1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/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/compilerOracle.hpp" 36 #include "compiler/disassembler.hpp" 37 #include "interpreter/bytecode.hpp" 38 #include "oops/methodData.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "prims/jvmtiRedefineClassesTrace.hpp" 41 #include "prims/jvmtiImpl.hpp" 42 #include "runtime/atomic.inline.hpp" 43 #include "runtime/orderAccess.inline.hpp" 44 #include "runtime/sharedRuntime.hpp" 45 #include "runtime/sweeper.hpp" 46 #include "utilities/resourceHash.hpp" 47 #include "utilities/dtrace.hpp" 48 #include "utilities/events.hpp" 49 #include "utilities/xmlstream.hpp" 50 #ifdef TARGET_ARCH_x86 51 # include "nativeInst_x86.hpp" 52 #endif 53 #ifdef TARGET_ARCH_sparc 54 # include "nativeInst_sparc.hpp" 55 #endif 56 #ifdef TARGET_ARCH_zero 57 # include "nativeInst_zero.hpp" 58 #endif 59 #ifdef TARGET_ARCH_arm 60 # include "nativeInst_arm.hpp" 61 #endif 62 #ifdef TARGET_ARCH_ppc 63 # include "nativeInst_ppc.hpp" 64 #endif 65 #ifdef SHARK 66 #include "shark/sharkCompiler.hpp" 67 #endif 68 #if INCLUDE_JVMCI 69 #include "jvmci/jvmciJavaClasses.hpp" 70 #endif 71 72 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 73 74 unsigned char nmethod::_global_unloading_clock = 0; 75 76 #ifdef DTRACE_ENABLED 77 78 // Only bother with this argument setup if dtrace is available 79 80 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 81 { \ 82 Method* m = (method); \ 83 if (m != NULL) { \ 84 Symbol* klass_name = m->klass_name(); \ 85 Symbol* name = m->name(); \ 86 Symbol* signature = m->signature(); \ 87 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 88 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 89 (char *) name->bytes(), name->utf8_length(), \ 90 (char *) signature->bytes(), signature->utf8_length()); \ 91 } \ 92 } 93 94 #else // ndef DTRACE_ENABLED 95 96 #define DTRACE_METHOD_UNLOAD_PROBE(method) 97 98 #endif 99 100 bool nmethod::is_compiled_by_c1() const { 101 if (compiler() == NULL) { 102 return false; 103 } 104 return compiler()->is_c1(); 105 } 106 bool nmethod::is_compiled_by_jvmci() const { 107 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 108 if (is_native_method()) return false; 109 return compiler()->is_jvmci(); 110 } 111 bool nmethod::is_compiled_by_c2() const { 112 if (compiler() == NULL) { 113 return false; 114 } 115 return compiler()->is_c2(); 116 } 117 bool nmethod::is_compiled_by_shark() const { 118 if (compiler() == NULL) { 119 return false; 120 } 121 return compiler()->is_shark(); 122 } 123 124 125 126 //--------------------------------------------------------------------------------- 127 // NMethod statistics 128 // They are printed under various flags, including: 129 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 130 // (In the latter two cases, they like other stats are printed to the log only.) 131 132 #ifndef PRODUCT 133 // These variables are put into one block to reduce relocations 134 // and make it simpler to print from the debugger. 135 struct java_nmethod_stats_struct { 136 int nmethod_count; 137 int total_size; 138 int relocation_size; 139 int consts_size; 140 int insts_size; 141 int stub_size; 142 int scopes_data_size; 143 int scopes_pcs_size; 144 int dependencies_size; 145 int handler_table_size; 146 int nul_chk_table_size; 147 int oops_size; 148 int metadata_size; 149 150 void note_nmethod(nmethod* nm) { 151 nmethod_count += 1; 152 total_size += nm->size(); 153 relocation_size += nm->relocation_size(); 154 consts_size += nm->consts_size(); 155 insts_size += nm->insts_size(); 156 stub_size += nm->stub_size(); 157 oops_size += nm->oops_size(); 158 metadata_size += nm->metadata_size(); 159 scopes_data_size += nm->scopes_data_size(); 160 scopes_pcs_size += nm->scopes_pcs_size(); 161 dependencies_size += nm->dependencies_size(); 162 handler_table_size += nm->handler_table_size(); 163 nul_chk_table_size += nm->nul_chk_table_size(); 164 } 165 void print_nmethod_stats(const char* name) { 166 if (nmethod_count == 0) return; 167 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 168 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 169 if (nmethod_count != 0) tty->print_cr(" header = %d", nmethod_count * sizeof(nmethod)); 170 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 171 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 172 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 173 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 174 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 175 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 176 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 177 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 178 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 179 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 180 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 181 } 182 }; 183 184 struct native_nmethod_stats_struct { 185 int native_nmethod_count; 186 int native_total_size; 187 int native_relocation_size; 188 int native_insts_size; 189 int native_oops_size; 190 int native_metadata_size; 191 void note_native_nmethod(nmethod* nm) { 192 native_nmethod_count += 1; 193 native_total_size += nm->size(); 194 native_relocation_size += nm->relocation_size(); 195 native_insts_size += nm->insts_size(); 196 native_oops_size += nm->oops_size(); 197 native_metadata_size += nm->metadata_size(); 198 } 199 void print_native_nmethod_stats() { 200 if (native_nmethod_count == 0) return; 201 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 202 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 203 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 204 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 205 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 206 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 207 } 208 }; 209 210 struct pc_nmethod_stats_struct { 211 int pc_desc_resets; // number of resets (= number of caches) 212 int pc_desc_queries; // queries to nmethod::find_pc_desc 213 int pc_desc_approx; // number of those which have approximate true 214 int pc_desc_repeats; // number of _pc_descs[0] hits 215 int pc_desc_hits; // number of LRU cache hits 216 int pc_desc_tests; // total number of PcDesc examinations 217 int pc_desc_searches; // total number of quasi-binary search steps 218 int pc_desc_adds; // number of LUR cache insertions 219 220 void print_pc_stats() { 221 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 222 pc_desc_queries, 223 (double)(pc_desc_tests + pc_desc_searches) 224 / pc_desc_queries); 225 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 226 pc_desc_resets, 227 pc_desc_queries, pc_desc_approx, 228 pc_desc_repeats, pc_desc_hits, 229 pc_desc_tests, pc_desc_searches, pc_desc_adds); 230 } 231 }; 232 233 #ifdef COMPILER1 234 static java_nmethod_stats_struct c1_java_nmethod_stats; 235 #endif 236 #ifdef COMPILER2 237 static java_nmethod_stats_struct c2_java_nmethod_stats; 238 #endif 239 #if INCLUDE_JVMCI 240 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 241 #endif 242 #ifdef SHARK 243 static java_nmethod_stats_struct shark_java_nmethod_stats; 244 #endif 245 static java_nmethod_stats_struct unknown_java_nmethod_stats; 246 247 static native_nmethod_stats_struct native_nmethod_stats; 248 static pc_nmethod_stats_struct pc_nmethod_stats; 249 250 static void note_java_nmethod(nmethod* nm) { 251 #ifdef COMPILER1 252 if (nm->is_compiled_by_c1()) { 253 c1_java_nmethod_stats.note_nmethod(nm); 254 } else 255 #endif 256 #ifdef COMPILER2 257 if (nm->is_compiled_by_c2()) { 258 c2_java_nmethod_stats.note_nmethod(nm); 259 } else 260 #endif 261 #if INCLUDE_JVMCI 262 if (nm->is_compiled_by_jvmci()) { 263 jvmci_java_nmethod_stats.note_nmethod(nm); 264 } else 265 #endif 266 #ifdef SHARK 267 if (nm->is_compiled_by_shark()) { 268 shark_java_nmethod_stats.note_nmethod(nm); 269 } else 270 #endif 271 { 272 unknown_java_nmethod_stats.note_nmethod(nm); 273 } 274 } 275 #endif // !PRODUCT 276 277 //--------------------------------------------------------------------------------- 278 279 280 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 281 assert(pc != NULL, "Must be non null"); 282 assert(exception.not_null(), "Must be non null"); 283 assert(handler != NULL, "Must be non null"); 284 285 _count = 0; 286 _exception_type = exception->klass(); 287 _next = NULL; 288 289 add_address_and_handler(pc,handler); 290 } 291 292 293 address ExceptionCache::match(Handle exception, address pc) { 294 assert(pc != NULL,"Must be non null"); 295 assert(exception.not_null(),"Must be non null"); 296 if (exception->klass() == exception_type()) { 297 return (test_address(pc)); 298 } 299 300 return NULL; 301 } 302 303 304 bool ExceptionCache::match_exception_with_space(Handle exception) { 305 assert(exception.not_null(),"Must be non null"); 306 if (exception->klass() == exception_type() && count() < cache_size) { 307 return true; 308 } 309 return false; 310 } 311 312 313 address ExceptionCache::test_address(address addr) { 314 for (int i=0; i<count(); i++) { 315 if (pc_at(i) == addr) { 316 return handler_at(i); 317 } 318 } 319 return NULL; 320 } 321 322 323 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 324 if (test_address(addr) == handler) return true; 325 if (count() < cache_size) { 326 set_pc_at(count(),addr); 327 set_handler_at(count(), handler); 328 increment_count(); 329 return true; 330 } 331 return false; 332 } 333 334 335 // private method for handling exception cache 336 // These methods are private, and used to manipulate the exception cache 337 // directly. 338 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 339 ExceptionCache* ec = exception_cache(); 340 while (ec != NULL) { 341 if (ec->match_exception_with_space(exception)) { 342 return ec; 343 } 344 ec = ec->next(); 345 } 346 return NULL; 347 } 348 349 350 //----------------------------------------------------------------------------- 351 352 353 // Helper used by both find_pc_desc methods. 354 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 355 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 356 if (!approximate) 357 return pc->pc_offset() == pc_offset; 358 else 359 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 360 } 361 362 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 363 if (initial_pc_desc == NULL) { 364 _pc_descs[0] = NULL; // native method; no PcDescs at all 365 return; 366 } 367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 368 // reset the cache by filling it with benign (non-null) values 369 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 370 for (int i = 0; i < cache_size; i++) 371 _pc_descs[i] = initial_pc_desc; 372 } 373 374 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 375 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 376 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 377 378 // Note: one might think that caching the most recently 379 // read value separately would be a win, but one would be 380 // wrong. When many threads are updating it, the cache 381 // line it's in would bounce between caches, negating 382 // any benefit. 383 384 // In order to prevent race conditions do not load cache elements 385 // repeatedly, but use a local copy: 386 PcDesc* res; 387 388 // Step one: Check the most recently added value. 389 res = _pc_descs[0]; 390 if (res == NULL) return NULL; // native method; no PcDescs at all 391 if (match_desc(res, pc_offset, approximate)) { 392 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 393 return res; 394 } 395 396 // Step two: Check the rest of the LRU cache. 397 for (int i = 1; i < cache_size; ++i) { 398 res = _pc_descs[i]; 399 if (res->pc_offset() < 0) break; // optimization: skip empty cache 400 if (match_desc(res, pc_offset, approximate)) { 401 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 402 return res; 403 } 404 } 405 406 // Report failure. 407 return NULL; 408 } 409 410 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 411 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 412 // Update the LRU cache by shifting pc_desc forward. 413 for (int i = 0; i < cache_size; i++) { 414 PcDesc* next = _pc_descs[i]; 415 _pc_descs[i] = pc_desc; 416 pc_desc = next; 417 } 418 } 419 420 // adjust pcs_size so that it is a multiple of both oopSize and 421 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 422 // of oopSize, then 2*sizeof(PcDesc) is) 423 static int adjust_pcs_size(int pcs_size) { 424 int nsize = round_to(pcs_size, oopSize); 425 if ((nsize % sizeof(PcDesc)) != 0) { 426 nsize = pcs_size + sizeof(PcDesc); 427 } 428 assert((nsize % oopSize) == 0, "correct alignment"); 429 return nsize; 430 } 431 432 //----------------------------------------------------------------------------- 433 434 435 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 436 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 437 assert(new_entry != NULL,"Must be non null"); 438 assert(new_entry->next() == NULL, "Must be null"); 439 440 if (exception_cache() != NULL) { 441 new_entry->set_next(exception_cache()); 442 } 443 set_exception_cache(new_entry); 444 } 445 446 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 447 ExceptionCache* prev = NULL; 448 ExceptionCache* curr = exception_cache(); 449 450 while (curr != NULL) { 451 ExceptionCache* next = curr->next(); 452 453 Klass* ex_klass = curr->exception_type(); 454 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 455 if (prev == NULL) { 456 set_exception_cache(next); 457 } else { 458 prev->set_next(next); 459 } 460 delete curr; 461 // prev stays the same. 462 } else { 463 prev = curr; 464 } 465 466 curr = next; 467 } 468 } 469 470 // public method for accessing the exception cache 471 // These are the public access methods. 472 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 473 // We never grab a lock to read the exception cache, so we may 474 // have false negatives. This is okay, as it can only happen during 475 // the first few exception lookups for a given nmethod. 476 ExceptionCache* ec = exception_cache(); 477 while (ec != NULL) { 478 address ret_val; 479 if ((ret_val = ec->match(exception,pc)) != NULL) { 480 return ret_val; 481 } 482 ec = ec->next(); 483 } 484 return NULL; 485 } 486 487 488 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 489 // There are potential race conditions during exception cache updates, so we 490 // must own the ExceptionCache_lock before doing ANY modifications. Because 491 // we don't lock during reads, it is possible to have several threads attempt 492 // to update the cache with the same data. We need to check for already inserted 493 // copies of the current data before adding it. 494 495 MutexLocker ml(ExceptionCache_lock); 496 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 497 498 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 499 target_entry = new ExceptionCache(exception,pc,handler); 500 add_exception_cache_entry(target_entry); 501 } 502 } 503 504 505 //-------------end of code for ExceptionCache-------------- 506 507 508 int nmethod::total_size() const { 509 return 510 consts_size() + 511 insts_size() + 512 stub_size() + 513 scopes_data_size() + 514 scopes_pcs_size() + 515 handler_table_size() + 516 nul_chk_table_size(); 517 } 518 519 const char* nmethod::compile_kind() const { 520 if (is_osr_method()) return "osr"; 521 if (method() != NULL && is_native_method()) return "c2n"; 522 return NULL; 523 } 524 525 // Fill in default values for various flag fields 526 void nmethod::init_defaults() { 527 _state = in_use; 528 _unloading_clock = 0; 529 _marked_for_reclamation = 0; 530 _has_flushed_dependencies = 0; 531 _has_unsafe_access = 0; 532 _has_method_handle_invokes = 0; 533 _lazy_critical_native = 0; 534 _has_wide_vectors = 0; 535 _marked_for_deoptimization = 0; 536 _lock_count = 0; 537 _stack_traversal_mark = 0; 538 _unload_reported = false; // jvmti state 539 540 #ifdef ASSERT 541 _oops_are_stale = false; 542 #endif 543 544 _oops_do_mark_link = NULL; 545 _jmethod_id = NULL; 546 _osr_link = NULL; 547 if (UseG1GC) { 548 _unloading_next = NULL; 549 } else { 550 _scavenge_root_link = NULL; 551 } 552 _scavenge_root_state = 0; 553 _compiler = NULL; 554 #if INCLUDE_RTM_OPT 555 _rtm_state = NoRTM; 556 #endif 557 #if INCLUDE_JVMCI 558 _jvmci_installed_code = NULL; 559 _speculation_log = NULL; 560 #endif 561 } 562 563 nmethod* nmethod::new_native_nmethod(methodHandle method, 564 int compile_id, 565 CodeBuffer *code_buffer, 566 int vep_offset, 567 int frame_complete, 568 int frame_size, 569 ByteSize basic_lock_owner_sp_offset, 570 ByteSize basic_lock_sp_offset, 571 OopMapSet* oop_maps) { 572 code_buffer->finalize_oop_references(method); 573 // create nmethod 574 nmethod* nm = NULL; 575 { 576 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 577 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 578 CodeOffsets offsets; 579 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 580 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 581 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 582 compile_id, &offsets, 583 code_buffer, frame_size, 584 basic_lock_owner_sp_offset, 585 basic_lock_sp_offset, oop_maps); 586 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 587 if ((PrintAssembly || CompilerOracle::should_print(method)) && nm != NULL) { 588 Disassembler::decode(nm); 589 } 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(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 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 672 Disassembler::decode(nm); 673 } 674 } 675 } 676 // Do verification and logging outside CodeCache_lock. 677 if (nm != NULL) { 678 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 679 DEBUG_ONLY(nm->verify();) 680 nm->log_new_nmethod(); 681 } 682 return nm; 683 } 684 685 #ifdef _MSC_VER 686 #pragma warning(push) 687 #pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list 688 #endif 689 // For native wrappers 690 nmethod::nmethod( 691 Method* method, 692 int nmethod_size, 693 int compile_id, 694 CodeOffsets* offsets, 695 CodeBuffer* code_buffer, 696 int frame_size, 697 ByteSize basic_lock_owner_sp_offset, 698 ByteSize basic_lock_sp_offset, 699 OopMapSet* oop_maps ) 700 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 701 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 702 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 703 _native_basic_lock_sp_offset(basic_lock_sp_offset) 704 { 705 { 706 debug_only(No_Safepoint_Verifier nsv;) 707 assert_locked_or_safepoint(CodeCache_lock); 708 709 init_defaults(); 710 _method = method; 711 _entry_bci = InvocationEntryBci; 712 // We have no exception handler or deopt handler make the 713 // values something that will never match a pc like the nmethod vtable entry 714 _exception_offset = 0; 715 _deoptimize_offset = 0; 716 _deoptimize_mh_offset = 0; 717 _orig_pc_offset = 0; 718 719 _consts_offset = data_offset(); 720 _stub_offset = data_offset(); 721 _oops_offset = data_offset(); 722 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 723 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 724 _scopes_pcs_offset = _scopes_data_offset; 725 _dependencies_offset = _scopes_pcs_offset; 726 _handler_table_offset = _dependencies_offset; 727 _nul_chk_table_offset = _handler_table_offset; 728 _nmethod_end_offset = _nul_chk_table_offset; 729 _compile_id = compile_id; 730 _comp_level = CompLevel_none; 731 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 732 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 733 _osr_entry_point = NULL; 734 _exception_cache = NULL; 735 _pc_desc_cache.reset_to(NULL); 736 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 737 738 code_buffer->copy_values_to(this); 739 if (ScavengeRootsInCode) { 740 if (detect_scavenge_root_oops()) { 741 CodeCache::add_scavenge_root_nmethod(this); 742 } 743 Universe::heap()->register_nmethod(this); 744 } 745 debug_only(verify_scavenge_root_oops()); 746 CodeCache::commit(this); 747 } 748 749 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 750 ttyLocker ttyl; // keep the following output all in one block 751 // This output goes directly to the tty, not the compiler log. 752 // To enable tools to match it up with the compilation activity, 753 // be sure to tag this tty output with the compile ID. 754 if (xtty != NULL) { 755 xtty->begin_head("print_native_nmethod"); 756 xtty->method(_method); 757 xtty->stamp(); 758 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 759 } 760 // print the header part first 761 print(); 762 // then print the requested information 763 if (PrintNativeNMethods) { 764 print_code(); 765 if (oop_maps != NULL) { 766 oop_maps->print(); 767 } 768 } 769 if (PrintRelocations) { 770 print_relocations(); 771 } 772 if (xtty != NULL) { 773 xtty->tail("print_native_nmethod"); 774 } 775 } 776 } 777 778 #ifdef _MSC_VER 779 #pragma warning(pop) 780 #endif 781 782 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 783 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 784 } 785 786 nmethod::nmethod( 787 Method* method, 788 int nmethod_size, 789 int compile_id, 790 int entry_bci, 791 CodeOffsets* offsets, 792 int orig_pc_offset, 793 DebugInformationRecorder* debug_info, 794 Dependencies* dependencies, 795 CodeBuffer *code_buffer, 796 int frame_size, 797 OopMapSet* oop_maps, 798 ExceptionHandlerTable* handler_table, 799 ImplicitExceptionTable* nul_chk_table, 800 AbstractCompiler* compiler, 801 int comp_level 802 #if INCLUDE_JVMCI 803 , Handle installed_code, 804 Handle speculation_log 805 #endif 806 ) 807 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 808 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 809 _native_receiver_sp_offset(in_ByteSize(-1)), 810 _native_basic_lock_sp_offset(in_ByteSize(-1)) 811 { 812 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 813 { 814 debug_only(No_Safepoint_Verifier nsv;) 815 assert_locked_or_safepoint(CodeCache_lock); 816 817 init_defaults(); 818 _method = method; 819 _entry_bci = entry_bci; 820 _compile_id = compile_id; 821 _comp_level = comp_level; 822 _compiler = compiler; 823 _orig_pc_offset = orig_pc_offset; 824 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 825 826 // Section offsets 827 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 828 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 829 830 #if INCLUDE_JVMCI 831 _jvmci_installed_code = installed_code(); 832 _speculation_log = (instanceOop)speculation_log(); 833 834 if (compiler->is_jvmci()) { 835 // JVMCI might not produce any stub sections 836 if (offsets->value(CodeOffsets::Exceptions) != -1) { 837 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 838 } else { 839 _exception_offset = -1; 840 } 841 if (offsets->value(CodeOffsets::Deopt) != -1) { 842 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 843 } else { 844 _deoptimize_offset = -1; 845 } 846 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 847 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 848 } else { 849 _deoptimize_mh_offset = -1; 850 } 851 } else { 852 #endif 853 // Exception handler and deopt handler are in the stub section 854 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 855 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 856 857 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 858 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 859 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 860 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 861 } else { 862 _deoptimize_mh_offset = -1; 863 #if INCLUDE_JVMCI 864 } 865 #endif 866 } 867 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 868 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 869 } else { 870 _unwind_handler_offset = -1; 871 } 872 873 _oops_offset = data_offset(); 874 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 875 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 876 877 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 878 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 879 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 880 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 881 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 882 883 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 884 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 885 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 886 _exception_cache = NULL; 887 _pc_desc_cache.reset_to(scopes_pcs_begin()); 888 889 // Copy contents of ScopeDescRecorder to nmethod 890 code_buffer->copy_values_to(this); 891 debug_info->copy_to(this); 892 dependencies->copy_to(this); 893 if (ScavengeRootsInCode) { 894 if (detect_scavenge_root_oops()) { 895 CodeCache::add_scavenge_root_nmethod(this); 896 } 897 Universe::heap()->register_nmethod(this); 898 } 899 debug_only(verify_scavenge_root_oops()); 900 901 CodeCache::commit(this); 902 903 // Copy contents of ExceptionHandlerTable to nmethod 904 handler_table->copy_to(this); 905 nul_chk_table->copy_to(this); 906 907 // we use the information of entry points to find out if a method is 908 // static or non static 909 assert(compiler->is_c2() || compiler->is_jvmci() || 910 _method->is_static() == (entry_point() == _verified_entry_point), 911 " entry points must be same for static methods and vice versa"); 912 } 913 914 bool printnmethods = PrintNMethods || PrintNMethodsAtLevel == _comp_level 915 || CompilerOracle::should_print(_method) 916 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 917 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 918 print_nmethod(printnmethods); 919 } 920 } 921 922 // Print a short set of xml attributes to identify this nmethod. The 923 // output should be embedded in some other element. 924 void nmethod::log_identity(xmlStream* log) const { 925 log->print(" compile_id='%d'", compile_id()); 926 const char* nm_kind = compile_kind(); 927 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 928 if (compiler() != NULL) { 929 log->print(" compiler='%s'", compiler()->name()); 930 } 931 if (TieredCompilation) { 932 log->print(" level='%d'", comp_level()); 933 } 934 } 935 936 937 #define LOG_OFFSET(log, name) \ 938 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 939 log->print(" " XSTR(name) "_offset='%d'" , \ 940 (intptr_t)name##_begin() - (intptr_t)this) 941 942 943 void nmethod::log_new_nmethod() const { 944 if (LogCompilation && xtty != NULL) { 945 ttyLocker ttyl; 946 HandleMark hm; 947 xtty->begin_elem("nmethod"); 948 log_identity(xtty); 949 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 950 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 951 952 LOG_OFFSET(xtty, relocation); 953 LOG_OFFSET(xtty, consts); 954 LOG_OFFSET(xtty, insts); 955 LOG_OFFSET(xtty, stub); 956 LOG_OFFSET(xtty, scopes_data); 957 LOG_OFFSET(xtty, scopes_pcs); 958 LOG_OFFSET(xtty, dependencies); 959 LOG_OFFSET(xtty, handler_table); 960 LOG_OFFSET(xtty, nul_chk_table); 961 LOG_OFFSET(xtty, oops); 962 LOG_OFFSET(xtty, metadata); 963 964 xtty->method(method()); 965 xtty->stamp(); 966 xtty->end_elem(); 967 } 968 } 969 970 #undef LOG_OFFSET 971 972 973 // Print out more verbose output usually for a newly created nmethod. 974 void nmethod::print_on(outputStream* st, const char* msg) const { 975 if (st != NULL) { 976 ttyLocker ttyl; 977 if (WizardMode) { 978 CompileTask::print(st, this, msg, /*short_form:*/ true); 979 st->print_cr(" (" INTPTR_FORMAT ")", this); 980 } else { 981 CompileTask::print(st, this, msg, /*short_form:*/ false); 982 } 983 } 984 } 985 986 987 void nmethod::print_nmethod(bool printmethod) { 988 ttyLocker ttyl; // keep the following output all in one block 989 if (xtty != NULL) { 990 xtty->begin_head("print_nmethod"); 991 xtty->stamp(); 992 xtty->end_head(); 993 } 994 // print the header part first 995 print(); 996 // then print the requested information 997 if (printmethod) { 998 print_code(); 999 print_pcs(); 1000 if (oop_maps()) { 1001 oop_maps()->print(); 1002 } 1003 } 1004 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 1005 print_scopes(); 1006 } 1007 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 1008 print_relocations(); 1009 } 1010 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 1011 print_dependencies(); 1012 } 1013 if (PrintExceptionHandlers) { 1014 print_handler_table(); 1015 print_nul_chk_table(); 1016 } 1017 if (xtty != NULL) { 1018 xtty->tail("print_nmethod"); 1019 } 1020 } 1021 1022 1023 // Promote one word from an assembly-time handle to a live embedded oop. 1024 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1025 if (handle == NULL || 1026 // As a special case, IC oops are initialized to 1 or -1. 1027 handle == (jobject) Universe::non_oop_word()) { 1028 (*dest) = (oop) handle; 1029 } else { 1030 (*dest) = JNIHandles::resolve_non_null(handle); 1031 } 1032 } 1033 1034 1035 // Have to have the same name because it's called by a template 1036 void nmethod::copy_values(GrowableArray<jobject>* array) { 1037 int length = array->length(); 1038 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1039 oop* dest = oops_begin(); 1040 for (int index = 0 ; index < length; index++) { 1041 initialize_immediate_oop(&dest[index], array->at(index)); 1042 } 1043 1044 // Now we can fix up all the oops in the code. We need to do this 1045 // in the code because the assembler uses jobjects as placeholders. 1046 // The code and relocations have already been initialized by the 1047 // CodeBlob constructor, so it is valid even at this early point to 1048 // iterate over relocations and patch the code. 1049 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1050 } 1051 1052 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1053 int length = array->length(); 1054 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1055 Metadata** dest = metadata_begin(); 1056 for (int index = 0 ; index < length; index++) { 1057 dest[index] = array->at(index); 1058 } 1059 } 1060 1061 bool nmethod::is_at_poll_return(address pc) { 1062 RelocIterator iter(this, pc, pc+1); 1063 while (iter.next()) { 1064 if (iter.type() == relocInfo::poll_return_type) 1065 return true; 1066 } 1067 return false; 1068 } 1069 1070 1071 bool nmethod::is_at_poll_or_poll_return(address pc) { 1072 RelocIterator iter(this, pc, pc+1); 1073 while (iter.next()) { 1074 relocInfo::relocType t = iter.type(); 1075 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1076 return true; 1077 } 1078 return false; 1079 } 1080 1081 1082 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1083 // re-patch all oop-bearing instructions, just in case some oops moved 1084 RelocIterator iter(this, begin, end); 1085 while (iter.next()) { 1086 if (iter.type() == relocInfo::oop_type) { 1087 oop_Relocation* reloc = iter.oop_reloc(); 1088 if (initialize_immediates && reloc->oop_is_immediate()) { 1089 oop* dest = reloc->oop_addr(); 1090 initialize_immediate_oop(dest, (jobject) *dest); 1091 } 1092 // Refresh the oop-related bits of this instruction. 1093 reloc->fix_oop_relocation(); 1094 } else if (iter.type() == relocInfo::metadata_type) { 1095 metadata_Relocation* reloc = iter.metadata_reloc(); 1096 reloc->fix_metadata_relocation(); 1097 } 1098 } 1099 } 1100 1101 1102 void nmethod::verify_oop_relocations() { 1103 // Ensure sure that the code matches the current oop values 1104 RelocIterator iter(this, NULL, NULL); 1105 while (iter.next()) { 1106 if (iter.type() == relocInfo::oop_type) { 1107 oop_Relocation* reloc = iter.oop_reloc(); 1108 if (!reloc->oop_is_immediate()) { 1109 reloc->verify_oop_relocation(); 1110 } 1111 } 1112 } 1113 } 1114 1115 1116 ScopeDesc* nmethod::scope_desc_at(address pc) { 1117 PcDesc* pd = pc_desc_at(pc); 1118 guarantee(pd != NULL, "scope must be present"); 1119 return new ScopeDesc(this, pd->scope_decode_offset(), 1120 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 1121 pd->return_oop()); 1122 } 1123 1124 1125 void nmethod::clear_inline_caches() { 1126 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1127 if (is_zombie()) { 1128 return; 1129 } 1130 1131 RelocIterator iter(this); 1132 while (iter.next()) { 1133 iter.reloc()->clear_inline_cache(); 1134 } 1135 } 1136 1137 // Clear ICStubs of all compiled ICs 1138 void nmethod::clear_ic_stubs() { 1139 assert_locked_or_safepoint(CompiledIC_lock); 1140 RelocIterator iter(this); 1141 while(iter.next()) { 1142 if (iter.type() == relocInfo::virtual_call_type) { 1143 CompiledIC* ic = CompiledIC_at(&iter); 1144 ic->clear_ic_stub(); 1145 } 1146 } 1147 } 1148 1149 1150 void nmethod::cleanup_inline_caches() { 1151 assert_locked_or_safepoint(CompiledIC_lock); 1152 1153 // If the method is not entrant or zombie then a JMP is plastered over the 1154 // first few bytes. If an oop in the old code was there, that oop 1155 // should not get GC'd. Skip the first few bytes of oops on 1156 // not-entrant methods. 1157 address low_boundary = verified_entry_point(); 1158 if (!is_in_use()) { 1159 low_boundary += NativeJump::instruction_size; 1160 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1161 // This means that the low_boundary is going to be a little too high. 1162 // This shouldn't matter, since oops of non-entrant methods are never used. 1163 // In fact, why are we bothering to look at oops in a non-entrant method?? 1164 } 1165 1166 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1167 // zombie and unloaded nmethods. 1168 ResourceMark rm; 1169 RelocIterator iter(this, low_boundary); 1170 while(iter.next()) { 1171 switch(iter.type()) { 1172 case relocInfo::virtual_call_type: 1173 case relocInfo::opt_virtual_call_type: { 1174 CompiledIC *ic = CompiledIC_at(&iter); 1175 // Ok, to lookup references to zombies here 1176 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1177 if( cb != NULL && cb->is_nmethod() ) { 1178 nmethod* nm = (nmethod*)cb; 1179 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1180 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1181 } 1182 break; 1183 } 1184 case relocInfo::static_call_type: { 1185 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1186 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1187 if( cb != NULL && cb->is_nmethod() ) { 1188 nmethod* nm = (nmethod*)cb; 1189 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1190 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1191 } 1192 break; 1193 } 1194 } 1195 } 1196 } 1197 1198 void nmethod::verify_clean_inline_caches() { 1199 assert_locked_or_safepoint(CompiledIC_lock); 1200 1201 // If the method is not entrant or zombie then a JMP is plastered over the 1202 // first few bytes. If an oop in the old code was there, that oop 1203 // should not get GC'd. Skip the first few bytes of oops on 1204 // not-entrant methods. 1205 address low_boundary = verified_entry_point(); 1206 if (!is_in_use()) { 1207 low_boundary += NativeJump::instruction_size; 1208 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1209 // This means that the low_boundary is going to be a little too high. 1210 // This shouldn't matter, since oops of non-entrant methods are never used. 1211 // In fact, why are we bothering to look at oops in a non-entrant method?? 1212 } 1213 1214 ResourceMark rm; 1215 RelocIterator iter(this, low_boundary); 1216 while(iter.next()) { 1217 switch(iter.type()) { 1218 case relocInfo::virtual_call_type: 1219 case relocInfo::opt_virtual_call_type: { 1220 CompiledIC *ic = CompiledIC_at(&iter); 1221 // Ok, to lookup references to zombies here 1222 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1223 if( cb != NULL && cb->is_nmethod() ) { 1224 nmethod* nm = (nmethod*)cb; 1225 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1226 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1227 assert(ic->is_clean(), "IC should be clean"); 1228 } 1229 } 1230 break; 1231 } 1232 case relocInfo::static_call_type: { 1233 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1234 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1235 if( cb != NULL && cb->is_nmethod() ) { 1236 nmethod* nm = (nmethod*)cb; 1237 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1238 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1239 assert(csc->is_clean(), "IC should be clean"); 1240 } 1241 } 1242 break; 1243 } 1244 } 1245 } 1246 } 1247 1248 int nmethod::verify_icholder_relocations() { 1249 int count = 0; 1250 1251 RelocIterator iter(this); 1252 while(iter.next()) { 1253 if (iter.type() == relocInfo::virtual_call_type) { 1254 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1255 CompiledIC *ic = CompiledIC_at(&iter); 1256 if (TraceCompiledIC) { 1257 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1258 ic->print(); 1259 } 1260 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1261 count++; 1262 } 1263 } 1264 } 1265 1266 return count; 1267 } 1268 1269 // This is a private interface with the sweeper. 1270 void nmethod::mark_as_seen_on_stack() { 1271 assert(is_alive(), "Must be an alive method"); 1272 // Set the traversal mark to ensure that the sweeper does 2 1273 // cleaning passes before moving to zombie. 1274 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1275 } 1276 1277 // Tell if a non-entrant method can be converted to a zombie (i.e., 1278 // there are no activations on the stack, not in use by the VM, 1279 // and not in use by the ServiceThread) 1280 bool nmethod::can_convert_to_zombie() { 1281 assert(is_not_entrant(), "must be a non-entrant method"); 1282 1283 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1284 // count can be greater than the stack traversal count before it hits the 1285 // nmethod for the second time. 1286 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1287 !is_locked_by_vm(); 1288 } 1289 1290 void nmethod::inc_decompile_count() { 1291 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1292 // Could be gated by ProfileTraps, but do not bother... 1293 Method* m = method(); 1294 if (m == NULL) return; 1295 MethodData* mdo = m->method_data(); 1296 if (mdo == NULL) return; 1297 // There is a benign race here. See comments in methodData.hpp. 1298 mdo->inc_decompile_count(); 1299 } 1300 1301 void nmethod::increase_unloading_clock() { 1302 _global_unloading_clock++; 1303 if (_global_unloading_clock == 0) { 1304 // _nmethods are allocated with _unloading_clock == 0, 1305 // so 0 is never used as a clock value. 1306 _global_unloading_clock = 1; 1307 } 1308 } 1309 1310 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1311 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1312 } 1313 1314 unsigned char nmethod::unloading_clock() { 1315 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1316 } 1317 1318 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1319 1320 post_compiled_method_unload(); 1321 1322 // Since this nmethod is being unloaded, make sure that dependencies 1323 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1324 // indicate that this work is being done during a GC. 1325 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1326 assert(is_alive != NULL, "Should be non-NULL"); 1327 // A non-NULL is_alive closure indicates that this is being called during GC. 1328 flush_dependencies(is_alive); 1329 1330 // Break cycle between nmethod & method 1331 if (TraceClassUnloading && WizardMode) { 1332 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1333 " unloadable], Method*(" INTPTR_FORMAT 1334 "), cause(" INTPTR_FORMAT ")", 1335 this, (address)_method, (address)cause); 1336 if (!Universe::heap()->is_gc_active()) 1337 cause->klass()->print(); 1338 } 1339 // Unlink the osr method, so we do not look this up again 1340 if (is_osr_method()) { 1341 invalidate_osr_method(); 1342 } 1343 // If _method is already NULL the Method* is about to be unloaded, 1344 // so we don't have to break the cycle. Note that it is possible to 1345 // have the Method* live here, in case we unload the nmethod because 1346 // it is pointing to some oop (other than the Method*) being unloaded. 1347 if (_method != NULL) { 1348 // OSR methods point to the Method*, but the Method* does not 1349 // point back! 1350 if (_method->code() == this) { 1351 _method->clear_code(); // Break a cycle 1352 } 1353 _method = NULL; // Clear the method of this dead nmethod 1354 } 1355 1356 // Make the class unloaded - i.e., change state and notify sweeper 1357 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1358 if (is_in_use()) { 1359 // Transitioning directly from live to unloaded -- so 1360 // we need to force a cache clean-up; remember this 1361 // for later on. 1362 CodeCache::set_needs_cache_clean(true); 1363 } 1364 1365 // Unregister must be done before the state change 1366 Universe::heap()->unregister_nmethod(this); 1367 1368 #if INCLUDE_JVMCI 1369 // The method can only be unloaded after the pointer to the installed code 1370 // Java wrapper is no longer alive. Here we need to clear out this weak 1371 // reference to the dead object. Nulling out the reference has to happen 1372 // after the method is unregistered since the original value may be still 1373 // tracked by the rset. 1374 if (_jvmci_installed_code != NULL) { 1375 InstalledCode::set_address(_jvmci_installed_code, 0); 1376 _jvmci_installed_code = NULL; 1377 } 1378 #endif 1379 1380 _state = unloaded; 1381 1382 // Log the unloading. 1383 log_state_change(); 1384 1385 // The Method* is gone at this point 1386 assert(_method == NULL, "Tautology"); 1387 1388 set_osr_link(NULL); 1389 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1390 NMethodSweeper::report_state_change(this); 1391 } 1392 1393 void nmethod::invalidate_osr_method() { 1394 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1395 // Remove from list of active nmethods 1396 if (method() != NULL) 1397 method()->method_holder()->remove_osr_nmethod(this); 1398 } 1399 1400 void nmethod::log_state_change() const { 1401 if (LogCompilation) { 1402 if (xtty != NULL) { 1403 ttyLocker ttyl; // keep the following output all in one block 1404 if (_state == unloaded) { 1405 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1406 os::current_thread_id()); 1407 } else { 1408 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1409 os::current_thread_id(), 1410 (_state == zombie ? " zombie='1'" : "")); 1411 } 1412 log_identity(xtty); 1413 xtty->stamp(); 1414 xtty->end_elem(); 1415 } 1416 } 1417 if (PrintCompilation && _state != unloaded) { 1418 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1419 } 1420 } 1421 1422 /** 1423 * Common functionality for both make_not_entrant and make_zombie 1424 */ 1425 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1426 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1427 assert(!is_zombie(), "should not already be a zombie"); 1428 1429 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1430 nmethodLocker nml(this); 1431 methodHandle the_method(method()); 1432 No_Safepoint_Verifier nsv; 1433 1434 // during patching, depending on the nmethod state we must notify the GC that 1435 // code has been unloaded, unregistering it. We cannot do this right while 1436 // holding the Patching_lock because we need to use the CodeCache_lock. This 1437 // would be prone to deadlocks. 1438 // This flag is used to remember whether we need to later lock and unregister. 1439 bool nmethod_needs_unregister = false; 1440 1441 { 1442 // invalidate osr nmethod before acquiring the patching lock since 1443 // they both acquire leaf locks and we don't want a deadlock. 1444 // This logic is equivalent to the logic below for patching the 1445 // verified entry point of regular methods. 1446 if (is_osr_method()) { 1447 // this effectively makes the osr nmethod not entrant 1448 invalidate_osr_method(); 1449 } 1450 1451 // Enter critical section. Does not block for safepoint. 1452 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1453 1454 if (_state == state) { 1455 // another thread already performed this transition so nothing 1456 // to do, but return false to indicate this. 1457 return false; 1458 } 1459 1460 // The caller can be calling the method statically or through an inline 1461 // cache call. 1462 if (!is_osr_method() && !is_not_entrant()) { 1463 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1464 SharedRuntime::get_handle_wrong_method_stub()); 1465 } 1466 1467 if (is_in_use()) { 1468 // It's a true state change, so mark the method as decompiled. 1469 // Do it only for transition from alive. 1470 inc_decompile_count(); 1471 } 1472 1473 // If the state is becoming a zombie, signal to unregister the nmethod with 1474 // the heap. 1475 // This nmethod may have already been unloaded during a full GC. 1476 if ((state == zombie) && !is_unloaded()) { 1477 nmethod_needs_unregister = true; 1478 } 1479 1480 // Must happen before state change. Otherwise we have a race condition in 1481 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1482 // transition its state from 'not_entrant' to 'zombie' without having to wait 1483 // for stack scanning. 1484 if (state == not_entrant) { 1485 mark_as_seen_on_stack(); 1486 OrderAccess::storestore(); 1487 } 1488 1489 // Change state 1490 _state = state; 1491 1492 // Log the transition once 1493 log_state_change(); 1494 1495 // Remove nmethod from method. 1496 // We need to check if both the _code and _from_compiled_code_entry_point 1497 // refer to this nmethod because there is a race in setting these two fields 1498 // in Method* as seen in bugid 4947125. 1499 // If the vep() points to the zombie nmethod, the memory for the nmethod 1500 // could be flushed and the compiler and vtable stubs could still call 1501 // through it. 1502 if (method() != NULL && (method()->code() == this || 1503 method()->from_compiled_entry() == verified_entry_point())) { 1504 HandleMark hm; 1505 method()->clear_code(); 1506 } 1507 } // leave critical region under Patching_lock 1508 1509 // When the nmethod becomes zombie it is no longer alive so the 1510 // dependencies must be flushed. nmethods in the not_entrant 1511 // state will be flushed later when the transition to zombie 1512 // happens or they get unloaded. 1513 if (state == zombie) { 1514 { 1515 // Flushing dependecies must be done before any possible 1516 // safepoint can sneak in, otherwise the oops used by the 1517 // dependency logic could have become stale. 1518 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1519 if (nmethod_needs_unregister) { 1520 Universe::heap()->unregister_nmethod(this); 1521 } 1522 flush_dependencies(NULL); 1523 } 1524 1525 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1526 // event and it hasn't already been reported for this nmethod then 1527 // report it now. The event may have been reported earilier if the GC 1528 // marked it for unloading). JvmtiDeferredEventQueue support means 1529 // we no longer go to a safepoint here. 1530 post_compiled_method_unload(); 1531 1532 #ifdef ASSERT 1533 // It's no longer safe to access the oops section since zombie 1534 // nmethods aren't scanned for GC. 1535 _oops_are_stale = true; 1536 #endif 1537 // the Method may be reclaimed by class unloading now that the 1538 // nmethod is in zombie state 1539 set_method(NULL); 1540 } else { 1541 assert(state == not_entrant, "other cases may need to be handled differently"); 1542 } 1543 #if INCLUDE_JVMCI 1544 if (_jvmci_installed_code != NULL) { 1545 // Break the link between nmethod and InstalledCode such that the nmethod can subsequently be flushed safely. 1546 InstalledCode::set_address(_jvmci_installed_code, 0); 1547 } 1548 #endif 1549 1550 if (TraceCreateZombies) { 1551 ResourceMark m; 1552 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", this, this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); 1553 } 1554 1555 NMethodSweeper::report_state_change(this); 1556 return true; 1557 } 1558 1559 void nmethod::flush() { 1560 // Note that there are no valid oops in the nmethod anymore. 1561 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1562 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1563 1564 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1565 assert_locked_or_safepoint(CodeCache_lock); 1566 1567 // completely deallocate this method 1568 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1569 if (PrintMethodFlushing) { 1570 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1571 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1572 } 1573 1574 // We need to deallocate any ExceptionCache data. 1575 // Note that we do not need to grab the nmethod lock for this, it 1576 // better be thread safe if we're disposing of it! 1577 ExceptionCache* ec = exception_cache(); 1578 set_exception_cache(NULL); 1579 while(ec != NULL) { 1580 ExceptionCache* next = ec->next(); 1581 delete ec; 1582 ec = next; 1583 } 1584 1585 if (on_scavenge_root_list()) { 1586 CodeCache::drop_scavenge_root_nmethod(this); 1587 } 1588 1589 #ifdef SHARK 1590 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1591 #endif // SHARK 1592 1593 ((CodeBlob*)(this))->flush(); 1594 1595 CodeCache::free(this); 1596 } 1597 1598 // 1599 // Notify all classes this nmethod is dependent on that it is no 1600 // longer dependent. This should only be called in two situations. 1601 // First, when a nmethod transitions to a zombie all dependents need 1602 // to be clear. Since zombification happens at a safepoint there's no 1603 // synchronization issues. The second place is a little more tricky. 1604 // During phase 1 of mark sweep class unloading may happen and as a 1605 // result some nmethods may get unloaded. In this case the flushing 1606 // of dependencies must happen during phase 1 since after GC any 1607 // dependencies in the unloaded nmethod won't be updated, so 1608 // traversing the dependency information in unsafe. In that case this 1609 // function is called with a non-NULL argument and this function only 1610 // notifies instanceKlasses that are reachable 1611 1612 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1613 assert_locked_or_safepoint(CodeCache_lock); 1614 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1615 "is_alive is non-NULL if and only if we are called during GC"); 1616 if (!has_flushed_dependencies()) { 1617 set_has_flushed_dependencies(); 1618 for (Dependencies::DepStream deps(this); deps.next(); ) { 1619 if (deps.type() == Dependencies::call_site_target_value) { 1620 // CallSite dependencies are managed on per-CallSite instance basis. 1621 oop call_site = deps.argument_oop(0); 1622 MethodHandles::remove_dependent_nmethod(call_site, this); 1623 } else { 1624 Klass* klass = deps.context_type(); 1625 if (klass == NULL) { 1626 continue; // ignore things like evol_method 1627 } 1628 // During GC the is_alive closure is non-NULL, and is used to 1629 // determine liveness of dependees that need to be updated. 1630 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1631 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1632 } 1633 } 1634 } 1635 } 1636 } 1637 1638 1639 // If this oop is not live, the nmethod can be unloaded. 1640 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1641 assert(root != NULL, "just checking"); 1642 oop obj = *root; 1643 if (obj == NULL || is_alive->do_object_b(obj)) { 1644 return false; 1645 } 1646 1647 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1648 // simply because one of its constant oops has gone dead. 1649 // No actual classes need to be unloaded in order for this to occur. 1650 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1651 make_unloaded(is_alive, obj); 1652 return true; 1653 } 1654 1655 // ------------------------------------------------------------------ 1656 // post_compiled_method_load_event 1657 // new method for install_code() path 1658 // Transfer information from compilation to jvmti 1659 void nmethod::post_compiled_method_load_event() { 1660 1661 Method* moop = method(); 1662 HOTSPOT_COMPILED_METHOD_LOAD( 1663 (char *) moop->klass_name()->bytes(), 1664 moop->klass_name()->utf8_length(), 1665 (char *) moop->name()->bytes(), 1666 moop->name()->utf8_length(), 1667 (char *) moop->signature()->bytes(), 1668 moop->signature()->utf8_length(), 1669 insts_begin(), insts_size()); 1670 1671 if (JvmtiExport::should_post_compiled_method_load() || 1672 JvmtiExport::should_post_compiled_method_unload()) { 1673 get_and_cache_jmethod_id(); 1674 } 1675 1676 if (JvmtiExport::should_post_compiled_method_load()) { 1677 // Let the Service thread (which is a real Java thread) post the event 1678 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1679 JvmtiDeferredEventQueue::enqueue( 1680 JvmtiDeferredEvent::compiled_method_load_event(this)); 1681 } 1682 } 1683 1684 jmethodID nmethod::get_and_cache_jmethod_id() { 1685 if (_jmethod_id == NULL) { 1686 // Cache the jmethod_id since it can no longer be looked up once the 1687 // method itself has been marked for unloading. 1688 _jmethod_id = method()->jmethod_id(); 1689 } 1690 return _jmethod_id; 1691 } 1692 1693 void nmethod::post_compiled_method_unload() { 1694 if (unload_reported()) { 1695 // During unloading we transition to unloaded and then to zombie 1696 // and the unloading is reported during the first transition. 1697 return; 1698 } 1699 1700 assert(_method != NULL && !is_unloaded(), "just checking"); 1701 DTRACE_METHOD_UNLOAD_PROBE(method()); 1702 1703 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1704 // post the event. Sometime later this nmethod will be made a zombie 1705 // by the sweeper but the Method* will not be valid at that point. 1706 // If the _jmethod_id is null then no load event was ever requested 1707 // so don't bother posting the unload. The main reason for this is 1708 // that the jmethodID is a weak reference to the Method* so if 1709 // it's being unloaded there's no way to look it up since the weak 1710 // ref will have been cleared. 1711 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1712 assert(!unload_reported(), "already unloaded"); 1713 JvmtiDeferredEvent event = 1714 JvmtiDeferredEvent::compiled_method_unload_event(this, 1715 _jmethod_id, insts_begin()); 1716 if (SafepointSynchronize::is_at_safepoint()) { 1717 // Don't want to take the queueing lock. Add it as pending and 1718 // it will get enqueued later. 1719 JvmtiDeferredEventQueue::add_pending_event(event); 1720 } else { 1721 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1722 JvmtiDeferredEventQueue::enqueue(event); 1723 } 1724 } 1725 1726 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1727 // any time. As the nmethod is being unloaded now we mark it has 1728 // having the unload event reported - this will ensure that we don't 1729 // attempt to report the event in the unlikely scenario where the 1730 // event is enabled at the time the nmethod is made a zombie. 1731 set_unload_reported(); 1732 } 1733 1734 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1735 if (ic->is_icholder_call()) { 1736 // The only exception is compiledICHolder oops which may 1737 // yet be marked below. (We check this further below). 1738 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1739 1740 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1741 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1742 return; 1743 } 1744 } else { 1745 Metadata* ic_oop = ic->cached_metadata(); 1746 if (ic_oop != NULL) { 1747 if (ic_oop->is_klass()) { 1748 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1749 return; 1750 } 1751 } else if (ic_oop->is_method()) { 1752 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1753 return; 1754 } 1755 } else { 1756 ShouldNotReachHere(); 1757 } 1758 } 1759 } 1760 1761 ic->set_to_clean(); 1762 } 1763 1764 // This is called at the end of the strong tracing/marking phase of a 1765 // GC to unload an nmethod if it contains otherwise unreachable 1766 // oops. 1767 1768 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1769 // Make sure the oop's ready to receive visitors 1770 assert(!is_zombie() && !is_unloaded(), 1771 "should not call follow on zombie or unloaded nmethod"); 1772 1773 // If the method is not entrant then a JMP is plastered over the 1774 // first few bytes. If an oop in the old code was there, that oop 1775 // should not get GC'd. Skip the first few bytes of oops on 1776 // not-entrant methods. 1777 address low_boundary = verified_entry_point(); 1778 if (is_not_entrant()) { 1779 low_boundary += NativeJump::instruction_size; 1780 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1781 // (See comment above.) 1782 } 1783 1784 // The RedefineClasses() API can cause the class unloading invariant 1785 // to no longer be true. See jvmtiExport.hpp for details. 1786 // Also, leave a debugging breadcrumb in local flag. 1787 if (JvmtiExport::has_redefined_a_class()) { 1788 // This set of the unloading_occurred flag is done before the 1789 // call to post_compiled_method_unload() so that the unloading 1790 // of this nmethod is reported. 1791 unloading_occurred = true; 1792 } 1793 1794 // Exception cache 1795 clean_exception_cache(is_alive); 1796 1797 // If class unloading occurred we first iterate over all inline caches and 1798 // clear ICs where the cached oop is referring to an unloaded klass or method. 1799 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1800 // iteration below. 1801 if (unloading_occurred) { 1802 RelocIterator iter(this, low_boundary); 1803 while(iter.next()) { 1804 if (iter.type() == relocInfo::virtual_call_type) { 1805 CompiledIC *ic = CompiledIC_at(&iter); 1806 clean_ic_if_metadata_is_dead(ic, is_alive); 1807 } 1808 } 1809 } 1810 1811 // Compiled code 1812 { 1813 RelocIterator iter(this, low_boundary); 1814 while (iter.next()) { 1815 if (iter.type() == relocInfo::oop_type) { 1816 oop_Relocation* r = iter.oop_reloc(); 1817 // In this loop, we must only traverse those oops directly embedded in 1818 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1819 assert(1 == (r->oop_is_immediate()) + 1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1821 "oop must be found in exactly one place"); 1822 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1823 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1824 return; 1825 } 1826 } 1827 } 1828 } 1829 } 1830 1831 1832 // Scopes 1833 for (oop* p = oops_begin(); p < oops_end(); p++) { 1834 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1835 if (can_unload(is_alive, p, unloading_occurred)) { 1836 return; 1837 } 1838 } 1839 1840 #if INCLUDE_JVMCI 1841 // Follow JVMCI method 1842 BarrierSet* bs = Universe::heap()->barrier_set(); 1843 if (_jvmci_installed_code != NULL) { 1844 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1845 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1846 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 1847 _jvmci_installed_code = NULL; 1848 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 1849 } 1850 } else { 1851 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1852 return; 1853 } 1854 } 1855 } 1856 1857 if (_speculation_log != NULL) { 1858 if (!is_alive->do_object_b(_speculation_log)) { 1859 bs->write_ref_nmethod_pre(&_speculation_log, this); 1860 _speculation_log = NULL; 1861 bs->write_ref_nmethod_post(&_speculation_log, this); 1862 } 1863 } 1864 #endif 1865 1866 1867 // Ensure that all metadata is still alive 1868 verify_metadata_loaders(low_boundary, is_alive); 1869 } 1870 1871 template <class CompiledICorStaticCall> 1872 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1873 // Ok, to lookup references to zombies here 1874 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1875 if (cb != NULL && cb->is_nmethod()) { 1876 nmethod* nm = (nmethod*)cb; 1877 1878 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1879 // The nmethod has not been processed yet. 1880 return true; 1881 } 1882 1883 // Clean inline caches pointing to both zombie and not_entrant methods 1884 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1885 ic->set_to_clean(); 1886 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1887 } 1888 } 1889 1890 return false; 1891 } 1892 1893 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1894 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1895 } 1896 1897 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1898 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1899 } 1900 1901 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1902 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1903 1904 oop_Relocation* r = iter_at_oop->oop_reloc(); 1905 // Traverse those oops directly embedded in the code. 1906 // Other oops (oop_index>0) are seen as part of scopes_oops. 1907 assert(1 == (r->oop_is_immediate()) + 1908 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1909 "oop must be found in exactly one place"); 1910 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1911 // Unload this nmethod if the oop is dead. 1912 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1913 return true;; 1914 } 1915 } 1916 1917 return false; 1918 } 1919 1920 1921 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1922 ResourceMark rm; 1923 1924 // Make sure the oop's ready to receive visitors 1925 assert(!is_zombie() && !is_unloaded(), 1926 "should not call follow on zombie or unloaded nmethod"); 1927 1928 // If the method is not entrant then a JMP is plastered over the 1929 // first few bytes. If an oop in the old code was there, that oop 1930 // should not get GC'd. Skip the first few bytes of oops on 1931 // not-entrant methods. 1932 address low_boundary = verified_entry_point(); 1933 if (is_not_entrant()) { 1934 low_boundary += NativeJump::instruction_size; 1935 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1936 // (See comment above.) 1937 } 1938 1939 // The RedefineClasses() API can cause the class unloading invariant 1940 // to no longer be true. See jvmtiExport.hpp for details. 1941 // Also, leave a debugging breadcrumb in local flag. 1942 if (JvmtiExport::has_redefined_a_class()) { 1943 // This set of the unloading_occurred flag is done before the 1944 // call to post_compiled_method_unload() so that the unloading 1945 // of this nmethod is reported. 1946 unloading_occurred = true; 1947 } 1948 1949 #if INCLUDE_JVMCI 1950 // Follow JVMCI method 1951 if (_jvmci_installed_code != NULL) { 1952 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1953 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1954 _jvmci_installed_code = NULL; 1955 } 1956 } else { 1957 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1958 return false; 1959 } 1960 } 1961 } 1962 1963 if (_speculation_log != NULL) { 1964 if (!is_alive->do_object_b(_speculation_log)) { 1965 _speculation_log = NULL; 1966 } 1967 } 1968 #endif 1969 1970 // Exception cache 1971 clean_exception_cache(is_alive); 1972 1973 bool is_unloaded = false; 1974 bool postponed = false; 1975 1976 RelocIterator iter(this, low_boundary); 1977 while(iter.next()) { 1978 1979 switch (iter.type()) { 1980 1981 case relocInfo::virtual_call_type: 1982 if (unloading_occurred) { 1983 // If class unloading occurred we first iterate over all inline caches and 1984 // clear ICs where the cached oop is referring to an unloaded klass or method. 1985 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1986 } 1987 1988 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1989 break; 1990 1991 case relocInfo::opt_virtual_call_type: 1992 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1993 break; 1994 1995 case relocInfo::static_call_type: 1996 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1997 break; 1998 1999 case relocInfo::oop_type: 2000 if (!is_unloaded) { 2001 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 2002 } 2003 break; 2004 2005 case relocInfo::metadata_type: 2006 break; // nothing to do. 2007 } 2008 } 2009 2010 if (is_unloaded) { 2011 return postponed; 2012 } 2013 2014 // Scopes 2015 for (oop* p = oops_begin(); p < oops_end(); p++) { 2016 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2017 if (can_unload(is_alive, p, unloading_occurred)) { 2018 is_unloaded = true; 2019 break; 2020 } 2021 } 2022 2023 if (is_unloaded) { 2024 return postponed; 2025 } 2026 2027 #if INCLUDE_JVMCI 2028 // Follow JVMCI method 2029 BarrierSet* bs = Universe::heap()->barrier_set(); 2030 if (_jvmci_installed_code != NULL) { 2031 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 2032 if (!is_alive->do_object_b(_jvmci_installed_code)) { 2033 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2034 _jvmci_installed_code = NULL; 2035 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2036 } 2037 } else { 2038 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 2039 is_unloaded = true; 2040 } 2041 } 2042 } 2043 2044 if (_speculation_log != NULL) { 2045 if (!is_alive->do_object_b(_speculation_log)) { 2046 bs->write_ref_nmethod_pre(&_speculation_log, this); 2047 _speculation_log = NULL; 2048 bs->write_ref_nmethod_post(&_speculation_log, this); 2049 } 2050 } 2051 #endif 2052 2053 // Ensure that all metadata is still alive 2054 verify_metadata_loaders(low_boundary, is_alive); 2055 2056 return postponed; 2057 } 2058 2059 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2060 ResourceMark rm; 2061 2062 // Make sure the oop's ready to receive visitors 2063 assert(!is_zombie(), 2064 "should not call follow on zombie nmethod"); 2065 2066 // If the method is not entrant then a JMP is plastered over the 2067 // first few bytes. If an oop in the old code was there, that oop 2068 // should not get GC'd. Skip the first few bytes of oops on 2069 // not-entrant methods. 2070 address low_boundary = verified_entry_point(); 2071 if (is_not_entrant()) { 2072 low_boundary += NativeJump::instruction_size; 2073 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2074 // (See comment above.) 2075 } 2076 2077 RelocIterator iter(this, low_boundary); 2078 while(iter.next()) { 2079 2080 switch (iter.type()) { 2081 2082 case relocInfo::virtual_call_type: 2083 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2084 break; 2085 2086 case relocInfo::opt_virtual_call_type: 2087 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2088 break; 2089 2090 case relocInfo::static_call_type: 2091 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2092 break; 2093 } 2094 } 2095 } 2096 2097 #ifdef ASSERT 2098 2099 class CheckClass : AllStatic { 2100 static BoolObjectClosure* _is_alive; 2101 2102 // Check class_loader is alive for this bit of metadata. 2103 static void check_class(Metadata* md) { 2104 Klass* klass = NULL; 2105 if (md->is_klass()) { 2106 klass = ((Klass*)md); 2107 } else if (md->is_method()) { 2108 klass = ((Method*)md)->method_holder(); 2109 } else if (md->is_methodData()) { 2110 klass = ((MethodData*)md)->method()->method_holder(); 2111 } else { 2112 md->print(); 2113 ShouldNotReachHere(); 2114 } 2115 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2116 } 2117 public: 2118 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2119 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2120 _is_alive = is_alive; 2121 nm->metadata_do(check_class); 2122 } 2123 }; 2124 2125 // This is called during a safepoint so can use static data 2126 BoolObjectClosure* CheckClass::_is_alive = NULL; 2127 #endif // ASSERT 2128 2129 2130 // Processing of oop references should have been sufficient to keep 2131 // all strong references alive. Any weak references should have been 2132 // cleared as well. Visit all the metadata and ensure that it's 2133 // really alive. 2134 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2135 #ifdef ASSERT 2136 RelocIterator iter(this, low_boundary); 2137 while (iter.next()) { 2138 // static_stub_Relocations may have dangling references to 2139 // Method*s so trim them out here. Otherwise it looks like 2140 // compiled code is maintaining a link to dead metadata. 2141 address static_call_addr = NULL; 2142 if (iter.type() == relocInfo::opt_virtual_call_type) { 2143 CompiledIC* cic = CompiledIC_at(&iter); 2144 if (!cic->is_call_to_interpreted()) { 2145 static_call_addr = iter.addr(); 2146 } 2147 } else if (iter.type() == relocInfo::static_call_type) { 2148 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2149 if (!csc->is_call_to_interpreted()) { 2150 static_call_addr = iter.addr(); 2151 } 2152 } 2153 if (static_call_addr != NULL) { 2154 RelocIterator sciter(this, low_boundary); 2155 while (sciter.next()) { 2156 if (sciter.type() == relocInfo::static_stub_type && 2157 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2158 sciter.static_stub_reloc()->clear_inline_cache(); 2159 } 2160 } 2161 } 2162 } 2163 // Check that the metadata embedded in the nmethod is alive 2164 CheckClass::do_check_class(is_alive, this); 2165 #endif 2166 } 2167 2168 2169 // Iterate over metadata calling this function. Used by RedefineClasses 2170 void nmethod::metadata_do(void f(Metadata*)) { 2171 address low_boundary = verified_entry_point(); 2172 if (is_not_entrant()) { 2173 low_boundary += NativeJump::instruction_size; 2174 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2175 // (See comment above.) 2176 } 2177 { 2178 // Visit all immediate references that are embedded in the instruction stream. 2179 RelocIterator iter(this, low_boundary); 2180 while (iter.next()) { 2181 if (iter.type() == relocInfo::metadata_type ) { 2182 metadata_Relocation* r = iter.metadata_reloc(); 2183 // In this metadata, we must only follow those metadatas directly embedded in 2184 // the code. Other metadatas (oop_index>0) are seen as part of 2185 // the metadata section below. 2186 assert(1 == (r->metadata_is_immediate()) + 2187 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2188 "metadata must be found in exactly one place"); 2189 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2190 Metadata* md = r->metadata_value(); 2191 if (md != _method) f(md); 2192 } 2193 } else if (iter.type() == relocInfo::virtual_call_type) { 2194 // Check compiledIC holders associated with this nmethod 2195 CompiledIC *ic = CompiledIC_at(&iter); 2196 if (ic->is_icholder_call()) { 2197 CompiledICHolder* cichk = ic->cached_icholder(); 2198 f(cichk->holder_method()); 2199 f(cichk->holder_klass()); 2200 } else { 2201 Metadata* ic_oop = ic->cached_metadata(); 2202 if (ic_oop != NULL) { 2203 f(ic_oop); 2204 } 2205 } 2206 } 2207 } 2208 } 2209 2210 // Visit the metadata section 2211 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2212 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2213 Metadata* md = *p; 2214 f(md); 2215 } 2216 2217 // Visit metadata not embedded in the other places. 2218 if (_method != NULL) f(_method); 2219 } 2220 2221 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2222 // make sure the oops ready to receive visitors 2223 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2224 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2225 2226 // If the method is not entrant or zombie then a JMP is plastered over the 2227 // first few bytes. If an oop in the old code was there, that oop 2228 // should not get GC'd. Skip the first few bytes of oops on 2229 // not-entrant methods. 2230 address low_boundary = verified_entry_point(); 2231 if (is_not_entrant()) { 2232 low_boundary += NativeJump::instruction_size; 2233 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2234 // (See comment above.) 2235 } 2236 2237 #if INCLUDE_JVMCI 2238 if (_jvmci_installed_code != NULL) { 2239 f->do_oop((oop*) &_jvmci_installed_code); 2240 } 2241 if (_speculation_log != NULL) { 2242 f->do_oop((oop*) &_speculation_log); 2243 } 2244 #endif 2245 2246 RelocIterator iter(this, low_boundary); 2247 2248 while (iter.next()) { 2249 if (iter.type() == relocInfo::oop_type ) { 2250 oop_Relocation* r = iter.oop_reloc(); 2251 // In this loop, we must only follow those oops directly embedded in 2252 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2253 assert(1 == (r->oop_is_immediate()) + 2254 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2255 "oop must be found in exactly one place"); 2256 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2257 f->do_oop(r->oop_addr()); 2258 } 2259 } 2260 } 2261 2262 // Scopes 2263 // This includes oop constants not inlined in the code stream. 2264 for (oop* p = oops_begin(); p < oops_end(); p++) { 2265 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2266 f->do_oop(p); 2267 } 2268 } 2269 2270 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2271 2272 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2273 2274 // An nmethod is "marked" if its _mark_link is set non-null. 2275 // Even if it is the end of the linked list, it will have a non-null link value, 2276 // as long as it is on the list. 2277 // This code must be MP safe, because it is used from parallel GC passes. 2278 bool nmethod::test_set_oops_do_mark() { 2279 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2280 nmethod* observed_mark_link = _oops_do_mark_link; 2281 if (observed_mark_link == NULL) { 2282 // Claim this nmethod for this thread to mark. 2283 observed_mark_link = (nmethod*) 2284 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2285 if (observed_mark_link == NULL) { 2286 2287 // Atomically append this nmethod (now claimed) to the head of the list: 2288 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2289 for (;;) { 2290 nmethod* required_mark_nmethods = observed_mark_nmethods; 2291 _oops_do_mark_link = required_mark_nmethods; 2292 observed_mark_nmethods = (nmethod*) 2293 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2294 if (observed_mark_nmethods == required_mark_nmethods) 2295 break; 2296 } 2297 // Mark was clear when we first saw this guy. 2298 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2299 return false; 2300 } 2301 } 2302 // On fall through, another racing thread marked this nmethod before we did. 2303 return true; 2304 } 2305 2306 void nmethod::oops_do_marking_prologue() { 2307 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2308 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2309 // We use cmpxchg_ptr instead of regular assignment here because the user 2310 // may fork a bunch of threads, and we need them all to see the same state. 2311 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2312 guarantee(observed == NULL, "no races in this sequential code"); 2313 } 2314 2315 void nmethod::oops_do_marking_epilogue() { 2316 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2317 nmethod* cur = _oops_do_mark_nmethods; 2318 while (cur != NMETHOD_SENTINEL) { 2319 assert(cur != NULL, "not NULL-terminated"); 2320 nmethod* next = cur->_oops_do_mark_link; 2321 cur->_oops_do_mark_link = NULL; 2322 cur->verify_oop_relocations(); 2323 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2324 cur = next; 2325 } 2326 void* required = _oops_do_mark_nmethods; 2327 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2328 guarantee(observed == required, "no races in this sequential code"); 2329 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2330 } 2331 2332 class DetectScavengeRoot: public OopClosure { 2333 bool _detected_scavenge_root; 2334 public: 2335 DetectScavengeRoot() : _detected_scavenge_root(false) 2336 { NOT_PRODUCT(_print_nm = NULL); } 2337 bool detected_scavenge_root() { return _detected_scavenge_root; } 2338 virtual void do_oop(oop* p) { 2339 if ((*p) != NULL && (*p)->is_scavengable()) { 2340 NOT_PRODUCT(maybe_print(p)); 2341 _detected_scavenge_root = true; 2342 } 2343 } 2344 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2345 2346 #ifndef PRODUCT 2347 nmethod* _print_nm; 2348 void maybe_print(oop* p) { 2349 if (_print_nm == NULL) return; 2350 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2351 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2352 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2353 (void *)(*p), (intptr_t)p); 2354 (*p)->print(); 2355 } 2356 #endif //PRODUCT 2357 }; 2358 2359 bool nmethod::detect_scavenge_root_oops() { 2360 DetectScavengeRoot detect_scavenge_root; 2361 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2362 oops_do(&detect_scavenge_root); 2363 return detect_scavenge_root.detected_scavenge_root(); 2364 } 2365 2366 // Method that knows how to preserve outgoing arguments at call. This method must be 2367 // called with a frame corresponding to a Java invoke 2368 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2369 #ifndef SHARK 2370 if (method() != NULL && !method()->is_native()) { 2371 SimpleScopeDesc ssd(this, fr.pc()); 2372 Bytecode_invoke call(ssd.method(), ssd.bci()); 2373 bool has_receiver = call.has_receiver(); 2374 bool has_appendix = call.has_appendix(); 2375 Symbol* signature = call.signature(); 2376 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2377 } 2378 #endif // !SHARK 2379 } 2380 2381 inline bool includes(void* p, void* from, void* to) { 2382 return from <= p && p < to; 2383 } 2384 2385 2386 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2387 assert(count >= 2, "must be sentinel values, at least"); 2388 2389 #ifdef ASSERT 2390 // must be sorted and unique; we do a binary search in find_pc_desc() 2391 int prev_offset = pcs[0].pc_offset(); 2392 assert(prev_offset == PcDesc::lower_offset_limit, 2393 "must start with a sentinel"); 2394 for (int i = 1; i < count; i++) { 2395 int this_offset = pcs[i].pc_offset(); 2396 assert(this_offset > prev_offset, "offsets must be sorted"); 2397 prev_offset = this_offset; 2398 } 2399 assert(prev_offset == PcDesc::upper_offset_limit, 2400 "must end with a sentinel"); 2401 #endif //ASSERT 2402 2403 // Search for MethodHandle invokes and tag the nmethod. 2404 for (int i = 0; i < count; i++) { 2405 if (pcs[i].is_method_handle_invoke()) { 2406 set_has_method_handle_invokes(true); 2407 break; 2408 } 2409 } 2410 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2411 2412 int size = count * sizeof(PcDesc); 2413 assert(scopes_pcs_size() >= size, "oob"); 2414 memcpy(scopes_pcs_begin(), pcs, size); 2415 2416 // Adjust the final sentinel downward. 2417 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2418 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2419 last_pc->set_pc_offset(content_size() + 1); 2420 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2421 // Fill any rounding gaps with copies of the last record. 2422 last_pc[1] = last_pc[0]; 2423 } 2424 // The following assert could fail if sizeof(PcDesc) is not 2425 // an integral multiple of oopSize (the rounding term). 2426 // If it fails, change the logic to always allocate a multiple 2427 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2428 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2429 } 2430 2431 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2432 assert(scopes_data_size() >= size, "oob"); 2433 memcpy(scopes_data_begin(), buffer, size); 2434 } 2435 2436 // When using JVMCI the address might be off by the size of a call instruction. 2437 bool nmethod::is_deopt_entry(address pc) { 2438 return pc == deopt_handler_begin() 2439 #if INCLUDE_JVMCI 2440 || pc == (deopt_handler_begin() + NativeCall::instruction_size) 2441 #endif 2442 ; 2443 } 2444 2445 #ifdef ASSERT 2446 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2447 PcDesc* lower = nm->scopes_pcs_begin(); 2448 PcDesc* upper = nm->scopes_pcs_end(); 2449 lower += 1; // exclude initial sentinel 2450 PcDesc* res = NULL; 2451 for (PcDesc* p = lower; p < upper; p++) { 2452 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2453 if (match_desc(p, pc_offset, approximate)) { 2454 if (res == NULL) 2455 res = p; 2456 else 2457 res = (PcDesc*) badAddress; 2458 } 2459 } 2460 return res; 2461 } 2462 #endif 2463 2464 2465 // Finds a PcDesc with real-pc equal to "pc" 2466 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2467 address base_address = code_begin(); 2468 if ((pc < base_address) || 2469 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2470 return NULL; // PC is wildly out of range 2471 } 2472 int pc_offset = (int) (pc - base_address); 2473 2474 // Check the PcDesc cache if it contains the desired PcDesc 2475 // (This as an almost 100% hit rate.) 2476 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2477 if (res != NULL) { 2478 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2479 return res; 2480 } 2481 2482 // Fallback algorithm: quasi-linear search for the PcDesc 2483 // Find the last pc_offset less than the given offset. 2484 // The successor must be the required match, if there is a match at all. 2485 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2486 PcDesc* lower = scopes_pcs_begin(); 2487 PcDesc* upper = scopes_pcs_end(); 2488 upper -= 1; // exclude final sentinel 2489 if (lower >= upper) return NULL; // native method; no PcDescs at all 2490 2491 #define assert_LU_OK \ 2492 /* invariant on lower..upper during the following search: */ \ 2493 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2494 assert(upper->pc_offset() >= pc_offset, "sanity") 2495 assert_LU_OK; 2496 2497 // Use the last successful return as a split point. 2498 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2499 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2500 if (mid->pc_offset() < pc_offset) { 2501 lower = mid; 2502 } else { 2503 upper = mid; 2504 } 2505 2506 // Take giant steps at first (4096, then 256, then 16, then 1) 2507 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2508 const int RADIX = (1 << LOG2_RADIX); 2509 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2510 while ((mid = lower + step) < upper) { 2511 assert_LU_OK; 2512 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2513 if (mid->pc_offset() < pc_offset) { 2514 lower = mid; 2515 } else { 2516 upper = mid; 2517 break; 2518 } 2519 } 2520 assert_LU_OK; 2521 } 2522 2523 // Sneak up on the value with a linear search of length ~16. 2524 while (true) { 2525 assert_LU_OK; 2526 mid = lower + 1; 2527 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2528 if (mid->pc_offset() < pc_offset) { 2529 lower = mid; 2530 } else { 2531 upper = mid; 2532 break; 2533 } 2534 } 2535 #undef assert_LU_OK 2536 2537 if (match_desc(upper, pc_offset, approximate)) { 2538 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2539 _pc_desc_cache.add_pc_desc(upper); 2540 return upper; 2541 } else { 2542 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2543 return NULL; 2544 } 2545 } 2546 2547 2548 void nmethod::check_all_dependencies(DepChange& changes) { 2549 // Checked dependencies are allocated into this ResourceMark 2550 ResourceMark rm; 2551 2552 // Turn off dependency tracing while actually testing dependencies. 2553 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2554 2555 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2556 &DependencySignature::equals, 11027> DepTable; 2557 2558 DepTable* table = new DepTable(); 2559 2560 // Iterate over live nmethods and check dependencies of all nmethods that are not 2561 // marked for deoptimization. A particular dependency is only checked once. 2562 NMethodIterator iter; 2563 while(iter.next()) { 2564 nmethod* nm = iter.method(); 2565 // Only notify for live nmethods 2566 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2567 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2568 // Construct abstraction of a dependency. 2569 DependencySignature* current_sig = new DependencySignature(deps); 2570 2571 // Determine if dependency is already checked. table->put(...) returns 2572 // 'true' if the dependency is added (i.e., was not in the hashtable). 2573 if (table->put(*current_sig, 1)) { 2574 if (deps.check_dependency() != NULL) { 2575 // Dependency checking failed. Print out information about the failed 2576 // dependency and finally fail with an assert. We can fail here, since 2577 // dependency checking is never done in a product build. 2578 tty->print_cr("Failed dependency:"); 2579 changes.print(); 2580 nm->print(); 2581 nm->print_dependencies(); 2582 assert(false, "Should have been marked for deoptimization"); 2583 } 2584 } 2585 } 2586 } 2587 } 2588 } 2589 2590 bool nmethod::check_dependency_on(DepChange& changes) { 2591 // What has happened: 2592 // 1) a new class dependee has been added 2593 // 2) dependee and all its super classes have been marked 2594 bool found_check = false; // set true if we are upset 2595 for (Dependencies::DepStream deps(this); deps.next(); ) { 2596 // Evaluate only relevant dependencies. 2597 if (deps.spot_check_dependency_at(changes) != NULL) { 2598 found_check = true; 2599 NOT_DEBUG(break); 2600 } 2601 } 2602 return found_check; 2603 } 2604 2605 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2606 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2607 Array<Method*>* dependee_methods = dependee_ik->methods(); 2608 for (Dependencies::DepStream deps(this); deps.next(); ) { 2609 if (deps.type() == Dependencies::evol_method) { 2610 Method* method = deps.method_argument(0); 2611 for (int j = 0; j < dependee_methods->length(); j++) { 2612 if (dependee_methods->at(j) == method) { 2613 // RC_TRACE macro has an embedded ResourceMark 2614 RC_TRACE(0x01000000, 2615 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2616 _method->method_holder()->external_name(), 2617 _method->name()->as_C_string(), 2618 _method->signature()->as_C_string(), compile_id(), 2619 method->method_holder()->external_name(), 2620 method->name()->as_C_string(), 2621 method->signature()->as_C_string())); 2622 if (TraceDependencies || LogCompilation) 2623 deps.log_dependency(dependee); 2624 return true; 2625 } 2626 } 2627 } 2628 } 2629 return false; 2630 } 2631 2632 // Called from mark_for_deoptimization, when dependee is invalidated. 2633 bool nmethod::is_dependent_on_method(Method* dependee) { 2634 for (Dependencies::DepStream deps(this); deps.next(); ) { 2635 if (deps.type() != Dependencies::evol_method) 2636 continue; 2637 Method* method = deps.method_argument(0); 2638 if (method == dependee) return true; 2639 } 2640 return false; 2641 } 2642 2643 2644 bool nmethod::is_patchable_at(address instr_addr) { 2645 assert(insts_contains(instr_addr), "wrong nmethod used"); 2646 if (is_zombie()) { 2647 // a zombie may never be patched 2648 return false; 2649 } 2650 return true; 2651 } 2652 2653 2654 address nmethod::continuation_for_implicit_exception(address pc) { 2655 // Exception happened outside inline-cache check code => we are inside 2656 // an active nmethod => use cpc to determine a return address 2657 int exception_offset = pc - code_begin(); 2658 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2659 #ifdef ASSERT 2660 if (cont_offset == 0) { 2661 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2662 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2663 HandleMark hm(thread); 2664 ResourceMark rm(thread); 2665 CodeBlob* cb = CodeCache::find_blob(pc); 2666 assert(cb != NULL && cb == this, ""); 2667 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2668 print(); 2669 method()->print_codes(); 2670 print_code(); 2671 print_pcs(); 2672 } 2673 #endif 2674 if (cont_offset == 0) { 2675 // Let the normal error handling report the exception 2676 return NULL; 2677 } 2678 return code_begin() + cont_offset; 2679 } 2680 2681 2682 2683 void nmethod_init() { 2684 // make sure you didn't forget to adjust the filler fields 2685 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2686 } 2687 2688 2689 //------------------------------------------------------------------------------------------- 2690 2691 2692 // QQQ might we make this work from a frame?? 2693 nmethodLocker::nmethodLocker(address pc) { 2694 CodeBlob* cb = CodeCache::find_blob(pc); 2695 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2696 _nm = (nmethod*)cb; 2697 lock_nmethod(_nm); 2698 } 2699 2700 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2701 // should pass zombie_ok == true. 2702 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2703 if (nm == NULL) return; 2704 Atomic::inc(&nm->_lock_count); 2705 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2706 } 2707 2708 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2709 if (nm == NULL) return; 2710 Atomic::dec(&nm->_lock_count); 2711 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2712 } 2713 2714 // ----------------------------------------------------------------------------- 2715 // nmethod::get_deopt_original_pc 2716 // 2717 // Return the original PC for the given PC if: 2718 // (a) the given PC belongs to a nmethod and 2719 // (b) it is a deopt PC 2720 address nmethod::get_deopt_original_pc(const frame* fr) { 2721 if (fr->cb() == NULL) return NULL; 2722 2723 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2724 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2725 return nm->get_original_pc(fr); 2726 2727 return NULL; 2728 } 2729 2730 2731 // ----------------------------------------------------------------------------- 2732 // MethodHandle 2733 2734 bool nmethod::is_method_handle_return(address return_pc) { 2735 if (!has_method_handle_invokes()) return false; 2736 PcDesc* pd = pc_desc_at(return_pc); 2737 if (pd == NULL) 2738 return false; 2739 return pd->is_method_handle_invoke(); 2740 } 2741 2742 2743 // ----------------------------------------------------------------------------- 2744 // Verification 2745 2746 class VerifyOopsClosure: public OopClosure { 2747 nmethod* _nm; 2748 bool _ok; 2749 public: 2750 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2751 bool ok() { return _ok; } 2752 virtual void do_oop(oop* p) { 2753 if ((*p) == NULL || (*p)->is_oop()) return; 2754 if (_ok) { 2755 _nm->print_nmethod(true); 2756 _ok = false; 2757 } 2758 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2759 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2760 } 2761 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2762 }; 2763 2764 void nmethod::verify() { 2765 2766 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2767 // seems odd. 2768 2769 if (is_zombie() || is_not_entrant() || is_unloaded()) 2770 return; 2771 2772 // Make sure all the entry points are correctly aligned for patching. 2773 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2774 2775 // assert(method()->is_oop(), "must be valid"); 2776 2777 ResourceMark rm; 2778 2779 if (!CodeCache::contains(this)) { 2780 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2781 } 2782 2783 if(is_native_method() ) 2784 return; 2785 2786 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2787 if (nm != this) { 2788 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2789 this)); 2790 } 2791 2792 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2793 if (! p->verify(this)) { 2794 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2795 } 2796 } 2797 2798 VerifyOopsClosure voc(this); 2799 oops_do(&voc); 2800 assert(voc.ok(), "embedded oops must be OK"); 2801 verify_scavenge_root_oops(); 2802 2803 verify_scopes(); 2804 } 2805 2806 2807 void nmethod::verify_interrupt_point(address call_site) { 2808 // Verify IC only when nmethod installation is finished. 2809 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2810 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2811 if (is_installed) { 2812 Thread *cur = Thread::current(); 2813 if (CompiledIC_lock->owner() == cur || 2814 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2815 SafepointSynchronize::is_at_safepoint())) { 2816 CompiledIC_at(this, call_site); 2817 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2818 } else { 2819 MutexLocker ml_verify (CompiledIC_lock); 2820 CompiledIC_at(this, call_site); 2821 } 2822 } 2823 2824 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2825 assert(pd != NULL, "PcDesc must exist"); 2826 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2827 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2828 pd->return_oop()); 2829 !sd->is_top(); sd = sd->sender()) { 2830 sd->verify(); 2831 } 2832 } 2833 2834 void nmethod::verify_scopes() { 2835 if( !method() ) return; // Runtime stubs have no scope 2836 if (method()->is_native()) return; // Ignore stub methods. 2837 // iterate through all interrupt point 2838 // and verify the debug information is valid. 2839 RelocIterator iter((nmethod*)this); 2840 while (iter.next()) { 2841 address stub = NULL; 2842 switch (iter.type()) { 2843 case relocInfo::virtual_call_type: 2844 verify_interrupt_point(iter.addr()); 2845 break; 2846 case relocInfo::opt_virtual_call_type: 2847 stub = iter.opt_virtual_call_reloc()->static_stub(); 2848 verify_interrupt_point(iter.addr()); 2849 break; 2850 case relocInfo::static_call_type: 2851 stub = iter.static_call_reloc()->static_stub(); 2852 //verify_interrupt_point(iter.addr()); 2853 break; 2854 case relocInfo::runtime_call_type: 2855 address destination = iter.reloc()->value(); 2856 // Right now there is no way to find out which entries support 2857 // an interrupt point. It would be nice if we had this 2858 // information in a table. 2859 break; 2860 } 2861 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2862 } 2863 } 2864 2865 2866 // ----------------------------------------------------------------------------- 2867 // Non-product code 2868 #ifndef PRODUCT 2869 2870 class DebugScavengeRoot: public OopClosure { 2871 nmethod* _nm; 2872 bool _ok; 2873 public: 2874 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2875 bool ok() { return _ok; } 2876 virtual void do_oop(oop* p) { 2877 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2878 if (_ok) { 2879 _nm->print_nmethod(true); 2880 _ok = false; 2881 } 2882 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2883 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2884 (*p)->print(); 2885 } 2886 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2887 }; 2888 2889 void nmethod::verify_scavenge_root_oops() { 2890 if (UseG1GC) { 2891 return; 2892 } 2893 2894 if (!on_scavenge_root_list()) { 2895 // Actually look inside, to verify the claim that it's clean. 2896 DebugScavengeRoot debug_scavenge_root(this); 2897 oops_do(&debug_scavenge_root); 2898 if (!debug_scavenge_root.ok()) 2899 fatal("found an unadvertised bad scavengable oop in the code cache"); 2900 } 2901 assert(scavenge_root_not_marked(), ""); 2902 } 2903 2904 #endif // PRODUCT 2905 2906 // Printing operations 2907 2908 void nmethod::print() const { 2909 ResourceMark rm; 2910 ttyLocker ttyl; // keep the following output all in one block 2911 2912 tty->print("Compiled method "); 2913 2914 if (is_compiled_by_c1()) { 2915 tty->print("(c1) "); 2916 } else if (is_compiled_by_c2()) { 2917 tty->print("(c2) "); 2918 } else if (is_compiled_by_shark()) { 2919 tty->print("(shark) "); 2920 } else if (is_compiled_by_jvmci()) { 2921 tty->print("(JVMCI) "); 2922 } else { 2923 tty->print("(nm) "); 2924 } 2925 2926 print_on(tty, NULL); 2927 2928 if (WizardMode) { 2929 tty->print("((nmethod*) " INTPTR_FORMAT ") ", this); 2930 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2931 tty->print(" { "); 2932 if (is_in_use()) tty->print("in_use "); 2933 if (is_not_entrant()) tty->print("not_entrant "); 2934 if (is_zombie()) tty->print("zombie "); 2935 if (is_unloaded()) tty->print("unloaded "); 2936 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2937 tty->print_cr("}:"); 2938 } 2939 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2940 (address)this, 2941 (address)this + size(), 2942 size()); 2943 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2944 relocation_begin(), 2945 relocation_end(), 2946 relocation_size()); 2947 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2948 consts_begin(), 2949 consts_end(), 2950 consts_size()); 2951 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2952 insts_begin(), 2953 insts_end(), 2954 insts_size()); 2955 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2956 stub_begin(), 2957 stub_end(), 2958 stub_size()); 2959 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2960 oops_begin(), 2961 oops_end(), 2962 oops_size()); 2963 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2964 metadata_begin(), 2965 metadata_end(), 2966 metadata_size()); 2967 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2968 scopes_data_begin(), 2969 scopes_data_end(), 2970 scopes_data_size()); 2971 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2972 scopes_pcs_begin(), 2973 scopes_pcs_end(), 2974 scopes_pcs_size()); 2975 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2976 dependencies_begin(), 2977 dependencies_end(), 2978 dependencies_size()); 2979 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2980 handler_table_begin(), 2981 handler_table_end(), 2982 handler_table_size()); 2983 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2984 nul_chk_table_begin(), 2985 nul_chk_table_end(), 2986 nul_chk_table_size()); 2987 } 2988 2989 void nmethod::print_code() { 2990 HandleMark hm; 2991 ResourceMark m; 2992 Disassembler::decode(this); 2993 } 2994 2995 2996 #ifndef PRODUCT 2997 2998 void nmethod::print_scopes() { 2999 // Find the first pc desc for all scopes in the code and print it. 3000 ResourceMark rm; 3001 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3002 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 3003 continue; 3004 3005 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 3006 while (sd != NULL) { 3007 sd->print_on(tty, p); 3008 sd = sd->sender(); 3009 } 3010 } 3011 } 3012 3013 void nmethod::print_dependencies() { 3014 ResourceMark rm; 3015 ttyLocker ttyl; // keep the following output all in one block 3016 tty->print_cr("Dependencies:"); 3017 for (Dependencies::DepStream deps(this); deps.next(); ) { 3018 deps.print_dependency(); 3019 Klass* ctxk = deps.context_type(); 3020 if (ctxk != NULL) { 3021 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 3022 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 3023 } 3024 } 3025 deps.log_dependency(); // put it into the xml log also 3026 } 3027 } 3028 3029 3030 void nmethod::print_relocations() { 3031 ResourceMark m; // in case methods get printed via the debugger 3032 tty->print_cr("relocations:"); 3033 RelocIterator iter(this); 3034 iter.print(); 3035 if (UseRelocIndex) { 3036 jint* index_end = (jint*)relocation_end() - 1; 3037 jint index_size = *index_end; 3038 jint* index_start = (jint*)( (address)index_end - index_size ); 3039 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 3040 if (index_size > 0) { 3041 jint* ip; 3042 for (ip = index_start; ip+2 <= index_end; ip += 2) 3043 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 3044 ip[0], 3045 ip[1], 3046 header_end()+ip[0], 3047 relocation_begin()-1+ip[1]); 3048 for (; ip < index_end; ip++) 3049 tty->print_cr(" (%d ?)", ip[0]); 3050 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 3051 ip++; 3052 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 3053 } 3054 } 3055 } 3056 3057 3058 void nmethod::print_pcs() { 3059 ResourceMark m; // in case methods get printed via debugger 3060 tty->print_cr("pc-bytecode offsets:"); 3061 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3062 p->print(this); 3063 } 3064 } 3065 3066 #endif // PRODUCT 3067 3068 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3069 RelocIterator iter(this, begin, end); 3070 bool have_one = false; 3071 while (iter.next()) { 3072 have_one = true; 3073 switch (iter.type()) { 3074 case relocInfo::none: return "no_reloc"; 3075 case relocInfo::oop_type: { 3076 stringStream st; 3077 oop_Relocation* r = iter.oop_reloc(); 3078 oop obj = r->oop_value(); 3079 st.print("oop("); 3080 if (obj == NULL) st.print("NULL"); 3081 else obj->print_value_on(&st); 3082 st.print(")"); 3083 return st.as_string(); 3084 } 3085 case relocInfo::metadata_type: { 3086 stringStream st; 3087 metadata_Relocation* r = iter.metadata_reloc(); 3088 Metadata* obj = r->metadata_value(); 3089 st.print("metadata("); 3090 if (obj == NULL) st.print("NULL"); 3091 else obj->print_value_on(&st); 3092 st.print(")"); 3093 return st.as_string(); 3094 } 3095 case relocInfo::runtime_call_type: { 3096 stringStream st; 3097 st.print("runtime_call"); 3098 runtime_call_Relocation* r = iter.runtime_call_reloc(); 3099 address dest = r->destination(); 3100 CodeBlob* cb = CodeCache::find_blob(dest); 3101 if (cb != NULL) { 3102 st.print(" %s", cb->name()); 3103 } 3104 return st.as_string(); 3105 } 3106 case relocInfo::virtual_call_type: return "virtual_call"; 3107 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 3108 case relocInfo::static_call_type: return "static_call"; 3109 case relocInfo::static_stub_type: return "static_stub"; 3110 case relocInfo::external_word_type: return "external_word"; 3111 case relocInfo::internal_word_type: return "internal_word"; 3112 case relocInfo::section_word_type: return "section_word"; 3113 case relocInfo::poll_type: return "poll"; 3114 case relocInfo::poll_return_type: return "poll_return"; 3115 case relocInfo::type_mask: return "type_bit_mask"; 3116 } 3117 } 3118 return have_one ? "other" : NULL; 3119 } 3120 3121 // Return a the last scope in (begin..end] 3122 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3123 PcDesc* p = pc_desc_near(begin+1); 3124 if (p != NULL && p->real_pc(this) <= end) { 3125 return new ScopeDesc(this, p->scope_decode_offset(), 3126 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3127 p->return_oop()); 3128 } 3129 return NULL; 3130 } 3131 3132 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3133 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3134 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3135 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3136 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3137 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3138 3139 if (has_method_handle_invokes()) 3140 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3141 3142 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3143 3144 if (block_begin == entry_point()) { 3145 methodHandle m = method(); 3146 if (m.not_null()) { 3147 stream->print(" # "); 3148 m->print_value_on(stream); 3149 stream->cr(); 3150 } 3151 if (m.not_null() && !is_osr_method()) { 3152 ResourceMark rm; 3153 int sizeargs = m->size_of_parameters(); 3154 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3155 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3156 { 3157 int sig_index = 0; 3158 if (!m->is_static()) 3159 sig_bt[sig_index++] = T_OBJECT; // 'this' 3160 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3161 BasicType t = ss.type(); 3162 sig_bt[sig_index++] = t; 3163 if (type2size[t] == 2) { 3164 sig_bt[sig_index++] = T_VOID; 3165 } else { 3166 assert(type2size[t] == 1, "size is 1 or 2"); 3167 } 3168 } 3169 assert(sig_index == sizeargs, ""); 3170 } 3171 const char* spname = "sp"; // make arch-specific? 3172 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3173 int stack_slot_offset = this->frame_size() * wordSize; 3174 int tab1 = 14, tab2 = 24; 3175 int sig_index = 0; 3176 int arg_index = (m->is_static() ? 0 : -1); 3177 bool did_old_sp = false; 3178 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3179 bool at_this = (arg_index == -1); 3180 bool at_old_sp = false; 3181 BasicType t = (at_this ? T_OBJECT : ss.type()); 3182 assert(t == sig_bt[sig_index], "sigs in sync"); 3183 if (at_this) 3184 stream->print(" # this: "); 3185 else 3186 stream->print(" # parm%d: ", arg_index); 3187 stream->move_to(tab1); 3188 VMReg fst = regs[sig_index].first(); 3189 VMReg snd = regs[sig_index].second(); 3190 if (fst->is_reg()) { 3191 stream->print("%s", fst->name()); 3192 if (snd->is_valid()) { 3193 stream->print(":%s", snd->name()); 3194 } 3195 } else if (fst->is_stack()) { 3196 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3197 if (offset == stack_slot_offset) at_old_sp = true; 3198 stream->print("[%s+0x%x]", spname, offset); 3199 } else { 3200 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3201 } 3202 stream->print(" "); 3203 stream->move_to(tab2); 3204 stream->print("= "); 3205 if (at_this) { 3206 m->method_holder()->print_value_on(stream); 3207 } else { 3208 bool did_name = false; 3209 if (!at_this && ss.is_object()) { 3210 Symbol* name = ss.as_symbol_or_null(); 3211 if (name != NULL) { 3212 name->print_value_on(stream); 3213 did_name = true; 3214 } 3215 } 3216 if (!did_name) 3217 stream->print("%s", type2name(t)); 3218 } 3219 if (at_old_sp) { 3220 stream->print(" (%s of caller)", spname); 3221 did_old_sp = true; 3222 } 3223 stream->cr(); 3224 sig_index += type2size[t]; 3225 arg_index += 1; 3226 if (!at_this) ss.next(); 3227 } 3228 if (!did_old_sp) { 3229 stream->print(" # "); 3230 stream->move_to(tab1); 3231 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3232 stream->print(" (%s of caller)", spname); 3233 stream->cr(); 3234 } 3235 } 3236 } 3237 } 3238 3239 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3240 // First, find an oopmap in (begin, end]. 3241 // We use the odd half-closed interval so that oop maps and scope descs 3242 // which are tied to the byte after a call are printed with the call itself. 3243 address base = code_begin(); 3244 ImmutableOopMapSet* oms = oop_maps(); 3245 if (oms != NULL) { 3246 for (int i = 0, imax = oms->count(); i < imax; i++) { 3247 const ImmutableOopMapPair* pair = oms->pair_at(i); 3248 const ImmutableOopMap* om = pair->get_from(oms); 3249 address pc = base + pair->pc_offset(); 3250 if (pc > begin) { 3251 if (pc <= end) { 3252 st->move_to(column); 3253 st->print("; "); 3254 om->print_on(st); 3255 } 3256 break; 3257 } 3258 } 3259 } 3260 3261 // Print any debug info present at this pc. 3262 ScopeDesc* sd = scope_desc_in(begin, end); 3263 if (sd != NULL) { 3264 st->move_to(column); 3265 if (sd->bci() == SynchronizationEntryBCI) { 3266 st->print(";*synchronization entry"); 3267 } else { 3268 if (sd->method() == NULL) { 3269 st->print("method is NULL"); 3270 } else if (sd->method()->is_native()) { 3271 st->print("method is native"); 3272 } else { 3273 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3274 st->print(";*%s", Bytecodes::name(bc)); 3275 switch (bc) { 3276 case Bytecodes::_invokevirtual: 3277 case Bytecodes::_invokespecial: 3278 case Bytecodes::_invokestatic: 3279 case Bytecodes::_invokeinterface: 3280 { 3281 Bytecode_invoke invoke(sd->method(), sd->bci()); 3282 st->print(" "); 3283 if (invoke.name() != NULL) 3284 invoke.name()->print_symbol_on(st); 3285 else 3286 st->print("<UNKNOWN>"); 3287 break; 3288 } 3289 case Bytecodes::_getfield: 3290 case Bytecodes::_putfield: 3291 case Bytecodes::_getstatic: 3292 case Bytecodes::_putstatic: 3293 { 3294 Bytecode_field field(sd->method(), sd->bci()); 3295 st->print(" "); 3296 if (field.name() != NULL) 3297 field.name()->print_symbol_on(st); 3298 else 3299 st->print("<UNKNOWN>"); 3300 } 3301 } 3302 } 3303 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3304 } 3305 3306 // Print all scopes 3307 for (;sd != NULL; sd = sd->sender()) { 3308 st->move_to(column); 3309 st->print("; -"); 3310 if (sd->method() == NULL) { 3311 st->print("method is NULL"); 3312 } else { 3313 sd->method()->print_short_name(st); 3314 } 3315 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3316 if (lineno != -1) { 3317 st->print("@%d (line %d)", sd->bci(), lineno); 3318 } else { 3319 st->print("@%d", sd->bci()); 3320 } 3321 st->cr(); 3322 } 3323 } 3324 3325 // Print relocation information 3326 const char* str = reloc_string_for(begin, end); 3327 if (str != NULL) { 3328 if (sd != NULL) st->cr(); 3329 st->move_to(column); 3330 st->print("; {%s}", str); 3331 } 3332 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3333 if (cont_offset != 0) { 3334 st->move_to(column); 3335 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3336 } 3337 3338 } 3339 3340 #ifndef PRODUCT 3341 3342 void nmethod::print_value_on(outputStream* st) const { 3343 st->print("nmethod"); 3344 print_on(st, NULL); 3345 } 3346 3347 void nmethod::print_calls(outputStream* st) { 3348 RelocIterator iter(this); 3349 while (iter.next()) { 3350 switch (iter.type()) { 3351 case relocInfo::virtual_call_type: 3352 case relocInfo::opt_virtual_call_type: { 3353 VerifyMutexLocker mc(CompiledIC_lock); 3354 CompiledIC_at(&iter)->print(); 3355 break; 3356 } 3357 case relocInfo::static_call_type: 3358 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3359 compiledStaticCall_at(iter.reloc())->print(); 3360 break; 3361 } 3362 } 3363 } 3364 3365 void nmethod::print_handler_table() { 3366 ExceptionHandlerTable(this).print(); 3367 } 3368 3369 void nmethod::print_nul_chk_table() { 3370 ImplicitExceptionTable(this).print(code_begin()); 3371 } 3372 3373 void nmethod::print_statistics() { 3374 ttyLocker ttyl; 3375 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3376 native_nmethod_stats.print_native_nmethod_stats(); 3377 #ifdef COMPILER1 3378 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3379 #endif 3380 #ifdef COMPILER2 3381 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3382 #endif 3383 #if INCLUDE_JVMCI 3384 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3385 #endif 3386 #ifdef SHARK 3387 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 3388 #endif 3389 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3390 DebugInformationRecorder::print_statistics(); 3391 #ifndef PRODUCT 3392 pc_nmethod_stats.print_pc_stats(); 3393 #endif 3394 Dependencies::print_statistics(); 3395 if (xtty != NULL) xtty->tail("statistics"); 3396 } 3397 3398 #endif // !PRODUCT 3399 3400 #if INCLUDE_JVMCI 3401 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 3402 if (!this->is_compiled_by_jvmci()) { 3403 return NULL; 3404 } 3405 oop installedCode = this->jvmci_installed_code(); 3406 if (installedCode != NULL) { 3407 oop installedCodeName = NULL; 3408 if (installedCode->is_a(InstalledCode::klass())) { 3409 installedCodeName = InstalledCode::name(installedCode); 3410 } 3411 if (installedCodeName != NULL) { 3412 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3413 } else { 3414 jio_snprintf(buf, buflen, "null"); 3415 return buf; 3416 } 3417 } 3418 jio_snprintf(buf, buflen, "noInstalledCode"); 3419 return buf; 3420 } 3421 #endif