1 /* 2 * Copyright (c) 1997, 2016, 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/nativeInst.hpp" 30 #include "code/nmethod.hpp" 31 #include "code/scopeDesc.hpp" 32 #include "compiler/abstractCompiler.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "compiler/compileLog.hpp" 35 #include "compiler/compilerDirectives.hpp" 36 #include "compiler/directivesParser.hpp" 37 #include "compiler/disassembler.hpp" 38 #include "interpreter/bytecode.hpp" 39 #include "oops/methodData.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiRedefineClassesTrace.hpp" 42 #include "prims/jvmtiImpl.hpp" 43 #include "runtime/atomic.inline.hpp" 44 #include "runtime/orderAccess.inline.hpp" 45 #include "runtime/os.hpp" 46 #include "runtime/sharedRuntime.hpp" 47 #include "runtime/sweeper.hpp" 48 #include "utilities/resourceHash.hpp" 49 #include "utilities/dtrace.hpp" 50 #include "utilities/events.hpp" 51 #include "utilities/xmlstream.hpp" 52 #include "logging/log.hpp" 53 #ifdef TARGET_ARCH_x86 54 # include "nativeInst_x86.hpp" 55 #endif 56 #ifdef TARGET_ARCH_sparc 57 # include "nativeInst_sparc.hpp" 58 #endif 59 #ifdef TARGET_ARCH_zero 60 # include "nativeInst_zero.hpp" 61 #endif 62 #ifdef TARGET_ARCH_arm 63 # include "nativeInst_arm.hpp" 64 #endif 65 #ifdef TARGET_ARCH_ppc 66 # include "nativeInst_ppc.hpp" 67 #endif 68 #ifdef SHARK 69 #include "shark/sharkCompiler.hpp" 70 #endif 71 #if INCLUDE_JVMCI 72 #include "jvmci/jvmciJavaClasses.hpp" 73 #endif 74 75 unsigned char nmethod::_global_unloading_clock = 0; 76 77 #ifdef DTRACE_ENABLED 78 79 // Only bother with this argument setup if dtrace is available 80 81 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 82 { \ 83 Method* m = (method); \ 84 if (m != NULL) { \ 85 Symbol* klass_name = m->klass_name(); \ 86 Symbol* name = m->name(); \ 87 Symbol* signature = m->signature(); \ 88 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 89 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 90 (char *) name->bytes(), name->utf8_length(), \ 91 (char *) signature->bytes(), signature->utf8_length()); \ 92 } \ 93 } 94 95 #else // ndef DTRACE_ENABLED 96 97 #define DTRACE_METHOD_UNLOAD_PROBE(method) 98 99 #endif 100 101 bool nmethod::is_compiled_by_c1() const { 102 if (compiler() == NULL) { 103 return false; 104 } 105 return compiler()->is_c1(); 106 } 107 bool nmethod::is_compiled_by_jvmci() const { 108 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 109 if (is_native_method()) return false; 110 return compiler()->is_jvmci(); 111 } 112 bool nmethod::is_compiled_by_c2() const { 113 if (compiler() == NULL) { 114 return false; 115 } 116 return compiler()->is_c2(); 117 } 118 bool nmethod::is_compiled_by_shark() const { 119 if (compiler() == NULL) { 120 return false; 121 } 122 return compiler()->is_shark(); 123 } 124 125 126 127 //--------------------------------------------------------------------------------- 128 // NMethod statistics 129 // They are printed under various flags, including: 130 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 131 // (In the latter two cases, they like other stats are printed to the log only.) 132 133 #ifndef PRODUCT 134 // These variables are put into one block to reduce relocations 135 // and make it simpler to print from the debugger. 136 struct java_nmethod_stats_struct { 137 int nmethod_count; 138 int total_size; 139 int relocation_size; 140 int consts_size; 141 int insts_size; 142 int stub_size; 143 int scopes_data_size; 144 int scopes_pcs_size; 145 int dependencies_size; 146 int handler_table_size; 147 int nul_chk_table_size; 148 int oops_size; 149 int metadata_size; 150 151 void note_nmethod(nmethod* nm) { 152 nmethod_count += 1; 153 total_size += nm->size(); 154 relocation_size += nm->relocation_size(); 155 consts_size += nm->consts_size(); 156 insts_size += nm->insts_size(); 157 stub_size += nm->stub_size(); 158 oops_size += nm->oops_size(); 159 metadata_size += nm->metadata_size(); 160 scopes_data_size += nm->scopes_data_size(); 161 scopes_pcs_size += nm->scopes_pcs_size(); 162 dependencies_size += nm->dependencies_size(); 163 handler_table_size += nm->handler_table_size(); 164 nul_chk_table_size += nm->nul_chk_table_size(); 165 } 166 void print_nmethod_stats(const char* name) { 167 if (nmethod_count == 0) return; 168 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 169 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 170 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 171 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 172 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 173 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 174 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 175 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 176 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 177 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 178 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 179 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 180 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 181 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 182 } 183 }; 184 185 struct native_nmethod_stats_struct { 186 int native_nmethod_count; 187 int native_total_size; 188 int native_relocation_size; 189 int native_insts_size; 190 int native_oops_size; 191 int native_metadata_size; 192 void note_native_nmethod(nmethod* nm) { 193 native_nmethod_count += 1; 194 native_total_size += nm->size(); 195 native_relocation_size += nm->relocation_size(); 196 native_insts_size += nm->insts_size(); 197 native_oops_size += nm->oops_size(); 198 native_metadata_size += nm->metadata_size(); 199 } 200 void print_native_nmethod_stats() { 201 if (native_nmethod_count == 0) return; 202 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 203 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 204 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 205 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 206 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 207 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 208 } 209 }; 210 211 struct pc_nmethod_stats_struct { 212 int pc_desc_resets; // number of resets (= number of caches) 213 int pc_desc_queries; // queries to nmethod::find_pc_desc 214 int pc_desc_approx; // number of those which have approximate true 215 int pc_desc_repeats; // number of _pc_descs[0] hits 216 int pc_desc_hits; // number of LRU cache hits 217 int pc_desc_tests; // total number of PcDesc examinations 218 int pc_desc_searches; // total number of quasi-binary search steps 219 int pc_desc_adds; // number of LUR cache insertions 220 221 void print_pc_stats() { 222 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 223 pc_desc_queries, 224 (double)(pc_desc_tests + pc_desc_searches) 225 / pc_desc_queries); 226 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 227 pc_desc_resets, 228 pc_desc_queries, pc_desc_approx, 229 pc_desc_repeats, pc_desc_hits, 230 pc_desc_tests, pc_desc_searches, pc_desc_adds); 231 } 232 }; 233 234 #ifdef COMPILER1 235 static java_nmethod_stats_struct c1_java_nmethod_stats; 236 #endif 237 #ifdef COMPILER2 238 static java_nmethod_stats_struct c2_java_nmethod_stats; 239 #endif 240 #if INCLUDE_JVMCI 241 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 242 #endif 243 #ifdef SHARK 244 static java_nmethod_stats_struct shark_java_nmethod_stats; 245 #endif 246 static java_nmethod_stats_struct unknown_java_nmethod_stats; 247 248 static native_nmethod_stats_struct native_nmethod_stats; 249 static pc_nmethod_stats_struct pc_nmethod_stats; 250 251 static void note_java_nmethod(nmethod* nm) { 252 #ifdef COMPILER1 253 if (nm->is_compiled_by_c1()) { 254 c1_java_nmethod_stats.note_nmethod(nm); 255 } else 256 #endif 257 #ifdef COMPILER2 258 if (nm->is_compiled_by_c2()) { 259 c2_java_nmethod_stats.note_nmethod(nm); 260 } else 261 #endif 262 #if INCLUDE_JVMCI 263 if (nm->is_compiled_by_jvmci()) { 264 jvmci_java_nmethod_stats.note_nmethod(nm); 265 } else 266 #endif 267 #ifdef SHARK 268 if (nm->is_compiled_by_shark()) { 269 shark_java_nmethod_stats.note_nmethod(nm); 270 } else 271 #endif 272 { 273 unknown_java_nmethod_stats.note_nmethod(nm); 274 } 275 } 276 #endif // !PRODUCT 277 278 //--------------------------------------------------------------------------------- 279 280 281 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 282 assert(pc != NULL, "Must be non null"); 283 assert(exception.not_null(), "Must be non null"); 284 assert(handler != NULL, "Must be non null"); 285 286 _count = 0; 287 _exception_type = exception->klass(); 288 _next = NULL; 289 290 add_address_and_handler(pc,handler); 291 } 292 293 294 address ExceptionCache::match(Handle exception, address pc) { 295 assert(pc != NULL,"Must be non null"); 296 assert(exception.not_null(),"Must be non null"); 297 if (exception->klass() == exception_type()) { 298 return (test_address(pc)); 299 } 300 301 return NULL; 302 } 303 304 305 bool ExceptionCache::match_exception_with_space(Handle exception) { 306 assert(exception.not_null(),"Must be non null"); 307 if (exception->klass() == exception_type() && count() < cache_size) { 308 return true; 309 } 310 return false; 311 } 312 313 314 address ExceptionCache::test_address(address addr) { 315 for (int i=0; i<count(); i++) { 316 if (pc_at(i) == addr) { 317 return handler_at(i); 318 } 319 } 320 return NULL; 321 } 322 323 324 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 325 if (test_address(addr) == handler) return true; 326 327 int index = count(); 328 if (index < cache_size) { 329 set_pc_at(index, addr); 330 set_handler_at(index, handler); 331 OrderAccess::storestore(); 332 increment_count(); 333 return true; 334 } 335 return false; 336 } 337 338 339 // private method for handling exception cache 340 // These methods are private, and used to manipulate the exception cache 341 // directly. 342 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 343 ExceptionCache* ec = exception_cache(); 344 while (ec != NULL) { 345 if (ec->match_exception_with_space(exception)) { 346 return ec; 347 } 348 ec = ec->next(); 349 } 350 return NULL; 351 } 352 353 354 //----------------------------------------------------------------------------- 355 356 357 // Helper used by both find_pc_desc methods. 358 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 359 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 360 if (!approximate) 361 return pc->pc_offset() == pc_offset; 362 else 363 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 364 } 365 366 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 367 if (initial_pc_desc == NULL) { 368 _pc_descs[0] = NULL; // native method; no PcDescs at all 369 return; 370 } 371 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 372 // reset the cache by filling it with benign (non-null) values 373 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 374 for (int i = 0; i < cache_size; i++) 375 _pc_descs[i] = initial_pc_desc; 376 } 377 378 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 379 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 380 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 381 382 // Note: one might think that caching the most recently 383 // read value separately would be a win, but one would be 384 // wrong. When many threads are updating it, the cache 385 // line it's in would bounce between caches, negating 386 // any benefit. 387 388 // In order to prevent race conditions do not load cache elements 389 // repeatedly, but use a local copy: 390 PcDesc* res; 391 392 // Step one: Check the most recently added value. 393 res = _pc_descs[0]; 394 if (res == NULL) return NULL; // native method; no PcDescs at all 395 if (match_desc(res, pc_offset, approximate)) { 396 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 397 return res; 398 } 399 400 // Step two: Check the rest of the LRU cache. 401 for (int i = 1; i < cache_size; ++i) { 402 res = _pc_descs[i]; 403 if (res->pc_offset() < 0) break; // optimization: skip empty cache 404 if (match_desc(res, pc_offset, approximate)) { 405 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 406 return res; 407 } 408 } 409 410 // Report failure. 411 return NULL; 412 } 413 414 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 415 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 416 // Update the LRU cache by shifting pc_desc forward. 417 for (int i = 0; i < cache_size; i++) { 418 PcDesc* next = _pc_descs[i]; 419 _pc_descs[i] = pc_desc; 420 pc_desc = next; 421 } 422 } 423 424 // adjust pcs_size so that it is a multiple of both oopSize and 425 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 426 // of oopSize, then 2*sizeof(PcDesc) is) 427 static int adjust_pcs_size(int pcs_size) { 428 int nsize = round_to(pcs_size, oopSize); 429 if ((nsize % sizeof(PcDesc)) != 0) { 430 nsize = pcs_size + sizeof(PcDesc); 431 } 432 assert((nsize % oopSize) == 0, "correct alignment"); 433 return nsize; 434 } 435 436 //----------------------------------------------------------------------------- 437 438 439 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 440 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 441 assert(new_entry != NULL,"Must be non null"); 442 assert(new_entry->next() == NULL, "Must be null"); 443 444 if (exception_cache() != NULL) { 445 new_entry->set_next(exception_cache()); 446 } 447 set_exception_cache(new_entry); 448 } 449 450 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 451 ExceptionCache* prev = NULL; 452 ExceptionCache* curr = exception_cache(); 453 454 while (curr != NULL) { 455 ExceptionCache* next = curr->next(); 456 457 Klass* ex_klass = curr->exception_type(); 458 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 459 if (prev == NULL) { 460 set_exception_cache(next); 461 } else { 462 prev->set_next(next); 463 } 464 delete curr; 465 // prev stays the same. 466 } else { 467 prev = curr; 468 } 469 470 curr = next; 471 } 472 } 473 474 // public method for accessing the exception cache 475 // These are the public access methods. 476 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 477 // We never grab a lock to read the exception cache, so we may 478 // have false negatives. This is okay, as it can only happen during 479 // the first few exception lookups for a given nmethod. 480 ExceptionCache* ec = exception_cache(); 481 while (ec != NULL) { 482 address ret_val; 483 if ((ret_val = ec->match(exception,pc)) != NULL) { 484 return ret_val; 485 } 486 ec = ec->next(); 487 } 488 return NULL; 489 } 490 491 492 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 493 // There are potential race conditions during exception cache updates, so we 494 // must own the ExceptionCache_lock before doing ANY modifications. Because 495 // we don't lock during reads, it is possible to have several threads attempt 496 // to update the cache with the same data. We need to check for already inserted 497 // copies of the current data before adding it. 498 499 MutexLocker ml(ExceptionCache_lock); 500 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 501 502 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 503 target_entry = new ExceptionCache(exception,pc,handler); 504 add_exception_cache_entry(target_entry); 505 } 506 } 507 508 509 //-------------end of code for ExceptionCache-------------- 510 511 512 int nmethod::total_size() const { 513 return 514 consts_size() + 515 insts_size() + 516 stub_size() + 517 scopes_data_size() + 518 scopes_pcs_size() + 519 handler_table_size() + 520 nul_chk_table_size(); 521 } 522 523 const char* nmethod::compile_kind() const { 524 if (is_osr_method()) return "osr"; 525 if (method() != NULL && is_native_method()) return "c2n"; 526 return NULL; 527 } 528 529 // Fill in default values for various flag fields 530 void nmethod::init_defaults() { 531 _state = in_use; 532 _unloading_clock = 0; 533 _has_flushed_dependencies = 0; 534 _has_unsafe_access = 0; 535 _has_method_handle_invokes = 0; 536 _lazy_critical_native = 0; 537 _has_wide_vectors = 0; 538 _mark_for_deoptimization_status = not_marked; 539 _lock_count = 0; 540 _stack_traversal_mark = 0; 541 _unload_reported = false; // jvmti state 542 543 #ifdef ASSERT 544 _oops_are_stale = false; 545 #endif 546 547 _oops_do_mark_link = NULL; 548 _jmethod_id = NULL; 549 _osr_link = NULL; 550 if (UseG1GC) { 551 _unloading_next = NULL; 552 } else { 553 _scavenge_root_link = NULL; 554 } 555 _scavenge_root_state = 0; 556 _compiler = NULL; 557 #if INCLUDE_RTM_OPT 558 _rtm_state = NoRTM; 559 #endif 560 #if INCLUDE_JVMCI 561 _jvmci_installed_code = NULL; 562 _speculation_log = NULL; 563 #endif 564 } 565 566 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 567 int compile_id, 568 CodeBuffer *code_buffer, 569 int vep_offset, 570 int frame_complete, 571 int frame_size, 572 ByteSize basic_lock_owner_sp_offset, 573 ByteSize basic_lock_sp_offset, 574 OopMapSet* oop_maps) { 575 code_buffer->finalize_oop_references(method); 576 // create nmethod 577 nmethod* nm = NULL; 578 { 579 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 580 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 581 CodeOffsets offsets; 582 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 583 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 584 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 585 compile_id, &offsets, 586 code_buffer, frame_size, 587 basic_lock_owner_sp_offset, 588 basic_lock_sp_offset, oop_maps); 589 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 590 } 591 // verify nmethod 592 debug_only(if (nm) nm->verify();) // might block 593 594 if (nm != NULL) { 595 nm->log_new_nmethod(); 596 } 597 598 return nm; 599 } 600 601 nmethod* nmethod::new_nmethod(const methodHandle& method, 602 int compile_id, 603 int entry_bci, 604 CodeOffsets* offsets, 605 int orig_pc_offset, 606 DebugInformationRecorder* debug_info, 607 Dependencies* dependencies, 608 CodeBuffer* code_buffer, int frame_size, 609 OopMapSet* oop_maps, 610 ExceptionHandlerTable* handler_table, 611 ImplicitExceptionTable* nul_chk_table, 612 AbstractCompiler* compiler, 613 int comp_level 614 #if INCLUDE_JVMCI 615 , Handle installed_code, 616 Handle speculationLog 617 #endif 618 ) 619 { 620 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 621 code_buffer->finalize_oop_references(method); 622 // create nmethod 623 nmethod* nm = NULL; 624 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 625 int nmethod_size = 626 allocation_size(code_buffer, sizeof(nmethod)) 627 + adjust_pcs_size(debug_info->pcs_size()) 628 + round_to(dependencies->size_in_bytes() , oopSize) 629 + round_to(handler_table->size_in_bytes(), oopSize) 630 + round_to(nul_chk_table->size_in_bytes(), oopSize) 631 + round_to(debug_info->data_size() , oopSize); 632 633 nm = new (nmethod_size, comp_level) 634 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 635 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 636 oop_maps, 637 handler_table, 638 nul_chk_table, 639 compiler, 640 comp_level 641 #if INCLUDE_JVMCI 642 , installed_code, 643 speculationLog 644 #endif 645 ); 646 647 if (nm != NULL) { 648 // To make dependency checking during class loading fast, record 649 // the nmethod dependencies in the classes it is dependent on. 650 // This allows the dependency checking code to simply walk the 651 // class hierarchy above the loaded class, checking only nmethods 652 // which are dependent on those classes. The slow way is to 653 // check every nmethod for dependencies which makes it linear in 654 // the number of methods compiled. For applications with a lot 655 // classes the slow way is too slow. 656 for (Dependencies::DepStream deps(nm); deps.next(); ) { 657 if (deps.type() == Dependencies::call_site_target_value) { 658 // CallSite dependencies are managed on per-CallSite instance basis. 659 oop call_site = deps.argument_oop(0); 660 MethodHandles::add_dependent_nmethod(call_site, nm); 661 } else { 662 Klass* klass = deps.context_type(); 663 if (klass == NULL) { 664 continue; // ignore things like evol_method 665 } 666 // record this nmethod as dependent on this klass 667 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 668 } 669 } 670 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 671 } 672 } 673 // Do verification and logging outside CodeCache_lock. 674 if (nm != NULL) { 675 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 676 DEBUG_ONLY(nm->verify();) 677 nm->log_new_nmethod(); 678 } 679 return nm; 680 } 681 682 // For native wrappers 683 nmethod::nmethod( 684 Method* method, 685 int nmethod_size, 686 int compile_id, 687 CodeOffsets* offsets, 688 CodeBuffer* code_buffer, 689 int frame_size, 690 ByteSize basic_lock_owner_sp_offset, 691 ByteSize basic_lock_sp_offset, 692 OopMapSet* oop_maps ) 693 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 694 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 695 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 696 _native_basic_lock_sp_offset(basic_lock_sp_offset) 697 { 698 { 699 debug_only(NoSafepointVerifier nsv;) 700 assert_locked_or_safepoint(CodeCache_lock); 701 702 init_defaults(); 703 _method = method; 704 _entry_bci = InvocationEntryBci; 705 // We have no exception handler or deopt handler make the 706 // values something that will never match a pc like the nmethod vtable entry 707 _exception_offset = 0; 708 _deoptimize_offset = 0; 709 _deoptimize_mh_offset = 0; 710 _orig_pc_offset = 0; 711 712 _consts_offset = data_offset(); 713 _stub_offset = data_offset(); 714 _oops_offset = data_offset(); 715 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 716 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 717 _scopes_pcs_offset = _scopes_data_offset; 718 _dependencies_offset = _scopes_pcs_offset; 719 _handler_table_offset = _dependencies_offset; 720 _nul_chk_table_offset = _handler_table_offset; 721 _nmethod_end_offset = _nul_chk_table_offset; 722 _compile_id = compile_id; 723 _comp_level = CompLevel_none; 724 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 725 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 726 _osr_entry_point = NULL; 727 _exception_cache = NULL; 728 _pc_desc_cache.reset_to(NULL); 729 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 730 731 code_buffer->copy_values_to(this); 732 if (ScavengeRootsInCode) { 733 if (detect_scavenge_root_oops()) { 734 CodeCache::add_scavenge_root_nmethod(this); 735 } 736 Universe::heap()->register_nmethod(this); 737 } 738 debug_only(verify_scavenge_root_oops()); 739 CodeCache::commit(this); 740 } 741 742 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 743 ttyLocker ttyl; // keep the following output all in one block 744 // This output goes directly to the tty, not the compiler log. 745 // To enable tools to match it up with the compilation activity, 746 // be sure to tag this tty output with the compile ID. 747 if (xtty != NULL) { 748 xtty->begin_head("print_native_nmethod"); 749 xtty->method(_method); 750 xtty->stamp(); 751 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 752 } 753 // print the header part first 754 print(); 755 // then print the requested information 756 if (PrintNativeNMethods) { 757 print_code(); 758 if (oop_maps != NULL) { 759 oop_maps->print(); 760 } 761 } 762 if (PrintRelocations) { 763 print_relocations(); 764 } 765 if (xtty != NULL) { 766 xtty->tail("print_native_nmethod"); 767 } 768 } 769 } 770 771 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 772 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 773 } 774 775 nmethod::nmethod( 776 Method* method, 777 int nmethod_size, 778 int compile_id, 779 int entry_bci, 780 CodeOffsets* offsets, 781 int orig_pc_offset, 782 DebugInformationRecorder* debug_info, 783 Dependencies* dependencies, 784 CodeBuffer *code_buffer, 785 int frame_size, 786 OopMapSet* oop_maps, 787 ExceptionHandlerTable* handler_table, 788 ImplicitExceptionTable* nul_chk_table, 789 AbstractCompiler* compiler, 790 int comp_level 791 #if INCLUDE_JVMCI 792 , Handle installed_code, 793 Handle speculation_log 794 #endif 795 ) 796 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 797 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 798 _native_receiver_sp_offset(in_ByteSize(-1)), 799 _native_basic_lock_sp_offset(in_ByteSize(-1)) 800 { 801 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 802 { 803 debug_only(NoSafepointVerifier nsv;) 804 assert_locked_or_safepoint(CodeCache_lock); 805 806 init_defaults(); 807 _method = method; 808 _entry_bci = entry_bci; 809 _compile_id = compile_id; 810 _comp_level = comp_level; 811 _compiler = compiler; 812 _orig_pc_offset = orig_pc_offset; 813 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 814 815 // Section offsets 816 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 817 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 818 819 #if INCLUDE_JVMCI 820 _jvmci_installed_code = installed_code(); 821 _speculation_log = (instanceOop)speculation_log(); 822 823 if (compiler->is_jvmci()) { 824 // JVMCI might not produce any stub sections 825 if (offsets->value(CodeOffsets::Exceptions) != -1) { 826 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 827 } else { 828 _exception_offset = -1; 829 } 830 if (offsets->value(CodeOffsets::Deopt) != -1) { 831 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 832 } else { 833 _deoptimize_offset = -1; 834 } 835 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 836 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 837 } else { 838 _deoptimize_mh_offset = -1; 839 } 840 } else { 841 #endif 842 // Exception handler and deopt handler are in the stub section 843 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 844 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 845 846 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 847 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 848 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 849 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 850 } else { 851 _deoptimize_mh_offset = -1; 852 #if INCLUDE_JVMCI 853 } 854 #endif 855 } 856 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 857 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 858 } else { 859 _unwind_handler_offset = -1; 860 } 861 862 _oops_offset = data_offset(); 863 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 864 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 865 866 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 867 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 868 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 869 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 870 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 871 872 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 873 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 874 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 875 _exception_cache = NULL; 876 _pc_desc_cache.reset_to(scopes_pcs_begin()); 877 878 // Copy contents of ScopeDescRecorder to nmethod 879 code_buffer->copy_values_to(this); 880 debug_info->copy_to(this); 881 dependencies->copy_to(this); 882 if (ScavengeRootsInCode) { 883 if (detect_scavenge_root_oops()) { 884 CodeCache::add_scavenge_root_nmethod(this); 885 } 886 Universe::heap()->register_nmethod(this); 887 } 888 debug_only(verify_scavenge_root_oops()); 889 890 CodeCache::commit(this); 891 892 // Copy contents of ExceptionHandlerTable to nmethod 893 handler_table->copy_to(this); 894 nul_chk_table->copy_to(this); 895 896 // we use the information of entry points to find out if a method is 897 // static or non static 898 assert(compiler->is_c2() || compiler->is_jvmci() || 899 _method->is_static() == (entry_point() == _verified_entry_point), 900 " entry points must be same for static methods and vice versa"); 901 } 902 } 903 904 // Print a short set of xml attributes to identify this nmethod. The 905 // output should be embedded in some other element. 906 void nmethod::log_identity(xmlStream* log) const { 907 log->print(" compile_id='%d'", compile_id()); 908 const char* nm_kind = compile_kind(); 909 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 910 if (compiler() != NULL) { 911 log->print(" compiler='%s'", compiler()->name()); 912 } 913 if (TieredCompilation) { 914 log->print(" level='%d'", comp_level()); 915 } 916 } 917 918 919 #define LOG_OFFSET(log, name) \ 920 if (p2i(name##_end()) - p2i(name##_begin())) \ 921 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 922 p2i(name##_begin()) - p2i(this)) 923 924 925 void nmethod::log_new_nmethod() const { 926 if (LogCompilation && xtty != NULL) { 927 ttyLocker ttyl; 928 HandleMark hm; 929 xtty->begin_elem("nmethod"); 930 log_identity(xtty); 931 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 932 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 933 934 LOG_OFFSET(xtty, relocation); 935 LOG_OFFSET(xtty, consts); 936 LOG_OFFSET(xtty, insts); 937 LOG_OFFSET(xtty, stub); 938 LOG_OFFSET(xtty, scopes_data); 939 LOG_OFFSET(xtty, scopes_pcs); 940 LOG_OFFSET(xtty, dependencies); 941 LOG_OFFSET(xtty, handler_table); 942 LOG_OFFSET(xtty, nul_chk_table); 943 LOG_OFFSET(xtty, oops); 944 LOG_OFFSET(xtty, metadata); 945 946 xtty->method(method()); 947 xtty->stamp(); 948 xtty->end_elem(); 949 } 950 } 951 952 #undef LOG_OFFSET 953 954 955 // Print out more verbose output usually for a newly created nmethod. 956 void nmethod::print_on(outputStream* st, const char* msg) const { 957 if (st != NULL) { 958 ttyLocker ttyl; 959 if (WizardMode) { 960 CompileTask::print(st, this, msg, /*short_form:*/ true); 961 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 962 } else { 963 CompileTask::print(st, this, msg, /*short_form:*/ false); 964 } 965 } 966 } 967 968 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 969 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 970 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 971 print_nmethod(printnmethods); 972 } 973 } 974 975 void nmethod::print_nmethod(bool printmethod) { 976 ttyLocker ttyl; // keep the following output all in one block 977 if (xtty != NULL) { 978 xtty->begin_head("print_nmethod"); 979 xtty->stamp(); 980 xtty->end_head(); 981 } 982 // print the header part first 983 print(); 984 // then print the requested information 985 if (printmethod) { 986 print_code(); 987 print_pcs(); 988 if (oop_maps()) { 989 oop_maps()->print(); 990 } 991 } 992 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 993 print_scopes(); 994 } 995 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 996 print_relocations(); 997 } 998 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 999 print_dependencies(); 1000 } 1001 if (printmethod || PrintExceptionHandlers) { 1002 print_handler_table(); 1003 print_nul_chk_table(); 1004 } 1005 if (printmethod) { 1006 print_recorded_oops(); 1007 print_recorded_metadata(); 1008 } 1009 if (xtty != NULL) { 1010 xtty->tail("print_nmethod"); 1011 } 1012 } 1013 1014 1015 // Promote one word from an assembly-time handle to a live embedded oop. 1016 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1017 if (handle == NULL || 1018 // As a special case, IC oops are initialized to 1 or -1. 1019 handle == (jobject) Universe::non_oop_word()) { 1020 (*dest) = (oop) handle; 1021 } else { 1022 (*dest) = JNIHandles::resolve_non_null(handle); 1023 } 1024 } 1025 1026 1027 // Have to have the same name because it's called by a template 1028 void nmethod::copy_values(GrowableArray<jobject>* array) { 1029 int length = array->length(); 1030 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1031 oop* dest = oops_begin(); 1032 for (int index = 0 ; index < length; index++) { 1033 initialize_immediate_oop(&dest[index], array->at(index)); 1034 } 1035 1036 // Now we can fix up all the oops in the code. We need to do this 1037 // in the code because the assembler uses jobjects as placeholders. 1038 // The code and relocations have already been initialized by the 1039 // CodeBlob constructor, so it is valid even at this early point to 1040 // iterate over relocations and patch the code. 1041 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1042 } 1043 1044 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1045 int length = array->length(); 1046 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1047 Metadata** dest = metadata_begin(); 1048 for (int index = 0 ; index < length; index++) { 1049 dest[index] = array->at(index); 1050 } 1051 } 1052 1053 bool nmethod::is_at_poll_return(address pc) { 1054 RelocIterator iter(this, pc, pc+1); 1055 while (iter.next()) { 1056 if (iter.type() == relocInfo::poll_return_type) 1057 return true; 1058 } 1059 return false; 1060 } 1061 1062 1063 bool nmethod::is_at_poll_or_poll_return(address pc) { 1064 RelocIterator iter(this, pc, pc+1); 1065 while (iter.next()) { 1066 relocInfo::relocType t = iter.type(); 1067 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1068 return true; 1069 } 1070 return false; 1071 } 1072 1073 1074 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1075 // re-patch all oop-bearing instructions, just in case some oops moved 1076 RelocIterator iter(this, begin, end); 1077 while (iter.next()) { 1078 if (iter.type() == relocInfo::oop_type) { 1079 oop_Relocation* reloc = iter.oop_reloc(); 1080 if (initialize_immediates && reloc->oop_is_immediate()) { 1081 oop* dest = reloc->oop_addr(); 1082 initialize_immediate_oop(dest, (jobject) *dest); 1083 } 1084 // Refresh the oop-related bits of this instruction. 1085 reloc->fix_oop_relocation(); 1086 } else if (iter.type() == relocInfo::metadata_type) { 1087 metadata_Relocation* reloc = iter.metadata_reloc(); 1088 reloc->fix_metadata_relocation(); 1089 } 1090 } 1091 } 1092 1093 1094 void nmethod::verify_oop_relocations() { 1095 // Ensure sure that the code matches the current oop values 1096 RelocIterator iter(this, NULL, NULL); 1097 while (iter.next()) { 1098 if (iter.type() == relocInfo::oop_type) { 1099 oop_Relocation* reloc = iter.oop_reloc(); 1100 if (!reloc->oop_is_immediate()) { 1101 reloc->verify_oop_relocation(); 1102 } 1103 } 1104 } 1105 } 1106 1107 1108 ScopeDesc* nmethod::scope_desc_at(address pc) { 1109 PcDesc* pd = pc_desc_at(pc); 1110 guarantee(pd != NULL, "scope must be present"); 1111 return new ScopeDesc(this, pd->scope_decode_offset(), 1112 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 1113 pd->return_oop()); 1114 } 1115 1116 1117 void nmethod::clear_inline_caches() { 1118 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1119 if (is_zombie()) { 1120 return; 1121 } 1122 1123 RelocIterator iter(this); 1124 while (iter.next()) { 1125 iter.reloc()->clear_inline_cache(); 1126 } 1127 } 1128 1129 // Clear ICStubs of all compiled ICs 1130 void nmethod::clear_ic_stubs() { 1131 assert_locked_or_safepoint(CompiledIC_lock); 1132 RelocIterator iter(this); 1133 while(iter.next()) { 1134 if (iter.type() == relocInfo::virtual_call_type) { 1135 CompiledIC* ic = CompiledIC_at(&iter); 1136 ic->clear_ic_stub(); 1137 } 1138 } 1139 } 1140 1141 1142 void nmethod::cleanup_inline_caches() { 1143 assert_locked_or_safepoint(CompiledIC_lock); 1144 1145 // If the method is not entrant or zombie then a JMP is plastered over the 1146 // first few bytes. If an oop in the old code was there, that oop 1147 // should not get GC'd. Skip the first few bytes of oops on 1148 // not-entrant methods. 1149 address low_boundary = verified_entry_point(); 1150 if (!is_in_use()) { 1151 low_boundary += NativeJump::instruction_size; 1152 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1153 // This means that the low_boundary is going to be a little too high. 1154 // This shouldn't matter, since oops of non-entrant methods are never used. 1155 // In fact, why are we bothering to look at oops in a non-entrant method?? 1156 } 1157 1158 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1159 // zombie and unloaded nmethods. 1160 ResourceMark rm; 1161 RelocIterator iter(this, low_boundary); 1162 while(iter.next()) { 1163 switch(iter.type()) { 1164 case relocInfo::virtual_call_type: 1165 case relocInfo::opt_virtual_call_type: { 1166 CompiledIC *ic = CompiledIC_at(&iter); 1167 // Ok, to lookup references to zombies here 1168 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1169 if( cb != NULL && cb->is_nmethod() ) { 1170 nmethod* nm = (nmethod*)cb; 1171 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1172 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1173 } 1174 break; 1175 } 1176 case relocInfo::static_call_type: { 1177 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1178 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1179 if( cb != NULL && cb->is_nmethod() ) { 1180 nmethod* nm = (nmethod*)cb; 1181 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1182 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1183 } 1184 break; 1185 } 1186 } 1187 } 1188 } 1189 1190 void nmethod::verify_clean_inline_caches() { 1191 assert_locked_or_safepoint(CompiledIC_lock); 1192 1193 // If the method is not entrant or zombie then a JMP is plastered over the 1194 // first few bytes. If an oop in the old code was there, that oop 1195 // should not get GC'd. Skip the first few bytes of oops on 1196 // not-entrant methods. 1197 address low_boundary = verified_entry_point(); 1198 if (!is_in_use()) { 1199 low_boundary += NativeJump::instruction_size; 1200 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1201 // This means that the low_boundary is going to be a little too high. 1202 // This shouldn't matter, since oops of non-entrant methods are never used. 1203 // In fact, why are we bothering to look at oops in a non-entrant method?? 1204 } 1205 1206 ResourceMark rm; 1207 RelocIterator iter(this, low_boundary); 1208 while(iter.next()) { 1209 switch(iter.type()) { 1210 case relocInfo::virtual_call_type: 1211 case relocInfo::opt_virtual_call_type: { 1212 CompiledIC *ic = CompiledIC_at(&iter); 1213 // Ok, to lookup references to zombies here 1214 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1215 if( cb != NULL && cb->is_nmethod() ) { 1216 nmethod* nm = (nmethod*)cb; 1217 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1218 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1219 assert(ic->is_clean(), "IC should be clean"); 1220 } 1221 } 1222 break; 1223 } 1224 case relocInfo::static_call_type: { 1225 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1226 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1227 if( cb != NULL && cb->is_nmethod() ) { 1228 nmethod* nm = (nmethod*)cb; 1229 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1230 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1231 assert(csc->is_clean(), "IC should be clean"); 1232 } 1233 } 1234 break; 1235 } 1236 } 1237 } 1238 } 1239 1240 int nmethod::verify_icholder_relocations() { 1241 int count = 0; 1242 1243 RelocIterator iter(this); 1244 while(iter.next()) { 1245 if (iter.type() == relocInfo::virtual_call_type) { 1246 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1247 CompiledIC *ic = CompiledIC_at(&iter); 1248 if (TraceCompiledIC) { 1249 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1250 ic->print(); 1251 } 1252 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1253 count++; 1254 } 1255 } 1256 } 1257 1258 return count; 1259 } 1260 1261 // This is a private interface with the sweeper. 1262 void nmethod::mark_as_seen_on_stack() { 1263 assert(is_alive(), "Must be an alive method"); 1264 // Set the traversal mark to ensure that the sweeper does 2 1265 // cleaning passes before moving to zombie. 1266 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1267 } 1268 1269 // Tell if a non-entrant method can be converted to a zombie (i.e., 1270 // there are no activations on the stack, not in use by the VM, 1271 // and not in use by the ServiceThread) 1272 bool nmethod::can_convert_to_zombie() { 1273 assert(is_not_entrant(), "must be a non-entrant method"); 1274 1275 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1276 // count can be greater than the stack traversal count before it hits the 1277 // nmethod for the second time. 1278 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1279 !is_locked_by_vm(); 1280 } 1281 1282 void nmethod::inc_decompile_count() { 1283 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1284 // Could be gated by ProfileTraps, but do not bother... 1285 Method* m = method(); 1286 if (m == NULL) return; 1287 MethodData* mdo = m->method_data(); 1288 if (mdo == NULL) return; 1289 // There is a benign race here. See comments in methodData.hpp. 1290 mdo->inc_decompile_count(); 1291 } 1292 1293 void nmethod::increase_unloading_clock() { 1294 _global_unloading_clock++; 1295 if (_global_unloading_clock == 0) { 1296 // _nmethods are allocated with _unloading_clock == 0, 1297 // so 0 is never used as a clock value. 1298 _global_unloading_clock = 1; 1299 } 1300 } 1301 1302 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1303 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1304 } 1305 1306 unsigned char nmethod::unloading_clock() { 1307 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1308 } 1309 1310 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1311 1312 post_compiled_method_unload(); 1313 1314 // Since this nmethod is being unloaded, make sure that dependencies 1315 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1316 // indicate that this work is being done during a GC. 1317 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1318 assert(is_alive != NULL, "Should be non-NULL"); 1319 // A non-NULL is_alive closure indicates that this is being called during GC. 1320 flush_dependencies(is_alive); 1321 1322 // Break cycle between nmethod & method 1323 if (log_is_enabled(Trace, classunload)) { 1324 outputStream* log = LogHandle(classunload)::trace_stream(); 1325 log->print_cr("making nmethod " INTPTR_FORMAT 1326 " unloadable, Method*(" INTPTR_FORMAT 1327 "), cause(" INTPTR_FORMAT ")", 1328 p2i(this), p2i(_method), p2i(cause)); 1329 if (!Universe::heap()->is_gc_active()) 1330 cause->klass()->print_on(log); 1331 } 1332 // Unlink the osr method, so we do not look this up again 1333 if (is_osr_method()) { 1334 // Invalidate the osr nmethod only once 1335 if (is_in_use()) { 1336 invalidate_osr_method(); 1337 } 1338 #ifndef ASSERT 1339 // Make sure osr nmethod is invalidated, i.e. not on the list 1340 bool found = method()->method_holder()->remove_osr_nmethod(this); 1341 assert(!found, "osr nmethod should have been invalidated"); 1342 #endif 1343 } 1344 1345 // If _method is already NULL the Method* is about to be unloaded, 1346 // so we don't have to break the cycle. Note that it is possible to 1347 // have the Method* live here, in case we unload the nmethod because 1348 // it is pointing to some oop (other than the Method*) being unloaded. 1349 if (_method != NULL) { 1350 // OSR methods point to the Method*, but the Method* does not 1351 // point back! 1352 if (_method->code() == this) { 1353 _method->clear_code(); // Break a cycle 1354 } 1355 _method = NULL; // Clear the method of this dead nmethod 1356 } 1357 1358 // Make the class unloaded - i.e., change state and notify sweeper 1359 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1360 if (is_in_use()) { 1361 // Transitioning directly from live to unloaded -- so 1362 // we need to force a cache clean-up; remember this 1363 // for later on. 1364 CodeCache::set_needs_cache_clean(true); 1365 } 1366 1367 // Unregister must be done before the state change 1368 Universe::heap()->unregister_nmethod(this); 1369 1370 _state = unloaded; 1371 1372 // Log the unloading. 1373 log_state_change(); 1374 1375 #if INCLUDE_JVMCI 1376 // The method can only be unloaded after the pointer to the installed code 1377 // Java wrapper is no longer alive. Here we need to clear out this weak 1378 // reference to the dead object. Nulling out the reference has to happen 1379 // after the method is unregistered since the original value may be still 1380 // tracked by the rset. 1381 maybe_invalidate_installed_code(); 1382 // Clear these out after the nmethod has been unregistered and any 1383 // updates to the InstalledCode instance have been performed. 1384 _jvmci_installed_code = NULL; 1385 _speculation_log = NULL; 1386 #endif 1387 1388 // The Method* is gone at this point 1389 assert(_method == NULL, "Tautology"); 1390 1391 set_osr_link(NULL); 1392 NMethodSweeper::report_state_change(this); 1393 } 1394 1395 void nmethod::invalidate_osr_method() { 1396 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1397 // Remove from list of active nmethods 1398 if (method() != NULL) { 1399 method()->method_holder()->remove_osr_nmethod(this); 1400 } 1401 } 1402 1403 void nmethod::log_state_change() const { 1404 if (LogCompilation) { 1405 if (xtty != NULL) { 1406 ttyLocker ttyl; // keep the following output all in one block 1407 if (_state == unloaded) { 1408 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1409 os::current_thread_id()); 1410 } else { 1411 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1412 os::current_thread_id(), 1413 (_state == zombie ? " zombie='1'" : "")); 1414 } 1415 log_identity(xtty); 1416 xtty->stamp(); 1417 xtty->end_elem(); 1418 } 1419 } 1420 if (PrintCompilation && _state != unloaded) { 1421 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1422 } 1423 } 1424 1425 /** 1426 * Common functionality for both make_not_entrant and make_zombie 1427 */ 1428 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1429 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1430 assert(!is_zombie(), "should not already be a zombie"); 1431 1432 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1433 nmethodLocker nml(this); 1434 methodHandle the_method(method()); 1435 NoSafepointVerifier nsv; 1436 1437 // during patching, depending on the nmethod state we must notify the GC that 1438 // code has been unloaded, unregistering it. We cannot do this right while 1439 // holding the Patching_lock because we need to use the CodeCache_lock. This 1440 // would be prone to deadlocks. 1441 // This flag is used to remember whether we need to later lock and unregister. 1442 bool nmethod_needs_unregister = false; 1443 1444 { 1445 // invalidate osr nmethod before acquiring the patching lock since 1446 // they both acquire leaf locks and we don't want a deadlock. 1447 // This logic is equivalent to the logic below for patching the 1448 // verified entry point of regular methods. We check that the 1449 // nmethod is in use to ensure that it is invalidated only once. 1450 if (is_osr_method() && is_in_use()) { 1451 // this effectively makes the osr nmethod not entrant 1452 invalidate_osr_method(); 1453 } 1454 1455 // Enter critical section. Does not block for safepoint. 1456 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1457 1458 if (_state == state) { 1459 // another thread already performed this transition so nothing 1460 // to do, but return false to indicate this. 1461 return false; 1462 } 1463 1464 // The caller can be calling the method statically or through an inline 1465 // cache call. 1466 if (!is_osr_method() && !is_not_entrant()) { 1467 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1468 SharedRuntime::get_handle_wrong_method_stub()); 1469 } 1470 1471 if (is_in_use() && update_recompile_counts()) { 1472 // It's a true state change, so mark the method as decompiled. 1473 // Do it only for transition from alive. 1474 inc_decompile_count(); 1475 } 1476 1477 // If the state is becoming a zombie, signal to unregister the nmethod with 1478 // the heap. 1479 // This nmethod may have already been unloaded during a full GC. 1480 if ((state == zombie) && !is_unloaded()) { 1481 nmethod_needs_unregister = true; 1482 } 1483 1484 // Must happen before state change. Otherwise we have a race condition in 1485 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1486 // transition its state from 'not_entrant' to 'zombie' without having to wait 1487 // for stack scanning. 1488 if (state == not_entrant) { 1489 mark_as_seen_on_stack(); 1490 OrderAccess::storestore(); 1491 } 1492 1493 // Change state 1494 _state = state; 1495 1496 // Log the transition once 1497 log_state_change(); 1498 1499 // Invalidate while holding the patching lock 1500 JVMCI_ONLY(maybe_invalidate_installed_code()); 1501 1502 // Remove nmethod from method. 1503 // We need to check if both the _code and _from_compiled_code_entry_point 1504 // refer to this nmethod because there is a race in setting these two fields 1505 // in Method* as seen in bugid 4947125. 1506 // If the vep() points to the zombie nmethod, the memory for the nmethod 1507 // could be flushed and the compiler and vtable stubs could still call 1508 // through it. 1509 if (method() != NULL && (method()->code() == this || 1510 method()->from_compiled_entry() == verified_entry_point())) { 1511 HandleMark hm; 1512 method()->clear_code(); 1513 } 1514 } // leave critical region under Patching_lock 1515 1516 #ifndef ASSERT 1517 if (is_osr_method()) { 1518 // Make sure osr nmethod is invalidated, i.e. not on the list 1519 bool found = method()->method_holder()->remove_osr_nmethod(this); 1520 assert(!found, "osr nmethod should have been invalidated"); 1521 } 1522 #endif 1523 1524 // When the nmethod becomes zombie it is no longer alive so the 1525 // dependencies must be flushed. nmethods in the not_entrant 1526 // state will be flushed later when the transition to zombie 1527 // happens or they get unloaded. 1528 if (state == zombie) { 1529 { 1530 // Flushing dependencies must be done before any possible 1531 // safepoint can sneak in, otherwise the oops used by the 1532 // dependency logic could have become stale. 1533 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1534 if (nmethod_needs_unregister) { 1535 Universe::heap()->unregister_nmethod(this); 1536 #ifdef JVMCI 1537 _jvmci_installed_code = NULL; 1538 _speculation_log = NULL; 1539 #endif 1540 } 1541 flush_dependencies(NULL); 1542 } 1543 1544 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1545 // event and it hasn't already been reported for this nmethod then 1546 // report it now. The event may have been reported earlier if the GC 1547 // marked it for unloading). JvmtiDeferredEventQueue support means 1548 // we no longer go to a safepoint here. 1549 post_compiled_method_unload(); 1550 1551 #ifdef ASSERT 1552 // It's no longer safe to access the oops section since zombie 1553 // nmethods aren't scanned for GC. 1554 _oops_are_stale = true; 1555 #endif 1556 // the Method may be reclaimed by class unloading now that the 1557 // nmethod is in zombie state 1558 set_method(NULL); 1559 } else { 1560 assert(state == not_entrant, "other cases may need to be handled differently"); 1561 } 1562 1563 if (TraceCreateZombies) { 1564 ResourceMark m; 1565 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); 1566 } 1567 1568 NMethodSweeper::report_state_change(this); 1569 return true; 1570 } 1571 1572 void nmethod::flush() { 1573 // Note that there are no valid oops in the nmethod anymore. 1574 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1575 "osr nmethod must be unloaded or zombie before flushing"); 1576 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1577 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1578 assert_locked_or_safepoint(CodeCache_lock); 1579 1580 // completely deallocate this method 1581 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1582 if (PrintMethodFlushing) { 1583 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1584 "/Free CodeCache:" SIZE_FORMAT "Kb", 1585 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1586 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1587 } 1588 1589 // We need to deallocate any ExceptionCache data. 1590 // Note that we do not need to grab the nmethod lock for this, it 1591 // better be thread safe if we're disposing of it! 1592 ExceptionCache* ec = exception_cache(); 1593 set_exception_cache(NULL); 1594 while(ec != NULL) { 1595 ExceptionCache* next = ec->next(); 1596 delete ec; 1597 ec = next; 1598 } 1599 1600 if (on_scavenge_root_list()) { 1601 CodeCache::drop_scavenge_root_nmethod(this); 1602 } 1603 1604 #ifdef SHARK 1605 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1606 #endif // SHARK 1607 1608 ((CodeBlob*)(this))->flush(); 1609 1610 CodeCache::free(this); 1611 } 1612 1613 // 1614 // Notify all classes this nmethod is dependent on that it is no 1615 // longer dependent. This should only be called in two situations. 1616 // First, when a nmethod transitions to a zombie all dependents need 1617 // to be clear. Since zombification happens at a safepoint there's no 1618 // synchronization issues. The second place is a little more tricky. 1619 // During phase 1 of mark sweep class unloading may happen and as a 1620 // result some nmethods may get unloaded. In this case the flushing 1621 // of dependencies must happen during phase 1 since after GC any 1622 // dependencies in the unloaded nmethod won't be updated, so 1623 // traversing the dependency information in unsafe. In that case this 1624 // function is called with a non-NULL argument and this function only 1625 // notifies instanceKlasses that are reachable 1626 1627 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1628 assert_locked_or_safepoint(CodeCache_lock); 1629 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1630 "is_alive is non-NULL if and only if we are called during GC"); 1631 if (!has_flushed_dependencies()) { 1632 set_has_flushed_dependencies(); 1633 for (Dependencies::DepStream deps(this); deps.next(); ) { 1634 if (deps.type() == Dependencies::call_site_target_value) { 1635 // CallSite dependencies are managed on per-CallSite instance basis. 1636 oop call_site = deps.argument_oop(0); 1637 MethodHandles::remove_dependent_nmethod(call_site, this); 1638 } else { 1639 Klass* klass = deps.context_type(); 1640 if (klass == NULL) { 1641 continue; // ignore things like evol_method 1642 } 1643 // During GC the is_alive closure is non-NULL, and is used to 1644 // determine liveness of dependees that need to be updated. 1645 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1646 // The GC defers deletion of this entry, since there might be multiple threads 1647 // iterating over the _dependencies graph. Other call paths are single-threaded 1648 // and may delete it immediately. 1649 bool delete_immediately = is_alive == NULL; 1650 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1651 } 1652 } 1653 } 1654 } 1655 } 1656 1657 1658 // If this oop is not live, the nmethod can be unloaded. 1659 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1660 assert(root != NULL, "just checking"); 1661 oop obj = *root; 1662 if (obj == NULL || is_alive->do_object_b(obj)) { 1663 return false; 1664 } 1665 1666 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1667 // simply because one of its constant oops has gone dead. 1668 // No actual classes need to be unloaded in order for this to occur. 1669 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1670 make_unloaded(is_alive, obj); 1671 return true; 1672 } 1673 1674 // ------------------------------------------------------------------ 1675 // post_compiled_method_load_event 1676 // new method for install_code() path 1677 // Transfer information from compilation to jvmti 1678 void nmethod::post_compiled_method_load_event() { 1679 1680 Method* moop = method(); 1681 HOTSPOT_COMPILED_METHOD_LOAD( 1682 (char *) moop->klass_name()->bytes(), 1683 moop->klass_name()->utf8_length(), 1684 (char *) moop->name()->bytes(), 1685 moop->name()->utf8_length(), 1686 (char *) moop->signature()->bytes(), 1687 moop->signature()->utf8_length(), 1688 insts_begin(), insts_size()); 1689 1690 if (JvmtiExport::should_post_compiled_method_load() || 1691 JvmtiExport::should_post_compiled_method_unload()) { 1692 get_and_cache_jmethod_id(); 1693 } 1694 1695 if (JvmtiExport::should_post_compiled_method_load()) { 1696 // Let the Service thread (which is a real Java thread) post the event 1697 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1698 JvmtiDeferredEventQueue::enqueue( 1699 JvmtiDeferredEvent::compiled_method_load_event(this)); 1700 } 1701 } 1702 1703 jmethodID nmethod::get_and_cache_jmethod_id() { 1704 if (_jmethod_id == NULL) { 1705 // Cache the jmethod_id since it can no longer be looked up once the 1706 // method itself has been marked for unloading. 1707 _jmethod_id = method()->jmethod_id(); 1708 } 1709 return _jmethod_id; 1710 } 1711 1712 void nmethod::post_compiled_method_unload() { 1713 if (unload_reported()) { 1714 // During unloading we transition to unloaded and then to zombie 1715 // and the unloading is reported during the first transition. 1716 return; 1717 } 1718 1719 assert(_method != NULL && !is_unloaded(), "just checking"); 1720 DTRACE_METHOD_UNLOAD_PROBE(method()); 1721 1722 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1723 // post the event. Sometime later this nmethod will be made a zombie 1724 // by the sweeper but the Method* will not be valid at that point. 1725 // If the _jmethod_id is null then no load event was ever requested 1726 // so don't bother posting the unload. The main reason for this is 1727 // that the jmethodID is a weak reference to the Method* so if 1728 // it's being unloaded there's no way to look it up since the weak 1729 // ref will have been cleared. 1730 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1731 assert(!unload_reported(), "already unloaded"); 1732 JvmtiDeferredEvent event = 1733 JvmtiDeferredEvent::compiled_method_unload_event(this, 1734 _jmethod_id, insts_begin()); 1735 if (SafepointSynchronize::is_at_safepoint()) { 1736 // Don't want to take the queueing lock. Add it as pending and 1737 // it will get enqueued later. 1738 JvmtiDeferredEventQueue::add_pending_event(event); 1739 } else { 1740 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1741 JvmtiDeferredEventQueue::enqueue(event); 1742 } 1743 } 1744 1745 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1746 // any time. As the nmethod is being unloaded now we mark it has 1747 // having the unload event reported - this will ensure that we don't 1748 // attempt to report the event in the unlikely scenario where the 1749 // event is enabled at the time the nmethod is made a zombie. 1750 set_unload_reported(); 1751 } 1752 1753 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1754 if (ic->is_icholder_call()) { 1755 // The only exception is compiledICHolder oops which may 1756 // yet be marked below. (We check this further below). 1757 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1758 1759 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1760 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1761 return; 1762 } 1763 } else { 1764 Metadata* ic_oop = ic->cached_metadata(); 1765 if (ic_oop != NULL) { 1766 if (ic_oop->is_klass()) { 1767 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1768 return; 1769 } 1770 } else if (ic_oop->is_method()) { 1771 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1772 return; 1773 } 1774 } else { 1775 ShouldNotReachHere(); 1776 } 1777 } 1778 } 1779 1780 ic->set_to_clean(); 1781 } 1782 1783 // This is called at the end of the strong tracing/marking phase of a 1784 // GC to unload an nmethod if it contains otherwise unreachable 1785 // oops. 1786 1787 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1788 // Make sure the oop's ready to receive visitors 1789 assert(!is_zombie() && !is_unloaded(), 1790 "should not call follow on zombie or unloaded nmethod"); 1791 1792 // If the method is not entrant then a JMP is plastered over the 1793 // first few bytes. If an oop in the old code was there, that oop 1794 // should not get GC'd. Skip the first few bytes of oops on 1795 // not-entrant methods. 1796 address low_boundary = verified_entry_point(); 1797 if (is_not_entrant()) { 1798 low_boundary += NativeJump::instruction_size; 1799 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1800 // (See comment above.) 1801 } 1802 1803 // The RedefineClasses() API can cause the class unloading invariant 1804 // to no longer be true. See jvmtiExport.hpp for details. 1805 // Also, leave a debugging breadcrumb in local flag. 1806 if (JvmtiExport::has_redefined_a_class()) { 1807 // This set of the unloading_occurred flag is done before the 1808 // call to post_compiled_method_unload() so that the unloading 1809 // of this nmethod is reported. 1810 unloading_occurred = true; 1811 } 1812 1813 // Exception cache 1814 clean_exception_cache(is_alive); 1815 1816 // If class unloading occurred we first iterate over all inline caches and 1817 // clear ICs where the cached oop is referring to an unloaded klass or method. 1818 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1819 // iteration below. 1820 if (unloading_occurred) { 1821 RelocIterator iter(this, low_boundary); 1822 while(iter.next()) { 1823 if (iter.type() == relocInfo::virtual_call_type) { 1824 CompiledIC *ic = CompiledIC_at(&iter); 1825 clean_ic_if_metadata_is_dead(ic, is_alive); 1826 } 1827 } 1828 } 1829 1830 // Compiled code 1831 { 1832 RelocIterator iter(this, low_boundary); 1833 while (iter.next()) { 1834 if (iter.type() == relocInfo::oop_type) { 1835 oop_Relocation* r = iter.oop_reloc(); 1836 // In this loop, we must only traverse those oops directly embedded in 1837 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1838 assert(1 == (r->oop_is_immediate()) + 1839 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1840 "oop must be found in exactly one place"); 1841 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1842 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1843 return; 1844 } 1845 } 1846 } 1847 } 1848 } 1849 1850 1851 // Scopes 1852 for (oop* p = oops_begin(); p < oops_end(); p++) { 1853 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1854 if (can_unload(is_alive, p, unloading_occurred)) { 1855 return; 1856 } 1857 } 1858 1859 #if INCLUDE_JVMCI 1860 // Follow JVMCI method 1861 BarrierSet* bs = Universe::heap()->barrier_set(); 1862 if (_jvmci_installed_code != NULL) { 1863 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1864 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1865 clear_jvmci_installed_code(); 1866 } 1867 } else { 1868 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1869 return; 1870 } 1871 } 1872 } 1873 1874 if (_speculation_log != NULL) { 1875 if (!is_alive->do_object_b(_speculation_log)) { 1876 bs->write_ref_nmethod_pre(&_speculation_log, this); 1877 _speculation_log = NULL; 1878 bs->write_ref_nmethod_post(&_speculation_log, this); 1879 } 1880 } 1881 #endif 1882 1883 1884 // Ensure that all metadata is still alive 1885 verify_metadata_loaders(low_boundary, is_alive); 1886 } 1887 1888 template <class CompiledICorStaticCall> 1889 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1890 // Ok, to lookup references to zombies here 1891 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1892 if (cb != NULL && cb->is_nmethod()) { 1893 nmethod* nm = (nmethod*)cb; 1894 1895 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1896 // The nmethod has not been processed yet. 1897 return true; 1898 } 1899 1900 // Clean inline caches pointing to both zombie and not_entrant methods 1901 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1902 ic->set_to_clean(); 1903 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); 1904 } 1905 } 1906 1907 return false; 1908 } 1909 1910 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1911 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1912 } 1913 1914 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1915 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1916 } 1917 1918 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1919 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1920 1921 oop_Relocation* r = iter_at_oop->oop_reloc(); 1922 // Traverse those oops directly embedded in the code. 1923 // Other oops (oop_index>0) are seen as part of scopes_oops. 1924 assert(1 == (r->oop_is_immediate()) + 1925 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1926 "oop must be found in exactly one place"); 1927 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1928 // Unload this nmethod if the oop is dead. 1929 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1930 return true;; 1931 } 1932 } 1933 1934 return false; 1935 } 1936 1937 1938 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1939 ResourceMark rm; 1940 1941 // Make sure the oop's ready to receive visitors 1942 assert(!is_zombie() && !is_unloaded(), 1943 "should not call follow on zombie or unloaded nmethod"); 1944 1945 // If the method is not entrant then a JMP is plastered over the 1946 // first few bytes. If an oop in the old code was there, that oop 1947 // should not get GC'd. Skip the first few bytes of oops on 1948 // not-entrant methods. 1949 address low_boundary = verified_entry_point(); 1950 if (is_not_entrant()) { 1951 low_boundary += NativeJump::instruction_size; 1952 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1953 // (See comment above.) 1954 } 1955 1956 // The RedefineClasses() API can cause the class unloading invariant 1957 // to no longer be true. See jvmtiExport.hpp for details. 1958 // Also, leave a debugging breadcrumb in local flag. 1959 if (JvmtiExport::has_redefined_a_class()) { 1960 // This set of the unloading_occurred flag is done before the 1961 // call to post_compiled_method_unload() so that the unloading 1962 // of this nmethod is reported. 1963 unloading_occurred = true; 1964 } 1965 1966 // Exception cache 1967 clean_exception_cache(is_alive); 1968 1969 bool is_unloaded = false; 1970 bool postponed = false; 1971 1972 RelocIterator iter(this, low_boundary); 1973 while(iter.next()) { 1974 1975 switch (iter.type()) { 1976 1977 case relocInfo::virtual_call_type: 1978 if (unloading_occurred) { 1979 // If class unloading occurred we first iterate over all inline caches and 1980 // clear ICs where the cached oop is referring to an unloaded klass or method. 1981 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1982 } 1983 1984 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1985 break; 1986 1987 case relocInfo::opt_virtual_call_type: 1988 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1989 break; 1990 1991 case relocInfo::static_call_type: 1992 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1993 break; 1994 1995 case relocInfo::oop_type: 1996 if (!is_unloaded) { 1997 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 1998 } 1999 break; 2000 2001 case relocInfo::metadata_type: 2002 break; // nothing to do. 2003 } 2004 } 2005 2006 if (is_unloaded) { 2007 return postponed; 2008 } 2009 2010 // Scopes 2011 for (oop* p = oops_begin(); p < oops_end(); p++) { 2012 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2013 if (can_unload(is_alive, p, unloading_occurred)) { 2014 is_unloaded = true; 2015 break; 2016 } 2017 } 2018 2019 if (is_unloaded) { 2020 return postponed; 2021 } 2022 2023 #if INCLUDE_JVMCI 2024 // Follow JVMCI method 2025 BarrierSet* bs = Universe::heap()->barrier_set(); 2026 if (_jvmci_installed_code != NULL) { 2027 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 2028 if (!is_alive->do_object_b(_jvmci_installed_code)) { 2029 clear_jvmci_installed_code(); 2030 } 2031 } else { 2032 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 2033 is_unloaded = true; 2034 } 2035 } 2036 } 2037 2038 if (_speculation_log != NULL) { 2039 if (!is_alive->do_object_b(_speculation_log)) { 2040 bs->write_ref_nmethod_pre(&_speculation_log, this); 2041 _speculation_log = NULL; 2042 bs->write_ref_nmethod_post(&_speculation_log, this); 2043 } 2044 } 2045 #endif 2046 2047 // Ensure that all metadata is still alive 2048 verify_metadata_loaders(low_boundary, is_alive); 2049 2050 return postponed; 2051 } 2052 2053 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2054 ResourceMark rm; 2055 2056 // Make sure the oop's ready to receive visitors 2057 assert(!is_zombie(), 2058 "should not call follow on zombie nmethod"); 2059 2060 // If the method is not entrant then a JMP is plastered over the 2061 // first few bytes. If an oop in the old code was there, that oop 2062 // should not get GC'd. Skip the first few bytes of oops on 2063 // not-entrant methods. 2064 address low_boundary = verified_entry_point(); 2065 if (is_not_entrant()) { 2066 low_boundary += NativeJump::instruction_size; 2067 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2068 // (See comment above.) 2069 } 2070 2071 RelocIterator iter(this, low_boundary); 2072 while(iter.next()) { 2073 2074 switch (iter.type()) { 2075 2076 case relocInfo::virtual_call_type: 2077 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2078 break; 2079 2080 case relocInfo::opt_virtual_call_type: 2081 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2082 break; 2083 2084 case relocInfo::static_call_type: 2085 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2086 break; 2087 } 2088 } 2089 } 2090 2091 #ifdef ASSERT 2092 2093 class CheckClass : AllStatic { 2094 static BoolObjectClosure* _is_alive; 2095 2096 // Check class_loader is alive for this bit of metadata. 2097 static void check_class(Metadata* md) { 2098 Klass* klass = NULL; 2099 if (md->is_klass()) { 2100 klass = ((Klass*)md); 2101 } else if (md->is_method()) { 2102 klass = ((Method*)md)->method_holder(); 2103 } else if (md->is_methodData()) { 2104 klass = ((MethodData*)md)->method()->method_holder(); 2105 } else { 2106 md->print(); 2107 ShouldNotReachHere(); 2108 } 2109 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2110 } 2111 public: 2112 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2113 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2114 _is_alive = is_alive; 2115 nm->metadata_do(check_class); 2116 } 2117 }; 2118 2119 // This is called during a safepoint so can use static data 2120 BoolObjectClosure* CheckClass::_is_alive = NULL; 2121 #endif // ASSERT 2122 2123 2124 // Processing of oop references should have been sufficient to keep 2125 // all strong references alive. Any weak references should have been 2126 // cleared as well. Visit all the metadata and ensure that it's 2127 // really alive. 2128 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2129 #ifdef ASSERT 2130 RelocIterator iter(this, low_boundary); 2131 while (iter.next()) { 2132 // static_stub_Relocations may have dangling references to 2133 // Method*s so trim them out here. Otherwise it looks like 2134 // compiled code is maintaining a link to dead metadata. 2135 address static_call_addr = NULL; 2136 if (iter.type() == relocInfo::opt_virtual_call_type) { 2137 CompiledIC* cic = CompiledIC_at(&iter); 2138 if (!cic->is_call_to_interpreted()) { 2139 static_call_addr = iter.addr(); 2140 } 2141 } else if (iter.type() == relocInfo::static_call_type) { 2142 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2143 if (!csc->is_call_to_interpreted()) { 2144 static_call_addr = iter.addr(); 2145 } 2146 } 2147 if (static_call_addr != NULL) { 2148 RelocIterator sciter(this, low_boundary); 2149 while (sciter.next()) { 2150 if (sciter.type() == relocInfo::static_stub_type && 2151 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2152 sciter.static_stub_reloc()->clear_inline_cache(); 2153 } 2154 } 2155 } 2156 } 2157 // Check that the metadata embedded in the nmethod is alive 2158 CheckClass::do_check_class(is_alive, this); 2159 #endif 2160 } 2161 2162 2163 // Iterate over metadata calling this function. Used by RedefineClasses 2164 void nmethod::metadata_do(void f(Metadata*)) { 2165 address low_boundary = verified_entry_point(); 2166 if (is_not_entrant()) { 2167 low_boundary += NativeJump::instruction_size; 2168 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2169 // (See comment above.) 2170 } 2171 { 2172 // Visit all immediate references that are embedded in the instruction stream. 2173 RelocIterator iter(this, low_boundary); 2174 while (iter.next()) { 2175 if (iter.type() == relocInfo::metadata_type ) { 2176 metadata_Relocation* r = iter.metadata_reloc(); 2177 // In this metadata, we must only follow those metadatas directly embedded in 2178 // the code. Other metadatas (oop_index>0) are seen as part of 2179 // the metadata section below. 2180 assert(1 == (r->metadata_is_immediate()) + 2181 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2182 "metadata must be found in exactly one place"); 2183 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2184 Metadata* md = r->metadata_value(); 2185 if (md != _method) f(md); 2186 } 2187 } else if (iter.type() == relocInfo::virtual_call_type) { 2188 // Check compiledIC holders associated with this nmethod 2189 CompiledIC *ic = CompiledIC_at(&iter); 2190 if (ic->is_icholder_call()) { 2191 CompiledICHolder* cichk = ic->cached_icholder(); 2192 f(cichk->holder_method()); 2193 f(cichk->holder_klass()); 2194 } else { 2195 Metadata* ic_oop = ic->cached_metadata(); 2196 if (ic_oop != NULL) { 2197 f(ic_oop); 2198 } 2199 } 2200 } 2201 } 2202 } 2203 2204 // Visit the metadata section 2205 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2206 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2207 Metadata* md = *p; 2208 f(md); 2209 } 2210 2211 // Visit metadata not embedded in the other places. 2212 if (_method != NULL) f(_method); 2213 } 2214 2215 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2216 // make sure the oops ready to receive visitors 2217 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2218 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2219 2220 // If the method is not entrant or zombie then a JMP is plastered over the 2221 // first few bytes. If an oop in the old code was there, that oop 2222 // should not get GC'd. Skip the first few bytes of oops on 2223 // not-entrant methods. 2224 address low_boundary = verified_entry_point(); 2225 if (is_not_entrant()) { 2226 low_boundary += NativeJump::instruction_size; 2227 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2228 // (See comment above.) 2229 } 2230 2231 #if INCLUDE_JVMCI 2232 if (_jvmci_installed_code != NULL) { 2233 f->do_oop((oop*) &_jvmci_installed_code); 2234 } 2235 if (_speculation_log != NULL) { 2236 f->do_oop((oop*) &_speculation_log); 2237 } 2238 #endif 2239 2240 RelocIterator iter(this, low_boundary); 2241 2242 while (iter.next()) { 2243 if (iter.type() == relocInfo::oop_type ) { 2244 oop_Relocation* r = iter.oop_reloc(); 2245 // In this loop, we must only follow those oops directly embedded in 2246 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2247 assert(1 == (r->oop_is_immediate()) + 2248 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2249 "oop must be found in exactly one place"); 2250 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2251 f->do_oop(r->oop_addr()); 2252 } 2253 } 2254 } 2255 2256 // Scopes 2257 // This includes oop constants not inlined in the code stream. 2258 for (oop* p = oops_begin(); p < oops_end(); p++) { 2259 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2260 f->do_oop(p); 2261 } 2262 } 2263 2264 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2265 2266 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2267 2268 // An nmethod is "marked" if its _mark_link is set non-null. 2269 // Even if it is the end of the linked list, it will have a non-null link value, 2270 // as long as it is on the list. 2271 // This code must be MP safe, because it is used from parallel GC passes. 2272 bool nmethod::test_set_oops_do_mark() { 2273 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2274 nmethod* observed_mark_link = _oops_do_mark_link; 2275 if (observed_mark_link == NULL) { 2276 // Claim this nmethod for this thread to mark. 2277 observed_mark_link = (nmethod*) 2278 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2279 if (observed_mark_link == NULL) { 2280 2281 // Atomically append this nmethod (now claimed) to the head of the list: 2282 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2283 for (;;) { 2284 nmethod* required_mark_nmethods = observed_mark_nmethods; 2285 _oops_do_mark_link = required_mark_nmethods; 2286 observed_mark_nmethods = (nmethod*) 2287 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2288 if (observed_mark_nmethods == required_mark_nmethods) 2289 break; 2290 } 2291 // Mark was clear when we first saw this guy. 2292 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 2293 return false; 2294 } 2295 } 2296 // On fall through, another racing thread marked this nmethod before we did. 2297 return true; 2298 } 2299 2300 void nmethod::oops_do_marking_prologue() { 2301 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 2302 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2303 // We use cmpxchg_ptr instead of regular assignment here because the user 2304 // may fork a bunch of threads, and we need them all to see the same state. 2305 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2306 guarantee(observed == NULL, "no races in this sequential code"); 2307 } 2308 2309 void nmethod::oops_do_marking_epilogue() { 2310 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2311 nmethod* cur = _oops_do_mark_nmethods; 2312 while (cur != NMETHOD_SENTINEL) { 2313 assert(cur != NULL, "not NULL-terminated"); 2314 nmethod* next = cur->_oops_do_mark_link; 2315 cur->_oops_do_mark_link = NULL; 2316 DEBUG_ONLY(cur->verify_oop_relocations()); 2317 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2318 cur = next; 2319 } 2320 void* required = _oops_do_mark_nmethods; 2321 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2322 guarantee(observed == required, "no races in this sequential code"); 2323 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 2324 } 2325 2326 class DetectScavengeRoot: public OopClosure { 2327 bool _detected_scavenge_root; 2328 public: 2329 DetectScavengeRoot() : _detected_scavenge_root(false) 2330 { NOT_PRODUCT(_print_nm = NULL); } 2331 bool detected_scavenge_root() { return _detected_scavenge_root; } 2332 virtual void do_oop(oop* p) { 2333 if ((*p) != NULL && (*p)->is_scavengable()) { 2334 NOT_PRODUCT(maybe_print(p)); 2335 _detected_scavenge_root = true; 2336 } 2337 } 2338 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2339 2340 #ifndef PRODUCT 2341 nmethod* _print_nm; 2342 void maybe_print(oop* p) { 2343 if (_print_nm == NULL) return; 2344 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2345 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2346 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 2347 p2i(*p), p2i(p)); 2348 (*p)->print(); 2349 } 2350 #endif //PRODUCT 2351 }; 2352 2353 bool nmethod::detect_scavenge_root_oops() { 2354 DetectScavengeRoot detect_scavenge_root; 2355 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2356 oops_do(&detect_scavenge_root); 2357 return detect_scavenge_root.detected_scavenge_root(); 2358 } 2359 2360 // Method that knows how to preserve outgoing arguments at call. This method must be 2361 // called with a frame corresponding to a Java invoke 2362 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2363 #ifndef SHARK 2364 if (method() != NULL && !method()->is_native()) { 2365 address pc = fr.pc(); 2366 SimpleScopeDesc ssd(this, pc); 2367 Bytecode_invoke call(ssd.method(), ssd.bci()); 2368 bool has_receiver = call.has_receiver(); 2369 bool has_appendix = call.has_appendix(); 2370 Symbol* signature = call.signature(); 2371 2372 // The method attached by JIT-compilers should be used, if present. 2373 // Bytecode can be inaccurate in such case. 2374 Method* callee = attached_method_before_pc(pc); 2375 if (callee != NULL) { 2376 has_receiver = !(callee->access_flags().is_static()); 2377 has_appendix = false; 2378 signature = callee->signature(); 2379 } 2380 2381 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2382 } 2383 #endif // !SHARK 2384 } 2385 2386 inline bool includes(void* p, void* from, void* to) { 2387 return from <= p && p < to; 2388 } 2389 2390 2391 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2392 assert(count >= 2, "must be sentinel values, at least"); 2393 2394 #ifdef ASSERT 2395 // must be sorted and unique; we do a binary search in find_pc_desc() 2396 int prev_offset = pcs[0].pc_offset(); 2397 assert(prev_offset == PcDesc::lower_offset_limit, 2398 "must start with a sentinel"); 2399 for (int i = 1; i < count; i++) { 2400 int this_offset = pcs[i].pc_offset(); 2401 assert(this_offset > prev_offset, "offsets must be sorted"); 2402 prev_offset = this_offset; 2403 } 2404 assert(prev_offset == PcDesc::upper_offset_limit, 2405 "must end with a sentinel"); 2406 #endif //ASSERT 2407 2408 // Search for MethodHandle invokes and tag the nmethod. 2409 for (int i = 0; i < count; i++) { 2410 if (pcs[i].is_method_handle_invoke()) { 2411 set_has_method_handle_invokes(true); 2412 break; 2413 } 2414 } 2415 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2416 2417 int size = count * sizeof(PcDesc); 2418 assert(scopes_pcs_size() >= size, "oob"); 2419 memcpy(scopes_pcs_begin(), pcs, size); 2420 2421 // Adjust the final sentinel downward. 2422 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2423 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2424 last_pc->set_pc_offset(content_size() + 1); 2425 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2426 // Fill any rounding gaps with copies of the last record. 2427 last_pc[1] = last_pc[0]; 2428 } 2429 // The following assert could fail if sizeof(PcDesc) is not 2430 // an integral multiple of oopSize (the rounding term). 2431 // If it fails, change the logic to always allocate a multiple 2432 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2433 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2434 } 2435 2436 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2437 assert(scopes_data_size() >= size, "oob"); 2438 memcpy(scopes_data_begin(), buffer, size); 2439 } 2440 2441 // When using JVMCI the address might be off by the size of a call instruction. 2442 bool nmethod::is_deopt_entry(address pc) { 2443 return pc == deopt_handler_begin() 2444 #if INCLUDE_JVMCI 2445 || pc == (deopt_handler_begin() + NativeCall::instruction_size) 2446 #endif 2447 ; 2448 } 2449 2450 #ifdef ASSERT 2451 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2452 PcDesc* lower = nm->scopes_pcs_begin(); 2453 PcDesc* upper = nm->scopes_pcs_end(); 2454 lower += 1; // exclude initial sentinel 2455 PcDesc* res = NULL; 2456 for (PcDesc* p = lower; p < upper; p++) { 2457 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2458 if (match_desc(p, pc_offset, approximate)) { 2459 if (res == NULL) 2460 res = p; 2461 else 2462 res = (PcDesc*) badAddress; 2463 } 2464 } 2465 return res; 2466 } 2467 #endif 2468 2469 2470 // Finds a PcDesc with real-pc equal to "pc" 2471 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2472 address base_address = code_begin(); 2473 if ((pc < base_address) || 2474 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2475 return NULL; // PC is wildly out of range 2476 } 2477 int pc_offset = (int) (pc - base_address); 2478 2479 // Check the PcDesc cache if it contains the desired PcDesc 2480 // (This as an almost 100% hit rate.) 2481 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2482 if (res != NULL) { 2483 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2484 return res; 2485 } 2486 2487 // Fallback algorithm: quasi-linear search for the PcDesc 2488 // Find the last pc_offset less than the given offset. 2489 // The successor must be the required match, if there is a match at all. 2490 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2491 PcDesc* lower = scopes_pcs_begin(); 2492 PcDesc* upper = scopes_pcs_end(); 2493 upper -= 1; // exclude final sentinel 2494 if (lower >= upper) return NULL; // native method; no PcDescs at all 2495 2496 #define assert_LU_OK \ 2497 /* invariant on lower..upper during the following search: */ \ 2498 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2499 assert(upper->pc_offset() >= pc_offset, "sanity") 2500 assert_LU_OK; 2501 2502 // Use the last successful return as a split point. 2503 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2504 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2505 if (mid->pc_offset() < pc_offset) { 2506 lower = mid; 2507 } else { 2508 upper = mid; 2509 } 2510 2511 // Take giant steps at first (4096, then 256, then 16, then 1) 2512 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2513 const int RADIX = (1 << LOG2_RADIX); 2514 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2515 while ((mid = lower + step) < upper) { 2516 assert_LU_OK; 2517 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2518 if (mid->pc_offset() < pc_offset) { 2519 lower = mid; 2520 } else { 2521 upper = mid; 2522 break; 2523 } 2524 } 2525 assert_LU_OK; 2526 } 2527 2528 // Sneak up on the value with a linear search of length ~16. 2529 while (true) { 2530 assert_LU_OK; 2531 mid = lower + 1; 2532 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2533 if (mid->pc_offset() < pc_offset) { 2534 lower = mid; 2535 } else { 2536 upper = mid; 2537 break; 2538 } 2539 } 2540 #undef assert_LU_OK 2541 2542 if (match_desc(upper, pc_offset, approximate)) { 2543 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2544 _pc_desc_cache.add_pc_desc(upper); 2545 return upper; 2546 } else { 2547 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2548 return NULL; 2549 } 2550 } 2551 2552 2553 void nmethod::check_all_dependencies(DepChange& changes) { 2554 // Checked dependencies are allocated into this ResourceMark 2555 ResourceMark rm; 2556 2557 // Turn off dependency tracing while actually testing dependencies. 2558 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2559 2560 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2561 &DependencySignature::equals, 11027> DepTable; 2562 2563 DepTable* table = new DepTable(); 2564 2565 // Iterate over live nmethods and check dependencies of all nmethods that are not 2566 // marked for deoptimization. A particular dependency is only checked once. 2567 NMethodIterator iter; 2568 while(iter.next()) { 2569 nmethod* nm = iter.method(); 2570 // Only notify for live nmethods 2571 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2572 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2573 // Construct abstraction of a dependency. 2574 DependencySignature* current_sig = new DependencySignature(deps); 2575 2576 // Determine if dependency is already checked. table->put(...) returns 2577 // 'true' if the dependency is added (i.e., was not in the hashtable). 2578 if (table->put(*current_sig, 1)) { 2579 if (deps.check_dependency() != NULL) { 2580 // Dependency checking failed. Print out information about the failed 2581 // dependency and finally fail with an assert. We can fail here, since 2582 // dependency checking is never done in a product build. 2583 tty->print_cr("Failed dependency:"); 2584 changes.print(); 2585 nm->print(); 2586 nm->print_dependencies(); 2587 assert(false, "Should have been marked for deoptimization"); 2588 } 2589 } 2590 } 2591 } 2592 } 2593 } 2594 2595 bool nmethod::check_dependency_on(DepChange& changes) { 2596 // What has happened: 2597 // 1) a new class dependee has been added 2598 // 2) dependee and all its super classes have been marked 2599 bool found_check = false; // set true if we are upset 2600 for (Dependencies::DepStream deps(this); deps.next(); ) { 2601 // Evaluate only relevant dependencies. 2602 if (deps.spot_check_dependency_at(changes) != NULL) { 2603 found_check = true; 2604 NOT_DEBUG(break); 2605 } 2606 } 2607 return found_check; 2608 } 2609 2610 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2611 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2612 Array<Method*>* dependee_methods = dependee_ik->methods(); 2613 for (Dependencies::DepStream deps(this); deps.next(); ) { 2614 if (deps.type() == Dependencies::evol_method) { 2615 Method* method = deps.method_argument(0); 2616 for (int j = 0; j < dependee_methods->length(); j++) { 2617 if (dependee_methods->at(j) == method) { 2618 // RC_TRACE macro has an embedded ResourceMark 2619 RC_TRACE(0x01000000, 2620 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2621 _method->method_holder()->external_name(), 2622 _method->name()->as_C_string(), 2623 _method->signature()->as_C_string(), compile_id(), 2624 method->method_holder()->external_name(), 2625 method->name()->as_C_string(), 2626 method->signature()->as_C_string())); 2627 if (TraceDependencies || LogCompilation) 2628 deps.log_dependency(dependee); 2629 return true; 2630 } 2631 } 2632 } 2633 } 2634 return false; 2635 } 2636 2637 // Called from mark_for_deoptimization, when dependee is invalidated. 2638 bool nmethod::is_dependent_on_method(Method* dependee) { 2639 for (Dependencies::DepStream deps(this); deps.next(); ) { 2640 if (deps.type() != Dependencies::evol_method) 2641 continue; 2642 Method* method = deps.method_argument(0); 2643 if (method == dependee) return true; 2644 } 2645 return false; 2646 } 2647 2648 2649 bool nmethod::is_patchable_at(address instr_addr) { 2650 assert(insts_contains(instr_addr), "wrong nmethod used"); 2651 if (is_zombie()) { 2652 // a zombie may never be patched 2653 return false; 2654 } 2655 return true; 2656 } 2657 2658 2659 address nmethod::continuation_for_implicit_exception(address pc) { 2660 // Exception happened outside inline-cache check code => we are inside 2661 // an active nmethod => use cpc to determine a return address 2662 int exception_offset = pc - code_begin(); 2663 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2664 #ifdef ASSERT 2665 if (cont_offset == 0) { 2666 Thread* thread = Thread::current(); 2667 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2668 HandleMark hm(thread); 2669 ResourceMark rm(thread); 2670 CodeBlob* cb = CodeCache::find_blob(pc); 2671 assert(cb != NULL && cb == this, ""); 2672 ttyLocker ttyl; 2673 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2674 print(); 2675 method()->print_codes(); 2676 print_code(); 2677 print_pcs(); 2678 } 2679 #endif 2680 if (cont_offset == 0) { 2681 // Let the normal error handling report the exception 2682 return NULL; 2683 } 2684 return code_begin() + cont_offset; 2685 } 2686 2687 2688 2689 void nmethod_init() { 2690 // make sure you didn't forget to adjust the filler fields 2691 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2692 } 2693 2694 2695 //------------------------------------------------------------------------------------------- 2696 2697 2698 // QQQ might we make this work from a frame?? 2699 nmethodLocker::nmethodLocker(address pc) { 2700 CodeBlob* cb = CodeCache::find_blob(pc); 2701 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2702 _nm = (nmethod*)cb; 2703 lock_nmethod(_nm); 2704 } 2705 2706 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2707 // should pass zombie_ok == true. 2708 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2709 if (nm == NULL) return; 2710 Atomic::inc(&nm->_lock_count); 2711 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2712 } 2713 2714 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2715 if (nm == NULL) return; 2716 Atomic::dec(&nm->_lock_count); 2717 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2718 } 2719 2720 // ----------------------------------------------------------------------------- 2721 // nmethod::get_deopt_original_pc 2722 // 2723 // Return the original PC for the given PC if: 2724 // (a) the given PC belongs to a nmethod and 2725 // (b) it is a deopt PC 2726 address nmethod::get_deopt_original_pc(const frame* fr) { 2727 if (fr->cb() == NULL) return NULL; 2728 2729 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2730 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2731 return nm->get_original_pc(fr); 2732 2733 return NULL; 2734 } 2735 2736 2737 // ----------------------------------------------------------------------------- 2738 // MethodHandle 2739 2740 bool nmethod::is_method_handle_return(address return_pc) { 2741 if (!has_method_handle_invokes()) return false; 2742 PcDesc* pd = pc_desc_at(return_pc); 2743 if (pd == NULL) 2744 return false; 2745 return pd->is_method_handle_invoke(); 2746 } 2747 2748 2749 // ----------------------------------------------------------------------------- 2750 // Verification 2751 2752 class VerifyOopsClosure: public OopClosure { 2753 nmethod* _nm; 2754 bool _ok; 2755 public: 2756 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2757 bool ok() { return _ok; } 2758 virtual void do_oop(oop* p) { 2759 if ((*p) == NULL || (*p)->is_oop()) return; 2760 if (_ok) { 2761 _nm->print_nmethod(true); 2762 _ok = false; 2763 } 2764 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2765 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2766 } 2767 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2768 }; 2769 2770 void nmethod::verify() { 2771 2772 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2773 // seems odd. 2774 2775 if (is_zombie() || is_not_entrant() || is_unloaded()) 2776 return; 2777 2778 // Make sure all the entry points are correctly aligned for patching. 2779 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2780 2781 // assert(method()->is_oop(), "must be valid"); 2782 2783 ResourceMark rm; 2784 2785 if (!CodeCache::contains(this)) { 2786 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2787 } 2788 2789 if(is_native_method() ) 2790 return; 2791 2792 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2793 if (nm != this) { 2794 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2795 } 2796 2797 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2798 if (! p->verify(this)) { 2799 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2800 } 2801 } 2802 2803 VerifyOopsClosure voc(this); 2804 oops_do(&voc); 2805 assert(voc.ok(), "embedded oops must be OK"); 2806 verify_scavenge_root_oops(); 2807 2808 verify_scopes(); 2809 } 2810 2811 2812 void nmethod::verify_interrupt_point(address call_site) { 2813 // Verify IC only when nmethod installation is finished. 2814 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2815 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2816 if (is_installed) { 2817 Thread *cur = Thread::current(); 2818 if (CompiledIC_lock->owner() == cur || 2819 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2820 SafepointSynchronize::is_at_safepoint())) { 2821 CompiledIC_at(this, call_site); 2822 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2823 } else { 2824 MutexLocker ml_verify (CompiledIC_lock); 2825 CompiledIC_at(this, call_site); 2826 } 2827 } 2828 2829 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2830 assert(pd != NULL, "PcDesc must exist"); 2831 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2832 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2833 pd->return_oop()); 2834 !sd->is_top(); sd = sd->sender()) { 2835 sd->verify(); 2836 } 2837 } 2838 2839 void nmethod::verify_scopes() { 2840 if( !method() ) return; // Runtime stubs have no scope 2841 if (method()->is_native()) return; // Ignore stub methods. 2842 // iterate through all interrupt point 2843 // and verify the debug information is valid. 2844 RelocIterator iter((nmethod*)this); 2845 while (iter.next()) { 2846 address stub = NULL; 2847 switch (iter.type()) { 2848 case relocInfo::virtual_call_type: 2849 verify_interrupt_point(iter.addr()); 2850 break; 2851 case relocInfo::opt_virtual_call_type: 2852 stub = iter.opt_virtual_call_reloc()->static_stub(); 2853 verify_interrupt_point(iter.addr()); 2854 break; 2855 case relocInfo::static_call_type: 2856 stub = iter.static_call_reloc()->static_stub(); 2857 //verify_interrupt_point(iter.addr()); 2858 break; 2859 case relocInfo::runtime_call_type: 2860 address destination = iter.reloc()->value(); 2861 // Right now there is no way to find out which entries support 2862 // an interrupt point. It would be nice if we had this 2863 // information in a table. 2864 break; 2865 } 2866 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2867 } 2868 } 2869 2870 2871 // ----------------------------------------------------------------------------- 2872 // Non-product code 2873 #ifndef PRODUCT 2874 2875 class DebugScavengeRoot: public OopClosure { 2876 nmethod* _nm; 2877 bool _ok; 2878 public: 2879 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2880 bool ok() { return _ok; } 2881 virtual void do_oop(oop* p) { 2882 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2883 if (_ok) { 2884 _nm->print_nmethod(true); 2885 _ok = false; 2886 } 2887 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2888 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2889 (*p)->print(); 2890 } 2891 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2892 }; 2893 2894 void nmethod::verify_scavenge_root_oops() { 2895 if (UseG1GC) { 2896 return; 2897 } 2898 2899 if (!on_scavenge_root_list()) { 2900 // Actually look inside, to verify the claim that it's clean. 2901 DebugScavengeRoot debug_scavenge_root(this); 2902 oops_do(&debug_scavenge_root); 2903 if (!debug_scavenge_root.ok()) 2904 fatal("found an unadvertised bad scavengable oop in the code cache"); 2905 } 2906 assert(scavenge_root_not_marked(), ""); 2907 } 2908 2909 #endif // PRODUCT 2910 2911 // Printing operations 2912 2913 void nmethod::print() const { 2914 ResourceMark rm; 2915 ttyLocker ttyl; // keep the following output all in one block 2916 2917 tty->print("Compiled method "); 2918 2919 if (is_compiled_by_c1()) { 2920 tty->print("(c1) "); 2921 } else if (is_compiled_by_c2()) { 2922 tty->print("(c2) "); 2923 } else if (is_compiled_by_shark()) { 2924 tty->print("(shark) "); 2925 } else if (is_compiled_by_jvmci()) { 2926 tty->print("(JVMCI) "); 2927 } else { 2928 tty->print("(nm) "); 2929 } 2930 2931 print_on(tty, NULL); 2932 2933 if (WizardMode) { 2934 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2935 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2936 tty->print(" { "); 2937 tty->print_cr("%s ", state()); 2938 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2939 tty->print_cr("}:"); 2940 } 2941 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2942 p2i(this), 2943 p2i(this) + size(), 2944 size()); 2945 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2946 p2i(relocation_begin()), 2947 p2i(relocation_end()), 2948 relocation_size()); 2949 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2950 p2i(consts_begin()), 2951 p2i(consts_end()), 2952 consts_size()); 2953 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2954 p2i(insts_begin()), 2955 p2i(insts_end()), 2956 insts_size()); 2957 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2958 p2i(stub_begin()), 2959 p2i(stub_end()), 2960 stub_size()); 2961 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2962 p2i(oops_begin()), 2963 p2i(oops_end()), 2964 oops_size()); 2965 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2966 p2i(metadata_begin()), 2967 p2i(metadata_end()), 2968 metadata_size()); 2969 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2970 p2i(scopes_data_begin()), 2971 p2i(scopes_data_end()), 2972 scopes_data_size()); 2973 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2974 p2i(scopes_pcs_begin()), 2975 p2i(scopes_pcs_end()), 2976 scopes_pcs_size()); 2977 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2978 p2i(dependencies_begin()), 2979 p2i(dependencies_end()), 2980 dependencies_size()); 2981 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2982 p2i(handler_table_begin()), 2983 p2i(handler_table_end()), 2984 handler_table_size()); 2985 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2986 p2i(nul_chk_table_begin()), 2987 p2i(nul_chk_table_end()), 2988 nul_chk_table_size()); 2989 } 2990 2991 #ifndef PRODUCT 2992 2993 void nmethod::print_scopes() { 2994 // Find the first pc desc for all scopes in the code and print it. 2995 ResourceMark rm; 2996 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2997 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2998 continue; 2999 3000 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 3001 while (sd != NULL) { 3002 sd->print_on(tty, p); 3003 sd = sd->sender(); 3004 } 3005 } 3006 } 3007 3008 void nmethod::print_dependencies() { 3009 ResourceMark rm; 3010 ttyLocker ttyl; // keep the following output all in one block 3011 tty->print_cr("Dependencies:"); 3012 for (Dependencies::DepStream deps(this); deps.next(); ) { 3013 deps.print_dependency(); 3014 Klass* ctxk = deps.context_type(); 3015 if (ctxk != NULL) { 3016 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 3017 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 3018 } 3019 } 3020 deps.log_dependency(); // put it into the xml log also 3021 } 3022 } 3023 3024 3025 void nmethod::print_relocations() { 3026 ResourceMark m; // in case methods get printed via the debugger 3027 tty->print_cr("relocations:"); 3028 RelocIterator iter(this); 3029 iter.print(); 3030 if (UseRelocIndex) { 3031 jint* index_end = (jint*)relocation_end() - 1; 3032 jint index_size = *index_end; 3033 jint* index_start = (jint*)( (address)index_end - index_size ); 3034 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 3035 if (index_size > 0) { 3036 jint* ip; 3037 for (ip = index_start; ip+2 <= index_end; ip += 2) 3038 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 3039 ip[0], 3040 ip[1], 3041 p2i(header_end()+ip[0]), 3042 p2i(relocation_begin()-1+ip[1])); 3043 for (; ip < index_end; ip++) 3044 tty->print_cr(" (%d ?)", ip[0]); 3045 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 3046 ip++; 3047 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 3048 } 3049 } 3050 } 3051 3052 3053 void nmethod::print_pcs() { 3054 ResourceMark m; // in case methods get printed via debugger 3055 tty->print_cr("pc-bytecode offsets:"); 3056 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3057 p->print(this); 3058 } 3059 } 3060 3061 void nmethod::print_recorded_oops() { 3062 tty->print_cr("Recorded oops:"); 3063 for (int i = 0; i < oops_count(); i++) { 3064 oop o = oop_at(i); 3065 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 3066 if (o == (oop)Universe::non_oop_word()) { 3067 tty->print("non-oop word"); 3068 } else { 3069 o->print_value(); 3070 } 3071 tty->cr(); 3072 } 3073 } 3074 3075 void nmethod::print_recorded_metadata() { 3076 tty->print_cr("Recorded metadata:"); 3077 for (int i = 0; i < metadata_count(); i++) { 3078 Metadata* m = metadata_at(i); 3079 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 3080 if (m == (Metadata*)Universe::non_oop_word()) { 3081 tty->print("non-metadata word"); 3082 } else { 3083 m->print_value_on_maybe_null(tty); 3084 } 3085 tty->cr(); 3086 } 3087 } 3088 3089 #endif // PRODUCT 3090 3091 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3092 RelocIterator iter(this, begin, end); 3093 bool have_one = false; 3094 while (iter.next()) { 3095 have_one = true; 3096 switch (iter.type()) { 3097 case relocInfo::none: return "no_reloc"; 3098 case relocInfo::oop_type: { 3099 stringStream st; 3100 oop_Relocation* r = iter.oop_reloc(); 3101 oop obj = r->oop_value(); 3102 st.print("oop("); 3103 if (obj == NULL) st.print("NULL"); 3104 else obj->print_value_on(&st); 3105 st.print(")"); 3106 return st.as_string(); 3107 } 3108 case relocInfo::metadata_type: { 3109 stringStream st; 3110 metadata_Relocation* r = iter.metadata_reloc(); 3111 Metadata* obj = r->metadata_value(); 3112 st.print("metadata("); 3113 if (obj == NULL) st.print("NULL"); 3114 else obj->print_value_on(&st); 3115 st.print(")"); 3116 return st.as_string(); 3117 } 3118 case relocInfo::runtime_call_type: { 3119 stringStream st; 3120 st.print("runtime_call"); 3121 runtime_call_Relocation* r = iter.runtime_call_reloc(); 3122 address dest = r->destination(); 3123 CodeBlob* cb = CodeCache::find_blob(dest); 3124 if (cb != NULL) { 3125 st.print(" %s", cb->name()); 3126 } else { 3127 ResourceMark rm; 3128 const int buflen = 1024; 3129 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 3130 int offset; 3131 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 3132 st.print(" %s", buf); 3133 if (offset != 0) { 3134 st.print("+%d", offset); 3135 } 3136 } 3137 } 3138 return st.as_string(); 3139 } 3140 case relocInfo::virtual_call_type: { 3141 stringStream st; 3142 st.print_raw("virtual_call"); 3143 virtual_call_Relocation* r = iter.virtual_call_reloc(); 3144 Method* m = r->method_value(); 3145 if (m != NULL) { 3146 assert(m->is_method(), ""); 3147 m->print_short_name(&st); 3148 } 3149 return st.as_string(); 3150 } 3151 case relocInfo::opt_virtual_call_type: { 3152 stringStream st; 3153 st.print_raw("optimized virtual_call"); 3154 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 3155 Method* m = r->method_value(); 3156 if (m != NULL) { 3157 assert(m->is_method(), ""); 3158 m->print_short_name(&st); 3159 } 3160 return st.as_string(); 3161 } 3162 case relocInfo::static_call_type: { 3163 stringStream st; 3164 st.print_raw("static_call"); 3165 static_call_Relocation* r = iter.static_call_reloc(); 3166 Method* m = r->method_value(); 3167 if (m != NULL) { 3168 assert(m->is_method(), ""); 3169 m->print_short_name(&st); 3170 } 3171 return st.as_string(); 3172 } 3173 case relocInfo::static_stub_type: return "static_stub"; 3174 case relocInfo::external_word_type: return "external_word"; 3175 case relocInfo::internal_word_type: return "internal_word"; 3176 case relocInfo::section_word_type: return "section_word"; 3177 case relocInfo::poll_type: return "poll"; 3178 case relocInfo::poll_return_type: return "poll_return"; 3179 case relocInfo::type_mask: return "type_bit_mask"; 3180 } 3181 } 3182 return have_one ? "other" : NULL; 3183 } 3184 3185 // Return a the last scope in (begin..end] 3186 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3187 PcDesc* p = pc_desc_near(begin+1); 3188 if (p != NULL && p->real_pc(this) <= end) { 3189 return new ScopeDesc(this, p->scope_decode_offset(), 3190 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3191 p->return_oop()); 3192 } 3193 return NULL; 3194 } 3195 3196 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3197 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3198 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3199 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3200 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3201 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3202 3203 if (has_method_handle_invokes()) 3204 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3205 3206 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3207 3208 if (block_begin == entry_point()) { 3209 methodHandle m = method(); 3210 if (m.not_null()) { 3211 stream->print(" # "); 3212 m->print_value_on(stream); 3213 stream->cr(); 3214 } 3215 if (m.not_null() && !is_osr_method()) { 3216 ResourceMark rm; 3217 int sizeargs = m->size_of_parameters(); 3218 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3219 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3220 { 3221 int sig_index = 0; 3222 if (!m->is_static()) 3223 sig_bt[sig_index++] = T_OBJECT; // 'this' 3224 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3225 BasicType t = ss.type(); 3226 sig_bt[sig_index++] = t; 3227 if (type2size[t] == 2) { 3228 sig_bt[sig_index++] = T_VOID; 3229 } else { 3230 assert(type2size[t] == 1, "size is 1 or 2"); 3231 } 3232 } 3233 assert(sig_index == sizeargs, ""); 3234 } 3235 const char* spname = "sp"; // make arch-specific? 3236 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3237 int stack_slot_offset = this->frame_size() * wordSize; 3238 int tab1 = 14, tab2 = 24; 3239 int sig_index = 0; 3240 int arg_index = (m->is_static() ? 0 : -1); 3241 bool did_old_sp = false; 3242 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3243 bool at_this = (arg_index == -1); 3244 bool at_old_sp = false; 3245 BasicType t = (at_this ? T_OBJECT : ss.type()); 3246 assert(t == sig_bt[sig_index], "sigs in sync"); 3247 if (at_this) 3248 stream->print(" # this: "); 3249 else 3250 stream->print(" # parm%d: ", arg_index); 3251 stream->move_to(tab1); 3252 VMReg fst = regs[sig_index].first(); 3253 VMReg snd = regs[sig_index].second(); 3254 if (fst->is_reg()) { 3255 stream->print("%s", fst->name()); 3256 if (snd->is_valid()) { 3257 stream->print(":%s", snd->name()); 3258 } 3259 } else if (fst->is_stack()) { 3260 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3261 if (offset == stack_slot_offset) at_old_sp = true; 3262 stream->print("[%s+0x%x]", spname, offset); 3263 } else { 3264 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3265 } 3266 stream->print(" "); 3267 stream->move_to(tab2); 3268 stream->print("= "); 3269 if (at_this) { 3270 m->method_holder()->print_value_on(stream); 3271 } else { 3272 bool did_name = false; 3273 if (!at_this && ss.is_object()) { 3274 Symbol* name = ss.as_symbol_or_null(); 3275 if (name != NULL) { 3276 name->print_value_on(stream); 3277 did_name = true; 3278 } 3279 } 3280 if (!did_name) 3281 stream->print("%s", type2name(t)); 3282 } 3283 if (at_old_sp) { 3284 stream->print(" (%s of caller)", spname); 3285 did_old_sp = true; 3286 } 3287 stream->cr(); 3288 sig_index += type2size[t]; 3289 arg_index += 1; 3290 if (!at_this) ss.next(); 3291 } 3292 if (!did_old_sp) { 3293 stream->print(" # "); 3294 stream->move_to(tab1); 3295 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3296 stream->print(" (%s of caller)", spname); 3297 stream->cr(); 3298 } 3299 } 3300 } 3301 } 3302 3303 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3304 // First, find an oopmap in (begin, end]. 3305 // We use the odd half-closed interval so that oop maps and scope descs 3306 // which are tied to the byte after a call are printed with the call itself. 3307 address base = code_begin(); 3308 ImmutableOopMapSet* oms = oop_maps(); 3309 if (oms != NULL) { 3310 for (int i = 0, imax = oms->count(); i < imax; i++) { 3311 const ImmutableOopMapPair* pair = oms->pair_at(i); 3312 const ImmutableOopMap* om = pair->get_from(oms); 3313 address pc = base + pair->pc_offset(); 3314 if (pc > begin) { 3315 if (pc <= end) { 3316 st->move_to(column); 3317 st->print("; "); 3318 om->print_on(st); 3319 } 3320 break; 3321 } 3322 } 3323 } 3324 3325 // Print any debug info present at this pc. 3326 ScopeDesc* sd = scope_desc_in(begin, end); 3327 if (sd != NULL) { 3328 st->move_to(column); 3329 if (sd->bci() == SynchronizationEntryBCI) { 3330 st->print(";*synchronization entry"); 3331 } else { 3332 if (sd->method() == NULL) { 3333 st->print("method is NULL"); 3334 } else if (sd->method()->is_native()) { 3335 st->print("method is native"); 3336 } else { 3337 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3338 st->print(";*%s", Bytecodes::name(bc)); 3339 switch (bc) { 3340 case Bytecodes::_invokevirtual: 3341 case Bytecodes::_invokespecial: 3342 case Bytecodes::_invokestatic: 3343 case Bytecodes::_invokeinterface: 3344 { 3345 Bytecode_invoke invoke(sd->method(), sd->bci()); 3346 st->print(" "); 3347 if (invoke.name() != NULL) 3348 invoke.name()->print_symbol_on(st); 3349 else 3350 st->print("<UNKNOWN>"); 3351 break; 3352 } 3353 case Bytecodes::_getfield: 3354 case Bytecodes::_putfield: 3355 case Bytecodes::_getstatic: 3356 case Bytecodes::_putstatic: 3357 { 3358 Bytecode_field field(sd->method(), sd->bci()); 3359 st->print(" "); 3360 if (field.name() != NULL) 3361 field.name()->print_symbol_on(st); 3362 else 3363 st->print("<UNKNOWN>"); 3364 } 3365 } 3366 } 3367 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3368 } 3369 3370 // Print all scopes 3371 for (;sd != NULL; sd = sd->sender()) { 3372 st->move_to(column); 3373 st->print("; -"); 3374 if (sd->method() == NULL) { 3375 st->print("method is NULL"); 3376 } else { 3377 sd->method()->print_short_name(st); 3378 } 3379 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3380 if (lineno != -1) { 3381 st->print("@%d (line %d)", sd->bci(), lineno); 3382 } else { 3383 st->print("@%d", sd->bci()); 3384 } 3385 st->cr(); 3386 } 3387 } 3388 3389 // Print relocation information 3390 const char* str = reloc_string_for(begin, end); 3391 if (str != NULL) { 3392 if (sd != NULL) st->cr(); 3393 st->move_to(column); 3394 st->print("; {%s}", str); 3395 } 3396 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3397 if (cont_offset != 0) { 3398 st->move_to(column); 3399 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3400 } 3401 3402 } 3403 3404 #ifndef PRODUCT 3405 3406 void nmethod::print_value_on(outputStream* st) const { 3407 st->print("nmethod"); 3408 print_on(st, NULL); 3409 } 3410 3411 void nmethod::print_calls(outputStream* st) { 3412 RelocIterator iter(this); 3413 while (iter.next()) { 3414 switch (iter.type()) { 3415 case relocInfo::virtual_call_type: 3416 case relocInfo::opt_virtual_call_type: { 3417 VerifyMutexLocker mc(CompiledIC_lock); 3418 CompiledIC_at(&iter)->print(); 3419 break; 3420 } 3421 case relocInfo::static_call_type: 3422 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3423 compiledStaticCall_at(iter.reloc())->print(); 3424 break; 3425 } 3426 } 3427 } 3428 3429 void nmethod::print_handler_table() { 3430 ExceptionHandlerTable(this).print(); 3431 } 3432 3433 void nmethod::print_nul_chk_table() { 3434 ImplicitExceptionTable(this).print(code_begin()); 3435 } 3436 3437 void nmethod::print_statistics() { 3438 ttyLocker ttyl; 3439 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3440 native_nmethod_stats.print_native_nmethod_stats(); 3441 #ifdef COMPILER1 3442 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3443 #endif 3444 #ifdef COMPILER2 3445 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3446 #endif 3447 #if INCLUDE_JVMCI 3448 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3449 #endif 3450 #ifdef SHARK 3451 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 3452 #endif 3453 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3454 DebugInformationRecorder::print_statistics(); 3455 #ifndef PRODUCT 3456 pc_nmethod_stats.print_pc_stats(); 3457 #endif 3458 Dependencies::print_statistics(); 3459 if (xtty != NULL) xtty->tail("statistics"); 3460 } 3461 3462 #endif // !PRODUCT 3463 3464 #if INCLUDE_JVMCI 3465 void nmethod::clear_jvmci_installed_code() { 3466 // write_ref_method_pre/post can only be safely called at a 3467 // safepoint or while holding the CodeCache_lock 3468 assert(CodeCache_lock->is_locked() || 3469 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 3470 if (_jvmci_installed_code != NULL) { 3471 // This must be done carefully to maintain nmethod remembered sets properly 3472 BarrierSet* bs = Universe::heap()->barrier_set(); 3473 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 3474 _jvmci_installed_code = NULL; 3475 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 3476 } 3477 } 3478 3479 void nmethod::maybe_invalidate_installed_code() { 3480 assert(Patching_lock->is_locked() || 3481 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 3482 oop installed_code = jvmci_installed_code(); 3483 if (installed_code != NULL) { 3484 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 3485 if (nm == NULL || nm != this) { 3486 // The link has been broken or the InstalledCode instance is 3487 // associated with another nmethod so do nothing. 3488 return; 3489 } 3490 if (!is_alive()) { 3491 // Break the link between nmethod and InstalledCode such that the nmethod 3492 // can subsequently be flushed safely. The link must be maintained while 3493 // the method could have live activations since invalidateInstalledCode 3494 // might want to invalidate all existing activations. 3495 InstalledCode::set_address(installed_code, 0); 3496 InstalledCode::set_entryPoint(installed_code, 0); 3497 } else if (is_not_entrant()) { 3498 // Remove the entry point so any invocation will fail but keep 3499 // the address link around that so that existing activations can 3500 // be invalidated. 3501 InstalledCode::set_entryPoint(installed_code, 0); 3502 } 3503 } 3504 } 3505 3506 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 3507 if (installedCode() == NULL) { 3508 THROW(vmSymbols::java_lang_NullPointerException()); 3509 } 3510 jlong nativeMethod = InstalledCode::address(installedCode); 3511 nmethod* nm = (nmethod*)nativeMethod; 3512 if (nm == NULL) { 3513 // Nothing to do 3514 return; 3515 } 3516 3517 nmethodLocker nml(nm); 3518 #ifdef ASSERT 3519 { 3520 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 3521 // This relationship can only be checked safely under a lock 3522 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 3523 } 3524 #endif 3525 3526 if (nm->is_alive()) { 3527 // The nmethod state machinery maintains the link between the 3528 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 3529 // alive assume there is work to do and deoptimize the nmethod. 3530 nm->mark_for_deoptimization(); 3531 VM_Deoptimize op; 3532 VMThread::execute(&op); 3533 } 3534 3535 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 3536 // Check that it's still associated with the same nmethod and break 3537 // the link if it is. 3538 if (InstalledCode::address(installedCode) == nativeMethod) { 3539 InstalledCode::set_address(installedCode, 0); 3540 } 3541 } 3542 3543 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 3544 if (!this->is_compiled_by_jvmci()) { 3545 return NULL; 3546 } 3547 oop installedCode = this->jvmci_installed_code(); 3548 if (installedCode != NULL) { 3549 oop installedCodeName = NULL; 3550 if (installedCode->is_a(InstalledCode::klass())) { 3551 installedCodeName = InstalledCode::name(installedCode); 3552 } 3553 if (installedCodeName != NULL) { 3554 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3555 } else { 3556 jio_snprintf(buf, buflen, "null"); 3557 return buf; 3558 } 3559 } 3560 jio_snprintf(buf, buflen, "noInstalledCode"); 3561 return buf; 3562 } 3563 #endif 3564 3565 Method* nmethod::attached_method(address call_instr) { 3566 assert(code_contains(call_instr), "not part of the nmethod"); 3567 RelocIterator iter(this, call_instr, call_instr + 1); 3568 while (iter.next()) { 3569 if (iter.addr() == call_instr) { 3570 switch(iter.type()) { 3571 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value(); 3572 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value(); 3573 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value(); 3574 } 3575 } 3576 } 3577 return NULL; // not found 3578 } 3579 3580 Method* nmethod::attached_method_before_pc(address pc) { 3581 if (NativeCall::is_call_before(pc)) { 3582 NativeCall* ncall = nativeCall_before(pc); 3583 return attached_method(ncall->instruction_address()); 3584 } 3585 return NULL; // not a call 3586 } 3587