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