { 2858 address pp = p; 2859 while ((p < end) && (header == NULL)) { 2860 header = nmethod_section_label(p); 2861 pp = p; 2862 p += Assembler::instr_len(p); 2863 } 2864 if (pp > p0) { 2865 AbstractDisassembler::decode_range_abstract(p0, pp, start, end, st, Assembler::instr_maxlen()); 2866 p0 = pp; 2867 p = pp; 2868 header = NULL; 2869 } else if (header != NULL) { 2870 st->bol(); 2871 st->print_cr("%s", header); 2872 header = NULL; 2873 } 2874 } 2875 //---< Close the output (Marker for post-mortem disassembler) >--- 2876 st->bol(); 2877 st->print_cr("[/MachCode]"); 2878 return; 2879 } 2880 #endif 2881 2882 #if defined(SUPPORT_ABSTRACT_ASSEMBLY) 2883 //---< abstract disassembly with comments and section headers merged in >--- 2884 if (compressed_with_comments) { 2885 const_cast<nmethod*>(this)->print_constant_pool(st); 2886 2887 //---< Open the output (Marker for post-mortem disassembler) >--- 2888 st->print_cr("[MachCode]"); 2889 while ((p < end) && (p != NULL)) { 2890 const int instruction_size_in_bytes = Assembler::instr_len(p); 2891 2892 //---< Block comments for nmethod. Interrupts instruction stream, if any. >--- 2893 // Outputs a bol() before and a cr() after, but only if a comment is printed. 2894 // Prints nmethod_section_label as well. 2895 if (AbstractDisassembler::show_block_comment()) { 2896 print_block_comment(st, p); 2897 if (st->position() == 0) { 2898 compressed_format_idx = 0; 2899 } 2900 } 2901 2902 //---< New location information after line break >--- 2903 if (compressed_format_idx == 0) { 2904 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2905 compressed_format_idx = 1; 2906 } 2907 2908 //---< Code comment for current instruction. Address range [p..(p+len)) >--- 2909 unsigned char* p_end = p + (ssize_t)instruction_size_in_bytes; 2910 S390_ONLY(if (p_end > end) p_end = end;) // avoid getting past the end 2911 2912 if (AbstractDisassembler::show_comment() && const_cast<nmethod*>(this)->has_code_comment(p, p_end)) { 2913 //---< interrupt instruction byte stream for code comment >--- 2914 if (compressed_format_idx > 1) { 2915 st->cr(); // interrupt byte stream 2916 st->cr(); // add an empty line 2917 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2918 } 2919 const_cast<nmethod*>(this)->print_code_comment_on(st, code_comment_column, p, p_end ); 2920 st->bol(); 2921 compressed_format_idx = 0; 2922 } 2923 2924 //---< New location information after line break >--- 2925 if (compressed_format_idx == 0) { 2926 code_comment_column = Disassembler::print_location(p, pss, end, st, false, false); 2927 compressed_format_idx = 1; 2928 } 2929 2930 //---< Nicely align instructions for readability >--- 2931 if (compressed_format_idx > 1) { 2932 Disassembler::print_delimiter(st); 2933 } 2934 2935 //---< Now, finally, print the actual instruction bytes >--- 2936 unsigned char* p0 = p; 2937 p = Disassembler::decode_instruction_abstract(p, st, instruction_size_in_bytes, instr_maxlen); 2938 compressed_format_idx += p - p0; 2939 2940 if (Disassembler::start_newline(compressed_format_idx-1)) { 2941 st->cr(); 2942 compressed_format_idx = 0; 2943 } 2944 } 2945 //---< Close the output (Marker for post-mortem disassembler) >--- 2946 st->bol(); 2947 st->print_cr("[/MachCode]"); 2948 return; 2949 } 2950 #endif 2951 } 2952 2953 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY) 2954 2955 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2956 RelocIterator iter(this, begin, end); 2957 bool have_one = false; 2958 while (iter.next()) { 2959 have_one = true; 2960 switch (iter.type()) { 2961 case relocInfo::none: return "no_reloc"; 2962 case relocInfo::oop_type: { 2963 // Get a non-resizable resource-allocated stringStream. 2964 // Our callees make use of (nested) ResourceMarks. 2965 stringStream st(NEW_RESOURCE_ARRAY(char, 1024), 1024); 2966 oop_Relocation* r = iter.oop_reloc(); 2967 oop obj = r->oop_value(); 2968 st.print("oop("); 2969 if (obj == NULL) st.print("NULL"); 2970 else obj->print_value_on(&st); 2971 st.print(")"); 2972 return st.as_string(); 2973 } 2974 case relocInfo::metadata_type: { 2975 stringStream st; 2976 metadata_Relocation* r = iter.metadata_reloc(); 2977 Metadata* obj = r->metadata_value(); 2978 st.print("metadata("); 2979 if (obj == NULL) st.print("NULL"); 2980 else obj->print_value_on(&st); 2981 st.print(")"); 2982 return st.as_string(); 2983 } 2984 case relocInfo::runtime_call_type: 2985 case relocInfo::runtime_call_w_cp_type: { 2986 stringStream st; 2987 st.print("runtime_call"); 2988 CallRelocation* r = (CallRelocation*)iter.reloc(); 2989 address dest = r->destination(); 2990 CodeBlob* cb = CodeCache::find_blob(dest); 2991 if (cb != NULL) { 2992 st.print(" %s", cb->name()); 2993 } else { 2994 ResourceMark rm; 2995 const int buflen = 1024; 2996 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2997 int offset; 2998 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2999 st.print(" %s", buf); 3000 if (offset != 0) { 3001 st.print("+%d", offset); 3002 } 3003 } 3004 } 3005 return st.as_string(); 3006 } 3007 case relocInfo::virtual_call_type: { 3008 stringStream st; 3009 st.print_raw("virtual_call"); 3010 virtual_call_Relocation* r = iter.virtual_call_reloc(); 3011 Method* m = r->method_value(); 3012 if (m != NULL) { 3013 assert(m->is_method(), ""); 3014 m->print_short_name(&st); 3015 } 3016 return st.as_string(); 3017 } 3018 case relocInfo::opt_virtual_call_type: { 3019 stringStream st; 3020 st.print_raw("optimized virtual_call"); 3021 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 3022 Method* m = r->method_value(); 3023 if (m != NULL) { 3024 assert(m->is_method(), ""); 3025 m->print_short_name(&st); 3026 } 3027 return st.as_string(); 3028 } 3029 case relocInfo::static_call_type: { 3030 stringStream st; 3031 st.print_raw("static_call"); 3032 static_call_Relocation* r = iter.static_call_reloc(); 3033 Method* m = r->method_value(); 3034 if (m != NULL) { 3035 assert(m->is_method(), ""); 3036 m->print_short_name(&st); 3037 } 3038 return st.as_string(); 3039 } 3040 case relocInfo::static_stub_type: return "static_stub"; 3041 case relocInfo::external_word_type: return "external_word"; 3042 case relocInfo::internal_word_type: return "internal_word"; 3043 case relocInfo::section_word_type: return "section_word"; 3044 case relocInfo::poll_type: return "poll"; 3045 case relocInfo::poll_return_type: return "poll_return"; 3046 case relocInfo::trampoline_stub_type: return "trampoline_stub"; 3047 case relocInfo::type_mask: return "type_bit_mask"; 3048 3049 default: 3050 break; 3051 } 3052 } 3053 return have_one ? "other" : NULL; 3054 } 3055 3056 // Return a the last scope in (begin..end] 3057 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3058 PcDesc* p = pc_desc_near(begin+1); 3059 if (p != NULL && p->real_pc(this) <= end) { 3060 return new ScopeDesc(this, p->scope_decode_offset(), 3061 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3062 p->return_oop()); 3063 } 3064 return NULL; 3065 } 3066 3067 const char* nmethod::nmethod_section_label(address pos) const { 3068 const char* label = NULL; 3069 if (pos == code_begin()) label = "[Instructions begin]"; 3070 if (pos == entry_point()) label = "[Entry Point]"; 3071 if (pos == verified_entry_point()) label = "[Verified Entry Point]"; 3072 if (has_method_handle_invokes() && (pos == deopt_mh_handler_begin())) label = "[Deopt MH Handler Code]"; 3073 if (pos == consts_begin() && pos != insts_begin()) label = "[Constants]"; 3074 // Check stub_code before checking exception_handler or deopt_handler. 3075 if (pos == this->stub_begin()) label = "[Stub Code]"; 3076 if (JVMCI_ONLY(_exception_offset >= 0 &&) pos == exception_begin()) label = "[Exception Handler]"; 3077 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) pos == deopt_handler_begin()) label = "[Deopt Handler Code]"; 3078 return label; 3079 } 3080 3081 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin, bool print_section_labels) const { 3082 if (print_section_labels) { 3083 const char* label = nmethod_section_label(block_begin); 3084 if (label != NULL) { 3085 stream->bol(); 3086 stream->print_cr("%s", label); 3087 } 3088 } 3089 3090 if (block_begin == entry_point()) { 3091 Method* m = method(); 3092 if (m != NULL) { 3093 stream->print(" # "); 3094 m->print_value_on(stream); 3095 stream->cr(); 3096 } 3097 if (m != NULL && !is_osr_method()) { 3098 ResourceMark rm; 3099 int sizeargs = m->size_of_parameters(); 3100 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3101 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3102 { 3103 int sig_index = 0; 3104 if (!m->is_static()) 3105 sig_bt[sig_index++] = T_OBJECT; // 'this' 3106 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3107 BasicType t = ss.type(); 3108 sig_bt[sig_index++] = t; 3109 if (type2size[t] == 2) { 3110 sig_bt[sig_index++] = T_VOID; 3111 } else { 3112 assert(type2size[t] == 1, "size is 1 or 2"); 3113 } 3114 } 3115 assert(sig_index == sizeargs, ""); 3116 } 3117 const char* spname = "sp"; // make arch-specific? 3118 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3119 int stack_slot_offset = this->frame_size() * wordSize; 3120 int tab1 = 14, tab2 = 24; 3121 int sig_index = 0; 3122 int arg_index = (m->is_static() ? 0 : -1); 3123 bool did_old_sp = false; 3124 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3125 bool at_this = (arg_index == -1); 3126 bool at_old_sp = false; 3127 BasicType t = (at_this ? T_OBJECT : ss.type()); 3128 assert(t == sig_bt[sig_index], "sigs in sync"); 3129 if (at_this) 3130 stream->print(" # this: "); 3131 else 3132 stream->print(" # parm%d: ", arg_index); 3133 stream->move_to(tab1); 3134 VMReg fst = regs[sig_index].first(); 3135 VMReg snd = regs[sig_index].second(); 3136 if (fst->is_reg()) { 3137 stream->print("%s", fst->name()); 3138 if (snd->is_valid()) { 3139 stream->print(":%s", snd->name()); 3140 } 3141 } else if (fst->is_stack()) { 3142 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3143 if (offset == stack_slot_offset) at_old_sp = true; 3144 stream->print("[%s+0x%x]", spname, offset); 3145 } else { 3146 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3147 } 3148 stream->print(" "); 3149 stream->move_to(tab2); 3150 stream->print("= "); 3151 if (at_this) { 3152 m->method_holder()->print_value_on(stream); 3153 } else { 3154 bool did_name = false; 3155 if (!at_this && ss.is_reference()) { 3156 Symbol* name = ss.as_symbol(); 3157 name->print_value_on(stream); 3158 did_name = true; 3159 } 3160 if (!did_name) 3161 stream->print("%s", type2name(t)); 3162 } 3163 if (at_old_sp) { 3164 stream->print(" (%s of caller)", spname); 3165 did_old_sp = true; 3166 } 3167 stream->cr(); 3168 sig_index += type2size[t]; 3169 arg_index += 1; 3170 if (!at_this) ss.next(); 3171 } 3172 if (!did_old_sp) { 3173 stream->print(" # "); 3174 stream->move_to(tab1); 3175 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3176 stream->print(" (%s of caller)", spname); 3177 stream->cr(); 3178 } 3179 } 3180 } 3181 } 3182 3183 // Returns whether this nmethod has code comments. 3184 bool nmethod::has_code_comment(address begin, address end) { 3185 // scopes? 3186 ScopeDesc* sd = scope_desc_in(begin, end); 3187 if (sd != NULL) return true; 3188 3189 // relocations? 3190 const char* str = reloc_string_for(begin, end); 3191 if (str != NULL) return true; 3192 3193 // implicit exceptions? 3194 int cont_offset = ImplicitExceptionTable(this).continuation_offset(begin - code_begin()); 3195 if (cont_offset != 0) return true; 3196 3197 return false; 3198 } 3199 3200 void nmethod::print_code_comment_on(outputStream* st, int column, address begin, address end) { 3201 ImplicitExceptionTable implicit_table(this); 3202 int pc_offset = begin - code_begin(); 3203 int cont_offset = implicit_table.continuation_offset(pc_offset); 3204 bool oop_map_required = false; 3205 if (cont_offset != 0) { 3206 st->move_to(column, 6, 0); 3207 if (pc_offset == cont_offset) { 3208 st->print("; implicit exception: deoptimizes"); 3209 oop_map_required = true; 3210 } else { 3211 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3212 } 3213 } 3214 3215 // Find an oopmap in (begin, end]. We use the odd half-closed 3216 // interval so that oop maps and scope descs which are tied to the 3217 // byte after a call are printed with the call itself. OopMaps 3218 // associated with implicit exceptions are printed with the implicit 3219 // instruction. 3220 address base = code_begin(); 3221 ImmutableOopMapSet* oms = oop_maps(); 3222 if (oms != NULL) { 3223 for (int i = 0, imax = oms->count(); i < imax; i++) { 3224 const ImmutableOopMapPair* pair = oms->pair_at(i); 3225 const ImmutableOopMap* om = pair->get_from(oms); 3226 address pc = base + pair->pc_offset(); 3227 if (pc >= begin) { 3228 #if INCLUDE_JVMCI 3229 bool is_implicit_deopt = implicit_table.continuation_offset(pair->pc_offset()) == (uint) pair->pc_offset(); 3230 #else 3231 bool is_implicit_deopt = false; 3232 #endif 3233 if (is_implicit_deopt ? pc == begin : pc > begin && pc <= end) { 3234 st->move_to(column, 6, 0); 3235 st->print("; "); 3236 om->print_on(st); 3237 oop_map_required = false; 3238 } 3239 } 3240 if (pc > end) { 3241 break; 3242 } 3243 } 3244 } 3245 assert(!oop_map_required, "missed oopmap"); 3246 3247 Thread* thread = Thread::current(); 3248 3249 // Print any debug info present at this pc. 3250 ScopeDesc* sd = scope_desc_in(begin, end); 3251 if (sd != NULL) { 3252 st->move_to(column, 6, 0); 3253 if (sd->bci() == SynchronizationEntryBCI) { 3254 st->print(";*synchronization entry"); 3255 } else if (sd->bci() == AfterBci) { 3256 st->print(";* method exit (unlocked if synchronized)"); 3257 } else if (sd->bci() == UnwindBci) { 3258 st->print(";* unwind (locked if synchronized)"); 3259 } else if (sd->bci() == AfterExceptionBci) { 3260 st->print(";* unwind (unlocked if synchronized)"); 3261 } else if (sd->bci() == UnknownBci) { 3262 st->print(";* unknown"); 3263 } else if (sd->bci() == InvalidFrameStateBci) { 3264 st->print(";* invalid frame state"); 3265 } else { 3266 if (sd->method() == NULL) { 3267 st->print("method is NULL"); 3268 } else if (sd->method()->is_native()) { 3269 st->print("method is native"); 3270 } else { 3271 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3272 st->print(";*%s", Bytecodes::name(bc)); 3273 switch (bc) { 3274 case Bytecodes::_invokevirtual: 3275 case Bytecodes::_invokespecial: 3276 case Bytecodes::_invokestatic: 3277 case Bytecodes::_invokeinterface: 3278 { 3279 Bytecode_invoke invoke(methodHandle(thread, sd->method()), sd->bci()); 3280 st->print(" "); 3281 if (invoke.name() != NULL) 3282 invoke.name()->print_symbol_on(st); 3283 else 3284 st->print("<UNKNOWN>"); 3285 break; 3286 } 3287 case Bytecodes::_getfield: 3288 case Bytecodes::_putfield: 3289 case Bytecodes::_getstatic: 3290 case Bytecodes::_putstatic: 3291 { 3292 Bytecode_field field(methodHandle(thread, sd->method()), sd->bci()); 3293 st->print(" "); 3294 if (field.name() != NULL) 3295 field.name()->print_symbol_on(st); 3296 else 3297 st->print("<UNKNOWN>"); 3298 } 3299 default: 3300 break; 3301 } 3302 } 3303 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3304 } 3305 3306 // Print all scopes 3307 for (;sd != NULL; sd = sd->sender()) { 3308 st->move_to(column, 6, 0); 3309 st->print("; -"); 3310 if (sd->should_reexecute()) { 3311 st->print(" (reexecute)"); 3312 } 3313 if (sd->method() == NULL) { 3314 st->print("method is NULL"); 3315 } else { 3316 sd->method()->print_short_name(st); 3317 } 3318 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3319 if (lineno != -1) { 3320 st->print("@%d (line %d)", sd->bci(), lineno); 3321 } else { 3322 st->print("@%d", sd->bci()); 3323 } 3324 st->cr(); 3325 } 3326 } 3327 3328 // Print relocation information 3329 // Prevent memory leak: allocating without ResourceMark. 3330 ResourceMark rm; 3331 const char* str = reloc_string_for(begin, end); 3332 if (str != NULL) { 3333 if (sd != NULL) st->cr(); 3334 st->move_to(column, 6, 0); 3335 st->print("; {%s}", str); 3336 } 3337 } 3338 3339 #endif 3340 3341 class DirectNativeCallWrapper: public NativeCallWrapper { 3342 private: 3343 NativeCall* _call; 3344 3345 public: 3346 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 3347 3348 virtual address destination() const { return _call->destination(); } 3349 virtual address instruction_address() const { return _call->instruction_address(); } 3350 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 3351 virtual address return_address() const { return _call->return_address(); } 3352 3353 virtual address get_resolve_call_stub(bool is_optimized) const { 3354 if (is_optimized) { 3355 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 3356 } 3357 return SharedRuntime::get_resolve_virtual_call_stub(); 3358 } 3359 3360 virtual void set_destination_mt_safe(address dest) { 3361 #if INCLUDE_AOT 3362 if (UseAOT) { 3363 CodeBlob* callee = CodeCache::find_blob(dest); 3364 CompiledMethod* cm = callee->as_compiled_method_or_null(); 3365 if (cm != NULL && cm->is_far_code()) { 3366 // Temporary fix, see JDK-8143106 3367 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3368 csc->set_to_far(methodHandle(Thread::current(), cm->method()), dest); 3369 return; 3370 } 3371 } 3372 #endif 3373 _call->set_destination_mt_safe(dest); 3374 } 3375 3376 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 3377 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 3378 #if INCLUDE_AOT 3379 if (info.to_aot()) { 3380 csc->set_to_far(method, info.entry()); 3381 } else 3382 #endif 3383 { 3384 csc->set_to_interpreted(method, info.entry()); 3385 } 3386 } 3387 3388 virtual void verify() const { 3389 // make sure code pattern is actually a call imm32 instruction 3390 _call->verify(); 3391 _call->verify_alignment(); 3392 } 3393 3394 virtual void verify_resolve_call(address dest) const { 3395 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 3396 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 3397 } 3398 3399 virtual bool is_call_to_interpreted(address dest) const { 3400 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 3401 return cb->contains(dest); 3402 } 3403 3404 virtual bool is_safe_for_patching() const { return false; } 3405 3406 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 3407 return nativeMovConstReg_at(r->cached_value()); 3408 } 3409 3410 virtual void *get_data(NativeInstruction* instruction) const { 3411 return (void*)((NativeMovConstReg*) instruction)->data(); 3412 } 3413 3414 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 3415 ((NativeMovConstReg*) instruction)->set_data(data); 3416 } 3417 }; 3418 3419 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 3420 return new DirectNativeCallWrapper((NativeCall*) call); 3421 } 3422 3423 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 3424 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 3425 } 3426 3427 address nmethod::call_instruction_address(address pc) const { 3428 if (NativeCall::is_call_before(pc)) { 3429 NativeCall *ncall = nativeCall_before(pc); 3430 return ncall->instruction_address(); 3431 } 3432 return NULL; 3433 } 3434 3435 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 3436 return CompiledDirectStaticCall::at(call_site); 3437 } 3438 3439 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 3440 return CompiledDirectStaticCall::at(call_site); 3441 } 3442 3443 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 3444 return CompiledDirectStaticCall::before(return_addr); 3445 } 3446 3447 #if defined(SUPPORT_DATA_STRUCTS) 3448 void nmethod::print_value_on(outputStream* st) const { 3449 st->print("nmethod"); 3450 print_on(st, NULL); 3451 } 3452 #endif 3453 3454 #ifndef PRODUCT 3455 3456 void nmethod::print_calls(outputStream* st) { 3457 RelocIterator iter(this); 3458 while (iter.next()) { 3459 switch (iter.type()) { 3460 case relocInfo::virtual_call_type: 3461 case relocInfo::opt_virtual_call_type: { 3462 CompiledICLocker ml_verify(this); 3463 CompiledIC_at(&iter)->print(); 3464 break; 3465 } 3466 case relocInfo::static_call_type: 3467 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3468 CompiledDirectStaticCall::at(iter.reloc())->print(); 3469 break; 3470 default: 3471 break; 3472 } 3473 } 3474 } 3475 3476 void nmethod::print_statistics() { 3477 ttyLocker ttyl; 3478 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3479 native_nmethod_stats.print_native_nmethod_stats(); 3480 #ifdef COMPILER1 3481 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3482 #endif 3483 #ifdef COMPILER2 3484 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3485 #endif 3486 #if INCLUDE_JVMCI 3487 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3488 #endif 3489 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3490 DebugInformationRecorder::print_statistics(); 3491 #ifndef PRODUCT 3492 pc_nmethod_stats.print_pc_stats(); 3493 #endif 3494 Dependencies::print_statistics(); 3495 if (xtty != NULL) xtty->tail("statistics"); 3496 } 3497 3498 #endif // !PRODUCT 3499 3500 #if INCLUDE_JVMCI 3501 void nmethod::update_speculation(JavaThread* thread) { 3502 jlong speculation = thread->pending_failed_speculation(); 3503 if (speculation != 0) { 3504 guarantee(jvmci_nmethod_data() != NULL, "failed speculation in nmethod without failed speculation list"); 3505 jvmci_nmethod_data()->add_failed_speculation(this, speculation); 3506 thread->set_pending_failed_speculation(0); 3507 } 3508 } 3509 3510 const char* nmethod::jvmci_name() { 3511 if (jvmci_nmethod_data() != NULL) { 3512 return jvmci_nmethod_data()->name(); 3513 } 3514 return NULL; 3515 } 3516 #endif