1 /* 2 * Copyright (c) 1997, 2017, 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 "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nmethod.hpp" 30 #include "code/scopeDesc.hpp" 31 #include "compiler/abstractCompiler.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/compileLog.hpp" 34 #include "compiler/compilerOracle.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/bytecode.hpp" 37 #include "oops/methodData.hpp" 38 #include "prims/jvmtiRedefineClassesTrace.hpp" 39 #include "prims/jvmtiImpl.hpp" 40 #include "runtime/orderAccess.inline.hpp" 41 #include "runtime/sharedRuntime.hpp" 42 #include "runtime/sweeper.hpp" 43 #include "utilities/dtrace.hpp" 44 #include "utilities/events.hpp" 45 #include "utilities/xmlstream.hpp" 46 #ifdef SHARK 47 #include "shark/sharkCompiler.hpp" 48 #endif 49 50 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 51 52 unsigned char nmethod::_global_unloading_clock = 0; 53 54 #ifdef DTRACE_ENABLED 55 56 // Only bother with this argument setup if dtrace is available 57 58 #ifndef USDT2 59 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, 60 const char*, int, const char*, int, const char*, int, void*, size_t); 61 62 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, 63 char*, int, char*, int, char*, int); 64 65 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 66 { \ 67 Method* m = (method); \ 68 if (m != NULL) { \ 69 Symbol* klass_name = m->klass_name(); \ 70 Symbol* name = m->name(); \ 71 Symbol* signature = m->signature(); \ 72 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ 73 klass_name->bytes(), klass_name->utf8_length(), \ 74 name->bytes(), name->utf8_length(), \ 75 signature->bytes(), signature->utf8_length()); \ 76 } \ 77 } 78 #else /* USDT2 */ 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 #endif /* USDT2 */ 93 94 #else // ndef DTRACE_ENABLED 95 96 #define DTRACE_METHOD_UNLOAD_PROBE(method) 97 98 #endif 99 100 bool nmethod::is_compiled_by_c1() const { 101 if (compiler() == NULL) { 102 return false; 103 } 104 return compiler()->is_c1(); 105 } 106 bool nmethod::is_compiled_by_c2() const { 107 if (compiler() == NULL) { 108 return false; 109 } 110 return compiler()->is_c2(); 111 } 112 bool nmethod::is_compiled_by_shark() const { 113 if (compiler() == NULL) { 114 return false; 115 } 116 return compiler()->is_shark(); 117 } 118 119 120 121 //--------------------------------------------------------------------------------- 122 // NMethod statistics 123 // They are printed under various flags, including: 124 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 125 // (In the latter two cases, they like other stats are printed to the log only.) 126 127 #ifndef PRODUCT 128 // These variables are put into one block to reduce relocations 129 // and make it simpler to print from the debugger. 130 static 131 struct nmethod_stats_struct { 132 int nmethod_count; 133 int total_size; 134 int relocation_size; 135 int consts_size; 136 int insts_size; 137 int stub_size; 138 int scopes_data_size; 139 int scopes_pcs_size; 140 int dependencies_size; 141 int handler_table_size; 142 int nul_chk_table_size; 143 int oops_size; 144 145 void note_nmethod(nmethod* nm) { 146 nmethod_count += 1; 147 total_size += nm->size(); 148 relocation_size += nm->relocation_size(); 149 consts_size += nm->consts_size(); 150 insts_size += nm->insts_size(); 151 stub_size += nm->stub_size(); 152 oops_size += nm->oops_size(); 153 scopes_data_size += nm->scopes_data_size(); 154 scopes_pcs_size += nm->scopes_pcs_size(); 155 dependencies_size += nm->dependencies_size(); 156 handler_table_size += nm->handler_table_size(); 157 nul_chk_table_size += nm->nul_chk_table_size(); 158 } 159 void print_nmethod_stats() { 160 if (nmethod_count == 0) return; 161 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 162 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 163 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 164 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 165 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 166 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 167 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 168 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 169 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 170 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 171 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 172 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 173 } 174 175 int native_nmethod_count; 176 int native_total_size; 177 int native_relocation_size; 178 int native_insts_size; 179 int native_oops_size; 180 void note_native_nmethod(nmethod* nm) { 181 native_nmethod_count += 1; 182 native_total_size += nm->size(); 183 native_relocation_size += nm->relocation_size(); 184 native_insts_size += nm->insts_size(); 185 native_oops_size += nm->oops_size(); 186 } 187 void print_native_nmethod_stats() { 188 if (native_nmethod_count == 0) return; 189 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 190 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 191 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 192 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 193 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 194 } 195 196 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 } nmethod_stats; 217 #endif //PRODUCT 218 219 220 //--------------------------------------------------------------------------------- 221 222 223 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 224 assert(pc != NULL, "Must be non null"); 225 assert(exception.not_null(), "Must be non null"); 226 assert(handler != NULL, "Must be non null"); 227 228 _count = 0; 229 _exception_type = exception->klass(); 230 _next = NULL; 231 232 add_address_and_handler(pc,handler); 233 } 234 235 236 address ExceptionCache::match(Handle exception, address pc) { 237 assert(pc != NULL,"Must be non null"); 238 assert(exception.not_null(),"Must be non null"); 239 if (exception->klass() == exception_type()) { 240 return (test_address(pc)); 241 } 242 243 return NULL; 244 } 245 246 247 bool ExceptionCache::match_exception_with_space(Handle exception) { 248 assert(exception.not_null(),"Must be non null"); 249 if (exception->klass() == exception_type() && count() < cache_size) { 250 return true; 251 } 252 return false; 253 } 254 255 256 address ExceptionCache::test_address(address addr) { 257 int limit = count(); 258 for (int i = 0; i < limit; i++) { 259 if (pc_at(i) == addr) { 260 return handler_at(i); 261 } 262 } 263 return NULL; 264 } 265 266 267 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 268 if (test_address(addr) == handler) return true; 269 270 int index = count(); 271 if (index < cache_size) { 272 set_pc_at(index, addr); 273 set_handler_at(index, handler); 274 increment_count(); 275 return true; 276 } 277 return false; 278 } 279 280 281 // private method for handling exception cache 282 // These methods are private, and used to manipulate the exception cache 283 // directly. 284 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 285 ExceptionCache* ec = exception_cache(); 286 while (ec != NULL) { 287 if (ec->match_exception_with_space(exception)) { 288 return ec; 289 } 290 ec = ec->next(); 291 } 292 return NULL; 293 } 294 295 296 //----------------------------------------------------------------------------- 297 298 299 // Helper used by both find_pc_desc methods. 300 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 301 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 302 if (!approximate) 303 return pc->pc_offset() == pc_offset; 304 else 305 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 306 } 307 308 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 309 if (initial_pc_desc == NULL) { 310 _pc_descs[0] = NULL; // native method; no PcDescs at all 311 return; 312 } 313 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 314 // reset the cache by filling it with benign (non-null) values 315 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 316 for (int i = 0; i < cache_size; i++) 317 _pc_descs[i] = initial_pc_desc; 318 } 319 320 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 321 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 322 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 323 324 // Note: one might think that caching the most recently 325 // read value separately would be a win, but one would be 326 // wrong. When many threads are updating it, the cache 327 // line it's in would bounce between caches, negating 328 // any benefit. 329 330 // In order to prevent race conditions do not load cache elements 331 // repeatedly, but use a local copy: 332 PcDesc* res; 333 334 // Step one: Check the most recently added value. 335 res = _pc_descs[0]; 336 if (res == NULL) return NULL; // native method; no PcDescs at all 337 if (match_desc(res, pc_offset, approximate)) { 338 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 339 return res; 340 } 341 342 // Step two: Check the rest of the LRU cache. 343 for (int i = 1; i < cache_size; ++i) { 344 res = _pc_descs[i]; 345 if (res->pc_offset() < 0) break; // optimization: skip empty cache 346 if (match_desc(res, pc_offset, approximate)) { 347 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 348 return res; 349 } 350 } 351 352 // Report failure. 353 return NULL; 354 } 355 356 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 357 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 358 // Update the LRU cache by shifting pc_desc forward. 359 for (int i = 0; i < cache_size; i++) { 360 PcDesc* next = _pc_descs[i]; 361 _pc_descs[i] = pc_desc; 362 pc_desc = next; 363 } 364 } 365 366 // adjust pcs_size so that it is a multiple of both oopSize and 367 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 368 // of oopSize, then 2*sizeof(PcDesc) is) 369 static int adjust_pcs_size(int pcs_size) { 370 int nsize = round_to(pcs_size, oopSize); 371 if ((nsize % sizeof(PcDesc)) != 0) { 372 nsize = pcs_size + sizeof(PcDesc); 373 } 374 assert((nsize % oopSize) == 0, "correct alignment"); 375 return nsize; 376 } 377 378 //----------------------------------------------------------------------------- 379 380 381 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 382 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 383 assert(new_entry != NULL,"Must be non null"); 384 assert(new_entry->next() == NULL, "Must be null"); 385 386 ExceptionCache *ec = exception_cache(); 387 if (ec != NULL) { 388 new_entry->set_next(ec); 389 } 390 release_set_exception_cache(new_entry); 391 } 392 393 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 394 ExceptionCache* prev = NULL; 395 ExceptionCache* curr = exception_cache(); 396 397 while (curr != NULL) { 398 ExceptionCache* next = curr->next(); 399 400 Klass* ex_klass = curr->exception_type(); 401 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 402 if (prev == NULL) { 403 set_exception_cache(next); 404 } else { 405 prev->set_next(next); 406 } 407 delete curr; 408 // prev stays the same. 409 } else { 410 prev = curr; 411 } 412 413 curr = next; 414 } 415 } 416 417 // public method for accessing the exception cache 418 // These are the public access methods. 419 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 420 // We never grab a lock to read the exception cache, so we may 421 // have false negatives. This is okay, as it can only happen during 422 // the first few exception lookups for a given nmethod. 423 ExceptionCache* ec = exception_cache(); 424 while (ec != NULL) { 425 address ret_val; 426 if ((ret_val = ec->match(exception,pc)) != NULL) { 427 return ret_val; 428 } 429 ec = ec->next(); 430 } 431 return NULL; 432 } 433 434 435 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 436 // There are potential race conditions during exception cache updates, so we 437 // must own the ExceptionCache_lock before doing ANY modifications. Because 438 // we don't lock during reads, it is possible to have several threads attempt 439 // to update the cache with the same data. We need to check for already inserted 440 // copies of the current data before adding it. 441 442 MutexLocker ml(ExceptionCache_lock); 443 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 444 445 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 446 target_entry = new ExceptionCache(exception,pc,handler); 447 add_exception_cache_entry(target_entry); 448 } 449 } 450 451 452 //-------------end of code for ExceptionCache-------------- 453 454 455 int nmethod::total_size() const { 456 return 457 consts_size() + 458 insts_size() + 459 stub_size() + 460 scopes_data_size() + 461 scopes_pcs_size() + 462 handler_table_size() + 463 nul_chk_table_size(); 464 } 465 466 const char* nmethod::compile_kind() const { 467 if (is_osr_method()) return "osr"; 468 if (method() != NULL && is_native_method()) return "c2n"; 469 return NULL; 470 } 471 472 // Fill in default values for various flag fields 473 void nmethod::init_defaults() { 474 _state = in_use; 475 _unloading_clock = 0; 476 _marked_for_reclamation = 0; 477 _has_flushed_dependencies = 0; 478 _has_unsafe_access = 0; 479 _has_method_handle_invokes = 0; 480 _lazy_critical_native = 0; 481 _has_wide_vectors = 0; 482 _marked_for_deoptimization = 0; 483 _lock_count = 0; 484 _stack_traversal_mark = 0; 485 _unload_reported = false; // jvmti state 486 487 #ifdef ASSERT 488 _oops_are_stale = false; 489 #endif 490 491 _oops_do_mark_link = NULL; 492 _jmethod_id = NULL; 493 _osr_link = NULL; 494 if (UseG1GC) { 495 _unloading_next = NULL; 496 } else { 497 _scavenge_root_link = NULL; 498 } 499 _scavenge_root_state = 0; 500 _compiler = NULL; 501 #if INCLUDE_RTM_OPT 502 _rtm_state = NoRTM; 503 #endif 504 #ifdef HAVE_DTRACE_H 505 _trap_offset = 0; 506 #endif // def HAVE_DTRACE_H 507 } 508 509 nmethod* nmethod::new_native_nmethod(methodHandle method, 510 int compile_id, 511 CodeBuffer *code_buffer, 512 int vep_offset, 513 int frame_complete, 514 int frame_size, 515 ByteSize basic_lock_owner_sp_offset, 516 ByteSize basic_lock_sp_offset, 517 OopMapSet* oop_maps) { 518 code_buffer->finalize_oop_references(method); 519 // create nmethod 520 nmethod* nm = NULL; 521 { 522 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 523 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 524 CodeOffsets offsets; 525 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 526 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 527 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size, 528 compile_id, &offsets, 529 code_buffer, frame_size, 530 basic_lock_owner_sp_offset, 531 basic_lock_sp_offset, oop_maps); 532 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 533 if (PrintAssembly && nm != NULL) { 534 Disassembler::decode(nm); 535 } 536 } 537 // verify nmethod 538 debug_only(if (nm) nm->verify();) // might block 539 540 if (nm != NULL) { 541 nm->log_new_nmethod(); 542 } 543 544 return nm; 545 } 546 547 #ifdef HAVE_DTRACE_H 548 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 549 CodeBuffer *code_buffer, 550 int vep_offset, 551 int trap_offset, 552 int frame_complete, 553 int frame_size) { 554 code_buffer->finalize_oop_references(method); 555 // create nmethod 556 nmethod* nm = NULL; 557 { 558 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 559 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 560 CodeOffsets offsets; 561 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 562 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 563 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 564 565 nm = new (nmethod_size) nmethod(method(), nmethod_size, 566 &offsets, code_buffer, frame_size); 567 568 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 569 if (PrintAssembly && nm != NULL) { 570 Disassembler::decode(nm); 571 } 572 } 573 // verify nmethod 574 debug_only(if (nm) nm->verify();) // might block 575 576 if (nm != NULL) { 577 nm->log_new_nmethod(); 578 } 579 580 return nm; 581 } 582 583 #endif // def HAVE_DTRACE_H 584 585 nmethod* nmethod::new_nmethod(methodHandle method, 586 int compile_id, 587 int entry_bci, 588 CodeOffsets* offsets, 589 int orig_pc_offset, 590 DebugInformationRecorder* debug_info, 591 Dependencies* dependencies, 592 CodeBuffer* code_buffer, int frame_size, 593 OopMapSet* oop_maps, 594 ExceptionHandlerTable* handler_table, 595 ImplicitExceptionTable* nul_chk_table, 596 AbstractCompiler* compiler, 597 int comp_level 598 ) 599 { 600 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 601 code_buffer->finalize_oop_references(method); 602 // create nmethod 603 nmethod* nm = NULL; 604 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 605 int nmethod_size = 606 allocation_size(code_buffer, sizeof(nmethod)) 607 + adjust_pcs_size(debug_info->pcs_size()) 608 + round_to(dependencies->size_in_bytes() , oopSize) 609 + round_to(handler_table->size_in_bytes(), oopSize) 610 + round_to(nul_chk_table->size_in_bytes(), oopSize) 611 + round_to(debug_info->data_size() , oopSize); 612 613 nm = new (nmethod_size) 614 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 615 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 616 oop_maps, 617 handler_table, 618 nul_chk_table, 619 compiler, 620 comp_level); 621 622 if (nm != NULL) { 623 // To make dependency checking during class loading fast, record 624 // the nmethod dependencies in the classes it is dependent on. 625 // This allows the dependency checking code to simply walk the 626 // class hierarchy above the loaded class, checking only nmethods 627 // which are dependent on those classes. The slow way is to 628 // check every nmethod for dependencies which makes it linear in 629 // the number of methods compiled. For applications with a lot 630 // classes the slow way is too slow. 631 for (Dependencies::DepStream deps(nm); deps.next(); ) { 632 Klass* klass = deps.context_type(); 633 if (klass == NULL) { 634 continue; // ignore things like evol_method 635 } 636 637 // record this nmethod as dependent on this klass 638 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 639 } 640 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 641 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 642 Disassembler::decode(nm); 643 } 644 } 645 } 646 // Do verification and logging outside CodeCache_lock. 647 if (nm != NULL) { 648 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 649 DEBUG_ONLY(nm->verify();) 650 nm->log_new_nmethod(); 651 } 652 return nm; 653 } 654 655 656 // For native wrappers 657 nmethod::nmethod( 658 Method* method, 659 int nmethod_size, 660 int compile_id, 661 CodeOffsets* offsets, 662 CodeBuffer* code_buffer, 663 int frame_size, 664 ByteSize basic_lock_owner_sp_offset, 665 ByteSize basic_lock_sp_offset, 666 OopMapSet* oop_maps ) 667 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 668 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 669 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 670 _native_basic_lock_sp_offset(basic_lock_sp_offset) 671 { 672 { 673 debug_only(No_Safepoint_Verifier nsv;) 674 assert_locked_or_safepoint(CodeCache_lock); 675 676 init_defaults(); 677 _method = method; 678 _entry_bci = InvocationEntryBci; 679 // We have no exception handler or deopt handler make the 680 // values something that will never match a pc like the nmethod vtable entry 681 _exception_offset = 0; 682 _deoptimize_offset = 0; 683 _deoptimize_mh_offset = 0; 684 _orig_pc_offset = 0; 685 686 _consts_offset = data_offset(); 687 _stub_offset = data_offset(); 688 _oops_offset = data_offset(); 689 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 690 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 691 _scopes_pcs_offset = _scopes_data_offset; 692 _dependencies_offset = _scopes_pcs_offset; 693 _handler_table_offset = _dependencies_offset; 694 _nul_chk_table_offset = _handler_table_offset; 695 _nmethod_end_offset = _nul_chk_table_offset; 696 _compile_id = compile_id; 697 _comp_level = CompLevel_none; 698 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 699 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 700 _osr_entry_point = NULL; 701 _exception_cache = NULL; 702 _pc_desc_cache.reset_to(NULL); 703 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 704 705 code_buffer->copy_values_to(this); 706 if (ScavengeRootsInCode) { 707 if (detect_scavenge_root_oops()) { 708 CodeCache::add_scavenge_root_nmethod(this); 709 } 710 Universe::heap()->register_nmethod(this); 711 } 712 debug_only(verify_scavenge_root_oops()); 713 CodeCache::commit(this); 714 } 715 716 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 717 ttyLocker ttyl; // keep the following output all in one block 718 // This output goes directly to the tty, not the compiler log. 719 // To enable tools to match it up with the compilation activity, 720 // be sure to tag this tty output with the compile ID. 721 if (xtty != NULL) { 722 xtty->begin_head("print_native_nmethod"); 723 xtty->method(_method); 724 xtty->stamp(); 725 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 726 } 727 // print the header part first 728 print(); 729 // then print the requested information 730 if (PrintNativeNMethods) { 731 print_code(); 732 if (oop_maps != NULL) { 733 oop_maps->print(); 734 } 735 } 736 if (PrintRelocations) { 737 print_relocations(); 738 } 739 if (xtty != NULL) { 740 xtty->tail("print_native_nmethod"); 741 } 742 } 743 } 744 745 // For dtrace wrappers 746 #ifdef HAVE_DTRACE_H 747 nmethod::nmethod( 748 Method* method, 749 int nmethod_size, 750 CodeOffsets* offsets, 751 CodeBuffer* code_buffer, 752 int frame_size) 753 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 754 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 755 _native_receiver_sp_offset(in_ByteSize(-1)), 756 _native_basic_lock_sp_offset(in_ByteSize(-1)) 757 { 758 { 759 debug_only(No_Safepoint_Verifier nsv;) 760 assert_locked_or_safepoint(CodeCache_lock); 761 762 init_defaults(); 763 _method = method; 764 _entry_bci = InvocationEntryBci; 765 // We have no exception handler or deopt handler make the 766 // values something that will never match a pc like the nmethod vtable entry 767 _exception_offset = 0; 768 _deoptimize_offset = 0; 769 _deoptimize_mh_offset = 0; 770 _unwind_handler_offset = -1; 771 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 772 _orig_pc_offset = 0; 773 _consts_offset = data_offset(); 774 _stub_offset = data_offset(); 775 _oops_offset = data_offset(); 776 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 777 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 778 _scopes_pcs_offset = _scopes_data_offset; 779 _dependencies_offset = _scopes_pcs_offset; 780 _handler_table_offset = _dependencies_offset; 781 _nul_chk_table_offset = _handler_table_offset; 782 _nmethod_end_offset = _nul_chk_table_offset; 783 _compile_id = 0; // default 784 _comp_level = CompLevel_none; 785 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 786 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 787 _osr_entry_point = NULL; 788 _exception_cache = NULL; 789 _pc_desc_cache.reset_to(NULL); 790 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 791 792 code_buffer->copy_values_to(this); 793 if (ScavengeRootsInCode) { 794 if (detect_scavenge_root_oops()) { 795 CodeCache::add_scavenge_root_nmethod(this); 796 } 797 Universe::heap()->register_nmethod(this); 798 } 799 DEBUG_ONLY(verify_scavenge_root_oops();) 800 CodeCache::commit(this); 801 } 802 803 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 804 ttyLocker ttyl; // keep the following output all in one block 805 // This output goes directly to the tty, not the compiler log. 806 // To enable tools to match it up with the compilation activity, 807 // be sure to tag this tty output with the compile ID. 808 if (xtty != NULL) { 809 xtty->begin_head("print_dtrace_nmethod"); 810 xtty->method(_method); 811 xtty->stamp(); 812 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 813 } 814 // print the header part first 815 print(); 816 // then print the requested information 817 if (PrintNMethods) { 818 print_code(); 819 } 820 if (PrintRelocations) { 821 print_relocations(); 822 } 823 if (xtty != NULL) { 824 xtty->tail("print_dtrace_nmethod"); 825 } 826 } 827 } 828 #endif // def HAVE_DTRACE_H 829 830 void* nmethod::operator new(size_t size, int nmethod_size) throw() { 831 // Not critical, may return null if there is too little continuous memory 832 return CodeCache::allocate(nmethod_size); 833 } 834 835 nmethod::nmethod( 836 Method* method, 837 int nmethod_size, 838 int compile_id, 839 int entry_bci, 840 CodeOffsets* offsets, 841 int orig_pc_offset, 842 DebugInformationRecorder* debug_info, 843 Dependencies* dependencies, 844 CodeBuffer *code_buffer, 845 int frame_size, 846 OopMapSet* oop_maps, 847 ExceptionHandlerTable* handler_table, 848 ImplicitExceptionTable* nul_chk_table, 849 AbstractCompiler* compiler, 850 int comp_level 851 ) 852 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 853 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 854 _native_receiver_sp_offset(in_ByteSize(-1)), 855 _native_basic_lock_sp_offset(in_ByteSize(-1)) 856 { 857 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 858 { 859 debug_only(No_Safepoint_Verifier nsv;) 860 assert_locked_or_safepoint(CodeCache_lock); 861 862 init_defaults(); 863 _method = method; 864 _entry_bci = entry_bci; 865 _compile_id = compile_id; 866 _comp_level = comp_level; 867 _compiler = compiler; 868 _orig_pc_offset = orig_pc_offset; 869 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 870 871 // Section offsets 872 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 873 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 874 875 // Exception handler and deopt handler are in the stub section 876 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 877 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 878 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 879 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 880 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 881 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 882 } else { 883 _deoptimize_mh_offset = -1; 884 } 885 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 886 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 887 } else { 888 _unwind_handler_offset = -1; 889 } 890 891 _oops_offset = data_offset(); 892 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 893 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 894 895 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 896 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 897 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 898 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 899 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 900 901 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 902 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 903 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 904 _exception_cache = NULL; 905 _pc_desc_cache.reset_to(scopes_pcs_begin()); 906 907 // Copy contents of ScopeDescRecorder to nmethod 908 code_buffer->copy_values_to(this); 909 debug_info->copy_to(this); 910 dependencies->copy_to(this); 911 if (ScavengeRootsInCode) { 912 if (detect_scavenge_root_oops()) { 913 CodeCache::add_scavenge_root_nmethod(this); 914 } 915 Universe::heap()->register_nmethod(this); 916 } 917 debug_only(verify_scavenge_root_oops()); 918 919 CodeCache::commit(this); 920 921 // Copy contents of ExceptionHandlerTable to nmethod 922 handler_table->copy_to(this); 923 nul_chk_table->copy_to(this); 924 925 // we use the information of entry points to find out if a method is 926 // static or non static 927 assert(compiler->is_c2() || 928 _method->is_static() == (entry_point() == _verified_entry_point), 929 " entry points must be same for static methods and vice versa"); 930 } 931 932 bool printnmethods = PrintNMethods 933 || CompilerOracle::should_print(_method) 934 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 935 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 936 print_nmethod(printnmethods); 937 } 938 } 939 940 941 // Print a short set of xml attributes to identify this nmethod. The 942 // output should be embedded in some other element. 943 void nmethod::log_identity(xmlStream* log) const { 944 log->print(" compile_id='%d'", compile_id()); 945 const char* nm_kind = compile_kind(); 946 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 947 if (compiler() != NULL) { 948 log->print(" compiler='%s'", compiler()->name()); 949 } 950 if (TieredCompilation) { 951 log->print(" level='%d'", comp_level()); 952 } 953 } 954 955 956 #define LOG_OFFSET(log, name) \ 957 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 958 log->print(" " XSTR(name) "_offset='%d'" , \ 959 (intptr_t)name##_begin() - (intptr_t)this) 960 961 962 void nmethod::log_new_nmethod() const { 963 if (LogCompilation && xtty != NULL) { 964 ttyLocker ttyl; 965 HandleMark hm; 966 xtty->begin_elem("nmethod"); 967 log_identity(xtty); 968 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 969 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 970 971 LOG_OFFSET(xtty, relocation); 972 LOG_OFFSET(xtty, consts); 973 LOG_OFFSET(xtty, insts); 974 LOG_OFFSET(xtty, stub); 975 LOG_OFFSET(xtty, scopes_data); 976 LOG_OFFSET(xtty, scopes_pcs); 977 LOG_OFFSET(xtty, dependencies); 978 LOG_OFFSET(xtty, handler_table); 979 LOG_OFFSET(xtty, nul_chk_table); 980 LOG_OFFSET(xtty, oops); 981 982 xtty->method(method()); 983 xtty->stamp(); 984 xtty->end_elem(); 985 } 986 } 987 988 #undef LOG_OFFSET 989 990 991 // Print out more verbose output usually for a newly created nmethod. 992 void nmethod::print_on(outputStream* st, const char* msg) const { 993 if (st != NULL) { 994 ttyLocker ttyl; 995 if (WizardMode) { 996 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); 997 st->print_cr(" (" INTPTR_FORMAT ")", this); 998 } else { 999 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); 1000 } 1001 } 1002 } 1003 1004 1005 void nmethod::print_nmethod(bool printmethod) { 1006 ttyLocker ttyl; // keep the following output all in one block 1007 if (xtty != NULL) { 1008 xtty->begin_head("print_nmethod"); 1009 xtty->stamp(); 1010 xtty->end_head(); 1011 } 1012 // print the header part first 1013 print(); 1014 // then print the requested information 1015 if (printmethod) { 1016 print_code(); 1017 print_pcs(); 1018 if (oop_maps()) { 1019 oop_maps()->print(); 1020 } 1021 } 1022 if (PrintDebugInfo) { 1023 print_scopes(); 1024 } 1025 if (PrintRelocations) { 1026 print_relocations(); 1027 } 1028 if (PrintDependencies) { 1029 print_dependencies(); 1030 } 1031 if (PrintExceptionHandlers) { 1032 print_handler_table(); 1033 print_nul_chk_table(); 1034 } 1035 if (xtty != NULL) { 1036 xtty->tail("print_nmethod"); 1037 } 1038 } 1039 1040 1041 // Promote one word from an assembly-time handle to a live embedded oop. 1042 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1043 if (handle == NULL || 1044 // As a special case, IC oops are initialized to 1 or -1. 1045 handle == (jobject) Universe::non_oop_word()) { 1046 (*dest) = (oop) handle; 1047 } else { 1048 (*dest) = JNIHandles::resolve_non_null(handle); 1049 } 1050 } 1051 1052 1053 // Have to have the same name because it's called by a template 1054 void nmethod::copy_values(GrowableArray<jobject>* array) { 1055 int length = array->length(); 1056 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1057 oop* dest = oops_begin(); 1058 for (int index = 0 ; index < length; index++) { 1059 initialize_immediate_oop(&dest[index], array->at(index)); 1060 } 1061 1062 // Now we can fix up all the oops in the code. We need to do this 1063 // in the code because the assembler uses jobjects as placeholders. 1064 // The code and relocations have already been initialized by the 1065 // CodeBlob constructor, so it is valid even at this early point to 1066 // iterate over relocations and patch the code. 1067 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1068 } 1069 1070 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1071 int length = array->length(); 1072 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1073 Metadata** dest = metadata_begin(); 1074 for (int index = 0 ; index < length; index++) { 1075 dest[index] = array->at(index); 1076 } 1077 } 1078 1079 bool nmethod::is_at_poll_return(address pc) { 1080 RelocIterator iter(this, pc, pc+1); 1081 while (iter.next()) { 1082 if (iter.type() == relocInfo::poll_return_type) 1083 return true; 1084 } 1085 return false; 1086 } 1087 1088 1089 bool nmethod::is_at_poll_or_poll_return(address pc) { 1090 RelocIterator iter(this, pc, pc+1); 1091 while (iter.next()) { 1092 relocInfo::relocType t = iter.type(); 1093 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1094 return true; 1095 } 1096 return false; 1097 } 1098 1099 1100 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1101 // re-patch all oop-bearing instructions, just in case some oops moved 1102 RelocIterator iter(this, begin, end); 1103 while (iter.next()) { 1104 if (iter.type() == relocInfo::oop_type) { 1105 oop_Relocation* reloc = iter.oop_reloc(); 1106 if (initialize_immediates && reloc->oop_is_immediate()) { 1107 oop* dest = reloc->oop_addr(); 1108 initialize_immediate_oop(dest, (jobject) *dest); 1109 } 1110 // Refresh the oop-related bits of this instruction. 1111 reloc->fix_oop_relocation(); 1112 } else if (iter.type() == relocInfo::metadata_type) { 1113 metadata_Relocation* reloc = iter.metadata_reloc(); 1114 reloc->fix_metadata_relocation(); 1115 } 1116 } 1117 } 1118 1119 1120 void nmethod::verify_oop_relocations() { 1121 // Ensure sure that the code matches the current oop values 1122 RelocIterator iter(this, NULL, NULL); 1123 while (iter.next()) { 1124 if (iter.type() == relocInfo::oop_type) { 1125 oop_Relocation* reloc = iter.oop_reloc(); 1126 if (!reloc->oop_is_immediate()) { 1127 reloc->verify_oop_relocation(); 1128 } 1129 } 1130 } 1131 } 1132 1133 1134 ScopeDesc* nmethod::scope_desc_at(address pc) { 1135 PcDesc* pd = pc_desc_at(pc); 1136 guarantee(pd != NULL, "scope must be present"); 1137 return new ScopeDesc(this, pd->scope_decode_offset(), 1138 pd->obj_decode_offset(), pd->should_reexecute(), 1139 pd->return_oop()); 1140 } 1141 1142 1143 void nmethod::clear_inline_caches() { 1144 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1145 if (is_zombie()) { 1146 return; 1147 } 1148 1149 RelocIterator iter(this); 1150 while (iter.next()) { 1151 iter.reloc()->clear_inline_cache(); 1152 } 1153 } 1154 1155 // Clear ICStubs of all compiled ICs 1156 void nmethod::clear_ic_stubs() { 1157 assert_locked_or_safepoint(CompiledIC_lock); 1158 ResourceMark rm; 1159 RelocIterator iter(this); 1160 while(iter.next()) { 1161 if (iter.type() == relocInfo::virtual_call_type) { 1162 CompiledIC* ic = CompiledIC_at(&iter); 1163 ic->clear_ic_stub(); 1164 } 1165 } 1166 } 1167 1168 1169 void nmethod::cleanup_inline_caches() { 1170 assert_locked_or_safepoint(CompiledIC_lock); 1171 1172 // If the method is not entrant or zombie then a JMP is plastered over the 1173 // first few bytes. If an oop in the old code was there, that oop 1174 // should not get GC'd. Skip the first few bytes of oops on 1175 // not-entrant methods. 1176 address low_boundary = verified_entry_point(); 1177 if (!is_in_use()) { 1178 low_boundary += NativeJump::instruction_size; 1179 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1180 // This means that the low_boundary is going to be a little too high. 1181 // This shouldn't matter, since oops of non-entrant methods are never used. 1182 // In fact, why are we bothering to look at oops in a non-entrant method?? 1183 } 1184 1185 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1186 // zombie and unloaded nmethods. 1187 ResourceMark rm; 1188 RelocIterator iter(this, low_boundary); 1189 while(iter.next()) { 1190 switch(iter.type()) { 1191 case relocInfo::virtual_call_type: 1192 case relocInfo::opt_virtual_call_type: { 1193 CompiledIC *ic = CompiledIC_at(&iter); 1194 // Ok, to lookup references to zombies here 1195 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1196 if( cb != NULL && cb->is_nmethod() ) { 1197 nmethod* nm = (nmethod*)cb; 1198 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1199 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1200 } 1201 break; 1202 } 1203 case relocInfo::static_call_type: { 1204 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1205 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1206 if( cb != NULL && cb->is_nmethod() ) { 1207 nmethod* nm = (nmethod*)cb; 1208 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1209 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1210 } 1211 break; 1212 } 1213 } 1214 } 1215 } 1216 1217 void nmethod::verify_clean_inline_caches() { 1218 assert_locked_or_safepoint(CompiledIC_lock); 1219 1220 // If the method is not entrant or zombie then a JMP is plastered over the 1221 // first few bytes. If an oop in the old code was there, that oop 1222 // should not get GC'd. Skip the first few bytes of oops on 1223 // not-entrant methods. 1224 address low_boundary = verified_entry_point(); 1225 if (!is_in_use()) { 1226 low_boundary += NativeJump::instruction_size; 1227 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1228 // This means that the low_boundary is going to be a little too high. 1229 // This shouldn't matter, since oops of non-entrant methods are never used. 1230 // In fact, why are we bothering to look at oops in a non-entrant method?? 1231 } 1232 1233 ResourceMark rm; 1234 RelocIterator iter(this, low_boundary); 1235 while(iter.next()) { 1236 switch(iter.type()) { 1237 case relocInfo::virtual_call_type: 1238 case relocInfo::opt_virtual_call_type: { 1239 CompiledIC *ic = CompiledIC_at(&iter); 1240 // Ok, to lookup references to zombies here 1241 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1242 if( cb != NULL && cb->is_nmethod() ) { 1243 nmethod* nm = (nmethod*)cb; 1244 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1245 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1246 assert(ic->is_clean(), "IC should be clean"); 1247 } 1248 } 1249 break; 1250 } 1251 case relocInfo::static_call_type: { 1252 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1253 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1254 if( cb != NULL && cb->is_nmethod() ) { 1255 nmethod* nm = (nmethod*)cb; 1256 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1257 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1258 assert(csc->is_clean(), "IC should be clean"); 1259 } 1260 } 1261 break; 1262 } 1263 } 1264 } 1265 } 1266 1267 int nmethod::verify_icholder_relocations() { 1268 int count = 0; 1269 1270 RelocIterator iter(this); 1271 while(iter.next()) { 1272 if (iter.type() == relocInfo::virtual_call_type) { 1273 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1274 CompiledIC *ic = CompiledIC_at(&iter); 1275 if (TraceCompiledIC) { 1276 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1277 ic->print(); 1278 } 1279 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1280 count++; 1281 } 1282 } 1283 } 1284 1285 return count; 1286 } 1287 1288 // This is a private interface with the sweeper. 1289 void nmethod::mark_as_seen_on_stack() { 1290 assert(is_alive(), "Must be an alive method"); 1291 // Set the traversal mark to ensure that the sweeper does 2 1292 // cleaning passes before moving to zombie. 1293 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1294 } 1295 1296 // Tell if a non-entrant method can be converted to a zombie (i.e., 1297 // there are no activations on the stack, not in use by the VM, 1298 // and not in use by the ServiceThread) 1299 bool nmethod::can_convert_to_zombie() { 1300 assert(is_not_entrant(), "must be a non-entrant method"); 1301 1302 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1303 // count can be greater than the stack traversal count before it hits the 1304 // nmethod for the second time. 1305 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1306 !is_locked_by_vm(); 1307 } 1308 1309 void nmethod::inc_decompile_count() { 1310 if (!is_compiled_by_c2()) return; 1311 // Could be gated by ProfileTraps, but do not bother... 1312 Method* m = method(); 1313 if (m == NULL) return; 1314 MethodData* mdo = m->method_data(); 1315 if (mdo == NULL) return; 1316 // There is a benign race here. See comments in methodData.hpp. 1317 mdo->inc_decompile_count(); 1318 } 1319 1320 void nmethod::increase_unloading_clock() { 1321 _global_unloading_clock++; 1322 if (_global_unloading_clock == 0) { 1323 // _nmethods are allocated with _unloading_clock == 0, 1324 // so 0 is never used as a clock value. 1325 _global_unloading_clock = 1; 1326 } 1327 } 1328 1329 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1330 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1331 } 1332 1333 unsigned char nmethod::unloading_clock() { 1334 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1335 } 1336 1337 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1338 1339 post_compiled_method_unload(); 1340 1341 // Since this nmethod is being unloaded, make sure that dependencies 1342 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1343 // indicate that this work is being done during a GC. 1344 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1345 assert(is_alive != NULL, "Should be non-NULL"); 1346 // A non-NULL is_alive closure indicates that this is being called during GC. 1347 flush_dependencies(is_alive); 1348 1349 // Break cycle between nmethod & method 1350 if (TraceClassUnloading && WizardMode) { 1351 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1352 " unloadable], Method*(" INTPTR_FORMAT 1353 "), cause(" INTPTR_FORMAT ")", 1354 this, (address)_method, (address)cause); 1355 if (!Universe::heap()->is_gc_active()) 1356 cause->klass()->print(); 1357 } 1358 // Unlink the osr method, so we do not look this up again 1359 if (is_osr_method()) { 1360 invalidate_osr_method(); 1361 } 1362 // If _method is already NULL the Method* is about to be unloaded, 1363 // so we don't have to break the cycle. Note that it is possible to 1364 // have the Method* live here, in case we unload the nmethod because 1365 // it is pointing to some oop (other than the Method*) being unloaded. 1366 if (_method != NULL) { 1367 // OSR methods point to the Method*, but the Method* does not 1368 // point back! 1369 if (_method->code() == this) { 1370 _method->clear_code(); // Break a cycle 1371 } 1372 _method = NULL; // Clear the method of this dead nmethod 1373 } 1374 // Make the class unloaded - i.e., change state and notify sweeper 1375 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1376 if (is_in_use()) { 1377 // Transitioning directly from live to unloaded -- so 1378 // we need to force a cache clean-up; remember this 1379 // for later on. 1380 CodeCache::set_needs_cache_clean(true); 1381 } 1382 1383 // Unregister must be done before the state change 1384 Universe::heap()->unregister_nmethod(this); 1385 1386 _state = unloaded; 1387 1388 // Log the unloading. 1389 log_state_change(); 1390 1391 // The Method* is gone at this point 1392 assert(_method == NULL, "Tautology"); 1393 1394 set_osr_link(NULL); 1395 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1396 NMethodSweeper::report_state_change(this); 1397 } 1398 1399 void nmethod::invalidate_osr_method() { 1400 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1401 // Remove from list of active nmethods 1402 if (method() != NULL) 1403 method()->method_holder()->remove_osr_nmethod(this); 1404 // Set entry as invalid 1405 _entry_bci = InvalidOSREntryBci; 1406 } 1407 1408 void nmethod::log_state_change() const { 1409 if (LogCompilation) { 1410 if (xtty != NULL) { 1411 ttyLocker ttyl; // keep the following output all in one block 1412 if (_state == unloaded) { 1413 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1414 os::current_thread_id()); 1415 } else { 1416 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1417 os::current_thread_id(), 1418 (_state == zombie ? " zombie='1'" : "")); 1419 } 1420 log_identity(xtty); 1421 xtty->stamp(); 1422 xtty->end_elem(); 1423 } 1424 } 1425 if (PrintCompilation && _state != unloaded) { 1426 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1427 } 1428 } 1429 1430 /** 1431 * Common functionality for both make_not_entrant and make_zombie 1432 */ 1433 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1434 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1435 assert(!is_zombie(), "should not already be a zombie"); 1436 1437 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1438 nmethodLocker nml(this); 1439 methodHandle the_method(method()); 1440 No_Safepoint_Verifier nsv; 1441 1442 // during patching, depending on the nmethod state we must notify the GC that 1443 // code has been unloaded, unregistering it. We cannot do this right while 1444 // holding the Patching_lock because we need to use the CodeCache_lock. This 1445 // would be prone to deadlocks. 1446 // This flag is used to remember whether we need to later lock and unregister. 1447 bool nmethod_needs_unregister = false; 1448 1449 { 1450 // invalidate osr nmethod before acquiring the patching lock since 1451 // they both acquire leaf locks and we don't want a deadlock. 1452 // This logic is equivalent to the logic below for patching the 1453 // verified entry point of regular methods. 1454 if (is_osr_method()) { 1455 // this effectively makes the osr nmethod not entrant 1456 invalidate_osr_method(); 1457 } 1458 1459 // Enter critical section. Does not block for safepoint. 1460 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1461 1462 if (_state == state) { 1463 // another thread already performed this transition so nothing 1464 // to do, but return false to indicate this. 1465 return false; 1466 } 1467 1468 // The caller can be calling the method statically or through an inline 1469 // cache call. 1470 if (!is_osr_method() && !is_not_entrant()) { 1471 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1472 SharedRuntime::get_handle_wrong_method_stub()); 1473 } 1474 1475 if (is_in_use()) { 1476 // It's a true state change, so mark the method as decompiled. 1477 // Do it only for transition from alive. 1478 inc_decompile_count(); 1479 } 1480 1481 // If the state is becoming a zombie, signal to unregister the nmethod with 1482 // the heap. 1483 // This nmethod may have already been unloaded during a full GC. 1484 if ((state == zombie) && !is_unloaded()) { 1485 nmethod_needs_unregister = true; 1486 } 1487 1488 // Must happen before state change. Otherwise we have a race condition in 1489 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1490 // transition its state from 'not_entrant' to 'zombie' without having to wait 1491 // for stack scanning. 1492 if (state == not_entrant) { 1493 mark_as_seen_on_stack(); 1494 OrderAccess::storestore(); 1495 } 1496 1497 // Change state 1498 _state = state; 1499 1500 // Log the transition once 1501 log_state_change(); 1502 1503 // Remove nmethod from method. 1504 // We need to check if both the _code and _from_compiled_code_entry_point 1505 // refer to this nmethod because there is a race in setting these two fields 1506 // in Method* as seen in bugid 4947125. 1507 // If the vep() points to the zombie nmethod, the memory for the nmethod 1508 // could be flushed and the compiler and vtable stubs could still call 1509 // through it. 1510 if (method() != NULL && (method()->code() == this || 1511 method()->from_compiled_entry() == verified_entry_point())) { 1512 HandleMark hm; 1513 method()->clear_code(false /* already owns Patching_lock */); 1514 } 1515 } // leave critical region under Patching_lock 1516 1517 // When the nmethod becomes zombie it is no longer alive so the 1518 // dependencies must be flushed. nmethods in the not_entrant 1519 // state will be flushed later when the transition to zombie 1520 // happens or they get unloaded. 1521 if (state == zombie) { 1522 { 1523 // Flushing dependecies must be done before any possible 1524 // safepoint can sneak in, otherwise the oops used by the 1525 // dependency logic could have become stale. 1526 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1527 if (nmethod_needs_unregister) { 1528 Universe::heap()->unregister_nmethod(this); 1529 } 1530 flush_dependencies(NULL); 1531 } 1532 1533 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1534 // event and it hasn't already been reported for this nmethod then 1535 // report it now. The event may have been reported earilier if the GC 1536 // marked it for unloading). JvmtiDeferredEventQueue support means 1537 // we no longer go to a safepoint here. 1538 post_compiled_method_unload(); 1539 1540 #ifdef ASSERT 1541 // It's no longer safe to access the oops section since zombie 1542 // nmethods aren't scanned for GC. 1543 _oops_are_stale = true; 1544 #endif 1545 // the Method may be reclaimed by class unloading now that the 1546 // nmethod is in zombie state 1547 set_method(NULL); 1548 } else { 1549 assert(state == not_entrant, "other cases may need to be handled differently"); 1550 } 1551 1552 if (TraceCreateZombies) { 1553 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1554 } 1555 1556 NMethodSweeper::report_state_change(this); 1557 return true; 1558 } 1559 1560 void nmethod::flush() { 1561 // Note that there are no valid oops in the nmethod anymore. 1562 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1563 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1564 1565 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1566 assert_locked_or_safepoint(CodeCache_lock); 1567 1568 // completely deallocate this method 1569 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1570 if (PrintMethodFlushing) { 1571 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1572 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1573 } 1574 1575 // We need to deallocate any ExceptionCache data. 1576 // Note that we do not need to grab the nmethod lock for this, it 1577 // better be thread safe if we're disposing of it! 1578 ExceptionCache* ec = exception_cache(); 1579 set_exception_cache(NULL); 1580 while(ec != NULL) { 1581 ExceptionCache* next = ec->next(); 1582 delete ec; 1583 ec = next; 1584 } 1585 1586 if (on_scavenge_root_list()) { 1587 CodeCache::drop_scavenge_root_nmethod(this); 1588 } 1589 1590 #ifdef SHARK 1591 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1592 #endif // SHARK 1593 1594 ((CodeBlob*)(this))->flush(); 1595 1596 CodeCache::free(this); 1597 } 1598 1599 1600 // 1601 // Notify all classes this nmethod is dependent on that it is no 1602 // longer dependent. This should only be called in two situations. 1603 // First, when a nmethod transitions to a zombie all dependents need 1604 // to be clear. Since zombification happens at a safepoint there's no 1605 // synchronization issues. The second place is a little more tricky. 1606 // During phase 1 of mark sweep class unloading may happen and as a 1607 // result some nmethods may get unloaded. In this case the flushing 1608 // of dependencies must happen during phase 1 since after GC any 1609 // dependencies in the unloaded nmethod won't be updated, so 1610 // traversing the dependency information in unsafe. In that case this 1611 // function is called with a non-NULL argument and this function only 1612 // notifies instanceKlasses that are reachable 1613 1614 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1615 assert_locked_or_safepoint(CodeCache_lock); 1616 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1617 "is_alive is non-NULL if and only if we are called during GC"); 1618 if (!has_flushed_dependencies()) { 1619 set_has_flushed_dependencies(); 1620 for (Dependencies::DepStream deps(this); deps.next(); ) { 1621 Klass* klass = deps.context_type(); 1622 if (klass == NULL) continue; // ignore things like evol_method 1623 1624 // During GC the is_alive closure is non-NULL, and is used to 1625 // determine liveness of dependees that need to be updated. 1626 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1627 // The GC defers deletion of this entry, since there might be multiple threads 1628 // iterating over the _dependencies graph. Other call paths are single-threaded 1629 // and may delete it immediately. 1630 bool delete_immediately = is_alive == NULL; 1631 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1632 } 1633 } 1634 } 1635 } 1636 1637 1638 // If this oop is not live, the nmethod can be unloaded. 1639 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1640 assert(root != NULL, "just checking"); 1641 oop obj = *root; 1642 if (obj == NULL || is_alive->do_object_b(obj)) { 1643 return false; 1644 } 1645 1646 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1647 // simply because one of its constant oops has gone dead. 1648 // No actual classes need to be unloaded in order for this to occur. 1649 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1650 make_unloaded(is_alive, obj); 1651 return true; 1652 } 1653 1654 // ------------------------------------------------------------------ 1655 // post_compiled_method_load_event 1656 // new method for install_code() path 1657 // Transfer information from compilation to jvmti 1658 void nmethod::post_compiled_method_load_event() { 1659 1660 Method* moop = method(); 1661 #ifndef USDT2 1662 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1663 moop->klass_name()->bytes(), 1664 moop->klass_name()->utf8_length(), 1665 moop->name()->bytes(), 1666 moop->name()->utf8_length(), 1667 moop->signature()->bytes(), 1668 moop->signature()->utf8_length(), 1669 insts_begin(), insts_size()); 1670 #else /* USDT2 */ 1671 HOTSPOT_COMPILED_METHOD_LOAD( 1672 (char *) moop->klass_name()->bytes(), 1673 moop->klass_name()->utf8_length(), 1674 (char *) moop->name()->bytes(), 1675 moop->name()->utf8_length(), 1676 (char *) moop->signature()->bytes(), 1677 moop->signature()->utf8_length(), 1678 insts_begin(), insts_size()); 1679 #endif /* USDT2 */ 1680 1681 if (JvmtiExport::should_post_compiled_method_load() || 1682 JvmtiExport::should_post_compiled_method_unload()) { 1683 get_and_cache_jmethod_id(); 1684 } 1685 1686 if (JvmtiExport::should_post_compiled_method_load()) { 1687 // Let the Service thread (which is a real Java thread) post the event 1688 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1689 JvmtiDeferredEventQueue::enqueue( 1690 JvmtiDeferredEvent::compiled_method_load_event(this)); 1691 } 1692 } 1693 1694 jmethodID nmethod::get_and_cache_jmethod_id() { 1695 if (_jmethod_id == NULL) { 1696 // Cache the jmethod_id since it can no longer be looked up once the 1697 // method itself has been marked for unloading. 1698 _jmethod_id = method()->jmethod_id(); 1699 } 1700 return _jmethod_id; 1701 } 1702 1703 void nmethod::post_compiled_method_unload() { 1704 if (unload_reported()) { 1705 // During unloading we transition to unloaded and then to zombie 1706 // and the unloading is reported during the first transition. 1707 return; 1708 } 1709 1710 assert(_method != NULL && !is_unloaded(), "just checking"); 1711 DTRACE_METHOD_UNLOAD_PROBE(method()); 1712 1713 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1714 // post the event. Sometime later this nmethod will be made a zombie 1715 // by the sweeper but the Method* will not be valid at that point. 1716 // If the _jmethod_id is null then no load event was ever requested 1717 // so don't bother posting the unload. The main reason for this is 1718 // that the jmethodID is a weak reference to the Method* so if 1719 // it's being unloaded there's no way to look it up since the weak 1720 // ref will have been cleared. 1721 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1722 assert(!unload_reported(), "already unloaded"); 1723 JvmtiDeferredEvent event = 1724 JvmtiDeferredEvent::compiled_method_unload_event(this, 1725 _jmethod_id, insts_begin()); 1726 if (SafepointSynchronize::is_at_safepoint()) { 1727 // Don't want to take the queueing lock. Add it as pending and 1728 // it will get enqueued later. 1729 JvmtiDeferredEventQueue::add_pending_event(event); 1730 } else { 1731 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1732 JvmtiDeferredEventQueue::enqueue(event); 1733 } 1734 } 1735 1736 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1737 // any time. As the nmethod is being unloaded now we mark it has 1738 // having the unload event reported - this will ensure that we don't 1739 // attempt to report the event in the unlikely scenario where the 1740 // event is enabled at the time the nmethod is made a zombie. 1741 set_unload_reported(); 1742 } 1743 1744 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) { 1745 if (ic->is_icholder_call()) { 1746 // The only exception is compiledICHolder oops which may 1747 // yet be marked below. (We check this further below). 1748 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1749 1750 if (mark_on_stack) { 1751 Metadata::mark_on_stack(cichk_oop->holder_method()); 1752 Metadata::mark_on_stack(cichk_oop->holder_klass()); 1753 } 1754 1755 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1756 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1757 return; 1758 } 1759 } else { 1760 Metadata* ic_oop = ic->cached_metadata(); 1761 if (ic_oop != NULL) { 1762 if (mark_on_stack) { 1763 Metadata::mark_on_stack(ic_oop); 1764 } 1765 1766 if (ic_oop->is_klass()) { 1767 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1768 return; 1769 } 1770 } else if (ic_oop->is_method()) { 1771 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1772 return; 1773 } 1774 } else { 1775 ShouldNotReachHere(); 1776 } 1777 } 1778 } 1779 1780 ic->set_to_clean(); 1781 } 1782 1783 // This is called at the end of the strong tracing/marking phase of a 1784 // GC to unload an nmethod if it contains otherwise unreachable 1785 // oops. 1786 1787 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1788 // Make sure the oop's ready to receive visitors 1789 assert(!is_zombie() && !is_unloaded(), 1790 "should not call follow on zombie or unloaded nmethod"); 1791 1792 // If the method is not entrant then a JMP is plastered over the 1793 // first few bytes. If an oop in the old code was there, that oop 1794 // should not get GC'd. Skip the first few bytes of oops on 1795 // not-entrant methods. 1796 address low_boundary = verified_entry_point(); 1797 if (is_not_entrant()) { 1798 low_boundary += NativeJump::instruction_size; 1799 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1800 // (See comment above.) 1801 } 1802 1803 // The RedefineClasses() API can cause the class unloading invariant 1804 // to no longer be true. See jvmtiExport.hpp for details. 1805 // Also, leave a debugging breadcrumb in local flag. 1806 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1807 if (a_class_was_redefined) { 1808 // This set of the unloading_occurred flag is done before the 1809 // call to post_compiled_method_unload() so that the unloading 1810 // of this nmethod is reported. 1811 unloading_occurred = true; 1812 } 1813 1814 // Exception cache 1815 clean_exception_cache(is_alive); 1816 1817 // If class unloading occurred we first iterate over all inline caches and 1818 // clear ICs where the cached oop is referring to an unloaded klass or method. 1819 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1820 // iteration below. 1821 if (unloading_occurred) { 1822 RelocIterator iter(this, low_boundary); 1823 while(iter.next()) { 1824 if (iter.type() == relocInfo::virtual_call_type) { 1825 CompiledIC *ic = CompiledIC_at(&iter); 1826 clean_ic_if_metadata_is_dead(ic, is_alive, false); 1827 } 1828 } 1829 } 1830 1831 // Compiled code 1832 { 1833 RelocIterator iter(this, low_boundary); 1834 while (iter.next()) { 1835 if (iter.type() == relocInfo::oop_type) { 1836 oop_Relocation* r = iter.oop_reloc(); 1837 // In this loop, we must only traverse those oops directly embedded in 1838 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1839 assert(1 == (r->oop_is_immediate()) + 1840 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1841 "oop must be found in exactly one place"); 1842 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1843 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1844 return; 1845 } 1846 } 1847 } 1848 } 1849 } 1850 1851 1852 // Scopes 1853 for (oop* p = oops_begin(); p < oops_end(); p++) { 1854 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1855 if (can_unload(is_alive, p, unloading_occurred)) { 1856 return; 1857 } 1858 } 1859 1860 // Ensure that all metadata is still alive 1861 verify_metadata_loaders(low_boundary, is_alive); 1862 } 1863 1864 template <class CompiledICorStaticCall> 1865 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1866 // Ok, to lookup references to zombies here 1867 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1868 if (cb != NULL && cb->is_nmethod()) { 1869 nmethod* nm = (nmethod*)cb; 1870 1871 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1872 // The nmethod has not been processed yet. 1873 return true; 1874 } 1875 1876 // Clean inline caches pointing to both zombie and not_entrant methods 1877 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1878 ic->set_to_clean(); 1879 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1880 } 1881 } 1882 1883 return false; 1884 } 1885 1886 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1887 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1888 } 1889 1890 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1891 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1892 } 1893 1894 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1895 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1896 1897 oop_Relocation* r = iter_at_oop->oop_reloc(); 1898 // Traverse those oops directly embedded in the code. 1899 // Other oops (oop_index>0) are seen as part of scopes_oops. 1900 assert(1 == (r->oop_is_immediate()) + 1901 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1902 "oop must be found in exactly one place"); 1903 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1904 // Unload this nmethod if the oop is dead. 1905 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1906 return true;; 1907 } 1908 } 1909 1910 return false; 1911 } 1912 1913 void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) { 1914 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type"); 1915 1916 metadata_Relocation* r = iter_at_metadata->metadata_reloc(); 1917 // In this metadata, we must only follow those metadatas directly embedded in 1918 // the code. Other metadatas (oop_index>0) are seen as part of 1919 // the metadata section below. 1920 assert(1 == (r->metadata_is_immediate()) + 1921 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1922 "metadata must be found in exactly one place"); 1923 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1924 Metadata* md = r->metadata_value(); 1925 if (md != _method) Metadata::mark_on_stack(md); 1926 } 1927 } 1928 1929 void nmethod::mark_metadata_on_stack_non_relocs() { 1930 // Visit the metadata section 1931 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1932 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1933 Metadata* md = *p; 1934 Metadata::mark_on_stack(md); 1935 } 1936 1937 // Visit metadata not embedded in the other places. 1938 if (_method != NULL) Metadata::mark_on_stack(_method); 1939 } 1940 1941 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1942 ResourceMark rm; 1943 1944 // Make sure the oop's ready to receive visitors 1945 assert(!is_zombie() && !is_unloaded(), 1946 "should not call follow on zombie or unloaded nmethod"); 1947 1948 // If the method is not entrant then a JMP is plastered over the 1949 // first few bytes. If an oop in the old code was there, that oop 1950 // should not get GC'd. Skip the first few bytes of oops on 1951 // not-entrant methods. 1952 address low_boundary = verified_entry_point(); 1953 if (is_not_entrant()) { 1954 low_boundary += NativeJump::instruction_size; 1955 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1956 // (See comment above.) 1957 } 1958 1959 // The RedefineClasses() API can cause the class unloading invariant 1960 // to no longer be true. See jvmtiExport.hpp for details. 1961 // Also, leave a debugging breadcrumb in local flag. 1962 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1963 if (a_class_was_redefined) { 1964 // This set of the unloading_occurred flag is done before the 1965 // call to post_compiled_method_unload() so that the unloading 1966 // of this nmethod is reported. 1967 unloading_occurred = true; 1968 } 1969 1970 // When class redefinition is used all metadata in the CodeCache has to be recorded, 1971 // so that unused "previous versions" can be purged. Since walking the CodeCache can 1972 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code. 1973 bool mark_metadata_on_stack = a_class_was_redefined; 1974 1975 // Exception cache 1976 clean_exception_cache(is_alive); 1977 1978 bool is_unloaded = false; 1979 bool postponed = false; 1980 1981 RelocIterator iter(this, low_boundary); 1982 while(iter.next()) { 1983 1984 switch (iter.type()) { 1985 1986 case relocInfo::virtual_call_type: 1987 if (unloading_occurred) { 1988 // If class unloading occurred we first iterate over all inline caches and 1989 // clear ICs where the cached oop is referring to an unloaded klass or method. 1990 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack); 1991 } 1992 1993 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1994 break; 1995 1996 case relocInfo::opt_virtual_call_type: 1997 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1998 break; 1999 2000 case relocInfo::static_call_type: 2001 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2002 break; 2003 2004 case relocInfo::oop_type: 2005 if (!is_unloaded) { 2006 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 2007 } 2008 break; 2009 2010 case relocInfo::metadata_type: 2011 if (mark_metadata_on_stack) { 2012 mark_metadata_on_stack_at(&iter); 2013 } 2014 } 2015 } 2016 2017 if (mark_metadata_on_stack) { 2018 mark_metadata_on_stack_non_relocs(); 2019 } 2020 2021 if (is_unloaded) { 2022 return postponed; 2023 } 2024 2025 // Scopes 2026 for (oop* p = oops_begin(); p < oops_end(); p++) { 2027 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2028 if (can_unload(is_alive, p, unloading_occurred)) { 2029 is_unloaded = true; 2030 break; 2031 } 2032 } 2033 2034 if (is_unloaded) { 2035 return postponed; 2036 } 2037 2038 // Ensure that all metadata is still alive 2039 verify_metadata_loaders(low_boundary, is_alive); 2040 2041 return postponed; 2042 } 2043 2044 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2045 ResourceMark rm; 2046 2047 // Make sure the oop's ready to receive visitors 2048 assert(!is_zombie(), 2049 "should not call follow on zombie nmethod"); 2050 2051 // If the method is not entrant then a JMP is plastered over the 2052 // first few bytes. If an oop in the old code was there, that oop 2053 // should not get GC'd. Skip the first few bytes of oops on 2054 // not-entrant methods. 2055 address low_boundary = verified_entry_point(); 2056 if (is_not_entrant()) { 2057 low_boundary += NativeJump::instruction_size; 2058 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2059 // (See comment above.) 2060 } 2061 2062 RelocIterator iter(this, low_boundary); 2063 while(iter.next()) { 2064 2065 switch (iter.type()) { 2066 2067 case relocInfo::virtual_call_type: 2068 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2069 break; 2070 2071 case relocInfo::opt_virtual_call_type: 2072 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2073 break; 2074 2075 case relocInfo::static_call_type: 2076 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2077 break; 2078 } 2079 } 2080 } 2081 2082 #ifdef ASSERT 2083 2084 class CheckClass : AllStatic { 2085 static BoolObjectClosure* _is_alive; 2086 2087 // Check class_loader is alive for this bit of metadata. 2088 static void check_class(Metadata* md) { 2089 Klass* klass = NULL; 2090 if (md->is_klass()) { 2091 klass = ((Klass*)md); 2092 } else if (md->is_method()) { 2093 klass = ((Method*)md)->method_holder(); 2094 } else if (md->is_methodData()) { 2095 klass = ((MethodData*)md)->method()->method_holder(); 2096 } else { 2097 md->print(); 2098 ShouldNotReachHere(); 2099 } 2100 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2101 } 2102 public: 2103 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2104 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2105 _is_alive = is_alive; 2106 nm->metadata_do(check_class); 2107 } 2108 }; 2109 2110 // This is called during a safepoint so can use static data 2111 BoolObjectClosure* CheckClass::_is_alive = NULL; 2112 #endif // ASSERT 2113 2114 2115 // Processing of oop references should have been sufficient to keep 2116 // all strong references alive. Any weak references should have been 2117 // cleared as well. Visit all the metadata and ensure that it's 2118 // really alive. 2119 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2120 #ifdef ASSERT 2121 RelocIterator iter(this, low_boundary); 2122 while (iter.next()) { 2123 // static_stub_Relocations may have dangling references to 2124 // Method*s so trim them out here. Otherwise it looks like 2125 // compiled code is maintaining a link to dead metadata. 2126 address static_call_addr = NULL; 2127 if (iter.type() == relocInfo::opt_virtual_call_type) { 2128 CompiledIC* cic = CompiledIC_at(&iter); 2129 if (!cic->is_call_to_interpreted()) { 2130 static_call_addr = iter.addr(); 2131 } 2132 } else if (iter.type() == relocInfo::static_call_type) { 2133 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2134 if (!csc->is_call_to_interpreted()) { 2135 static_call_addr = iter.addr(); 2136 } 2137 } 2138 if (static_call_addr != NULL) { 2139 RelocIterator sciter(this, low_boundary); 2140 while (sciter.next()) { 2141 if (sciter.type() == relocInfo::static_stub_type && 2142 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2143 sciter.static_stub_reloc()->clear_inline_cache(); 2144 } 2145 } 2146 } 2147 } 2148 // Check that the metadata embedded in the nmethod is alive 2149 CheckClass::do_check_class(is_alive, this); 2150 #endif 2151 } 2152 2153 2154 // Iterate over metadata calling this function. Used by RedefineClasses 2155 void nmethod::metadata_do(void f(Metadata*)) { 2156 address low_boundary = verified_entry_point(); 2157 if (is_not_entrant()) { 2158 low_boundary += NativeJump::instruction_size; 2159 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2160 // (See comment above.) 2161 } 2162 { 2163 // Visit all immediate references that are embedded in the instruction stream. 2164 RelocIterator iter(this, low_boundary); 2165 while (iter.next()) { 2166 if (iter.type() == relocInfo::metadata_type ) { 2167 metadata_Relocation* r = iter.metadata_reloc(); 2168 // In this metadata, we must only follow those metadatas directly embedded in 2169 // the code. Other metadatas (oop_index>0) are seen as part of 2170 // the metadata section below. 2171 assert(1 == (r->metadata_is_immediate()) + 2172 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2173 "metadata must be found in exactly one place"); 2174 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2175 Metadata* md = r->metadata_value(); 2176 if (md != _method) f(md); 2177 } 2178 } else if (iter.type() == relocInfo::virtual_call_type) { 2179 // Check compiledIC holders associated with this nmethod 2180 CompiledIC *ic = CompiledIC_at(&iter); 2181 if (ic->is_icholder_call()) { 2182 CompiledICHolder* cichk = ic->cached_icholder(); 2183 f(cichk->holder_method()); 2184 f(cichk->holder_klass()); 2185 } else { 2186 Metadata* ic_oop = ic->cached_metadata(); 2187 if (ic_oop != NULL) { 2188 f(ic_oop); 2189 } 2190 } 2191 } 2192 } 2193 } 2194 2195 // Visit the metadata section 2196 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2197 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2198 Metadata* md = *p; 2199 f(md); 2200 } 2201 2202 // Visit metadata not embedded in the other places. 2203 if (_method != NULL) f(_method); 2204 } 2205 2206 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2207 // make sure the oops ready to receive visitors 2208 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2209 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2210 2211 // If the method is not entrant or zombie then a JMP is plastered over the 2212 // first few bytes. If an oop in the old code was there, that oop 2213 // should not get GC'd. Skip the first few bytes of oops on 2214 // not-entrant methods. 2215 address low_boundary = verified_entry_point(); 2216 if (is_not_entrant()) { 2217 low_boundary += NativeJump::instruction_size; 2218 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2219 // (See comment above.) 2220 } 2221 2222 RelocIterator iter(this, low_boundary); 2223 2224 while (iter.next()) { 2225 if (iter.type() == relocInfo::oop_type ) { 2226 oop_Relocation* r = iter.oop_reloc(); 2227 // In this loop, we must only follow those oops directly embedded in 2228 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2229 assert(1 == (r->oop_is_immediate()) + 2230 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2231 "oop must be found in exactly one place"); 2232 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2233 f->do_oop(r->oop_addr()); 2234 } 2235 } 2236 } 2237 2238 // Scopes 2239 // This includes oop constants not inlined in the code stream. 2240 for (oop* p = oops_begin(); p < oops_end(); p++) { 2241 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2242 f->do_oop(p); 2243 } 2244 } 2245 2246 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2247 2248 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2249 2250 // An nmethod is "marked" if its _mark_link is set non-null. 2251 // Even if it is the end of the linked list, it will have a non-null link value, 2252 // as long as it is on the list. 2253 // This code must be MP safe, because it is used from parallel GC passes. 2254 bool nmethod::test_set_oops_do_mark() { 2255 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2256 nmethod* observed_mark_link = _oops_do_mark_link; 2257 if (observed_mark_link == NULL) { 2258 // Claim this nmethod for this thread to mark. 2259 observed_mark_link = (nmethod*) 2260 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2261 if (observed_mark_link == NULL) { 2262 2263 // Atomically append this nmethod (now claimed) to the head of the list: 2264 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2265 for (;;) { 2266 nmethod* required_mark_nmethods = observed_mark_nmethods; 2267 _oops_do_mark_link = required_mark_nmethods; 2268 observed_mark_nmethods = (nmethod*) 2269 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2270 if (observed_mark_nmethods == required_mark_nmethods) 2271 break; 2272 } 2273 // Mark was clear when we first saw this guy. 2274 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2275 return false; 2276 } 2277 } 2278 // On fall through, another racing thread marked this nmethod before we did. 2279 return true; 2280 } 2281 2282 void nmethod::oops_do_marking_prologue() { 2283 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2284 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2285 // We use cmpxchg_ptr instead of regular assignment here because the user 2286 // may fork a bunch of threads, and we need them all to see the same state. 2287 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2288 guarantee(observed == NULL, "no races in this sequential code"); 2289 } 2290 2291 void nmethod::oops_do_marking_epilogue() { 2292 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2293 nmethod* cur = _oops_do_mark_nmethods; 2294 while (cur != NMETHOD_SENTINEL) { 2295 assert(cur != NULL, "not NULL-terminated"); 2296 nmethod* next = cur->_oops_do_mark_link; 2297 cur->_oops_do_mark_link = NULL; 2298 DEBUG_ONLY(cur->verify_oop_relocations()); 2299 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2300 cur = next; 2301 } 2302 void* required = _oops_do_mark_nmethods; 2303 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2304 guarantee(observed == required, "no races in this sequential code"); 2305 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2306 } 2307 2308 class DetectScavengeRoot: public OopClosure { 2309 bool _detected_scavenge_root; 2310 public: 2311 DetectScavengeRoot() : _detected_scavenge_root(false) 2312 { NOT_PRODUCT(_print_nm = NULL); } 2313 bool detected_scavenge_root() { return _detected_scavenge_root; } 2314 virtual void do_oop(oop* p) { 2315 if ((*p) != NULL && (*p)->is_scavengable()) { 2316 NOT_PRODUCT(maybe_print(p)); 2317 _detected_scavenge_root = true; 2318 } 2319 } 2320 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2321 2322 #ifndef PRODUCT 2323 nmethod* _print_nm; 2324 void maybe_print(oop* p) { 2325 if (_print_nm == NULL) return; 2326 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2327 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 2328 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2329 (void *)(*p), (intptr_t)p); 2330 (*p)->print(); 2331 } 2332 #endif //PRODUCT 2333 }; 2334 2335 bool nmethod::detect_scavenge_root_oops() { 2336 DetectScavengeRoot detect_scavenge_root; 2337 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2338 oops_do(&detect_scavenge_root); 2339 return detect_scavenge_root.detected_scavenge_root(); 2340 } 2341 2342 // Method that knows how to preserve outgoing arguments at call. This method must be 2343 // called with a frame corresponding to a Java invoke 2344 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2345 #ifndef SHARK 2346 if (!method()->is_native()) { 2347 SimpleScopeDesc ssd(this, fr.pc()); 2348 Bytecode_invoke call(ssd.method(), ssd.bci()); 2349 bool has_receiver = call.has_receiver(); 2350 bool has_appendix = call.has_appendix(); 2351 Symbol* signature = call.signature(); 2352 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2353 } 2354 #endif // !SHARK 2355 } 2356 2357 2358 oop nmethod::embeddedOop_at(u_char* p) { 2359 RelocIterator iter(this, p, p + 1); 2360 while (iter.next()) 2361 if (iter.type() == relocInfo::oop_type) { 2362 return iter.oop_reloc()->oop_value(); 2363 } 2364 return NULL; 2365 } 2366 2367 2368 inline bool includes(void* p, void* from, void* to) { 2369 return from <= p && p < to; 2370 } 2371 2372 2373 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2374 assert(count >= 2, "must be sentinel values, at least"); 2375 2376 #ifdef ASSERT 2377 // must be sorted and unique; we do a binary search in find_pc_desc() 2378 int prev_offset = pcs[0].pc_offset(); 2379 assert(prev_offset == PcDesc::lower_offset_limit, 2380 "must start with a sentinel"); 2381 for (int i = 1; i < count; i++) { 2382 int this_offset = pcs[i].pc_offset(); 2383 assert(this_offset > prev_offset, "offsets must be sorted"); 2384 prev_offset = this_offset; 2385 } 2386 assert(prev_offset == PcDesc::upper_offset_limit, 2387 "must end with a sentinel"); 2388 #endif //ASSERT 2389 2390 // Search for MethodHandle invokes and tag the nmethod. 2391 for (int i = 0; i < count; i++) { 2392 if (pcs[i].is_method_handle_invoke()) { 2393 set_has_method_handle_invokes(true); 2394 break; 2395 } 2396 } 2397 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2398 2399 int size = count * sizeof(PcDesc); 2400 assert(scopes_pcs_size() >= size, "oob"); 2401 memcpy(scopes_pcs_begin(), pcs, size); 2402 2403 // Adjust the final sentinel downward. 2404 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2405 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2406 last_pc->set_pc_offset(content_size() + 1); 2407 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2408 // Fill any rounding gaps with copies of the last record. 2409 last_pc[1] = last_pc[0]; 2410 } 2411 // The following assert could fail if sizeof(PcDesc) is not 2412 // an integral multiple of oopSize (the rounding term). 2413 // If it fails, change the logic to always allocate a multiple 2414 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2415 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2416 } 2417 2418 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2419 assert(scopes_data_size() >= size, "oob"); 2420 memcpy(scopes_data_begin(), buffer, size); 2421 } 2422 2423 2424 #ifdef ASSERT 2425 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2426 PcDesc* lower = nm->scopes_pcs_begin(); 2427 PcDesc* upper = nm->scopes_pcs_end(); 2428 lower += 1; // exclude initial sentinel 2429 PcDesc* res = NULL; 2430 for (PcDesc* p = lower; p < upper; p++) { 2431 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2432 if (match_desc(p, pc_offset, approximate)) { 2433 if (res == NULL) 2434 res = p; 2435 else 2436 res = (PcDesc*) badAddress; 2437 } 2438 } 2439 return res; 2440 } 2441 #endif 2442 2443 2444 // Finds a PcDesc with real-pc equal to "pc" 2445 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2446 address base_address = code_begin(); 2447 if ((pc < base_address) || 2448 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2449 return NULL; // PC is wildly out of range 2450 } 2451 int pc_offset = (int) (pc - base_address); 2452 2453 // Check the PcDesc cache if it contains the desired PcDesc 2454 // (This as an almost 100% hit rate.) 2455 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2456 if (res != NULL) { 2457 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2458 return res; 2459 } 2460 2461 // Fallback algorithm: quasi-linear search for the PcDesc 2462 // Find the last pc_offset less than the given offset. 2463 // The successor must be the required match, if there is a match at all. 2464 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2465 PcDesc* lower = scopes_pcs_begin(); 2466 PcDesc* upper = scopes_pcs_end(); 2467 upper -= 1; // exclude final sentinel 2468 if (lower >= upper) return NULL; // native method; no PcDescs at all 2469 2470 #define assert_LU_OK \ 2471 /* invariant on lower..upper during the following search: */ \ 2472 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2473 assert(upper->pc_offset() >= pc_offset, "sanity") 2474 assert_LU_OK; 2475 2476 // Use the last successful return as a split point. 2477 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2478 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2479 if (mid->pc_offset() < pc_offset) { 2480 lower = mid; 2481 } else { 2482 upper = mid; 2483 } 2484 2485 // Take giant steps at first (4096, then 256, then 16, then 1) 2486 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2487 const int RADIX = (1 << LOG2_RADIX); 2488 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2489 while ((mid = lower + step) < upper) { 2490 assert_LU_OK; 2491 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2492 if (mid->pc_offset() < pc_offset) { 2493 lower = mid; 2494 } else { 2495 upper = mid; 2496 break; 2497 } 2498 } 2499 assert_LU_OK; 2500 } 2501 2502 // Sneak up on the value with a linear search of length ~16. 2503 while (true) { 2504 assert_LU_OK; 2505 mid = lower + 1; 2506 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2507 if (mid->pc_offset() < pc_offset) { 2508 lower = mid; 2509 } else { 2510 upper = mid; 2511 break; 2512 } 2513 } 2514 #undef assert_LU_OK 2515 2516 if (match_desc(upper, pc_offset, approximate)) { 2517 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2518 _pc_desc_cache.add_pc_desc(upper); 2519 return upper; 2520 } else { 2521 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2522 return NULL; 2523 } 2524 } 2525 2526 2527 bool nmethod::check_all_dependencies() { 2528 bool found_check = false; 2529 // wholesale check of all dependencies 2530 for (Dependencies::DepStream deps(this); deps.next(); ) { 2531 if (deps.check_dependency() != NULL) { 2532 found_check = true; 2533 NOT_DEBUG(break); 2534 } 2535 } 2536 return found_check; // tell caller if we found anything 2537 } 2538 2539 bool nmethod::check_dependency_on(DepChange& changes) { 2540 // What has happened: 2541 // 1) a new class dependee has been added 2542 // 2) dependee and all its super classes have been marked 2543 bool found_check = false; // set true if we are upset 2544 for (Dependencies::DepStream deps(this); deps.next(); ) { 2545 // Evaluate only relevant dependencies. 2546 if (deps.spot_check_dependency_at(changes) != NULL) { 2547 found_check = true; 2548 NOT_DEBUG(break); 2549 } 2550 } 2551 return found_check; 2552 } 2553 2554 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2555 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2556 Array<Method*>* dependee_methods = dependee_ik->methods(); 2557 for (Dependencies::DepStream deps(this); deps.next(); ) { 2558 if (deps.type() == Dependencies::evol_method) { 2559 Method* method = deps.method_argument(0); 2560 for (int j = 0; j < dependee_methods->length(); j++) { 2561 if (dependee_methods->at(j) == method) { 2562 // RC_TRACE macro has an embedded ResourceMark 2563 RC_TRACE(0x01000000, 2564 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2565 _method->method_holder()->external_name(), 2566 _method->name()->as_C_string(), 2567 _method->signature()->as_C_string(), compile_id(), 2568 method->method_holder()->external_name(), 2569 method->name()->as_C_string(), 2570 method->signature()->as_C_string())); 2571 if (TraceDependencies || LogCompilation) 2572 deps.log_dependency(dependee); 2573 return true; 2574 } 2575 } 2576 } 2577 } 2578 return false; 2579 } 2580 2581 // Called from mark_for_deoptimization, when dependee is invalidated. 2582 bool nmethod::is_dependent_on_method(Method* dependee) { 2583 for (Dependencies::DepStream deps(this); deps.next(); ) { 2584 if (deps.type() != Dependencies::evol_method) 2585 continue; 2586 Method* method = deps.method_argument(0); 2587 if (method == dependee) return true; 2588 } 2589 return false; 2590 } 2591 2592 2593 bool nmethod::is_patchable_at(address instr_addr) { 2594 assert(insts_contains(instr_addr), "wrong nmethod used"); 2595 if (is_zombie()) { 2596 // a zombie may never be patched 2597 return false; 2598 } 2599 return true; 2600 } 2601 2602 2603 address nmethod::continuation_for_implicit_exception(address pc) { 2604 // Exception happened outside inline-cache check code => we are inside 2605 // an active nmethod => use cpc to determine a return address 2606 int exception_offset = pc - code_begin(); 2607 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2608 #ifdef ASSERT 2609 if (cont_offset == 0) { 2610 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2611 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2612 HandleMark hm(thread); 2613 ResourceMark rm(thread); 2614 CodeBlob* cb = CodeCache::find_blob(pc); 2615 assert(cb != NULL && cb == this, ""); 2616 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2617 print(); 2618 method()->print_codes(); 2619 print_code(); 2620 print_pcs(); 2621 } 2622 #endif 2623 if (cont_offset == 0) { 2624 // Let the normal error handling report the exception 2625 return NULL; 2626 } 2627 return code_begin() + cont_offset; 2628 } 2629 2630 2631 2632 void nmethod_init() { 2633 // make sure you didn't forget to adjust the filler fields 2634 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2635 } 2636 2637 2638 //------------------------------------------------------------------------------------------- 2639 2640 2641 // QQQ might we make this work from a frame?? 2642 nmethodLocker::nmethodLocker(address pc) { 2643 CodeBlob* cb = CodeCache::find_blob(pc); 2644 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2645 _nm = (nmethod*)cb; 2646 lock_nmethod(_nm); 2647 } 2648 2649 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2650 // should pass zombie_ok == true. 2651 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2652 if (nm == NULL) return; 2653 Atomic::inc(&nm->_lock_count); 2654 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2655 } 2656 2657 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2658 if (nm == NULL) return; 2659 Atomic::dec(&nm->_lock_count); 2660 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2661 } 2662 2663 2664 // ----------------------------------------------------------------------------- 2665 // nmethod::get_deopt_original_pc 2666 // 2667 // Return the original PC for the given PC if: 2668 // (a) the given PC belongs to a nmethod and 2669 // (b) it is a deopt PC 2670 address nmethod::get_deopt_original_pc(const frame* fr) { 2671 if (fr->cb() == NULL) return NULL; 2672 2673 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2674 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2675 return nm->get_original_pc(fr); 2676 2677 return NULL; 2678 } 2679 2680 2681 // ----------------------------------------------------------------------------- 2682 // MethodHandle 2683 2684 bool nmethod::is_method_handle_return(address return_pc) { 2685 if (!has_method_handle_invokes()) return false; 2686 PcDesc* pd = pc_desc_at(return_pc); 2687 if (pd == NULL) 2688 return false; 2689 return pd->is_method_handle_invoke(); 2690 } 2691 2692 2693 // ----------------------------------------------------------------------------- 2694 // Verification 2695 2696 class VerifyOopsClosure: public OopClosure { 2697 nmethod* _nm; 2698 bool _ok; 2699 public: 2700 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2701 bool ok() { return _ok; } 2702 virtual void do_oop(oop* p) { 2703 if ((*p) == NULL || (*p)->is_oop()) return; 2704 if (_ok) { 2705 _nm->print_nmethod(true); 2706 _ok = false; 2707 } 2708 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2709 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2710 } 2711 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2712 }; 2713 2714 void nmethod::verify() { 2715 2716 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2717 // seems odd. 2718 2719 if (is_zombie() || is_not_entrant() || is_unloaded()) 2720 return; 2721 2722 // Make sure all the entry points are correctly aligned for patching. 2723 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2724 2725 // assert(method()->is_oop(), "must be valid"); 2726 2727 ResourceMark rm; 2728 2729 if (!CodeCache::contains(this)) { 2730 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2731 } 2732 2733 if(is_native_method() ) 2734 return; 2735 2736 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2737 if (nm != this) { 2738 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2739 this)); 2740 } 2741 2742 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2743 if (! p->verify(this)) { 2744 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2745 } 2746 } 2747 2748 VerifyOopsClosure voc(this); 2749 oops_do(&voc); 2750 assert(voc.ok(), "embedded oops must be OK"); 2751 verify_scavenge_root_oops(); 2752 2753 verify_scopes(); 2754 } 2755 2756 2757 void nmethod::verify_interrupt_point(address call_site) { 2758 // Verify IC only when nmethod installation is finished. 2759 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2760 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2761 if (is_installed) { 2762 Thread *cur = Thread::current(); 2763 if (CompiledIC_lock->owner() == cur || 2764 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2765 SafepointSynchronize::is_at_safepoint())) { 2766 CompiledIC_at(this, call_site); 2767 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2768 } else { 2769 MutexLocker ml_verify (CompiledIC_lock); 2770 CompiledIC_at(this, call_site); 2771 } 2772 } 2773 2774 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2775 assert(pd != NULL, "PcDesc must exist"); 2776 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2777 pd->obj_decode_offset(), pd->should_reexecute(), 2778 pd->return_oop()); 2779 !sd->is_top(); sd = sd->sender()) { 2780 sd->verify(); 2781 } 2782 } 2783 2784 void nmethod::verify_scopes() { 2785 if( !method() ) return; // Runtime stubs have no scope 2786 if (method()->is_native()) return; // Ignore stub methods. 2787 // iterate through all interrupt point 2788 // and verify the debug information is valid. 2789 RelocIterator iter((nmethod*)this); 2790 while (iter.next()) { 2791 address stub = NULL; 2792 switch (iter.type()) { 2793 case relocInfo::virtual_call_type: 2794 verify_interrupt_point(iter.addr()); 2795 break; 2796 case relocInfo::opt_virtual_call_type: 2797 stub = iter.opt_virtual_call_reloc()->static_stub(); 2798 verify_interrupt_point(iter.addr()); 2799 break; 2800 case relocInfo::static_call_type: 2801 stub = iter.static_call_reloc()->static_stub(); 2802 //verify_interrupt_point(iter.addr()); 2803 break; 2804 case relocInfo::runtime_call_type: 2805 address destination = iter.reloc()->value(); 2806 // Right now there is no way to find out which entries support 2807 // an interrupt point. It would be nice if we had this 2808 // information in a table. 2809 break; 2810 } 2811 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2812 } 2813 } 2814 2815 2816 // ----------------------------------------------------------------------------- 2817 // Non-product code 2818 #ifndef PRODUCT 2819 2820 class DebugScavengeRoot: public OopClosure { 2821 nmethod* _nm; 2822 bool _ok; 2823 public: 2824 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2825 bool ok() { return _ok; } 2826 virtual void do_oop(oop* p) { 2827 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2828 if (_ok) { 2829 _nm->print_nmethod(true); 2830 _ok = false; 2831 } 2832 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2833 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2834 (*p)->print(); 2835 } 2836 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2837 }; 2838 2839 void nmethod::verify_scavenge_root_oops() { 2840 if (UseG1GC) { 2841 return; 2842 } 2843 2844 if (!on_scavenge_root_list()) { 2845 // Actually look inside, to verify the claim that it's clean. 2846 DebugScavengeRoot debug_scavenge_root(this); 2847 oops_do(&debug_scavenge_root); 2848 if (!debug_scavenge_root.ok()) 2849 fatal("found an unadvertised bad scavengable oop in the code cache"); 2850 } 2851 assert(scavenge_root_not_marked(), ""); 2852 } 2853 2854 #endif // PRODUCT 2855 2856 // Printing operations 2857 2858 void nmethod::print() const { 2859 ResourceMark rm; 2860 ttyLocker ttyl; // keep the following output all in one block 2861 2862 tty->print("Compiled method "); 2863 2864 if (is_compiled_by_c1()) { 2865 tty->print("(c1) "); 2866 } else if (is_compiled_by_c2()) { 2867 tty->print("(c2) "); 2868 } else if (is_compiled_by_shark()) { 2869 tty->print("(shark) "); 2870 } else { 2871 tty->print("(nm) "); 2872 } 2873 2874 print_on(tty, NULL); 2875 2876 if (WizardMode) { 2877 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2878 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2879 tty->print(" { "); 2880 if (is_in_use()) tty->print("in_use "); 2881 if (is_not_entrant()) tty->print("not_entrant "); 2882 if (is_zombie()) tty->print("zombie "); 2883 if (is_unloaded()) tty->print("unloaded "); 2884 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2885 tty->print_cr("}:"); 2886 } 2887 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2888 (address)this, 2889 (address)this + size(), 2890 size()); 2891 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2892 relocation_begin(), 2893 relocation_end(), 2894 relocation_size()); 2895 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2896 consts_begin(), 2897 consts_end(), 2898 consts_size()); 2899 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2900 insts_begin(), 2901 insts_end(), 2902 insts_size()); 2903 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2904 stub_begin(), 2905 stub_end(), 2906 stub_size()); 2907 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2908 oops_begin(), 2909 oops_end(), 2910 oops_size()); 2911 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2912 metadata_begin(), 2913 metadata_end(), 2914 metadata_size()); 2915 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2916 scopes_data_begin(), 2917 scopes_data_end(), 2918 scopes_data_size()); 2919 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2920 scopes_pcs_begin(), 2921 scopes_pcs_end(), 2922 scopes_pcs_size()); 2923 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2924 dependencies_begin(), 2925 dependencies_end(), 2926 dependencies_size()); 2927 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2928 handler_table_begin(), 2929 handler_table_end(), 2930 handler_table_size()); 2931 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2932 nul_chk_table_begin(), 2933 nul_chk_table_end(), 2934 nul_chk_table_size()); 2935 } 2936 2937 void nmethod::print_code() { 2938 HandleMark hm; 2939 ResourceMark m; 2940 Disassembler::decode(this); 2941 } 2942 2943 2944 #ifndef PRODUCT 2945 2946 void nmethod::print_scopes() { 2947 // Find the first pc desc for all scopes in the code and print it. 2948 ResourceMark rm; 2949 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2950 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2951 continue; 2952 2953 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2954 sd->print_on(tty, p); 2955 } 2956 } 2957 2958 void nmethod::print_dependencies() { 2959 ResourceMark rm; 2960 ttyLocker ttyl; // keep the following output all in one block 2961 tty->print_cr("Dependencies:"); 2962 for (Dependencies::DepStream deps(this); deps.next(); ) { 2963 deps.print_dependency(); 2964 Klass* ctxk = deps.context_type(); 2965 if (ctxk != NULL) { 2966 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2967 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2968 } 2969 } 2970 deps.log_dependency(); // put it into the xml log also 2971 } 2972 } 2973 2974 2975 void nmethod::print_relocations() { 2976 ResourceMark m; // in case methods get printed via the debugger 2977 tty->print_cr("relocations:"); 2978 RelocIterator iter(this); 2979 iter.print(); 2980 if (UseRelocIndex) { 2981 jint* index_end = (jint*)relocation_end() - 1; 2982 jint index_size = *index_end; 2983 jint* index_start = (jint*)( (address)index_end - index_size ); 2984 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2985 if (index_size > 0) { 2986 jint* ip; 2987 for (ip = index_start; ip+2 <= index_end; ip += 2) 2988 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2989 ip[0], 2990 ip[1], 2991 header_end()+ip[0], 2992 relocation_begin()-1+ip[1]); 2993 for (; ip < index_end; ip++) 2994 tty->print_cr(" (%d ?)", ip[0]); 2995 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2996 ip++; 2997 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2998 } 2999 } 3000 } 3001 3002 3003 void nmethod::print_pcs() { 3004 ResourceMark m; // in case methods get printed via debugger 3005 tty->print_cr("pc-bytecode offsets:"); 3006 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3007 p->print(this); 3008 } 3009 } 3010 3011 #endif // PRODUCT 3012 3013 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3014 RelocIterator iter(this, begin, end); 3015 bool have_one = false; 3016 while (iter.next()) { 3017 have_one = true; 3018 switch (iter.type()) { 3019 case relocInfo::none: return "no_reloc"; 3020 case relocInfo::oop_type: { 3021 stringStream st; 3022 oop_Relocation* r = iter.oop_reloc(); 3023 oop obj = r->oop_value(); 3024 st.print("oop("); 3025 if (obj == NULL) st.print("NULL"); 3026 else obj->print_value_on(&st); 3027 st.print(")"); 3028 return st.as_string(); 3029 } 3030 case relocInfo::metadata_type: { 3031 stringStream st; 3032 metadata_Relocation* r = iter.metadata_reloc(); 3033 Metadata* obj = r->metadata_value(); 3034 st.print("metadata("); 3035 if (obj == NULL) st.print("NULL"); 3036 else obj->print_value_on(&st); 3037 st.print(")"); 3038 return st.as_string(); 3039 } 3040 case relocInfo::virtual_call_type: return "virtual_call"; 3041 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 3042 case relocInfo::static_call_type: return "static_call"; 3043 case relocInfo::static_stub_type: return "static_stub"; 3044 case relocInfo::runtime_call_type: return "runtime_call"; 3045 case relocInfo::external_word_type: return "external_word"; 3046 case relocInfo::internal_word_type: return "internal_word"; 3047 case relocInfo::section_word_type: return "section_word"; 3048 case relocInfo::poll_type: return "poll"; 3049 case relocInfo::poll_return_type: return "poll_return"; 3050 case relocInfo::type_mask: return "type_bit_mask"; 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(), 3062 p->return_oop()); 3063 } 3064 return NULL; 3065 } 3066 3067 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3068 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3069 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3070 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3071 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3072 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3073 3074 if (has_method_handle_invokes()) 3075 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3076 3077 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3078 3079 if (block_begin == entry_point()) { 3080 methodHandle m = method(); 3081 if (m.not_null()) { 3082 stream->print(" # "); 3083 m->print_value_on(stream); 3084 stream->cr(); 3085 } 3086 if (m.not_null() && !is_osr_method()) { 3087 ResourceMark rm; 3088 int sizeargs = m->size_of_parameters(); 3089 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3090 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3091 { 3092 int sig_index = 0; 3093 if (!m->is_static()) 3094 sig_bt[sig_index++] = T_OBJECT; // 'this' 3095 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3096 BasicType t = ss.type(); 3097 sig_bt[sig_index++] = t; 3098 if (type2size[t] == 2) { 3099 sig_bt[sig_index++] = T_VOID; 3100 } else { 3101 assert(type2size[t] == 1, "size is 1 or 2"); 3102 } 3103 } 3104 assert(sig_index == sizeargs, ""); 3105 } 3106 const char* spname = "sp"; // make arch-specific? 3107 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3108 int stack_slot_offset = this->frame_size() * wordSize; 3109 int tab1 = 14, tab2 = 24; 3110 int sig_index = 0; 3111 int arg_index = (m->is_static() ? 0 : -1); 3112 bool did_old_sp = false; 3113 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3114 bool at_this = (arg_index == -1); 3115 bool at_old_sp = false; 3116 BasicType t = (at_this ? T_OBJECT : ss.type()); 3117 assert(t == sig_bt[sig_index], "sigs in sync"); 3118 if (at_this) 3119 stream->print(" # this: "); 3120 else 3121 stream->print(" # parm%d: ", arg_index); 3122 stream->move_to(tab1); 3123 VMReg fst = regs[sig_index].first(); 3124 VMReg snd = regs[sig_index].second(); 3125 if (fst->is_reg()) { 3126 stream->print("%s", fst->name()); 3127 if (snd->is_valid()) { 3128 stream->print(":%s", snd->name()); 3129 } 3130 } else if (fst->is_stack()) { 3131 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3132 if (offset == stack_slot_offset) at_old_sp = true; 3133 stream->print("[%s+0x%x]", spname, offset); 3134 } else { 3135 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3136 } 3137 stream->print(" "); 3138 stream->move_to(tab2); 3139 stream->print("= "); 3140 if (at_this) { 3141 m->method_holder()->print_value_on(stream); 3142 } else { 3143 bool did_name = false; 3144 if (!at_this && ss.is_object()) { 3145 Symbol* name = ss.as_symbol_or_null(); 3146 if (name != NULL) { 3147 name->print_value_on(stream); 3148 did_name = true; 3149 } 3150 } 3151 if (!did_name) 3152 stream->print("%s", type2name(t)); 3153 } 3154 if (at_old_sp) { 3155 stream->print(" (%s of caller)", spname); 3156 did_old_sp = true; 3157 } 3158 stream->cr(); 3159 sig_index += type2size[t]; 3160 arg_index += 1; 3161 if (!at_this) ss.next(); 3162 } 3163 if (!did_old_sp) { 3164 stream->print(" # "); 3165 stream->move_to(tab1); 3166 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3167 stream->print(" (%s of caller)", spname); 3168 stream->cr(); 3169 } 3170 } 3171 } 3172 } 3173 3174 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3175 // First, find an oopmap in (begin, end]. 3176 // We use the odd half-closed interval so that oop maps and scope descs 3177 // which are tied to the byte after a call are printed with the call itself. 3178 address base = code_begin(); 3179 OopMapSet* oms = oop_maps(); 3180 if (oms != NULL) { 3181 for (int i = 0, imax = oms->size(); i < imax; i++) { 3182 OopMap* om = oms->at(i); 3183 address pc = base + om->offset(); 3184 if (pc > begin) { 3185 if (pc <= end) { 3186 st->move_to(column); 3187 st->print("; "); 3188 om->print_on(st); 3189 } 3190 break; 3191 } 3192 } 3193 } 3194 3195 // Print any debug info present at this pc. 3196 ScopeDesc* sd = scope_desc_in(begin, end); 3197 if (sd != NULL) { 3198 st->move_to(column); 3199 if (sd->bci() == SynchronizationEntryBCI) { 3200 st->print(";*synchronization entry"); 3201 } else { 3202 if (sd->method() == NULL) { 3203 st->print("method is NULL"); 3204 } else if (sd->method()->is_native()) { 3205 st->print("method is native"); 3206 } else { 3207 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3208 st->print(";*%s", Bytecodes::name(bc)); 3209 switch (bc) { 3210 case Bytecodes::_invokevirtual: 3211 case Bytecodes::_invokespecial: 3212 case Bytecodes::_invokestatic: 3213 case Bytecodes::_invokeinterface: 3214 { 3215 Bytecode_invoke invoke(sd->method(), sd->bci()); 3216 st->print(" "); 3217 if (invoke.name() != NULL) 3218 invoke.name()->print_symbol_on(st); 3219 else 3220 st->print("<UNKNOWN>"); 3221 break; 3222 } 3223 case Bytecodes::_getfield: 3224 case Bytecodes::_putfield: 3225 case Bytecodes::_getstatic: 3226 case Bytecodes::_putstatic: 3227 { 3228 Bytecode_field field(sd->method(), sd->bci()); 3229 st->print(" "); 3230 if (field.name() != NULL) 3231 field.name()->print_symbol_on(st); 3232 else 3233 st->print("<UNKNOWN>"); 3234 } 3235 } 3236 } 3237 } 3238 3239 // Print all scopes 3240 for (;sd != NULL; sd = sd->sender()) { 3241 st->move_to(column); 3242 st->print("; -"); 3243 if (sd->method() == NULL) { 3244 st->print("method is NULL"); 3245 } else { 3246 sd->method()->print_short_name(st); 3247 } 3248 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3249 if (lineno != -1) { 3250 st->print("@%d (line %d)", sd->bci(), lineno); 3251 } else { 3252 st->print("@%d", sd->bci()); 3253 } 3254 st->cr(); 3255 } 3256 } 3257 3258 // Print relocation information 3259 const char* str = reloc_string_for(begin, end); 3260 if (str != NULL) { 3261 if (sd != NULL) st->cr(); 3262 st->move_to(column); 3263 st->print("; {%s}", str); 3264 } 3265 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3266 if (cont_offset != 0) { 3267 st->move_to(column); 3268 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3269 } 3270 3271 } 3272 3273 #ifndef PRODUCT 3274 3275 void nmethod::print_value_on(outputStream* st) const { 3276 st->print("nmethod"); 3277 print_on(st, NULL); 3278 } 3279 3280 void nmethod::print_calls(outputStream* st) { 3281 RelocIterator iter(this); 3282 while (iter.next()) { 3283 switch (iter.type()) { 3284 case relocInfo::virtual_call_type: 3285 case relocInfo::opt_virtual_call_type: { 3286 VerifyMutexLocker mc(CompiledIC_lock); 3287 CompiledIC_at(&iter)->print(); 3288 break; 3289 } 3290 case relocInfo::static_call_type: 3291 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3292 compiledStaticCall_at(iter.reloc())->print(); 3293 break; 3294 } 3295 } 3296 } 3297 3298 void nmethod::print_handler_table() { 3299 ExceptionHandlerTable(this).print(); 3300 } 3301 3302 void nmethod::print_nul_chk_table() { 3303 ImplicitExceptionTable(this).print(code_begin()); 3304 } 3305 3306 void nmethod::print_statistics() { 3307 ttyLocker ttyl; 3308 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3309 nmethod_stats.print_native_nmethod_stats(); 3310 nmethod_stats.print_nmethod_stats(); 3311 DebugInformationRecorder::print_statistics(); 3312 nmethod_stats.print_pc_stats(); 3313 Dependencies::print_statistics(); 3314 if (xtty != NULL) xtty->tail("statistics"); 3315 } 3316 3317 #endif // PRODUCT