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/atomic.inline.hpp" 41 #include "runtime/orderAccess.inline.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 #include "runtime/sweeper.hpp" 44 #include "utilities/resourceHash.hpp" 45 #include "utilities/dtrace.hpp" 46 #include "utilities/events.hpp" 47 #include "utilities/xmlstream.hpp" 48 #ifdef SHARK 49 #include "shark/sharkCompiler.hpp" 50 #endif 51 52 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 53 54 unsigned char nmethod::_global_unloading_clock = 0; 55 56 #ifdef DTRACE_ENABLED 57 58 // Only bother with this argument setup if dtrace is available 59 60 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 61 { \ 62 Method* m = (method); \ 63 if (m != NULL) { \ 64 Symbol* klass_name = m->klass_name(); \ 65 Symbol* name = m->name(); \ 66 Symbol* signature = m->signature(); \ 67 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 68 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 69 (char *) name->bytes(), name->utf8_length(), \ 70 (char *) signature->bytes(), signature->utf8_length()); \ 71 } \ 72 } 73 74 #else // ndef DTRACE_ENABLED 75 76 #define DTRACE_METHOD_UNLOAD_PROBE(method) 77 78 #endif 79 80 bool nmethod::is_compiled_by_c1() const { 81 if (compiler() == NULL) { 82 return false; 83 } 84 return compiler()->is_c1(); 85 } 86 bool nmethod::is_compiled_by_c2() const { 87 if (compiler() == NULL) { 88 return false; 89 } 90 return compiler()->is_c2(); 91 } 92 bool nmethod::is_compiled_by_shark() const { 93 if (compiler() == NULL) { 94 return false; 95 } 96 return compiler()->is_shark(); 97 } 98 99 100 101 //--------------------------------------------------------------------------------- 102 // NMethod statistics 103 // They are printed under various flags, including: 104 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 105 // (In the latter two cases, they like other stats are printed to the log only.) 106 107 #ifndef PRODUCT 108 // These variables are put into one block to reduce relocations 109 // and make it simpler to print from the debugger. 110 static 111 struct nmethod_stats_struct { 112 int nmethod_count; 113 int total_size; 114 int relocation_size; 115 int consts_size; 116 int insts_size; 117 int stub_size; 118 int scopes_data_size; 119 int scopes_pcs_size; 120 int dependencies_size; 121 int handler_table_size; 122 int nul_chk_table_size; 123 int oops_size; 124 125 void note_nmethod(nmethod* nm) { 126 nmethod_count += 1; 127 total_size += nm->size(); 128 relocation_size += nm->relocation_size(); 129 consts_size += nm->consts_size(); 130 insts_size += nm->insts_size(); 131 stub_size += nm->stub_size(); 132 oops_size += nm->oops_size(); 133 scopes_data_size += nm->scopes_data_size(); 134 scopes_pcs_size += nm->scopes_pcs_size(); 135 dependencies_size += nm->dependencies_size(); 136 handler_table_size += nm->handler_table_size(); 137 nul_chk_table_size += nm->nul_chk_table_size(); 138 } 139 void print_nmethod_stats() { 140 if (nmethod_count == 0) return; 141 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 142 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 143 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 144 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 145 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 146 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 147 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 148 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 149 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 150 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 151 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 152 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 153 } 154 155 int native_nmethod_count; 156 int native_total_size; 157 int native_relocation_size; 158 int native_insts_size; 159 int native_oops_size; 160 void note_native_nmethod(nmethod* nm) { 161 native_nmethod_count += 1; 162 native_total_size += nm->size(); 163 native_relocation_size += nm->relocation_size(); 164 native_insts_size += nm->insts_size(); 165 native_oops_size += nm->oops_size(); 166 } 167 void print_native_nmethod_stats() { 168 if (native_nmethod_count == 0) return; 169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 174 } 175 176 int pc_desc_resets; // number of resets (= number of caches) 177 int pc_desc_queries; // queries to nmethod::find_pc_desc 178 int pc_desc_approx; // number of those which have approximate true 179 int pc_desc_repeats; // number of _pc_descs[0] hits 180 int pc_desc_hits; // number of LRU cache hits 181 int pc_desc_tests; // total number of PcDesc examinations 182 int pc_desc_searches; // total number of quasi-binary search steps 183 int pc_desc_adds; // number of LUR cache insertions 184 185 void print_pc_stats() { 186 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 187 pc_desc_queries, 188 (double)(pc_desc_tests + pc_desc_searches) 189 / pc_desc_queries); 190 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 191 pc_desc_resets, 192 pc_desc_queries, pc_desc_approx, 193 pc_desc_repeats, pc_desc_hits, 194 pc_desc_tests, pc_desc_searches, pc_desc_adds); 195 } 196 } nmethod_stats; 197 #endif //PRODUCT 198 199 200 //--------------------------------------------------------------------------------- 201 202 203 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 204 assert(pc != NULL, "Must be non null"); 205 assert(exception.not_null(), "Must be non null"); 206 assert(handler != NULL, "Must be non null"); 207 208 _count = 0; 209 _exception_type = exception->klass(); 210 _next = NULL; 211 212 add_address_and_handler(pc,handler); 213 } 214 215 216 address ExceptionCache::match(Handle exception, address pc) { 217 assert(pc != NULL,"Must be non null"); 218 assert(exception.not_null(),"Must be non null"); 219 if (exception->klass() == exception_type()) { 220 return (test_address(pc)); 221 } 222 223 return NULL; 224 } 225 226 227 bool ExceptionCache::match_exception_with_space(Handle exception) { 228 assert(exception.not_null(),"Must be non null"); 229 if (exception->klass() == exception_type() && count() < cache_size) { 230 return true; 231 } 232 return false; 233 } 234 235 236 address ExceptionCache::test_address(address addr) { 237 for (int i=0; i<count(); i++) { 238 if (pc_at(i) == addr) { 239 return handler_at(i); 240 } 241 } 242 return NULL; 243 } 244 245 246 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 247 if (test_address(addr) == handler) return true; 248 if (count() < cache_size) { 249 set_pc_at(count(),addr); 250 set_handler_at(count(), handler); 251 increment_count(); 252 return true; 253 } 254 return false; 255 } 256 257 258 // private method for handling exception cache 259 // These methods are private, and used to manipulate the exception cache 260 // directly. 261 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 262 ExceptionCache* ec = exception_cache(); 263 while (ec != NULL) { 264 if (ec->match_exception_with_space(exception)) { 265 return ec; 266 } 267 ec = ec->next(); 268 } 269 return NULL; 270 } 271 272 273 //----------------------------------------------------------------------------- 274 275 276 // Helper used by both find_pc_desc methods. 277 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 278 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 279 if (!approximate) 280 return pc->pc_offset() == pc_offset; 281 else 282 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 283 } 284 285 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 286 if (initial_pc_desc == NULL) { 287 _pc_descs[0] = NULL; // native method; no PcDescs at all 288 return; 289 } 290 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 291 // reset the cache by filling it with benign (non-null) values 292 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 293 for (int i = 0; i < cache_size; i++) 294 _pc_descs[i] = initial_pc_desc; 295 } 296 297 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 298 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 299 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 300 301 // Note: one might think that caching the most recently 302 // read value separately would be a win, but one would be 303 // wrong. When many threads are updating it, the cache 304 // line it's in would bounce between caches, negating 305 // any benefit. 306 307 // In order to prevent race conditions do not load cache elements 308 // repeatedly, but use a local copy: 309 PcDesc* res; 310 311 // Step one: Check the most recently added value. 312 res = _pc_descs[0]; 313 if (res == NULL) return NULL; // native method; no PcDescs at all 314 if (match_desc(res, pc_offset, approximate)) { 315 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 316 return res; 317 } 318 319 // Step two: Check the rest of the LRU cache. 320 for (int i = 1; i < cache_size; ++i) { 321 res = _pc_descs[i]; 322 if (res->pc_offset() < 0) break; // optimization: skip empty cache 323 if (match_desc(res, pc_offset, approximate)) { 324 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 325 return res; 326 } 327 } 328 329 // Report failure. 330 return NULL; 331 } 332 333 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 334 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 335 // Update the LRU cache by shifting pc_desc forward. 336 for (int i = 0; i < cache_size; i++) { 337 PcDesc* next = _pc_descs[i]; 338 _pc_descs[i] = pc_desc; 339 pc_desc = next; 340 } 341 } 342 343 // adjust pcs_size so that it is a multiple of both oopSize and 344 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 345 // of oopSize, then 2*sizeof(PcDesc) is) 346 static int adjust_pcs_size(int pcs_size) { 347 int nsize = round_to(pcs_size, oopSize); 348 if ((nsize % sizeof(PcDesc)) != 0) { 349 nsize = pcs_size + sizeof(PcDesc); 350 } 351 assert((nsize % oopSize) == 0, "correct alignment"); 352 return nsize; 353 } 354 355 //----------------------------------------------------------------------------- 356 357 358 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 359 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 360 assert(new_entry != NULL,"Must be non null"); 361 assert(new_entry->next() == NULL, "Must be null"); 362 363 if (exception_cache() != NULL) { 364 new_entry->set_next(exception_cache()); 365 } 366 set_exception_cache(new_entry); 367 } 368 369 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 370 ExceptionCache* prev = NULL; 371 ExceptionCache* curr = exception_cache(); 372 373 while (curr != NULL) { 374 ExceptionCache* next = curr->next(); 375 376 Klass* ex_klass = curr->exception_type(); 377 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 378 if (prev == NULL) { 379 set_exception_cache(next); 380 } else { 381 prev->set_next(next); 382 } 383 delete curr; 384 // prev stays the same. 385 } else { 386 prev = curr; 387 } 388 389 curr = next; 390 } 391 } 392 393 // public method for accessing the exception cache 394 // These are the public access methods. 395 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 396 // We never grab a lock to read the exception cache, so we may 397 // have false negatives. This is okay, as it can only happen during 398 // the first few exception lookups for a given nmethod. 399 ExceptionCache* ec = exception_cache(); 400 while (ec != NULL) { 401 address ret_val; 402 if ((ret_val = ec->match(exception,pc)) != NULL) { 403 return ret_val; 404 } 405 ec = ec->next(); 406 } 407 return NULL; 408 } 409 410 411 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 412 // There are potential race conditions during exception cache updates, so we 413 // must own the ExceptionCache_lock before doing ANY modifications. Because 414 // we don't lock during reads, it is possible to have several threads attempt 415 // to update the cache with the same data. We need to check for already inserted 416 // copies of the current data before adding it. 417 418 MutexLocker ml(ExceptionCache_lock); 419 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 420 421 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 422 target_entry = new ExceptionCache(exception,pc,handler); 423 add_exception_cache_entry(target_entry); 424 } 425 } 426 427 428 //-------------end of code for ExceptionCache-------------- 429 430 431 int nmethod::total_size() const { 432 return 433 consts_size() + 434 insts_size() + 435 stub_size() + 436 scopes_data_size() + 437 scopes_pcs_size() + 438 handler_table_size() + 439 nul_chk_table_size(); 440 } 441 442 const char* nmethod::compile_kind() const { 443 if (is_osr_method()) return "osr"; 444 if (method() != NULL && is_native_method()) return "c2n"; 445 return NULL; 446 } 447 448 // Fill in default values for various flag fields 449 void nmethod::init_defaults() { 450 _state = in_use; 451 _unloading_clock = 0; 452 _marked_for_reclamation = 0; 453 _has_flushed_dependencies = 0; 454 _has_unsafe_access = 0; 455 _has_method_handle_invokes = 0; 456 _lazy_critical_native = 0; 457 _has_wide_vectors = 0; 458 _marked_for_deoptimization = 0; 459 _lock_count = 0; 460 _stack_traversal_mark = 0; 461 _unload_reported = false; // jvmti state 462 463 #ifdef ASSERT 464 _oops_are_stale = false; 465 #endif 466 467 _oops_do_mark_link = NULL; 468 _jmethod_id = NULL; 469 _osr_link = NULL; 470 if (UseG1GC) { 471 _unloading_next = NULL; 472 } else { 473 _scavenge_root_link = NULL; 474 } 475 _scavenge_root_state = 0; 476 _compiler = NULL; 477 #if INCLUDE_RTM_OPT 478 _rtm_state = NoRTM; 479 #endif 480 #ifdef HAVE_DTRACE_H 481 _trap_offset = 0; 482 #endif // def HAVE_DTRACE_H 483 } 484 485 nmethod* nmethod::new_native_nmethod(methodHandle method, 486 int compile_id, 487 CodeBuffer *code_buffer, 488 int vep_offset, 489 int frame_complete, 490 int frame_size, 491 ByteSize basic_lock_owner_sp_offset, 492 ByteSize basic_lock_sp_offset, 493 OopMapSet* oop_maps) { 494 code_buffer->finalize_oop_references(method); 495 // create nmethod 496 nmethod* nm = NULL; 497 { 498 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 499 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 500 CodeOffsets offsets; 501 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 502 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 503 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 504 compile_id, &offsets, 505 code_buffer, frame_size, 506 basic_lock_owner_sp_offset, 507 basic_lock_sp_offset, oop_maps); 508 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 509 if (PrintAssembly && nm != NULL) { 510 Disassembler::decode(nm); 511 } 512 } 513 // verify nmethod 514 debug_only(if (nm) nm->verify();) // might block 515 516 if (nm != NULL) { 517 nm->log_new_nmethod(); 518 } 519 520 return nm; 521 } 522 523 #ifdef HAVE_DTRACE_H 524 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 525 CodeBuffer *code_buffer, 526 int vep_offset, 527 int trap_offset, 528 int frame_complete, 529 int frame_size) { 530 code_buffer->finalize_oop_references(method); 531 // create nmethod 532 nmethod* nm = NULL; 533 { 534 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 535 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 536 CodeOffsets offsets; 537 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 538 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 539 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 540 541 nm = new (nmethod_size, CompLevel_none) nmethod(method(), nmethod_size, 542 &offsets, code_buffer, frame_size); 543 544 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 545 if (PrintAssembly && nm != NULL) { 546 Disassembler::decode(nm); 547 } 548 } 549 // verify nmethod 550 debug_only(if (nm) nm->verify();) // might block 551 552 if (nm != NULL) { 553 nm->log_new_nmethod(); 554 } 555 556 return nm; 557 } 558 559 #endif // def HAVE_DTRACE_H 560 561 nmethod* nmethod::new_nmethod(methodHandle method, 562 int compile_id, 563 int entry_bci, 564 CodeOffsets* offsets, 565 int orig_pc_offset, 566 DebugInformationRecorder* debug_info, 567 Dependencies* dependencies, 568 CodeBuffer* code_buffer, int frame_size, 569 OopMapSet* oop_maps, 570 ExceptionHandlerTable* handler_table, 571 ImplicitExceptionTable* nul_chk_table, 572 AbstractCompiler* compiler, 573 int comp_level 574 ) 575 { 576 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 577 code_buffer->finalize_oop_references(method); 578 // create nmethod 579 nmethod* nm = NULL; 580 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 581 int nmethod_size = 582 allocation_size(code_buffer, sizeof(nmethod)) 583 + adjust_pcs_size(debug_info->pcs_size()) 584 + round_to(dependencies->size_in_bytes() , oopSize) 585 + round_to(handler_table->size_in_bytes(), oopSize) 586 + round_to(nul_chk_table->size_in_bytes(), oopSize) 587 + round_to(debug_info->data_size() , oopSize); 588 589 nm = new (nmethod_size, comp_level) 590 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 591 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 592 oop_maps, 593 handler_table, 594 nul_chk_table, 595 compiler, 596 comp_level); 597 598 if (nm != NULL) { 599 // To make dependency checking during class loading fast, record 600 // the nmethod dependencies in the classes it is dependent on. 601 // This allows the dependency checking code to simply walk the 602 // class hierarchy above the loaded class, checking only nmethods 603 // which are dependent on those classes. The slow way is to 604 // check every nmethod for dependencies which makes it linear in 605 // the number of methods compiled. For applications with a lot 606 // classes the slow way is too slow. 607 for (Dependencies::DepStream deps(nm); deps.next(); ) { 608 Klass* klass = deps.context_type(); 609 if (klass == NULL) { 610 continue; // ignore things like evol_method 611 } 612 613 // record this nmethod as dependent on this klass 614 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 615 } 616 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 617 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 618 Disassembler::decode(nm); 619 } 620 } 621 } 622 // Do verification and logging outside CodeCache_lock. 623 if (nm != NULL) { 624 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 625 DEBUG_ONLY(nm->verify();) 626 nm->log_new_nmethod(); 627 } 628 return nm; 629 } 630 631 632 // For native wrappers 633 nmethod::nmethod( 634 Method* method, 635 int nmethod_size, 636 int compile_id, 637 CodeOffsets* offsets, 638 CodeBuffer* code_buffer, 639 int frame_size, 640 ByteSize basic_lock_owner_sp_offset, 641 ByteSize basic_lock_sp_offset, 642 OopMapSet* oop_maps ) 643 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 644 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 645 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 646 _native_basic_lock_sp_offset(basic_lock_sp_offset) 647 { 648 { 649 debug_only(No_Safepoint_Verifier nsv;) 650 assert_locked_or_safepoint(CodeCache_lock); 651 652 init_defaults(); 653 _method = method; 654 _entry_bci = InvocationEntryBci; 655 // We have no exception handler or deopt handler make the 656 // values something that will never match a pc like the nmethod vtable entry 657 _exception_offset = 0; 658 _deoptimize_offset = 0; 659 _deoptimize_mh_offset = 0; 660 _orig_pc_offset = 0; 661 662 _consts_offset = data_offset(); 663 _stub_offset = data_offset(); 664 _oops_offset = data_offset(); 665 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 666 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 667 _scopes_pcs_offset = _scopes_data_offset; 668 _dependencies_offset = _scopes_pcs_offset; 669 _handler_table_offset = _dependencies_offset; 670 _nul_chk_table_offset = _handler_table_offset; 671 _nmethod_end_offset = _nul_chk_table_offset; 672 _compile_id = compile_id; 673 _comp_level = CompLevel_none; 674 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 675 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 676 _osr_entry_point = NULL; 677 _exception_cache = NULL; 678 _pc_desc_cache.reset_to(NULL); 679 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 680 681 code_buffer->copy_values_to(this); 682 if (ScavengeRootsInCode) { 683 if (detect_scavenge_root_oops()) { 684 CodeCache::add_scavenge_root_nmethod(this); 685 } 686 Universe::heap()->register_nmethod(this); 687 } 688 debug_only(verify_scavenge_root_oops()); 689 CodeCache::commit(this); 690 } 691 692 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 693 ttyLocker ttyl; // keep the following output all in one block 694 // This output goes directly to the tty, not the compiler log. 695 // To enable tools to match it up with the compilation activity, 696 // be sure to tag this tty output with the compile ID. 697 if (xtty != NULL) { 698 xtty->begin_head("print_native_nmethod"); 699 xtty->method(_method); 700 xtty->stamp(); 701 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 702 } 703 // print the header part first 704 print(); 705 // then print the requested information 706 if (PrintNativeNMethods) { 707 print_code(); 708 if (oop_maps != NULL) { 709 oop_maps->print(); 710 } 711 } 712 if (PrintRelocations) { 713 print_relocations(); 714 } 715 if (xtty != NULL) { 716 xtty->tail("print_native_nmethod"); 717 } 718 } 719 } 720 721 // For dtrace wrappers 722 #ifdef HAVE_DTRACE_H 723 nmethod::nmethod( 724 Method* method, 725 int nmethod_size, 726 CodeOffsets* offsets, 727 CodeBuffer* code_buffer, 728 int frame_size) 729 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 730 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 731 _native_receiver_sp_offset(in_ByteSize(-1)), 732 _native_basic_lock_sp_offset(in_ByteSize(-1)) 733 { 734 { 735 debug_only(No_Safepoint_Verifier nsv;) 736 assert_locked_or_safepoint(CodeCache_lock); 737 738 init_defaults(); 739 _method = method; 740 _entry_bci = InvocationEntryBci; 741 // We have no exception handler or deopt handler make the 742 // values something that will never match a pc like the nmethod vtable entry 743 _exception_offset = 0; 744 _deoptimize_offset = 0; 745 _deoptimize_mh_offset = 0; 746 _unwind_handler_offset = -1; 747 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 748 _orig_pc_offset = 0; 749 _consts_offset = data_offset(); 750 _stub_offset = data_offset(); 751 _oops_offset = data_offset(); 752 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 753 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 754 _scopes_pcs_offset = _scopes_data_offset; 755 _dependencies_offset = _scopes_pcs_offset; 756 _handler_table_offset = _dependencies_offset; 757 _nul_chk_table_offset = _handler_table_offset; 758 _nmethod_end_offset = _nul_chk_table_offset; 759 _compile_id = 0; // default 760 _comp_level = CompLevel_none; 761 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 762 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 763 _osr_entry_point = NULL; 764 _exception_cache = NULL; 765 _pc_desc_cache.reset_to(NULL); 766 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 767 768 code_buffer->copy_values_to(this); 769 if (ScavengeRootsInCode) { 770 if (detect_scavenge_root_oops()) { 771 CodeCache::add_scavenge_root_nmethod(this); 772 } 773 Universe::heap()->register_nmethod(this); 774 } 775 DEBUG_ONLY(verify_scavenge_root_oops();) 776 CodeCache::commit(this); 777 } 778 779 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 780 ttyLocker ttyl; // keep the following output all in one block 781 // This output goes directly to the tty, not the compiler log. 782 // To enable tools to match it up with the compilation activity, 783 // be sure to tag this tty output with the compile ID. 784 if (xtty != NULL) { 785 xtty->begin_head("print_dtrace_nmethod"); 786 xtty->method(_method); 787 xtty->stamp(); 788 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 789 } 790 // print the header part first 791 print(); 792 // then print the requested information 793 if (PrintNMethods) { 794 print_code(); 795 } 796 if (PrintRelocations) { 797 print_relocations(); 798 } 799 if (xtty != NULL) { 800 xtty->tail("print_dtrace_nmethod"); 801 } 802 } 803 } 804 #endif // def HAVE_DTRACE_H 805 806 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 807 // With a SegmentedCodeCache, nmethods are allocated on separate heaps and therefore do not share memory 808 // with critical CodeBlobs. We define the allocation as critical to make sure all code heap memory is used. 809 bool is_critical = SegmentedCodeCache; 810 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level), is_critical); 811 } 812 813 nmethod::nmethod( 814 Method* method, 815 int nmethod_size, 816 int compile_id, 817 int entry_bci, 818 CodeOffsets* offsets, 819 int orig_pc_offset, 820 DebugInformationRecorder* debug_info, 821 Dependencies* dependencies, 822 CodeBuffer *code_buffer, 823 int frame_size, 824 OopMapSet* oop_maps, 825 ExceptionHandlerTable* handler_table, 826 ImplicitExceptionTable* nul_chk_table, 827 AbstractCompiler* compiler, 828 int comp_level 829 ) 830 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 831 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 832 _native_receiver_sp_offset(in_ByteSize(-1)), 833 _native_basic_lock_sp_offset(in_ByteSize(-1)) 834 { 835 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 836 { 837 debug_only(No_Safepoint_Verifier nsv;) 838 assert_locked_or_safepoint(CodeCache_lock); 839 840 init_defaults(); 841 _method = method; 842 _entry_bci = entry_bci; 843 _compile_id = compile_id; 844 _comp_level = comp_level; 845 _compiler = compiler; 846 _orig_pc_offset = orig_pc_offset; 847 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 848 849 // Section offsets 850 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 851 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 852 853 // Exception handler and deopt handler are in the stub section 854 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 855 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 856 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 857 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 858 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 859 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 860 } else { 861 _deoptimize_mh_offset = -1; 862 } 863 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 864 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 865 } else { 866 _unwind_handler_offset = -1; 867 } 868 869 _oops_offset = data_offset(); 870 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 871 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 872 873 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 874 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 875 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 876 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 877 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 878 879 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 880 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 881 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 882 _exception_cache = NULL; 883 _pc_desc_cache.reset_to(scopes_pcs_begin()); 884 885 // Copy contents of ScopeDescRecorder to nmethod 886 code_buffer->copy_values_to(this); 887 debug_info->copy_to(this); 888 dependencies->copy_to(this); 889 if (ScavengeRootsInCode) { 890 if (detect_scavenge_root_oops()) { 891 CodeCache::add_scavenge_root_nmethod(this); 892 } 893 Universe::heap()->register_nmethod(this); 894 } 895 debug_only(verify_scavenge_root_oops()); 896 897 CodeCache::commit(this); 898 899 // Copy contents of ExceptionHandlerTable to nmethod 900 handler_table->copy_to(this); 901 nul_chk_table->copy_to(this); 902 903 // we use the information of entry points to find out if a method is 904 // static or non static 905 assert(compiler->is_c2() || 906 _method->is_static() == (entry_point() == _verified_entry_point), 907 " entry points must be same for static methods and vice versa"); 908 } 909 910 bool printnmethods = PrintNMethods 911 || CompilerOracle::should_print(_method) 912 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 913 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 914 print_nmethod(printnmethods); 915 } 916 } 917 918 919 // Print a short set of xml attributes to identify this nmethod. The 920 // output should be embedded in some other element. 921 void nmethod::log_identity(xmlStream* log) const { 922 log->print(" compile_id='%d'", compile_id()); 923 const char* nm_kind = compile_kind(); 924 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 925 if (compiler() != NULL) { 926 log->print(" compiler='%s'", compiler()->name()); 927 } 928 if (TieredCompilation) { 929 log->print(" level='%d'", comp_level()); 930 } 931 } 932 933 934 #define LOG_OFFSET(log, name) \ 935 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 936 log->print(" " XSTR(name) "_offset='%d'" , \ 937 (intptr_t)name##_begin() - (intptr_t)this) 938 939 940 void nmethod::log_new_nmethod() const { 941 if (LogCompilation && xtty != NULL) { 942 ttyLocker ttyl; 943 HandleMark hm; 944 xtty->begin_elem("nmethod"); 945 log_identity(xtty); 946 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 947 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 948 949 LOG_OFFSET(xtty, relocation); 950 LOG_OFFSET(xtty, consts); 951 LOG_OFFSET(xtty, insts); 952 LOG_OFFSET(xtty, stub); 953 LOG_OFFSET(xtty, scopes_data); 954 LOG_OFFSET(xtty, scopes_pcs); 955 LOG_OFFSET(xtty, dependencies); 956 LOG_OFFSET(xtty, handler_table); 957 LOG_OFFSET(xtty, nul_chk_table); 958 LOG_OFFSET(xtty, oops); 959 960 xtty->method(method()); 961 xtty->stamp(); 962 xtty->end_elem(); 963 } 964 } 965 966 #undef LOG_OFFSET 967 968 969 // Print out more verbose output usually for a newly created nmethod. 970 void nmethod::print_on(outputStream* st, const char* msg) const { 971 if (st != NULL) { 972 ttyLocker ttyl; 973 if (WizardMode) { 974 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); 975 st->print_cr(" (" INTPTR_FORMAT ")", this); 976 } else { 977 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); 978 } 979 } 980 } 981 982 983 void nmethod::print_nmethod(bool printmethod) { 984 ttyLocker ttyl; // keep the following output all in one block 985 if (xtty != NULL) { 986 xtty->begin_head("print_nmethod"); 987 xtty->stamp(); 988 xtty->end_head(); 989 } 990 // print the header part first 991 print(); 992 // then print the requested information 993 if (printmethod) { 994 print_code(); 995 print_pcs(); 996 if (oop_maps()) { 997 oop_maps()->print(); 998 } 999 } 1000 if (PrintDebugInfo) { 1001 print_scopes(); 1002 } 1003 if (PrintRelocations) { 1004 print_relocations(); 1005 } 1006 if (PrintDependencies) { 1007 print_dependencies(); 1008 } 1009 if (PrintExceptionHandlers) { 1010 print_handler_table(); 1011 print_nul_chk_table(); 1012 } 1013 if (xtty != NULL) { 1014 xtty->tail("print_nmethod"); 1015 } 1016 } 1017 1018 1019 // Promote one word from an assembly-time handle to a live embedded oop. 1020 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1021 if (handle == NULL || 1022 // As a special case, IC oops are initialized to 1 or -1. 1023 handle == (jobject) Universe::non_oop_word()) { 1024 (*dest) = (oop) handle; 1025 } else { 1026 (*dest) = JNIHandles::resolve_non_null(handle); 1027 } 1028 } 1029 1030 1031 // Have to have the same name because it's called by a template 1032 void nmethod::copy_values(GrowableArray<jobject>* array) { 1033 int length = array->length(); 1034 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1035 oop* dest = oops_begin(); 1036 for (int index = 0 ; index < length; index++) { 1037 initialize_immediate_oop(&dest[index], array->at(index)); 1038 } 1039 1040 // Now we can fix up all the oops in the code. We need to do this 1041 // in the code because the assembler uses jobjects as placeholders. 1042 // The code and relocations have already been initialized by the 1043 // CodeBlob constructor, so it is valid even at this early point to 1044 // iterate over relocations and patch the code. 1045 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1046 } 1047 1048 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1049 int length = array->length(); 1050 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1051 Metadata** dest = metadata_begin(); 1052 for (int index = 0 ; index < length; index++) { 1053 dest[index] = array->at(index); 1054 } 1055 } 1056 1057 bool nmethod::is_at_poll_return(address pc) { 1058 RelocIterator iter(this, pc, pc+1); 1059 while (iter.next()) { 1060 if (iter.type() == relocInfo::poll_return_type) 1061 return true; 1062 } 1063 return false; 1064 } 1065 1066 1067 bool nmethod::is_at_poll_or_poll_return(address pc) { 1068 RelocIterator iter(this, pc, pc+1); 1069 while (iter.next()) { 1070 relocInfo::relocType t = iter.type(); 1071 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1072 return true; 1073 } 1074 return false; 1075 } 1076 1077 1078 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1079 // re-patch all oop-bearing instructions, just in case some oops moved 1080 RelocIterator iter(this, begin, end); 1081 while (iter.next()) { 1082 if (iter.type() == relocInfo::oop_type) { 1083 oop_Relocation* reloc = iter.oop_reloc(); 1084 if (initialize_immediates && reloc->oop_is_immediate()) { 1085 oop* dest = reloc->oop_addr(); 1086 initialize_immediate_oop(dest, (jobject) *dest); 1087 } 1088 // Refresh the oop-related bits of this instruction. 1089 reloc->fix_oop_relocation(); 1090 } else if (iter.type() == relocInfo::metadata_type) { 1091 metadata_Relocation* reloc = iter.metadata_reloc(); 1092 reloc->fix_metadata_relocation(); 1093 } 1094 } 1095 } 1096 1097 1098 void nmethod::verify_oop_relocations() { 1099 // Ensure sure that the code matches the current oop values 1100 RelocIterator iter(this, NULL, NULL); 1101 while (iter.next()) { 1102 if (iter.type() == relocInfo::oop_type) { 1103 oop_Relocation* reloc = iter.oop_reloc(); 1104 if (!reloc->oop_is_immediate()) { 1105 reloc->verify_oop_relocation(); 1106 } 1107 } 1108 } 1109 } 1110 1111 1112 ScopeDesc* nmethod::scope_desc_at(address pc) { 1113 PcDesc* pd = pc_desc_at(pc); 1114 guarantee(pd != NULL, "scope must be present"); 1115 return new ScopeDesc(this, pd->scope_decode_offset(), 1116 pd->obj_decode_offset(), pd->should_reexecute(), 1117 pd->return_oop()); 1118 } 1119 1120 1121 void nmethod::clear_inline_caches() { 1122 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1123 if (is_zombie()) { 1124 return; 1125 } 1126 1127 RelocIterator iter(this); 1128 while (iter.next()) { 1129 iter.reloc()->clear_inline_cache(); 1130 } 1131 } 1132 1133 1134 void nmethod::cleanup_inline_caches() { 1135 1136 assert_locked_or_safepoint(CompiledIC_lock); 1137 1138 // If the method is not entrant or zombie then a JMP is plastered over the 1139 // first few bytes. If an oop in the old code was there, that oop 1140 // should not get GC'd. Skip the first few bytes of oops on 1141 // not-entrant methods. 1142 address low_boundary = verified_entry_point(); 1143 if (!is_in_use()) { 1144 low_boundary += NativeJump::instruction_size; 1145 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1146 // This means that the low_boundary is going to be a little too high. 1147 // This shouldn't matter, since oops of non-entrant methods are never used. 1148 // In fact, why are we bothering to look at oops in a non-entrant method?? 1149 } 1150 1151 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1152 ResourceMark rm; 1153 RelocIterator iter(this, low_boundary); 1154 while(iter.next()) { 1155 switch(iter.type()) { 1156 case relocInfo::virtual_call_type: 1157 case relocInfo::opt_virtual_call_type: { 1158 CompiledIC *ic = CompiledIC_at(&iter); 1159 // Ok, to lookup references to zombies here 1160 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1161 if( cb != NULL && cb->is_nmethod() ) { 1162 nmethod* nm = (nmethod*)cb; 1163 // Clean inline caches pointing to both zombie and not_entrant methods 1164 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1165 } 1166 break; 1167 } 1168 case relocInfo::static_call_type: { 1169 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1170 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1171 if( cb != NULL && cb->is_nmethod() ) { 1172 nmethod* nm = (nmethod*)cb; 1173 // Clean inline caches pointing to both zombie and not_entrant methods 1174 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1175 } 1176 break; 1177 } 1178 } 1179 } 1180 } 1181 1182 void nmethod::verify_clean_inline_caches() { 1183 assert_locked_or_safepoint(CompiledIC_lock); 1184 1185 // If the method is not entrant or zombie then a JMP is plastered over the 1186 // first few bytes. If an oop in the old code was there, that oop 1187 // should not get GC'd. Skip the first few bytes of oops on 1188 // not-entrant methods. 1189 address low_boundary = verified_entry_point(); 1190 if (!is_in_use()) { 1191 low_boundary += NativeJump::instruction_size; 1192 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1193 // This means that the low_boundary is going to be a little too high. 1194 // This shouldn't matter, since oops of non-entrant methods are never used. 1195 // In fact, why are we bothering to look at oops in a non-entrant method?? 1196 } 1197 1198 ResourceMark rm; 1199 RelocIterator iter(this, low_boundary); 1200 while(iter.next()) { 1201 switch(iter.type()) { 1202 case relocInfo::virtual_call_type: 1203 case relocInfo::opt_virtual_call_type: { 1204 CompiledIC *ic = CompiledIC_at(&iter); 1205 // Ok, to lookup references to zombies here 1206 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1207 if( cb != NULL && cb->is_nmethod() ) { 1208 nmethod* nm = (nmethod*)cb; 1209 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1210 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1211 assert(ic->is_clean(), "IC should be clean"); 1212 } 1213 } 1214 break; 1215 } 1216 case relocInfo::static_call_type: { 1217 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1218 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1219 if( cb != NULL && cb->is_nmethod() ) { 1220 nmethod* nm = (nmethod*)cb; 1221 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1222 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1223 assert(csc->is_clean(), "IC should be clean"); 1224 } 1225 } 1226 break; 1227 } 1228 } 1229 } 1230 } 1231 1232 int nmethod::verify_icholder_relocations() { 1233 int count = 0; 1234 1235 RelocIterator iter(this); 1236 while(iter.next()) { 1237 if (iter.type() == relocInfo::virtual_call_type) { 1238 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1239 CompiledIC *ic = CompiledIC_at(&iter); 1240 if (TraceCompiledIC) { 1241 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1242 ic->print(); 1243 } 1244 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1245 count++; 1246 } 1247 } 1248 } 1249 1250 return count; 1251 } 1252 1253 // This is a private interface with the sweeper. 1254 void nmethod::mark_as_seen_on_stack() { 1255 assert(is_alive(), "Must be an alive method"); 1256 // Set the traversal mark to ensure that the sweeper does 2 1257 // cleaning passes before moving to zombie. 1258 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1259 } 1260 1261 // Tell if a non-entrant method can be converted to a zombie (i.e., 1262 // there are no activations on the stack, not in use by the VM, 1263 // and not in use by the ServiceThread) 1264 bool nmethod::can_not_entrant_be_converted() { 1265 assert(is_not_entrant(), "must be a non-entrant method"); 1266 1267 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1268 // count can be greater than the stack traversal count before it hits the 1269 // nmethod for the second time. 1270 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1271 !is_locked_by_vm(); 1272 } 1273 1274 void nmethod::inc_decompile_count() { 1275 if (!is_compiled_by_c2()) return; 1276 // Could be gated by ProfileTraps, but do not bother... 1277 Method* m = method(); 1278 if (m == NULL) return; 1279 MethodData* mdo = m->method_data(); 1280 if (mdo == NULL) return; 1281 // There is a benign race here. See comments in methodData.hpp. 1282 mdo->inc_decompile_count(); 1283 } 1284 1285 void nmethod::increase_unloading_clock() { 1286 _global_unloading_clock++; 1287 if (_global_unloading_clock == 0) { 1288 // _nmethods are allocated with _unloading_clock == 0, 1289 // so 0 is never used as a clock value. 1290 _global_unloading_clock = 1; 1291 } 1292 } 1293 1294 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1295 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1296 } 1297 1298 unsigned char nmethod::unloading_clock() { 1299 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1300 } 1301 1302 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1303 1304 post_compiled_method_unload(); 1305 1306 // Since this nmethod is being unloaded, make sure that dependencies 1307 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1308 // indicate that this work is being done during a GC. 1309 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1310 assert(is_alive != NULL, "Should be non-NULL"); 1311 // A non-NULL is_alive closure indicates that this is being called during GC. 1312 flush_dependencies(is_alive); 1313 1314 // Break cycle between nmethod & method 1315 if (TraceClassUnloading && WizardMode) { 1316 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1317 " unloadable], Method*(" INTPTR_FORMAT 1318 "), cause(" INTPTR_FORMAT ")", 1319 this, (address)_method, (address)cause); 1320 if (!Universe::heap()->is_gc_active()) 1321 cause->klass()->print(); 1322 } 1323 // Unlink the osr method, so we do not look this up again 1324 if (is_osr_method()) { 1325 invalidate_osr_method(); 1326 } 1327 // If _method is already NULL the Method* is about to be unloaded, 1328 // so we don't have to break the cycle. Note that it is possible to 1329 // have the Method* live here, in case we unload the nmethod because 1330 // it is pointing to some oop (other than the Method*) being unloaded. 1331 if (_method != NULL) { 1332 // OSR methods point to the Method*, but the Method* does not 1333 // point back! 1334 if (_method->code() == this) { 1335 _method->clear_code(); // Break a cycle 1336 } 1337 _method = NULL; // Clear the method of this dead nmethod 1338 } 1339 // Make the class unloaded - i.e., change state and notify sweeper 1340 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1341 if (is_in_use()) { 1342 // Transitioning directly from live to unloaded -- so 1343 // we need to force a cache clean-up; remember this 1344 // for later on. 1345 CodeCache::set_needs_cache_clean(true); 1346 } 1347 1348 // Unregister must be done before the state change 1349 Universe::heap()->unregister_nmethod(this); 1350 1351 _state = unloaded; 1352 1353 // Log the unloading. 1354 log_state_change(); 1355 1356 // The Method* is gone at this point 1357 assert(_method == NULL, "Tautology"); 1358 1359 set_osr_link(NULL); 1360 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1361 NMethodSweeper::report_state_change(this); 1362 } 1363 1364 void nmethod::invalidate_osr_method() { 1365 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1366 // Remove from list of active nmethods 1367 if (method() != NULL) 1368 method()->method_holder()->remove_osr_nmethod(this); 1369 // Set entry as invalid 1370 _entry_bci = InvalidOSREntryBci; 1371 } 1372 1373 void nmethod::log_state_change() const { 1374 if (LogCompilation) { 1375 if (xtty != NULL) { 1376 ttyLocker ttyl; // keep the following output all in one block 1377 if (_state == unloaded) { 1378 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1379 os::current_thread_id()); 1380 } else { 1381 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1382 os::current_thread_id(), 1383 (_state == zombie ? " zombie='1'" : "")); 1384 } 1385 log_identity(xtty); 1386 xtty->stamp(); 1387 xtty->end_elem(); 1388 } 1389 } 1390 if (PrintCompilation && _state != unloaded) { 1391 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1392 } 1393 } 1394 1395 /** 1396 * Common functionality for both make_not_entrant and make_zombie 1397 */ 1398 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1399 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1400 assert(!is_zombie(), "should not already be a zombie"); 1401 1402 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1403 nmethodLocker nml(this); 1404 methodHandle the_method(method()); 1405 No_Safepoint_Verifier nsv; 1406 1407 // during patching, depending on the nmethod state we must notify the GC that 1408 // code has been unloaded, unregistering it. We cannot do this right while 1409 // holding the Patching_lock because we need to use the CodeCache_lock. This 1410 // would be prone to deadlocks. 1411 // This flag is used to remember whether we need to later lock and unregister. 1412 bool nmethod_needs_unregister = false; 1413 1414 { 1415 // invalidate osr nmethod before acquiring the patching lock since 1416 // they both acquire leaf locks and we don't want a deadlock. 1417 // This logic is equivalent to the logic below for patching the 1418 // verified entry point of regular methods. 1419 if (is_osr_method()) { 1420 // this effectively makes the osr nmethod not entrant 1421 invalidate_osr_method(); 1422 } 1423 1424 // Enter critical section. Does not block for safepoint. 1425 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1426 1427 if (_state == state) { 1428 // another thread already performed this transition so nothing 1429 // to do, but return false to indicate this. 1430 return false; 1431 } 1432 1433 // The caller can be calling the method statically or through an inline 1434 // cache call. 1435 if (!is_osr_method() && !is_not_entrant()) { 1436 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1437 SharedRuntime::get_handle_wrong_method_stub()); 1438 } 1439 1440 if (is_in_use()) { 1441 // It's a true state change, so mark the method as decompiled. 1442 // Do it only for transition from alive. 1443 inc_decompile_count(); 1444 } 1445 1446 // If the state is becoming a zombie, signal to unregister the nmethod with 1447 // the heap. 1448 // This nmethod may have already been unloaded during a full GC. 1449 if ((state == zombie) && !is_unloaded()) { 1450 nmethod_needs_unregister = true; 1451 } 1452 1453 // Must happen before state change. Otherwise we have a race condition in 1454 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1455 // transition its state from 'not_entrant' to 'zombie' without having to wait 1456 // for stack scanning. 1457 if (state == not_entrant) { 1458 mark_as_seen_on_stack(); 1459 OrderAccess::storestore(); 1460 } 1461 1462 // Change state 1463 _state = state; 1464 1465 // Log the transition once 1466 log_state_change(); 1467 1468 // Remove nmethod from method. 1469 // We need to check if both the _code and _from_compiled_code_entry_point 1470 // refer to this nmethod because there is a race in setting these two fields 1471 // in Method* as seen in bugid 4947125. 1472 // If the vep() points to the zombie nmethod, the memory for the nmethod 1473 // could be flushed and the compiler and vtable stubs could still call 1474 // through it. 1475 if (method() != NULL && (method()->code() == this || 1476 method()->from_compiled_entry() == verified_entry_point())) { 1477 HandleMark hm; 1478 method()->clear_code(); 1479 } 1480 } // leave critical region under Patching_lock 1481 1482 // When the nmethod becomes zombie it is no longer alive so the 1483 // dependencies must be flushed. nmethods in the not_entrant 1484 // state will be flushed later when the transition to zombie 1485 // happens or they get unloaded. 1486 if (state == zombie) { 1487 { 1488 // Flushing dependecies must be done before any possible 1489 // safepoint can sneak in, otherwise the oops used by the 1490 // dependency logic could have become stale. 1491 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1492 if (nmethod_needs_unregister) { 1493 Universe::heap()->unregister_nmethod(this); 1494 } 1495 flush_dependencies(NULL); 1496 } 1497 1498 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1499 // event and it hasn't already been reported for this nmethod then 1500 // report it now. The event may have been reported earilier if the GC 1501 // marked it for unloading). JvmtiDeferredEventQueue support means 1502 // we no longer go to a safepoint here. 1503 post_compiled_method_unload(); 1504 1505 #ifdef ASSERT 1506 // It's no longer safe to access the oops section since zombie 1507 // nmethods aren't scanned for GC. 1508 _oops_are_stale = true; 1509 #endif 1510 // the Method may be reclaimed by class unloading now that the 1511 // nmethod is in zombie state 1512 set_method(NULL); 1513 } else { 1514 assert(state == not_entrant, "other cases may need to be handled differently"); 1515 } 1516 1517 if (TraceCreateZombies) { 1518 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1519 } 1520 1521 NMethodSweeper::report_state_change(this); 1522 return true; 1523 } 1524 1525 void nmethod::flush() { 1526 // Note that there are no valid oops in the nmethod anymore. 1527 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1528 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1529 1530 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1531 assert_locked_or_safepoint(CodeCache_lock); 1532 1533 // completely deallocate this method 1534 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1535 if (PrintMethodFlushing) { 1536 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1537 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(_comp_level))/1024); 1538 } 1539 1540 // We need to deallocate any ExceptionCache data. 1541 // Note that we do not need to grab the nmethod lock for this, it 1542 // better be thread safe if we're disposing of it! 1543 ExceptionCache* ec = exception_cache(); 1544 set_exception_cache(NULL); 1545 while(ec != NULL) { 1546 ExceptionCache* next = ec->next(); 1547 delete ec; 1548 ec = next; 1549 } 1550 1551 if (on_scavenge_root_list()) { 1552 CodeCache::drop_scavenge_root_nmethod(this); 1553 } 1554 1555 #ifdef SHARK 1556 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1557 #endif // SHARK 1558 1559 ((CodeBlob*)(this))->flush(); 1560 1561 CodeCache::free(this); 1562 } 1563 1564 // 1565 // Notify all classes this nmethod is dependent on that it is no 1566 // longer dependent. This should only be called in two situations. 1567 // First, when a nmethod transitions to a zombie all dependents need 1568 // to be clear. Since zombification happens at a safepoint there's no 1569 // synchronization issues. The second place is a little more tricky. 1570 // During phase 1 of mark sweep class unloading may happen and as a 1571 // result some nmethods may get unloaded. In this case the flushing 1572 // of dependencies must happen during phase 1 since after GC any 1573 // dependencies in the unloaded nmethod won't be updated, so 1574 // traversing the dependency information in unsafe. In that case this 1575 // function is called with a non-NULL argument and this function only 1576 // notifies instanceKlasses that are reachable 1577 1578 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1579 assert_locked_or_safepoint(CodeCache_lock); 1580 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1581 "is_alive is non-NULL if and only if we are called during GC"); 1582 if (!has_flushed_dependencies()) { 1583 set_has_flushed_dependencies(); 1584 for (Dependencies::DepStream deps(this); deps.next(); ) { 1585 Klass* klass = deps.context_type(); 1586 if (klass == NULL) continue; // ignore things like evol_method 1587 1588 // During GC the is_alive closure is non-NULL, and is used to 1589 // determine liveness of dependees that need to be updated. 1590 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1591 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1592 } 1593 } 1594 } 1595 } 1596 1597 1598 // If this oop is not live, the nmethod can be unloaded. 1599 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1600 assert(root != NULL, "just checking"); 1601 oop obj = *root; 1602 if (obj == NULL || is_alive->do_object_b(obj)) { 1603 return false; 1604 } 1605 1606 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1607 // simply because one of its constant oops has gone dead. 1608 // No actual classes need to be unloaded in order for this to occur. 1609 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1610 make_unloaded(is_alive, obj); 1611 return true; 1612 } 1613 1614 // ------------------------------------------------------------------ 1615 // post_compiled_method_load_event 1616 // new method for install_code() path 1617 // Transfer information from compilation to jvmti 1618 void nmethod::post_compiled_method_load_event() { 1619 1620 Method* moop = method(); 1621 HOTSPOT_COMPILED_METHOD_LOAD( 1622 (char *) moop->klass_name()->bytes(), 1623 moop->klass_name()->utf8_length(), 1624 (char *) moop->name()->bytes(), 1625 moop->name()->utf8_length(), 1626 (char *) moop->signature()->bytes(), 1627 moop->signature()->utf8_length(), 1628 insts_begin(), insts_size()); 1629 1630 if (JvmtiExport::should_post_compiled_method_load() || 1631 JvmtiExport::should_post_compiled_method_unload()) { 1632 get_and_cache_jmethod_id(); 1633 } 1634 1635 if (JvmtiExport::should_post_compiled_method_load()) { 1636 // Let the Service thread (which is a real Java thread) post the event 1637 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1638 JvmtiDeferredEventQueue::enqueue( 1639 JvmtiDeferredEvent::compiled_method_load_event(this)); 1640 } 1641 } 1642 1643 jmethodID nmethod::get_and_cache_jmethod_id() { 1644 if (_jmethod_id == NULL) { 1645 // Cache the jmethod_id since it can no longer be looked up once the 1646 // method itself has been marked for unloading. 1647 _jmethod_id = method()->jmethod_id(); 1648 } 1649 return _jmethod_id; 1650 } 1651 1652 void nmethod::post_compiled_method_unload() { 1653 if (unload_reported()) { 1654 // During unloading we transition to unloaded and then to zombie 1655 // and the unloading is reported during the first transition. 1656 return; 1657 } 1658 1659 assert(_method != NULL && !is_unloaded(), "just checking"); 1660 DTRACE_METHOD_UNLOAD_PROBE(method()); 1661 1662 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1663 // post the event. Sometime later this nmethod will be made a zombie 1664 // by the sweeper but the Method* will not be valid at that point. 1665 // If the _jmethod_id is null then no load event was ever requested 1666 // so don't bother posting the unload. The main reason for this is 1667 // that the jmethodID is a weak reference to the Method* so if 1668 // it's being unloaded there's no way to look it up since the weak 1669 // ref will have been cleared. 1670 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1671 assert(!unload_reported(), "already unloaded"); 1672 JvmtiDeferredEvent event = 1673 JvmtiDeferredEvent::compiled_method_unload_event(this, 1674 _jmethod_id, insts_begin()); 1675 if (SafepointSynchronize::is_at_safepoint()) { 1676 // Don't want to take the queueing lock. Add it as pending and 1677 // it will get enqueued later. 1678 JvmtiDeferredEventQueue::add_pending_event(event); 1679 } else { 1680 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1681 JvmtiDeferredEventQueue::enqueue(event); 1682 } 1683 } 1684 1685 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1686 // any time. As the nmethod is being unloaded now we mark it has 1687 // having the unload event reported - this will ensure that we don't 1688 // attempt to report the event in the unlikely scenario where the 1689 // event is enabled at the time the nmethod is made a zombie. 1690 set_unload_reported(); 1691 } 1692 1693 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1694 if (ic->is_icholder_call()) { 1695 // The only exception is compiledICHolder oops which may 1696 // yet be marked below. (We check this further below). 1697 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1698 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1699 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1700 return; 1701 } 1702 } else { 1703 Metadata* ic_oop = ic->cached_metadata(); 1704 if (ic_oop != NULL) { 1705 if (ic_oop->is_klass()) { 1706 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1707 return; 1708 } 1709 } else if (ic_oop->is_method()) { 1710 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1711 return; 1712 } 1713 } else { 1714 ShouldNotReachHere(); 1715 } 1716 } 1717 } 1718 1719 ic->set_to_clean(); 1720 } 1721 1722 // This is called at the end of the strong tracing/marking phase of a 1723 // GC to unload an nmethod if it contains otherwise unreachable 1724 // oops. 1725 1726 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1727 // Make sure the oop's ready to receive visitors 1728 assert(!is_zombie() && !is_unloaded(), 1729 "should not call follow on zombie or unloaded nmethod"); 1730 1731 // If the method is not entrant then a JMP is plastered over the 1732 // first few bytes. If an oop in the old code was there, that oop 1733 // should not get GC'd. Skip the first few bytes of oops on 1734 // not-entrant methods. 1735 address low_boundary = verified_entry_point(); 1736 if (is_not_entrant()) { 1737 low_boundary += NativeJump::instruction_size; 1738 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1739 // (See comment above.) 1740 } 1741 1742 // The RedefineClasses() API can cause the class unloading invariant 1743 // to no longer be true. See jvmtiExport.hpp for details. 1744 // Also, leave a debugging breadcrumb in local flag. 1745 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1746 if (a_class_was_redefined) { 1747 // This set of the unloading_occurred flag is done before the 1748 // call to post_compiled_method_unload() so that the unloading 1749 // of this nmethod is reported. 1750 unloading_occurred = true; 1751 } 1752 1753 // Exception cache 1754 clean_exception_cache(is_alive); 1755 1756 // If class unloading occurred we first iterate over all inline caches and 1757 // clear ICs where the cached oop is referring to an unloaded klass or method. 1758 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1759 // iteration below. 1760 if (unloading_occurred) { 1761 RelocIterator iter(this, low_boundary); 1762 while(iter.next()) { 1763 if (iter.type() == relocInfo::virtual_call_type) { 1764 CompiledIC *ic = CompiledIC_at(&iter); 1765 clean_ic_if_metadata_is_dead(ic, is_alive); 1766 } 1767 } 1768 } 1769 1770 // Compiled code 1771 { 1772 RelocIterator iter(this, low_boundary); 1773 while (iter.next()) { 1774 if (iter.type() == relocInfo::oop_type) { 1775 oop_Relocation* r = iter.oop_reloc(); 1776 // In this loop, we must only traverse those oops directly embedded in 1777 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1778 assert(1 == (r->oop_is_immediate()) + 1779 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1780 "oop must be found in exactly one place"); 1781 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1782 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1783 return; 1784 } 1785 } 1786 } 1787 } 1788 } 1789 1790 1791 // Scopes 1792 for (oop* p = oops_begin(); p < oops_end(); p++) { 1793 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1794 if (can_unload(is_alive, p, unloading_occurred)) { 1795 return; 1796 } 1797 } 1798 1799 // Ensure that all metadata is still alive 1800 verify_metadata_loaders(low_boundary, is_alive); 1801 } 1802 1803 template <class CompiledICorStaticCall> 1804 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1805 // Ok, to lookup references to zombies here 1806 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1807 if (cb != NULL && cb->is_nmethod()) { 1808 nmethod* nm = (nmethod*)cb; 1809 1810 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1811 // The nmethod has not been processed yet. 1812 return true; 1813 } 1814 1815 // Clean inline caches pointing to both zombie and not_entrant methods 1816 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1817 ic->set_to_clean(); 1818 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1819 } 1820 } 1821 1822 return false; 1823 } 1824 1825 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1826 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1827 } 1828 1829 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1830 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1831 } 1832 1833 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1834 ResourceMark rm; 1835 1836 // Make sure the oop's ready to receive visitors 1837 assert(!is_zombie() && !is_unloaded(), 1838 "should not call follow on zombie or unloaded nmethod"); 1839 1840 // If the method is not entrant then a JMP is plastered over the 1841 // first few bytes. If an oop in the old code was there, that oop 1842 // should not get GC'd. Skip the first few bytes of oops on 1843 // not-entrant methods. 1844 address low_boundary = verified_entry_point(); 1845 if (is_not_entrant()) { 1846 low_boundary += NativeJump::instruction_size; 1847 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1848 // (See comment above.) 1849 } 1850 1851 // The RedefineClasses() API can cause the class unloading invariant 1852 // to no longer be true. See jvmtiExport.hpp for details. 1853 // Also, leave a debugging breadcrumb in local flag. 1854 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1855 if (a_class_was_redefined) { 1856 // This set of the unloading_occurred flag is done before the 1857 // call to post_compiled_method_unload() so that the unloading 1858 // of this nmethod is reported. 1859 unloading_occurred = true; 1860 } 1861 1862 // Exception cache 1863 clean_exception_cache(is_alive); 1864 1865 bool is_unloaded = false; 1866 bool postponed = false; 1867 1868 RelocIterator iter(this, low_boundary); 1869 while(iter.next()) { 1870 1871 switch (iter.type()) { 1872 1873 case relocInfo::virtual_call_type: 1874 if (unloading_occurred) { 1875 // If class unloading occurred we first iterate over all inline caches and 1876 // clear ICs where the cached oop is referring to an unloaded klass or method. 1877 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1878 } 1879 1880 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1881 break; 1882 1883 case relocInfo::opt_virtual_call_type: 1884 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1885 break; 1886 1887 case relocInfo::static_call_type: 1888 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1889 break; 1890 1891 case relocInfo::oop_type: 1892 if (!is_unloaded) { 1893 // Unload check 1894 oop_Relocation* r = iter.oop_reloc(); 1895 // Traverse those oops directly embedded in the code. 1896 // Other oops (oop_index>0) are seen as part of scopes_oops. 1897 assert(1 == (r->oop_is_immediate()) + 1898 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1899 "oop must be found in exactly one place"); 1900 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1901 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1902 is_unloaded = true; 1903 } 1904 } 1905 } 1906 break; 1907 1908 } 1909 } 1910 1911 if (is_unloaded) { 1912 return postponed; 1913 } 1914 1915 // Scopes 1916 for (oop* p = oops_begin(); p < oops_end(); p++) { 1917 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1918 if (can_unload(is_alive, p, unloading_occurred)) { 1919 is_unloaded = true; 1920 break; 1921 } 1922 } 1923 1924 if (is_unloaded) { 1925 return postponed; 1926 } 1927 1928 // Ensure that all metadata is still alive 1929 verify_metadata_loaders(low_boundary, is_alive); 1930 1931 return postponed; 1932 } 1933 1934 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 1935 ResourceMark rm; 1936 1937 // Make sure the oop's ready to receive visitors 1938 assert(!is_zombie(), 1939 "should not call follow on zombie nmethod"); 1940 1941 // If the method is not entrant then a JMP is plastered over the 1942 // first few bytes. If an oop in the old code was there, that oop 1943 // should not get GC'd. Skip the first few bytes of oops on 1944 // not-entrant methods. 1945 address low_boundary = verified_entry_point(); 1946 if (is_not_entrant()) { 1947 low_boundary += NativeJump::instruction_size; 1948 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1949 // (See comment above.) 1950 } 1951 1952 RelocIterator iter(this, low_boundary); 1953 while(iter.next()) { 1954 1955 switch (iter.type()) { 1956 1957 case relocInfo::virtual_call_type: 1958 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1959 break; 1960 1961 case relocInfo::opt_virtual_call_type: 1962 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1963 break; 1964 1965 case relocInfo::static_call_type: 1966 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1967 break; 1968 } 1969 } 1970 } 1971 1972 #ifdef ASSERT 1973 1974 class CheckClass : AllStatic { 1975 static BoolObjectClosure* _is_alive; 1976 1977 // Check class_loader is alive for this bit of metadata. 1978 static void check_class(Metadata* md) { 1979 Klass* klass = NULL; 1980 if (md->is_klass()) { 1981 klass = ((Klass*)md); 1982 } else if (md->is_method()) { 1983 klass = ((Method*)md)->method_holder(); 1984 } else if (md->is_methodData()) { 1985 klass = ((MethodData*)md)->method()->method_holder(); 1986 } else { 1987 md->print(); 1988 ShouldNotReachHere(); 1989 } 1990 assert(klass->is_loader_alive(_is_alive), "must be alive"); 1991 } 1992 public: 1993 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 1994 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 1995 _is_alive = is_alive; 1996 nm->metadata_do(check_class); 1997 } 1998 }; 1999 2000 // This is called during a safepoint so can use static data 2001 BoolObjectClosure* CheckClass::_is_alive = NULL; 2002 #endif // ASSERT 2003 2004 2005 // Processing of oop references should have been sufficient to keep 2006 // all strong references alive. Any weak references should have been 2007 // cleared as well. Visit all the metadata and ensure that it's 2008 // really alive. 2009 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2010 #ifdef ASSERT 2011 RelocIterator iter(this, low_boundary); 2012 while (iter.next()) { 2013 // static_stub_Relocations may have dangling references to 2014 // Method*s so trim them out here. Otherwise it looks like 2015 // compiled code is maintaining a link to dead metadata. 2016 address static_call_addr = NULL; 2017 if (iter.type() == relocInfo::opt_virtual_call_type) { 2018 CompiledIC* cic = CompiledIC_at(&iter); 2019 if (!cic->is_call_to_interpreted()) { 2020 static_call_addr = iter.addr(); 2021 } 2022 } else if (iter.type() == relocInfo::static_call_type) { 2023 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2024 if (!csc->is_call_to_interpreted()) { 2025 static_call_addr = iter.addr(); 2026 } 2027 } 2028 if (static_call_addr != NULL) { 2029 RelocIterator sciter(this, low_boundary); 2030 while (sciter.next()) { 2031 if (sciter.type() == relocInfo::static_stub_type && 2032 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2033 sciter.static_stub_reloc()->clear_inline_cache(); 2034 } 2035 } 2036 } 2037 } 2038 // Check that the metadata embedded in the nmethod is alive 2039 CheckClass::do_check_class(is_alive, this); 2040 #endif 2041 } 2042 2043 2044 // Iterate over metadata calling this function. Used by RedefineClasses 2045 void nmethod::metadata_do(void f(Metadata*)) { 2046 address low_boundary = verified_entry_point(); 2047 if (is_not_entrant()) { 2048 low_boundary += NativeJump::instruction_size; 2049 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2050 // (See comment above.) 2051 } 2052 { 2053 // Visit all immediate references that are embedded in the instruction stream. 2054 RelocIterator iter(this, low_boundary); 2055 while (iter.next()) { 2056 if (iter.type() == relocInfo::metadata_type ) { 2057 metadata_Relocation* r = iter.metadata_reloc(); 2058 // In this lmetadata, we must only follow those metadatas directly embedded in 2059 // the code. Other metadatas (oop_index>0) are seen as part of 2060 // the metadata section below. 2061 assert(1 == (r->metadata_is_immediate()) + 2062 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2063 "metadata must be found in exactly one place"); 2064 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2065 Metadata* md = r->metadata_value(); 2066 f(md); 2067 } 2068 } else if (iter.type() == relocInfo::virtual_call_type) { 2069 // Check compiledIC holders associated with this nmethod 2070 CompiledIC *ic = CompiledIC_at(&iter); 2071 if (ic->is_icholder_call()) { 2072 CompiledICHolder* cichk = ic->cached_icholder(); 2073 f(cichk->holder_method()); 2074 f(cichk->holder_klass()); 2075 } else { 2076 Metadata* ic_oop = ic->cached_metadata(); 2077 if (ic_oop != NULL) { 2078 f(ic_oop); 2079 } 2080 } 2081 } 2082 } 2083 } 2084 2085 // Visit the metadata section 2086 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2087 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2088 Metadata* md = *p; 2089 f(md); 2090 } 2091 2092 // Call function Method*, not embedded in these other places. 2093 if (_method != NULL) f(_method); 2094 } 2095 2096 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2097 // make sure the oops ready to receive visitors 2098 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2099 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2100 2101 // If the method is not entrant or zombie then a JMP is plastered over the 2102 // first few bytes. If an oop in the old code was there, that oop 2103 // should not get GC'd. Skip the first few bytes of oops on 2104 // not-entrant methods. 2105 address low_boundary = verified_entry_point(); 2106 if (is_not_entrant()) { 2107 low_boundary += NativeJump::instruction_size; 2108 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2109 // (See comment above.) 2110 } 2111 2112 RelocIterator iter(this, low_boundary); 2113 2114 while (iter.next()) { 2115 if (iter.type() == relocInfo::oop_type ) { 2116 oop_Relocation* r = iter.oop_reloc(); 2117 // In this loop, we must only follow those oops directly embedded in 2118 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2119 assert(1 == (r->oop_is_immediate()) + 2120 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2121 "oop must be found in exactly one place"); 2122 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2123 f->do_oop(r->oop_addr()); 2124 } 2125 } 2126 } 2127 2128 // Scopes 2129 // This includes oop constants not inlined in the code stream. 2130 for (oop* p = oops_begin(); p < oops_end(); p++) { 2131 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2132 f->do_oop(p); 2133 } 2134 } 2135 2136 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2137 2138 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2139 2140 // An nmethod is "marked" if its _mark_link is set non-null. 2141 // Even if it is the end of the linked list, it will have a non-null link value, 2142 // as long as it is on the list. 2143 // This code must be MP safe, because it is used from parallel GC passes. 2144 bool nmethod::test_set_oops_do_mark() { 2145 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2146 nmethod* observed_mark_link = _oops_do_mark_link; 2147 if (observed_mark_link == NULL) { 2148 // Claim this nmethod for this thread to mark. 2149 observed_mark_link = (nmethod*) 2150 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2151 if (observed_mark_link == NULL) { 2152 2153 // Atomically append this nmethod (now claimed) to the head of the list: 2154 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2155 for (;;) { 2156 nmethod* required_mark_nmethods = observed_mark_nmethods; 2157 _oops_do_mark_link = required_mark_nmethods; 2158 observed_mark_nmethods = (nmethod*) 2159 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2160 if (observed_mark_nmethods == required_mark_nmethods) 2161 break; 2162 } 2163 // Mark was clear when we first saw this guy. 2164 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2165 return false; 2166 } 2167 } 2168 // On fall through, another racing thread marked this nmethod before we did. 2169 return true; 2170 } 2171 2172 void nmethod::oops_do_marking_prologue() { 2173 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2174 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2175 // We use cmpxchg_ptr instead of regular assignment here because the user 2176 // may fork a bunch of threads, and we need them all to see the same state. 2177 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2178 guarantee(observed == NULL, "no races in this sequential code"); 2179 } 2180 2181 void nmethod::oops_do_marking_epilogue() { 2182 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2183 nmethod* cur = _oops_do_mark_nmethods; 2184 while (cur != NMETHOD_SENTINEL) { 2185 assert(cur != NULL, "not NULL-terminated"); 2186 nmethod* next = cur->_oops_do_mark_link; 2187 cur->_oops_do_mark_link = NULL; 2188 cur->verify_oop_relocations(); 2189 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2190 cur = next; 2191 } 2192 void* required = _oops_do_mark_nmethods; 2193 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2194 guarantee(observed == required, "no races in this sequential code"); 2195 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2196 } 2197 2198 class DetectScavengeRoot: public OopClosure { 2199 bool _detected_scavenge_root; 2200 public: 2201 DetectScavengeRoot() : _detected_scavenge_root(false) 2202 { NOT_PRODUCT(_print_nm = NULL); } 2203 bool detected_scavenge_root() { return _detected_scavenge_root; } 2204 virtual void do_oop(oop* p) { 2205 if ((*p) != NULL && (*p)->is_scavengable()) { 2206 NOT_PRODUCT(maybe_print(p)); 2207 _detected_scavenge_root = true; 2208 } 2209 } 2210 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2211 2212 #ifndef PRODUCT 2213 nmethod* _print_nm; 2214 void maybe_print(oop* p) { 2215 if (_print_nm == NULL) return; 2216 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2217 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 2218 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2219 (void *)(*p), (intptr_t)p); 2220 (*p)->print(); 2221 } 2222 #endif //PRODUCT 2223 }; 2224 2225 bool nmethod::detect_scavenge_root_oops() { 2226 DetectScavengeRoot detect_scavenge_root; 2227 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2228 oops_do(&detect_scavenge_root); 2229 return detect_scavenge_root.detected_scavenge_root(); 2230 } 2231 2232 // Method that knows how to preserve outgoing arguments at call. This method must be 2233 // called with a frame corresponding to a Java invoke 2234 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2235 #ifndef SHARK 2236 if (!method()->is_native()) { 2237 SimpleScopeDesc ssd(this, fr.pc()); 2238 Bytecode_invoke call(ssd.method(), ssd.bci()); 2239 bool has_receiver = call.has_receiver(); 2240 bool has_appendix = call.has_appendix(); 2241 Symbol* signature = call.signature(); 2242 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2243 } 2244 #endif // !SHARK 2245 } 2246 2247 2248 oop nmethod::embeddedOop_at(u_char* p) { 2249 RelocIterator iter(this, p, p + 1); 2250 while (iter.next()) 2251 if (iter.type() == relocInfo::oop_type) { 2252 return iter.oop_reloc()->oop_value(); 2253 } 2254 return NULL; 2255 } 2256 2257 2258 inline bool includes(void* p, void* from, void* to) { 2259 return from <= p && p < to; 2260 } 2261 2262 2263 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2264 assert(count >= 2, "must be sentinel values, at least"); 2265 2266 #ifdef ASSERT 2267 // must be sorted and unique; we do a binary search in find_pc_desc() 2268 int prev_offset = pcs[0].pc_offset(); 2269 assert(prev_offset == PcDesc::lower_offset_limit, 2270 "must start with a sentinel"); 2271 for (int i = 1; i < count; i++) { 2272 int this_offset = pcs[i].pc_offset(); 2273 assert(this_offset > prev_offset, "offsets must be sorted"); 2274 prev_offset = this_offset; 2275 } 2276 assert(prev_offset == PcDesc::upper_offset_limit, 2277 "must end with a sentinel"); 2278 #endif //ASSERT 2279 2280 // Search for MethodHandle invokes and tag the nmethod. 2281 for (int i = 0; i < count; i++) { 2282 if (pcs[i].is_method_handle_invoke()) { 2283 set_has_method_handle_invokes(true); 2284 break; 2285 } 2286 } 2287 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2288 2289 int size = count * sizeof(PcDesc); 2290 assert(scopes_pcs_size() >= size, "oob"); 2291 memcpy(scopes_pcs_begin(), pcs, size); 2292 2293 // Adjust the final sentinel downward. 2294 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2295 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2296 last_pc->set_pc_offset(content_size() + 1); 2297 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2298 // Fill any rounding gaps with copies of the last record. 2299 last_pc[1] = last_pc[0]; 2300 } 2301 // The following assert could fail if sizeof(PcDesc) is not 2302 // an integral multiple of oopSize (the rounding term). 2303 // If it fails, change the logic to always allocate a multiple 2304 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2305 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2306 } 2307 2308 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2309 assert(scopes_data_size() >= size, "oob"); 2310 memcpy(scopes_data_begin(), buffer, size); 2311 } 2312 2313 2314 #ifdef ASSERT 2315 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2316 PcDesc* lower = nm->scopes_pcs_begin(); 2317 PcDesc* upper = nm->scopes_pcs_end(); 2318 lower += 1; // exclude initial sentinel 2319 PcDesc* res = NULL; 2320 for (PcDesc* p = lower; p < upper; p++) { 2321 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2322 if (match_desc(p, pc_offset, approximate)) { 2323 if (res == NULL) 2324 res = p; 2325 else 2326 res = (PcDesc*) badAddress; 2327 } 2328 } 2329 return res; 2330 } 2331 #endif 2332 2333 2334 // Finds a PcDesc with real-pc equal to "pc" 2335 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2336 address base_address = code_begin(); 2337 if ((pc < base_address) || 2338 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2339 return NULL; // PC is wildly out of range 2340 } 2341 int pc_offset = (int) (pc - base_address); 2342 2343 // Check the PcDesc cache if it contains the desired PcDesc 2344 // (This as an almost 100% hit rate.) 2345 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2346 if (res != NULL) { 2347 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2348 return res; 2349 } 2350 2351 // Fallback algorithm: quasi-linear search for the PcDesc 2352 // Find the last pc_offset less than the given offset. 2353 // The successor must be the required match, if there is a match at all. 2354 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2355 PcDesc* lower = scopes_pcs_begin(); 2356 PcDesc* upper = scopes_pcs_end(); 2357 upper -= 1; // exclude final sentinel 2358 if (lower >= upper) return NULL; // native method; no PcDescs at all 2359 2360 #define assert_LU_OK \ 2361 /* invariant on lower..upper during the following search: */ \ 2362 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2363 assert(upper->pc_offset() >= pc_offset, "sanity") 2364 assert_LU_OK; 2365 2366 // Use the last successful return as a split point. 2367 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2368 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2369 if (mid->pc_offset() < pc_offset) { 2370 lower = mid; 2371 } else { 2372 upper = mid; 2373 } 2374 2375 // Take giant steps at first (4096, then 256, then 16, then 1) 2376 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2377 const int RADIX = (1 << LOG2_RADIX); 2378 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2379 while ((mid = lower + step) < upper) { 2380 assert_LU_OK; 2381 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2382 if (mid->pc_offset() < pc_offset) { 2383 lower = mid; 2384 } else { 2385 upper = mid; 2386 break; 2387 } 2388 } 2389 assert_LU_OK; 2390 } 2391 2392 // Sneak up on the value with a linear search of length ~16. 2393 while (true) { 2394 assert_LU_OK; 2395 mid = lower + 1; 2396 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2397 if (mid->pc_offset() < pc_offset) { 2398 lower = mid; 2399 } else { 2400 upper = mid; 2401 break; 2402 } 2403 } 2404 #undef assert_LU_OK 2405 2406 if (match_desc(upper, pc_offset, approximate)) { 2407 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2408 _pc_desc_cache.add_pc_desc(upper); 2409 return upper; 2410 } else { 2411 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2412 return NULL; 2413 } 2414 } 2415 2416 2417 void nmethod::check_all_dependencies(DepChange& changes) { 2418 // Checked dependencies are allocated into this ResourceMark 2419 ResourceMark rm; 2420 2421 // Turn off dependency tracing while actually testing dependencies. 2422 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2423 2424 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2425 &DependencySignature::equals, 11027> DepTable; 2426 2427 DepTable* table = new DepTable(); 2428 2429 // Iterate over live nmethods and check dependencies of all nmethods that are not 2430 // marked for deoptimization. A particular dependency is only checked once. 2431 NMethodIterator iter; 2432 while(iter.next()) { 2433 nmethod* nm = iter.method(); 2434 // Only notify for live nmethods 2435 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2436 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2437 // Construct abstraction of a dependency. 2438 DependencySignature* current_sig = new DependencySignature(deps); 2439 2440 // Determine if dependency is already checked. table->put(...) returns 2441 // 'true' if the dependency is added (i.e., was not in the hashtable). 2442 if (table->put(*current_sig, 1)) { 2443 if (deps.check_dependency() != NULL) { 2444 // Dependency checking failed. Print out information about the failed 2445 // dependency and finally fail with an assert. We can fail here, since 2446 // dependency checking is never done in a product build. 2447 changes.print(); 2448 nm->print(); 2449 nm->print_dependencies(); 2450 assert(false, "Should have been marked for deoptimization"); 2451 } 2452 } 2453 } 2454 } 2455 } 2456 } 2457 2458 bool nmethod::check_dependency_on(DepChange& changes) { 2459 // What has happened: 2460 // 1) a new class dependee has been added 2461 // 2) dependee and all its super classes have been marked 2462 bool found_check = false; // set true if we are upset 2463 for (Dependencies::DepStream deps(this); deps.next(); ) { 2464 // Evaluate only relevant dependencies. 2465 if (deps.spot_check_dependency_at(changes) != NULL) { 2466 found_check = true; 2467 NOT_DEBUG(break); 2468 } 2469 } 2470 return found_check; 2471 } 2472 2473 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2474 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2475 Array<Method*>* dependee_methods = dependee_ik->methods(); 2476 for (Dependencies::DepStream deps(this); deps.next(); ) { 2477 if (deps.type() == Dependencies::evol_method) { 2478 Method* method = deps.method_argument(0); 2479 for (int j = 0; j < dependee_methods->length(); j++) { 2480 if (dependee_methods->at(j) == method) { 2481 // RC_TRACE macro has an embedded ResourceMark 2482 RC_TRACE(0x01000000, 2483 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2484 _method->method_holder()->external_name(), 2485 _method->name()->as_C_string(), 2486 _method->signature()->as_C_string(), compile_id(), 2487 method->method_holder()->external_name(), 2488 method->name()->as_C_string(), 2489 method->signature()->as_C_string())); 2490 if (TraceDependencies || LogCompilation) 2491 deps.log_dependency(dependee); 2492 return true; 2493 } 2494 } 2495 } 2496 } 2497 return false; 2498 } 2499 2500 // Called from mark_for_deoptimization, when dependee is invalidated. 2501 bool nmethod::is_dependent_on_method(Method* dependee) { 2502 for (Dependencies::DepStream deps(this); deps.next(); ) { 2503 if (deps.type() != Dependencies::evol_method) 2504 continue; 2505 Method* method = deps.method_argument(0); 2506 if (method == dependee) return true; 2507 } 2508 return false; 2509 } 2510 2511 2512 bool nmethod::is_patchable_at(address instr_addr) { 2513 assert(insts_contains(instr_addr), "wrong nmethod used"); 2514 if (is_zombie()) { 2515 // a zombie may never be patched 2516 return false; 2517 } 2518 return true; 2519 } 2520 2521 2522 address nmethod::continuation_for_implicit_exception(address pc) { 2523 // Exception happened outside inline-cache check code => we are inside 2524 // an active nmethod => use cpc to determine a return address 2525 int exception_offset = pc - code_begin(); 2526 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2527 #ifdef ASSERT 2528 if (cont_offset == 0) { 2529 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2530 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2531 HandleMark hm(thread); 2532 ResourceMark rm(thread); 2533 CodeBlob* cb = CodeCache::find_blob(pc); 2534 assert(cb != NULL && cb == this, ""); 2535 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2536 print(); 2537 method()->print_codes(); 2538 print_code(); 2539 print_pcs(); 2540 } 2541 #endif 2542 if (cont_offset == 0) { 2543 // Let the normal error handling report the exception 2544 return NULL; 2545 } 2546 return code_begin() + cont_offset; 2547 } 2548 2549 2550 2551 void nmethod_init() { 2552 // make sure you didn't forget to adjust the filler fields 2553 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2554 } 2555 2556 2557 //------------------------------------------------------------------------------------------- 2558 2559 2560 // QQQ might we make this work from a frame?? 2561 nmethodLocker::nmethodLocker(address pc) { 2562 CodeBlob* cb = CodeCache::find_blob(pc); 2563 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2564 _nm = (nmethod*)cb; 2565 lock_nmethod(_nm); 2566 } 2567 2568 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2569 // should pass zombie_ok == true. 2570 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2571 if (nm == NULL) return; 2572 Atomic::inc(&nm->_lock_count); 2573 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2574 } 2575 2576 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2577 if (nm == NULL) return; 2578 Atomic::dec(&nm->_lock_count); 2579 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2580 } 2581 2582 2583 // ----------------------------------------------------------------------------- 2584 // nmethod::get_deopt_original_pc 2585 // 2586 // Return the original PC for the given PC if: 2587 // (a) the given PC belongs to a nmethod and 2588 // (b) it is a deopt PC 2589 address nmethod::get_deopt_original_pc(const frame* fr) { 2590 if (fr->cb() == NULL) return NULL; 2591 2592 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2593 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2594 return nm->get_original_pc(fr); 2595 2596 return NULL; 2597 } 2598 2599 2600 // ----------------------------------------------------------------------------- 2601 // MethodHandle 2602 2603 bool nmethod::is_method_handle_return(address return_pc) { 2604 if (!has_method_handle_invokes()) return false; 2605 PcDesc* pd = pc_desc_at(return_pc); 2606 if (pd == NULL) 2607 return false; 2608 return pd->is_method_handle_invoke(); 2609 } 2610 2611 2612 // ----------------------------------------------------------------------------- 2613 // Verification 2614 2615 class VerifyOopsClosure: public OopClosure { 2616 nmethod* _nm; 2617 bool _ok; 2618 public: 2619 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2620 bool ok() { return _ok; } 2621 virtual void do_oop(oop* p) { 2622 if ((*p) == NULL || (*p)->is_oop()) return; 2623 if (_ok) { 2624 _nm->print_nmethod(true); 2625 _ok = false; 2626 } 2627 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2628 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2629 } 2630 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2631 }; 2632 2633 void nmethod::verify() { 2634 2635 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2636 // seems odd. 2637 2638 if( is_zombie() || is_not_entrant() ) 2639 return; 2640 2641 // Make sure all the entry points are correctly aligned for patching. 2642 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2643 2644 // assert(method()->is_oop(), "must be valid"); 2645 2646 ResourceMark rm; 2647 2648 if (!CodeCache::contains(this)) { 2649 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2650 } 2651 2652 if(is_native_method() ) 2653 return; 2654 2655 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2656 if (nm != this) { 2657 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2658 this)); 2659 } 2660 2661 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2662 if (! p->verify(this)) { 2663 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2664 } 2665 } 2666 2667 VerifyOopsClosure voc(this); 2668 oops_do(&voc); 2669 assert(voc.ok(), "embedded oops must be OK"); 2670 verify_scavenge_root_oops(); 2671 2672 verify_scopes(); 2673 } 2674 2675 2676 void nmethod::verify_interrupt_point(address call_site) { 2677 // Verify IC only when nmethod installation is finished. 2678 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2679 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2680 if (is_installed) { 2681 Thread *cur = Thread::current(); 2682 if (CompiledIC_lock->owner() == cur || 2683 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2684 SafepointSynchronize::is_at_safepoint())) { 2685 CompiledIC_at(this, call_site); 2686 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2687 } else { 2688 MutexLocker ml_verify (CompiledIC_lock); 2689 CompiledIC_at(this, call_site); 2690 } 2691 } 2692 2693 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2694 assert(pd != NULL, "PcDesc must exist"); 2695 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2696 pd->obj_decode_offset(), pd->should_reexecute(), 2697 pd->return_oop()); 2698 !sd->is_top(); sd = sd->sender()) { 2699 sd->verify(); 2700 } 2701 } 2702 2703 void nmethod::verify_scopes() { 2704 if( !method() ) return; // Runtime stubs have no scope 2705 if (method()->is_native()) return; // Ignore stub methods. 2706 // iterate through all interrupt point 2707 // and verify the debug information is valid. 2708 RelocIterator iter((nmethod*)this); 2709 while (iter.next()) { 2710 address stub = NULL; 2711 switch (iter.type()) { 2712 case relocInfo::virtual_call_type: 2713 verify_interrupt_point(iter.addr()); 2714 break; 2715 case relocInfo::opt_virtual_call_type: 2716 stub = iter.opt_virtual_call_reloc()->static_stub(); 2717 verify_interrupt_point(iter.addr()); 2718 break; 2719 case relocInfo::static_call_type: 2720 stub = iter.static_call_reloc()->static_stub(); 2721 //verify_interrupt_point(iter.addr()); 2722 break; 2723 case relocInfo::runtime_call_type: 2724 address destination = iter.reloc()->value(); 2725 // Right now there is no way to find out which entries support 2726 // an interrupt point. It would be nice if we had this 2727 // information in a table. 2728 break; 2729 } 2730 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2731 } 2732 } 2733 2734 2735 // ----------------------------------------------------------------------------- 2736 // Non-product code 2737 #ifndef PRODUCT 2738 2739 class DebugScavengeRoot: public OopClosure { 2740 nmethod* _nm; 2741 bool _ok; 2742 public: 2743 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2744 bool ok() { return _ok; } 2745 virtual void do_oop(oop* p) { 2746 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2747 if (_ok) { 2748 _nm->print_nmethod(true); 2749 _ok = false; 2750 } 2751 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2752 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2753 (*p)->print(); 2754 } 2755 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2756 }; 2757 2758 void nmethod::verify_scavenge_root_oops() { 2759 if (UseG1GC) { 2760 return; 2761 } 2762 2763 if (!on_scavenge_root_list()) { 2764 // Actually look inside, to verify the claim that it's clean. 2765 DebugScavengeRoot debug_scavenge_root(this); 2766 oops_do(&debug_scavenge_root); 2767 if (!debug_scavenge_root.ok()) 2768 fatal("found an unadvertised bad scavengable oop in the code cache"); 2769 } 2770 assert(scavenge_root_not_marked(), ""); 2771 } 2772 2773 #endif // PRODUCT 2774 2775 // Printing operations 2776 2777 void nmethod::print() const { 2778 ResourceMark rm; 2779 ttyLocker ttyl; // keep the following output all in one block 2780 2781 tty->print("Compiled method "); 2782 2783 if (is_compiled_by_c1()) { 2784 tty->print("(c1) "); 2785 } else if (is_compiled_by_c2()) { 2786 tty->print("(c2) "); 2787 } else if (is_compiled_by_shark()) { 2788 tty->print("(shark) "); 2789 } else { 2790 tty->print("(nm) "); 2791 } 2792 2793 print_on(tty, NULL); 2794 2795 if (WizardMode) { 2796 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2797 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2798 tty->print(" { "); 2799 if (is_in_use()) tty->print("in_use "); 2800 if (is_not_entrant()) tty->print("not_entrant "); 2801 if (is_zombie()) tty->print("zombie "); 2802 if (is_unloaded()) tty->print("unloaded "); 2803 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2804 tty->print_cr("}:"); 2805 } 2806 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2807 (address)this, 2808 (address)this + size(), 2809 size()); 2810 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2811 relocation_begin(), 2812 relocation_end(), 2813 relocation_size()); 2814 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2815 consts_begin(), 2816 consts_end(), 2817 consts_size()); 2818 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2819 insts_begin(), 2820 insts_end(), 2821 insts_size()); 2822 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2823 stub_begin(), 2824 stub_end(), 2825 stub_size()); 2826 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2827 oops_begin(), 2828 oops_end(), 2829 oops_size()); 2830 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2831 metadata_begin(), 2832 metadata_end(), 2833 metadata_size()); 2834 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2835 scopes_data_begin(), 2836 scopes_data_end(), 2837 scopes_data_size()); 2838 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2839 scopes_pcs_begin(), 2840 scopes_pcs_end(), 2841 scopes_pcs_size()); 2842 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2843 dependencies_begin(), 2844 dependencies_end(), 2845 dependencies_size()); 2846 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2847 handler_table_begin(), 2848 handler_table_end(), 2849 handler_table_size()); 2850 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2851 nul_chk_table_begin(), 2852 nul_chk_table_end(), 2853 nul_chk_table_size()); 2854 } 2855 2856 void nmethod::print_code() { 2857 HandleMark hm; 2858 ResourceMark m; 2859 Disassembler::decode(this); 2860 } 2861 2862 2863 #ifndef PRODUCT 2864 2865 void nmethod::print_scopes() { 2866 // Find the first pc desc for all scopes in the code and print it. 2867 ResourceMark rm; 2868 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2869 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2870 continue; 2871 2872 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2873 sd->print_on(tty, p); 2874 } 2875 } 2876 2877 void nmethod::print_dependencies() { 2878 ResourceMark rm; 2879 ttyLocker ttyl; // keep the following output all in one block 2880 tty->print_cr("Dependencies:"); 2881 for (Dependencies::DepStream deps(this); deps.next(); ) { 2882 deps.print_dependency(); 2883 Klass* ctxk = deps.context_type(); 2884 if (ctxk != NULL) { 2885 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2886 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2887 } 2888 } 2889 deps.log_dependency(); // put it into the xml log also 2890 } 2891 } 2892 2893 2894 void nmethod::print_relocations() { 2895 ResourceMark m; // in case methods get printed via the debugger 2896 tty->print_cr("relocations:"); 2897 RelocIterator iter(this); 2898 iter.print(); 2899 if (UseRelocIndex) { 2900 jint* index_end = (jint*)relocation_end() - 1; 2901 jint index_size = *index_end; 2902 jint* index_start = (jint*)( (address)index_end - index_size ); 2903 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2904 if (index_size > 0) { 2905 jint* ip; 2906 for (ip = index_start; ip+2 <= index_end; ip += 2) 2907 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2908 ip[0], 2909 ip[1], 2910 header_end()+ip[0], 2911 relocation_begin()-1+ip[1]); 2912 for (; ip < index_end; ip++) 2913 tty->print_cr(" (%d ?)", ip[0]); 2914 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2915 ip++; 2916 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2917 } 2918 } 2919 } 2920 2921 2922 void nmethod::print_pcs() { 2923 ResourceMark m; // in case methods get printed via debugger 2924 tty->print_cr("pc-bytecode offsets:"); 2925 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2926 p->print(this); 2927 } 2928 } 2929 2930 #endif // PRODUCT 2931 2932 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2933 RelocIterator iter(this, begin, end); 2934 bool have_one = false; 2935 while (iter.next()) { 2936 have_one = true; 2937 switch (iter.type()) { 2938 case relocInfo::none: return "no_reloc"; 2939 case relocInfo::oop_type: { 2940 stringStream st; 2941 oop_Relocation* r = iter.oop_reloc(); 2942 oop obj = r->oop_value(); 2943 st.print("oop("); 2944 if (obj == NULL) st.print("NULL"); 2945 else obj->print_value_on(&st); 2946 st.print(")"); 2947 return st.as_string(); 2948 } 2949 case relocInfo::metadata_type: { 2950 stringStream st; 2951 metadata_Relocation* r = iter.metadata_reloc(); 2952 Metadata* obj = r->metadata_value(); 2953 st.print("metadata("); 2954 if (obj == NULL) st.print("NULL"); 2955 else obj->print_value_on(&st); 2956 st.print(")"); 2957 return st.as_string(); 2958 } 2959 case relocInfo::virtual_call_type: return "virtual_call"; 2960 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2961 case relocInfo::static_call_type: return "static_call"; 2962 case relocInfo::static_stub_type: return "static_stub"; 2963 case relocInfo::runtime_call_type: return "runtime_call"; 2964 case relocInfo::external_word_type: return "external_word"; 2965 case relocInfo::internal_word_type: return "internal_word"; 2966 case relocInfo::section_word_type: return "section_word"; 2967 case relocInfo::poll_type: return "poll"; 2968 case relocInfo::poll_return_type: return "poll_return"; 2969 case relocInfo::type_mask: return "type_bit_mask"; 2970 } 2971 } 2972 return have_one ? "other" : NULL; 2973 } 2974 2975 // Return a the last scope in (begin..end] 2976 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2977 PcDesc* p = pc_desc_near(begin+1); 2978 if (p != NULL && p->real_pc(this) <= end) { 2979 return new ScopeDesc(this, p->scope_decode_offset(), 2980 p->obj_decode_offset(), p->should_reexecute(), 2981 p->return_oop()); 2982 } 2983 return NULL; 2984 } 2985 2986 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2987 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2988 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2989 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2990 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2991 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2992 2993 if (has_method_handle_invokes()) 2994 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2995 2996 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2997 2998 if (block_begin == entry_point()) { 2999 methodHandle m = method(); 3000 if (m.not_null()) { 3001 stream->print(" # "); 3002 m->print_value_on(stream); 3003 stream->cr(); 3004 } 3005 if (m.not_null() && !is_osr_method()) { 3006 ResourceMark rm; 3007 int sizeargs = m->size_of_parameters(); 3008 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3009 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3010 { 3011 int sig_index = 0; 3012 if (!m->is_static()) 3013 sig_bt[sig_index++] = T_OBJECT; // 'this' 3014 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3015 BasicType t = ss.type(); 3016 sig_bt[sig_index++] = t; 3017 if (type2size[t] == 2) { 3018 sig_bt[sig_index++] = T_VOID; 3019 } else { 3020 assert(type2size[t] == 1, "size is 1 or 2"); 3021 } 3022 } 3023 assert(sig_index == sizeargs, ""); 3024 } 3025 const char* spname = "sp"; // make arch-specific? 3026 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3027 int stack_slot_offset = this->frame_size() * wordSize; 3028 int tab1 = 14, tab2 = 24; 3029 int sig_index = 0; 3030 int arg_index = (m->is_static() ? 0 : -1); 3031 bool did_old_sp = false; 3032 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3033 bool at_this = (arg_index == -1); 3034 bool at_old_sp = false; 3035 BasicType t = (at_this ? T_OBJECT : ss.type()); 3036 assert(t == sig_bt[sig_index], "sigs in sync"); 3037 if (at_this) 3038 stream->print(" # this: "); 3039 else 3040 stream->print(" # parm%d: ", arg_index); 3041 stream->move_to(tab1); 3042 VMReg fst = regs[sig_index].first(); 3043 VMReg snd = regs[sig_index].second(); 3044 if (fst->is_reg()) { 3045 stream->print("%s", fst->name()); 3046 if (snd->is_valid()) { 3047 stream->print(":%s", snd->name()); 3048 } 3049 } else if (fst->is_stack()) { 3050 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3051 if (offset == stack_slot_offset) at_old_sp = true; 3052 stream->print("[%s+0x%x]", spname, offset); 3053 } else { 3054 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3055 } 3056 stream->print(" "); 3057 stream->move_to(tab2); 3058 stream->print("= "); 3059 if (at_this) { 3060 m->method_holder()->print_value_on(stream); 3061 } else { 3062 bool did_name = false; 3063 if (!at_this && ss.is_object()) { 3064 Symbol* name = ss.as_symbol_or_null(); 3065 if (name != NULL) { 3066 name->print_value_on(stream); 3067 did_name = true; 3068 } 3069 } 3070 if (!did_name) 3071 stream->print("%s", type2name(t)); 3072 } 3073 if (at_old_sp) { 3074 stream->print(" (%s of caller)", spname); 3075 did_old_sp = true; 3076 } 3077 stream->cr(); 3078 sig_index += type2size[t]; 3079 arg_index += 1; 3080 if (!at_this) ss.next(); 3081 } 3082 if (!did_old_sp) { 3083 stream->print(" # "); 3084 stream->move_to(tab1); 3085 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3086 stream->print(" (%s of caller)", spname); 3087 stream->cr(); 3088 } 3089 } 3090 } 3091 } 3092 3093 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3094 // First, find an oopmap in (begin, end]. 3095 // We use the odd half-closed interval so that oop maps and scope descs 3096 // which are tied to the byte after a call are printed with the call itself. 3097 address base = code_begin(); 3098 OopMapSet* oms = oop_maps(); 3099 if (oms != NULL) { 3100 for (int i = 0, imax = oms->size(); i < imax; i++) { 3101 OopMap* om = oms->at(i); 3102 address pc = base + om->offset(); 3103 if (pc > begin) { 3104 if (pc <= end) { 3105 st->move_to(column); 3106 st->print("; "); 3107 om->print_on(st); 3108 } 3109 break; 3110 } 3111 } 3112 } 3113 3114 // Print any debug info present at this pc. 3115 ScopeDesc* sd = scope_desc_in(begin, end); 3116 if (sd != NULL) { 3117 st->move_to(column); 3118 if (sd->bci() == SynchronizationEntryBCI) { 3119 st->print(";*synchronization entry"); 3120 } else { 3121 if (sd->method() == NULL) { 3122 st->print("method is NULL"); 3123 } else if (sd->method()->is_native()) { 3124 st->print("method is native"); 3125 } else { 3126 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3127 st->print(";*%s", Bytecodes::name(bc)); 3128 switch (bc) { 3129 case Bytecodes::_invokevirtual: 3130 case Bytecodes::_invokespecial: 3131 case Bytecodes::_invokestatic: 3132 case Bytecodes::_invokeinterface: 3133 { 3134 Bytecode_invoke invoke(sd->method(), sd->bci()); 3135 st->print(" "); 3136 if (invoke.name() != NULL) 3137 invoke.name()->print_symbol_on(st); 3138 else 3139 st->print("<UNKNOWN>"); 3140 break; 3141 } 3142 case Bytecodes::_getfield: 3143 case Bytecodes::_putfield: 3144 case Bytecodes::_getstatic: 3145 case Bytecodes::_putstatic: 3146 { 3147 Bytecode_field field(sd->method(), sd->bci()); 3148 st->print(" "); 3149 if (field.name() != NULL) 3150 field.name()->print_symbol_on(st); 3151 else 3152 st->print("<UNKNOWN>"); 3153 } 3154 } 3155 } 3156 } 3157 3158 // Print all scopes 3159 for (;sd != NULL; sd = sd->sender()) { 3160 st->move_to(column); 3161 st->print("; -"); 3162 if (sd->method() == NULL) { 3163 st->print("method is NULL"); 3164 } else { 3165 sd->method()->print_short_name(st); 3166 } 3167 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3168 if (lineno != -1) { 3169 st->print("@%d (line %d)", sd->bci(), lineno); 3170 } else { 3171 st->print("@%d", sd->bci()); 3172 } 3173 st->cr(); 3174 } 3175 } 3176 3177 // Print relocation information 3178 const char* str = reloc_string_for(begin, end); 3179 if (str != NULL) { 3180 if (sd != NULL) st->cr(); 3181 st->move_to(column); 3182 st->print("; {%s}", str); 3183 } 3184 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3185 if (cont_offset != 0) { 3186 st->move_to(column); 3187 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3188 } 3189 3190 } 3191 3192 #ifndef PRODUCT 3193 3194 void nmethod::print_value_on(outputStream* st) const { 3195 st->print("nmethod"); 3196 print_on(st, NULL); 3197 } 3198 3199 void nmethod::print_calls(outputStream* st) { 3200 RelocIterator iter(this); 3201 while (iter.next()) { 3202 switch (iter.type()) { 3203 case relocInfo::virtual_call_type: 3204 case relocInfo::opt_virtual_call_type: { 3205 VerifyMutexLocker mc(CompiledIC_lock); 3206 CompiledIC_at(&iter)->print(); 3207 break; 3208 } 3209 case relocInfo::static_call_type: 3210 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3211 compiledStaticCall_at(iter.reloc())->print(); 3212 break; 3213 } 3214 } 3215 } 3216 3217 void nmethod::print_handler_table() { 3218 ExceptionHandlerTable(this).print(); 3219 } 3220 3221 void nmethod::print_nul_chk_table() { 3222 ImplicitExceptionTable(this).print(code_begin()); 3223 } 3224 3225 void nmethod::print_statistics() { 3226 ttyLocker ttyl; 3227 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3228 nmethod_stats.print_native_nmethod_stats(); 3229 nmethod_stats.print_nmethod_stats(); 3230 DebugInformationRecorder::print_statistics(); 3231 nmethod_stats.print_pc_stats(); 3232 Dependencies::print_statistics(); 3233 if (xtty != NULL) xtty->tail("statistics"); 3234 } 3235 3236 #endif // PRODUCT