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