1 /* 2 * Copyright (c) 1997, 2014, 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 for (int i=0; i<count(); i++) { 258 if (pc_at(i) == addr) { 259 return handler_at(i); 260 } 261 } 262 return NULL; 263 } 264 265 266 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 267 if (test_address(addr) == handler) return true; 268 if (count() < cache_size) { 269 set_pc_at(count(),addr); 270 set_handler_at(count(), handler); 271 increment_count(); 272 return true; 273 } 274 return false; 275 } 276 277 278 // private method for handling exception cache 279 // These methods are private, and used to manipulate the exception cache 280 // directly. 281 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 282 ExceptionCache* ec = exception_cache(); 283 while (ec != NULL) { 284 if (ec->match_exception_with_space(exception)) { 285 return ec; 286 } 287 ec = ec->next(); 288 } 289 return NULL; 290 } 291 292 293 //----------------------------------------------------------------------------- 294 295 296 // Helper used by both find_pc_desc methods. 297 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 298 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 299 if (!approximate) 300 return pc->pc_offset() == pc_offset; 301 else 302 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 303 } 304 305 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 306 if (initial_pc_desc == NULL) { 307 _pc_descs[0] = NULL; // native method; no PcDescs at all 308 return; 309 } 310 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 311 // reset the cache by filling it with benign (non-null) values 312 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 313 for (int i = 0; i < cache_size; i++) 314 _pc_descs[i] = initial_pc_desc; 315 } 316 317 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 318 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 319 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 320 321 // Note: one might think that caching the most recently 322 // read value separately would be a win, but one would be 323 // wrong. When many threads are updating it, the cache 324 // line it's in would bounce between caches, negating 325 // any benefit. 326 327 // In order to prevent race conditions do not load cache elements 328 // repeatedly, but use a local copy: 329 PcDesc* res; 330 331 // Step one: Check the most recently added value. 332 res = _pc_descs[0]; 333 if (res == NULL) return NULL; // native method; no PcDescs at all 334 if (match_desc(res, pc_offset, approximate)) { 335 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 336 return res; 337 } 338 339 // Step two: Check the rest of the LRU cache. 340 for (int i = 1; i < cache_size; ++i) { 341 res = _pc_descs[i]; 342 if (res->pc_offset() < 0) break; // optimization: skip empty cache 343 if (match_desc(res, pc_offset, approximate)) { 344 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 345 return res; 346 } 347 } 348 349 // Report failure. 350 return NULL; 351 } 352 353 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 354 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 355 // Update the LRU cache by shifting pc_desc forward. 356 for (int i = 0; i < cache_size; i++) { 357 PcDesc* next = _pc_descs[i]; 358 _pc_descs[i] = pc_desc; 359 pc_desc = next; 360 } 361 } 362 363 // adjust pcs_size so that it is a multiple of both oopSize and 364 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 365 // of oopSize, then 2*sizeof(PcDesc) is) 366 static int adjust_pcs_size(int pcs_size) { 367 int nsize = round_to(pcs_size, oopSize); 368 if ((nsize % sizeof(PcDesc)) != 0) { 369 nsize = pcs_size + sizeof(PcDesc); 370 } 371 assert((nsize % oopSize) == 0, "correct alignment"); 372 return nsize; 373 } 374 375 //----------------------------------------------------------------------------- 376 377 378 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 379 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 380 assert(new_entry != NULL,"Must be non null"); 381 assert(new_entry->next() == NULL, "Must be null"); 382 383 if (exception_cache() != NULL) { 384 new_entry->set_next(exception_cache()); 385 } 386 set_exception_cache(new_entry); 387 } 388 389 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 390 ExceptionCache* prev = NULL; 391 ExceptionCache* curr = exception_cache(); 392 393 while (curr != NULL) { 394 ExceptionCache* next = curr->next(); 395 396 Klass* ex_klass = curr->exception_type(); 397 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 398 if (prev == NULL) { 399 set_exception_cache(next); 400 } else { 401 prev->set_next(next); 402 } 403 delete curr; 404 // prev stays the same. 405 } else { 406 prev = curr; 407 } 408 409 curr = next; 410 } 411 } 412 413 // public method for accessing the exception cache 414 // These are the public access methods. 415 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 416 // We never grab a lock to read the exception cache, so we may 417 // have false negatives. This is okay, as it can only happen during 418 // the first few exception lookups for a given nmethod. 419 ExceptionCache* ec = exception_cache(); 420 while (ec != NULL) { 421 address ret_val; 422 if ((ret_val = ec->match(exception,pc)) != NULL) { 423 return ret_val; 424 } 425 ec = ec->next(); 426 } 427 return NULL; 428 } 429 430 431 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 432 // There are potential race conditions during exception cache updates, so we 433 // must own the ExceptionCache_lock before doing ANY modifications. Because 434 // we don't lock during reads, it is possible to have several threads attempt 435 // to update the cache with the same data. We need to check for already inserted 436 // copies of the current data before adding it. 437 438 MutexLocker ml(ExceptionCache_lock); 439 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 440 441 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 442 target_entry = new ExceptionCache(exception,pc,handler); 443 add_exception_cache_entry(target_entry); 444 } 445 } 446 447 448 //-------------end of code for ExceptionCache-------------- 449 450 451 int nmethod::total_size() const { 452 return 453 consts_size() + 454 insts_size() + 455 stub_size() + 456 scopes_data_size() + 457 scopes_pcs_size() + 458 handler_table_size() + 459 nul_chk_table_size(); 460 } 461 462 const char* nmethod::compile_kind() const { 463 if (is_osr_method()) return "osr"; 464 if (method() != NULL && is_native_method()) return "c2n"; 465 return NULL; 466 } 467 468 // Fill in default values for various flag fields 469 void nmethod::init_defaults() { 470 _state = in_use; 471 _unloading_clock = 0; 472 _marked_for_reclamation = 0; 473 _has_flushed_dependencies = 0; 474 _has_unsafe_access = 0; 475 _has_method_handle_invokes = 0; 476 _lazy_critical_native = 0; 477 _has_wide_vectors = 0; 478 _marked_for_deoptimization = 0; 479 _lock_count = 0; 480 _stack_traversal_mark = 0; 481 _unload_reported = false; // jvmti state 482 483 #ifdef ASSERT 484 _oops_are_stale = false; 485 #endif 486 487 _oops_do_mark_link = NULL; 488 _jmethod_id = NULL; 489 _osr_link = NULL; 490 if (UseG1GC) { 491 _unloading_next = NULL; 492 } else { 493 _scavenge_root_link = NULL; 494 } 495 _scavenge_root_state = 0; 496 _compiler = NULL; 497 #if INCLUDE_RTM_OPT 498 _rtm_state = NoRTM; 499 #endif 500 #ifdef HAVE_DTRACE_H 501 _trap_offset = 0; 502 #endif // def HAVE_DTRACE_H 503 } 504 505 nmethod* nmethod::new_native_nmethod(methodHandle method, 506 int compile_id, 507 CodeBuffer *code_buffer, 508 int vep_offset, 509 int frame_complete, 510 int frame_size, 511 ByteSize basic_lock_owner_sp_offset, 512 ByteSize basic_lock_sp_offset, 513 OopMapSet* oop_maps) { 514 code_buffer->finalize_oop_references(method); 515 // create nmethod 516 nmethod* nm = NULL; 517 { 518 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 519 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 520 CodeOffsets offsets; 521 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 522 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 523 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size, 524 compile_id, &offsets, 525 code_buffer, frame_size, 526 basic_lock_owner_sp_offset, 527 basic_lock_sp_offset, oop_maps); 528 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 529 if (PrintAssembly && nm != NULL) { 530 Disassembler::decode(nm); 531 } 532 } 533 // verify nmethod 534 debug_only(if (nm) nm->verify();) // might block 535 536 if (nm != NULL) { 537 nm->log_new_nmethod(); 538 } 539 540 return nm; 541 } 542 543 #ifdef HAVE_DTRACE_H 544 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 545 CodeBuffer *code_buffer, 546 int vep_offset, 547 int trap_offset, 548 int frame_complete, 549 int frame_size) { 550 code_buffer->finalize_oop_references(method); 551 // create nmethod 552 nmethod* nm = NULL; 553 { 554 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 555 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 556 CodeOffsets offsets; 557 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 558 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 559 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 560 561 nm = new (nmethod_size) nmethod(method(), nmethod_size, 562 &offsets, code_buffer, frame_size); 563 564 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 565 if (PrintAssembly && nm != NULL) { 566 Disassembler::decode(nm); 567 } 568 } 569 // verify nmethod 570 debug_only(if (nm) nm->verify();) // might block 571 572 if (nm != NULL) { 573 nm->log_new_nmethod(); 574 } 575 576 return nm; 577 } 578 579 #endif // def HAVE_DTRACE_H 580 581 nmethod* nmethod::new_nmethod(methodHandle method, 582 int compile_id, 583 int entry_bci, 584 CodeOffsets* offsets, 585 int orig_pc_offset, 586 DebugInformationRecorder* debug_info, 587 Dependencies* dependencies, 588 CodeBuffer* code_buffer, int frame_size, 589 OopMapSet* oop_maps, 590 ExceptionHandlerTable* handler_table, 591 ImplicitExceptionTable* nul_chk_table, 592 AbstractCompiler* compiler, 593 int comp_level 594 ) 595 { 596 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 597 code_buffer->finalize_oop_references(method); 598 // create nmethod 599 nmethod* nm = NULL; 600 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 601 int nmethod_size = 602 allocation_size(code_buffer, sizeof(nmethod)) 603 + adjust_pcs_size(debug_info->pcs_size()) 604 + round_to(dependencies->size_in_bytes() , oopSize) 605 + round_to(handler_table->size_in_bytes(), oopSize) 606 + round_to(nul_chk_table->size_in_bytes(), oopSize) 607 + round_to(debug_info->data_size() , oopSize); 608 609 nm = new (nmethod_size) 610 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 611 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 612 oop_maps, 613 handler_table, 614 nul_chk_table, 615 compiler, 616 comp_level); 617 618 if (nm != NULL) { 619 // To make dependency checking during class loading fast, record 620 // the nmethod dependencies in the classes it is dependent on. 621 // This allows the dependency checking code to simply walk the 622 // class hierarchy above the loaded class, checking only nmethods 623 // which are dependent on those classes. The slow way is to 624 // check every nmethod for dependencies which makes it linear in 625 // the number of methods compiled. For applications with a lot 626 // classes the slow way is too slow. 627 for (Dependencies::DepStream deps(nm); deps.next(); ) { 628 Klass* klass = deps.context_type(); 629 if (klass == NULL) { 630 continue; // ignore things like evol_method 631 } 632 633 // record this nmethod as dependent on this klass 634 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 635 } 636 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 637 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 638 Disassembler::decode(nm); 639 } 640 } 641 } 642 // Do verification and logging outside CodeCache_lock. 643 if (nm != NULL) { 644 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 645 DEBUG_ONLY(nm->verify();) 646 nm->log_new_nmethod(); 647 } 648 return nm; 649 } 650 651 652 // For native wrappers 653 nmethod::nmethod( 654 Method* method, 655 int nmethod_size, 656 int compile_id, 657 CodeOffsets* offsets, 658 CodeBuffer* code_buffer, 659 int frame_size, 660 ByteSize basic_lock_owner_sp_offset, 661 ByteSize basic_lock_sp_offset, 662 OopMapSet* oop_maps ) 663 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 664 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 665 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 666 _native_basic_lock_sp_offset(basic_lock_sp_offset) 667 { 668 { 669 debug_only(No_Safepoint_Verifier nsv;) 670 assert_locked_or_safepoint(CodeCache_lock); 671 672 init_defaults(); 673 _method = method; 674 _entry_bci = InvocationEntryBci; 675 // We have no exception handler or deopt handler make the 676 // values something that will never match a pc like the nmethod vtable entry 677 _exception_offset = 0; 678 _deoptimize_offset = 0; 679 _deoptimize_mh_offset = 0; 680 _orig_pc_offset = 0; 681 682 _consts_offset = data_offset(); 683 _stub_offset = data_offset(); 684 _oops_offset = data_offset(); 685 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 686 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 687 _scopes_pcs_offset = _scopes_data_offset; 688 _dependencies_offset = _scopes_pcs_offset; 689 _handler_table_offset = _dependencies_offset; 690 _nul_chk_table_offset = _handler_table_offset; 691 _nmethod_end_offset = _nul_chk_table_offset; 692 _compile_id = compile_id; 693 _comp_level = CompLevel_none; 694 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 695 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 696 _osr_entry_point = NULL; 697 _exception_cache = NULL; 698 _pc_desc_cache.reset_to(NULL); 699 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 700 701 code_buffer->copy_values_to(this); 702 if (ScavengeRootsInCode) { 703 if (detect_scavenge_root_oops()) { 704 CodeCache::add_scavenge_root_nmethod(this); 705 } 706 Universe::heap()->register_nmethod(this); 707 } 708 debug_only(verify_scavenge_root_oops()); 709 CodeCache::commit(this); 710 } 711 712 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 713 ttyLocker ttyl; // keep the following output all in one block 714 // This output goes directly to the tty, not the compiler log. 715 // To enable tools to match it up with the compilation activity, 716 // be sure to tag this tty output with the compile ID. 717 if (xtty != NULL) { 718 xtty->begin_head("print_native_nmethod"); 719 xtty->method(_method); 720 xtty->stamp(); 721 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 722 } 723 // print the header part first 724 print(); 725 // then print the requested information 726 if (PrintNativeNMethods) { 727 print_code(); 728 if (oop_maps != NULL) { 729 oop_maps->print(); 730 } 731 } 732 if (PrintRelocations) { 733 print_relocations(); 734 } 735 if (xtty != NULL) { 736 xtty->tail("print_native_nmethod"); 737 } 738 } 739 } 740 741 // For dtrace wrappers 742 #ifdef HAVE_DTRACE_H 743 nmethod::nmethod( 744 Method* method, 745 int nmethod_size, 746 CodeOffsets* offsets, 747 CodeBuffer* code_buffer, 748 int frame_size) 749 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 750 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 751 _native_receiver_sp_offset(in_ByteSize(-1)), 752 _native_basic_lock_sp_offset(in_ByteSize(-1)) 753 { 754 { 755 debug_only(No_Safepoint_Verifier nsv;) 756 assert_locked_or_safepoint(CodeCache_lock); 757 758 init_defaults(); 759 _method = method; 760 _entry_bci = InvocationEntryBci; 761 // We have no exception handler or deopt handler make the 762 // values something that will never match a pc like the nmethod vtable entry 763 _exception_offset = 0; 764 _deoptimize_offset = 0; 765 _deoptimize_mh_offset = 0; 766 _unwind_handler_offset = -1; 767 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 768 _orig_pc_offset = 0; 769 _consts_offset = data_offset(); 770 _stub_offset = data_offset(); 771 _oops_offset = data_offset(); 772 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 773 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 774 _scopes_pcs_offset = _scopes_data_offset; 775 _dependencies_offset = _scopes_pcs_offset; 776 _handler_table_offset = _dependencies_offset; 777 _nul_chk_table_offset = _handler_table_offset; 778 _nmethod_end_offset = _nul_chk_table_offset; 779 _compile_id = 0; // default 780 _comp_level = CompLevel_none; 781 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 782 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 783 _osr_entry_point = NULL; 784 _exception_cache = NULL; 785 _pc_desc_cache.reset_to(NULL); 786 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 787 788 code_buffer->copy_values_to(this); 789 if (ScavengeRootsInCode) { 790 if (detect_scavenge_root_oops()) { 791 CodeCache::add_scavenge_root_nmethod(this); 792 } 793 Universe::heap()->register_nmethod(this); 794 } 795 DEBUG_ONLY(verify_scavenge_root_oops();) 796 CodeCache::commit(this); 797 } 798 799 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 800 ttyLocker ttyl; // keep the following output all in one block 801 // This output goes directly to the tty, not the compiler log. 802 // To enable tools to match it up with the compilation activity, 803 // be sure to tag this tty output with the compile ID. 804 if (xtty != NULL) { 805 xtty->begin_head("print_dtrace_nmethod"); 806 xtty->method(_method); 807 xtty->stamp(); 808 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 809 } 810 // print the header part first 811 print(); 812 // then print the requested information 813 if (PrintNMethods) { 814 print_code(); 815 } 816 if (PrintRelocations) { 817 print_relocations(); 818 } 819 if (xtty != NULL) { 820 xtty->tail("print_dtrace_nmethod"); 821 } 822 } 823 } 824 #endif // def HAVE_DTRACE_H 825 826 void* nmethod::operator new(size_t size, int nmethod_size) throw() { 827 // Not critical, may return null if there is too little continuous memory 828 return CodeCache::allocate(nmethod_size); 829 } 830 831 nmethod::nmethod( 832 Method* method, 833 int nmethod_size, 834 int compile_id, 835 int entry_bci, 836 CodeOffsets* offsets, 837 int orig_pc_offset, 838 DebugInformationRecorder* debug_info, 839 Dependencies* dependencies, 840 CodeBuffer *code_buffer, 841 int frame_size, 842 OopMapSet* oop_maps, 843 ExceptionHandlerTable* handler_table, 844 ImplicitExceptionTable* nul_chk_table, 845 AbstractCompiler* compiler, 846 int comp_level 847 ) 848 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 849 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 850 _native_receiver_sp_offset(in_ByteSize(-1)), 851 _native_basic_lock_sp_offset(in_ByteSize(-1)) 852 { 853 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 854 { 855 debug_only(No_Safepoint_Verifier nsv;) 856 assert_locked_or_safepoint(CodeCache_lock); 857 858 init_defaults(); 859 _method = method; 860 _entry_bci = entry_bci; 861 _compile_id = compile_id; 862 _comp_level = comp_level; 863 _compiler = compiler; 864 _orig_pc_offset = orig_pc_offset; 865 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 866 867 // Section offsets 868 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 869 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 870 871 // Exception handler and deopt handler are in the stub section 872 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 873 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 874 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 875 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 876 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 877 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 878 } else { 879 _deoptimize_mh_offset = -1; 880 } 881 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 882 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 883 } else { 884 _unwind_handler_offset = -1; 885 } 886 887 _oops_offset = data_offset(); 888 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 889 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 890 891 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 892 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 893 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 894 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 895 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 896 897 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 898 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 899 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 900 _exception_cache = NULL; 901 _pc_desc_cache.reset_to(scopes_pcs_begin()); 902 903 // Copy contents of ScopeDescRecorder to nmethod 904 code_buffer->copy_values_to(this); 905 debug_info->copy_to(this); 906 dependencies->copy_to(this); 907 if (ScavengeRootsInCode) { 908 if (detect_scavenge_root_oops()) { 909 CodeCache::add_scavenge_root_nmethod(this); 910 } 911 Universe::heap()->register_nmethod(this); 912 } 913 debug_only(verify_scavenge_root_oops()); 914 915 CodeCache::commit(this); 916 917 // Copy contents of ExceptionHandlerTable to nmethod 918 handler_table->copy_to(this); 919 nul_chk_table->copy_to(this); 920 921 // we use the information of entry points to find out if a method is 922 // static or non static 923 assert(compiler->is_c2() || 924 _method->is_static() == (entry_point() == _verified_entry_point), 925 " entry points must be same for static methods and vice versa"); 926 } 927 928 bool printnmethods = PrintNMethods 929 || CompilerOracle::should_print(_method) 930 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 931 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 932 print_nmethod(printnmethods); 933 } 934 } 935 936 937 // Print a short set of xml attributes to identify this nmethod. The 938 // output should be embedded in some other element. 939 void nmethod::log_identity(xmlStream* log) const { 940 log->print(" compile_id='%d'", compile_id()); 941 const char* nm_kind = compile_kind(); 942 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 943 if (compiler() != NULL) { 944 log->print(" compiler='%s'", compiler()->name()); 945 } 946 if (TieredCompilation) { 947 log->print(" level='%d'", comp_level()); 948 } 949 } 950 951 952 #define LOG_OFFSET(log, name) \ 953 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 954 log->print(" " XSTR(name) "_offset='%d'" , \ 955 (intptr_t)name##_begin() - (intptr_t)this) 956 957 958 void nmethod::log_new_nmethod() const { 959 if (LogCompilation && xtty != NULL) { 960 ttyLocker ttyl; 961 HandleMark hm; 962 xtty->begin_elem("nmethod"); 963 log_identity(xtty); 964 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 965 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 966 967 LOG_OFFSET(xtty, relocation); 968 LOG_OFFSET(xtty, consts); 969 LOG_OFFSET(xtty, insts); 970 LOG_OFFSET(xtty, stub); 971 LOG_OFFSET(xtty, scopes_data); 972 LOG_OFFSET(xtty, scopes_pcs); 973 LOG_OFFSET(xtty, dependencies); 974 LOG_OFFSET(xtty, handler_table); 975 LOG_OFFSET(xtty, nul_chk_table); 976 LOG_OFFSET(xtty, oops); 977 978 xtty->method(method()); 979 xtty->stamp(); 980 xtty->end_elem(); 981 } 982 } 983 984 #undef LOG_OFFSET 985 986 987 // Print out more verbose output usually for a newly created nmethod. 988 void nmethod::print_on(outputStream* st, const char* msg) const { 989 if (st != NULL) { 990 ttyLocker ttyl; 991 if (WizardMode) { 992 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); 993 st->print_cr(" (" INTPTR_FORMAT ")", this); 994 } else { 995 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); 996 } 997 } 998 } 999 1000 1001 void nmethod::print_nmethod(bool printmethod) { 1002 ttyLocker ttyl; // keep the following output all in one block 1003 if (xtty != NULL) { 1004 xtty->begin_head("print_nmethod"); 1005 xtty->stamp(); 1006 xtty->end_head(); 1007 } 1008 // print the header part first 1009 print(); 1010 // then print the requested information 1011 if (printmethod) { 1012 print_code(); 1013 print_pcs(); 1014 if (oop_maps()) { 1015 oop_maps()->print(); 1016 } 1017 } 1018 if (PrintDebugInfo) { 1019 print_scopes(); 1020 } 1021 if (PrintRelocations) { 1022 print_relocations(); 1023 } 1024 if (PrintDependencies) { 1025 print_dependencies(); 1026 } 1027 if (PrintExceptionHandlers) { 1028 print_handler_table(); 1029 print_nul_chk_table(); 1030 } 1031 if (xtty != NULL) { 1032 xtty->tail("print_nmethod"); 1033 } 1034 } 1035 1036 1037 // Promote one word from an assembly-time handle to a live embedded oop. 1038 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1039 if (handle == NULL || 1040 // As a special case, IC oops are initialized to 1 or -1. 1041 handle == (jobject) Universe::non_oop_word()) { 1042 (*dest) = (oop) handle; 1043 } else { 1044 (*dest) = JNIHandles::resolve_non_null(handle); 1045 } 1046 } 1047 1048 1049 // Have to have the same name because it's called by a template 1050 void nmethod::copy_values(GrowableArray<jobject>* array) { 1051 int length = array->length(); 1052 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1053 oop* dest = oops_begin(); 1054 for (int index = 0 ; index < length; index++) { 1055 initialize_immediate_oop(&dest[index], array->at(index)); 1056 } 1057 1058 // Now we can fix up all the oops in the code. We need to do this 1059 // in the code because the assembler uses jobjects as placeholders. 1060 // The code and relocations have already been initialized by the 1061 // CodeBlob constructor, so it is valid even at this early point to 1062 // iterate over relocations and patch the code. 1063 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1064 } 1065 1066 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1067 int length = array->length(); 1068 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1069 Metadata** dest = metadata_begin(); 1070 for (int index = 0 ; index < length; index++) { 1071 dest[index] = array->at(index); 1072 } 1073 } 1074 1075 bool nmethod::is_at_poll_return(address pc) { 1076 RelocIterator iter(this, pc, pc+1); 1077 while (iter.next()) { 1078 if (iter.type() == relocInfo::poll_return_type) 1079 return true; 1080 } 1081 return false; 1082 } 1083 1084 1085 bool nmethod::is_at_poll_or_poll_return(address pc) { 1086 RelocIterator iter(this, pc, pc+1); 1087 while (iter.next()) { 1088 relocInfo::relocType t = iter.type(); 1089 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1090 return true; 1091 } 1092 return false; 1093 } 1094 1095 1096 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1097 // re-patch all oop-bearing instructions, just in case some oops moved 1098 RelocIterator iter(this, begin, end); 1099 while (iter.next()) { 1100 if (iter.type() == relocInfo::oop_type) { 1101 oop_Relocation* reloc = iter.oop_reloc(); 1102 if (initialize_immediates && reloc->oop_is_immediate()) { 1103 oop* dest = reloc->oop_addr(); 1104 initialize_immediate_oop(dest, (jobject) *dest); 1105 } 1106 // Refresh the oop-related bits of this instruction. 1107 reloc->fix_oop_relocation(); 1108 } else if (iter.type() == relocInfo::metadata_type) { 1109 metadata_Relocation* reloc = iter.metadata_reloc(); 1110 reloc->fix_metadata_relocation(); 1111 } 1112 } 1113 } 1114 1115 1116 void nmethod::verify_oop_relocations() { 1117 // Ensure sure that the code matches the current oop values 1118 RelocIterator iter(this, NULL, NULL); 1119 while (iter.next()) { 1120 if (iter.type() == relocInfo::oop_type) { 1121 oop_Relocation* reloc = iter.oop_reloc(); 1122 if (!reloc->oop_is_immediate()) { 1123 reloc->verify_oop_relocation(); 1124 } 1125 } 1126 } 1127 } 1128 1129 1130 ScopeDesc* nmethod::scope_desc_at(address pc) { 1131 PcDesc* pd = pc_desc_at(pc); 1132 guarantee(pd != NULL, "scope must be present"); 1133 return new ScopeDesc(this, pd->scope_decode_offset(), 1134 pd->obj_decode_offset(), pd->should_reexecute(), 1135 pd->return_oop()); 1136 } 1137 1138 1139 void nmethod::clear_inline_caches() { 1140 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1141 if (is_zombie()) { 1142 return; 1143 } 1144 1145 RelocIterator iter(this); 1146 while (iter.next()) { 1147 iter.reloc()->clear_inline_cache(); 1148 } 1149 } 1150 1151 // Clear ICStubs of all compiled ICs 1152 void nmethod::clear_ic_stubs() { 1153 assert_locked_or_safepoint(CompiledIC_lock); 1154 RelocIterator iter(this); 1155 while(iter.next()) { 1156 if (iter.type() == relocInfo::virtual_call_type) { 1157 CompiledIC* ic = CompiledIC_at(&iter); 1158 ic->clear_ic_stub(); 1159 } 1160 } 1161 } 1162 1163 1164 void nmethod::cleanup_inline_caches() { 1165 assert_locked_or_safepoint(CompiledIC_lock); 1166 1167 // If the method is not entrant or zombie then a JMP is plastered over the 1168 // first few bytes. If an oop in the old code was there, that oop 1169 // should not get GC'd. Skip the first few bytes of oops on 1170 // not-entrant methods. 1171 address low_boundary = verified_entry_point(); 1172 if (!is_in_use()) { 1173 low_boundary += NativeJump::instruction_size; 1174 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1175 // This means that the low_boundary is going to be a little too high. 1176 // This shouldn't matter, since oops of non-entrant methods are never used. 1177 // In fact, why are we bothering to look at oops in a non-entrant method?? 1178 } 1179 1180 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1181 // zombie and unloaded nmethods. 1182 ResourceMark rm; 1183 RelocIterator iter(this, low_boundary); 1184 while(iter.next()) { 1185 switch(iter.type()) { 1186 case relocInfo::virtual_call_type: 1187 case relocInfo::opt_virtual_call_type: { 1188 CompiledIC *ic = CompiledIC_at(&iter); 1189 // Ok, to lookup references to zombies here 1190 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1191 if( cb != NULL && cb->is_nmethod() ) { 1192 nmethod* nm = (nmethod*)cb; 1193 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1194 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1195 } 1196 break; 1197 } 1198 case relocInfo::static_call_type: { 1199 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1200 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1201 if( cb != NULL && cb->is_nmethod() ) { 1202 nmethod* nm = (nmethod*)cb; 1203 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1204 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1205 } 1206 break; 1207 } 1208 } 1209 } 1210 } 1211 1212 void nmethod::verify_clean_inline_caches() { 1213 assert_locked_or_safepoint(CompiledIC_lock); 1214 1215 // If the method is not entrant or zombie then a JMP is plastered over the 1216 // first few bytes. If an oop in the old code was there, that oop 1217 // should not get GC'd. Skip the first few bytes of oops on 1218 // not-entrant methods. 1219 address low_boundary = verified_entry_point(); 1220 if (!is_in_use()) { 1221 low_boundary += NativeJump::instruction_size; 1222 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1223 // This means that the low_boundary is going to be a little too high. 1224 // This shouldn't matter, since oops of non-entrant methods are never used. 1225 // In fact, why are we bothering to look at oops in a non-entrant method?? 1226 } 1227 1228 ResourceMark rm; 1229 RelocIterator iter(this, low_boundary); 1230 while(iter.next()) { 1231 switch(iter.type()) { 1232 case relocInfo::virtual_call_type: 1233 case relocInfo::opt_virtual_call_type: { 1234 CompiledIC *ic = CompiledIC_at(&iter); 1235 // Ok, to lookup references to zombies here 1236 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1237 if( cb != NULL && cb->is_nmethod() ) { 1238 nmethod* nm = (nmethod*)cb; 1239 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1240 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1241 assert(ic->is_clean(), "IC should be clean"); 1242 } 1243 } 1244 break; 1245 } 1246 case relocInfo::static_call_type: { 1247 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1248 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1249 if( cb != NULL && cb->is_nmethod() ) { 1250 nmethod* nm = (nmethod*)cb; 1251 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1252 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1253 assert(csc->is_clean(), "IC should be clean"); 1254 } 1255 } 1256 break; 1257 } 1258 } 1259 } 1260 } 1261 1262 int nmethod::verify_icholder_relocations() { 1263 int count = 0; 1264 1265 RelocIterator iter(this); 1266 while(iter.next()) { 1267 if (iter.type() == relocInfo::virtual_call_type) { 1268 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1269 CompiledIC *ic = CompiledIC_at(&iter); 1270 if (TraceCompiledIC) { 1271 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1272 ic->print(); 1273 } 1274 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1275 count++; 1276 } 1277 } 1278 } 1279 1280 return count; 1281 } 1282 1283 // This is a private interface with the sweeper. 1284 void nmethod::mark_as_seen_on_stack() { 1285 assert(is_alive(), "Must be an alive method"); 1286 // Set the traversal mark to ensure that the sweeper does 2 1287 // cleaning passes before moving to zombie. 1288 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1289 } 1290 1291 // Tell if a non-entrant method can be converted to a zombie (i.e., 1292 // there are no activations on the stack, not in use by the VM, 1293 // and not in use by the ServiceThread) 1294 bool nmethod::can_convert_to_zombie() { 1295 assert(is_not_entrant(), "must be a non-entrant method"); 1296 1297 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1298 // count can be greater than the stack traversal count before it hits the 1299 // nmethod for the second time. 1300 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1301 !is_locked_by_vm(); 1302 } 1303 1304 void nmethod::inc_decompile_count() { 1305 if (!is_compiled_by_c2()) return; 1306 // Could be gated by ProfileTraps, but do not bother... 1307 Method* m = method(); 1308 if (m == NULL) return; 1309 MethodData* mdo = m->method_data(); 1310 if (mdo == NULL) return; 1311 // There is a benign race here. See comments in methodData.hpp. 1312 mdo->inc_decompile_count(); 1313 } 1314 1315 void nmethod::increase_unloading_clock() { 1316 _global_unloading_clock++; 1317 if (_global_unloading_clock == 0) { 1318 // _nmethods are allocated with _unloading_clock == 0, 1319 // so 0 is never used as a clock value. 1320 _global_unloading_clock = 1; 1321 } 1322 } 1323 1324 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1325 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1326 } 1327 1328 unsigned char nmethod::unloading_clock() { 1329 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1330 } 1331 1332 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1333 1334 post_compiled_method_unload(); 1335 1336 // Since this nmethod is being unloaded, make sure that dependencies 1337 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1338 // indicate that this work is being done during a GC. 1339 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1340 assert(is_alive != NULL, "Should be non-NULL"); 1341 // A non-NULL is_alive closure indicates that this is being called during GC. 1342 flush_dependencies(is_alive); 1343 1344 // Break cycle between nmethod & method 1345 if (TraceClassUnloading && WizardMode) { 1346 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1347 " unloadable], Method*(" INTPTR_FORMAT 1348 "), cause(" INTPTR_FORMAT ")", 1349 this, (address)_method, (address)cause); 1350 if (!Universe::heap()->is_gc_active()) 1351 cause->klass()->print(); 1352 } 1353 // Unlink the osr method, so we do not look this up again 1354 if (is_osr_method()) { 1355 invalidate_osr_method(); 1356 } 1357 // If _method is already NULL the Method* is about to be unloaded, 1358 // so we don't have to break the cycle. Note that it is possible to 1359 // have the Method* live here, in case we unload the nmethod because 1360 // it is pointing to some oop (other than the Method*) being unloaded. 1361 if (_method != NULL) { 1362 // OSR methods point to the Method*, but the Method* does not 1363 // point back! 1364 if (_method->code() == this) { 1365 _method->clear_code(); // Break a cycle 1366 } 1367 _method = NULL; // Clear the method of this dead nmethod 1368 } 1369 // Make the class unloaded - i.e., change state and notify sweeper 1370 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1371 if (is_in_use()) { 1372 // Transitioning directly from live to unloaded -- so 1373 // we need to force a cache clean-up; remember this 1374 // for later on. 1375 CodeCache::set_needs_cache_clean(true); 1376 } 1377 1378 // Unregister must be done before the state change 1379 Universe::heap()->unregister_nmethod(this); 1380 1381 _state = unloaded; 1382 1383 // Log the unloading. 1384 log_state_change(); 1385 1386 // The Method* is gone at this point 1387 assert(_method == NULL, "Tautology"); 1388 1389 set_osr_link(NULL); 1390 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1391 NMethodSweeper::report_state_change(this); 1392 } 1393 1394 void nmethod::invalidate_osr_method() { 1395 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1396 // Remove from list of active nmethods 1397 if (method() != NULL) 1398 method()->method_holder()->remove_osr_nmethod(this); 1399 // Set entry as invalid 1400 _entry_bci = InvalidOSREntryBci; 1401 } 1402 1403 void nmethod::log_state_change() const { 1404 if (LogCompilation) { 1405 if (xtty != NULL) { 1406 ttyLocker ttyl; // keep the following output all in one block 1407 if (_state == unloaded) { 1408 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1409 os::current_thread_id()); 1410 } else { 1411 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1412 os::current_thread_id(), 1413 (_state == zombie ? " zombie='1'" : "")); 1414 } 1415 log_identity(xtty); 1416 xtty->stamp(); 1417 xtty->end_elem(); 1418 } 1419 } 1420 if (PrintCompilation && _state != unloaded) { 1421 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1422 } 1423 } 1424 1425 /** 1426 * Common functionality for both make_not_entrant and make_zombie 1427 */ 1428 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1429 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1430 assert(!is_zombie(), "should not already be a zombie"); 1431 1432 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1433 nmethodLocker nml(this); 1434 methodHandle the_method(method()); 1435 No_Safepoint_Verifier nsv; 1436 1437 // during patching, depending on the nmethod state we must notify the GC that 1438 // code has been unloaded, unregistering it. We cannot do this right while 1439 // holding the Patching_lock because we need to use the CodeCache_lock. This 1440 // would be prone to deadlocks. 1441 // This flag is used to remember whether we need to later lock and unregister. 1442 bool nmethod_needs_unregister = false; 1443 1444 { 1445 // invalidate osr nmethod before acquiring the patching lock since 1446 // they both acquire leaf locks and we don't want a deadlock. 1447 // This logic is equivalent to the logic below for patching the 1448 // verified entry point of regular methods. 1449 if (is_osr_method()) { 1450 // this effectively makes the osr nmethod not entrant 1451 invalidate_osr_method(); 1452 } 1453 1454 // Enter critical section. Does not block for safepoint. 1455 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1456 1457 if (_state == state) { 1458 // another thread already performed this transition so nothing 1459 // to do, but return false to indicate this. 1460 return false; 1461 } 1462 1463 // The caller can be calling the method statically or through an inline 1464 // cache call. 1465 if (!is_osr_method() && !is_not_entrant()) { 1466 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1467 SharedRuntime::get_handle_wrong_method_stub()); 1468 } 1469 1470 if (is_in_use()) { 1471 // It's a true state change, so mark the method as decompiled. 1472 // Do it only for transition from alive. 1473 inc_decompile_count(); 1474 } 1475 1476 // If the state is becoming a zombie, signal to unregister the nmethod with 1477 // the heap. 1478 // This nmethod may have already been unloaded during a full GC. 1479 if ((state == zombie) && !is_unloaded()) { 1480 nmethod_needs_unregister = true; 1481 } 1482 1483 // Must happen before state change. Otherwise we have a race condition in 1484 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1485 // transition its state from 'not_entrant' to 'zombie' without having to wait 1486 // for stack scanning. 1487 if (state == not_entrant) { 1488 mark_as_seen_on_stack(); 1489 OrderAccess::storestore(); 1490 } 1491 1492 // Change state 1493 _state = state; 1494 1495 // Log the transition once 1496 log_state_change(); 1497 1498 // Remove nmethod from method. 1499 // We need to check if both the _code and _from_compiled_code_entry_point 1500 // refer to this nmethod because there is a race in setting these two fields 1501 // in Method* as seen in bugid 4947125. 1502 // If the vep() points to the zombie nmethod, the memory for the nmethod 1503 // could be flushed and the compiler and vtable stubs could still call 1504 // through it. 1505 if (method() != NULL && (method()->code() == this || 1506 method()->from_compiled_entry() == verified_entry_point())) { 1507 HandleMark hm; 1508 method()->clear_code(); 1509 } 1510 } // leave critical region under Patching_lock 1511 1512 // When the nmethod becomes zombie it is no longer alive so the 1513 // dependencies must be flushed. nmethods in the not_entrant 1514 // state will be flushed later when the transition to zombie 1515 // happens or they get unloaded. 1516 if (state == zombie) { 1517 { 1518 // Flushing dependecies must be done before any possible 1519 // safepoint can sneak in, otherwise the oops used by the 1520 // dependency logic could have become stale. 1521 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1522 if (nmethod_needs_unregister) { 1523 Universe::heap()->unregister_nmethod(this); 1524 } 1525 flush_dependencies(NULL); 1526 } 1527 1528 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1529 // event and it hasn't already been reported for this nmethod then 1530 // report it now. The event may have been reported earilier if the GC 1531 // marked it for unloading). JvmtiDeferredEventQueue support means 1532 // we no longer go to a safepoint here. 1533 post_compiled_method_unload(); 1534 1535 #ifdef ASSERT 1536 // It's no longer safe to access the oops section since zombie 1537 // nmethods aren't scanned for GC. 1538 _oops_are_stale = true; 1539 #endif 1540 // the Method may be reclaimed by class unloading now that the 1541 // nmethod is in zombie state 1542 set_method(NULL); 1543 } else { 1544 assert(state == not_entrant, "other cases may need to be handled differently"); 1545 } 1546 1547 if (TraceCreateZombies) { 1548 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1549 } 1550 1551 NMethodSweeper::report_state_change(this); 1552 return true; 1553 } 1554 1555 void nmethod::flush() { 1556 // Note that there are no valid oops in the nmethod anymore. 1557 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1558 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1559 1560 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1561 assert_locked_or_safepoint(CodeCache_lock); 1562 1563 // completely deallocate this method 1564 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1565 if (PrintMethodFlushing) { 1566 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1567 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1568 } 1569 1570 // We need to deallocate any ExceptionCache data. 1571 // Note that we do not need to grab the nmethod lock for this, it 1572 // better be thread safe if we're disposing of it! 1573 ExceptionCache* ec = exception_cache(); 1574 set_exception_cache(NULL); 1575 while(ec != NULL) { 1576 ExceptionCache* next = ec->next(); 1577 delete ec; 1578 ec = next; 1579 } 1580 1581 if (on_scavenge_root_list()) { 1582 CodeCache::drop_scavenge_root_nmethod(this); 1583 } 1584 1585 #ifdef SHARK 1586 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1587 #endif // SHARK 1588 1589 ((CodeBlob*)(this))->flush(); 1590 1591 CodeCache::free(this); 1592 } 1593 1594 1595 // 1596 // Notify all classes this nmethod is dependent on that it is no 1597 // longer dependent. This should only be called in two situations. 1598 // First, when a nmethod transitions to a zombie all dependents need 1599 // to be clear. Since zombification happens at a safepoint there's no 1600 // synchronization issues. The second place is a little more tricky. 1601 // During phase 1 of mark sweep class unloading may happen and as a 1602 // result some nmethods may get unloaded. In this case the flushing 1603 // of dependencies must happen during phase 1 since after GC any 1604 // dependencies in the unloaded nmethod won't be updated, so 1605 // traversing the dependency information in unsafe. In that case this 1606 // function is called with a non-NULL argument and this function only 1607 // notifies instanceKlasses that are reachable 1608 1609 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1610 assert_locked_or_safepoint(CodeCache_lock); 1611 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1612 "is_alive is non-NULL if and only if we are called during GC"); 1613 if (!has_flushed_dependencies()) { 1614 set_has_flushed_dependencies(); 1615 for (Dependencies::DepStream deps(this); deps.next(); ) { 1616 Klass* klass = deps.context_type(); 1617 if (klass == NULL) continue; // ignore things like evol_method 1618 1619 // During GC the is_alive closure is non-NULL, and is used to 1620 // determine liveness of dependees that need to be updated. 1621 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1622 // The GC defers deletion of this entry, since there might be multiple threads 1623 // iterating over the _dependencies graph. Other call paths are single-threaded 1624 // and may delete it immediately. 1625 bool delete_immediately = is_alive == NULL; 1626 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1627 } 1628 } 1629 } 1630 } 1631 1632 1633 // If this oop is not live, the nmethod can be unloaded. 1634 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1635 assert(root != NULL, "just checking"); 1636 oop obj = *root; 1637 if (obj == NULL || is_alive->do_object_b(obj)) { 1638 return false; 1639 } 1640 1641 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1642 // simply because one of its constant oops has gone dead. 1643 // No actual classes need to be unloaded in order for this to occur. 1644 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1645 make_unloaded(is_alive, obj); 1646 return true; 1647 } 1648 1649 // ------------------------------------------------------------------ 1650 // post_compiled_method_load_event 1651 // new method for install_code() path 1652 // Transfer information from compilation to jvmti 1653 void nmethod::post_compiled_method_load_event() { 1654 1655 Method* moop = method(); 1656 #ifndef USDT2 1657 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1658 moop->klass_name()->bytes(), 1659 moop->klass_name()->utf8_length(), 1660 moop->name()->bytes(), 1661 moop->name()->utf8_length(), 1662 moop->signature()->bytes(), 1663 moop->signature()->utf8_length(), 1664 insts_begin(), insts_size()); 1665 #else /* USDT2 */ 1666 HOTSPOT_COMPILED_METHOD_LOAD( 1667 (char *) moop->klass_name()->bytes(), 1668 moop->klass_name()->utf8_length(), 1669 (char *) moop->name()->bytes(), 1670 moop->name()->utf8_length(), 1671 (char *) moop->signature()->bytes(), 1672 moop->signature()->utf8_length(), 1673 insts_begin(), insts_size()); 1674 #endif /* USDT2 */ 1675 1676 if (JvmtiExport::should_post_compiled_method_load() || 1677 JvmtiExport::should_post_compiled_method_unload()) { 1678 get_and_cache_jmethod_id(); 1679 } 1680 1681 if (JvmtiExport::should_post_compiled_method_load()) { 1682 // Let the Service thread (which is a real Java thread) post the event 1683 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1684 JvmtiDeferredEventQueue::enqueue( 1685 JvmtiDeferredEvent::compiled_method_load_event(this)); 1686 } 1687 } 1688 1689 jmethodID nmethod::get_and_cache_jmethod_id() { 1690 if (_jmethod_id == NULL) { 1691 // Cache the jmethod_id since it can no longer be looked up once the 1692 // method itself has been marked for unloading. 1693 _jmethod_id = method()->jmethod_id(); 1694 } 1695 return _jmethod_id; 1696 } 1697 1698 void nmethod::post_compiled_method_unload() { 1699 if (unload_reported()) { 1700 // During unloading we transition to unloaded and then to zombie 1701 // and the unloading is reported during the first transition. 1702 return; 1703 } 1704 1705 assert(_method != NULL && !is_unloaded(), "just checking"); 1706 DTRACE_METHOD_UNLOAD_PROBE(method()); 1707 1708 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1709 // post the event. Sometime later this nmethod will be made a zombie 1710 // by the sweeper but the Method* will not be valid at that point. 1711 // If the _jmethod_id is null then no load event was ever requested 1712 // so don't bother posting the unload. The main reason for this is 1713 // that the jmethodID is a weak reference to the Method* so if 1714 // it's being unloaded there's no way to look it up since the weak 1715 // ref will have been cleared. 1716 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1717 assert(!unload_reported(), "already unloaded"); 1718 JvmtiDeferredEvent event = 1719 JvmtiDeferredEvent::compiled_method_unload_event(this, 1720 _jmethod_id, insts_begin()); 1721 if (SafepointSynchronize::is_at_safepoint()) { 1722 // Don't want to take the queueing lock. Add it as pending and 1723 // it will get enqueued later. 1724 JvmtiDeferredEventQueue::add_pending_event(event); 1725 } else { 1726 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1727 JvmtiDeferredEventQueue::enqueue(event); 1728 } 1729 } 1730 1731 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1732 // any time. As the nmethod is being unloaded now we mark it has 1733 // having the unload event reported - this will ensure that we don't 1734 // attempt to report the event in the unlikely scenario where the 1735 // event is enabled at the time the nmethod is made a zombie. 1736 set_unload_reported(); 1737 } 1738 1739 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive, bool mark_on_stack) { 1740 if (ic->is_icholder_call()) { 1741 // The only exception is compiledICHolder oops which may 1742 // yet be marked below. (We check this further below). 1743 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1744 1745 if (mark_on_stack) { 1746 Metadata::mark_on_stack(cichk_oop->holder_method()); 1747 Metadata::mark_on_stack(cichk_oop->holder_klass()); 1748 } 1749 1750 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1751 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1752 return; 1753 } 1754 } else { 1755 Metadata* ic_oop = ic->cached_metadata(); 1756 if (ic_oop != NULL) { 1757 if (mark_on_stack) { 1758 Metadata::mark_on_stack(ic_oop); 1759 } 1760 1761 if (ic_oop->is_klass()) { 1762 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1763 return; 1764 } 1765 } else if (ic_oop->is_method()) { 1766 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1767 return; 1768 } 1769 } else { 1770 ShouldNotReachHere(); 1771 } 1772 } 1773 } 1774 1775 ic->set_to_clean(); 1776 } 1777 1778 // This is called at the end of the strong tracing/marking phase of a 1779 // GC to unload an nmethod if it contains otherwise unreachable 1780 // oops. 1781 1782 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1783 // Make sure the oop's ready to receive visitors 1784 assert(!is_zombie() && !is_unloaded(), 1785 "should not call follow on zombie or unloaded nmethod"); 1786 1787 // If the method is not entrant then a JMP is plastered over the 1788 // first few bytes. If an oop in the old code was there, that oop 1789 // should not get GC'd. Skip the first few bytes of oops on 1790 // not-entrant methods. 1791 address low_boundary = verified_entry_point(); 1792 if (is_not_entrant()) { 1793 low_boundary += NativeJump::instruction_size; 1794 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1795 // (See comment above.) 1796 } 1797 1798 // The RedefineClasses() API can cause the class unloading invariant 1799 // to no longer be true. See jvmtiExport.hpp for details. 1800 // Also, leave a debugging breadcrumb in local flag. 1801 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1802 if (a_class_was_redefined) { 1803 // This set of the unloading_occurred flag is done before the 1804 // call to post_compiled_method_unload() so that the unloading 1805 // of this nmethod is reported. 1806 unloading_occurred = true; 1807 } 1808 1809 // Exception cache 1810 clean_exception_cache(is_alive); 1811 1812 // If class unloading occurred we first iterate over all inline caches and 1813 // clear ICs where the cached oop is referring to an unloaded klass or method. 1814 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1815 // iteration below. 1816 if (unloading_occurred) { 1817 RelocIterator iter(this, low_boundary); 1818 while(iter.next()) { 1819 if (iter.type() == relocInfo::virtual_call_type) { 1820 CompiledIC *ic = CompiledIC_at(&iter); 1821 clean_ic_if_metadata_is_dead(ic, is_alive, false); 1822 } 1823 } 1824 } 1825 1826 // Compiled code 1827 { 1828 RelocIterator iter(this, low_boundary); 1829 while (iter.next()) { 1830 if (iter.type() == relocInfo::oop_type) { 1831 oop_Relocation* r = iter.oop_reloc(); 1832 // In this loop, we must only traverse those oops directly embedded in 1833 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1834 assert(1 == (r->oop_is_immediate()) + 1835 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1836 "oop must be found in exactly one place"); 1837 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1838 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1839 return; 1840 } 1841 } 1842 } 1843 } 1844 } 1845 1846 1847 // Scopes 1848 for (oop* p = oops_begin(); p < oops_end(); p++) { 1849 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1850 if (can_unload(is_alive, p, unloading_occurred)) { 1851 return; 1852 } 1853 } 1854 1855 // Ensure that all metadata is still alive 1856 verify_metadata_loaders(low_boundary, is_alive); 1857 } 1858 1859 template <class CompiledICorStaticCall> 1860 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1861 // Ok, to lookup references to zombies here 1862 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1863 if (cb != NULL && cb->is_nmethod()) { 1864 nmethod* nm = (nmethod*)cb; 1865 1866 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1867 // The nmethod has not been processed yet. 1868 return true; 1869 } 1870 1871 // Clean inline caches pointing to both zombie and not_entrant methods 1872 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1873 ic->set_to_clean(); 1874 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1875 } 1876 } 1877 1878 return false; 1879 } 1880 1881 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1882 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1883 } 1884 1885 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1886 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1887 } 1888 1889 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1890 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1891 1892 oop_Relocation* r = iter_at_oop->oop_reloc(); 1893 // Traverse those oops directly embedded in the code. 1894 // Other oops (oop_index>0) are seen as part of scopes_oops. 1895 assert(1 == (r->oop_is_immediate()) + 1896 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1897 "oop must be found in exactly one place"); 1898 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1899 // Unload this nmethod if the oop is dead. 1900 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1901 return true;; 1902 } 1903 } 1904 1905 return false; 1906 } 1907 1908 void nmethod::mark_metadata_on_stack_at(RelocIterator* iter_at_metadata) { 1909 assert(iter_at_metadata->type() == relocInfo::metadata_type, "Wrong relocation type"); 1910 1911 metadata_Relocation* r = iter_at_metadata->metadata_reloc(); 1912 // In this metadata, we must only follow those metadatas directly embedded in 1913 // the code. Other metadatas (oop_index>0) are seen as part of 1914 // the metadata section below. 1915 assert(1 == (r->metadata_is_immediate()) + 1916 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1917 "metadata must be found in exactly one place"); 1918 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1919 Metadata* md = r->metadata_value(); 1920 if (md != _method) Metadata::mark_on_stack(md); 1921 } 1922 } 1923 1924 void nmethod::mark_metadata_on_stack_non_relocs() { 1925 // Visit the metadata section 1926 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1927 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1928 Metadata* md = *p; 1929 Metadata::mark_on_stack(md); 1930 } 1931 1932 // Visit metadata not embedded in the other places. 1933 if (_method != NULL) Metadata::mark_on_stack(_method); 1934 } 1935 1936 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1937 ResourceMark rm; 1938 1939 // Make sure the oop's ready to receive visitors 1940 assert(!is_zombie() && !is_unloaded(), 1941 "should not call follow on zombie or unloaded nmethod"); 1942 1943 // If the method is not entrant then a JMP is plastered over the 1944 // first few bytes. If an oop in the old code was there, that oop 1945 // should not get GC'd. Skip the first few bytes of oops on 1946 // not-entrant methods. 1947 address low_boundary = verified_entry_point(); 1948 if (is_not_entrant()) { 1949 low_boundary += NativeJump::instruction_size; 1950 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1951 // (See comment above.) 1952 } 1953 1954 // The RedefineClasses() API can cause the class unloading invariant 1955 // to no longer be true. See jvmtiExport.hpp for details. 1956 // Also, leave a debugging breadcrumb in local flag. 1957 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1958 if (a_class_was_redefined) { 1959 // This set of the unloading_occurred flag is done before the 1960 // call to post_compiled_method_unload() so that the unloading 1961 // of this nmethod is reported. 1962 unloading_occurred = true; 1963 } 1964 1965 // When class redefinition is used all metadata in the CodeCache has to be recorded, 1966 // so that unused "previous versions" can be purged. Since walking the CodeCache can 1967 // be expensive, the "mark on stack" is piggy-backed on this parallel unloading code. 1968 bool mark_metadata_on_stack = a_class_was_redefined; 1969 1970 // Exception cache 1971 clean_exception_cache(is_alive); 1972 1973 bool is_unloaded = false; 1974 bool postponed = false; 1975 1976 RelocIterator iter(this, low_boundary); 1977 while(iter.next()) { 1978 1979 switch (iter.type()) { 1980 1981 case relocInfo::virtual_call_type: 1982 if (unloading_occurred) { 1983 // If class unloading occurred we first iterate over all inline caches and 1984 // clear ICs where the cached oop is referring to an unloaded klass or method. 1985 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive, mark_metadata_on_stack); 1986 } 1987 1988 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1989 break; 1990 1991 case relocInfo::opt_virtual_call_type: 1992 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1993 break; 1994 1995 case relocInfo::static_call_type: 1996 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1997 break; 1998 1999 case relocInfo::oop_type: 2000 if (!is_unloaded) { 2001 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 2002 } 2003 break; 2004 2005 case relocInfo::metadata_type: 2006 if (mark_metadata_on_stack) { 2007 mark_metadata_on_stack_at(&iter); 2008 } 2009 } 2010 } 2011 2012 if (mark_metadata_on_stack) { 2013 mark_metadata_on_stack_non_relocs(); 2014 } 2015 2016 if (is_unloaded) { 2017 return postponed; 2018 } 2019 2020 // Scopes 2021 for (oop* p = oops_begin(); p < oops_end(); p++) { 2022 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2023 if (can_unload(is_alive, p, unloading_occurred)) { 2024 is_unloaded = true; 2025 break; 2026 } 2027 } 2028 2029 if (is_unloaded) { 2030 return postponed; 2031 } 2032 2033 // Ensure that all metadata is still alive 2034 verify_metadata_loaders(low_boundary, is_alive); 2035 2036 return postponed; 2037 } 2038 2039 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2040 ResourceMark rm; 2041 2042 // Make sure the oop's ready to receive visitors 2043 assert(!is_zombie(), 2044 "should not call follow on zombie nmethod"); 2045 2046 // If the method is not entrant then a JMP is plastered over the 2047 // first few bytes. If an oop in the old code was there, that oop 2048 // should not get GC'd. Skip the first few bytes of oops on 2049 // not-entrant methods. 2050 address low_boundary = verified_entry_point(); 2051 if (is_not_entrant()) { 2052 low_boundary += NativeJump::instruction_size; 2053 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2054 // (See comment above.) 2055 } 2056 2057 RelocIterator iter(this, low_boundary); 2058 while(iter.next()) { 2059 2060 switch (iter.type()) { 2061 2062 case relocInfo::virtual_call_type: 2063 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2064 break; 2065 2066 case relocInfo::opt_virtual_call_type: 2067 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2068 break; 2069 2070 case relocInfo::static_call_type: 2071 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2072 break; 2073 } 2074 } 2075 } 2076 2077 #ifdef ASSERT 2078 2079 class CheckClass : AllStatic { 2080 static BoolObjectClosure* _is_alive; 2081 2082 // Check class_loader is alive for this bit of metadata. 2083 static void check_class(Metadata* md) { 2084 Klass* klass = NULL; 2085 if (md->is_klass()) { 2086 klass = ((Klass*)md); 2087 } else if (md->is_method()) { 2088 klass = ((Method*)md)->method_holder(); 2089 } else if (md->is_methodData()) { 2090 klass = ((MethodData*)md)->method()->method_holder(); 2091 } else { 2092 md->print(); 2093 ShouldNotReachHere(); 2094 } 2095 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2096 } 2097 public: 2098 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2099 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2100 _is_alive = is_alive; 2101 nm->metadata_do(check_class); 2102 } 2103 }; 2104 2105 // This is called during a safepoint so can use static data 2106 BoolObjectClosure* CheckClass::_is_alive = NULL; 2107 #endif // ASSERT 2108 2109 2110 // Processing of oop references should have been sufficient to keep 2111 // all strong references alive. Any weak references should have been 2112 // cleared as well. Visit all the metadata and ensure that it's 2113 // really alive. 2114 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2115 #ifdef ASSERT 2116 RelocIterator iter(this, low_boundary); 2117 while (iter.next()) { 2118 // static_stub_Relocations may have dangling references to 2119 // Method*s so trim them out here. Otherwise it looks like 2120 // compiled code is maintaining a link to dead metadata. 2121 address static_call_addr = NULL; 2122 if (iter.type() == relocInfo::opt_virtual_call_type) { 2123 CompiledIC* cic = CompiledIC_at(&iter); 2124 if (!cic->is_call_to_interpreted()) { 2125 static_call_addr = iter.addr(); 2126 } 2127 } else if (iter.type() == relocInfo::static_call_type) { 2128 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2129 if (!csc->is_call_to_interpreted()) { 2130 static_call_addr = iter.addr(); 2131 } 2132 } 2133 if (static_call_addr != NULL) { 2134 RelocIterator sciter(this, low_boundary); 2135 while (sciter.next()) { 2136 if (sciter.type() == relocInfo::static_stub_type && 2137 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2138 sciter.static_stub_reloc()->clear_inline_cache(); 2139 } 2140 } 2141 } 2142 } 2143 // Check that the metadata embedded in the nmethod is alive 2144 CheckClass::do_check_class(is_alive, this); 2145 #endif 2146 } 2147 2148 2149 // Iterate over metadata calling this function. Used by RedefineClasses 2150 void nmethod::metadata_do(void f(Metadata*)) { 2151 address low_boundary = verified_entry_point(); 2152 if (is_not_entrant()) { 2153 low_boundary += NativeJump::instruction_size; 2154 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2155 // (See comment above.) 2156 } 2157 { 2158 // Visit all immediate references that are embedded in the instruction stream. 2159 RelocIterator iter(this, low_boundary); 2160 while (iter.next()) { 2161 if (iter.type() == relocInfo::metadata_type ) { 2162 metadata_Relocation* r = iter.metadata_reloc(); 2163 // In this metadata, we must only follow those metadatas directly embedded in 2164 // the code. Other metadatas (oop_index>0) are seen as part of 2165 // the metadata section below. 2166 assert(1 == (r->metadata_is_immediate()) + 2167 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2168 "metadata must be found in exactly one place"); 2169 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2170 Metadata* md = r->metadata_value(); 2171 f(md); 2172 } 2173 } else if (iter.type() == relocInfo::virtual_call_type) { 2174 // Check compiledIC holders associated with this nmethod 2175 CompiledIC *ic = CompiledIC_at(&iter); 2176 if (ic->is_icholder_call()) { 2177 CompiledICHolder* cichk = ic->cached_icholder(); 2178 f(cichk->holder_method()); 2179 f(cichk->holder_klass()); 2180 } else { 2181 Metadata* ic_oop = ic->cached_metadata(); 2182 if (ic_oop != NULL) { 2183 f(ic_oop); 2184 } 2185 } 2186 } 2187 } 2188 } 2189 2190 // Visit the metadata section 2191 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2192 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2193 Metadata* md = *p; 2194 f(md); 2195 } 2196 2197 // Visit metadata not embedded in the other places. 2198 if (_method != NULL) f(_method); 2199 } 2200 2201 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2202 // make sure the oops ready to receive visitors 2203 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2204 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2205 2206 // If the method is not entrant or zombie then a JMP is plastered over the 2207 // first few bytes. If an oop in the old code was there, that oop 2208 // should not get GC'd. Skip the first few bytes of oops on 2209 // not-entrant methods. 2210 address low_boundary = verified_entry_point(); 2211 if (is_not_entrant()) { 2212 low_boundary += NativeJump::instruction_size; 2213 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2214 // (See comment above.) 2215 } 2216 2217 RelocIterator iter(this, low_boundary); 2218 2219 while (iter.next()) { 2220 if (iter.type() == relocInfo::oop_type ) { 2221 oop_Relocation* r = iter.oop_reloc(); 2222 // In this loop, we must only follow those oops directly embedded in 2223 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2224 assert(1 == (r->oop_is_immediate()) + 2225 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2226 "oop must be found in exactly one place"); 2227 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2228 f->do_oop(r->oop_addr()); 2229 } 2230 } 2231 } 2232 2233 // Scopes 2234 // This includes oop constants not inlined in the code stream. 2235 for (oop* p = oops_begin(); p < oops_end(); p++) { 2236 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2237 f->do_oop(p); 2238 } 2239 } 2240 2241 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2242 2243 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2244 2245 // An nmethod is "marked" if its _mark_link is set non-null. 2246 // Even if it is the end of the linked list, it will have a non-null link value, 2247 // as long as it is on the list. 2248 // This code must be MP safe, because it is used from parallel GC passes. 2249 bool nmethod::test_set_oops_do_mark() { 2250 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2251 nmethod* observed_mark_link = _oops_do_mark_link; 2252 if (observed_mark_link == NULL) { 2253 // Claim this nmethod for this thread to mark. 2254 observed_mark_link = (nmethod*) 2255 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2256 if (observed_mark_link == NULL) { 2257 2258 // Atomically append this nmethod (now claimed) to the head of the list: 2259 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2260 for (;;) { 2261 nmethod* required_mark_nmethods = observed_mark_nmethods; 2262 _oops_do_mark_link = required_mark_nmethods; 2263 observed_mark_nmethods = (nmethod*) 2264 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2265 if (observed_mark_nmethods == required_mark_nmethods) 2266 break; 2267 } 2268 // Mark was clear when we first saw this guy. 2269 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2270 return false; 2271 } 2272 } 2273 // On fall through, another racing thread marked this nmethod before we did. 2274 return true; 2275 } 2276 2277 void nmethod::oops_do_marking_prologue() { 2278 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2279 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2280 // We use cmpxchg_ptr instead of regular assignment here because the user 2281 // may fork a bunch of threads, and we need them all to see the same state. 2282 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2283 guarantee(observed == NULL, "no races in this sequential code"); 2284 } 2285 2286 void nmethod::oops_do_marking_epilogue() { 2287 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2288 nmethod* cur = _oops_do_mark_nmethods; 2289 while (cur != NMETHOD_SENTINEL) { 2290 assert(cur != NULL, "not NULL-terminated"); 2291 nmethod* next = cur->_oops_do_mark_link; 2292 cur->_oops_do_mark_link = NULL; 2293 cur->verify_oop_relocations(); 2294 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2295 cur = next; 2296 } 2297 void* required = _oops_do_mark_nmethods; 2298 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2299 guarantee(observed == required, "no races in this sequential code"); 2300 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2301 } 2302 2303 class DetectScavengeRoot: public OopClosure { 2304 bool _detected_scavenge_root; 2305 public: 2306 DetectScavengeRoot() : _detected_scavenge_root(false) 2307 { NOT_PRODUCT(_print_nm = NULL); } 2308 bool detected_scavenge_root() { return _detected_scavenge_root; } 2309 virtual void do_oop(oop* p) { 2310 if ((*p) != NULL && (*p)->is_scavengable()) { 2311 NOT_PRODUCT(maybe_print(p)); 2312 _detected_scavenge_root = true; 2313 } 2314 } 2315 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2316 2317 #ifndef PRODUCT 2318 nmethod* _print_nm; 2319 void maybe_print(oop* p) { 2320 if (_print_nm == NULL) return; 2321 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2322 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 2323 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2324 (void *)(*p), (intptr_t)p); 2325 (*p)->print(); 2326 } 2327 #endif //PRODUCT 2328 }; 2329 2330 bool nmethod::detect_scavenge_root_oops() { 2331 DetectScavengeRoot detect_scavenge_root; 2332 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2333 oops_do(&detect_scavenge_root); 2334 return detect_scavenge_root.detected_scavenge_root(); 2335 } 2336 2337 // Method that knows how to preserve outgoing arguments at call. This method must be 2338 // called with a frame corresponding to a Java invoke 2339 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2340 #ifndef SHARK 2341 if (!method()->is_native()) { 2342 SimpleScopeDesc ssd(this, fr.pc()); 2343 Bytecode_invoke call(ssd.method(), ssd.bci()); 2344 bool has_receiver = call.has_receiver(); 2345 bool has_appendix = call.has_appendix(); 2346 Symbol* signature = call.signature(); 2347 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2348 } 2349 #endif // !SHARK 2350 } 2351 2352 2353 oop nmethod::embeddedOop_at(u_char* p) { 2354 RelocIterator iter(this, p, p + 1); 2355 while (iter.next()) 2356 if (iter.type() == relocInfo::oop_type) { 2357 return iter.oop_reloc()->oop_value(); 2358 } 2359 return NULL; 2360 } 2361 2362 2363 inline bool includes(void* p, void* from, void* to) { 2364 return from <= p && p < to; 2365 } 2366 2367 2368 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2369 assert(count >= 2, "must be sentinel values, at least"); 2370 2371 #ifdef ASSERT 2372 // must be sorted and unique; we do a binary search in find_pc_desc() 2373 int prev_offset = pcs[0].pc_offset(); 2374 assert(prev_offset == PcDesc::lower_offset_limit, 2375 "must start with a sentinel"); 2376 for (int i = 1; i < count; i++) { 2377 int this_offset = pcs[i].pc_offset(); 2378 assert(this_offset > prev_offset, "offsets must be sorted"); 2379 prev_offset = this_offset; 2380 } 2381 assert(prev_offset == PcDesc::upper_offset_limit, 2382 "must end with a sentinel"); 2383 #endif //ASSERT 2384 2385 // Search for MethodHandle invokes and tag the nmethod. 2386 for (int i = 0; i < count; i++) { 2387 if (pcs[i].is_method_handle_invoke()) { 2388 set_has_method_handle_invokes(true); 2389 break; 2390 } 2391 } 2392 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2393 2394 int size = count * sizeof(PcDesc); 2395 assert(scopes_pcs_size() >= size, "oob"); 2396 memcpy(scopes_pcs_begin(), pcs, size); 2397 2398 // Adjust the final sentinel downward. 2399 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2400 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2401 last_pc->set_pc_offset(content_size() + 1); 2402 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2403 // Fill any rounding gaps with copies of the last record. 2404 last_pc[1] = last_pc[0]; 2405 } 2406 // The following assert could fail if sizeof(PcDesc) is not 2407 // an integral multiple of oopSize (the rounding term). 2408 // If it fails, change the logic to always allocate a multiple 2409 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2410 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2411 } 2412 2413 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2414 assert(scopes_data_size() >= size, "oob"); 2415 memcpy(scopes_data_begin(), buffer, size); 2416 } 2417 2418 2419 #ifdef ASSERT 2420 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2421 PcDesc* lower = nm->scopes_pcs_begin(); 2422 PcDesc* upper = nm->scopes_pcs_end(); 2423 lower += 1; // exclude initial sentinel 2424 PcDesc* res = NULL; 2425 for (PcDesc* p = lower; p < upper; p++) { 2426 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2427 if (match_desc(p, pc_offset, approximate)) { 2428 if (res == NULL) 2429 res = p; 2430 else 2431 res = (PcDesc*) badAddress; 2432 } 2433 } 2434 return res; 2435 } 2436 #endif 2437 2438 2439 // Finds a PcDesc with real-pc equal to "pc" 2440 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2441 address base_address = code_begin(); 2442 if ((pc < base_address) || 2443 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2444 return NULL; // PC is wildly out of range 2445 } 2446 int pc_offset = (int) (pc - base_address); 2447 2448 // Check the PcDesc cache if it contains the desired PcDesc 2449 // (This as an almost 100% hit rate.) 2450 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2451 if (res != NULL) { 2452 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2453 return res; 2454 } 2455 2456 // Fallback algorithm: quasi-linear search for the PcDesc 2457 // Find the last pc_offset less than the given offset. 2458 // The successor must be the required match, if there is a match at all. 2459 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2460 PcDesc* lower = scopes_pcs_begin(); 2461 PcDesc* upper = scopes_pcs_end(); 2462 upper -= 1; // exclude final sentinel 2463 if (lower >= upper) return NULL; // native method; no PcDescs at all 2464 2465 #define assert_LU_OK \ 2466 /* invariant on lower..upper during the following search: */ \ 2467 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2468 assert(upper->pc_offset() >= pc_offset, "sanity") 2469 assert_LU_OK; 2470 2471 // Use the last successful return as a split point. 2472 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2473 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2474 if (mid->pc_offset() < pc_offset) { 2475 lower = mid; 2476 } else { 2477 upper = mid; 2478 } 2479 2480 // Take giant steps at first (4096, then 256, then 16, then 1) 2481 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2482 const int RADIX = (1 << LOG2_RADIX); 2483 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2484 while ((mid = lower + step) < upper) { 2485 assert_LU_OK; 2486 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2487 if (mid->pc_offset() < pc_offset) { 2488 lower = mid; 2489 } else { 2490 upper = mid; 2491 break; 2492 } 2493 } 2494 assert_LU_OK; 2495 } 2496 2497 // Sneak up on the value with a linear search of length ~16. 2498 while (true) { 2499 assert_LU_OK; 2500 mid = lower + 1; 2501 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2502 if (mid->pc_offset() < pc_offset) { 2503 lower = mid; 2504 } else { 2505 upper = mid; 2506 break; 2507 } 2508 } 2509 #undef assert_LU_OK 2510 2511 if (match_desc(upper, pc_offset, approximate)) { 2512 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2513 _pc_desc_cache.add_pc_desc(upper); 2514 return upper; 2515 } else { 2516 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2517 return NULL; 2518 } 2519 } 2520 2521 2522 bool nmethod::check_all_dependencies() { 2523 bool found_check = false; 2524 // wholesale check of all dependencies 2525 for (Dependencies::DepStream deps(this); deps.next(); ) { 2526 if (deps.check_dependency() != NULL) { 2527 found_check = true; 2528 NOT_DEBUG(break); 2529 } 2530 } 2531 return found_check; // tell caller if we found anything 2532 } 2533 2534 bool nmethod::check_dependency_on(DepChange& changes) { 2535 // What has happened: 2536 // 1) a new class dependee has been added 2537 // 2) dependee and all its super classes have been marked 2538 bool found_check = false; // set true if we are upset 2539 for (Dependencies::DepStream deps(this); deps.next(); ) { 2540 // Evaluate only relevant dependencies. 2541 if (deps.spot_check_dependency_at(changes) != NULL) { 2542 found_check = true; 2543 NOT_DEBUG(break); 2544 } 2545 } 2546 return found_check; 2547 } 2548 2549 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2550 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2551 Array<Method*>* dependee_methods = dependee_ik->methods(); 2552 for (Dependencies::DepStream deps(this); deps.next(); ) { 2553 if (deps.type() == Dependencies::evol_method) { 2554 Method* method = deps.method_argument(0); 2555 for (int j = 0; j < dependee_methods->length(); j++) { 2556 if (dependee_methods->at(j) == method) { 2557 // RC_TRACE macro has an embedded ResourceMark 2558 RC_TRACE(0x01000000, 2559 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2560 _method->method_holder()->external_name(), 2561 _method->name()->as_C_string(), 2562 _method->signature()->as_C_string(), compile_id(), 2563 method->method_holder()->external_name(), 2564 method->name()->as_C_string(), 2565 method->signature()->as_C_string())); 2566 if (TraceDependencies || LogCompilation) 2567 deps.log_dependency(dependee); 2568 return true; 2569 } 2570 } 2571 } 2572 } 2573 return false; 2574 } 2575 2576 // Called from mark_for_deoptimization, when dependee is invalidated. 2577 bool nmethod::is_dependent_on_method(Method* dependee) { 2578 for (Dependencies::DepStream deps(this); deps.next(); ) { 2579 if (deps.type() != Dependencies::evol_method) 2580 continue; 2581 Method* method = deps.method_argument(0); 2582 if (method == dependee) return true; 2583 } 2584 return false; 2585 } 2586 2587 2588 bool nmethod::is_patchable_at(address instr_addr) { 2589 assert(insts_contains(instr_addr), "wrong nmethod used"); 2590 if (is_zombie()) { 2591 // a zombie may never be patched 2592 return false; 2593 } 2594 return true; 2595 } 2596 2597 2598 address nmethod::continuation_for_implicit_exception(address pc) { 2599 // Exception happened outside inline-cache check code => we are inside 2600 // an active nmethod => use cpc to determine a return address 2601 int exception_offset = pc - code_begin(); 2602 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2603 #ifdef ASSERT 2604 if (cont_offset == 0) { 2605 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2606 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2607 HandleMark hm(thread); 2608 ResourceMark rm(thread); 2609 CodeBlob* cb = CodeCache::find_blob(pc); 2610 assert(cb != NULL && cb == this, ""); 2611 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2612 print(); 2613 method()->print_codes(); 2614 print_code(); 2615 print_pcs(); 2616 } 2617 #endif 2618 if (cont_offset == 0) { 2619 // Let the normal error handling report the exception 2620 return NULL; 2621 } 2622 return code_begin() + cont_offset; 2623 } 2624 2625 2626 2627 void nmethod_init() { 2628 // make sure you didn't forget to adjust the filler fields 2629 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2630 } 2631 2632 2633 //------------------------------------------------------------------------------------------- 2634 2635 2636 // QQQ might we make this work from a frame?? 2637 nmethodLocker::nmethodLocker(address pc) { 2638 CodeBlob* cb = CodeCache::find_blob(pc); 2639 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2640 _nm = (nmethod*)cb; 2641 lock_nmethod(_nm); 2642 } 2643 2644 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2645 // should pass zombie_ok == true. 2646 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2647 if (nm == NULL) return; 2648 Atomic::inc(&nm->_lock_count); 2649 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2650 } 2651 2652 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2653 if (nm == NULL) return; 2654 Atomic::dec(&nm->_lock_count); 2655 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2656 } 2657 2658 2659 // ----------------------------------------------------------------------------- 2660 // nmethod::get_deopt_original_pc 2661 // 2662 // Return the original PC for the given PC if: 2663 // (a) the given PC belongs to a nmethod and 2664 // (b) it is a deopt PC 2665 address nmethod::get_deopt_original_pc(const frame* fr) { 2666 if (fr->cb() == NULL) return NULL; 2667 2668 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2669 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2670 return nm->get_original_pc(fr); 2671 2672 return NULL; 2673 } 2674 2675 2676 // ----------------------------------------------------------------------------- 2677 // MethodHandle 2678 2679 bool nmethod::is_method_handle_return(address return_pc) { 2680 if (!has_method_handle_invokes()) return false; 2681 PcDesc* pd = pc_desc_at(return_pc); 2682 if (pd == NULL) 2683 return false; 2684 return pd->is_method_handle_invoke(); 2685 } 2686 2687 2688 // ----------------------------------------------------------------------------- 2689 // Verification 2690 2691 class VerifyOopsClosure: public OopClosure { 2692 nmethod* _nm; 2693 bool _ok; 2694 public: 2695 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2696 bool ok() { return _ok; } 2697 virtual void do_oop(oop* p) { 2698 if ((*p) == NULL || (*p)->is_oop()) return; 2699 if (_ok) { 2700 _nm->print_nmethod(true); 2701 _ok = false; 2702 } 2703 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2704 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2705 } 2706 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2707 }; 2708 2709 void nmethod::verify() { 2710 2711 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2712 // seems odd. 2713 2714 if (is_zombie() || is_not_entrant() || is_unloaded()) 2715 return; 2716 2717 // Make sure all the entry points are correctly aligned for patching. 2718 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2719 2720 // assert(method()->is_oop(), "must be valid"); 2721 2722 ResourceMark rm; 2723 2724 if (!CodeCache::contains(this)) { 2725 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2726 } 2727 2728 if(is_native_method() ) 2729 return; 2730 2731 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2732 if (nm != this) { 2733 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2734 this)); 2735 } 2736 2737 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2738 if (! p->verify(this)) { 2739 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2740 } 2741 } 2742 2743 VerifyOopsClosure voc(this); 2744 oops_do(&voc); 2745 assert(voc.ok(), "embedded oops must be OK"); 2746 verify_scavenge_root_oops(); 2747 2748 verify_scopes(); 2749 } 2750 2751 2752 void nmethod::verify_interrupt_point(address call_site) { 2753 // Verify IC only when nmethod installation is finished. 2754 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2755 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2756 if (is_installed) { 2757 Thread *cur = Thread::current(); 2758 if (CompiledIC_lock->owner() == cur || 2759 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2760 SafepointSynchronize::is_at_safepoint())) { 2761 CompiledIC_at(this, call_site); 2762 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2763 } else { 2764 MutexLocker ml_verify (CompiledIC_lock); 2765 CompiledIC_at(this, call_site); 2766 } 2767 } 2768 2769 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2770 assert(pd != NULL, "PcDesc must exist"); 2771 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2772 pd->obj_decode_offset(), pd->should_reexecute(), 2773 pd->return_oop()); 2774 !sd->is_top(); sd = sd->sender()) { 2775 sd->verify(); 2776 } 2777 } 2778 2779 void nmethod::verify_scopes() { 2780 if( !method() ) return; // Runtime stubs have no scope 2781 if (method()->is_native()) return; // Ignore stub methods. 2782 // iterate through all interrupt point 2783 // and verify the debug information is valid. 2784 RelocIterator iter((nmethod*)this); 2785 while (iter.next()) { 2786 address stub = NULL; 2787 switch (iter.type()) { 2788 case relocInfo::virtual_call_type: 2789 verify_interrupt_point(iter.addr()); 2790 break; 2791 case relocInfo::opt_virtual_call_type: 2792 stub = iter.opt_virtual_call_reloc()->static_stub(); 2793 verify_interrupt_point(iter.addr()); 2794 break; 2795 case relocInfo::static_call_type: 2796 stub = iter.static_call_reloc()->static_stub(); 2797 //verify_interrupt_point(iter.addr()); 2798 break; 2799 case relocInfo::runtime_call_type: 2800 address destination = iter.reloc()->value(); 2801 // Right now there is no way to find out which entries support 2802 // an interrupt point. It would be nice if we had this 2803 // information in a table. 2804 break; 2805 } 2806 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2807 } 2808 } 2809 2810 2811 // ----------------------------------------------------------------------------- 2812 // Non-product code 2813 #ifndef PRODUCT 2814 2815 class DebugScavengeRoot: public OopClosure { 2816 nmethod* _nm; 2817 bool _ok; 2818 public: 2819 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2820 bool ok() { return _ok; } 2821 virtual void do_oop(oop* p) { 2822 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2823 if (_ok) { 2824 _nm->print_nmethod(true); 2825 _ok = false; 2826 } 2827 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2828 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2829 (*p)->print(); 2830 } 2831 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2832 }; 2833 2834 void nmethod::verify_scavenge_root_oops() { 2835 if (UseG1GC) { 2836 return; 2837 } 2838 2839 if (!on_scavenge_root_list()) { 2840 // Actually look inside, to verify the claim that it's clean. 2841 DebugScavengeRoot debug_scavenge_root(this); 2842 oops_do(&debug_scavenge_root); 2843 if (!debug_scavenge_root.ok()) 2844 fatal("found an unadvertised bad scavengable oop in the code cache"); 2845 } 2846 assert(scavenge_root_not_marked(), ""); 2847 } 2848 2849 #endif // PRODUCT 2850 2851 // Printing operations 2852 2853 void nmethod::print() const { 2854 ResourceMark rm; 2855 ttyLocker ttyl; // keep the following output all in one block 2856 2857 tty->print("Compiled method "); 2858 2859 if (is_compiled_by_c1()) { 2860 tty->print("(c1) "); 2861 } else if (is_compiled_by_c2()) { 2862 tty->print("(c2) "); 2863 } else if (is_compiled_by_shark()) { 2864 tty->print("(shark) "); 2865 } else { 2866 tty->print("(nm) "); 2867 } 2868 2869 print_on(tty, NULL); 2870 2871 if (WizardMode) { 2872 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2873 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2874 tty->print(" { "); 2875 if (is_in_use()) tty->print("in_use "); 2876 if (is_not_entrant()) tty->print("not_entrant "); 2877 if (is_zombie()) tty->print("zombie "); 2878 if (is_unloaded()) tty->print("unloaded "); 2879 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2880 tty->print_cr("}:"); 2881 } 2882 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2883 (address)this, 2884 (address)this + size(), 2885 size()); 2886 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2887 relocation_begin(), 2888 relocation_end(), 2889 relocation_size()); 2890 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2891 consts_begin(), 2892 consts_end(), 2893 consts_size()); 2894 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2895 insts_begin(), 2896 insts_end(), 2897 insts_size()); 2898 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2899 stub_begin(), 2900 stub_end(), 2901 stub_size()); 2902 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2903 oops_begin(), 2904 oops_end(), 2905 oops_size()); 2906 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2907 metadata_begin(), 2908 metadata_end(), 2909 metadata_size()); 2910 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2911 scopes_data_begin(), 2912 scopes_data_end(), 2913 scopes_data_size()); 2914 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2915 scopes_pcs_begin(), 2916 scopes_pcs_end(), 2917 scopes_pcs_size()); 2918 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2919 dependencies_begin(), 2920 dependencies_end(), 2921 dependencies_size()); 2922 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2923 handler_table_begin(), 2924 handler_table_end(), 2925 handler_table_size()); 2926 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2927 nul_chk_table_begin(), 2928 nul_chk_table_end(), 2929 nul_chk_table_size()); 2930 } 2931 2932 void nmethod::print_code() { 2933 HandleMark hm; 2934 ResourceMark m; 2935 Disassembler::decode(this); 2936 } 2937 2938 2939 #ifndef PRODUCT 2940 2941 void nmethod::print_scopes() { 2942 // Find the first pc desc for all scopes in the code and print it. 2943 ResourceMark rm; 2944 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2945 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2946 continue; 2947 2948 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2949 sd->print_on(tty, p); 2950 } 2951 } 2952 2953 void nmethod::print_dependencies() { 2954 ResourceMark rm; 2955 ttyLocker ttyl; // keep the following output all in one block 2956 tty->print_cr("Dependencies:"); 2957 for (Dependencies::DepStream deps(this); deps.next(); ) { 2958 deps.print_dependency(); 2959 Klass* ctxk = deps.context_type(); 2960 if (ctxk != NULL) { 2961 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2962 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2963 } 2964 } 2965 deps.log_dependency(); // put it into the xml log also 2966 } 2967 } 2968 2969 2970 void nmethod::print_relocations() { 2971 ResourceMark m; // in case methods get printed via the debugger 2972 tty->print_cr("relocations:"); 2973 RelocIterator iter(this); 2974 iter.print(); 2975 if (UseRelocIndex) { 2976 jint* index_end = (jint*)relocation_end() - 1; 2977 jint index_size = *index_end; 2978 jint* index_start = (jint*)( (address)index_end - index_size ); 2979 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2980 if (index_size > 0) { 2981 jint* ip; 2982 for (ip = index_start; ip+2 <= index_end; ip += 2) 2983 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2984 ip[0], 2985 ip[1], 2986 header_end()+ip[0], 2987 relocation_begin()-1+ip[1]); 2988 for (; ip < index_end; ip++) 2989 tty->print_cr(" (%d ?)", ip[0]); 2990 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2991 ip++; 2992 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2993 } 2994 } 2995 } 2996 2997 2998 void nmethod::print_pcs() { 2999 ResourceMark m; // in case methods get printed via debugger 3000 tty->print_cr("pc-bytecode offsets:"); 3001 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3002 p->print(this); 3003 } 3004 } 3005 3006 #endif // PRODUCT 3007 3008 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3009 RelocIterator iter(this, begin, end); 3010 bool have_one = false; 3011 while (iter.next()) { 3012 have_one = true; 3013 switch (iter.type()) { 3014 case relocInfo::none: return "no_reloc"; 3015 case relocInfo::oop_type: { 3016 stringStream st; 3017 oop_Relocation* r = iter.oop_reloc(); 3018 oop obj = r->oop_value(); 3019 st.print("oop("); 3020 if (obj == NULL) st.print("NULL"); 3021 else obj->print_value_on(&st); 3022 st.print(")"); 3023 return st.as_string(); 3024 } 3025 case relocInfo::metadata_type: { 3026 stringStream st; 3027 metadata_Relocation* r = iter.metadata_reloc(); 3028 Metadata* obj = r->metadata_value(); 3029 st.print("metadata("); 3030 if (obj == NULL) st.print("NULL"); 3031 else obj->print_value_on(&st); 3032 st.print(")"); 3033 return st.as_string(); 3034 } 3035 case relocInfo::virtual_call_type: return "virtual_call"; 3036 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 3037 case relocInfo::static_call_type: return "static_call"; 3038 case relocInfo::static_stub_type: return "static_stub"; 3039 case relocInfo::runtime_call_type: return "runtime_call"; 3040 case relocInfo::external_word_type: return "external_word"; 3041 case relocInfo::internal_word_type: return "internal_word"; 3042 case relocInfo::section_word_type: return "section_word"; 3043 case relocInfo::poll_type: return "poll"; 3044 case relocInfo::poll_return_type: return "poll_return"; 3045 case relocInfo::type_mask: return "type_bit_mask"; 3046 } 3047 } 3048 return have_one ? "other" : NULL; 3049 } 3050 3051 // Return a the last scope in (begin..end] 3052 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3053 PcDesc* p = pc_desc_near(begin+1); 3054 if (p != NULL && p->real_pc(this) <= end) { 3055 return new ScopeDesc(this, p->scope_decode_offset(), 3056 p->obj_decode_offset(), p->should_reexecute(), 3057 p->return_oop()); 3058 } 3059 return NULL; 3060 } 3061 3062 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3063 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3064 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3065 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3066 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3067 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3068 3069 if (has_method_handle_invokes()) 3070 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3071 3072 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3073 3074 if (block_begin == entry_point()) { 3075 methodHandle m = method(); 3076 if (m.not_null()) { 3077 stream->print(" # "); 3078 m->print_value_on(stream); 3079 stream->cr(); 3080 } 3081 if (m.not_null() && !is_osr_method()) { 3082 ResourceMark rm; 3083 int sizeargs = m->size_of_parameters(); 3084 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3085 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3086 { 3087 int sig_index = 0; 3088 if (!m->is_static()) 3089 sig_bt[sig_index++] = T_OBJECT; // 'this' 3090 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3091 BasicType t = ss.type(); 3092 sig_bt[sig_index++] = t; 3093 if (type2size[t] == 2) { 3094 sig_bt[sig_index++] = T_VOID; 3095 } else { 3096 assert(type2size[t] == 1, "size is 1 or 2"); 3097 } 3098 } 3099 assert(sig_index == sizeargs, ""); 3100 } 3101 const char* spname = "sp"; // make arch-specific? 3102 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3103 int stack_slot_offset = this->frame_size() * wordSize; 3104 int tab1 = 14, tab2 = 24; 3105 int sig_index = 0; 3106 int arg_index = (m->is_static() ? 0 : -1); 3107 bool did_old_sp = false; 3108 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3109 bool at_this = (arg_index == -1); 3110 bool at_old_sp = false; 3111 BasicType t = (at_this ? T_OBJECT : ss.type()); 3112 assert(t == sig_bt[sig_index], "sigs in sync"); 3113 if (at_this) 3114 stream->print(" # this: "); 3115 else 3116 stream->print(" # parm%d: ", arg_index); 3117 stream->move_to(tab1); 3118 VMReg fst = regs[sig_index].first(); 3119 VMReg snd = regs[sig_index].second(); 3120 if (fst->is_reg()) { 3121 stream->print("%s", fst->name()); 3122 if (snd->is_valid()) { 3123 stream->print(":%s", snd->name()); 3124 } 3125 } else if (fst->is_stack()) { 3126 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3127 if (offset == stack_slot_offset) at_old_sp = true; 3128 stream->print("[%s+0x%x]", spname, offset); 3129 } else { 3130 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3131 } 3132 stream->print(" "); 3133 stream->move_to(tab2); 3134 stream->print("= "); 3135 if (at_this) { 3136 m->method_holder()->print_value_on(stream); 3137 } else { 3138 bool did_name = false; 3139 if (!at_this && ss.is_object()) { 3140 Symbol* name = ss.as_symbol_or_null(); 3141 if (name != NULL) { 3142 name->print_value_on(stream); 3143 did_name = true; 3144 } 3145 } 3146 if (!did_name) 3147 stream->print("%s", type2name(t)); 3148 } 3149 if (at_old_sp) { 3150 stream->print(" (%s of caller)", spname); 3151 did_old_sp = true; 3152 } 3153 stream->cr(); 3154 sig_index += type2size[t]; 3155 arg_index += 1; 3156 if (!at_this) ss.next(); 3157 } 3158 if (!did_old_sp) { 3159 stream->print(" # "); 3160 stream->move_to(tab1); 3161 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3162 stream->print(" (%s of caller)", spname); 3163 stream->cr(); 3164 } 3165 } 3166 } 3167 } 3168 3169 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3170 // First, find an oopmap in (begin, end]. 3171 // We use the odd half-closed interval so that oop maps and scope descs 3172 // which are tied to the byte after a call are printed with the call itself. 3173 address base = code_begin(); 3174 OopMapSet* oms = oop_maps(); 3175 if (oms != NULL) { 3176 for (int i = 0, imax = oms->size(); i < imax; i++) { 3177 OopMap* om = oms->at(i); 3178 address pc = base + om->offset(); 3179 if (pc > begin) { 3180 if (pc <= end) { 3181 st->move_to(column); 3182 st->print("; "); 3183 om->print_on(st); 3184 } 3185 break; 3186 } 3187 } 3188 } 3189 3190 // Print any debug info present at this pc. 3191 ScopeDesc* sd = scope_desc_in(begin, end); 3192 if (sd != NULL) { 3193 st->move_to(column); 3194 if (sd->bci() == SynchronizationEntryBCI) { 3195 st->print(";*synchronization entry"); 3196 } else { 3197 if (sd->method() == NULL) { 3198 st->print("method is NULL"); 3199 } else if (sd->method()->is_native()) { 3200 st->print("method is native"); 3201 } else { 3202 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3203 st->print(";*%s", Bytecodes::name(bc)); 3204 switch (bc) { 3205 case Bytecodes::_invokevirtual: 3206 case Bytecodes::_invokespecial: 3207 case Bytecodes::_invokestatic: 3208 case Bytecodes::_invokeinterface: 3209 { 3210 Bytecode_invoke invoke(sd->method(), sd->bci()); 3211 st->print(" "); 3212 if (invoke.name() != NULL) 3213 invoke.name()->print_symbol_on(st); 3214 else 3215 st->print("<UNKNOWN>"); 3216 break; 3217 } 3218 case Bytecodes::_getfield: 3219 case Bytecodes::_putfield: 3220 case Bytecodes::_getstatic: 3221 case Bytecodes::_putstatic: 3222 { 3223 Bytecode_field field(sd->method(), sd->bci()); 3224 st->print(" "); 3225 if (field.name() != NULL) 3226 field.name()->print_symbol_on(st); 3227 else 3228 st->print("<UNKNOWN>"); 3229 } 3230 } 3231 } 3232 } 3233 3234 // Print all scopes 3235 for (;sd != NULL; sd = sd->sender()) { 3236 st->move_to(column); 3237 st->print("; -"); 3238 if (sd->method() == NULL) { 3239 st->print("method is NULL"); 3240 } else { 3241 sd->method()->print_short_name(st); 3242 } 3243 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3244 if (lineno != -1) { 3245 st->print("@%d (line %d)", sd->bci(), lineno); 3246 } else { 3247 st->print("@%d", sd->bci()); 3248 } 3249 st->cr(); 3250 } 3251 } 3252 3253 // Print relocation information 3254 const char* str = reloc_string_for(begin, end); 3255 if (str != NULL) { 3256 if (sd != NULL) st->cr(); 3257 st->move_to(column); 3258 st->print("; {%s}", str); 3259 } 3260 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3261 if (cont_offset != 0) { 3262 st->move_to(column); 3263 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3264 } 3265 3266 } 3267 3268 #ifndef PRODUCT 3269 3270 void nmethod::print_value_on(outputStream* st) const { 3271 st->print("nmethod"); 3272 print_on(st, NULL); 3273 } 3274 3275 void nmethod::print_calls(outputStream* st) { 3276 RelocIterator iter(this); 3277 while (iter.next()) { 3278 switch (iter.type()) { 3279 case relocInfo::virtual_call_type: 3280 case relocInfo::opt_virtual_call_type: { 3281 VerifyMutexLocker mc(CompiledIC_lock); 3282 CompiledIC_at(&iter)->print(); 3283 break; 3284 } 3285 case relocInfo::static_call_type: 3286 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3287 compiledStaticCall_at(iter.reloc())->print(); 3288 break; 3289 } 3290 } 3291 } 3292 3293 void nmethod::print_handler_table() { 3294 ExceptionHandlerTable(this).print(); 3295 } 3296 3297 void nmethod::print_nul_chk_table() { 3298 ImplicitExceptionTable(this).print(code_begin()); 3299 } 3300 3301 void nmethod::print_statistics() { 3302 ttyLocker ttyl; 3303 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3304 nmethod_stats.print_native_nmethod_stats(); 3305 nmethod_stats.print_nmethod_stats(); 3306 DebugInformationRecorder::print_statistics(); 3307 nmethod_stats.print_pc_stats(); 3308 Dependencies::print_statistics(); 3309 if (xtty != NULL) xtty->tail("statistics"); 3310 } 3311 3312 #endif // PRODUCT