1 /* 2 * Copyright (c) 1997, 2015, 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/compilerDirectives.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/bytecode.hpp" 37 #include "oops/methodData.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/jvmtiRedefineClassesTrace.hpp" 40 #include "prims/jvmtiImpl.hpp" 41 #include "runtime/atomic.inline.hpp" 42 #include "runtime/orderAccess.inline.hpp" 43 #include "runtime/sharedRuntime.hpp" 44 #include "runtime/sweeper.hpp" 45 #include "utilities/resourceHash.hpp" 46 #include "utilities/dtrace.hpp" 47 #include "utilities/events.hpp" 48 #include "utilities/xmlstream.hpp" 49 #ifdef SHARK 50 #include "shark/sharkCompiler.hpp" 51 #endif 52 53 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 54 55 unsigned char nmethod::_global_unloading_clock = 0; 56 57 #ifdef DTRACE_ENABLED 58 59 // Only bother with this argument setup if dtrace is available 60 61 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 62 { \ 63 Method* m = (method); \ 64 if (m != NULL) { \ 65 Symbol* klass_name = m->klass_name(); \ 66 Symbol* name = m->name(); \ 67 Symbol* signature = m->signature(); \ 68 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 69 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 70 (char *) name->bytes(), name->utf8_length(), \ 71 (char *) signature->bytes(), signature->utf8_length()); \ 72 } \ 73 } 74 75 #else // ndef DTRACE_ENABLED 76 77 #define DTRACE_METHOD_UNLOAD_PROBE(method) 78 79 #endif 80 81 bool nmethod::is_compiled_by_c1() const { 82 if (compiler() == NULL) { 83 return false; 84 } 85 return compiler()->is_c1(); 86 } 87 bool nmethod::is_compiled_by_c2() const { 88 if (compiler() == NULL) { 89 return false; 90 } 91 return compiler()->is_c2(); 92 } 93 bool nmethod::is_compiled_by_shark() const { 94 if (compiler() == NULL) { 95 return false; 96 } 97 return compiler()->is_shark(); 98 } 99 100 101 102 //--------------------------------------------------------------------------------- 103 // NMethod statistics 104 // They are printed under various flags, including: 105 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 106 // (In the latter two cases, they like other stats are printed to the log only.) 107 108 #ifndef PRODUCT 109 // These variables are put into one block to reduce relocations 110 // and make it simpler to print from the debugger. 111 static 112 struct nmethod_stats_struct { 113 int nmethod_count; 114 int total_size; 115 int relocation_size; 116 int consts_size; 117 int insts_size; 118 int stub_size; 119 int scopes_data_size; 120 int scopes_pcs_size; 121 int dependencies_size; 122 int handler_table_size; 123 int nul_chk_table_size; 124 int oops_size; 125 126 void note_nmethod(nmethod* nm) { 127 nmethod_count += 1; 128 total_size += nm->size(); 129 relocation_size += nm->relocation_size(); 130 consts_size += nm->consts_size(); 131 insts_size += nm->insts_size(); 132 stub_size += nm->stub_size(); 133 oops_size += nm->oops_size(); 134 scopes_data_size += nm->scopes_data_size(); 135 scopes_pcs_size += nm->scopes_pcs_size(); 136 dependencies_size += nm->dependencies_size(); 137 handler_table_size += nm->handler_table_size(); 138 nul_chk_table_size += nm->nul_chk_table_size(); 139 } 140 void print_nmethod_stats() { 141 if (nmethod_count == 0) return; 142 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 143 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 144 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 145 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 146 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 147 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 148 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 149 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 150 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 151 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 152 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 153 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 154 } 155 156 int native_nmethod_count; 157 int native_total_size; 158 int native_relocation_size; 159 int native_insts_size; 160 int native_oops_size; 161 void note_native_nmethod(nmethod* nm) { 162 native_nmethod_count += 1; 163 native_total_size += nm->size(); 164 native_relocation_size += nm->relocation_size(); 165 native_insts_size += nm->insts_size(); 166 native_oops_size += nm->oops_size(); 167 } 168 void print_native_nmethod_stats() { 169 if (native_nmethod_count == 0) return; 170 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 171 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 172 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 173 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 174 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 175 } 176 177 int pc_desc_resets; // number of resets (= number of caches) 178 int pc_desc_queries; // queries to nmethod::find_pc_desc 179 int pc_desc_approx; // number of those which have approximate true 180 int pc_desc_repeats; // number of _pc_descs[0] hits 181 int pc_desc_hits; // number of LRU cache hits 182 int pc_desc_tests; // total number of PcDesc examinations 183 int pc_desc_searches; // total number of quasi-binary search steps 184 int pc_desc_adds; // number of LUR cache insertions 185 186 void print_pc_stats() { 187 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 188 pc_desc_queries, 189 (double)(pc_desc_tests + pc_desc_searches) 190 / pc_desc_queries); 191 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 192 pc_desc_resets, 193 pc_desc_queries, pc_desc_approx, 194 pc_desc_repeats, pc_desc_hits, 195 pc_desc_tests, pc_desc_searches, pc_desc_adds); 196 } 197 } nmethod_stats; 198 #endif //PRODUCT 199 200 201 //--------------------------------------------------------------------------------- 202 203 204 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 205 assert(pc != NULL, "Must be non null"); 206 assert(exception.not_null(), "Must be non null"); 207 assert(handler != NULL, "Must be non null"); 208 209 _count = 0; 210 _exception_type = exception->klass(); 211 _next = NULL; 212 213 add_address_and_handler(pc,handler); 214 } 215 216 217 address ExceptionCache::match(Handle exception, address pc) { 218 assert(pc != NULL,"Must be non null"); 219 assert(exception.not_null(),"Must be non null"); 220 if (exception->klass() == exception_type()) { 221 return (test_address(pc)); 222 } 223 224 return NULL; 225 } 226 227 228 bool ExceptionCache::match_exception_with_space(Handle exception) { 229 assert(exception.not_null(),"Must be non null"); 230 if (exception->klass() == exception_type() && count() < cache_size) { 231 return true; 232 } 233 return false; 234 } 235 236 237 address ExceptionCache::test_address(address addr) { 238 for (int i=0; i<count(); i++) { 239 if (pc_at(i) == addr) { 240 return handler_at(i); 241 } 242 } 243 return NULL; 244 } 245 246 247 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 248 if (test_address(addr) == handler) return true; 249 if (count() < cache_size) { 250 set_pc_at(count(),addr); 251 set_handler_at(count(), handler); 252 increment_count(); 253 return true; 254 } 255 return false; 256 } 257 258 259 // private method for handling exception cache 260 // These methods are private, and used to manipulate the exception cache 261 // directly. 262 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 263 ExceptionCache* ec = exception_cache(); 264 while (ec != NULL) { 265 if (ec->match_exception_with_space(exception)) { 266 return ec; 267 } 268 ec = ec->next(); 269 } 270 return NULL; 271 } 272 273 274 //----------------------------------------------------------------------------- 275 276 277 // Helper used by both find_pc_desc methods. 278 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 279 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 280 if (!approximate) 281 return pc->pc_offset() == pc_offset; 282 else 283 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 284 } 285 286 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 287 if (initial_pc_desc == NULL) { 288 _pc_descs[0] = NULL; // native method; no PcDescs at all 289 return; 290 } 291 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 292 // reset the cache by filling it with benign (non-null) values 293 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 294 for (int i = 0; i < cache_size; i++) 295 _pc_descs[i] = initial_pc_desc; 296 } 297 298 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 299 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 300 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 301 302 // Note: one might think that caching the most recently 303 // read value separately would be a win, but one would be 304 // wrong. When many threads are updating it, the cache 305 // line it's in would bounce between caches, negating 306 // any benefit. 307 308 // In order to prevent race conditions do not load cache elements 309 // repeatedly, but use a local copy: 310 PcDesc* res; 311 312 // Step one: Check the most recently added value. 313 res = _pc_descs[0]; 314 if (res == NULL) return NULL; // native method; no PcDescs at all 315 if (match_desc(res, pc_offset, approximate)) { 316 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 317 return res; 318 } 319 320 // Step two: Check the rest of the LRU cache. 321 for (int i = 1; i < cache_size; ++i) { 322 res = _pc_descs[i]; 323 if (res->pc_offset() < 0) break; // optimization: skip empty cache 324 if (match_desc(res, pc_offset, approximate)) { 325 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 326 return res; 327 } 328 } 329 330 // Report failure. 331 return NULL; 332 } 333 334 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 335 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 336 // Update the LRU cache by shifting pc_desc forward. 337 for (int i = 0; i < cache_size; i++) { 338 PcDesc* next = _pc_descs[i]; 339 _pc_descs[i] = pc_desc; 340 pc_desc = next; 341 } 342 } 343 344 // adjust pcs_size so that it is a multiple of both oopSize and 345 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 346 // of oopSize, then 2*sizeof(PcDesc) is) 347 static int adjust_pcs_size(int pcs_size) { 348 int nsize = round_to(pcs_size, oopSize); 349 if ((nsize % sizeof(PcDesc)) != 0) { 350 nsize = pcs_size + sizeof(PcDesc); 351 } 352 assert((nsize % oopSize) == 0, "correct alignment"); 353 return nsize; 354 } 355 356 //----------------------------------------------------------------------------- 357 358 359 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 360 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 361 assert(new_entry != NULL,"Must be non null"); 362 assert(new_entry->next() == NULL, "Must be null"); 363 364 if (exception_cache() != NULL) { 365 new_entry->set_next(exception_cache()); 366 } 367 set_exception_cache(new_entry); 368 } 369 370 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 371 ExceptionCache* prev = NULL; 372 ExceptionCache* curr = exception_cache(); 373 374 while (curr != NULL) { 375 ExceptionCache* next = curr->next(); 376 377 Klass* ex_klass = curr->exception_type(); 378 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 379 if (prev == NULL) { 380 set_exception_cache(next); 381 } else { 382 prev->set_next(next); 383 } 384 delete curr; 385 // prev stays the same. 386 } else { 387 prev = curr; 388 } 389 390 curr = next; 391 } 392 } 393 394 // public method for accessing the exception cache 395 // These are the public access methods. 396 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 397 // We never grab a lock to read the exception cache, so we may 398 // have false negatives. This is okay, as it can only happen during 399 // the first few exception lookups for a given nmethod. 400 ExceptionCache* ec = exception_cache(); 401 while (ec != NULL) { 402 address ret_val; 403 if ((ret_val = ec->match(exception,pc)) != NULL) { 404 return ret_val; 405 } 406 ec = ec->next(); 407 } 408 return NULL; 409 } 410 411 412 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 413 // There are potential race conditions during exception cache updates, so we 414 // must own the ExceptionCache_lock before doing ANY modifications. Because 415 // we don't lock during reads, it is possible to have several threads attempt 416 // to update the cache with the same data. We need to check for already inserted 417 // copies of the current data before adding it. 418 419 MutexLocker ml(ExceptionCache_lock); 420 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 421 422 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 423 target_entry = new ExceptionCache(exception,pc,handler); 424 add_exception_cache_entry(target_entry); 425 } 426 } 427 428 429 //-------------end of code for ExceptionCache-------------- 430 431 432 int nmethod::total_size() const { 433 return 434 consts_size() + 435 insts_size() + 436 stub_size() + 437 scopes_data_size() + 438 scopes_pcs_size() + 439 handler_table_size() + 440 nul_chk_table_size(); 441 } 442 443 const char* nmethod::compile_kind() const { 444 if (is_osr_method()) return "osr"; 445 if (method() != NULL && is_native_method()) return "c2n"; 446 return NULL; 447 } 448 449 // Fill in default values for various flag fields 450 void nmethod::init_defaults() { 451 _state = in_use; 452 _unloading_clock = 0; 453 _marked_for_reclamation = 0; 454 _has_flushed_dependencies = 0; 455 _has_unsafe_access = 0; 456 _has_method_handle_invokes = 0; 457 _lazy_critical_native = 0; 458 _has_wide_vectors = 0; 459 _marked_for_deoptimization = 0; 460 _lock_count = 0; 461 _stack_traversal_mark = 0; 462 _unload_reported = false; // jvmti state 463 464 #ifdef ASSERT 465 _oops_are_stale = false; 466 #endif 467 468 _oops_do_mark_link = NULL; 469 _jmethod_id = NULL; 470 _osr_link = NULL; 471 if (UseG1GC) { 472 _unloading_next = NULL; 473 } else { 474 _scavenge_root_link = NULL; 475 } 476 _scavenge_root_state = 0; 477 _compiler = NULL; 478 #if INCLUDE_RTM_OPT 479 _rtm_state = NoRTM; 480 #endif 481 } 482 483 nmethod* nmethod::new_native_nmethod(methodHandle method, 484 int compile_id, 485 CodeBuffer *code_buffer, 486 int vep_offset, 487 int frame_complete, 488 int frame_size, 489 ByteSize basic_lock_owner_sp_offset, 490 ByteSize basic_lock_sp_offset, 491 OopMapSet* oop_maps) { 492 code_buffer->finalize_oop_references(method); 493 // create nmethod 494 nmethod* nm = NULL; 495 { 496 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 497 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 498 CodeOffsets offsets; 499 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 500 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 501 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 502 compile_id, &offsets, 503 code_buffer, frame_size, 504 basic_lock_owner_sp_offset, 505 basic_lock_sp_offset, oop_maps); 506 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 507 } 508 // verify nmethod 509 debug_only(if (nm) nm->verify();) // might block 510 511 if (nm != NULL) { 512 nm->log_new_nmethod(); 513 } 514 515 return nm; 516 } 517 518 nmethod* nmethod::new_nmethod(methodHandle method, 519 int compile_id, 520 int entry_bci, 521 CodeOffsets* offsets, 522 int orig_pc_offset, 523 DebugInformationRecorder* debug_info, 524 Dependencies* dependencies, 525 CodeBuffer* code_buffer, int frame_size, 526 OopMapSet* oop_maps, 527 ExceptionHandlerTable* handler_table, 528 ImplicitExceptionTable* nul_chk_table, 529 AbstractCompiler* compiler, 530 int comp_level 531 ) 532 { 533 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 534 code_buffer->finalize_oop_references(method); 535 // create nmethod 536 nmethod* nm = NULL; 537 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 538 int nmethod_size = 539 allocation_size(code_buffer, sizeof(nmethod)) 540 + adjust_pcs_size(debug_info->pcs_size()) 541 + round_to(dependencies->size_in_bytes() , oopSize) 542 + round_to(handler_table->size_in_bytes(), oopSize) 543 + round_to(nul_chk_table->size_in_bytes(), oopSize) 544 + round_to(debug_info->data_size() , oopSize); 545 546 nm = new (nmethod_size, comp_level) 547 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 548 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 549 oop_maps, 550 handler_table, 551 nul_chk_table, 552 compiler, 553 comp_level); 554 555 if (nm != NULL) { 556 // To make dependency checking during class loading fast, record 557 // the nmethod dependencies in the classes it is dependent on. 558 // This allows the dependency checking code to simply walk the 559 // class hierarchy above the loaded class, checking only nmethods 560 // which are dependent on those classes. The slow way is to 561 // check every nmethod for dependencies which makes it linear in 562 // the number of methods compiled. For applications with a lot 563 // classes the slow way is too slow. 564 for (Dependencies::DepStream deps(nm); deps.next(); ) { 565 if (deps.type() == Dependencies::call_site_target_value) { 566 // CallSite dependencies are managed on per-CallSite instance basis. 567 oop call_site = deps.argument_oop(0); 568 MethodHandles::add_dependent_nmethod(call_site, nm); 569 } else { 570 Klass* klass = deps.context_type(); 571 if (klass == NULL) { 572 continue; // ignore things like evol_method 573 } 574 // record this nmethod as dependent on this klass 575 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 576 } 577 } 578 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 579 } 580 } 581 // Do verification and logging outside CodeCache_lock. 582 if (nm != NULL) { 583 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 584 DEBUG_ONLY(nm->verify();) 585 nm->log_new_nmethod(); 586 } 587 return nm; 588 } 589 590 591 // For native wrappers 592 nmethod::nmethod( 593 Method* method, 594 int nmethod_size, 595 int compile_id, 596 CodeOffsets* offsets, 597 CodeBuffer* code_buffer, 598 int frame_size, 599 ByteSize basic_lock_owner_sp_offset, 600 ByteSize basic_lock_sp_offset, 601 OopMapSet* oop_maps ) 602 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 603 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 604 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 605 _native_basic_lock_sp_offset(basic_lock_sp_offset) 606 { 607 { 608 debug_only(No_Safepoint_Verifier nsv;) 609 assert_locked_or_safepoint(CodeCache_lock); 610 611 init_defaults(); 612 _method = method; 613 _entry_bci = InvocationEntryBci; 614 // We have no exception handler or deopt handler make the 615 // values something that will never match a pc like the nmethod vtable entry 616 _exception_offset = 0; 617 _deoptimize_offset = 0; 618 _deoptimize_mh_offset = 0; 619 _orig_pc_offset = 0; 620 621 _consts_offset = data_offset(); 622 _stub_offset = data_offset(); 623 _oops_offset = data_offset(); 624 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 625 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 626 _scopes_pcs_offset = _scopes_data_offset; 627 _dependencies_offset = _scopes_pcs_offset; 628 _handler_table_offset = _dependencies_offset; 629 _nul_chk_table_offset = _handler_table_offset; 630 _nmethod_end_offset = _nul_chk_table_offset; 631 _compile_id = compile_id; 632 _comp_level = CompLevel_none; 633 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 634 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 635 _osr_entry_point = NULL; 636 _exception_cache = NULL; 637 _pc_desc_cache.reset_to(NULL); 638 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 639 640 code_buffer->copy_values_to(this); 641 if (ScavengeRootsInCode) { 642 if (detect_scavenge_root_oops()) { 643 CodeCache::add_scavenge_root_nmethod(this); 644 } 645 Universe::heap()->register_nmethod(this); 646 } 647 debug_only(verify_scavenge_root_oops()); 648 CodeCache::commit(this); 649 } 650 651 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 652 ttyLocker ttyl; // keep the following output all in one block 653 // This output goes directly to the tty, not the compiler log. 654 // To enable tools to match it up with the compilation activity, 655 // be sure to tag this tty output with the compile ID. 656 if (xtty != NULL) { 657 xtty->begin_head("print_native_nmethod"); 658 xtty->method(_method); 659 xtty->stamp(); 660 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 661 } 662 // print the header part first 663 print(); 664 // then print the requested information 665 if (PrintNativeNMethods) { 666 print_code(); 667 if (oop_maps != NULL) { 668 oop_maps->print(); 669 } 670 } 671 if (PrintRelocations) { 672 print_relocations(); 673 } 674 if (xtty != NULL) { 675 xtty->tail("print_native_nmethod"); 676 } 677 } 678 } 679 680 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 681 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 682 } 683 684 nmethod::nmethod( 685 Method* method, 686 int nmethod_size, 687 int compile_id, 688 int entry_bci, 689 CodeOffsets* offsets, 690 int orig_pc_offset, 691 DebugInformationRecorder* debug_info, 692 Dependencies* dependencies, 693 CodeBuffer *code_buffer, 694 int frame_size, 695 OopMapSet* oop_maps, 696 ExceptionHandlerTable* handler_table, 697 ImplicitExceptionTable* nul_chk_table, 698 AbstractCompiler* compiler, 699 int comp_level 700 ) 701 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 702 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 703 _native_receiver_sp_offset(in_ByteSize(-1)), 704 _native_basic_lock_sp_offset(in_ByteSize(-1)) 705 { 706 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 707 { 708 debug_only(No_Safepoint_Verifier nsv;) 709 assert_locked_or_safepoint(CodeCache_lock); 710 711 init_defaults(); 712 _method = method; 713 _entry_bci = entry_bci; 714 _compile_id = compile_id; 715 _comp_level = comp_level; 716 _compiler = compiler; 717 _orig_pc_offset = orig_pc_offset; 718 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 719 720 // Section offsets 721 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 722 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 723 724 // Exception handler and deopt handler are in the stub section 725 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 726 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 727 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 728 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 729 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 730 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 731 } else { 732 _deoptimize_mh_offset = -1; 733 } 734 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 735 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 736 } else { 737 _unwind_handler_offset = -1; 738 } 739 740 _oops_offset = data_offset(); 741 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 742 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 743 744 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 745 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 746 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 747 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 748 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 749 750 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 751 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 752 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 753 _exception_cache = NULL; 754 _pc_desc_cache.reset_to(scopes_pcs_begin()); 755 756 // Copy contents of ScopeDescRecorder to nmethod 757 code_buffer->copy_values_to(this); 758 debug_info->copy_to(this); 759 dependencies->copy_to(this); 760 if (ScavengeRootsInCode) { 761 if (detect_scavenge_root_oops()) { 762 CodeCache::add_scavenge_root_nmethod(this); 763 } 764 Universe::heap()->register_nmethod(this); 765 } 766 debug_only(verify_scavenge_root_oops()); 767 768 CodeCache::commit(this); 769 770 // Copy contents of ExceptionHandlerTable to nmethod 771 handler_table->copy_to(this); 772 nul_chk_table->copy_to(this); 773 774 // we use the information of entry points to find out if a method is 775 // static or non static 776 assert(compiler->is_c2() || 777 _method->is_static() == (entry_point() == _verified_entry_point), 778 " entry points must be same for static methods and vice versa"); 779 } 780 } 781 782 // Print a short set of xml attributes to identify this nmethod. The 783 // output should be embedded in some other element. 784 void nmethod::log_identity(xmlStream* log) const { 785 log->print(" compile_id='%d'", compile_id()); 786 const char* nm_kind = compile_kind(); 787 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 788 if (compiler() != NULL) { 789 log->print(" compiler='%s'", compiler()->name()); 790 } 791 if (TieredCompilation) { 792 log->print(" level='%d'", comp_level()); 793 } 794 } 795 796 797 #define LOG_OFFSET(log, name) \ 798 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 799 log->print(" " XSTR(name) "_offset='%d'" , \ 800 (intptr_t)name##_begin() - (intptr_t)this) 801 802 803 void nmethod::log_new_nmethod() const { 804 if (LogCompilation && xtty != NULL) { 805 ttyLocker ttyl; 806 HandleMark hm; 807 xtty->begin_elem("nmethod"); 808 log_identity(xtty); 809 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 810 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 811 812 LOG_OFFSET(xtty, relocation); 813 LOG_OFFSET(xtty, consts); 814 LOG_OFFSET(xtty, insts); 815 LOG_OFFSET(xtty, stub); 816 LOG_OFFSET(xtty, scopes_data); 817 LOG_OFFSET(xtty, scopes_pcs); 818 LOG_OFFSET(xtty, dependencies); 819 LOG_OFFSET(xtty, handler_table); 820 LOG_OFFSET(xtty, nul_chk_table); 821 LOG_OFFSET(xtty, oops); 822 823 xtty->method(method()); 824 xtty->stamp(); 825 xtty->end_elem(); 826 } 827 } 828 829 #undef LOG_OFFSET 830 831 832 // Print out more verbose output usually for a newly created nmethod. 833 void nmethod::print_on(outputStream* st, const char* msg) const { 834 if (st != NULL) { 835 ttyLocker ttyl; 836 if (WizardMode) { 837 CompileTask::print(st, this, msg, /*short_form:*/ true); 838 st->print_cr(" (" INTPTR_FORMAT ")", this); 839 } else { 840 CompileTask::print(st, this, msg, /*short_form:*/ false); 841 } 842 } 843 } 844 845 846 void nmethod::print_nmethod(bool printmethod) { 847 ttyLocker ttyl; // keep the following output all in one block 848 if (xtty != NULL) { 849 xtty->begin_head("print_nmethod"); 850 xtty->stamp(); 851 xtty->end_head(); 852 } 853 // print the header part first 854 print(); 855 // then print the requested information 856 if (printmethod) { 857 print_code(); 858 print_pcs(); 859 if (oop_maps()) { 860 oop_maps()->print(); 861 } 862 } 863 if (PrintDebugInfo) { 864 print_scopes(); 865 } 866 if (PrintRelocations) { 867 print_relocations(); 868 } 869 if (PrintDependencies) { 870 print_dependencies(); 871 } 872 if (PrintExceptionHandlers) { 873 print_handler_table(); 874 print_nul_chk_table(); 875 } 876 if (xtty != NULL) { 877 xtty->tail("print_nmethod"); 878 } 879 } 880 881 882 // Promote one word from an assembly-time handle to a live embedded oop. 883 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 884 if (handle == NULL || 885 // As a special case, IC oops are initialized to 1 or -1. 886 handle == (jobject) Universe::non_oop_word()) { 887 (*dest) = (oop) handle; 888 } else { 889 (*dest) = JNIHandles::resolve_non_null(handle); 890 } 891 } 892 893 894 // Have to have the same name because it's called by a template 895 void nmethod::copy_values(GrowableArray<jobject>* array) { 896 int length = array->length(); 897 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 898 oop* dest = oops_begin(); 899 for (int index = 0 ; index < length; index++) { 900 initialize_immediate_oop(&dest[index], array->at(index)); 901 } 902 903 // Now we can fix up all the oops in the code. We need to do this 904 // in the code because the assembler uses jobjects as placeholders. 905 // The code and relocations have already been initialized by the 906 // CodeBlob constructor, so it is valid even at this early point to 907 // iterate over relocations and patch the code. 908 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 909 } 910 911 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 912 int length = array->length(); 913 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 914 Metadata** dest = metadata_begin(); 915 for (int index = 0 ; index < length; index++) { 916 dest[index] = array->at(index); 917 } 918 } 919 920 bool nmethod::is_at_poll_return(address pc) { 921 RelocIterator iter(this, pc, pc+1); 922 while (iter.next()) { 923 if (iter.type() == relocInfo::poll_return_type) 924 return true; 925 } 926 return false; 927 } 928 929 930 bool nmethod::is_at_poll_or_poll_return(address pc) { 931 RelocIterator iter(this, pc, pc+1); 932 while (iter.next()) { 933 relocInfo::relocType t = iter.type(); 934 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 935 return true; 936 } 937 return false; 938 } 939 940 941 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 942 // re-patch all oop-bearing instructions, just in case some oops moved 943 RelocIterator iter(this, begin, end); 944 while (iter.next()) { 945 if (iter.type() == relocInfo::oop_type) { 946 oop_Relocation* reloc = iter.oop_reloc(); 947 if (initialize_immediates && reloc->oop_is_immediate()) { 948 oop* dest = reloc->oop_addr(); 949 initialize_immediate_oop(dest, (jobject) *dest); 950 } 951 // Refresh the oop-related bits of this instruction. 952 reloc->fix_oop_relocation(); 953 } else if (iter.type() == relocInfo::metadata_type) { 954 metadata_Relocation* reloc = iter.metadata_reloc(); 955 reloc->fix_metadata_relocation(); 956 } 957 } 958 } 959 960 961 void nmethod::verify_oop_relocations() { 962 // Ensure sure that the code matches the current oop values 963 RelocIterator iter(this, NULL, NULL); 964 while (iter.next()) { 965 if (iter.type() == relocInfo::oop_type) { 966 oop_Relocation* reloc = iter.oop_reloc(); 967 if (!reloc->oop_is_immediate()) { 968 reloc->verify_oop_relocation(); 969 } 970 } 971 } 972 } 973 974 975 ScopeDesc* nmethod::scope_desc_at(address pc) { 976 PcDesc* pd = pc_desc_at(pc); 977 guarantee(pd != NULL, "scope must be present"); 978 return new ScopeDesc(this, pd->scope_decode_offset(), 979 pd->obj_decode_offset(), pd->should_reexecute(), 980 pd->return_oop()); 981 } 982 983 984 void nmethod::clear_inline_caches() { 985 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 986 if (is_zombie()) { 987 return; 988 } 989 990 RelocIterator iter(this); 991 while (iter.next()) { 992 iter.reloc()->clear_inline_cache(); 993 } 994 } 995 996 // Clear ICStubs of all compiled ICs 997 void nmethod::clear_ic_stubs() { 998 assert_locked_or_safepoint(CompiledIC_lock); 999 RelocIterator iter(this); 1000 while(iter.next()) { 1001 if (iter.type() == relocInfo::virtual_call_type) { 1002 CompiledIC* ic = CompiledIC_at(&iter); 1003 ic->clear_ic_stub(); 1004 } 1005 } 1006 } 1007 1008 1009 void nmethod::cleanup_inline_caches() { 1010 assert_locked_or_safepoint(CompiledIC_lock); 1011 1012 // If the method is not entrant or zombie then a JMP is plastered over the 1013 // first few bytes. If an oop in the old code was there, that oop 1014 // should not get GC'd. Skip the first few bytes of oops on 1015 // not-entrant methods. 1016 address low_boundary = verified_entry_point(); 1017 if (!is_in_use()) { 1018 low_boundary += NativeJump::instruction_size; 1019 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1020 // This means that the low_boundary is going to be a little too high. 1021 // This shouldn't matter, since oops of non-entrant methods are never used. 1022 // In fact, why are we bothering to look at oops in a non-entrant method?? 1023 } 1024 1025 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1026 // zombie and unloaded nmethods. 1027 ResourceMark rm; 1028 RelocIterator iter(this, low_boundary); 1029 while(iter.next()) { 1030 switch(iter.type()) { 1031 case relocInfo::virtual_call_type: 1032 case relocInfo::opt_virtual_call_type: { 1033 CompiledIC *ic = CompiledIC_at(&iter); 1034 // Ok, to lookup references to zombies here 1035 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1036 if( cb != NULL && cb->is_nmethod() ) { 1037 nmethod* nm = (nmethod*)cb; 1038 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1039 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1040 } 1041 break; 1042 } 1043 case relocInfo::static_call_type: { 1044 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1045 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1046 if( cb != NULL && cb->is_nmethod() ) { 1047 nmethod* nm = (nmethod*)cb; 1048 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1049 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1050 } 1051 break; 1052 } 1053 } 1054 } 1055 } 1056 1057 void nmethod::verify_clean_inline_caches() { 1058 assert_locked_or_safepoint(CompiledIC_lock); 1059 1060 // If the method is not entrant or zombie then a JMP is plastered over the 1061 // first few bytes. If an oop in the old code was there, that oop 1062 // should not get GC'd. Skip the first few bytes of oops on 1063 // not-entrant methods. 1064 address low_boundary = verified_entry_point(); 1065 if (!is_in_use()) { 1066 low_boundary += NativeJump::instruction_size; 1067 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1068 // This means that the low_boundary is going to be a little too high. 1069 // This shouldn't matter, since oops of non-entrant methods are never used. 1070 // In fact, why are we bothering to look at oops in a non-entrant method?? 1071 } 1072 1073 ResourceMark rm; 1074 RelocIterator iter(this, low_boundary); 1075 while(iter.next()) { 1076 switch(iter.type()) { 1077 case relocInfo::virtual_call_type: 1078 case relocInfo::opt_virtual_call_type: { 1079 CompiledIC *ic = CompiledIC_at(&iter); 1080 // Ok, to lookup references to zombies here 1081 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1082 if( cb != NULL && cb->is_nmethod() ) { 1083 nmethod* nm = (nmethod*)cb; 1084 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1085 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1086 assert(ic->is_clean(), "IC should be clean"); 1087 } 1088 } 1089 break; 1090 } 1091 case relocInfo::static_call_type: { 1092 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1093 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1094 if( cb != NULL && cb->is_nmethod() ) { 1095 nmethod* nm = (nmethod*)cb; 1096 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1097 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1098 assert(csc->is_clean(), "IC should be clean"); 1099 } 1100 } 1101 break; 1102 } 1103 } 1104 } 1105 } 1106 1107 int nmethod::verify_icholder_relocations() { 1108 int count = 0; 1109 1110 RelocIterator iter(this); 1111 while(iter.next()) { 1112 if (iter.type() == relocInfo::virtual_call_type) { 1113 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1114 CompiledIC *ic = CompiledIC_at(&iter); 1115 if (TraceCompiledIC) { 1116 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1117 ic->print(); 1118 } 1119 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1120 count++; 1121 } 1122 } 1123 } 1124 1125 return count; 1126 } 1127 1128 // This is a private interface with the sweeper. 1129 void nmethod::mark_as_seen_on_stack() { 1130 assert(is_alive(), "Must be an alive method"); 1131 // Set the traversal mark to ensure that the sweeper does 2 1132 // cleaning passes before moving to zombie. 1133 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1134 } 1135 1136 // Tell if a non-entrant method can be converted to a zombie (i.e., 1137 // there are no activations on the stack, not in use by the VM, 1138 // and not in use by the ServiceThread) 1139 bool nmethod::can_convert_to_zombie() { 1140 assert(is_not_entrant(), "must be a non-entrant method"); 1141 1142 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1143 // count can be greater than the stack traversal count before it hits the 1144 // nmethod for the second time. 1145 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1146 !is_locked_by_vm(); 1147 } 1148 1149 void nmethod::inc_decompile_count() { 1150 if (!is_compiled_by_c2()) return; 1151 // Could be gated by ProfileTraps, but do not bother... 1152 Method* m = method(); 1153 if (m == NULL) return; 1154 MethodData* mdo = m->method_data(); 1155 if (mdo == NULL) return; 1156 // There is a benign race here. See comments in methodData.hpp. 1157 mdo->inc_decompile_count(); 1158 } 1159 1160 void nmethod::increase_unloading_clock() { 1161 _global_unloading_clock++; 1162 if (_global_unloading_clock == 0) { 1163 // _nmethods are allocated with _unloading_clock == 0, 1164 // so 0 is never used as a clock value. 1165 _global_unloading_clock = 1; 1166 } 1167 } 1168 1169 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1170 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1171 } 1172 1173 unsigned char nmethod::unloading_clock() { 1174 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1175 } 1176 1177 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1178 1179 post_compiled_method_unload(); 1180 1181 // Since this nmethod is being unloaded, make sure that dependencies 1182 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1183 // indicate that this work is being done during a GC. 1184 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1185 assert(is_alive != NULL, "Should be non-NULL"); 1186 // A non-NULL is_alive closure indicates that this is being called during GC. 1187 flush_dependencies(is_alive); 1188 1189 // Break cycle between nmethod & method 1190 if (TraceClassUnloading && WizardMode) { 1191 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1192 " unloadable], Method*(" INTPTR_FORMAT 1193 "), cause(" INTPTR_FORMAT ")", 1194 this, (address)_method, (address)cause); 1195 if (!Universe::heap()->is_gc_active()) 1196 cause->klass()->print(); 1197 } 1198 // Unlink the osr method, so we do not look this up again 1199 if (is_osr_method()) { 1200 invalidate_osr_method(); 1201 } 1202 // If _method is already NULL the Method* is about to be unloaded, 1203 // so we don't have to break the cycle. Note that it is possible to 1204 // have the Method* live here, in case we unload the nmethod because 1205 // it is pointing to some oop (other than the Method*) being unloaded. 1206 if (_method != NULL) { 1207 // OSR methods point to the Method*, but the Method* does not 1208 // point back! 1209 if (_method->code() == this) { 1210 _method->clear_code(); // Break a cycle 1211 } 1212 _method = NULL; // Clear the method of this dead nmethod 1213 } 1214 // Make the class unloaded - i.e., change state and notify sweeper 1215 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1216 if (is_in_use()) { 1217 // Transitioning directly from live to unloaded -- so 1218 // we need to force a cache clean-up; remember this 1219 // for later on. 1220 CodeCache::set_needs_cache_clean(true); 1221 } 1222 1223 // Unregister must be done before the state change 1224 Universe::heap()->unregister_nmethod(this); 1225 1226 _state = unloaded; 1227 1228 // Log the unloading. 1229 log_state_change(); 1230 1231 // The Method* is gone at this point 1232 assert(_method == NULL, "Tautology"); 1233 1234 set_osr_link(NULL); 1235 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1236 NMethodSweeper::report_state_change(this); 1237 } 1238 1239 void nmethod::invalidate_osr_method() { 1240 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1241 // Remove from list of active nmethods 1242 if (method() != NULL) 1243 method()->method_holder()->remove_osr_nmethod(this); 1244 } 1245 1246 void nmethod::log_state_change() const { 1247 if (LogCompilation) { 1248 if (xtty != NULL) { 1249 ttyLocker ttyl; // keep the following output all in one block 1250 if (_state == unloaded) { 1251 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1252 os::current_thread_id()); 1253 } else { 1254 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1255 os::current_thread_id(), 1256 (_state == zombie ? " zombie='1'" : "")); 1257 } 1258 log_identity(xtty); 1259 xtty->stamp(); 1260 xtty->end_elem(); 1261 } 1262 } 1263 if (PrintCompilation && _state != unloaded) { 1264 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1265 } 1266 } 1267 1268 /** 1269 * Common functionality for both make_not_entrant and make_zombie 1270 */ 1271 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1272 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1273 assert(!is_zombie(), "should not already be a zombie"); 1274 1275 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1276 nmethodLocker nml(this); 1277 methodHandle the_method(method()); 1278 No_Safepoint_Verifier nsv; 1279 1280 // during patching, depending on the nmethod state we must notify the GC that 1281 // code has been unloaded, unregistering it. We cannot do this right while 1282 // holding the Patching_lock because we need to use the CodeCache_lock. This 1283 // would be prone to deadlocks. 1284 // This flag is used to remember whether we need to later lock and unregister. 1285 bool nmethod_needs_unregister = false; 1286 1287 { 1288 // invalidate osr nmethod before acquiring the patching lock since 1289 // they both acquire leaf locks and we don't want a deadlock. 1290 // This logic is equivalent to the logic below for patching the 1291 // verified entry point of regular methods. 1292 if (is_osr_method()) { 1293 // this effectively makes the osr nmethod not entrant 1294 invalidate_osr_method(); 1295 } 1296 1297 // Enter critical section. Does not block for safepoint. 1298 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1299 1300 if (_state == state) { 1301 // another thread already performed this transition so nothing 1302 // to do, but return false to indicate this. 1303 return false; 1304 } 1305 1306 // The caller can be calling the method statically or through an inline 1307 // cache call. 1308 if (!is_osr_method() && !is_not_entrant()) { 1309 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1310 SharedRuntime::get_handle_wrong_method_stub()); 1311 } 1312 1313 if (is_in_use()) { 1314 // It's a true state change, so mark the method as decompiled. 1315 // Do it only for transition from alive. 1316 inc_decompile_count(); 1317 } 1318 1319 // If the state is becoming a zombie, signal to unregister the nmethod with 1320 // the heap. 1321 // This nmethod may have already been unloaded during a full GC. 1322 if ((state == zombie) && !is_unloaded()) { 1323 nmethod_needs_unregister = true; 1324 } 1325 1326 // Must happen before state change. Otherwise we have a race condition in 1327 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1328 // transition its state from 'not_entrant' to 'zombie' without having to wait 1329 // for stack scanning. 1330 if (state == not_entrant) { 1331 mark_as_seen_on_stack(); 1332 OrderAccess::storestore(); 1333 } 1334 1335 // Change state 1336 _state = state; 1337 1338 // Log the transition once 1339 log_state_change(); 1340 1341 // Remove nmethod from method. 1342 // We need to check if both the _code and _from_compiled_code_entry_point 1343 // refer to this nmethod because there is a race in setting these two fields 1344 // in Method* as seen in bugid 4947125. 1345 // If the vep() points to the zombie nmethod, the memory for the nmethod 1346 // could be flushed and the compiler and vtable stubs could still call 1347 // through it. 1348 if (method() != NULL && (method()->code() == this || 1349 method()->from_compiled_entry() == verified_entry_point())) { 1350 HandleMark hm; 1351 method()->clear_code(); 1352 } 1353 } // leave critical region under Patching_lock 1354 1355 // When the nmethod becomes zombie it is no longer alive so the 1356 // dependencies must be flushed. nmethods in the not_entrant 1357 // state will be flushed later when the transition to zombie 1358 // happens or they get unloaded. 1359 if (state == zombie) { 1360 { 1361 // Flushing dependecies must be done before any possible 1362 // safepoint can sneak in, otherwise the oops used by the 1363 // dependency logic could have become stale. 1364 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1365 if (nmethod_needs_unregister) { 1366 Universe::heap()->unregister_nmethod(this); 1367 } 1368 flush_dependencies(NULL); 1369 } 1370 1371 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1372 // event and it hasn't already been reported for this nmethod then 1373 // report it now. The event may have been reported earilier if the GC 1374 // marked it for unloading). JvmtiDeferredEventQueue support means 1375 // we no longer go to a safepoint here. 1376 post_compiled_method_unload(); 1377 1378 #ifdef ASSERT 1379 // It's no longer safe to access the oops section since zombie 1380 // nmethods aren't scanned for GC. 1381 _oops_are_stale = true; 1382 #endif 1383 // the Method may be reclaimed by class unloading now that the 1384 // nmethod is in zombie state 1385 set_method(NULL); 1386 } else { 1387 assert(state == not_entrant, "other cases may need to be handled differently"); 1388 } 1389 1390 if (TraceCreateZombies) { 1391 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1392 } 1393 1394 NMethodSweeper::report_state_change(this); 1395 return true; 1396 } 1397 1398 void nmethod::flush() { 1399 // Note that there are no valid oops in the nmethod anymore. 1400 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1401 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1402 1403 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1404 assert_locked_or_safepoint(CodeCache_lock); 1405 1406 // completely deallocate this method 1407 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1408 if (PrintMethodFlushing) { 1409 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1410 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1411 } 1412 1413 // We need to deallocate any ExceptionCache data. 1414 // Note that we do not need to grab the nmethod lock for this, it 1415 // better be thread safe if we're disposing of it! 1416 ExceptionCache* ec = exception_cache(); 1417 set_exception_cache(NULL); 1418 while(ec != NULL) { 1419 ExceptionCache* next = ec->next(); 1420 delete ec; 1421 ec = next; 1422 } 1423 1424 if (on_scavenge_root_list()) { 1425 CodeCache::drop_scavenge_root_nmethod(this); 1426 } 1427 1428 #ifdef SHARK 1429 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1430 #endif // SHARK 1431 1432 ((CodeBlob*)(this))->flush(); 1433 1434 CodeCache::free(this); 1435 } 1436 1437 // 1438 // Notify all classes this nmethod is dependent on that it is no 1439 // longer dependent. This should only be called in two situations. 1440 // First, when a nmethod transitions to a zombie all dependents need 1441 // to be clear. Since zombification happens at a safepoint there's no 1442 // synchronization issues. The second place is a little more tricky. 1443 // During phase 1 of mark sweep class unloading may happen and as a 1444 // result some nmethods may get unloaded. In this case the flushing 1445 // of dependencies must happen during phase 1 since after GC any 1446 // dependencies in the unloaded nmethod won't be updated, so 1447 // traversing the dependency information in unsafe. In that case this 1448 // function is called with a non-NULL argument and this function only 1449 // notifies instanceKlasses that are reachable 1450 1451 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1452 assert_locked_or_safepoint(CodeCache_lock); 1453 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1454 "is_alive is non-NULL if and only if we are called during GC"); 1455 if (!has_flushed_dependencies()) { 1456 set_has_flushed_dependencies(); 1457 for (Dependencies::DepStream deps(this); deps.next(); ) { 1458 if (deps.type() == Dependencies::call_site_target_value) { 1459 // CallSite dependencies are managed on per-CallSite instance basis. 1460 oop call_site = deps.argument_oop(0); 1461 MethodHandles::remove_dependent_nmethod(call_site, this); 1462 } else { 1463 Klass* klass = deps.context_type(); 1464 if (klass == NULL) { 1465 continue; // ignore things like evol_method 1466 } 1467 // During GC the is_alive closure is non-NULL, and is used to 1468 // determine liveness of dependees that need to be updated. 1469 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1470 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1471 } 1472 } 1473 } 1474 } 1475 } 1476 1477 1478 // If this oop is not live, the nmethod can be unloaded. 1479 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1480 assert(root != NULL, "just checking"); 1481 oop obj = *root; 1482 if (obj == NULL || is_alive->do_object_b(obj)) { 1483 return false; 1484 } 1485 1486 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1487 // simply because one of its constant oops has gone dead. 1488 // No actual classes need to be unloaded in order for this to occur. 1489 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1490 make_unloaded(is_alive, obj); 1491 return true; 1492 } 1493 1494 // ------------------------------------------------------------------ 1495 // post_compiled_method_load_event 1496 // new method for install_code() path 1497 // Transfer information from compilation to jvmti 1498 void nmethod::post_compiled_method_load_event() { 1499 1500 Method* moop = method(); 1501 HOTSPOT_COMPILED_METHOD_LOAD( 1502 (char *) moop->klass_name()->bytes(), 1503 moop->klass_name()->utf8_length(), 1504 (char *) moop->name()->bytes(), 1505 moop->name()->utf8_length(), 1506 (char *) moop->signature()->bytes(), 1507 moop->signature()->utf8_length(), 1508 insts_begin(), insts_size()); 1509 1510 if (JvmtiExport::should_post_compiled_method_load() || 1511 JvmtiExport::should_post_compiled_method_unload()) { 1512 get_and_cache_jmethod_id(); 1513 } 1514 1515 if (JvmtiExport::should_post_compiled_method_load()) { 1516 // Let the Service thread (which is a real Java thread) post the event 1517 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1518 JvmtiDeferredEventQueue::enqueue( 1519 JvmtiDeferredEvent::compiled_method_load_event(this)); 1520 } 1521 } 1522 1523 jmethodID nmethod::get_and_cache_jmethod_id() { 1524 if (_jmethod_id == NULL) { 1525 // Cache the jmethod_id since it can no longer be looked up once the 1526 // method itself has been marked for unloading. 1527 _jmethod_id = method()->jmethod_id(); 1528 } 1529 return _jmethod_id; 1530 } 1531 1532 void nmethod::post_compiled_method_unload() { 1533 if (unload_reported()) { 1534 // During unloading we transition to unloaded and then to zombie 1535 // and the unloading is reported during the first transition. 1536 return; 1537 } 1538 1539 assert(_method != NULL && !is_unloaded(), "just checking"); 1540 DTRACE_METHOD_UNLOAD_PROBE(method()); 1541 1542 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1543 // post the event. Sometime later this nmethod will be made a zombie 1544 // by the sweeper but the Method* will not be valid at that point. 1545 // If the _jmethod_id is null then no load event was ever requested 1546 // so don't bother posting the unload. The main reason for this is 1547 // that the jmethodID is a weak reference to the Method* so if 1548 // it's being unloaded there's no way to look it up since the weak 1549 // ref will have been cleared. 1550 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1551 assert(!unload_reported(), "already unloaded"); 1552 JvmtiDeferredEvent event = 1553 JvmtiDeferredEvent::compiled_method_unload_event(this, 1554 _jmethod_id, insts_begin()); 1555 if (SafepointSynchronize::is_at_safepoint()) { 1556 // Don't want to take the queueing lock. Add it as pending and 1557 // it will get enqueued later. 1558 JvmtiDeferredEventQueue::add_pending_event(event); 1559 } else { 1560 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1561 JvmtiDeferredEventQueue::enqueue(event); 1562 } 1563 } 1564 1565 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1566 // any time. As the nmethod is being unloaded now we mark it has 1567 // having the unload event reported - this will ensure that we don't 1568 // attempt to report the event in the unlikely scenario where the 1569 // event is enabled at the time the nmethod is made a zombie. 1570 set_unload_reported(); 1571 } 1572 1573 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1574 if (ic->is_icholder_call()) { 1575 // The only exception is compiledICHolder oops which may 1576 // yet be marked below. (We check this further below). 1577 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1578 1579 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1580 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1581 return; 1582 } 1583 } else { 1584 Metadata* ic_oop = ic->cached_metadata(); 1585 if (ic_oop != NULL) { 1586 if (ic_oop->is_klass()) { 1587 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1588 return; 1589 } 1590 } else if (ic_oop->is_method()) { 1591 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1592 return; 1593 } 1594 } else { 1595 ShouldNotReachHere(); 1596 } 1597 } 1598 } 1599 1600 ic->set_to_clean(); 1601 } 1602 1603 // This is called at the end of the strong tracing/marking phase of a 1604 // GC to unload an nmethod if it contains otherwise unreachable 1605 // oops. 1606 1607 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1608 // Make sure the oop's ready to receive visitors 1609 assert(!is_zombie() && !is_unloaded(), 1610 "should not call follow on zombie or unloaded nmethod"); 1611 1612 // If the method is not entrant then a JMP is plastered over the 1613 // first few bytes. If an oop in the old code was there, that oop 1614 // should not get GC'd. Skip the first few bytes of oops on 1615 // not-entrant methods. 1616 address low_boundary = verified_entry_point(); 1617 if (is_not_entrant()) { 1618 low_boundary += NativeJump::instruction_size; 1619 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1620 // (See comment above.) 1621 } 1622 1623 // The RedefineClasses() API can cause the class unloading invariant 1624 // to no longer be true. See jvmtiExport.hpp for details. 1625 // Also, leave a debugging breadcrumb in local flag. 1626 if (JvmtiExport::has_redefined_a_class()) { 1627 // This set of the unloading_occurred flag is done before the 1628 // call to post_compiled_method_unload() so that the unloading 1629 // of this nmethod is reported. 1630 unloading_occurred = true; 1631 } 1632 1633 // Exception cache 1634 clean_exception_cache(is_alive); 1635 1636 // If class unloading occurred we first iterate over all inline caches and 1637 // clear ICs where the cached oop is referring to an unloaded klass or method. 1638 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1639 // iteration below. 1640 if (unloading_occurred) { 1641 RelocIterator iter(this, low_boundary); 1642 while(iter.next()) { 1643 if (iter.type() == relocInfo::virtual_call_type) { 1644 CompiledIC *ic = CompiledIC_at(&iter); 1645 clean_ic_if_metadata_is_dead(ic, is_alive); 1646 } 1647 } 1648 } 1649 1650 // Compiled code 1651 { 1652 RelocIterator iter(this, low_boundary); 1653 while (iter.next()) { 1654 if (iter.type() == relocInfo::oop_type) { 1655 oop_Relocation* r = iter.oop_reloc(); 1656 // In this loop, we must only traverse those oops directly embedded in 1657 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1658 assert(1 == (r->oop_is_immediate()) + 1659 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1660 "oop must be found in exactly one place"); 1661 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1662 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1663 return; 1664 } 1665 } 1666 } 1667 } 1668 } 1669 1670 1671 // Scopes 1672 for (oop* p = oops_begin(); p < oops_end(); p++) { 1673 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1674 if (can_unload(is_alive, p, unloading_occurred)) { 1675 return; 1676 } 1677 } 1678 1679 // Ensure that all metadata is still alive 1680 verify_metadata_loaders(low_boundary, is_alive); 1681 } 1682 1683 template <class CompiledICorStaticCall> 1684 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1685 // Ok, to lookup references to zombies here 1686 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1687 if (cb != NULL && cb->is_nmethod()) { 1688 nmethod* nm = (nmethod*)cb; 1689 1690 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1691 // The nmethod has not been processed yet. 1692 return true; 1693 } 1694 1695 // Clean inline caches pointing to both zombie and not_entrant methods 1696 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1697 ic->set_to_clean(); 1698 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1699 } 1700 } 1701 1702 return false; 1703 } 1704 1705 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1706 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1707 } 1708 1709 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1710 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1711 } 1712 1713 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1714 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1715 1716 oop_Relocation* r = iter_at_oop->oop_reloc(); 1717 // Traverse those oops directly embedded in the code. 1718 // Other oops (oop_index>0) are seen as part of scopes_oops. 1719 assert(1 == (r->oop_is_immediate()) + 1720 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1721 "oop must be found in exactly one place"); 1722 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1723 // Unload this nmethod if the oop is dead. 1724 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1725 return true;; 1726 } 1727 } 1728 1729 return false; 1730 } 1731 1732 1733 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1734 ResourceMark rm; 1735 1736 // Make sure the oop's ready to receive visitors 1737 assert(!is_zombie() && !is_unloaded(), 1738 "should not call follow on zombie or unloaded nmethod"); 1739 1740 // If the method is not entrant then a JMP is plastered over the 1741 // first few bytes. If an oop in the old code was there, that oop 1742 // should not get GC'd. Skip the first few bytes of oops on 1743 // not-entrant methods. 1744 address low_boundary = verified_entry_point(); 1745 if (is_not_entrant()) { 1746 low_boundary += NativeJump::instruction_size; 1747 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1748 // (See comment above.) 1749 } 1750 1751 // The RedefineClasses() API can cause the class unloading invariant 1752 // to no longer be true. See jvmtiExport.hpp for details. 1753 // Also, leave a debugging breadcrumb in local flag. 1754 if (JvmtiExport::has_redefined_a_class()) { 1755 // This set of the unloading_occurred flag is done before the 1756 // call to post_compiled_method_unload() so that the unloading 1757 // of this nmethod is reported. 1758 unloading_occurred = true; 1759 } 1760 1761 // Exception cache 1762 clean_exception_cache(is_alive); 1763 1764 bool is_unloaded = false; 1765 bool postponed = false; 1766 1767 RelocIterator iter(this, low_boundary); 1768 while(iter.next()) { 1769 1770 switch (iter.type()) { 1771 1772 case relocInfo::virtual_call_type: 1773 if (unloading_occurred) { 1774 // If class unloading occurred we first iterate over all inline caches and 1775 // clear ICs where the cached oop is referring to an unloaded klass or method. 1776 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1777 } 1778 1779 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1780 break; 1781 1782 case relocInfo::opt_virtual_call_type: 1783 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1784 break; 1785 1786 case relocInfo::static_call_type: 1787 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1788 break; 1789 1790 case relocInfo::oop_type: 1791 if (!is_unloaded) { 1792 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 1793 } 1794 break; 1795 1796 case relocInfo::metadata_type: 1797 break; // nothing to do. 1798 } 1799 } 1800 1801 if (is_unloaded) { 1802 return postponed; 1803 } 1804 1805 // Scopes 1806 for (oop* p = oops_begin(); p < oops_end(); p++) { 1807 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1808 if (can_unload(is_alive, p, unloading_occurred)) { 1809 is_unloaded = true; 1810 break; 1811 } 1812 } 1813 1814 if (is_unloaded) { 1815 return postponed; 1816 } 1817 1818 // Ensure that all metadata is still alive 1819 verify_metadata_loaders(low_boundary, is_alive); 1820 1821 return postponed; 1822 } 1823 1824 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 1825 ResourceMark rm; 1826 1827 // Make sure the oop's ready to receive visitors 1828 assert(!is_zombie(), 1829 "should not call follow on zombie nmethod"); 1830 1831 // If the method is not entrant then a JMP is plastered over the 1832 // first few bytes. If an oop in the old code was there, that oop 1833 // should not get GC'd. Skip the first few bytes of oops on 1834 // not-entrant methods. 1835 address low_boundary = verified_entry_point(); 1836 if (is_not_entrant()) { 1837 low_boundary += NativeJump::instruction_size; 1838 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1839 // (See comment above.) 1840 } 1841 1842 RelocIterator iter(this, low_boundary); 1843 while(iter.next()) { 1844 1845 switch (iter.type()) { 1846 1847 case relocInfo::virtual_call_type: 1848 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1849 break; 1850 1851 case relocInfo::opt_virtual_call_type: 1852 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1853 break; 1854 1855 case relocInfo::static_call_type: 1856 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1857 break; 1858 } 1859 } 1860 } 1861 1862 #ifdef ASSERT 1863 1864 class CheckClass : AllStatic { 1865 static BoolObjectClosure* _is_alive; 1866 1867 // Check class_loader is alive for this bit of metadata. 1868 static void check_class(Metadata* md) { 1869 Klass* klass = NULL; 1870 if (md->is_klass()) { 1871 klass = ((Klass*)md); 1872 } else if (md->is_method()) { 1873 klass = ((Method*)md)->method_holder(); 1874 } else if (md->is_methodData()) { 1875 klass = ((MethodData*)md)->method()->method_holder(); 1876 } else { 1877 md->print(); 1878 ShouldNotReachHere(); 1879 } 1880 assert(klass->is_loader_alive(_is_alive), "must be alive"); 1881 } 1882 public: 1883 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 1884 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 1885 _is_alive = is_alive; 1886 nm->metadata_do(check_class); 1887 } 1888 }; 1889 1890 // This is called during a safepoint so can use static data 1891 BoolObjectClosure* CheckClass::_is_alive = NULL; 1892 #endif // ASSERT 1893 1894 1895 // Processing of oop references should have been sufficient to keep 1896 // all strong references alive. Any weak references should have been 1897 // cleared as well. Visit all the metadata and ensure that it's 1898 // really alive. 1899 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 1900 #ifdef ASSERT 1901 RelocIterator iter(this, low_boundary); 1902 while (iter.next()) { 1903 // static_stub_Relocations may have dangling references to 1904 // Method*s so trim them out here. Otherwise it looks like 1905 // compiled code is maintaining a link to dead metadata. 1906 address static_call_addr = NULL; 1907 if (iter.type() == relocInfo::opt_virtual_call_type) { 1908 CompiledIC* cic = CompiledIC_at(&iter); 1909 if (!cic->is_call_to_interpreted()) { 1910 static_call_addr = iter.addr(); 1911 } 1912 } else if (iter.type() == relocInfo::static_call_type) { 1913 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 1914 if (!csc->is_call_to_interpreted()) { 1915 static_call_addr = iter.addr(); 1916 } 1917 } 1918 if (static_call_addr != NULL) { 1919 RelocIterator sciter(this, low_boundary); 1920 while (sciter.next()) { 1921 if (sciter.type() == relocInfo::static_stub_type && 1922 sciter.static_stub_reloc()->static_call() == static_call_addr) { 1923 sciter.static_stub_reloc()->clear_inline_cache(); 1924 } 1925 } 1926 } 1927 } 1928 // Check that the metadata embedded in the nmethod is alive 1929 CheckClass::do_check_class(is_alive, this); 1930 #endif 1931 } 1932 1933 1934 // Iterate over metadata calling this function. Used by RedefineClasses 1935 void nmethod::metadata_do(void f(Metadata*)) { 1936 address low_boundary = verified_entry_point(); 1937 if (is_not_entrant()) { 1938 low_boundary += NativeJump::instruction_size; 1939 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1940 // (See comment above.) 1941 } 1942 { 1943 // Visit all immediate references that are embedded in the instruction stream. 1944 RelocIterator iter(this, low_boundary); 1945 while (iter.next()) { 1946 if (iter.type() == relocInfo::metadata_type ) { 1947 metadata_Relocation* r = iter.metadata_reloc(); 1948 // In this metadata, we must only follow those metadatas directly embedded in 1949 // the code. Other metadatas (oop_index>0) are seen as part of 1950 // the metadata section below. 1951 assert(1 == (r->metadata_is_immediate()) + 1952 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1953 "metadata must be found in exactly one place"); 1954 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1955 Metadata* md = r->metadata_value(); 1956 if (md != _method) f(md); 1957 } 1958 } else if (iter.type() == relocInfo::virtual_call_type) { 1959 // Check compiledIC holders associated with this nmethod 1960 CompiledIC *ic = CompiledIC_at(&iter); 1961 if (ic->is_icholder_call()) { 1962 CompiledICHolder* cichk = ic->cached_icholder(); 1963 f(cichk->holder_method()); 1964 f(cichk->holder_klass()); 1965 } else { 1966 Metadata* ic_oop = ic->cached_metadata(); 1967 if (ic_oop != NULL) { 1968 f(ic_oop); 1969 } 1970 } 1971 } 1972 } 1973 } 1974 1975 // Visit the metadata section 1976 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1977 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1978 Metadata* md = *p; 1979 f(md); 1980 } 1981 1982 // Visit metadata not embedded in the other places. 1983 if (_method != NULL) f(_method); 1984 } 1985 1986 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1987 // make sure the oops ready to receive visitors 1988 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1989 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1990 1991 // If the method is not entrant or zombie then a JMP is plastered over the 1992 // first few bytes. If an oop in the old code was there, that oop 1993 // should not get GC'd. Skip the first few bytes of oops on 1994 // not-entrant methods. 1995 address low_boundary = verified_entry_point(); 1996 if (is_not_entrant()) { 1997 low_boundary += NativeJump::instruction_size; 1998 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1999 // (See comment above.) 2000 } 2001 2002 RelocIterator iter(this, low_boundary); 2003 2004 while (iter.next()) { 2005 if (iter.type() == relocInfo::oop_type ) { 2006 oop_Relocation* r = iter.oop_reloc(); 2007 // In this loop, we must only follow those oops directly embedded in 2008 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2009 assert(1 == (r->oop_is_immediate()) + 2010 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2011 "oop must be found in exactly one place"); 2012 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2013 f->do_oop(r->oop_addr()); 2014 } 2015 } 2016 } 2017 2018 // Scopes 2019 // This includes oop constants not inlined in the code stream. 2020 for (oop* p = oops_begin(); p < oops_end(); p++) { 2021 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2022 f->do_oop(p); 2023 } 2024 } 2025 2026 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2027 2028 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2029 2030 // An nmethod is "marked" if its _mark_link is set non-null. 2031 // Even if it is the end of the linked list, it will have a non-null link value, 2032 // as long as it is on the list. 2033 // This code must be MP safe, because it is used from parallel GC passes. 2034 bool nmethod::test_set_oops_do_mark() { 2035 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2036 nmethod* observed_mark_link = _oops_do_mark_link; 2037 if (observed_mark_link == NULL) { 2038 // Claim this nmethod for this thread to mark. 2039 observed_mark_link = (nmethod*) 2040 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2041 if (observed_mark_link == NULL) { 2042 2043 // Atomically append this nmethod (now claimed) to the head of the list: 2044 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2045 for (;;) { 2046 nmethod* required_mark_nmethods = observed_mark_nmethods; 2047 _oops_do_mark_link = required_mark_nmethods; 2048 observed_mark_nmethods = (nmethod*) 2049 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2050 if (observed_mark_nmethods == required_mark_nmethods) 2051 break; 2052 } 2053 // Mark was clear when we first saw this guy. 2054 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2055 return false; 2056 } 2057 } 2058 // On fall through, another racing thread marked this nmethod before we did. 2059 return true; 2060 } 2061 2062 void nmethod::oops_do_marking_prologue() { 2063 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2064 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2065 // We use cmpxchg_ptr instead of regular assignment here because the user 2066 // may fork a bunch of threads, and we need them all to see the same state. 2067 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2068 guarantee(observed == NULL, "no races in this sequential code"); 2069 } 2070 2071 void nmethod::oops_do_marking_epilogue() { 2072 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2073 nmethod* cur = _oops_do_mark_nmethods; 2074 while (cur != NMETHOD_SENTINEL) { 2075 assert(cur != NULL, "not NULL-terminated"); 2076 nmethod* next = cur->_oops_do_mark_link; 2077 cur->_oops_do_mark_link = NULL; 2078 cur->verify_oop_relocations(); 2079 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2080 cur = next; 2081 } 2082 void* required = _oops_do_mark_nmethods; 2083 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2084 guarantee(observed == required, "no races in this sequential code"); 2085 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2086 } 2087 2088 class DetectScavengeRoot: public OopClosure { 2089 bool _detected_scavenge_root; 2090 public: 2091 DetectScavengeRoot() : _detected_scavenge_root(false) 2092 { NOT_PRODUCT(_print_nm = NULL); } 2093 bool detected_scavenge_root() { return _detected_scavenge_root; } 2094 virtual void do_oop(oop* p) { 2095 if ((*p) != NULL && (*p)->is_scavengable()) { 2096 NOT_PRODUCT(maybe_print(p)); 2097 _detected_scavenge_root = true; 2098 } 2099 } 2100 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2101 2102 #ifndef PRODUCT 2103 nmethod* _print_nm; 2104 void maybe_print(oop* p) { 2105 if (_print_nm == NULL) return; 2106 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2107 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2108 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2109 (void *)(*p), (intptr_t)p); 2110 (*p)->print(); 2111 } 2112 #endif //PRODUCT 2113 }; 2114 2115 bool nmethod::detect_scavenge_root_oops() { 2116 DetectScavengeRoot detect_scavenge_root; 2117 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2118 oops_do(&detect_scavenge_root); 2119 return detect_scavenge_root.detected_scavenge_root(); 2120 } 2121 2122 // Method that knows how to preserve outgoing arguments at call. This method must be 2123 // called with a frame corresponding to a Java invoke 2124 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2125 #ifndef SHARK 2126 if (!method()->is_native()) { 2127 SimpleScopeDesc ssd(this, fr.pc()); 2128 Bytecode_invoke call(ssd.method(), ssd.bci()); 2129 bool has_receiver = call.has_receiver(); 2130 bool has_appendix = call.has_appendix(); 2131 Symbol* signature = call.signature(); 2132 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2133 } 2134 #endif // !SHARK 2135 } 2136 2137 inline bool includes(void* p, void* from, void* to) { 2138 return from <= p && p < to; 2139 } 2140 2141 2142 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2143 assert(count >= 2, "must be sentinel values, at least"); 2144 2145 #ifdef ASSERT 2146 // must be sorted and unique; we do a binary search in find_pc_desc() 2147 int prev_offset = pcs[0].pc_offset(); 2148 assert(prev_offset == PcDesc::lower_offset_limit, 2149 "must start with a sentinel"); 2150 for (int i = 1; i < count; i++) { 2151 int this_offset = pcs[i].pc_offset(); 2152 assert(this_offset > prev_offset, "offsets must be sorted"); 2153 prev_offset = this_offset; 2154 } 2155 assert(prev_offset == PcDesc::upper_offset_limit, 2156 "must end with a sentinel"); 2157 #endif //ASSERT 2158 2159 // Search for MethodHandle invokes and tag the nmethod. 2160 for (int i = 0; i < count; i++) { 2161 if (pcs[i].is_method_handle_invoke()) { 2162 set_has_method_handle_invokes(true); 2163 break; 2164 } 2165 } 2166 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2167 2168 int size = count * sizeof(PcDesc); 2169 assert(scopes_pcs_size() >= size, "oob"); 2170 memcpy(scopes_pcs_begin(), pcs, size); 2171 2172 // Adjust the final sentinel downward. 2173 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2174 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2175 last_pc->set_pc_offset(content_size() + 1); 2176 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2177 // Fill any rounding gaps with copies of the last record. 2178 last_pc[1] = last_pc[0]; 2179 } 2180 // The following assert could fail if sizeof(PcDesc) is not 2181 // an integral multiple of oopSize (the rounding term). 2182 // If it fails, change the logic to always allocate a multiple 2183 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2184 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2185 } 2186 2187 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2188 assert(scopes_data_size() >= size, "oob"); 2189 memcpy(scopes_data_begin(), buffer, size); 2190 } 2191 2192 2193 #ifdef ASSERT 2194 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2195 PcDesc* lower = nm->scopes_pcs_begin(); 2196 PcDesc* upper = nm->scopes_pcs_end(); 2197 lower += 1; // exclude initial sentinel 2198 PcDesc* res = NULL; 2199 for (PcDesc* p = lower; p < upper; p++) { 2200 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2201 if (match_desc(p, pc_offset, approximate)) { 2202 if (res == NULL) 2203 res = p; 2204 else 2205 res = (PcDesc*) badAddress; 2206 } 2207 } 2208 return res; 2209 } 2210 #endif 2211 2212 2213 // Finds a PcDesc with real-pc equal to "pc" 2214 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2215 address base_address = code_begin(); 2216 if ((pc < base_address) || 2217 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2218 return NULL; // PC is wildly out of range 2219 } 2220 int pc_offset = (int) (pc - base_address); 2221 2222 // Check the PcDesc cache if it contains the desired PcDesc 2223 // (This as an almost 100% hit rate.) 2224 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2225 if (res != NULL) { 2226 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2227 return res; 2228 } 2229 2230 // Fallback algorithm: quasi-linear search for the PcDesc 2231 // Find the last pc_offset less than the given offset. 2232 // The successor must be the required match, if there is a match at all. 2233 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2234 PcDesc* lower = scopes_pcs_begin(); 2235 PcDesc* upper = scopes_pcs_end(); 2236 upper -= 1; // exclude final sentinel 2237 if (lower >= upper) return NULL; // native method; no PcDescs at all 2238 2239 #define assert_LU_OK \ 2240 /* invariant on lower..upper during the following search: */ \ 2241 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2242 assert(upper->pc_offset() >= pc_offset, "sanity") 2243 assert_LU_OK; 2244 2245 // Use the last successful return as a split point. 2246 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2247 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2248 if (mid->pc_offset() < pc_offset) { 2249 lower = mid; 2250 } else { 2251 upper = mid; 2252 } 2253 2254 // Take giant steps at first (4096, then 256, then 16, then 1) 2255 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2256 const int RADIX = (1 << LOG2_RADIX); 2257 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2258 while ((mid = lower + step) < upper) { 2259 assert_LU_OK; 2260 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2261 if (mid->pc_offset() < pc_offset) { 2262 lower = mid; 2263 } else { 2264 upper = mid; 2265 break; 2266 } 2267 } 2268 assert_LU_OK; 2269 } 2270 2271 // Sneak up on the value with a linear search of length ~16. 2272 while (true) { 2273 assert_LU_OK; 2274 mid = lower + 1; 2275 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2276 if (mid->pc_offset() < pc_offset) { 2277 lower = mid; 2278 } else { 2279 upper = mid; 2280 break; 2281 } 2282 } 2283 #undef assert_LU_OK 2284 2285 if (match_desc(upper, pc_offset, approximate)) { 2286 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2287 _pc_desc_cache.add_pc_desc(upper); 2288 return upper; 2289 } else { 2290 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2291 return NULL; 2292 } 2293 } 2294 2295 2296 void nmethod::check_all_dependencies(DepChange& changes) { 2297 // Checked dependencies are allocated into this ResourceMark 2298 ResourceMark rm; 2299 2300 // Turn off dependency tracing while actually testing dependencies. 2301 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2302 2303 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2304 &DependencySignature::equals, 11027> DepTable; 2305 2306 DepTable* table = new DepTable(); 2307 2308 // Iterate over live nmethods and check dependencies of all nmethods that are not 2309 // marked for deoptimization. A particular dependency is only checked once. 2310 NMethodIterator iter; 2311 while(iter.next()) { 2312 nmethod* nm = iter.method(); 2313 // Only notify for live nmethods 2314 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2315 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2316 // Construct abstraction of a dependency. 2317 DependencySignature* current_sig = new DependencySignature(deps); 2318 2319 // Determine if dependency is already checked. table->put(...) returns 2320 // 'true' if the dependency is added (i.e., was not in the hashtable). 2321 if (table->put(*current_sig, 1)) { 2322 if (deps.check_dependency() != NULL) { 2323 // Dependency checking failed. Print out information about the failed 2324 // dependency and finally fail with an assert. We can fail here, since 2325 // dependency checking is never done in a product build. 2326 tty->print_cr("Failed dependency:"); 2327 changes.print(); 2328 nm->print(); 2329 nm->print_dependencies(); 2330 assert(false, "Should have been marked for deoptimization"); 2331 } 2332 } 2333 } 2334 } 2335 } 2336 } 2337 2338 bool nmethod::check_dependency_on(DepChange& changes) { 2339 // What has happened: 2340 // 1) a new class dependee has been added 2341 // 2) dependee and all its super classes have been marked 2342 bool found_check = false; // set true if we are upset 2343 for (Dependencies::DepStream deps(this); deps.next(); ) { 2344 // Evaluate only relevant dependencies. 2345 if (deps.spot_check_dependency_at(changes) != NULL) { 2346 found_check = true; 2347 NOT_DEBUG(break); 2348 } 2349 } 2350 return found_check; 2351 } 2352 2353 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2354 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2355 Array<Method*>* dependee_methods = dependee_ik->methods(); 2356 for (Dependencies::DepStream deps(this); deps.next(); ) { 2357 if (deps.type() == Dependencies::evol_method) { 2358 Method* method = deps.method_argument(0); 2359 for (int j = 0; j < dependee_methods->length(); j++) { 2360 if (dependee_methods->at(j) == method) { 2361 // RC_TRACE macro has an embedded ResourceMark 2362 RC_TRACE(0x01000000, 2363 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2364 _method->method_holder()->external_name(), 2365 _method->name()->as_C_string(), 2366 _method->signature()->as_C_string(), compile_id(), 2367 method->method_holder()->external_name(), 2368 method->name()->as_C_string(), 2369 method->signature()->as_C_string())); 2370 if (TraceDependencies || LogCompilation) 2371 deps.log_dependency(dependee); 2372 return true; 2373 } 2374 } 2375 } 2376 } 2377 return false; 2378 } 2379 2380 // Called from mark_for_deoptimization, when dependee is invalidated. 2381 bool nmethod::is_dependent_on_method(Method* dependee) { 2382 for (Dependencies::DepStream deps(this); deps.next(); ) { 2383 if (deps.type() != Dependencies::evol_method) 2384 continue; 2385 Method* method = deps.method_argument(0); 2386 if (method == dependee) return true; 2387 } 2388 return false; 2389 } 2390 2391 2392 bool nmethod::is_patchable_at(address instr_addr) { 2393 assert(insts_contains(instr_addr), "wrong nmethod used"); 2394 if (is_zombie()) { 2395 // a zombie may never be patched 2396 return false; 2397 } 2398 return true; 2399 } 2400 2401 2402 address nmethod::continuation_for_implicit_exception(address pc) { 2403 // Exception happened outside inline-cache check code => we are inside 2404 // an active nmethod => use cpc to determine a return address 2405 int exception_offset = pc - code_begin(); 2406 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2407 #ifdef ASSERT 2408 if (cont_offset == 0) { 2409 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2410 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2411 HandleMark hm(thread); 2412 ResourceMark rm(thread); 2413 CodeBlob* cb = CodeCache::find_blob(pc); 2414 assert(cb != NULL && cb == this, ""); 2415 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2416 print(); 2417 method()->print_codes(); 2418 print_code(); 2419 print_pcs(); 2420 } 2421 #endif 2422 if (cont_offset == 0) { 2423 // Let the normal error handling report the exception 2424 return NULL; 2425 } 2426 return code_begin() + cont_offset; 2427 } 2428 2429 2430 2431 void nmethod_init() { 2432 // make sure you didn't forget to adjust the filler fields 2433 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2434 } 2435 2436 2437 //------------------------------------------------------------------------------------------- 2438 2439 2440 // QQQ might we make this work from a frame?? 2441 nmethodLocker::nmethodLocker(address pc) { 2442 CodeBlob* cb = CodeCache::find_blob(pc); 2443 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2444 _nm = (nmethod*)cb; 2445 lock_nmethod(_nm); 2446 } 2447 2448 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2449 // should pass zombie_ok == true. 2450 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2451 if (nm == NULL) return; 2452 Atomic::inc(&nm->_lock_count); 2453 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2454 } 2455 2456 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2457 if (nm == NULL) return; 2458 Atomic::dec(&nm->_lock_count); 2459 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2460 } 2461 2462 2463 // ----------------------------------------------------------------------------- 2464 // nmethod::get_deopt_original_pc 2465 // 2466 // Return the original PC for the given PC if: 2467 // (a) the given PC belongs to a nmethod and 2468 // (b) it is a deopt PC 2469 address nmethod::get_deopt_original_pc(const frame* fr) { 2470 if (fr->cb() == NULL) return NULL; 2471 2472 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2473 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2474 return nm->get_original_pc(fr); 2475 2476 return NULL; 2477 } 2478 2479 2480 // ----------------------------------------------------------------------------- 2481 // MethodHandle 2482 2483 bool nmethod::is_method_handle_return(address return_pc) { 2484 if (!has_method_handle_invokes()) return false; 2485 PcDesc* pd = pc_desc_at(return_pc); 2486 if (pd == NULL) 2487 return false; 2488 return pd->is_method_handle_invoke(); 2489 } 2490 2491 2492 // ----------------------------------------------------------------------------- 2493 // Verification 2494 2495 class VerifyOopsClosure: public OopClosure { 2496 nmethod* _nm; 2497 bool _ok; 2498 public: 2499 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2500 bool ok() { return _ok; } 2501 virtual void do_oop(oop* p) { 2502 if ((*p) == NULL || (*p)->is_oop()) return; 2503 if (_ok) { 2504 _nm->print_nmethod(true); 2505 _ok = false; 2506 } 2507 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2508 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2509 } 2510 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2511 }; 2512 2513 void nmethod::verify() { 2514 2515 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2516 // seems odd. 2517 2518 if (is_zombie() || is_not_entrant() || is_unloaded()) 2519 return; 2520 2521 // Make sure all the entry points are correctly aligned for patching. 2522 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2523 2524 // assert(method()->is_oop(), "must be valid"); 2525 2526 ResourceMark rm; 2527 2528 if (!CodeCache::contains(this)) { 2529 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2530 } 2531 2532 if(is_native_method() ) 2533 return; 2534 2535 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2536 if (nm != this) { 2537 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2538 this)); 2539 } 2540 2541 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2542 if (! p->verify(this)) { 2543 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2544 } 2545 } 2546 2547 VerifyOopsClosure voc(this); 2548 oops_do(&voc); 2549 assert(voc.ok(), "embedded oops must be OK"); 2550 verify_scavenge_root_oops(); 2551 2552 verify_scopes(); 2553 } 2554 2555 2556 void nmethod::verify_interrupt_point(address call_site) { 2557 // Verify IC only when nmethod installation is finished. 2558 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2559 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2560 if (is_installed) { 2561 Thread *cur = Thread::current(); 2562 if (CompiledIC_lock->owner() == cur || 2563 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2564 SafepointSynchronize::is_at_safepoint())) { 2565 CompiledIC_at(this, call_site); 2566 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2567 } else { 2568 MutexLocker ml_verify (CompiledIC_lock); 2569 CompiledIC_at(this, call_site); 2570 } 2571 } 2572 2573 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2574 assert(pd != NULL, "PcDesc must exist"); 2575 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2576 pd->obj_decode_offset(), pd->should_reexecute(), 2577 pd->return_oop()); 2578 !sd->is_top(); sd = sd->sender()) { 2579 sd->verify(); 2580 } 2581 } 2582 2583 void nmethod::verify_scopes() { 2584 if( !method() ) return; // Runtime stubs have no scope 2585 if (method()->is_native()) return; // Ignore stub methods. 2586 // iterate through all interrupt point 2587 // and verify the debug information is valid. 2588 RelocIterator iter((nmethod*)this); 2589 while (iter.next()) { 2590 address stub = NULL; 2591 switch (iter.type()) { 2592 case relocInfo::virtual_call_type: 2593 verify_interrupt_point(iter.addr()); 2594 break; 2595 case relocInfo::opt_virtual_call_type: 2596 stub = iter.opt_virtual_call_reloc()->static_stub(); 2597 verify_interrupt_point(iter.addr()); 2598 break; 2599 case relocInfo::static_call_type: 2600 stub = iter.static_call_reloc()->static_stub(); 2601 //verify_interrupt_point(iter.addr()); 2602 break; 2603 case relocInfo::runtime_call_type: 2604 address destination = iter.reloc()->value(); 2605 // Right now there is no way to find out which entries support 2606 // an interrupt point. It would be nice if we had this 2607 // information in a table. 2608 break; 2609 } 2610 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2611 } 2612 } 2613 2614 2615 // ----------------------------------------------------------------------------- 2616 // Non-product code 2617 #ifndef PRODUCT 2618 2619 class DebugScavengeRoot: public OopClosure { 2620 nmethod* _nm; 2621 bool _ok; 2622 public: 2623 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2624 bool ok() { return _ok; } 2625 virtual void do_oop(oop* p) { 2626 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2627 if (_ok) { 2628 _nm->print_nmethod(true); 2629 _ok = false; 2630 } 2631 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2632 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2633 (*p)->print(); 2634 } 2635 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2636 }; 2637 2638 void nmethod::verify_scavenge_root_oops() { 2639 if (UseG1GC) { 2640 return; 2641 } 2642 2643 if (!on_scavenge_root_list()) { 2644 // Actually look inside, to verify the claim that it's clean. 2645 DebugScavengeRoot debug_scavenge_root(this); 2646 oops_do(&debug_scavenge_root); 2647 if (!debug_scavenge_root.ok()) 2648 fatal("found an unadvertised bad scavengable oop in the code cache"); 2649 } 2650 assert(scavenge_root_not_marked(), ""); 2651 } 2652 2653 #endif // PRODUCT 2654 2655 // Printing operations 2656 2657 void nmethod::print() const { 2658 ResourceMark rm; 2659 ttyLocker ttyl; // keep the following output all in one block 2660 2661 tty->print("Compiled method "); 2662 2663 if (is_compiled_by_c1()) { 2664 tty->print("(c1) "); 2665 } else if (is_compiled_by_c2()) { 2666 tty->print("(c2) "); 2667 } else if (is_compiled_by_shark()) { 2668 tty->print("(shark) "); 2669 } else { 2670 tty->print("(nm) "); 2671 } 2672 2673 print_on(tty, NULL); 2674 2675 if (WizardMode) { 2676 tty->print("((nmethod*) " INTPTR_FORMAT ") ", this); 2677 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2678 tty->print(" { "); 2679 if (is_in_use()) tty->print("in_use "); 2680 if (is_not_entrant()) tty->print("not_entrant "); 2681 if (is_zombie()) tty->print("zombie "); 2682 if (is_unloaded()) tty->print("unloaded "); 2683 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2684 tty->print_cr("}:"); 2685 } 2686 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2687 (address)this, 2688 (address)this + size(), 2689 size()); 2690 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2691 relocation_begin(), 2692 relocation_end(), 2693 relocation_size()); 2694 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2695 consts_begin(), 2696 consts_end(), 2697 consts_size()); 2698 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2699 insts_begin(), 2700 insts_end(), 2701 insts_size()); 2702 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2703 stub_begin(), 2704 stub_end(), 2705 stub_size()); 2706 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2707 oops_begin(), 2708 oops_end(), 2709 oops_size()); 2710 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2711 metadata_begin(), 2712 metadata_end(), 2713 metadata_size()); 2714 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2715 scopes_data_begin(), 2716 scopes_data_end(), 2717 scopes_data_size()); 2718 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2719 scopes_pcs_begin(), 2720 scopes_pcs_end(), 2721 scopes_pcs_size()); 2722 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2723 dependencies_begin(), 2724 dependencies_end(), 2725 dependencies_size()); 2726 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2727 handler_table_begin(), 2728 handler_table_end(), 2729 handler_table_size()); 2730 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2731 nul_chk_table_begin(), 2732 nul_chk_table_end(), 2733 nul_chk_table_size()); 2734 } 2735 2736 void nmethod::print_code() { 2737 HandleMark hm; 2738 ResourceMark m; 2739 Disassembler::decode(this); 2740 } 2741 2742 2743 #ifndef PRODUCT 2744 2745 void nmethod::print_scopes() { 2746 // Find the first pc desc for all scopes in the code and print it. 2747 ResourceMark rm; 2748 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2749 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2750 continue; 2751 2752 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2753 sd->print_on(tty, p); 2754 } 2755 } 2756 2757 void nmethod::print_dependencies() { 2758 ResourceMark rm; 2759 ttyLocker ttyl; // keep the following output all in one block 2760 tty->print_cr("Dependencies:"); 2761 for (Dependencies::DepStream deps(this); deps.next(); ) { 2762 deps.print_dependency(); 2763 Klass* ctxk = deps.context_type(); 2764 if (ctxk != NULL) { 2765 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2766 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2767 } 2768 } 2769 deps.log_dependency(); // put it into the xml log also 2770 } 2771 } 2772 2773 2774 void nmethod::print_relocations() { 2775 ResourceMark m; // in case methods get printed via the debugger 2776 tty->print_cr("relocations:"); 2777 RelocIterator iter(this); 2778 iter.print(); 2779 if (UseRelocIndex) { 2780 jint* index_end = (jint*)relocation_end() - 1; 2781 jint index_size = *index_end; 2782 jint* index_start = (jint*)( (address)index_end - index_size ); 2783 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2784 if (index_size > 0) { 2785 jint* ip; 2786 for (ip = index_start; ip+2 <= index_end; ip += 2) 2787 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2788 ip[0], 2789 ip[1], 2790 header_end()+ip[0], 2791 relocation_begin()-1+ip[1]); 2792 for (; ip < index_end; ip++) 2793 tty->print_cr(" (%d ?)", ip[0]); 2794 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2795 ip++; 2796 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2797 } 2798 } 2799 } 2800 2801 2802 void nmethod::print_pcs() { 2803 ResourceMark m; // in case methods get printed via debugger 2804 tty->print_cr("pc-bytecode offsets:"); 2805 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2806 p->print(this); 2807 } 2808 } 2809 2810 #endif // PRODUCT 2811 2812 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2813 RelocIterator iter(this, begin, end); 2814 bool have_one = false; 2815 while (iter.next()) { 2816 have_one = true; 2817 switch (iter.type()) { 2818 case relocInfo::none: return "no_reloc"; 2819 case relocInfo::oop_type: { 2820 stringStream st; 2821 oop_Relocation* r = iter.oop_reloc(); 2822 oop obj = r->oop_value(); 2823 st.print("oop("); 2824 if (obj == NULL) st.print("NULL"); 2825 else obj->print_value_on(&st); 2826 st.print(")"); 2827 return st.as_string(); 2828 } 2829 case relocInfo::metadata_type: { 2830 stringStream st; 2831 metadata_Relocation* r = iter.metadata_reloc(); 2832 Metadata* obj = r->metadata_value(); 2833 st.print("metadata("); 2834 if (obj == NULL) st.print("NULL"); 2835 else obj->print_value_on(&st); 2836 st.print(")"); 2837 return st.as_string(); 2838 } 2839 case relocInfo::runtime_call_type: { 2840 stringStream st; 2841 st.print("runtime_call"); 2842 runtime_call_Relocation* r = iter.runtime_call_reloc(); 2843 address dest = r->destination(); 2844 CodeBlob* cb = CodeCache::find_blob(dest); 2845 if (cb != NULL) { 2846 st.print(" %s", cb->name()); 2847 } 2848 return st.as_string(); 2849 } 2850 case relocInfo::virtual_call_type: return "virtual_call"; 2851 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2852 case relocInfo::static_call_type: return "static_call"; 2853 case relocInfo::static_stub_type: return "static_stub"; 2854 case relocInfo::external_word_type: return "external_word"; 2855 case relocInfo::internal_word_type: return "internal_word"; 2856 case relocInfo::section_word_type: return "section_word"; 2857 case relocInfo::poll_type: return "poll"; 2858 case relocInfo::poll_return_type: return "poll_return"; 2859 case relocInfo::type_mask: return "type_bit_mask"; 2860 } 2861 } 2862 return have_one ? "other" : NULL; 2863 } 2864 2865 // Return a the last scope in (begin..end] 2866 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2867 PcDesc* p = pc_desc_near(begin+1); 2868 if (p != NULL && p->real_pc(this) <= end) { 2869 return new ScopeDesc(this, p->scope_decode_offset(), 2870 p->obj_decode_offset(), p->should_reexecute(), 2871 p->return_oop()); 2872 } 2873 return NULL; 2874 } 2875 2876 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2877 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2878 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2879 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2880 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2881 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2882 2883 if (has_method_handle_invokes()) 2884 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2885 2886 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2887 2888 if (block_begin == entry_point()) { 2889 methodHandle m = method(); 2890 if (m.not_null()) { 2891 stream->print(" # "); 2892 m->print_value_on(stream); 2893 stream->cr(); 2894 } 2895 if (m.not_null() && !is_osr_method()) { 2896 ResourceMark rm; 2897 int sizeargs = m->size_of_parameters(); 2898 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2899 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2900 { 2901 int sig_index = 0; 2902 if (!m->is_static()) 2903 sig_bt[sig_index++] = T_OBJECT; // 'this' 2904 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2905 BasicType t = ss.type(); 2906 sig_bt[sig_index++] = t; 2907 if (type2size[t] == 2) { 2908 sig_bt[sig_index++] = T_VOID; 2909 } else { 2910 assert(type2size[t] == 1, "size is 1 or 2"); 2911 } 2912 } 2913 assert(sig_index == sizeargs, ""); 2914 } 2915 const char* spname = "sp"; // make arch-specific? 2916 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2917 int stack_slot_offset = this->frame_size() * wordSize; 2918 int tab1 = 14, tab2 = 24; 2919 int sig_index = 0; 2920 int arg_index = (m->is_static() ? 0 : -1); 2921 bool did_old_sp = false; 2922 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2923 bool at_this = (arg_index == -1); 2924 bool at_old_sp = false; 2925 BasicType t = (at_this ? T_OBJECT : ss.type()); 2926 assert(t == sig_bt[sig_index], "sigs in sync"); 2927 if (at_this) 2928 stream->print(" # this: "); 2929 else 2930 stream->print(" # parm%d: ", arg_index); 2931 stream->move_to(tab1); 2932 VMReg fst = regs[sig_index].first(); 2933 VMReg snd = regs[sig_index].second(); 2934 if (fst->is_reg()) { 2935 stream->print("%s", fst->name()); 2936 if (snd->is_valid()) { 2937 stream->print(":%s", snd->name()); 2938 } 2939 } else if (fst->is_stack()) { 2940 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2941 if (offset == stack_slot_offset) at_old_sp = true; 2942 stream->print("[%s+0x%x]", spname, offset); 2943 } else { 2944 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2945 } 2946 stream->print(" "); 2947 stream->move_to(tab2); 2948 stream->print("= "); 2949 if (at_this) { 2950 m->method_holder()->print_value_on(stream); 2951 } else { 2952 bool did_name = false; 2953 if (!at_this && ss.is_object()) { 2954 Symbol* name = ss.as_symbol_or_null(); 2955 if (name != NULL) { 2956 name->print_value_on(stream); 2957 did_name = true; 2958 } 2959 } 2960 if (!did_name) 2961 stream->print("%s", type2name(t)); 2962 } 2963 if (at_old_sp) { 2964 stream->print(" (%s of caller)", spname); 2965 did_old_sp = true; 2966 } 2967 stream->cr(); 2968 sig_index += type2size[t]; 2969 arg_index += 1; 2970 if (!at_this) ss.next(); 2971 } 2972 if (!did_old_sp) { 2973 stream->print(" # "); 2974 stream->move_to(tab1); 2975 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2976 stream->print(" (%s of caller)", spname); 2977 stream->cr(); 2978 } 2979 } 2980 } 2981 } 2982 2983 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2984 // First, find an oopmap in (begin, end]. 2985 // We use the odd half-closed interval so that oop maps and scope descs 2986 // which are tied to the byte after a call are printed with the call itself. 2987 address base = code_begin(); 2988 ImmutableOopMapSet* oms = oop_maps(); 2989 if (oms != NULL) { 2990 for (int i = 0, imax = oms->count(); i < imax; i++) { 2991 const ImmutableOopMapPair* pair = oms->pair_at(i); 2992 const ImmutableOopMap* om = pair->get_from(oms); 2993 address pc = base + pair->pc_offset(); 2994 if (pc > begin) { 2995 if (pc <= end) { 2996 st->move_to(column); 2997 st->print("; "); 2998 om->print_on(st); 2999 } 3000 break; 3001 } 3002 } 3003 } 3004 3005 // Print any debug info present at this pc. 3006 ScopeDesc* sd = scope_desc_in(begin, end); 3007 if (sd != NULL) { 3008 st->move_to(column); 3009 if (sd->bci() == SynchronizationEntryBCI) { 3010 st->print(";*synchronization entry"); 3011 } else { 3012 if (sd->method() == NULL) { 3013 st->print("method is NULL"); 3014 } else if (sd->method()->is_native()) { 3015 st->print("method is native"); 3016 } else { 3017 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3018 st->print(";*%s", Bytecodes::name(bc)); 3019 switch (bc) { 3020 case Bytecodes::_invokevirtual: 3021 case Bytecodes::_invokespecial: 3022 case Bytecodes::_invokestatic: 3023 case Bytecodes::_invokeinterface: 3024 { 3025 Bytecode_invoke invoke(sd->method(), sd->bci()); 3026 st->print(" "); 3027 if (invoke.name() != NULL) 3028 invoke.name()->print_symbol_on(st); 3029 else 3030 st->print("<UNKNOWN>"); 3031 break; 3032 } 3033 case Bytecodes::_getfield: 3034 case Bytecodes::_putfield: 3035 case Bytecodes::_getstatic: 3036 case Bytecodes::_putstatic: 3037 { 3038 Bytecode_field field(sd->method(), sd->bci()); 3039 st->print(" "); 3040 if (field.name() != NULL) 3041 field.name()->print_symbol_on(st); 3042 else 3043 st->print("<UNKNOWN>"); 3044 } 3045 } 3046 } 3047 } 3048 3049 // Print all scopes 3050 for (;sd != NULL; sd = sd->sender()) { 3051 st->move_to(column); 3052 st->print("; -"); 3053 if (sd->method() == NULL) { 3054 st->print("method is NULL"); 3055 } else { 3056 sd->method()->print_short_name(st); 3057 } 3058 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3059 if (lineno != -1) { 3060 st->print("@%d (line %d)", sd->bci(), lineno); 3061 } else { 3062 st->print("@%d", sd->bci()); 3063 } 3064 st->cr(); 3065 } 3066 } 3067 3068 // Print relocation information 3069 const char* str = reloc_string_for(begin, end); 3070 if (str != NULL) { 3071 if (sd != NULL) st->cr(); 3072 st->move_to(column); 3073 st->print("; {%s}", str); 3074 } 3075 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3076 if (cont_offset != 0) { 3077 st->move_to(column); 3078 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3079 } 3080 3081 } 3082 3083 #ifndef PRODUCT 3084 3085 void nmethod::print_value_on(outputStream* st) const { 3086 st->print("nmethod"); 3087 print_on(st, NULL); 3088 } 3089 3090 void nmethod::print_calls(outputStream* st) { 3091 RelocIterator iter(this); 3092 while (iter.next()) { 3093 switch (iter.type()) { 3094 case relocInfo::virtual_call_type: 3095 case relocInfo::opt_virtual_call_type: { 3096 VerifyMutexLocker mc(CompiledIC_lock); 3097 CompiledIC_at(&iter)->print(); 3098 break; 3099 } 3100 case relocInfo::static_call_type: 3101 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3102 compiledStaticCall_at(iter.reloc())->print(); 3103 break; 3104 } 3105 } 3106 } 3107 3108 void nmethod::print_handler_table() { 3109 ExceptionHandlerTable(this).print(); 3110 } 3111 3112 void nmethod::print_nul_chk_table() { 3113 ImplicitExceptionTable(this).print(code_begin()); 3114 } 3115 3116 void nmethod::print_statistics() { 3117 ttyLocker ttyl; 3118 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3119 nmethod_stats.print_native_nmethod_stats(); 3120 nmethod_stats.print_nmethod_stats(); 3121 DebugInformationRecorder::print_statistics(); 3122 nmethod_stats.print_pc_stats(); 3123 Dependencies::print_statistics(); 3124 if (xtty != NULL) xtty->tail("statistics"); 3125 } 3126 3127 #endif // PRODUCT