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