1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nativeInst.hpp" 30 #include "code/nmethod.hpp" 31 #include "code/scopeDesc.hpp" 32 #include "compiler/abstractCompiler.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "compiler/compileLog.hpp" 35 #include "compiler/compilerOracle.hpp" 36 #include "compiler/disassembler.hpp" 37 #include "interpreter/bytecode.hpp" 38 #include "oops/methodData.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "prims/jvmtiRedefineClassesTrace.hpp" 41 #include "prims/jvmtiImpl.hpp" 42 #include "runtime/atomic.inline.hpp" 43 #include "runtime/orderAccess.inline.hpp" 44 #include "runtime/sharedRuntime.hpp" 45 #include "runtime/sweeper.hpp" 46 #include "utilities/resourceHash.hpp" 47 #include "utilities/dtrace.hpp" 48 #include "utilities/events.hpp" 49 #include "utilities/xmlstream.hpp" 50 #ifdef TARGET_ARCH_x86 51 # include "nativeInst_x86.hpp" 52 #endif 53 #ifdef TARGET_ARCH_sparc 54 # include "nativeInst_sparc.hpp" 55 #endif 56 #ifdef TARGET_ARCH_zero 57 # include "nativeInst_zero.hpp" 58 #endif 59 #ifdef TARGET_ARCH_arm 60 # include "nativeInst_arm.hpp" 61 #endif 62 #ifdef TARGET_ARCH_ppc 63 # include "nativeInst_ppc.hpp" 64 #endif 65 #ifdef SHARK 66 #include "shark/sharkCompiler.hpp" 67 #endif 68 #if INCLUDE_JVMCI 69 #include "jvmci/jvmciJavaClasses.hpp" 70 #endif 71 72 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 if ((PrintAssembly || CompilerOracle::should_print(method)) && nm != NULL) { 586 Disassembler::decode(nm); 587 } 588 } 589 // verify nmethod 590 debug_only(if (nm) nm->verify();) // might block 591 592 if (nm != NULL) { 593 nm->log_new_nmethod(); 594 } 595 596 return nm; 597 } 598 599 nmethod* nmethod::new_nmethod(const methodHandle& method, 600 int compile_id, 601 int entry_bci, 602 CodeOffsets* offsets, 603 int orig_pc_offset, 604 DebugInformationRecorder* debug_info, 605 Dependencies* dependencies, 606 CodeBuffer* code_buffer, int frame_size, 607 OopMapSet* oop_maps, 608 ExceptionHandlerTable* handler_table, 609 ImplicitExceptionTable* nul_chk_table, 610 AbstractCompiler* compiler, 611 int comp_level 612 #if INCLUDE_JVMCI 613 , Handle installed_code, 614 Handle speculationLog 615 #endif 616 ) 617 { 618 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 619 code_buffer->finalize_oop_references(method); 620 // create nmethod 621 nmethod* nm = NULL; 622 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 623 int nmethod_size = 624 allocation_size(code_buffer, sizeof(nmethod)) 625 + adjust_pcs_size(debug_info->pcs_size()) 626 + round_to(dependencies->size_in_bytes() , oopSize) 627 + round_to(handler_table->size_in_bytes(), oopSize) 628 + round_to(nul_chk_table->size_in_bytes(), oopSize) 629 + round_to(debug_info->data_size() , oopSize); 630 631 nm = new (nmethod_size, comp_level) 632 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 633 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 634 oop_maps, 635 handler_table, 636 nul_chk_table, 637 compiler, 638 comp_level 639 #if INCLUDE_JVMCI 640 , installed_code, 641 speculationLog 642 #endif 643 ); 644 645 if (nm != NULL) { 646 // To make dependency checking during class loading fast, record 647 // the nmethod dependencies in the classes it is dependent on. 648 // This allows the dependency checking code to simply walk the 649 // class hierarchy above the loaded class, checking only nmethods 650 // which are dependent on those classes. The slow way is to 651 // check every nmethod for dependencies which makes it linear in 652 // the number of methods compiled. For applications with a lot 653 // classes the slow way is too slow. 654 for (Dependencies::DepStream deps(nm); deps.next(); ) { 655 if (deps.type() == Dependencies::call_site_target_value) { 656 // CallSite dependencies are managed on per-CallSite instance basis. 657 oop call_site = deps.argument_oop(0); 658 MethodHandles::add_dependent_nmethod(call_site, nm); 659 } else { 660 Klass* klass = deps.context_type(); 661 if (klass == NULL) { 662 continue; // ignore things like evol_method 663 } 664 // record this nmethod as dependent on this klass 665 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 666 } 667 } 668 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 669 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 670 Disassembler::decode(nm); 671 } 672 } 673 } 674 // Do verification and logging outside CodeCache_lock. 675 if (nm != NULL) { 676 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 677 DEBUG_ONLY(nm->verify();) 678 nm->log_new_nmethod(); 679 } 680 return nm; 681 } 682 683 #ifdef _MSC_VER 684 #pragma warning(push) 685 #pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list 686 #endif 687 // For native wrappers 688 nmethod::nmethod( 689 Method* method, 690 int nmethod_size, 691 int compile_id, 692 CodeOffsets* offsets, 693 CodeBuffer* code_buffer, 694 int frame_size, 695 ByteSize basic_lock_owner_sp_offset, 696 ByteSize basic_lock_sp_offset, 697 OopMapSet* oop_maps ) 698 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 699 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 700 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 701 _native_basic_lock_sp_offset(basic_lock_sp_offset) 702 { 703 { 704 debug_only(No_Safepoint_Verifier nsv;) 705 assert_locked_or_safepoint(CodeCache_lock); 706 707 init_defaults(); 708 _method = method; 709 _entry_bci = InvocationEntryBci; 710 // We have no exception handler or deopt handler make the 711 // values something that will never match a pc like the nmethod vtable entry 712 _exception_offset = 0; 713 _deoptimize_offset = 0; 714 _deoptimize_mh_offset = 0; 715 _orig_pc_offset = 0; 716 717 _consts_offset = data_offset(); 718 _stub_offset = data_offset(); 719 _oops_offset = data_offset(); 720 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 721 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 722 _scopes_pcs_offset = _scopes_data_offset; 723 _dependencies_offset = _scopes_pcs_offset; 724 _handler_table_offset = _dependencies_offset; 725 _nul_chk_table_offset = _handler_table_offset; 726 _nmethod_end_offset = _nul_chk_table_offset; 727 _compile_id = compile_id; 728 _comp_level = CompLevel_none; 729 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 730 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 731 _osr_entry_point = NULL; 732 _exception_cache = NULL; 733 _pc_desc_cache.reset_to(NULL); 734 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 735 736 code_buffer->copy_values_to(this); 737 if (ScavengeRootsInCode) { 738 if (detect_scavenge_root_oops()) { 739 CodeCache::add_scavenge_root_nmethod(this); 740 } 741 Universe::heap()->register_nmethod(this); 742 } 743 debug_only(verify_scavenge_root_oops()); 744 CodeCache::commit(this); 745 } 746 747 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 748 ttyLocker ttyl; // keep the following output all in one block 749 // This output goes directly to the tty, not the compiler log. 750 // To enable tools to match it up with the compilation activity, 751 // be sure to tag this tty output with the compile ID. 752 if (xtty != NULL) { 753 xtty->begin_head("print_native_nmethod"); 754 xtty->method(_method); 755 xtty->stamp(); 756 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 757 } 758 // print the header part first 759 print(); 760 // then print the requested information 761 if (PrintNativeNMethods) { 762 print_code(); 763 if (oop_maps != NULL) { 764 oop_maps->print(); 765 } 766 } 767 if (PrintRelocations) { 768 print_relocations(); 769 } 770 if (xtty != NULL) { 771 xtty->tail("print_native_nmethod"); 772 } 773 } 774 } 775 776 #ifdef _MSC_VER 777 #pragma warning(pop) 778 #endif 779 780 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 781 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 782 } 783 784 nmethod::nmethod( 785 Method* method, 786 int nmethod_size, 787 int compile_id, 788 int entry_bci, 789 CodeOffsets* offsets, 790 int orig_pc_offset, 791 DebugInformationRecorder* debug_info, 792 Dependencies* dependencies, 793 CodeBuffer *code_buffer, 794 int frame_size, 795 OopMapSet* oop_maps, 796 ExceptionHandlerTable* handler_table, 797 ImplicitExceptionTable* nul_chk_table, 798 AbstractCompiler* compiler, 799 int comp_level 800 #if INCLUDE_JVMCI 801 , Handle installed_code, 802 Handle speculation_log 803 #endif 804 ) 805 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 806 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 807 _native_receiver_sp_offset(in_ByteSize(-1)), 808 _native_basic_lock_sp_offset(in_ByteSize(-1)) 809 { 810 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 811 { 812 debug_only(No_Safepoint_Verifier nsv;) 813 assert_locked_or_safepoint(CodeCache_lock); 814 815 init_defaults(); 816 _method = method; 817 _entry_bci = entry_bci; 818 _compile_id = compile_id; 819 _comp_level = comp_level; 820 _compiler = compiler; 821 _orig_pc_offset = orig_pc_offset; 822 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 823 824 // Section offsets 825 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 826 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 827 828 #if INCLUDE_JVMCI 829 _jvmci_installed_code = installed_code(); 830 _speculation_log = (instanceOop)speculation_log(); 831 832 if (compiler->is_jvmci()) { 833 // JVMCI might not produce any stub sections 834 if (offsets->value(CodeOffsets::Exceptions) != -1) { 835 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 836 } else { 837 _exception_offset = -1; 838 } 839 if (offsets->value(CodeOffsets::Deopt) != -1) { 840 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 841 } else { 842 _deoptimize_offset = -1; 843 } 844 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 845 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 846 } else { 847 _deoptimize_mh_offset = -1; 848 } 849 } else { 850 #endif 851 // Exception handler and deopt handler are in the stub section 852 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 853 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 854 855 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 856 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 857 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 858 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 859 } else { 860 _deoptimize_mh_offset = -1; 861 #if INCLUDE_JVMCI 862 } 863 #endif 864 } 865 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 866 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 867 } else { 868 _unwind_handler_offset = -1; 869 } 870 871 _oops_offset = data_offset(); 872 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 873 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 874 875 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 876 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 877 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 878 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 879 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 880 881 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 882 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 883 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 884 _exception_cache = NULL; 885 _pc_desc_cache.reset_to(scopes_pcs_begin()); 886 887 // Copy contents of ScopeDescRecorder to nmethod 888 code_buffer->copy_values_to(this); 889 debug_info->copy_to(this); 890 dependencies->copy_to(this); 891 if (ScavengeRootsInCode) { 892 if (detect_scavenge_root_oops()) { 893 CodeCache::add_scavenge_root_nmethod(this); 894 } 895 Universe::heap()->register_nmethod(this); 896 } 897 debug_only(verify_scavenge_root_oops()); 898 899 CodeCache::commit(this); 900 901 // Copy contents of ExceptionHandlerTable to nmethod 902 handler_table->copy_to(this); 903 nul_chk_table->copy_to(this); 904 905 // we use the information of entry points to find out if a method is 906 // static or non static 907 assert(compiler->is_c2() || compiler->is_jvmci() || 908 _method->is_static() == (entry_point() == _verified_entry_point), 909 " entry points must be same for static methods and vice versa"); 910 } 911 912 bool printnmethods = PrintNMethods || PrintNMethodsAtLevel == _comp_level 913 || CompilerOracle::should_print(_method) 914 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 915 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 916 print_nmethod(printnmethods); 917 } 918 } 919 920 // Print a short set of xml attributes to identify this nmethod. The 921 // output should be embedded in some other element. 922 void nmethod::log_identity(xmlStream* log) const { 923 log->print(" compile_id='%d'", compile_id()); 924 const char* nm_kind = compile_kind(); 925 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 926 if (compiler() != NULL) { 927 log->print(" compiler='%s'", compiler()->name()); 928 } 929 if (TieredCompilation) { 930 log->print(" level='%d'", comp_level()); 931 } 932 } 933 934 935 #define LOG_OFFSET(log, name) \ 936 if (p2i(name##_end()) - p2i(name##_begin())) \ 937 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 938 p2i(name##_begin()) - p2i(this)) 939 940 941 void nmethod::log_new_nmethod() const { 942 if (LogCompilation && xtty != NULL) { 943 ttyLocker ttyl; 944 HandleMark hm; 945 xtty->begin_elem("nmethod"); 946 log_identity(xtty); 947 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 948 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 949 950 LOG_OFFSET(xtty, relocation); 951 LOG_OFFSET(xtty, consts); 952 LOG_OFFSET(xtty, insts); 953 LOG_OFFSET(xtty, stub); 954 LOG_OFFSET(xtty, scopes_data); 955 LOG_OFFSET(xtty, scopes_pcs); 956 LOG_OFFSET(xtty, dependencies); 957 LOG_OFFSET(xtty, handler_table); 958 LOG_OFFSET(xtty, nul_chk_table); 959 LOG_OFFSET(xtty, oops); 960 LOG_OFFSET(xtty, metadata); 961 962 xtty->method(method()); 963 xtty->stamp(); 964 xtty->end_elem(); 965 } 966 } 967 968 #undef LOG_OFFSET 969 970 971 // Print out more verbose output usually for a newly created nmethod. 972 void nmethod::print_on(outputStream* st, const char* msg) const { 973 if (st != NULL) { 974 ttyLocker ttyl; 975 if (WizardMode) { 976 CompileTask::print(st, this, msg, /*short_form:*/ true); 977 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 978 } else { 979 CompileTask::print(st, this, msg, /*short_form:*/ false); 980 } 981 } 982 } 983 984 985 void nmethod::print_nmethod(bool printmethod) { 986 ttyLocker ttyl; // keep the following output all in one block 987 if (xtty != NULL) { 988 xtty->begin_head("print_nmethod"); 989 xtty->stamp(); 990 xtty->end_head(); 991 } 992 // print the header part first 993 print(); 994 // then print the requested information 995 if (printmethod) { 996 print_code(); 997 print_pcs(); 998 if (oop_maps()) { 999 oop_maps()->print(); 1000 } 1001 } 1002 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 1003 print_scopes(); 1004 } 1005 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 1006 print_relocations(); 1007 } 1008 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 1009 print_dependencies(); 1010 } 1011 if (PrintExceptionHandlers) { 1012 print_handler_table(); 1013 print_nul_chk_table(); 1014 } 1015 if (xtty != NULL) { 1016 xtty->tail("print_nmethod"); 1017 } 1018 } 1019 1020 1021 // Promote one word from an assembly-time handle to a live embedded oop. 1022 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1023 if (handle == NULL || 1024 // As a special case, IC oops are initialized to 1 or -1. 1025 handle == (jobject) Universe::non_oop_word()) { 1026 (*dest) = (oop) handle; 1027 } else { 1028 (*dest) = JNIHandles::resolve_non_null(handle); 1029 } 1030 } 1031 1032 1033 // Have to have the same name because it's called by a template 1034 void nmethod::copy_values(GrowableArray<jobject>* array) { 1035 int length = array->length(); 1036 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1037 oop* dest = oops_begin(); 1038 for (int index = 0 ; index < length; index++) { 1039 initialize_immediate_oop(&dest[index], array->at(index)); 1040 } 1041 1042 // Now we can fix up all the oops in the code. We need to do this 1043 // in the code because the assembler uses jobjects as placeholders. 1044 // The code and relocations have already been initialized by the 1045 // CodeBlob constructor, so it is valid even at this early point to 1046 // iterate over relocations and patch the code. 1047 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1048 } 1049 1050 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1051 int length = array->length(); 1052 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1053 Metadata** dest = metadata_begin(); 1054 for (int index = 0 ; index < length; index++) { 1055 dest[index] = array->at(index); 1056 } 1057 } 1058 1059 bool nmethod::is_at_poll_return(address pc) { 1060 RelocIterator iter(this, pc, pc+1); 1061 while (iter.next()) { 1062 if (iter.type() == relocInfo::poll_return_type) 1063 return true; 1064 } 1065 return false; 1066 } 1067 1068 1069 bool nmethod::is_at_poll_or_poll_return(address pc) { 1070 RelocIterator iter(this, pc, pc+1); 1071 while (iter.next()) { 1072 relocInfo::relocType t = iter.type(); 1073 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1074 return true; 1075 } 1076 return false; 1077 } 1078 1079 1080 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1081 // re-patch all oop-bearing instructions, just in case some oops moved 1082 RelocIterator iter(this, begin, end); 1083 while (iter.next()) { 1084 if (iter.type() == relocInfo::oop_type) { 1085 oop_Relocation* reloc = iter.oop_reloc(); 1086 if (initialize_immediates && reloc->oop_is_immediate()) { 1087 oop* dest = reloc->oop_addr(); 1088 initialize_immediate_oop(dest, (jobject) *dest); 1089 } 1090 // Refresh the oop-related bits of this instruction. 1091 reloc->fix_oop_relocation(); 1092 } else if (iter.type() == relocInfo::metadata_type) { 1093 metadata_Relocation* reloc = iter.metadata_reloc(); 1094 reloc->fix_metadata_relocation(); 1095 } 1096 } 1097 } 1098 1099 1100 void nmethod::verify_oop_relocations() { 1101 // Ensure sure that the code matches the current oop values 1102 RelocIterator iter(this, NULL, NULL); 1103 while (iter.next()) { 1104 if (iter.type() == relocInfo::oop_type) { 1105 oop_Relocation* reloc = iter.oop_reloc(); 1106 if (!reloc->oop_is_immediate()) { 1107 reloc->verify_oop_relocation(); 1108 } 1109 } 1110 } 1111 } 1112 1113 1114 ScopeDesc* nmethod::scope_desc_at(address pc) { 1115 PcDesc* pd = pc_desc_at(pc); 1116 guarantee(pd != NULL, "scope must be present"); 1117 return new ScopeDesc(this, pd->scope_decode_offset(), 1118 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 1119 pd->return_oop()); 1120 } 1121 1122 1123 void nmethod::clear_inline_caches() { 1124 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1125 if (is_zombie()) { 1126 return; 1127 } 1128 1129 RelocIterator iter(this); 1130 while (iter.next()) { 1131 iter.reloc()->clear_inline_cache(); 1132 } 1133 } 1134 1135 // Clear ICStubs of all compiled ICs 1136 void nmethod::clear_ic_stubs() { 1137 assert_locked_or_safepoint(CompiledIC_lock); 1138 RelocIterator iter(this); 1139 while(iter.next()) { 1140 if (iter.type() == relocInfo::virtual_call_type) { 1141 CompiledIC* ic = CompiledIC_at(&iter); 1142 ic->clear_ic_stub(); 1143 } 1144 } 1145 } 1146 1147 1148 void nmethod::cleanup_inline_caches() { 1149 assert_locked_or_safepoint(CompiledIC_lock); 1150 1151 // If the method is not entrant or zombie then a JMP is plastered over the 1152 // first few bytes. If an oop in the old code was there, that oop 1153 // should not get GC'd. Skip the first few bytes of oops on 1154 // not-entrant methods. 1155 address low_boundary = verified_entry_point(); 1156 if (!is_in_use()) { 1157 low_boundary += NativeJump::instruction_size; 1158 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1159 // This means that the low_boundary is going to be a little too high. 1160 // This shouldn't matter, since oops of non-entrant methods are never used. 1161 // In fact, why are we bothering to look at oops in a non-entrant method?? 1162 } 1163 1164 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1165 // zombie and unloaded nmethods. 1166 ResourceMark rm; 1167 RelocIterator iter(this, low_boundary); 1168 while(iter.next()) { 1169 switch(iter.type()) { 1170 case relocInfo::virtual_call_type: 1171 case relocInfo::opt_virtual_call_type: { 1172 CompiledIC *ic = CompiledIC_at(&iter); 1173 // Ok, to lookup references to zombies here 1174 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1175 if( cb != NULL && cb->is_nmethod() ) { 1176 nmethod* nm = (nmethod*)cb; 1177 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1178 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1179 } 1180 break; 1181 } 1182 case relocInfo::static_call_type: { 1183 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1184 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1185 if( cb != NULL && cb->is_nmethod() ) { 1186 nmethod* nm = (nmethod*)cb; 1187 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1188 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1189 } 1190 break; 1191 } 1192 } 1193 } 1194 } 1195 1196 void nmethod::verify_clean_inline_caches() { 1197 assert_locked_or_safepoint(CompiledIC_lock); 1198 1199 // If the method is not entrant or zombie then a JMP is plastered over the 1200 // first few bytes. If an oop in the old code was there, that oop 1201 // should not get GC'd. Skip the first few bytes of oops on 1202 // not-entrant methods. 1203 address low_boundary = verified_entry_point(); 1204 if (!is_in_use()) { 1205 low_boundary += NativeJump::instruction_size; 1206 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1207 // This means that the low_boundary is going to be a little too high. 1208 // This shouldn't matter, since oops of non-entrant methods are never used. 1209 // In fact, why are we bothering to look at oops in a non-entrant method?? 1210 } 1211 1212 ResourceMark rm; 1213 RelocIterator iter(this, low_boundary); 1214 while(iter.next()) { 1215 switch(iter.type()) { 1216 case relocInfo::virtual_call_type: 1217 case relocInfo::opt_virtual_call_type: { 1218 CompiledIC *ic = CompiledIC_at(&iter); 1219 // Ok, to lookup references to zombies here 1220 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1221 if( cb != NULL && cb->is_nmethod() ) { 1222 nmethod* nm = (nmethod*)cb; 1223 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1224 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1225 assert(ic->is_clean(), "IC should be clean"); 1226 } 1227 } 1228 break; 1229 } 1230 case relocInfo::static_call_type: { 1231 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1232 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1233 if( cb != NULL && cb->is_nmethod() ) { 1234 nmethod* nm = (nmethod*)cb; 1235 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1236 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1237 assert(csc->is_clean(), "IC should be clean"); 1238 } 1239 } 1240 break; 1241 } 1242 } 1243 } 1244 } 1245 1246 int nmethod::verify_icholder_relocations() { 1247 int count = 0; 1248 1249 RelocIterator iter(this); 1250 while(iter.next()) { 1251 if (iter.type() == relocInfo::virtual_call_type) { 1252 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1253 CompiledIC *ic = CompiledIC_at(&iter); 1254 if (TraceCompiledIC) { 1255 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1256 ic->print(); 1257 } 1258 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1259 count++; 1260 } 1261 } 1262 } 1263 1264 return count; 1265 } 1266 1267 // This is a private interface with the sweeper. 1268 void nmethod::mark_as_seen_on_stack() { 1269 assert(is_alive(), "Must be an alive method"); 1270 // Set the traversal mark to ensure that the sweeper does 2 1271 // cleaning passes before moving to zombie. 1272 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1273 } 1274 1275 // Tell if a non-entrant method can be converted to a zombie (i.e., 1276 // there are no activations on the stack, not in use by the VM, 1277 // and not in use by the ServiceThread) 1278 bool nmethod::can_convert_to_zombie() { 1279 assert(is_not_entrant(), "must be a non-entrant method"); 1280 1281 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1282 // count can be greater than the stack traversal count before it hits the 1283 // nmethod for the second time. 1284 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1285 !is_locked_by_vm(); 1286 } 1287 1288 void nmethod::inc_decompile_count() { 1289 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1290 // Could be gated by ProfileTraps, but do not bother... 1291 Method* m = method(); 1292 if (m == NULL) return; 1293 MethodData* mdo = m->method_data(); 1294 if (mdo == NULL) return; 1295 // There is a benign race here. See comments in methodData.hpp. 1296 mdo->inc_decompile_count(); 1297 } 1298 1299 void nmethod::increase_unloading_clock() { 1300 _global_unloading_clock++; 1301 if (_global_unloading_clock == 0) { 1302 // _nmethods are allocated with _unloading_clock == 0, 1303 // so 0 is never used as a clock value. 1304 _global_unloading_clock = 1; 1305 } 1306 } 1307 1308 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1309 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1310 } 1311 1312 unsigned char nmethod::unloading_clock() { 1313 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1314 } 1315 1316 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1317 1318 post_compiled_method_unload(); 1319 1320 // Since this nmethod is being unloaded, make sure that dependencies 1321 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1322 // indicate that this work is being done during a GC. 1323 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1324 assert(is_alive != NULL, "Should be non-NULL"); 1325 // A non-NULL is_alive closure indicates that this is being called during GC. 1326 flush_dependencies(is_alive); 1327 1328 // Break cycle between nmethod & method 1329 if (TraceClassUnloading && WizardMode) { 1330 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1331 " unloadable], Method*(" INTPTR_FORMAT 1332 "), cause(" INTPTR_FORMAT ")", 1333 p2i(this), p2i(_method), p2i(cause)); 1334 if (!Universe::heap()->is_gc_active()) 1335 cause->klass()->print(); 1336 } 1337 // Unlink the osr method, so we do not look this up again 1338 if (is_osr_method()) { 1339 invalidate_osr_method(); 1340 } 1341 // If _method is already NULL the Method* is about to be unloaded, 1342 // so we don't have to break the cycle. Note that it is possible to 1343 // have the Method* live here, in case we unload the nmethod because 1344 // it is pointing to some oop (other than the Method*) being unloaded. 1345 if (_method != NULL) { 1346 // OSR methods point to the Method*, but the Method* does not 1347 // point back! 1348 if (_method->code() == this) { 1349 _method->clear_code(); // Break a cycle 1350 } 1351 _method = NULL; // Clear the method of this dead nmethod 1352 } 1353 1354 // Make the class unloaded - i.e., change state and notify sweeper 1355 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1356 if (is_in_use()) { 1357 // Transitioning directly from live to unloaded -- so 1358 // we need to force a cache clean-up; remember this 1359 // for later on. 1360 CodeCache::set_needs_cache_clean(true); 1361 } 1362 1363 // Unregister must be done before the state change 1364 Universe::heap()->unregister_nmethod(this); 1365 1366 #if INCLUDE_JVMCI 1367 // The method can only be unloaded after the pointer to the installed code 1368 // Java wrapper is no longer alive. Here we need to clear out this weak 1369 // reference to the dead object. Nulling out the reference has to happen 1370 // after the method is unregistered since the original value may be still 1371 // tracked by the rset. 1372 if (_jvmci_installed_code != NULL) { 1373 InstalledCode::set_address(_jvmci_installed_code, 0); 1374 _jvmci_installed_code = NULL; 1375 } 1376 #endif 1377 1378 _state = unloaded; 1379 1380 // Log the unloading. 1381 log_state_change(); 1382 1383 // The Method* is gone at this point 1384 assert(_method == NULL, "Tautology"); 1385 1386 set_osr_link(NULL); 1387 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1388 NMethodSweeper::report_state_change(this); 1389 } 1390 1391 void nmethod::invalidate_osr_method() { 1392 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1393 // Remove from list of active nmethods 1394 if (method() != NULL) 1395 method()->method_holder()->remove_osr_nmethod(this); 1396 } 1397 1398 void nmethod::log_state_change() const { 1399 if (LogCompilation) { 1400 if (xtty != NULL) { 1401 ttyLocker ttyl; // keep the following output all in one block 1402 if (_state == unloaded) { 1403 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1404 os::current_thread_id()); 1405 } else { 1406 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1407 os::current_thread_id(), 1408 (_state == zombie ? " zombie='1'" : "")); 1409 } 1410 log_identity(xtty); 1411 xtty->stamp(); 1412 xtty->end_elem(); 1413 } 1414 } 1415 if (PrintCompilation && _state != unloaded) { 1416 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1417 } 1418 } 1419 1420 /** 1421 * Common functionality for both make_not_entrant and make_zombie 1422 */ 1423 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1424 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1425 assert(!is_zombie(), "should not already be a zombie"); 1426 1427 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1428 nmethodLocker nml(this); 1429 methodHandle the_method(method()); 1430 No_Safepoint_Verifier nsv; 1431 1432 // during patching, depending on the nmethod state we must notify the GC that 1433 // code has been unloaded, unregistering it. We cannot do this right while 1434 // holding the Patching_lock because we need to use the CodeCache_lock. This 1435 // would be prone to deadlocks. 1436 // This flag is used to remember whether we need to later lock and unregister. 1437 bool nmethod_needs_unregister = false; 1438 1439 { 1440 // invalidate osr nmethod before acquiring the patching lock since 1441 // they both acquire leaf locks and we don't want a deadlock. 1442 // This logic is equivalent to the logic below for patching the 1443 // verified entry point of regular methods. 1444 if (is_osr_method()) { 1445 // this effectively makes the osr nmethod not entrant 1446 invalidate_osr_method(); 1447 } 1448 1449 // Enter critical section. Does not block for safepoint. 1450 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1451 1452 if (_state == state) { 1453 // another thread already performed this transition so nothing 1454 // to do, but return false to indicate this. 1455 return false; 1456 } 1457 1458 // The caller can be calling the method statically or through an inline 1459 // cache call. 1460 if (!is_osr_method() && !is_not_entrant()) { 1461 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1462 SharedRuntime::get_handle_wrong_method_stub()); 1463 } 1464 1465 if (is_in_use()) { 1466 // It's a true state change, so mark the method as decompiled. 1467 // Do it only for transition from alive. 1468 inc_decompile_count(); 1469 } 1470 1471 // If the state is becoming a zombie, signal to unregister the nmethod with 1472 // the heap. 1473 // This nmethod may have already been unloaded during a full GC. 1474 if ((state == zombie) && !is_unloaded()) { 1475 nmethod_needs_unregister = true; 1476 } 1477 1478 // Must happen before state change. Otherwise we have a race condition in 1479 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1480 // transition its state from 'not_entrant' to 'zombie' without having to wait 1481 // for stack scanning. 1482 if (state == not_entrant) { 1483 mark_as_seen_on_stack(); 1484 OrderAccess::storestore(); 1485 } 1486 1487 // Change state 1488 _state = state; 1489 1490 // Log the transition once 1491 log_state_change(); 1492 1493 // Remove nmethod from method. 1494 // We need to check if both the _code and _from_compiled_code_entry_point 1495 // refer to this nmethod because there is a race in setting these two fields 1496 // in Method* as seen in bugid 4947125. 1497 // If the vep() points to the zombie nmethod, the memory for the nmethod 1498 // could be flushed and the compiler and vtable stubs could still call 1499 // through it. 1500 if (method() != NULL && (method()->code() == this || 1501 method()->from_compiled_entry() == verified_entry_point())) { 1502 HandleMark hm; 1503 method()->clear_code(); 1504 } 1505 } // leave critical region under Patching_lock 1506 1507 // When the nmethod becomes zombie it is no longer alive so the 1508 // dependencies must be flushed. nmethods in the not_entrant 1509 // state will be flushed later when the transition to zombie 1510 // happens or they get unloaded. 1511 if (state == zombie) { 1512 { 1513 // Flushing dependecies must be done before any possible 1514 // safepoint can sneak in, otherwise the oops used by the 1515 // dependency logic could have become stale. 1516 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1517 if (nmethod_needs_unregister) { 1518 Universe::heap()->unregister_nmethod(this); 1519 } 1520 flush_dependencies(NULL); 1521 } 1522 1523 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1524 // event and it hasn't already been reported for this nmethod then 1525 // report it now. The event may have been reported earilier if the GC 1526 // marked it for unloading). JvmtiDeferredEventQueue support means 1527 // we no longer go to a safepoint here. 1528 post_compiled_method_unload(); 1529 1530 #ifdef ASSERT 1531 // It's no longer safe to access the oops section since zombie 1532 // nmethods aren't scanned for GC. 1533 _oops_are_stale = true; 1534 #endif 1535 // the Method may be reclaimed by class unloading now that the 1536 // nmethod is in zombie state 1537 set_method(NULL); 1538 } else { 1539 assert(state == not_entrant, "other cases may need to be handled differently"); 1540 } 1541 #if INCLUDE_JVMCI 1542 if (_jvmci_installed_code != NULL) { 1543 // Break the link between nmethod and InstalledCode such that the nmethod can subsequently be flushed safely. 1544 InstalledCode::set_address(_jvmci_installed_code, 0); 1545 } 1546 #endif 1547 1548 if (TraceCreateZombies) { 1549 ResourceMark m; 1550 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"); 1551 } 1552 1553 NMethodSweeper::report_state_change(this); 1554 return true; 1555 } 1556 1557 void nmethod::flush() { 1558 // Note that there are no valid oops in the nmethod anymore. 1559 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1560 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1561 1562 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1563 assert_locked_or_safepoint(CodeCache_lock); 1564 1565 // completely deallocate this method 1566 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1567 if (PrintMethodFlushing) { 1568 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1569 "/Free CodeCache:" SIZE_FORMAT "Kb", 1570 _compile_id, p2i(this), CodeCache::nof_blobs(), 1571 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1572 } 1573 1574 // We need to deallocate any ExceptionCache data. 1575 // Note that we do not need to grab the nmethod lock for this, it 1576 // better be thread safe if we're disposing of it! 1577 ExceptionCache* ec = exception_cache(); 1578 set_exception_cache(NULL); 1579 while(ec != NULL) { 1580 ExceptionCache* next = ec->next(); 1581 delete ec; 1582 ec = next; 1583 } 1584 1585 if (on_scavenge_root_list()) { 1586 CodeCache::drop_scavenge_root_nmethod(this); 1587 } 1588 1589 #ifdef SHARK 1590 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1591 #endif // SHARK 1592 1593 ((CodeBlob*)(this))->flush(); 1594 1595 CodeCache::free(this); 1596 } 1597 1598 // 1599 // Notify all classes this nmethod is dependent on that it is no 1600 // longer dependent. This should only be called in two situations. 1601 // First, when a nmethod transitions to a zombie all dependents need 1602 // to be clear. Since zombification happens at a safepoint there's no 1603 // synchronization issues. The second place is a little more tricky. 1604 // During phase 1 of mark sweep class unloading may happen and as a 1605 // result some nmethods may get unloaded. In this case the flushing 1606 // of dependencies must happen during phase 1 since after GC any 1607 // dependencies in the unloaded nmethod won't be updated, so 1608 // traversing the dependency information in unsafe. In that case this 1609 // function is called with a non-NULL argument and this function only 1610 // notifies instanceKlasses that are reachable 1611 1612 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1613 assert_locked_or_safepoint(CodeCache_lock); 1614 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1615 "is_alive is non-NULL if and only if we are called during GC"); 1616 if (!has_flushed_dependencies()) { 1617 set_has_flushed_dependencies(); 1618 for (Dependencies::DepStream deps(this); deps.next(); ) { 1619 if (deps.type() == Dependencies::call_site_target_value) { 1620 // CallSite dependencies are managed on per-CallSite instance basis. 1621 oop call_site = deps.argument_oop(0); 1622 MethodHandles::remove_dependent_nmethod(call_site, this); 1623 } else { 1624 Klass* klass = deps.context_type(); 1625 if (klass == NULL) { 1626 continue; // ignore things like evol_method 1627 } 1628 // During GC the is_alive closure is non-NULL, and is used to 1629 // determine liveness of dependees that need to be updated. 1630 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1631 // The GC defers deletion of this entry, since there might be multiple threads 1632 // iterating over the _dependencies graph. Other call paths are single-threaded 1633 // and may delete it immediately. 1634 bool delete_immediately = is_alive == NULL; 1635 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1636 } 1637 } 1638 } 1639 } 1640 } 1641 1642 1643 // If this oop is not live, the nmethod can be unloaded. 1644 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1645 assert(root != NULL, "just checking"); 1646 oop obj = *root; 1647 if (obj == NULL || is_alive->do_object_b(obj)) { 1648 return false; 1649 } 1650 1651 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1652 // simply because one of its constant oops has gone dead. 1653 // No actual classes need to be unloaded in order for this to occur. 1654 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1655 make_unloaded(is_alive, obj); 1656 return true; 1657 } 1658 1659 // ------------------------------------------------------------------ 1660 // post_compiled_method_load_event 1661 // new method for install_code() path 1662 // Transfer information from compilation to jvmti 1663 void nmethod::post_compiled_method_load_event() { 1664 1665 Method* moop = method(); 1666 HOTSPOT_COMPILED_METHOD_LOAD( 1667 (char *) moop->klass_name()->bytes(), 1668 moop->klass_name()->utf8_length(), 1669 (char *) moop->name()->bytes(), 1670 moop->name()->utf8_length(), 1671 (char *) moop->signature()->bytes(), 1672 moop->signature()->utf8_length(), 1673 insts_begin(), insts_size()); 1674 1675 if (JvmtiExport::should_post_compiled_method_load() || 1676 JvmtiExport::should_post_compiled_method_unload()) { 1677 get_and_cache_jmethod_id(); 1678 } 1679 1680 if (JvmtiExport::should_post_compiled_method_load()) { 1681 // Let the Service thread (which is a real Java thread) post the event 1682 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1683 JvmtiDeferredEventQueue::enqueue( 1684 JvmtiDeferredEvent::compiled_method_load_event(this)); 1685 } 1686 } 1687 1688 jmethodID nmethod::get_and_cache_jmethod_id() { 1689 if (_jmethod_id == NULL) { 1690 // Cache the jmethod_id since it can no longer be looked up once the 1691 // method itself has been marked for unloading. 1692 _jmethod_id = method()->jmethod_id(); 1693 } 1694 return _jmethod_id; 1695 } 1696 1697 void nmethod::post_compiled_method_unload() { 1698 if (unload_reported()) { 1699 // During unloading we transition to unloaded and then to zombie 1700 // and the unloading is reported during the first transition. 1701 return; 1702 } 1703 1704 assert(_method != NULL && !is_unloaded(), "just checking"); 1705 DTRACE_METHOD_UNLOAD_PROBE(method()); 1706 1707 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1708 // post the event. Sometime later this nmethod will be made a zombie 1709 // by the sweeper but the Method* will not be valid at that point. 1710 // If the _jmethod_id is null then no load event was ever requested 1711 // so don't bother posting the unload. The main reason for this is 1712 // that the jmethodID is a weak reference to the Method* so if 1713 // it's being unloaded there's no way to look it up since the weak 1714 // ref will have been cleared. 1715 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1716 assert(!unload_reported(), "already unloaded"); 1717 JvmtiDeferredEvent event = 1718 JvmtiDeferredEvent::compiled_method_unload_event(this, 1719 _jmethod_id, insts_begin()); 1720 if (SafepointSynchronize::is_at_safepoint()) { 1721 // Don't want to take the queueing lock. Add it as pending and 1722 // it will get enqueued later. 1723 JvmtiDeferredEventQueue::add_pending_event(event); 1724 } else { 1725 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1726 JvmtiDeferredEventQueue::enqueue(event); 1727 } 1728 } 1729 1730 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1731 // any time. As the nmethod is being unloaded now we mark it has 1732 // having the unload event reported - this will ensure that we don't 1733 // attempt to report the event in the unlikely scenario where the 1734 // event is enabled at the time the nmethod is made a zombie. 1735 set_unload_reported(); 1736 } 1737 1738 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1739 if (ic->is_icholder_call()) { 1740 // The only exception is compiledICHolder oops which may 1741 // yet be marked below. (We check this further below). 1742 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1743 1744 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1745 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1746 return; 1747 } 1748 } else { 1749 Metadata* ic_oop = ic->cached_metadata(); 1750 if (ic_oop != NULL) { 1751 if (ic_oop->is_klass()) { 1752 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1753 return; 1754 } 1755 } else if (ic_oop->is_method()) { 1756 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1757 return; 1758 } 1759 } else { 1760 ShouldNotReachHere(); 1761 } 1762 } 1763 } 1764 1765 ic->set_to_clean(); 1766 } 1767 1768 // This is called at the end of the strong tracing/marking phase of a 1769 // GC to unload an nmethod if it contains otherwise unreachable 1770 // oops. 1771 1772 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1773 // Make sure the oop's ready to receive visitors 1774 assert(!is_zombie() && !is_unloaded(), 1775 "should not call follow on zombie or unloaded nmethod"); 1776 1777 // If the method is not entrant then a JMP is plastered over the 1778 // first few bytes. If an oop in the old code was there, that oop 1779 // should not get GC'd. Skip the first few bytes of oops on 1780 // not-entrant methods. 1781 address low_boundary = verified_entry_point(); 1782 if (is_not_entrant()) { 1783 low_boundary += NativeJump::instruction_size; 1784 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1785 // (See comment above.) 1786 } 1787 1788 // The RedefineClasses() API can cause the class unloading invariant 1789 // to no longer be true. See jvmtiExport.hpp for details. 1790 // Also, leave a debugging breadcrumb in local flag. 1791 if (JvmtiExport::has_redefined_a_class()) { 1792 // This set of the unloading_occurred flag is done before the 1793 // call to post_compiled_method_unload() so that the unloading 1794 // of this nmethod is reported. 1795 unloading_occurred = true; 1796 } 1797 1798 // Exception cache 1799 clean_exception_cache(is_alive); 1800 1801 // If class unloading occurred we first iterate over all inline caches and 1802 // clear ICs where the cached oop is referring to an unloaded klass or method. 1803 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1804 // iteration below. 1805 if (unloading_occurred) { 1806 RelocIterator iter(this, low_boundary); 1807 while(iter.next()) { 1808 if (iter.type() == relocInfo::virtual_call_type) { 1809 CompiledIC *ic = CompiledIC_at(&iter); 1810 clean_ic_if_metadata_is_dead(ic, is_alive); 1811 } 1812 } 1813 } 1814 1815 // Compiled code 1816 { 1817 RelocIterator iter(this, low_boundary); 1818 while (iter.next()) { 1819 if (iter.type() == relocInfo::oop_type) { 1820 oop_Relocation* r = iter.oop_reloc(); 1821 // In this loop, we must only traverse those oops directly embedded in 1822 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1823 assert(1 == (r->oop_is_immediate()) + 1824 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1825 "oop must be found in exactly one place"); 1826 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1827 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1828 return; 1829 } 1830 } 1831 } 1832 } 1833 } 1834 1835 1836 // Scopes 1837 for (oop* p = oops_begin(); p < oops_end(); p++) { 1838 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1839 if (can_unload(is_alive, p, unloading_occurred)) { 1840 return; 1841 } 1842 } 1843 1844 #if INCLUDE_JVMCI 1845 // Follow JVMCI method 1846 BarrierSet* bs = Universe::heap()->barrier_set(); 1847 if (_jvmci_installed_code != NULL) { 1848 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1849 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1850 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 1851 _jvmci_installed_code = NULL; 1852 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 1853 } 1854 } else { 1855 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1856 return; 1857 } 1858 } 1859 } 1860 1861 if (_speculation_log != NULL) { 1862 if (!is_alive->do_object_b(_speculation_log)) { 1863 bs->write_ref_nmethod_pre(&_speculation_log, this); 1864 _speculation_log = NULL; 1865 bs->write_ref_nmethod_post(&_speculation_log, this); 1866 } 1867 } 1868 #endif 1869 1870 1871 // Ensure that all metadata is still alive 1872 verify_metadata_loaders(low_boundary, is_alive); 1873 } 1874 1875 template <class CompiledICorStaticCall> 1876 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1877 // Ok, to lookup references to zombies here 1878 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1879 if (cb != NULL && cb->is_nmethod()) { 1880 nmethod* nm = (nmethod*)cb; 1881 1882 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1883 // The nmethod has not been processed yet. 1884 return true; 1885 } 1886 1887 // Clean inline caches pointing to both zombie and not_entrant methods 1888 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1889 ic->set_to_clean(); 1890 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); 1891 } 1892 } 1893 1894 return false; 1895 } 1896 1897 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1898 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1899 } 1900 1901 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1902 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1903 } 1904 1905 bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1906 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1907 1908 oop_Relocation* r = iter_at_oop->oop_reloc(); 1909 // Traverse those oops directly embedded in the code. 1910 // Other oops (oop_index>0) are seen as part of scopes_oops. 1911 assert(1 == (r->oop_is_immediate()) + 1912 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1913 "oop must be found in exactly one place"); 1914 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1915 // Unload this nmethod if the oop is dead. 1916 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1917 return true;; 1918 } 1919 } 1920 1921 return false; 1922 } 1923 1924 1925 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1926 ResourceMark rm; 1927 1928 // Make sure the oop's ready to receive visitors 1929 assert(!is_zombie() && !is_unloaded(), 1930 "should not call follow on zombie or unloaded nmethod"); 1931 1932 // If the method is not entrant then a JMP is plastered over the 1933 // first few bytes. If an oop in the old code was there, that oop 1934 // should not get GC'd. Skip the first few bytes of oops on 1935 // not-entrant methods. 1936 address low_boundary = verified_entry_point(); 1937 if (is_not_entrant()) { 1938 low_boundary += NativeJump::instruction_size; 1939 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1940 // (See comment above.) 1941 } 1942 1943 // The RedefineClasses() API can cause the class unloading invariant 1944 // to no longer be true. See jvmtiExport.hpp for details. 1945 // Also, leave a debugging breadcrumb in local flag. 1946 if (JvmtiExport::has_redefined_a_class()) { 1947 // This set of the unloading_occurred flag is done before the 1948 // call to post_compiled_method_unload() so that the unloading 1949 // of this nmethod is reported. 1950 unloading_occurred = true; 1951 } 1952 1953 #if INCLUDE_JVMCI 1954 // Follow JVMCI method 1955 if (_jvmci_installed_code != NULL) { 1956 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1957 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1958 _jvmci_installed_code = NULL; 1959 } 1960 } else { 1961 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1962 return false; 1963 } 1964 } 1965 } 1966 1967 if (_speculation_log != NULL) { 1968 if (!is_alive->do_object_b(_speculation_log)) { 1969 _speculation_log = NULL; 1970 } 1971 } 1972 #endif 1973 1974 // Exception cache 1975 clean_exception_cache(is_alive); 1976 1977 bool is_unloaded = false; 1978 bool postponed = false; 1979 1980 RelocIterator iter(this, low_boundary); 1981 while(iter.next()) { 1982 1983 switch (iter.type()) { 1984 1985 case relocInfo::virtual_call_type: 1986 if (unloading_occurred) { 1987 // If class unloading occurred we first iterate over all inline caches and 1988 // clear ICs where the cached oop is referring to an unloaded klass or method. 1989 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1990 } 1991 1992 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1993 break; 1994 1995 case relocInfo::opt_virtual_call_type: 1996 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1997 break; 1998 1999 case relocInfo::static_call_type: 2000 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2001 break; 2002 2003 case relocInfo::oop_type: 2004 if (!is_unloaded) { 2005 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 2006 } 2007 break; 2008 2009 case relocInfo::metadata_type: 2010 break; // nothing to do. 2011 } 2012 } 2013 2014 if (is_unloaded) { 2015 return postponed; 2016 } 2017 2018 // Scopes 2019 for (oop* p = oops_begin(); p < oops_end(); p++) { 2020 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2021 if (can_unload(is_alive, p, unloading_occurred)) { 2022 is_unloaded = true; 2023 break; 2024 } 2025 } 2026 2027 if (is_unloaded) { 2028 return postponed; 2029 } 2030 2031 #if INCLUDE_JVMCI 2032 // Follow JVMCI method 2033 BarrierSet* bs = Universe::heap()->barrier_set(); 2034 if (_jvmci_installed_code != NULL) { 2035 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 2036 if (!is_alive->do_object_b(_jvmci_installed_code)) { 2037 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2038 _jvmci_installed_code = NULL; 2039 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2040 } 2041 } else { 2042 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 2043 is_unloaded = true; 2044 } 2045 } 2046 } 2047 2048 if (_speculation_log != NULL) { 2049 if (!is_alive->do_object_b(_speculation_log)) { 2050 bs->write_ref_nmethod_pre(&_speculation_log, this); 2051 _speculation_log = NULL; 2052 bs->write_ref_nmethod_post(&_speculation_log, this); 2053 } 2054 } 2055 #endif 2056 2057 // Ensure that all metadata is still alive 2058 verify_metadata_loaders(low_boundary, is_alive); 2059 2060 return postponed; 2061 } 2062 2063 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2064 ResourceMark rm; 2065 2066 // Make sure the oop's ready to receive visitors 2067 assert(!is_zombie(), 2068 "should not call follow on zombie nmethod"); 2069 2070 // If the method is not entrant then a JMP is plastered over the 2071 // first few bytes. If an oop in the old code was there, that oop 2072 // should not get GC'd. Skip the first few bytes of oops on 2073 // not-entrant methods. 2074 address low_boundary = verified_entry_point(); 2075 if (is_not_entrant()) { 2076 low_boundary += NativeJump::instruction_size; 2077 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2078 // (See comment above.) 2079 } 2080 2081 RelocIterator iter(this, low_boundary); 2082 while(iter.next()) { 2083 2084 switch (iter.type()) { 2085 2086 case relocInfo::virtual_call_type: 2087 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2088 break; 2089 2090 case relocInfo::opt_virtual_call_type: 2091 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2092 break; 2093 2094 case relocInfo::static_call_type: 2095 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2096 break; 2097 } 2098 } 2099 } 2100 2101 #ifdef ASSERT 2102 2103 class CheckClass : AllStatic { 2104 static BoolObjectClosure* _is_alive; 2105 2106 // Check class_loader is alive for this bit of metadata. 2107 static void check_class(Metadata* md) { 2108 Klass* klass = NULL; 2109 if (md->is_klass()) { 2110 klass = ((Klass*)md); 2111 } else if (md->is_method()) { 2112 klass = ((Method*)md)->method_holder(); 2113 } else if (md->is_methodData()) { 2114 klass = ((MethodData*)md)->method()->method_holder(); 2115 } else { 2116 md->print(); 2117 ShouldNotReachHere(); 2118 } 2119 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2120 } 2121 public: 2122 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2123 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2124 _is_alive = is_alive; 2125 nm->metadata_do(check_class); 2126 } 2127 }; 2128 2129 // This is called during a safepoint so can use static data 2130 BoolObjectClosure* CheckClass::_is_alive = NULL; 2131 #endif // ASSERT 2132 2133 2134 // Processing of oop references should have been sufficient to keep 2135 // all strong references alive. Any weak references should have been 2136 // cleared as well. Visit all the metadata and ensure that it's 2137 // really alive. 2138 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2139 #ifdef ASSERT 2140 RelocIterator iter(this, low_boundary); 2141 while (iter.next()) { 2142 // static_stub_Relocations may have dangling references to 2143 // Method*s so trim them out here. Otherwise it looks like 2144 // compiled code is maintaining a link to dead metadata. 2145 address static_call_addr = NULL; 2146 if (iter.type() == relocInfo::opt_virtual_call_type) { 2147 CompiledIC* cic = CompiledIC_at(&iter); 2148 if (!cic->is_call_to_interpreted()) { 2149 static_call_addr = iter.addr(); 2150 } 2151 } else if (iter.type() == relocInfo::static_call_type) { 2152 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2153 if (!csc->is_call_to_interpreted()) { 2154 static_call_addr = iter.addr(); 2155 } 2156 } 2157 if (static_call_addr != NULL) { 2158 RelocIterator sciter(this, low_boundary); 2159 while (sciter.next()) { 2160 if (sciter.type() == relocInfo::static_stub_type && 2161 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2162 sciter.static_stub_reloc()->clear_inline_cache(); 2163 } 2164 } 2165 } 2166 } 2167 // Check that the metadata embedded in the nmethod is alive 2168 CheckClass::do_check_class(is_alive, this); 2169 #endif 2170 } 2171 2172 2173 // Iterate over metadata calling this function. Used by RedefineClasses 2174 void nmethod::metadata_do(void f(Metadata*)) { 2175 address low_boundary = verified_entry_point(); 2176 if (is_not_entrant()) { 2177 low_boundary += NativeJump::instruction_size; 2178 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2179 // (See comment above.) 2180 } 2181 { 2182 // Visit all immediate references that are embedded in the instruction stream. 2183 RelocIterator iter(this, low_boundary); 2184 while (iter.next()) { 2185 if (iter.type() == relocInfo::metadata_type ) { 2186 metadata_Relocation* r = iter.metadata_reloc(); 2187 // In this metadata, we must only follow those metadatas directly embedded in 2188 // the code. Other metadatas (oop_index>0) are seen as part of 2189 // the metadata section below. 2190 assert(1 == (r->metadata_is_immediate()) + 2191 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2192 "metadata must be found in exactly one place"); 2193 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2194 Metadata* md = r->metadata_value(); 2195 if (md != _method) f(md); 2196 } 2197 } else if (iter.type() == relocInfo::virtual_call_type) { 2198 // Check compiledIC holders associated with this nmethod 2199 CompiledIC *ic = CompiledIC_at(&iter); 2200 if (ic->is_icholder_call()) { 2201 CompiledICHolder* cichk = ic->cached_icholder(); 2202 f(cichk->holder_method()); 2203 f(cichk->holder_klass()); 2204 } else { 2205 Metadata* ic_oop = ic->cached_metadata(); 2206 if (ic_oop != NULL) { 2207 f(ic_oop); 2208 } 2209 } 2210 } 2211 } 2212 } 2213 2214 // Visit the metadata section 2215 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2216 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2217 Metadata* md = *p; 2218 f(md); 2219 } 2220 2221 // Visit metadata not embedded in the other places. 2222 if (_method != NULL) f(_method); 2223 } 2224 2225 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2226 // make sure the oops ready to receive visitors 2227 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2228 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2229 2230 // If the method is not entrant or zombie then a JMP is plastered over the 2231 // first few bytes. If an oop in the old code was there, that oop 2232 // should not get GC'd. Skip the first few bytes of oops on 2233 // not-entrant methods. 2234 address low_boundary = verified_entry_point(); 2235 if (is_not_entrant()) { 2236 low_boundary += NativeJump::instruction_size; 2237 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2238 // (See comment above.) 2239 } 2240 2241 #if INCLUDE_JVMCI 2242 if (_jvmci_installed_code != NULL) { 2243 f->do_oop((oop*) &_jvmci_installed_code); 2244 } 2245 if (_speculation_log != NULL) { 2246 f->do_oop((oop*) &_speculation_log); 2247 } 2248 #endif 2249 2250 RelocIterator iter(this, low_boundary); 2251 2252 while (iter.next()) { 2253 if (iter.type() == relocInfo::oop_type ) { 2254 oop_Relocation* r = iter.oop_reloc(); 2255 // In this loop, we must only follow those oops directly embedded in 2256 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2257 assert(1 == (r->oop_is_immediate()) + 2258 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2259 "oop must be found in exactly one place"); 2260 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2261 f->do_oop(r->oop_addr()); 2262 } 2263 } 2264 } 2265 2266 // Scopes 2267 // This includes oop constants not inlined in the code stream. 2268 for (oop* p = oops_begin(); p < oops_end(); p++) { 2269 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2270 f->do_oop(p); 2271 } 2272 } 2273 2274 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2275 2276 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2277 2278 // An nmethod is "marked" if its _mark_link is set non-null. 2279 // Even if it is the end of the linked list, it will have a non-null link value, 2280 // as long as it is on the list. 2281 // This code must be MP safe, because it is used from parallel GC passes. 2282 bool nmethod::test_set_oops_do_mark() { 2283 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2284 nmethod* observed_mark_link = _oops_do_mark_link; 2285 if (observed_mark_link == NULL) { 2286 // Claim this nmethod for this thread to mark. 2287 observed_mark_link = (nmethod*) 2288 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2289 if (observed_mark_link == NULL) { 2290 2291 // Atomically append this nmethod (now claimed) to the head of the list: 2292 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2293 for (;;) { 2294 nmethod* required_mark_nmethods = observed_mark_nmethods; 2295 _oops_do_mark_link = required_mark_nmethods; 2296 observed_mark_nmethods = (nmethod*) 2297 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2298 if (observed_mark_nmethods == required_mark_nmethods) 2299 break; 2300 } 2301 // Mark was clear when we first saw this guy. 2302 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2303 return false; 2304 } 2305 } 2306 // On fall through, another racing thread marked this nmethod before we did. 2307 return true; 2308 } 2309 2310 void nmethod::oops_do_marking_prologue() { 2311 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2312 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2313 // We use cmpxchg_ptr instead of regular assignment here because the user 2314 // may fork a bunch of threads, and we need them all to see the same state. 2315 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2316 guarantee(observed == NULL, "no races in this sequential code"); 2317 } 2318 2319 void nmethod::oops_do_marking_epilogue() { 2320 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2321 nmethod* cur = _oops_do_mark_nmethods; 2322 while (cur != NMETHOD_SENTINEL) { 2323 assert(cur != NULL, "not NULL-terminated"); 2324 nmethod* next = cur->_oops_do_mark_link; 2325 cur->_oops_do_mark_link = NULL; 2326 cur->verify_oop_relocations(); 2327 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2328 cur = next; 2329 } 2330 void* required = _oops_do_mark_nmethods; 2331 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2332 guarantee(observed == required, "no races in this sequential code"); 2333 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2334 } 2335 2336 class DetectScavengeRoot: public OopClosure { 2337 bool _detected_scavenge_root; 2338 public: 2339 DetectScavengeRoot() : _detected_scavenge_root(false) 2340 { NOT_PRODUCT(_print_nm = NULL); } 2341 bool detected_scavenge_root() { return _detected_scavenge_root; } 2342 virtual void do_oop(oop* p) { 2343 if ((*p) != NULL && (*p)->is_scavengable()) { 2344 NOT_PRODUCT(maybe_print(p)); 2345 _detected_scavenge_root = true; 2346 } 2347 } 2348 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2349 2350 #ifndef PRODUCT 2351 nmethod* _print_nm; 2352 void maybe_print(oop* p) { 2353 if (_print_nm == NULL) return; 2354 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2355 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2356 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 2357 p2i(*p), p2i(p)); 2358 (*p)->print(); 2359 } 2360 #endif //PRODUCT 2361 }; 2362 2363 bool nmethod::detect_scavenge_root_oops() { 2364 DetectScavengeRoot detect_scavenge_root; 2365 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2366 oops_do(&detect_scavenge_root); 2367 return detect_scavenge_root.detected_scavenge_root(); 2368 } 2369 2370 // Method that knows how to preserve outgoing arguments at call. This method must be 2371 // called with a frame corresponding to a Java invoke 2372 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2373 #ifndef SHARK 2374 if (method() != NULL && !method()->is_native()) { 2375 SimpleScopeDesc ssd(this, fr.pc()); 2376 Bytecode_invoke call(ssd.method(), ssd.bci()); 2377 bool has_receiver = call.has_receiver(); 2378 bool has_appendix = call.has_appendix(); 2379 Symbol* signature = call.signature(); 2380 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2381 } 2382 #endif // !SHARK 2383 } 2384 2385 inline bool includes(void* p, void* from, void* to) { 2386 return from <= p && p < to; 2387 } 2388 2389 2390 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2391 assert(count >= 2, "must be sentinel values, at least"); 2392 2393 #ifdef ASSERT 2394 // must be sorted and unique; we do a binary search in find_pc_desc() 2395 int prev_offset = pcs[0].pc_offset(); 2396 assert(prev_offset == PcDesc::lower_offset_limit, 2397 "must start with a sentinel"); 2398 for (int i = 1; i < count; i++) { 2399 int this_offset = pcs[i].pc_offset(); 2400 assert(this_offset > prev_offset, "offsets must be sorted"); 2401 prev_offset = this_offset; 2402 } 2403 assert(prev_offset == PcDesc::upper_offset_limit, 2404 "must end with a sentinel"); 2405 #endif //ASSERT 2406 2407 // Search for MethodHandle invokes and tag the nmethod. 2408 for (int i = 0; i < count; i++) { 2409 if (pcs[i].is_method_handle_invoke()) { 2410 set_has_method_handle_invokes(true); 2411 break; 2412 } 2413 } 2414 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2415 2416 int size = count * sizeof(PcDesc); 2417 assert(scopes_pcs_size() >= size, "oob"); 2418 memcpy(scopes_pcs_begin(), pcs, size); 2419 2420 // Adjust the final sentinel downward. 2421 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2422 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2423 last_pc->set_pc_offset(content_size() + 1); 2424 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2425 // Fill any rounding gaps with copies of the last record. 2426 last_pc[1] = last_pc[0]; 2427 } 2428 // The following assert could fail if sizeof(PcDesc) is not 2429 // an integral multiple of oopSize (the rounding term). 2430 // If it fails, change the logic to always allocate a multiple 2431 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2432 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2433 } 2434 2435 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2436 assert(scopes_data_size() >= size, "oob"); 2437 memcpy(scopes_data_begin(), buffer, size); 2438 } 2439 2440 // When using JVMCI the address might be off by the size of a call instruction. 2441 bool nmethod::is_deopt_entry(address pc) { 2442 return pc == deopt_handler_begin() 2443 #if INCLUDE_JVMCI 2444 || pc == (deopt_handler_begin() + NativeCall::instruction_size) 2445 #endif 2446 ; 2447 } 2448 2449 #ifdef ASSERT 2450 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2451 PcDesc* lower = nm->scopes_pcs_begin(); 2452 PcDesc* upper = nm->scopes_pcs_end(); 2453 lower += 1; // exclude initial sentinel 2454 PcDesc* res = NULL; 2455 for (PcDesc* p = lower; p < upper; p++) { 2456 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2457 if (match_desc(p, pc_offset, approximate)) { 2458 if (res == NULL) 2459 res = p; 2460 else 2461 res = (PcDesc*) badAddress; 2462 } 2463 } 2464 return res; 2465 } 2466 #endif 2467 2468 2469 // Finds a PcDesc with real-pc equal to "pc" 2470 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2471 address base_address = code_begin(); 2472 if ((pc < base_address) || 2473 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2474 return NULL; // PC is wildly out of range 2475 } 2476 int pc_offset = (int) (pc - base_address); 2477 2478 // Check the PcDesc cache if it contains the desired PcDesc 2479 // (This as an almost 100% hit rate.) 2480 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2481 if (res != NULL) { 2482 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2483 return res; 2484 } 2485 2486 // Fallback algorithm: quasi-linear search for the PcDesc 2487 // Find the last pc_offset less than the given offset. 2488 // The successor must be the required match, if there is a match at all. 2489 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2490 PcDesc* lower = scopes_pcs_begin(); 2491 PcDesc* upper = scopes_pcs_end(); 2492 upper -= 1; // exclude final sentinel 2493 if (lower >= upper) return NULL; // native method; no PcDescs at all 2494 2495 #define assert_LU_OK \ 2496 /* invariant on lower..upper during the following search: */ \ 2497 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2498 assert(upper->pc_offset() >= pc_offset, "sanity") 2499 assert_LU_OK; 2500 2501 // Use the last successful return as a split point. 2502 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 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 } 2509 2510 // Take giant steps at first (4096, then 256, then 16, then 1) 2511 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2512 const int RADIX = (1 << LOG2_RADIX); 2513 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2514 while ((mid = lower + step) < upper) { 2515 assert_LU_OK; 2516 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2517 if (mid->pc_offset() < pc_offset) { 2518 lower = mid; 2519 } else { 2520 upper = mid; 2521 break; 2522 } 2523 } 2524 assert_LU_OK; 2525 } 2526 2527 // Sneak up on the value with a linear search of length ~16. 2528 while (true) { 2529 assert_LU_OK; 2530 mid = lower + 1; 2531 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2532 if (mid->pc_offset() < pc_offset) { 2533 lower = mid; 2534 } else { 2535 upper = mid; 2536 break; 2537 } 2538 } 2539 #undef assert_LU_OK 2540 2541 if (match_desc(upper, pc_offset, approximate)) { 2542 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2543 _pc_desc_cache.add_pc_desc(upper); 2544 return upper; 2545 } else { 2546 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2547 return NULL; 2548 } 2549 } 2550 2551 2552 void nmethod::check_all_dependencies(DepChange& changes) { 2553 // Checked dependencies are allocated into this ResourceMark 2554 ResourceMark rm; 2555 2556 // Turn off dependency tracing while actually testing dependencies. 2557 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2558 2559 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2560 &DependencySignature::equals, 11027> DepTable; 2561 2562 DepTable* table = new DepTable(); 2563 2564 // Iterate over live nmethods and check dependencies of all nmethods that are not 2565 // marked for deoptimization. A particular dependency is only checked once. 2566 NMethodIterator iter; 2567 while(iter.next()) { 2568 nmethod* nm = iter.method(); 2569 // Only notify for live nmethods 2570 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2571 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2572 // Construct abstraction of a dependency. 2573 DependencySignature* current_sig = new DependencySignature(deps); 2574 2575 // Determine if dependency is already checked. table->put(...) returns 2576 // 'true' if the dependency is added (i.e., was not in the hashtable). 2577 if (table->put(*current_sig, 1)) { 2578 if (deps.check_dependency() != NULL) { 2579 // Dependency checking failed. Print out information about the failed 2580 // dependency and finally fail with an assert. We can fail here, since 2581 // dependency checking is never done in a product build. 2582 tty->print_cr("Failed dependency:"); 2583 changes.print(); 2584 nm->print(); 2585 nm->print_dependencies(); 2586 assert(false, "Should have been marked for deoptimization"); 2587 } 2588 } 2589 } 2590 } 2591 } 2592 } 2593 2594 bool nmethod::check_dependency_on(DepChange& changes) { 2595 // What has happened: 2596 // 1) a new class dependee has been added 2597 // 2) dependee and all its super classes have been marked 2598 bool found_check = false; // set true if we are upset 2599 for (Dependencies::DepStream deps(this); deps.next(); ) { 2600 // Evaluate only relevant dependencies. 2601 if (deps.spot_check_dependency_at(changes) != NULL) { 2602 found_check = true; 2603 NOT_DEBUG(break); 2604 } 2605 } 2606 return found_check; 2607 } 2608 2609 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2610 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2611 Array<Method*>* dependee_methods = dependee_ik->methods(); 2612 for (Dependencies::DepStream deps(this); deps.next(); ) { 2613 if (deps.type() == Dependencies::evol_method) { 2614 Method* method = deps.method_argument(0); 2615 for (int j = 0; j < dependee_methods->length(); j++) { 2616 if (dependee_methods->at(j) == method) { 2617 // RC_TRACE macro has an embedded ResourceMark 2618 RC_TRACE(0x01000000, 2619 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2620 _method->method_holder()->external_name(), 2621 _method->name()->as_C_string(), 2622 _method->signature()->as_C_string(), compile_id(), 2623 method->method_holder()->external_name(), 2624 method->name()->as_C_string(), 2625 method->signature()->as_C_string())); 2626 if (TraceDependencies || LogCompilation) 2627 deps.log_dependency(dependee); 2628 return true; 2629 } 2630 } 2631 } 2632 } 2633 return false; 2634 } 2635 2636 // Called from mark_for_deoptimization, when dependee is invalidated. 2637 bool nmethod::is_dependent_on_method(Method* dependee) { 2638 for (Dependencies::DepStream deps(this); deps.next(); ) { 2639 if (deps.type() != Dependencies::evol_method) 2640 continue; 2641 Method* method = deps.method_argument(0); 2642 if (method == dependee) return true; 2643 } 2644 return false; 2645 } 2646 2647 2648 bool nmethod::is_patchable_at(address instr_addr) { 2649 assert(insts_contains(instr_addr), "wrong nmethod used"); 2650 if (is_zombie()) { 2651 // a zombie may never be patched 2652 return false; 2653 } 2654 return true; 2655 } 2656 2657 2658 address nmethod::continuation_for_implicit_exception(address pc) { 2659 // Exception happened outside inline-cache check code => we are inside 2660 // an active nmethod => use cpc to determine a return address 2661 int exception_offset = pc - code_begin(); 2662 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2663 #ifdef ASSERT 2664 if (cont_offset == 0) { 2665 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2666 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2667 HandleMark hm(thread); 2668 ResourceMark rm(thread); 2669 CodeBlob* cb = CodeCache::find_blob(pc); 2670 assert(cb != NULL && cb == this, ""); 2671 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2672 print(); 2673 method()->print_codes(); 2674 print_code(); 2675 print_pcs(); 2676 } 2677 #endif 2678 if (cont_offset == 0) { 2679 // Let the normal error handling report the exception 2680 return NULL; 2681 } 2682 return code_begin() + cont_offset; 2683 } 2684 2685 2686 2687 void nmethod_init() { 2688 // make sure you didn't forget to adjust the filler fields 2689 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2690 } 2691 2692 2693 //------------------------------------------------------------------------------------------- 2694 2695 2696 // QQQ might we make this work from a frame?? 2697 nmethodLocker::nmethodLocker(address pc) { 2698 CodeBlob* cb = CodeCache::find_blob(pc); 2699 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2700 _nm = (nmethod*)cb; 2701 lock_nmethod(_nm); 2702 } 2703 2704 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2705 // should pass zombie_ok == true. 2706 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2707 if (nm == NULL) return; 2708 Atomic::inc(&nm->_lock_count); 2709 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2710 } 2711 2712 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2713 if (nm == NULL) return; 2714 Atomic::dec(&nm->_lock_count); 2715 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2716 } 2717 2718 // ----------------------------------------------------------------------------- 2719 // nmethod::get_deopt_original_pc 2720 // 2721 // Return the original PC for the given PC if: 2722 // (a) the given PC belongs to a nmethod and 2723 // (b) it is a deopt PC 2724 address nmethod::get_deopt_original_pc(const frame* fr) { 2725 if (fr->cb() == NULL) return NULL; 2726 2727 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2728 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2729 return nm->get_original_pc(fr); 2730 2731 return NULL; 2732 } 2733 2734 2735 // ----------------------------------------------------------------------------- 2736 // MethodHandle 2737 2738 bool nmethod::is_method_handle_return(address return_pc) { 2739 if (!has_method_handle_invokes()) return false; 2740 PcDesc* pd = pc_desc_at(return_pc); 2741 if (pd == NULL) 2742 return false; 2743 return pd->is_method_handle_invoke(); 2744 } 2745 2746 2747 // ----------------------------------------------------------------------------- 2748 // Verification 2749 2750 class VerifyOopsClosure: public OopClosure { 2751 nmethod* _nm; 2752 bool _ok; 2753 public: 2754 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2755 bool ok() { return _ok; } 2756 virtual void do_oop(oop* p) { 2757 if ((*p) == NULL || (*p)->is_oop()) return; 2758 if (_ok) { 2759 _nm->print_nmethod(true); 2760 _ok = false; 2761 } 2762 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2763 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2764 } 2765 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2766 }; 2767 2768 void nmethod::verify() { 2769 2770 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2771 // seems odd. 2772 2773 if (is_zombie() || is_not_entrant() || is_unloaded()) 2774 return; 2775 2776 // Make sure all the entry points are correctly aligned for patching. 2777 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2778 2779 // assert(method()->is_oop(), "must be valid"); 2780 2781 ResourceMark rm; 2782 2783 if (!CodeCache::contains(this)) { 2784 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2785 } 2786 2787 if(is_native_method() ) 2788 return; 2789 2790 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2791 if (nm != this) { 2792 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2793 } 2794 2795 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2796 if (! p->verify(this)) { 2797 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2798 } 2799 } 2800 2801 VerifyOopsClosure voc(this); 2802 oops_do(&voc); 2803 assert(voc.ok(), "embedded oops must be OK"); 2804 verify_scavenge_root_oops(); 2805 2806 verify_scopes(); 2807 } 2808 2809 2810 void nmethod::verify_interrupt_point(address call_site) { 2811 // Verify IC only when nmethod installation is finished. 2812 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2813 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2814 if (is_installed) { 2815 Thread *cur = Thread::current(); 2816 if (CompiledIC_lock->owner() == cur || 2817 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2818 SafepointSynchronize::is_at_safepoint())) { 2819 CompiledIC_at(this, call_site); 2820 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2821 } else { 2822 MutexLocker ml_verify (CompiledIC_lock); 2823 CompiledIC_at(this, call_site); 2824 } 2825 } 2826 2827 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2828 assert(pd != NULL, "PcDesc must exist"); 2829 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2830 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2831 pd->return_oop()); 2832 !sd->is_top(); sd = sd->sender()) { 2833 sd->verify(); 2834 } 2835 } 2836 2837 void nmethod::verify_scopes() { 2838 if( !method() ) return; // Runtime stubs have no scope 2839 if (method()->is_native()) return; // Ignore stub methods. 2840 // iterate through all interrupt point 2841 // and verify the debug information is valid. 2842 RelocIterator iter((nmethod*)this); 2843 while (iter.next()) { 2844 address stub = NULL; 2845 switch (iter.type()) { 2846 case relocInfo::virtual_call_type: 2847 verify_interrupt_point(iter.addr()); 2848 break; 2849 case relocInfo::opt_virtual_call_type: 2850 stub = iter.opt_virtual_call_reloc()->static_stub(); 2851 verify_interrupt_point(iter.addr()); 2852 break; 2853 case relocInfo::static_call_type: 2854 stub = iter.static_call_reloc()->static_stub(); 2855 //verify_interrupt_point(iter.addr()); 2856 break; 2857 case relocInfo::runtime_call_type: 2858 address destination = iter.reloc()->value(); 2859 // Right now there is no way to find out which entries support 2860 // an interrupt point. It would be nice if we had this 2861 // information in a table. 2862 break; 2863 } 2864 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2865 } 2866 } 2867 2868 2869 // ----------------------------------------------------------------------------- 2870 // Non-product code 2871 #ifndef PRODUCT 2872 2873 class DebugScavengeRoot: public OopClosure { 2874 nmethod* _nm; 2875 bool _ok; 2876 public: 2877 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2878 bool ok() { return _ok; } 2879 virtual void do_oop(oop* p) { 2880 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2881 if (_ok) { 2882 _nm->print_nmethod(true); 2883 _ok = false; 2884 } 2885 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2886 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2887 (*p)->print(); 2888 } 2889 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2890 }; 2891 2892 void nmethod::verify_scavenge_root_oops() { 2893 if (UseG1GC) { 2894 return; 2895 } 2896 2897 if (!on_scavenge_root_list()) { 2898 // Actually look inside, to verify the claim that it's clean. 2899 DebugScavengeRoot debug_scavenge_root(this); 2900 oops_do(&debug_scavenge_root); 2901 if (!debug_scavenge_root.ok()) 2902 fatal("found an unadvertised bad scavengable oop in the code cache"); 2903 } 2904 assert(scavenge_root_not_marked(), ""); 2905 } 2906 2907 #endif // PRODUCT 2908 2909 // Printing operations 2910 2911 void nmethod::print() const { 2912 ResourceMark rm; 2913 ttyLocker ttyl; // keep the following output all in one block 2914 2915 tty->print("Compiled method "); 2916 2917 if (is_compiled_by_c1()) { 2918 tty->print("(c1) "); 2919 } else if (is_compiled_by_c2()) { 2920 tty->print("(c2) "); 2921 } else if (is_compiled_by_shark()) { 2922 tty->print("(shark) "); 2923 } else if (is_compiled_by_jvmci()) { 2924 tty->print("(JVMCI) "); 2925 } else { 2926 tty->print("(nm) "); 2927 } 2928 2929 print_on(tty, NULL); 2930 2931 if (WizardMode) { 2932 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2933 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2934 tty->print(" { "); 2935 if (is_in_use()) tty->print("in_use "); 2936 if (is_not_entrant()) tty->print("not_entrant "); 2937 if (is_zombie()) tty->print("zombie "); 2938 if (is_unloaded()) tty->print("unloaded "); 2939 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2940 tty->print_cr("}:"); 2941 } 2942 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2943 p2i(this), 2944 p2i(this) + size(), 2945 size()); 2946 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2947 p2i(relocation_begin()), 2948 p2i(relocation_end()), 2949 relocation_size()); 2950 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2951 p2i(consts_begin()), 2952 p2i(consts_end()), 2953 consts_size()); 2954 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2955 p2i(insts_begin()), 2956 p2i(insts_end()), 2957 insts_size()); 2958 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2959 p2i(stub_begin()), 2960 p2i(stub_end()), 2961 stub_size()); 2962 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2963 p2i(oops_begin()), 2964 p2i(oops_end()), 2965 oops_size()); 2966 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2967 p2i(metadata_begin()), 2968 p2i(metadata_end()), 2969 metadata_size()); 2970 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2971 p2i(scopes_data_begin()), 2972 p2i(scopes_data_end()), 2973 scopes_data_size()); 2974 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2975 p2i(scopes_pcs_begin()), 2976 p2i(scopes_pcs_end()), 2977 scopes_pcs_size()); 2978 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2979 p2i(dependencies_begin()), 2980 p2i(dependencies_end()), 2981 dependencies_size()); 2982 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2983 p2i(handler_table_begin()), 2984 p2i(handler_table_end()), 2985 handler_table_size()); 2986 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2987 p2i(nul_chk_table_begin()), 2988 p2i(nul_chk_table_end()), 2989 nul_chk_table_size()); 2990 } 2991 2992 void nmethod::print_code() { 2993 HandleMark hm; 2994 ResourceMark m; 2995 Disassembler::decode(this); 2996 } 2997 2998 2999 #ifndef PRODUCT 3000 3001 void nmethod::print_scopes() { 3002 // Find the first pc desc for all scopes in the code and print it. 3003 ResourceMark rm; 3004 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3005 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 3006 continue; 3007 3008 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 3009 while (sd != NULL) { 3010 sd->print_on(tty, p); 3011 sd = sd->sender(); 3012 } 3013 } 3014 } 3015 3016 void nmethod::print_dependencies() { 3017 ResourceMark rm; 3018 ttyLocker ttyl; // keep the following output all in one block 3019 tty->print_cr("Dependencies:"); 3020 for (Dependencies::DepStream deps(this); deps.next(); ) { 3021 deps.print_dependency(); 3022 Klass* ctxk = deps.context_type(); 3023 if (ctxk != NULL) { 3024 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 3025 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 3026 } 3027 } 3028 deps.log_dependency(); // put it into the xml log also 3029 } 3030 } 3031 3032 3033 void nmethod::print_relocations() { 3034 ResourceMark m; // in case methods get printed via the debugger 3035 tty->print_cr("relocations:"); 3036 RelocIterator iter(this); 3037 iter.print(); 3038 if (UseRelocIndex) { 3039 jint* index_end = (jint*)relocation_end() - 1; 3040 jint index_size = *index_end; 3041 jint* index_start = (jint*)( (address)index_end - index_size ); 3042 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 3043 if (index_size > 0) { 3044 jint* ip; 3045 for (ip = index_start; ip+2 <= index_end; ip += 2) 3046 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 3047 ip[0], 3048 ip[1], 3049 p2i(header_end()+ip[0]), 3050 p2i(relocation_begin()-1+ip[1])); 3051 for (; ip < index_end; ip++) 3052 tty->print_cr(" (%d ?)", ip[0]); 3053 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 3054 ip++; 3055 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 3056 } 3057 } 3058 } 3059 3060 3061 void nmethod::print_pcs() { 3062 ResourceMark m; // in case methods get printed via debugger 3063 tty->print_cr("pc-bytecode offsets:"); 3064 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3065 p->print(this); 3066 } 3067 } 3068 3069 #endif // PRODUCT 3070 3071 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3072 RelocIterator iter(this, begin, end); 3073 bool have_one = false; 3074 while (iter.next()) { 3075 have_one = true; 3076 switch (iter.type()) { 3077 case relocInfo::none: return "no_reloc"; 3078 case relocInfo::oop_type: { 3079 stringStream st; 3080 oop_Relocation* r = iter.oop_reloc(); 3081 oop obj = r->oop_value(); 3082 st.print("oop("); 3083 if (obj == NULL) st.print("NULL"); 3084 else obj->print_value_on(&st); 3085 st.print(")"); 3086 return st.as_string(); 3087 } 3088 case relocInfo::metadata_type: { 3089 stringStream st; 3090 metadata_Relocation* r = iter.metadata_reloc(); 3091 Metadata* obj = r->metadata_value(); 3092 st.print("metadata("); 3093 if (obj == NULL) st.print("NULL"); 3094 else obj->print_value_on(&st); 3095 st.print(")"); 3096 return st.as_string(); 3097 } 3098 case relocInfo::runtime_call_type: { 3099 stringStream st; 3100 st.print("runtime_call"); 3101 runtime_call_Relocation* r = iter.runtime_call_reloc(); 3102 address dest = r->destination(); 3103 CodeBlob* cb = CodeCache::find_blob(dest); 3104 if (cb != NULL) { 3105 st.print(" %s", cb->name()); 3106 } 3107 return st.as_string(); 3108 } 3109 case relocInfo::virtual_call_type: return "virtual_call"; 3110 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 3111 case relocInfo::static_call_type: return "static_call"; 3112 case relocInfo::static_stub_type: return "static_stub"; 3113 case relocInfo::external_word_type: return "external_word"; 3114 case relocInfo::internal_word_type: return "internal_word"; 3115 case relocInfo::section_word_type: return "section_word"; 3116 case relocInfo::poll_type: return "poll"; 3117 case relocInfo::poll_return_type: return "poll_return"; 3118 case relocInfo::type_mask: return "type_bit_mask"; 3119 } 3120 } 3121 return have_one ? "other" : NULL; 3122 } 3123 3124 // Return a the last scope in (begin..end] 3125 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3126 PcDesc* p = pc_desc_near(begin+1); 3127 if (p != NULL && p->real_pc(this) <= end) { 3128 return new ScopeDesc(this, p->scope_decode_offset(), 3129 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3130 p->return_oop()); 3131 } 3132 return NULL; 3133 } 3134 3135 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3136 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3137 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3138 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3139 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3140 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3141 3142 if (has_method_handle_invokes()) 3143 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3144 3145 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3146 3147 if (block_begin == entry_point()) { 3148 methodHandle m = method(); 3149 if (m.not_null()) { 3150 stream->print(" # "); 3151 m->print_value_on(stream); 3152 stream->cr(); 3153 } 3154 if (m.not_null() && !is_osr_method()) { 3155 ResourceMark rm; 3156 int sizeargs = m->size_of_parameters(); 3157 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3158 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3159 { 3160 int sig_index = 0; 3161 if (!m->is_static()) 3162 sig_bt[sig_index++] = T_OBJECT; // 'this' 3163 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3164 BasicType t = ss.type(); 3165 sig_bt[sig_index++] = t; 3166 if (type2size[t] == 2) { 3167 sig_bt[sig_index++] = T_VOID; 3168 } else { 3169 assert(type2size[t] == 1, "size is 1 or 2"); 3170 } 3171 } 3172 assert(sig_index == sizeargs, ""); 3173 } 3174 const char* spname = "sp"; // make arch-specific? 3175 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3176 int stack_slot_offset = this->frame_size() * wordSize; 3177 int tab1 = 14, tab2 = 24; 3178 int sig_index = 0; 3179 int arg_index = (m->is_static() ? 0 : -1); 3180 bool did_old_sp = false; 3181 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3182 bool at_this = (arg_index == -1); 3183 bool at_old_sp = false; 3184 BasicType t = (at_this ? T_OBJECT : ss.type()); 3185 assert(t == sig_bt[sig_index], "sigs in sync"); 3186 if (at_this) 3187 stream->print(" # this: "); 3188 else 3189 stream->print(" # parm%d: ", arg_index); 3190 stream->move_to(tab1); 3191 VMReg fst = regs[sig_index].first(); 3192 VMReg snd = regs[sig_index].second(); 3193 if (fst->is_reg()) { 3194 stream->print("%s", fst->name()); 3195 if (snd->is_valid()) { 3196 stream->print(":%s", snd->name()); 3197 } 3198 } else if (fst->is_stack()) { 3199 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3200 if (offset == stack_slot_offset) at_old_sp = true; 3201 stream->print("[%s+0x%x]", spname, offset); 3202 } else { 3203 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3204 } 3205 stream->print(" "); 3206 stream->move_to(tab2); 3207 stream->print("= "); 3208 if (at_this) { 3209 m->method_holder()->print_value_on(stream); 3210 } else { 3211 bool did_name = false; 3212 if (!at_this && ss.is_object()) { 3213 Symbol* name = ss.as_symbol_or_null(); 3214 if (name != NULL) { 3215 name->print_value_on(stream); 3216 did_name = true; 3217 } 3218 } 3219 if (!did_name) 3220 stream->print("%s", type2name(t)); 3221 } 3222 if (at_old_sp) { 3223 stream->print(" (%s of caller)", spname); 3224 did_old_sp = true; 3225 } 3226 stream->cr(); 3227 sig_index += type2size[t]; 3228 arg_index += 1; 3229 if (!at_this) ss.next(); 3230 } 3231 if (!did_old_sp) { 3232 stream->print(" # "); 3233 stream->move_to(tab1); 3234 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3235 stream->print(" (%s of caller)", spname); 3236 stream->cr(); 3237 } 3238 } 3239 } 3240 } 3241 3242 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3243 // First, find an oopmap in (begin, end]. 3244 // We use the odd half-closed interval so that oop maps and scope descs 3245 // which are tied to the byte after a call are printed with the call itself. 3246 address base = code_begin(); 3247 ImmutableOopMapSet* oms = oop_maps(); 3248 if (oms != NULL) { 3249 for (int i = 0, imax = oms->count(); i < imax; i++) { 3250 const ImmutableOopMapPair* pair = oms->pair_at(i); 3251 const ImmutableOopMap* om = pair->get_from(oms); 3252 address pc = base + pair->pc_offset(); 3253 if (pc > begin) { 3254 if (pc <= end) { 3255 st->move_to(column); 3256 st->print("; "); 3257 om->print_on(st); 3258 } 3259 break; 3260 } 3261 } 3262 } 3263 3264 // Print any debug info present at this pc. 3265 ScopeDesc* sd = scope_desc_in(begin, end); 3266 if (sd != NULL) { 3267 st->move_to(column); 3268 if (sd->bci() == SynchronizationEntryBCI) { 3269 st->print(";*synchronization entry"); 3270 } else { 3271 if (sd->method() == NULL) { 3272 st->print("method is NULL"); 3273 } else if (sd->method()->is_native()) { 3274 st->print("method is native"); 3275 } else { 3276 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3277 st->print(";*%s", Bytecodes::name(bc)); 3278 switch (bc) { 3279 case Bytecodes::_invokevirtual: 3280 case Bytecodes::_invokespecial: 3281 case Bytecodes::_invokestatic: 3282 case Bytecodes::_invokeinterface: 3283 { 3284 Bytecode_invoke invoke(sd->method(), sd->bci()); 3285 st->print(" "); 3286 if (invoke.name() != NULL) 3287 invoke.name()->print_symbol_on(st); 3288 else 3289 st->print("<UNKNOWN>"); 3290 break; 3291 } 3292 case Bytecodes::_getfield: 3293 case Bytecodes::_putfield: 3294 case Bytecodes::_getstatic: 3295 case Bytecodes::_putstatic: 3296 { 3297 Bytecode_field field(sd->method(), sd->bci()); 3298 st->print(" "); 3299 if (field.name() != NULL) 3300 field.name()->print_symbol_on(st); 3301 else 3302 st->print("<UNKNOWN>"); 3303 } 3304 } 3305 } 3306 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3307 } 3308 3309 // Print all scopes 3310 for (;sd != NULL; sd = sd->sender()) { 3311 st->move_to(column); 3312 st->print("; -"); 3313 if (sd->method() == NULL) { 3314 st->print("method is NULL"); 3315 } else { 3316 sd->method()->print_short_name(st); 3317 } 3318 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3319 if (lineno != -1) { 3320 st->print("@%d (line %d)", sd->bci(), lineno); 3321 } else { 3322 st->print("@%d", sd->bci()); 3323 } 3324 st->cr(); 3325 } 3326 } 3327 3328 // Print relocation information 3329 const char* str = reloc_string_for(begin, end); 3330 if (str != NULL) { 3331 if (sd != NULL) st->cr(); 3332 st->move_to(column); 3333 st->print("; {%s}", str); 3334 } 3335 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3336 if (cont_offset != 0) { 3337 st->move_to(column); 3338 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3339 } 3340 3341 } 3342 3343 #ifndef PRODUCT 3344 3345 void nmethod::print_value_on(outputStream* st) const { 3346 st->print("nmethod"); 3347 print_on(st, NULL); 3348 } 3349 3350 void nmethod::print_calls(outputStream* st) { 3351 RelocIterator iter(this); 3352 while (iter.next()) { 3353 switch (iter.type()) { 3354 case relocInfo::virtual_call_type: 3355 case relocInfo::opt_virtual_call_type: { 3356 VerifyMutexLocker mc(CompiledIC_lock); 3357 CompiledIC_at(&iter)->print(); 3358 break; 3359 } 3360 case relocInfo::static_call_type: 3361 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3362 compiledStaticCall_at(iter.reloc())->print(); 3363 break; 3364 } 3365 } 3366 } 3367 3368 void nmethod::print_handler_table() { 3369 ExceptionHandlerTable(this).print(); 3370 } 3371 3372 void nmethod::print_nul_chk_table() { 3373 ImplicitExceptionTable(this).print(code_begin()); 3374 } 3375 3376 void nmethod::print_statistics() { 3377 ttyLocker ttyl; 3378 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3379 native_nmethod_stats.print_native_nmethod_stats(); 3380 #ifdef COMPILER1 3381 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3382 #endif 3383 #ifdef COMPILER2 3384 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3385 #endif 3386 #if INCLUDE_JVMCI 3387 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3388 #endif 3389 #ifdef SHARK 3390 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 3391 #endif 3392 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3393 DebugInformationRecorder::print_statistics(); 3394 #ifndef PRODUCT 3395 pc_nmethod_stats.print_pc_stats(); 3396 #endif 3397 Dependencies::print_statistics(); 3398 if (xtty != NULL) xtty->tail("statistics"); 3399 } 3400 3401 #endif // !PRODUCT 3402 3403 #if INCLUDE_JVMCI 3404 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 3405 if (!this->is_compiled_by_jvmci()) { 3406 return NULL; 3407 } 3408 oop installedCode = this->jvmci_installed_code(); 3409 if (installedCode != NULL) { 3410 oop installedCodeName = NULL; 3411 if (installedCode->is_a(InstalledCode::klass())) { 3412 installedCodeName = InstalledCode::name(installedCode); 3413 } 3414 if (installedCodeName != NULL) { 3415 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3416 } else { 3417 jio_snprintf(buf, buflen, "null"); 3418 return buf; 3419 } 3420 } 3421 jio_snprintf(buf, buflen, "noInstalledCode"); 3422 return buf; 3423 } 3424 #endif