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