1 /* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nmethod.hpp" 30 #include "code/scopeDesc.hpp" 31 #include "compiler/abstractCompiler.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/compileLog.hpp" 34 #include "compiler/compilerOracle.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/bytecode.hpp" 37 #include "oops/methodDataOop.hpp" 38 #include "prims/jvmtiRedefineClassesTrace.hpp" 39 #include "prims/jvmtiImpl.hpp" 40 #include "runtime/sharedRuntime.hpp" 41 #include "runtime/sweeper.hpp" 42 #include "utilities/dtrace.hpp" 43 #include "utilities/events.hpp" 44 #include "utilities/xmlstream.hpp" 45 #ifdef SHARK 46 #include "shark/sharkCompiler.hpp" 47 #endif 48 49 #ifdef DTRACE_ENABLED 50 51 // Only bother with this argument setup if dtrace is available 52 53 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, 54 const char*, int, const char*, int, const char*, int, void*, size_t); 55 56 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, 57 char*, int, char*, int, char*, int); 58 59 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 60 { \ 61 methodOop m = (method); \ 62 if (m != NULL) { \ 63 Symbol* klass_name = m->klass_name(); \ 64 Symbol* name = m->name(); \ 65 Symbol* signature = m->signature(); \ 66 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ 67 klass_name->bytes(), klass_name->utf8_length(), \ 68 name->bytes(), name->utf8_length(), \ 69 signature->bytes(), signature->utf8_length()); \ 70 } \ 71 } 72 73 #else // ndef DTRACE_ENABLED 74 75 #define DTRACE_METHOD_UNLOAD_PROBE(method) 76 77 #endif 78 79 bool nmethod::is_compiled_by_c1() const { 80 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 81 if (is_native_method()) return false; 82 return compiler()->is_c1(); 83 } 84 bool nmethod::is_compiled_by_c2() const { 85 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 86 if (is_native_method()) return false; 87 return compiler()->is_c2(); 88 } 89 bool nmethod::is_compiled_by_shark() const { 90 if (is_native_method()) return false; 91 assert(compiler() != NULL, "must be"); 92 return compiler()->is_shark(); 93 } 94 95 96 97 //--------------------------------------------------------------------------------- 98 // NMethod statistics 99 // They are printed under various flags, including: 100 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 101 // (In the latter two cases, they like other stats are printed to the log only.) 102 103 #ifndef PRODUCT 104 // These variables are put into one block to reduce relocations 105 // and make it simpler to print from the debugger. 106 static 107 struct nmethod_stats_struct { 108 int nmethod_count; 109 int total_size; 110 int relocation_size; 111 int consts_size; 112 int insts_size; 113 int stub_size; 114 int scopes_data_size; 115 int scopes_pcs_size; 116 int dependencies_size; 117 int handler_table_size; 118 int nul_chk_table_size; 119 int oops_size; 120 121 void note_nmethod(nmethod* nm) { 122 nmethod_count += 1; 123 total_size += nm->size(); 124 relocation_size += nm->relocation_size(); 125 consts_size += nm->consts_size(); 126 insts_size += nm->insts_size(); 127 stub_size += nm->stub_size(); 128 oops_size += nm->oops_size(); 129 scopes_data_size += nm->scopes_data_size(); 130 scopes_pcs_size += nm->scopes_pcs_size(); 131 dependencies_size += nm->dependencies_size(); 132 handler_table_size += nm->handler_table_size(); 133 nul_chk_table_size += nm->nul_chk_table_size(); 134 } 135 void print_nmethod_stats() { 136 if (nmethod_count == 0) return; 137 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 138 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 139 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 140 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 141 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 142 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 143 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 144 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 145 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 146 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 147 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 148 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 149 } 150 151 int native_nmethod_count; 152 int native_total_size; 153 int native_relocation_size; 154 int native_insts_size; 155 int native_oops_size; 156 void note_native_nmethod(nmethod* nm) { 157 native_nmethod_count += 1; 158 native_total_size += nm->size(); 159 native_relocation_size += nm->relocation_size(); 160 native_insts_size += nm->insts_size(); 161 native_oops_size += nm->oops_size(); 162 } 163 void print_native_nmethod_stats() { 164 if (native_nmethod_count == 0) return; 165 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 166 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 167 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 168 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 169 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 170 } 171 172 int pc_desc_resets; // number of resets (= number of caches) 173 int pc_desc_queries; // queries to nmethod::find_pc_desc 174 int pc_desc_approx; // number of those which have approximate true 175 int pc_desc_repeats; // number of _pc_descs[0] hits 176 int pc_desc_hits; // number of LRU cache hits 177 int pc_desc_tests; // total number of PcDesc examinations 178 int pc_desc_searches; // total number of quasi-binary search steps 179 int pc_desc_adds; // number of LUR cache insertions 180 181 void print_pc_stats() { 182 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 183 pc_desc_queries, 184 (double)(pc_desc_tests + pc_desc_searches) 185 / pc_desc_queries); 186 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 187 pc_desc_resets, 188 pc_desc_queries, pc_desc_approx, 189 pc_desc_repeats, pc_desc_hits, 190 pc_desc_tests, pc_desc_searches, pc_desc_adds); 191 } 192 } nmethod_stats; 193 #endif //PRODUCT 194 195 196 //--------------------------------------------------------------------------------- 197 198 199 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 200 assert(pc != NULL, "Must be non null"); 201 assert(exception.not_null(), "Must be non null"); 202 assert(handler != NULL, "Must be non null"); 203 204 _count = 0; 205 _exception_type = exception->klass(); 206 _next = NULL; 207 208 add_address_and_handler(pc,handler); 209 } 210 211 212 address ExceptionCache::match(Handle exception, address pc) { 213 assert(pc != NULL,"Must be non null"); 214 assert(exception.not_null(),"Must be non null"); 215 if (exception->klass() == exception_type()) { 216 return (test_address(pc)); 217 } 218 219 return NULL; 220 } 221 222 223 bool ExceptionCache::match_exception_with_space(Handle exception) { 224 assert(exception.not_null(),"Must be non null"); 225 if (exception->klass() == exception_type() && count() < cache_size) { 226 return true; 227 } 228 return false; 229 } 230 231 232 address ExceptionCache::test_address(address addr) { 233 for (int i=0; i<count(); i++) { 234 if (pc_at(i) == addr) { 235 return handler_at(i); 236 } 237 } 238 return NULL; 239 } 240 241 242 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 243 if (test_address(addr) == handler) return true; 244 if (count() < cache_size) { 245 set_pc_at(count(),addr); 246 set_handler_at(count(), handler); 247 increment_count(); 248 return true; 249 } 250 return false; 251 } 252 253 254 // private method for handling exception cache 255 // These methods are private, and used to manipulate the exception cache 256 // directly. 257 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 258 ExceptionCache* ec = exception_cache(); 259 while (ec != NULL) { 260 if (ec->match_exception_with_space(exception)) { 261 return ec; 262 } 263 ec = ec->next(); 264 } 265 return NULL; 266 } 267 268 269 //----------------------------------------------------------------------------- 270 271 272 // Helper used by both find_pc_desc methods. 273 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 274 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 275 if (!approximate) 276 return pc->pc_offset() == pc_offset; 277 else 278 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 279 } 280 281 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 282 if (initial_pc_desc == NULL) { 283 _pc_descs[0] = NULL; // native method; no PcDescs at all 284 return; 285 } 286 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 287 // reset the cache by filling it with benign (non-null) values 288 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 289 for (int i = 0; i < cache_size; i++) 290 _pc_descs[i] = initial_pc_desc; 291 } 292 293 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 294 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 295 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 296 297 // Note: one might think that caching the most recently 298 // read value separately would be a win, but one would be 299 // wrong. When many threads are updating it, the cache 300 // line it's in would bounce between caches, negating 301 // any benefit. 302 303 // In order to prevent race conditions do not load cache elements 304 // repeatedly, but use a local copy: 305 PcDesc* res; 306 307 // Step one: Check the most recently added value. 308 res = _pc_descs[0]; 309 if (res == NULL) return NULL; // native method; no PcDescs at all 310 if (match_desc(res, pc_offset, approximate)) { 311 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 312 return res; 313 } 314 315 // Step two: Check the rest of the LRU cache. 316 for (int i = 1; i < cache_size; ++i) { 317 res = _pc_descs[i]; 318 if (res->pc_offset() < 0) break; // optimization: skip empty cache 319 if (match_desc(res, pc_offset, approximate)) { 320 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 321 return res; 322 } 323 } 324 325 // Report failure. 326 return NULL; 327 } 328 329 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 330 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 331 // Update the LRU cache by shifting pc_desc forward. 332 for (int i = 0; i < cache_size; i++) { 333 PcDesc* next = _pc_descs[i]; 334 _pc_descs[i] = pc_desc; 335 pc_desc = next; 336 } 337 } 338 339 // adjust pcs_size so that it is a multiple of both oopSize and 340 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 341 // of oopSize, then 2*sizeof(PcDesc) is) 342 static int adjust_pcs_size(int pcs_size) { 343 int nsize = round_to(pcs_size, oopSize); 344 if ((nsize % sizeof(PcDesc)) != 0) { 345 nsize = pcs_size + sizeof(PcDesc); 346 } 347 assert((nsize % oopSize) == 0, "correct alignment"); 348 return nsize; 349 } 350 351 //----------------------------------------------------------------------------- 352 353 354 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 355 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 356 assert(new_entry != NULL,"Must be non null"); 357 assert(new_entry->next() == NULL, "Must be null"); 358 359 if (exception_cache() != NULL) { 360 new_entry->set_next(exception_cache()); 361 } 362 set_exception_cache(new_entry); 363 } 364 365 void nmethod::remove_from_exception_cache(ExceptionCache* ec) { 366 ExceptionCache* prev = NULL; 367 ExceptionCache* curr = exception_cache(); 368 assert(curr != NULL, "nothing to remove"); 369 // find the previous and next entry of ec 370 while (curr != ec) { 371 prev = curr; 372 curr = curr->next(); 373 assert(curr != NULL, "ExceptionCache not found"); 374 } 375 // now: curr == ec 376 ExceptionCache* next = curr->next(); 377 if (prev == NULL) { 378 set_exception_cache(next); 379 } else { 380 prev->set_next(next); 381 } 382 delete curr; 383 } 384 385 386 // public method for accessing the exception cache 387 // These are the public access methods. 388 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 389 // We never grab a lock to read the exception cache, so we may 390 // have false negatives. This is okay, as it can only happen during 391 // the first few exception lookups for a given nmethod. 392 ExceptionCache* ec = exception_cache(); 393 while (ec != NULL) { 394 address ret_val; 395 if ((ret_val = ec->match(exception,pc)) != NULL) { 396 return ret_val; 397 } 398 ec = ec->next(); 399 } 400 return NULL; 401 } 402 403 404 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 405 // There are potential race conditions during exception cache updates, so we 406 // must own the ExceptionCache_lock before doing ANY modifications. Because 407 // we don't lock during reads, it is possible to have several threads attempt 408 // to update the cache with the same data. We need to check for already inserted 409 // copies of the current data before adding it. 410 411 MutexLocker ml(ExceptionCache_lock); 412 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 413 414 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 415 target_entry = new ExceptionCache(exception,pc,handler); 416 add_exception_cache_entry(target_entry); 417 } 418 } 419 420 421 //-------------end of code for ExceptionCache-------------- 422 423 424 int nmethod::total_size() const { 425 return 426 consts_size() + 427 insts_size() + 428 stub_size() + 429 scopes_data_size() + 430 scopes_pcs_size() + 431 handler_table_size() + 432 nul_chk_table_size(); 433 } 434 435 const char* nmethod::compile_kind() const { 436 if (is_osr_method()) return "osr"; 437 if (method() != NULL && is_native_method()) return "c2n"; 438 return NULL; 439 } 440 441 // Fill in default values for various flag fields 442 void nmethod::init_defaults() { 443 _state = alive; 444 _marked_for_reclamation = 0; 445 _has_flushed_dependencies = 0; 446 _speculatively_disconnected = 0; 447 _has_unsafe_access = 0; 448 _has_method_handle_invokes = 0; 449 _marked_for_deoptimization = 0; 450 _lock_count = 0; 451 _stack_traversal_mark = 0; 452 _unload_reported = false; // jvmti state 453 454 NOT_PRODUCT(_has_debug_info = false); 455 #ifdef ASSERT 456 _oops_are_stale = false; 457 #endif 458 459 _oops_do_mark_link = NULL; 460 _jmethod_id = NULL; 461 _osr_link = NULL; 462 _scavenge_root_link = NULL; 463 _scavenge_root_state = 0; 464 _saved_nmethod_link = NULL; 465 _compiler = NULL; 466 467 #ifdef HAVE_DTRACE_H 468 _trap_offset = 0; 469 #endif // def HAVE_DTRACE_H 470 } 471 472 473 nmethod* nmethod::new_native_nmethod(methodHandle method, 474 int compile_id, 475 CodeBuffer *code_buffer, 476 int vep_offset, 477 int frame_complete, 478 int frame_size, 479 ByteSize basic_lock_owner_sp_offset, 480 ByteSize basic_lock_sp_offset, 481 OopMapSet* oop_maps) { 482 // create nmethod 483 nmethod* nm = NULL; 484 { 485 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 486 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 487 CodeOffsets offsets; 488 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 489 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 490 nm = new (native_nmethod_size) 491 nmethod(method(), native_nmethod_size, compile_id, &offsets, 492 code_buffer, frame_size, 493 basic_lock_owner_sp_offset, basic_lock_sp_offset, 494 oop_maps); 495 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 496 if (PrintAssembly && nm != NULL) 497 Disassembler::decode(nm); 498 } 499 // verify nmethod 500 debug_only(if (nm) nm->verify();) // might block 501 502 if (nm != NULL) { 503 nm->log_new_nmethod(); 504 } 505 506 return nm; 507 } 508 509 #ifdef HAVE_DTRACE_H 510 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 511 CodeBuffer *code_buffer, 512 int vep_offset, 513 int trap_offset, 514 int frame_complete, 515 int frame_size) { 516 // create nmethod 517 nmethod* nm = NULL; 518 { 519 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 520 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 521 CodeOffsets offsets; 522 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 523 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 524 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 525 526 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); 527 528 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 529 if (PrintAssembly && nm != NULL) 530 Disassembler::decode(nm); 531 } 532 // verify nmethod 533 debug_only(if (nm) nm->verify();) // might block 534 535 if (nm != NULL) { 536 nm->log_new_nmethod(); 537 } 538 539 return nm; 540 } 541 542 #endif // def HAVE_DTRACE_H 543 544 nmethod* nmethod::new_nmethod(methodHandle method, 545 int compile_id, 546 int entry_bci, 547 CodeOffsets* offsets, 548 int orig_pc_offset, 549 DebugInformationRecorder* debug_info, 550 Dependencies* dependencies, 551 CodeBuffer* code_buffer, int frame_size, 552 OopMapSet* oop_maps, 553 ExceptionHandlerTable* handler_table, 554 ImplicitExceptionTable* nul_chk_table, 555 AbstractCompiler* compiler, 556 int comp_level 557 ) 558 { 559 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 560 // create nmethod 561 nmethod* nm = NULL; 562 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 563 int nmethod_size = 564 allocation_size(code_buffer, sizeof(nmethod)) 565 + adjust_pcs_size(debug_info->pcs_size()) 566 + round_to(dependencies->size_in_bytes() , oopSize) 567 + round_to(handler_table->size_in_bytes(), oopSize) 568 + round_to(nul_chk_table->size_in_bytes(), oopSize) 569 + round_to(debug_info->data_size() , oopSize); 570 nm = new (nmethod_size) 571 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 572 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 573 oop_maps, 574 handler_table, 575 nul_chk_table, 576 compiler, 577 comp_level); 578 if (nm != NULL) { 579 // To make dependency checking during class loading fast, record 580 // the nmethod dependencies in the classes it is dependent on. 581 // This allows the dependency checking code to simply walk the 582 // class hierarchy above the loaded class, checking only nmethods 583 // which are dependent on those classes. The slow way is to 584 // check every nmethod for dependencies which makes it linear in 585 // the number of methods compiled. For applications with a lot 586 // classes the slow way is too slow. 587 for (Dependencies::DepStream deps(nm); deps.next(); ) { 588 klassOop klass = deps.context_type(); 589 if (klass == NULL) continue; // ignore things like evol_method 590 591 // record this nmethod as dependent on this klass 592 instanceKlass::cast(klass)->add_dependent_nmethod(nm); 593 } 594 } 595 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 596 if (PrintAssembly && nm != NULL) 597 Disassembler::decode(nm); 598 } 599 600 // verify nmethod 601 debug_only(if (nm) nm->verify();) // might block 602 603 if (nm != NULL) { 604 nm->log_new_nmethod(); 605 } 606 607 // done 608 return nm; 609 } 610 611 612 // For native wrappers 613 nmethod::nmethod( 614 methodOop method, 615 int nmethod_size, 616 int compile_id, 617 CodeOffsets* offsets, 618 CodeBuffer* code_buffer, 619 int frame_size, 620 ByteSize basic_lock_owner_sp_offset, 621 ByteSize basic_lock_sp_offset, 622 OopMapSet* oop_maps ) 623 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 624 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 625 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 626 _native_basic_lock_sp_offset(basic_lock_sp_offset) 627 { 628 { 629 debug_only(No_Safepoint_Verifier nsv;) 630 assert_locked_or_safepoint(CodeCache_lock); 631 632 init_defaults(); 633 _method = method; 634 _entry_bci = InvocationEntryBci; 635 // We have no exception handler or deopt handler make the 636 // values something that will never match a pc like the nmethod vtable entry 637 _exception_offset = 0; 638 _deoptimize_offset = 0; 639 _deoptimize_mh_offset = 0; 640 _orig_pc_offset = 0; 641 642 _consts_offset = data_offset(); 643 _stub_offset = data_offset(); 644 _oops_offset = data_offset(); 645 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 646 _scopes_pcs_offset = _scopes_data_offset; 647 _dependencies_offset = _scopes_pcs_offset; 648 _handler_table_offset = _dependencies_offset; 649 _nul_chk_table_offset = _handler_table_offset; 650 _nmethod_end_offset = _nul_chk_table_offset; 651 _compile_id = compile_id; 652 _comp_level = CompLevel_none; 653 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 654 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 655 _osr_entry_point = NULL; 656 _exception_cache = NULL; 657 _pc_desc_cache.reset_to(NULL); 658 659 code_buffer->copy_oops_to(this); 660 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 661 CodeCache::add_scavenge_root_nmethod(this); 662 } 663 debug_only(verify_scavenge_root_oops()); 664 CodeCache::commit(this); 665 } 666 667 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 668 ttyLocker ttyl; // keep the following output all in one block 669 // This output goes directly to the tty, not the compiler log. 670 // To enable tools to match it up with the compilation activity, 671 // be sure to tag this tty output with the compile ID. 672 if (xtty != NULL) { 673 xtty->begin_head("print_native_nmethod"); 674 xtty->method(_method); 675 xtty->stamp(); 676 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 677 } 678 // print the header part first 679 print(); 680 // then print the requested information 681 if (PrintNativeNMethods) { 682 print_code(); 683 oop_maps->print(); 684 } 685 if (PrintRelocations) { 686 print_relocations(); 687 } 688 if (xtty != NULL) { 689 xtty->tail("print_native_nmethod"); 690 } 691 } 692 Events::log("Create nmethod " INTPTR_FORMAT, this); 693 } 694 695 // For dtrace wrappers 696 #ifdef HAVE_DTRACE_H 697 nmethod::nmethod( 698 methodOop method, 699 int nmethod_size, 700 CodeOffsets* offsets, 701 CodeBuffer* code_buffer, 702 int frame_size) 703 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 704 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 705 _native_receiver_sp_offset(in_ByteSize(-1)), 706 _native_basic_lock_sp_offset(in_ByteSize(-1)) 707 { 708 { 709 debug_only(No_Safepoint_Verifier nsv;) 710 assert_locked_or_safepoint(CodeCache_lock); 711 712 init_defaults(); 713 _method = method; 714 _entry_bci = InvocationEntryBci; 715 // We have no exception handler or deopt handler make the 716 // values something that will never match a pc like the nmethod vtable entry 717 _exception_offset = 0; 718 _deoptimize_offset = 0; 719 _deoptimize_mh_offset = 0; 720 _unwind_handler_offset = -1; 721 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 722 _orig_pc_offset = 0; 723 _consts_offset = data_offset(); 724 _stub_offset = data_offset(); 725 _oops_offset = data_offset(); 726 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 727 _scopes_pcs_offset = _scopes_data_offset; 728 _dependencies_offset = _scopes_pcs_offset; 729 _handler_table_offset = _dependencies_offset; 730 _nul_chk_table_offset = _handler_table_offset; 731 _nmethod_end_offset = _nul_chk_table_offset; 732 _compile_id = 0; // default 733 _comp_level = CompLevel_none; 734 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 735 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 736 _osr_entry_point = NULL; 737 _exception_cache = NULL; 738 _pc_desc_cache.reset_to(NULL); 739 740 code_buffer->copy_oops_to(this); 741 debug_only(verify_scavenge_root_oops()); 742 CodeCache::commit(this); 743 } 744 745 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 746 ttyLocker ttyl; // keep the following output all in one block 747 // This output goes directly to the tty, not the compiler log. 748 // To enable tools to match it up with the compilation activity, 749 // be sure to tag this tty output with the compile ID. 750 if (xtty != NULL) { 751 xtty->begin_head("print_dtrace_nmethod"); 752 xtty->method(_method); 753 xtty->stamp(); 754 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 755 } 756 // print the header part first 757 print(); 758 // then print the requested information 759 if (PrintNMethods) { 760 print_code(); 761 } 762 if (PrintRelocations) { 763 print_relocations(); 764 } 765 if (xtty != NULL) { 766 xtty->tail("print_dtrace_nmethod"); 767 } 768 } 769 Events::log("Create nmethod " INTPTR_FORMAT, this); 770 } 771 #endif // def HAVE_DTRACE_H 772 773 void* nmethod::operator new(size_t size, int nmethod_size) { 774 // Always leave some room in the CodeCache for I2C/C2I adapters 775 if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) return NULL; 776 return CodeCache::allocate(nmethod_size); 777 } 778 779 780 nmethod::nmethod( 781 methodOop method, 782 int nmethod_size, 783 int compile_id, 784 int entry_bci, 785 CodeOffsets* offsets, 786 int orig_pc_offset, 787 DebugInformationRecorder* debug_info, 788 Dependencies* dependencies, 789 CodeBuffer *code_buffer, 790 int frame_size, 791 OopMapSet* oop_maps, 792 ExceptionHandlerTable* handler_table, 793 ImplicitExceptionTable* nul_chk_table, 794 AbstractCompiler* compiler, 795 int comp_level 796 ) 797 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 798 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 799 _native_receiver_sp_offset(in_ByteSize(-1)), 800 _native_basic_lock_sp_offset(in_ByteSize(-1)) 801 { 802 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 803 { 804 debug_only(No_Safepoint_Verifier nsv;) 805 assert_locked_or_safepoint(CodeCache_lock); 806 807 init_defaults(); 808 _method = method; 809 _entry_bci = entry_bci; 810 _compile_id = compile_id; 811 _comp_level = comp_level; 812 _compiler = compiler; 813 _orig_pc_offset = orig_pc_offset; 814 815 // Section offsets 816 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 817 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 818 819 // Exception handler and deopt handler are in the stub section 820 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 821 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 822 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 823 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 824 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 825 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 826 } else { 827 _deoptimize_mh_offset = -1; 828 } 829 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 830 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 831 } else { 832 _unwind_handler_offset = -1; 833 } 834 835 _oops_offset = data_offset(); 836 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize); 837 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 838 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 839 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 840 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 841 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 842 843 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 844 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 845 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 846 _exception_cache = NULL; 847 _pc_desc_cache.reset_to(scopes_pcs_begin()); 848 849 // Copy contents of ScopeDescRecorder to nmethod 850 code_buffer->copy_oops_to(this); 851 debug_info->copy_to(this); 852 dependencies->copy_to(this); 853 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 854 CodeCache::add_scavenge_root_nmethod(this); 855 } 856 debug_only(verify_scavenge_root_oops()); 857 858 CodeCache::commit(this); 859 860 // Copy contents of ExceptionHandlerTable to nmethod 861 handler_table->copy_to(this); 862 nul_chk_table->copy_to(this); 863 864 // we use the information of entry points to find out if a method is 865 // static or non static 866 assert(compiler->is_c2() || 867 _method->is_static() == (entry_point() == _verified_entry_point), 868 " entry points must be same for static methods and vice versa"); 869 } 870 871 bool printnmethods = PrintNMethods 872 || CompilerOracle::should_print(_method) 873 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 874 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 875 print_nmethod(printnmethods); 876 } 877 878 // Note: Do not verify in here as the CodeCache_lock is 879 // taken which would conflict with the CompiledIC_lock 880 // which taken during the verification of call sites. 881 // (was bug - gri 10/25/99) 882 883 Events::log("Create nmethod " INTPTR_FORMAT, this); 884 } 885 886 887 // Print a short set of xml attributes to identify this nmethod. The 888 // output should be embedded in some other element. 889 void nmethod::log_identity(xmlStream* log) const { 890 log->print(" compile_id='%d'", compile_id()); 891 const char* nm_kind = compile_kind(); 892 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 893 if (compiler() != NULL) { 894 log->print(" compiler='%s'", compiler()->name()); 895 } 896 if (TieredCompilation) { 897 log->print(" level='%d'", comp_level()); 898 } 899 } 900 901 902 #define LOG_OFFSET(log, name) \ 903 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 904 log->print(" " XSTR(name) "_offset='%d'" , \ 905 (intptr_t)name##_begin() - (intptr_t)this) 906 907 908 void nmethod::log_new_nmethod() const { 909 if (LogCompilation && xtty != NULL) { 910 ttyLocker ttyl; 911 HandleMark hm; 912 xtty->begin_elem("nmethod"); 913 log_identity(xtty); 914 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 915 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 916 917 LOG_OFFSET(xtty, relocation); 918 LOG_OFFSET(xtty, consts); 919 LOG_OFFSET(xtty, insts); 920 LOG_OFFSET(xtty, stub); 921 LOG_OFFSET(xtty, scopes_data); 922 LOG_OFFSET(xtty, scopes_pcs); 923 LOG_OFFSET(xtty, dependencies); 924 LOG_OFFSET(xtty, handler_table); 925 LOG_OFFSET(xtty, nul_chk_table); 926 LOG_OFFSET(xtty, oops); 927 928 xtty->method(method()); 929 xtty->stamp(); 930 xtty->end_elem(); 931 } 932 } 933 934 #undef LOG_OFFSET 935 936 937 // Print out more verbose output usually for a newly created nmethod. 938 void nmethod::print_on(outputStream* st, const char* msg) const { 939 if (st != NULL) { 940 ttyLocker ttyl; 941 CompileTask::print_compilation(st, this, msg); 942 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); 943 } 944 } 945 946 947 void nmethod::print_nmethod(bool printmethod) { 948 ttyLocker ttyl; // keep the following output all in one block 949 if (xtty != NULL) { 950 xtty->begin_head("print_nmethod"); 951 xtty->stamp(); 952 xtty->end_head(); 953 } 954 // print the header part first 955 print(); 956 // then print the requested information 957 if (printmethod) { 958 print_code(); 959 print_pcs(); 960 oop_maps()->print(); 961 } 962 if (PrintDebugInfo) { 963 print_scopes(); 964 } 965 if (PrintRelocations) { 966 print_relocations(); 967 } 968 if (PrintDependencies) { 969 print_dependencies(); 970 } 971 if (PrintExceptionHandlers) { 972 print_handler_table(); 973 print_nul_chk_table(); 974 } 975 if (xtty != NULL) { 976 xtty->tail("print_nmethod"); 977 } 978 } 979 980 981 // Promote one word from an assembly-time handle to a live embedded oop. 982 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 983 if (handle == NULL || 984 // As a special case, IC oops are initialized to 1 or -1. 985 handle == (jobject) Universe::non_oop_word()) { 986 (*dest) = (oop) handle; 987 } else { 988 (*dest) = JNIHandles::resolve_non_null(handle); 989 } 990 } 991 992 993 void nmethod::copy_oops(GrowableArray<jobject>* array) { 994 //assert(oops_size() == 0, "do this handshake just once, please"); 995 int length = array->length(); 996 assert((address)(oops_begin() + length) <= data_end(), "oops big enough"); 997 oop* dest = oops_begin(); 998 for (int index = 0 ; index < length; index++) { 999 initialize_immediate_oop(&dest[index], array->at(index)); 1000 } 1001 1002 // Now we can fix up all the oops in the code. We need to do this 1003 // in the code because the assembler uses jobjects as placeholders. 1004 // The code and relocations have already been initialized by the 1005 // CodeBlob constructor, so it is valid even at this early point to 1006 // iterate over relocations and patch the code. 1007 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1008 } 1009 1010 1011 bool nmethod::is_at_poll_return(address pc) { 1012 RelocIterator iter(this, pc, pc+1); 1013 while (iter.next()) { 1014 if (iter.type() == relocInfo::poll_return_type) 1015 return true; 1016 } 1017 return false; 1018 } 1019 1020 1021 bool nmethod::is_at_poll_or_poll_return(address pc) { 1022 RelocIterator iter(this, pc, pc+1); 1023 while (iter.next()) { 1024 relocInfo::relocType t = iter.type(); 1025 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1026 return true; 1027 } 1028 return false; 1029 } 1030 1031 1032 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1033 // re-patch all oop-bearing instructions, just in case some oops moved 1034 RelocIterator iter(this, begin, end); 1035 while (iter.next()) { 1036 if (iter.type() == relocInfo::oop_type) { 1037 oop_Relocation* reloc = iter.oop_reloc(); 1038 if (initialize_immediates && reloc->oop_is_immediate()) { 1039 oop* dest = reloc->oop_addr(); 1040 initialize_immediate_oop(dest, (jobject) *dest); 1041 } 1042 // Refresh the oop-related bits of this instruction. 1043 reloc->fix_oop_relocation(); 1044 } 1045 1046 // There must not be any interfering patches or breakpoints. 1047 assert(!(iter.type() == relocInfo::breakpoint_type 1048 && iter.breakpoint_reloc()->active()), 1049 "no active breakpoint"); 1050 } 1051 } 1052 1053 1054 void nmethod::verify_oop_relocations() { 1055 // Ensure sure that the code matches the current oop values 1056 RelocIterator iter(this, NULL, NULL); 1057 while (iter.next()) { 1058 if (iter.type() == relocInfo::oop_type) { 1059 oop_Relocation* reloc = iter.oop_reloc(); 1060 if (!reloc->oop_is_immediate()) { 1061 reloc->verify_oop_relocation(); 1062 } 1063 } 1064 } 1065 } 1066 1067 1068 ScopeDesc* nmethod::scope_desc_at(address pc) { 1069 PcDesc* pd = pc_desc_at(pc); 1070 guarantee(pd != NULL, "scope must be present"); 1071 return new ScopeDesc(this, pd->scope_decode_offset(), 1072 pd->obj_decode_offset(), pd->should_reexecute(), 1073 pd->return_oop()); 1074 } 1075 1076 1077 void nmethod::clear_inline_caches() { 1078 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1079 if (is_zombie()) { 1080 return; 1081 } 1082 1083 RelocIterator iter(this); 1084 while (iter.next()) { 1085 iter.reloc()->clear_inline_cache(); 1086 } 1087 } 1088 1089 1090 void nmethod::cleanup_inline_caches() { 1091 1092 assert_locked_or_safepoint(CompiledIC_lock); 1093 1094 // If the method is not entrant or zombie then a JMP is plastered over the 1095 // first few bytes. If an oop in the old code was there, that oop 1096 // should not get GC'd. Skip the first few bytes of oops on 1097 // not-entrant methods. 1098 address low_boundary = verified_entry_point(); 1099 if (!is_in_use()) { 1100 low_boundary += NativeJump::instruction_size; 1101 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1102 // This means that the low_boundary is going to be a little too high. 1103 // This shouldn't matter, since oops of non-entrant methods are never used. 1104 // In fact, why are we bothering to look at oops in a non-entrant method?? 1105 } 1106 1107 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1108 ResourceMark rm; 1109 RelocIterator iter(this, low_boundary); 1110 while(iter.next()) { 1111 switch(iter.type()) { 1112 case relocInfo::virtual_call_type: 1113 case relocInfo::opt_virtual_call_type: { 1114 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1115 // Ok, to lookup references to zombies here 1116 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1117 if( cb != NULL && cb->is_nmethod() ) { 1118 nmethod* nm = (nmethod*)cb; 1119 // Clean inline caches pointing to both zombie and not_entrant methods 1120 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1121 } 1122 break; 1123 } 1124 case relocInfo::static_call_type: { 1125 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1126 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1127 if( cb != NULL && cb->is_nmethod() ) { 1128 nmethod* nm = (nmethod*)cb; 1129 // Clean inline caches pointing to both zombie and not_entrant methods 1130 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1131 } 1132 break; 1133 } 1134 } 1135 } 1136 } 1137 1138 // This is a private interface with the sweeper. 1139 void nmethod::mark_as_seen_on_stack() { 1140 assert(is_not_entrant(), "must be a non-entrant method"); 1141 // Set the traversal mark to ensure that the sweeper does 2 1142 // cleaning passes before moving to zombie. 1143 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1144 } 1145 1146 // Tell if a non-entrant method can be converted to a zombie (i.e., 1147 // there are no activations on the stack, not in use by the VM, 1148 // and not in use by the ServiceThread) 1149 bool nmethod::can_not_entrant_be_converted() { 1150 assert(is_not_entrant(), "must be a non-entrant method"); 1151 1152 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1153 // count can be greater than the stack traversal count before it hits the 1154 // nmethod for the second time. 1155 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1156 !is_locked_by_vm(); 1157 } 1158 1159 void nmethod::inc_decompile_count() { 1160 if (!is_compiled_by_c2()) return; 1161 // Could be gated by ProfileTraps, but do not bother... 1162 methodOop m = method(); 1163 if (m == NULL) return; 1164 methodDataOop mdo = m->method_data(); 1165 if (mdo == NULL) return; 1166 // There is a benign race here. See comments in methodDataOop.hpp. 1167 mdo->inc_decompile_count(); 1168 } 1169 1170 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1171 1172 post_compiled_method_unload(); 1173 1174 // Since this nmethod is being unloaded, make sure that dependencies 1175 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1176 // indicate that this work is being done during a GC. 1177 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1178 assert(is_alive != NULL, "Should be non-NULL"); 1179 // A non-NULL is_alive closure indicates that this is being called during GC. 1180 flush_dependencies(is_alive); 1181 1182 // Break cycle between nmethod & method 1183 if (TraceClassUnloading && WizardMode) { 1184 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1185 " unloadable], methodOop(" INTPTR_FORMAT 1186 "), cause(" INTPTR_FORMAT ")", 1187 this, (address)_method, (address)cause); 1188 if (!Universe::heap()->is_gc_active()) 1189 cause->klass()->print(); 1190 } 1191 // Unlink the osr method, so we do not look this up again 1192 if (is_osr_method()) { 1193 invalidate_osr_method(); 1194 } 1195 // If _method is already NULL the methodOop is about to be unloaded, 1196 // so we don't have to break the cycle. Note that it is possible to 1197 // have the methodOop live here, in case we unload the nmethod because 1198 // it is pointing to some oop (other than the methodOop) being unloaded. 1199 if (_method != NULL) { 1200 // OSR methods point to the methodOop, but the methodOop does not 1201 // point back! 1202 if (_method->code() == this) { 1203 _method->clear_code(); // Break a cycle 1204 } 1205 _method = NULL; // Clear the method of this dead nmethod 1206 } 1207 // Make the class unloaded - i.e., change state and notify sweeper 1208 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1209 if (is_in_use()) { 1210 // Transitioning directly from live to unloaded -- so 1211 // we need to force a cache clean-up; remember this 1212 // for later on. 1213 CodeCache::set_needs_cache_clean(true); 1214 } 1215 _state = unloaded; 1216 1217 // Log the unloading. 1218 log_state_change(); 1219 1220 // The methodOop is gone at this point 1221 assert(_method == NULL, "Tautology"); 1222 1223 set_osr_link(NULL); 1224 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1225 NMethodSweeper::notify(this); 1226 } 1227 1228 void nmethod::invalidate_osr_method() { 1229 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1230 // Remove from list of active nmethods 1231 if (method() != NULL) 1232 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); 1233 // Set entry as invalid 1234 _entry_bci = InvalidOSREntryBci; 1235 } 1236 1237 void nmethod::log_state_change() const { 1238 if (LogCompilation) { 1239 if (xtty != NULL) { 1240 ttyLocker ttyl; // keep the following output all in one block 1241 if (_state == unloaded) { 1242 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1243 os::current_thread_id()); 1244 } else { 1245 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1246 os::current_thread_id(), 1247 (_state == zombie ? " zombie='1'" : "")); 1248 } 1249 log_identity(xtty); 1250 xtty->stamp(); 1251 xtty->end_elem(); 1252 } 1253 } 1254 if (PrintCompilation && _state != unloaded) { 1255 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1256 } 1257 } 1258 1259 // Common functionality for both make_not_entrant and make_zombie 1260 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1261 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1262 assert(!is_zombie(), "should not already be a zombie"); 1263 1264 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1265 nmethodLocker nml(this); 1266 methodHandle the_method(method()); 1267 No_Safepoint_Verifier nsv; 1268 1269 { 1270 // invalidate osr nmethod before acquiring the patching lock since 1271 // they both acquire leaf locks and we don't want a deadlock. 1272 // This logic is equivalent to the logic below for patching the 1273 // verified entry point of regular methods. 1274 if (is_osr_method()) { 1275 // this effectively makes the osr nmethod not entrant 1276 invalidate_osr_method(); 1277 } 1278 1279 // Enter critical section. Does not block for safepoint. 1280 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1281 1282 if (_state == state) { 1283 // another thread already performed this transition so nothing 1284 // to do, but return false to indicate this. 1285 return false; 1286 } 1287 1288 // The caller can be calling the method statically or through an inline 1289 // cache call. 1290 if (!is_osr_method() && !is_not_entrant()) { 1291 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1292 SharedRuntime::get_handle_wrong_method_stub()); 1293 } 1294 1295 if (is_in_use()) { 1296 // It's a true state change, so mark the method as decompiled. 1297 // Do it only for transition from alive. 1298 inc_decompile_count(); 1299 } 1300 1301 // Change state 1302 _state = state; 1303 1304 // Log the transition once 1305 log_state_change(); 1306 1307 // Remove nmethod from method. 1308 // We need to check if both the _code and _from_compiled_code_entry_point 1309 // refer to this nmethod because there is a race in setting these two fields 1310 // in methodOop as seen in bugid 4947125. 1311 // If the vep() points to the zombie nmethod, the memory for the nmethod 1312 // could be flushed and the compiler and vtable stubs could still call 1313 // through it. 1314 if (method() != NULL && (method()->code() == this || 1315 method()->from_compiled_entry() == verified_entry_point())) { 1316 HandleMark hm; 1317 method()->clear_code(); 1318 } 1319 1320 if (state == not_entrant) { 1321 mark_as_seen_on_stack(); 1322 } 1323 1324 } // leave critical region under Patching_lock 1325 1326 // When the nmethod becomes zombie it is no longer alive so the 1327 // dependencies must be flushed. nmethods in the not_entrant 1328 // state will be flushed later when the transition to zombie 1329 // happens or they get unloaded. 1330 if (state == zombie) { 1331 { 1332 // Flushing dependecies must be done before any possible 1333 // safepoint can sneak in, otherwise the oops used by the 1334 // dependency logic could have become stale. 1335 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1336 flush_dependencies(NULL); 1337 } 1338 1339 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1340 // event and it hasn't already been reported for this nmethod then 1341 // report it now. The event may have been reported earilier if the GC 1342 // marked it for unloading). JvmtiDeferredEventQueue support means 1343 // we no longer go to a safepoint here. 1344 post_compiled_method_unload(); 1345 1346 #ifdef ASSERT 1347 // It's no longer safe to access the oops section since zombie 1348 // nmethods aren't scanned for GC. 1349 _oops_are_stale = true; 1350 #endif 1351 } else { 1352 assert(state == not_entrant, "other cases may need to be handled differently"); 1353 } 1354 1355 if (TraceCreateZombies) { 1356 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1357 } 1358 1359 // Make sweeper aware that there is a zombie method that needs to be removed 1360 NMethodSweeper::notify(this); 1361 1362 return true; 1363 } 1364 1365 void nmethod::flush() { 1366 // Note that there are no valid oops in the nmethod anymore. 1367 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1368 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1369 1370 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1371 assert_locked_or_safepoint(CodeCache_lock); 1372 1373 // completely deallocate this method 1374 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); 1375 if (PrintMethodFlushing) { 1376 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1377 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1378 } 1379 1380 // We need to deallocate any ExceptionCache data. 1381 // Note that we do not need to grab the nmethod lock for this, it 1382 // better be thread safe if we're disposing of it! 1383 ExceptionCache* ec = exception_cache(); 1384 set_exception_cache(NULL); 1385 while(ec != NULL) { 1386 ExceptionCache* next = ec->next(); 1387 delete ec; 1388 ec = next; 1389 } 1390 1391 if (on_scavenge_root_list()) { 1392 CodeCache::drop_scavenge_root_nmethod(this); 1393 } 1394 1395 if (is_speculatively_disconnected()) { 1396 CodeCache::remove_saved_code(this); 1397 } 1398 1399 #ifdef SHARK 1400 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1401 #endif // SHARK 1402 1403 ((CodeBlob*)(this))->flush(); 1404 1405 CodeCache::free(this); 1406 } 1407 1408 1409 // 1410 // Notify all classes this nmethod is dependent on that it is no 1411 // longer dependent. This should only be called in two situations. 1412 // First, when a nmethod transitions to a zombie all dependents need 1413 // to be clear. Since zombification happens at a safepoint there's no 1414 // synchronization issues. The second place is a little more tricky. 1415 // During phase 1 of mark sweep class unloading may happen and as a 1416 // result some nmethods may get unloaded. In this case the flushing 1417 // of dependencies must happen during phase 1 since after GC any 1418 // dependencies in the unloaded nmethod won't be updated, so 1419 // traversing the dependency information in unsafe. In that case this 1420 // function is called with a non-NULL argument and this function only 1421 // notifies instanceKlasses that are reachable 1422 1423 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1424 assert_locked_or_safepoint(CodeCache_lock); 1425 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1426 "is_alive is non-NULL if and only if we are called during GC"); 1427 if (!has_flushed_dependencies()) { 1428 set_has_flushed_dependencies(); 1429 for (Dependencies::DepStream deps(this); deps.next(); ) { 1430 klassOop klass = deps.context_type(); 1431 if (klass == NULL) continue; // ignore things like evol_method 1432 1433 // During GC the is_alive closure is non-NULL, and is used to 1434 // determine liveness of dependees that need to be updated. 1435 if (is_alive == NULL || is_alive->do_object_b(klass)) { 1436 instanceKlass::cast(klass)->remove_dependent_nmethod(this); 1437 } 1438 } 1439 } 1440 } 1441 1442 1443 // If this oop is not live, the nmethod can be unloaded. 1444 bool nmethod::can_unload(BoolObjectClosure* is_alive, 1445 OopClosure* keep_alive, 1446 oop* root, bool unloading_occurred) { 1447 assert(root != NULL, "just checking"); 1448 oop obj = *root; 1449 if (obj == NULL || is_alive->do_object_b(obj)) { 1450 return false; 1451 } 1452 if (obj->is_compiledICHolder()) { 1453 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); 1454 if (is_alive->do_object_b( 1455 cichk_oop->holder_method()->method_holder()) && 1456 is_alive->do_object_b(cichk_oop->holder_klass())) { 1457 // The oop should be kept alive 1458 keep_alive->do_oop(root); 1459 return false; 1460 } 1461 } 1462 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1463 // simply because one of its constant oops has gone dead. 1464 // No actual classes need to be unloaded in order for this to occur. 1465 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1466 make_unloaded(is_alive, obj); 1467 return true; 1468 } 1469 1470 // ------------------------------------------------------------------ 1471 // post_compiled_method_load_event 1472 // new method for install_code() path 1473 // Transfer information from compilation to jvmti 1474 void nmethod::post_compiled_method_load_event() { 1475 1476 methodOop moop = method(); 1477 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1478 moop->klass_name()->bytes(), 1479 moop->klass_name()->utf8_length(), 1480 moop->name()->bytes(), 1481 moop->name()->utf8_length(), 1482 moop->signature()->bytes(), 1483 moop->signature()->utf8_length(), 1484 insts_begin(), insts_size()); 1485 1486 if (JvmtiExport::should_post_compiled_method_load() || 1487 JvmtiExport::should_post_compiled_method_unload()) { 1488 get_and_cache_jmethod_id(); 1489 } 1490 1491 if (JvmtiExport::should_post_compiled_method_load()) { 1492 // Let the Service thread (which is a real Java thread) post the event 1493 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1494 JvmtiDeferredEventQueue::enqueue( 1495 JvmtiDeferredEvent::compiled_method_load_event(this)); 1496 } 1497 } 1498 1499 jmethodID nmethod::get_and_cache_jmethod_id() { 1500 if (_jmethod_id == NULL) { 1501 // Cache the jmethod_id since it can no longer be looked up once the 1502 // method itself has been marked for unloading. 1503 _jmethod_id = method()->jmethod_id(); 1504 } 1505 return _jmethod_id; 1506 } 1507 1508 void nmethod::post_compiled_method_unload() { 1509 if (unload_reported()) { 1510 // During unloading we transition to unloaded and then to zombie 1511 // and the unloading is reported during the first transition. 1512 return; 1513 } 1514 1515 assert(_method != NULL && !is_unloaded(), "just checking"); 1516 DTRACE_METHOD_UNLOAD_PROBE(method()); 1517 1518 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1519 // post the event. Sometime later this nmethod will be made a zombie 1520 // by the sweeper but the methodOop will not be valid at that point. 1521 // If the _jmethod_id is null then no load event was ever requested 1522 // so don't bother posting the unload. The main reason for this is 1523 // that the jmethodID is a weak reference to the methodOop so if 1524 // it's being unloaded there's no way to look it up since the weak 1525 // ref will have been cleared. 1526 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1527 assert(!unload_reported(), "already unloaded"); 1528 JvmtiDeferredEvent event = 1529 JvmtiDeferredEvent::compiled_method_unload_event(this, 1530 _jmethod_id, insts_begin()); 1531 if (SafepointSynchronize::is_at_safepoint()) { 1532 // Don't want to take the queueing lock. Add it as pending and 1533 // it will get enqueued later. 1534 JvmtiDeferredEventQueue::add_pending_event(event); 1535 } else { 1536 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1537 JvmtiDeferredEventQueue::enqueue(event); 1538 } 1539 } 1540 1541 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1542 // any time. As the nmethod is being unloaded now we mark it has 1543 // having the unload event reported - this will ensure that we don't 1544 // attempt to report the event in the unlikely scenario where the 1545 // event is enabled at the time the nmethod is made a zombie. 1546 set_unload_reported(); 1547 } 1548 1549 // This is called at the end of the strong tracing/marking phase of a 1550 // GC to unload an nmethod if it contains otherwise unreachable 1551 // oops. 1552 1553 void nmethod::do_unloading(BoolObjectClosure* is_alive, 1554 OopClosure* keep_alive, bool unloading_occurred) { 1555 // Make sure the oop's ready to receive visitors 1556 assert(!is_zombie() && !is_unloaded(), 1557 "should not call follow on zombie or unloaded nmethod"); 1558 1559 // If the method is not entrant then a JMP is plastered over the 1560 // first few bytes. If an oop in the old code was there, that oop 1561 // should not get GC'd. Skip the first few bytes of oops on 1562 // not-entrant methods. 1563 address low_boundary = verified_entry_point(); 1564 if (is_not_entrant()) { 1565 low_boundary += NativeJump::instruction_size; 1566 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1567 // (See comment above.) 1568 } 1569 1570 // The RedefineClasses() API can cause the class unloading invariant 1571 // to no longer be true. See jvmtiExport.hpp for details. 1572 // Also, leave a debugging breadcrumb in local flag. 1573 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1574 if (a_class_was_redefined) { 1575 // This set of the unloading_occurred flag is done before the 1576 // call to post_compiled_method_unload() so that the unloading 1577 // of this nmethod is reported. 1578 unloading_occurred = true; 1579 } 1580 1581 // Follow methodOop 1582 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { 1583 return; 1584 } 1585 1586 // Exception cache 1587 ExceptionCache* ec = exception_cache(); 1588 while (ec != NULL) { 1589 oop* ex_addr = (oop*)ec->exception_type_addr(); 1590 oop ex = *ex_addr; 1591 ExceptionCache* next_ec = ec->next(); 1592 if (ex != NULL && !is_alive->do_object_b(ex)) { 1593 assert(!ex->is_compiledICHolder(), "Possible error here"); 1594 remove_from_exception_cache(ec); 1595 } 1596 ec = next_ec; 1597 } 1598 1599 // If class unloading occurred we first iterate over all inline caches and 1600 // clear ICs where the cached oop is referring to an unloaded klass or method. 1601 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1602 // iteration below. 1603 if (unloading_occurred) { 1604 RelocIterator iter(this, low_boundary); 1605 while(iter.next()) { 1606 if (iter.type() == relocInfo::virtual_call_type) { 1607 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1608 oop ic_oop = ic->cached_oop(); 1609 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { 1610 // The only exception is compiledICHolder oops which may 1611 // yet be marked below. (We check this further below). 1612 if (ic_oop->is_compiledICHolder()) { 1613 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); 1614 if (is_alive->do_object_b( 1615 cichk_oop->holder_method()->method_holder()) && 1616 is_alive->do_object_b(cichk_oop->holder_klass())) { 1617 continue; 1618 } 1619 } 1620 ic->set_to_clean(); 1621 assert(ic->cached_oop() == NULL, 1622 "cached oop in IC should be cleared"); 1623 } 1624 } 1625 } 1626 } 1627 1628 // Compiled code 1629 RelocIterator iter(this, low_boundary); 1630 while (iter.next()) { 1631 if (iter.type() == relocInfo::oop_type) { 1632 oop_Relocation* r = iter.oop_reloc(); 1633 // In this loop, we must only traverse those oops directly embedded in 1634 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1635 assert(1 == (r->oop_is_immediate()) + 1636 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1637 "oop must be found in exactly one place"); 1638 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1639 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { 1640 return; 1641 } 1642 } 1643 } 1644 } 1645 1646 1647 // Scopes 1648 for (oop* p = oops_begin(); p < oops_end(); p++) { 1649 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1650 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { 1651 return; 1652 } 1653 } 1654 1655 #ifndef PRODUCT 1656 // This nmethod was not unloaded; check below that all CompiledICs 1657 // refer to marked oops. 1658 { 1659 RelocIterator iter(this, low_boundary); 1660 while (iter.next()) { 1661 if (iter.type() == relocInfo::virtual_call_type) { 1662 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1663 oop ic_oop = ic->cached_oop(); 1664 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), 1665 "Found unmarked ic_oop in reachable nmethod"); 1666 } 1667 } 1668 } 1669 #endif // !PRODUCT 1670 } 1671 1672 // This method is called twice during GC -- once while 1673 // tracing the "active" nmethods on thread stacks during 1674 // the (strong) marking phase, and then again when walking 1675 // the code cache contents during the weak roots processing 1676 // phase. The two uses are distinguished by means of the 1677 // 'do_strong_roots_only' flag, which is true in the first 1678 // case. We want to walk the weak roots in the nmethod 1679 // only in the second case. The weak roots in the nmethod 1680 // are the oops in the ExceptionCache and the InlineCache 1681 // oops. 1682 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { 1683 // make sure the oops ready to receive visitors 1684 assert(!is_zombie() && !is_unloaded(), 1685 "should not call follow on zombie or unloaded nmethod"); 1686 1687 // If the method is not entrant or zombie then a JMP is plastered over the 1688 // first few bytes. If an oop in the old code was there, that oop 1689 // should not get GC'd. Skip the first few bytes of oops on 1690 // not-entrant methods. 1691 address low_boundary = verified_entry_point(); 1692 if (is_not_entrant()) { 1693 low_boundary += NativeJump::instruction_size; 1694 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1695 // (See comment above.) 1696 } 1697 1698 // Compiled code 1699 f->do_oop((oop*) &_method); 1700 if (!do_strong_roots_only) { 1701 // weak roots processing phase -- update ExceptionCache oops 1702 ExceptionCache* ec = exception_cache(); 1703 while(ec != NULL) { 1704 f->do_oop((oop*)ec->exception_type_addr()); 1705 ec = ec->next(); 1706 } 1707 } // Else strong roots phase -- skip oops in ExceptionCache 1708 1709 RelocIterator iter(this, low_boundary); 1710 1711 while (iter.next()) { 1712 if (iter.type() == relocInfo::oop_type ) { 1713 oop_Relocation* r = iter.oop_reloc(); 1714 // In this loop, we must only follow those oops directly embedded in 1715 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1716 assert(1 == (r->oop_is_immediate()) + 1717 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1718 "oop must be found in exactly one place"); 1719 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1720 f->do_oop(r->oop_addr()); 1721 } 1722 } 1723 } 1724 1725 // Scopes 1726 // This includes oop constants not inlined in the code stream. 1727 for (oop* p = oops_begin(); p < oops_end(); p++) { 1728 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1729 f->do_oop(p); 1730 } 1731 } 1732 1733 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1734 1735 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1736 1737 // An nmethod is "marked" if its _mark_link is set non-null. 1738 // Even if it is the end of the linked list, it will have a non-null link value, 1739 // as long as it is on the list. 1740 // This code must be MP safe, because it is used from parallel GC passes. 1741 bool nmethod::test_set_oops_do_mark() { 1742 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1743 nmethod* observed_mark_link = _oops_do_mark_link; 1744 if (observed_mark_link == NULL) { 1745 // Claim this nmethod for this thread to mark. 1746 observed_mark_link = (nmethod*) 1747 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1748 if (observed_mark_link == NULL) { 1749 1750 // Atomically append this nmethod (now claimed) to the head of the list: 1751 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1752 for (;;) { 1753 nmethod* required_mark_nmethods = observed_mark_nmethods; 1754 _oops_do_mark_link = required_mark_nmethods; 1755 observed_mark_nmethods = (nmethod*) 1756 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1757 if (observed_mark_nmethods == required_mark_nmethods) 1758 break; 1759 } 1760 // Mark was clear when we first saw this guy. 1761 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 1762 return false; 1763 } 1764 } 1765 // On fall through, another racing thread marked this nmethod before we did. 1766 return true; 1767 } 1768 1769 void nmethod::oops_do_marking_prologue() { 1770 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 1771 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1772 // We use cmpxchg_ptr instead of regular assignment here because the user 1773 // may fork a bunch of threads, and we need them all to see the same state. 1774 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1775 guarantee(observed == NULL, "no races in this sequential code"); 1776 } 1777 1778 void nmethod::oops_do_marking_epilogue() { 1779 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1780 nmethod* cur = _oops_do_mark_nmethods; 1781 while (cur != NMETHOD_SENTINEL) { 1782 assert(cur != NULL, "not NULL-terminated"); 1783 nmethod* next = cur->_oops_do_mark_link; 1784 cur->_oops_do_mark_link = NULL; 1785 cur->fix_oop_relocations(); 1786 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1787 cur = next; 1788 } 1789 void* required = _oops_do_mark_nmethods; 1790 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1791 guarantee(observed == required, "no races in this sequential code"); 1792 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 1793 } 1794 1795 class DetectScavengeRoot: public OopClosure { 1796 bool _detected_scavenge_root; 1797 public: 1798 DetectScavengeRoot() : _detected_scavenge_root(false) 1799 { NOT_PRODUCT(_print_nm = NULL); } 1800 bool detected_scavenge_root() { return _detected_scavenge_root; } 1801 virtual void do_oop(oop* p) { 1802 if ((*p) != NULL && (*p)->is_scavengable()) { 1803 NOT_PRODUCT(maybe_print(p)); 1804 _detected_scavenge_root = true; 1805 } 1806 } 1807 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1808 1809 #ifndef PRODUCT 1810 nmethod* _print_nm; 1811 void maybe_print(oop* p) { 1812 if (_print_nm == NULL) return; 1813 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1814 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 1815 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 1816 (intptr_t)(*p), (intptr_t)p); 1817 (*p)->print(); 1818 } 1819 #endif //PRODUCT 1820 }; 1821 1822 bool nmethod::detect_scavenge_root_oops() { 1823 DetectScavengeRoot detect_scavenge_root; 1824 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1825 oops_do(&detect_scavenge_root); 1826 return detect_scavenge_root.detected_scavenge_root(); 1827 } 1828 1829 // Method that knows how to preserve outgoing arguments at call. This method must be 1830 // called with a frame corresponding to a Java invoke 1831 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 1832 #ifndef SHARK 1833 if (!method()->is_native()) { 1834 SimpleScopeDesc ssd(this, fr.pc()); 1835 Bytecode_invoke call(ssd.method(), ssd.bci()); 1836 // compiled invokedynamic call sites have an implicit receiver at 1837 // resolution time, so make sure it gets GC'ed. 1838 bool has_receiver = !call.is_invokestatic(); 1839 Symbol* signature = call.signature(); 1840 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f); 1841 } 1842 #endif // !SHARK 1843 } 1844 1845 1846 oop nmethod::embeddedOop_at(u_char* p) { 1847 RelocIterator iter(this, p, p + 1); 1848 while (iter.next()) 1849 if (iter.type() == relocInfo::oop_type) { 1850 return iter.oop_reloc()->oop_value(); 1851 } 1852 return NULL; 1853 } 1854 1855 1856 inline bool includes(void* p, void* from, void* to) { 1857 return from <= p && p < to; 1858 } 1859 1860 1861 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1862 assert(count >= 2, "must be sentinel values, at least"); 1863 1864 #ifdef ASSERT 1865 // must be sorted and unique; we do a binary search in find_pc_desc() 1866 int prev_offset = pcs[0].pc_offset(); 1867 assert(prev_offset == PcDesc::lower_offset_limit, 1868 "must start with a sentinel"); 1869 for (int i = 1; i < count; i++) { 1870 int this_offset = pcs[i].pc_offset(); 1871 assert(this_offset > prev_offset, "offsets must be sorted"); 1872 prev_offset = this_offset; 1873 } 1874 assert(prev_offset == PcDesc::upper_offset_limit, 1875 "must end with a sentinel"); 1876 #endif //ASSERT 1877 1878 // Search for MethodHandle invokes and tag the nmethod. 1879 for (int i = 0; i < count; i++) { 1880 if (pcs[i].is_method_handle_invoke()) { 1881 set_has_method_handle_invokes(true); 1882 break; 1883 } 1884 } 1885 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 1886 1887 int size = count * sizeof(PcDesc); 1888 assert(scopes_pcs_size() >= size, "oob"); 1889 memcpy(scopes_pcs_begin(), pcs, size); 1890 1891 // Adjust the final sentinel downward. 1892 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1893 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1894 last_pc->set_pc_offset(content_size() + 1); 1895 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1896 // Fill any rounding gaps with copies of the last record. 1897 last_pc[1] = last_pc[0]; 1898 } 1899 // The following assert could fail if sizeof(PcDesc) is not 1900 // an integral multiple of oopSize (the rounding term). 1901 // If it fails, change the logic to always allocate a multiple 1902 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1903 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1904 } 1905 1906 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1907 assert(scopes_data_size() >= size, "oob"); 1908 memcpy(scopes_data_begin(), buffer, size); 1909 } 1910 1911 1912 #ifdef ASSERT 1913 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 1914 PcDesc* lower = nm->scopes_pcs_begin(); 1915 PcDesc* upper = nm->scopes_pcs_end(); 1916 lower += 1; // exclude initial sentinel 1917 PcDesc* res = NULL; 1918 for (PcDesc* p = lower; p < upper; p++) { 1919 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1920 if (match_desc(p, pc_offset, approximate)) { 1921 if (res == NULL) 1922 res = p; 1923 else 1924 res = (PcDesc*) badAddress; 1925 } 1926 } 1927 return res; 1928 } 1929 #endif 1930 1931 1932 // Finds a PcDesc with real-pc equal to "pc" 1933 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 1934 address base_address = code_begin(); 1935 if ((pc < base_address) || 1936 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1937 return NULL; // PC is wildly out of range 1938 } 1939 int pc_offset = (int) (pc - base_address); 1940 1941 // Check the PcDesc cache if it contains the desired PcDesc 1942 // (This as an almost 100% hit rate.) 1943 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1944 if (res != NULL) { 1945 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 1946 return res; 1947 } 1948 1949 // Fallback algorithm: quasi-linear search for the PcDesc 1950 // Find the last pc_offset less than the given offset. 1951 // The successor must be the required match, if there is a match at all. 1952 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1953 PcDesc* lower = scopes_pcs_begin(); 1954 PcDesc* upper = scopes_pcs_end(); 1955 upper -= 1; // exclude final sentinel 1956 if (lower >= upper) return NULL; // native method; no PcDescs at all 1957 1958 #define assert_LU_OK \ 1959 /* invariant on lower..upper during the following search: */ \ 1960 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1961 assert(upper->pc_offset() >= pc_offset, "sanity") 1962 assert_LU_OK; 1963 1964 // Use the last successful return as a split point. 1965 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1966 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1967 if (mid->pc_offset() < pc_offset) { 1968 lower = mid; 1969 } else { 1970 upper = mid; 1971 } 1972 1973 // Take giant steps at first (4096, then 256, then 16, then 1) 1974 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1975 const int RADIX = (1 << LOG2_RADIX); 1976 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1977 while ((mid = lower + step) < upper) { 1978 assert_LU_OK; 1979 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1980 if (mid->pc_offset() < pc_offset) { 1981 lower = mid; 1982 } else { 1983 upper = mid; 1984 break; 1985 } 1986 } 1987 assert_LU_OK; 1988 } 1989 1990 // Sneak up on the value with a linear search of length ~16. 1991 while (true) { 1992 assert_LU_OK; 1993 mid = lower + 1; 1994 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1995 if (mid->pc_offset() < pc_offset) { 1996 lower = mid; 1997 } else { 1998 upper = mid; 1999 break; 2000 } 2001 } 2002 #undef assert_LU_OK 2003 2004 if (match_desc(upper, pc_offset, approximate)) { 2005 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2006 _pc_desc_cache.add_pc_desc(upper); 2007 return upper; 2008 } else { 2009 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2010 return NULL; 2011 } 2012 } 2013 2014 2015 bool nmethod::check_all_dependencies() { 2016 bool found_check = false; 2017 // wholesale check of all dependencies 2018 for (Dependencies::DepStream deps(this); deps.next(); ) { 2019 if (deps.check_dependency() != NULL) { 2020 found_check = true; 2021 NOT_DEBUG(break); 2022 } 2023 } 2024 return found_check; // tell caller if we found anything 2025 } 2026 2027 bool nmethod::check_dependency_on(DepChange& changes) { 2028 // What has happened: 2029 // 1) a new class dependee has been added 2030 // 2) dependee and all its super classes have been marked 2031 bool found_check = false; // set true if we are upset 2032 for (Dependencies::DepStream deps(this); deps.next(); ) { 2033 // Evaluate only relevant dependencies. 2034 if (deps.spot_check_dependency_at(changes) != NULL) { 2035 found_check = true; 2036 NOT_DEBUG(break); 2037 } 2038 } 2039 return found_check; 2040 } 2041 2042 bool nmethod::is_evol_dependent_on(klassOop dependee) { 2043 instanceKlass *dependee_ik = instanceKlass::cast(dependee); 2044 objArrayOop dependee_methods = dependee_ik->methods(); 2045 for (Dependencies::DepStream deps(this); deps.next(); ) { 2046 if (deps.type() == Dependencies::evol_method) { 2047 methodOop method = deps.method_argument(0); 2048 for (int j = 0; j < dependee_methods->length(); j++) { 2049 if ((methodOop) dependee_methods->obj_at(j) == method) { 2050 // RC_TRACE macro has an embedded ResourceMark 2051 RC_TRACE(0x01000000, 2052 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2053 _method->method_holder()->klass_part()->external_name(), 2054 _method->name()->as_C_string(), 2055 _method->signature()->as_C_string(), compile_id(), 2056 method->method_holder()->klass_part()->external_name(), 2057 method->name()->as_C_string(), 2058 method->signature()->as_C_string())); 2059 if (TraceDependencies || LogCompilation) 2060 deps.log_dependency(dependee); 2061 return true; 2062 } 2063 } 2064 } 2065 } 2066 return false; 2067 } 2068 2069 // Called from mark_for_deoptimization, when dependee is invalidated. 2070 bool nmethod::is_dependent_on_method(methodOop dependee) { 2071 for (Dependencies::DepStream deps(this); deps.next(); ) { 2072 if (deps.type() != Dependencies::evol_method) 2073 continue; 2074 methodOop method = deps.method_argument(0); 2075 if (method == dependee) return true; 2076 } 2077 return false; 2078 } 2079 2080 2081 bool nmethod::is_patchable_at(address instr_addr) { 2082 assert(insts_contains(instr_addr), "wrong nmethod used"); 2083 if (is_zombie()) { 2084 // a zombie may never be patched 2085 return false; 2086 } 2087 return true; 2088 } 2089 2090 2091 address nmethod::continuation_for_implicit_exception(address pc) { 2092 // Exception happened outside inline-cache check code => we are inside 2093 // an active nmethod => use cpc to determine a return address 2094 int exception_offset = pc - code_begin(); 2095 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2096 #ifdef ASSERT 2097 if (cont_offset == 0) { 2098 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2099 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2100 HandleMark hm(thread); 2101 ResourceMark rm(thread); 2102 CodeBlob* cb = CodeCache::find_blob(pc); 2103 assert(cb != NULL && cb == this, ""); 2104 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2105 print(); 2106 method()->print_codes(); 2107 print_code(); 2108 print_pcs(); 2109 } 2110 #endif 2111 if (cont_offset == 0) { 2112 // Let the normal error handling report the exception 2113 return NULL; 2114 } 2115 return code_begin() + cont_offset; 2116 } 2117 2118 2119 2120 void nmethod_init() { 2121 // make sure you didn't forget to adjust the filler fields 2122 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2123 } 2124 2125 2126 //------------------------------------------------------------------------------------------- 2127 2128 2129 // QQQ might we make this work from a frame?? 2130 nmethodLocker::nmethodLocker(address pc) { 2131 CodeBlob* cb = CodeCache::find_blob(pc); 2132 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2133 _nm = (nmethod*)cb; 2134 lock_nmethod(_nm); 2135 } 2136 2137 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2138 // should pass zombie_ok == true. 2139 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2140 if (nm == NULL) return; 2141 Atomic::inc(&nm->_lock_count); 2142 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2143 } 2144 2145 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2146 if (nm == NULL) return; 2147 Atomic::dec(&nm->_lock_count); 2148 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2149 } 2150 2151 2152 // ----------------------------------------------------------------------------- 2153 // nmethod::get_deopt_original_pc 2154 // 2155 // Return the original PC for the given PC if: 2156 // (a) the given PC belongs to a nmethod and 2157 // (b) it is a deopt PC 2158 address nmethod::get_deopt_original_pc(const frame* fr) { 2159 if (fr->cb() == NULL) return NULL; 2160 2161 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2162 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2163 return nm->get_original_pc(fr); 2164 2165 return NULL; 2166 } 2167 2168 2169 // ----------------------------------------------------------------------------- 2170 // MethodHandle 2171 2172 bool nmethod::is_method_handle_return(address return_pc) { 2173 if (!has_method_handle_invokes()) return false; 2174 PcDesc* pd = pc_desc_at(return_pc); 2175 if (pd == NULL) 2176 return false; 2177 return pd->is_method_handle_invoke(); 2178 } 2179 2180 2181 // ----------------------------------------------------------------------------- 2182 // Verification 2183 2184 class VerifyOopsClosure: public OopClosure { 2185 nmethod* _nm; 2186 bool _ok; 2187 public: 2188 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2189 bool ok() { return _ok; } 2190 virtual void do_oop(oop* p) { 2191 if ((*p) == NULL || (*p)->is_oop()) return; 2192 if (_ok) { 2193 _nm->print_nmethod(true); 2194 _ok = false; 2195 } 2196 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2197 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2198 } 2199 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2200 }; 2201 2202 void nmethod::verify() { 2203 2204 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2205 // seems odd. 2206 2207 if( is_zombie() || is_not_entrant() ) 2208 return; 2209 2210 // Make sure all the entry points are correctly aligned for patching. 2211 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2212 2213 assert(method()->is_oop(), "must be valid"); 2214 2215 ResourceMark rm; 2216 2217 if (!CodeCache::contains(this)) { 2218 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2219 } 2220 2221 if(is_native_method() ) 2222 return; 2223 2224 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2225 if (nm != this) { 2226 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2227 this)); 2228 } 2229 2230 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2231 if (! p->verify(this)) { 2232 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2233 } 2234 } 2235 2236 VerifyOopsClosure voc(this); 2237 oops_do(&voc); 2238 assert(voc.ok(), "embedded oops must be OK"); 2239 verify_scavenge_root_oops(); 2240 2241 verify_scopes(); 2242 } 2243 2244 2245 void nmethod::verify_interrupt_point(address call_site) { 2246 // This code does not work in release mode since 2247 // owns_lock only is available in debug mode. 2248 CompiledIC* ic = NULL; 2249 Thread *cur = Thread::current(); 2250 if (CompiledIC_lock->owner() == cur || 2251 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2252 SafepointSynchronize::is_at_safepoint())) { 2253 ic = CompiledIC_at(call_site); 2254 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2255 } else { 2256 MutexLocker ml_verify (CompiledIC_lock); 2257 ic = CompiledIC_at(call_site); 2258 } 2259 PcDesc* pd = pc_desc_at(ic->end_of_call()); 2260 assert(pd != NULL, "PcDesc must exist"); 2261 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2262 pd->obj_decode_offset(), pd->should_reexecute(), 2263 pd->return_oop()); 2264 !sd->is_top(); sd = sd->sender()) { 2265 sd->verify(); 2266 } 2267 } 2268 2269 void nmethod::verify_scopes() { 2270 if( !method() ) return; // Runtime stubs have no scope 2271 if (method()->is_native()) return; // Ignore stub methods. 2272 // iterate through all interrupt point 2273 // and verify the debug information is valid. 2274 RelocIterator iter((nmethod*)this); 2275 while (iter.next()) { 2276 address stub = NULL; 2277 switch (iter.type()) { 2278 case relocInfo::virtual_call_type: 2279 verify_interrupt_point(iter.addr()); 2280 break; 2281 case relocInfo::opt_virtual_call_type: 2282 stub = iter.opt_virtual_call_reloc()->static_stub(); 2283 verify_interrupt_point(iter.addr()); 2284 break; 2285 case relocInfo::static_call_type: 2286 stub = iter.static_call_reloc()->static_stub(); 2287 //verify_interrupt_point(iter.addr()); 2288 break; 2289 case relocInfo::runtime_call_type: 2290 address destination = iter.reloc()->value(); 2291 // Right now there is no way to find out which entries support 2292 // an interrupt point. It would be nice if we had this 2293 // information in a table. 2294 break; 2295 } 2296 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2297 } 2298 } 2299 2300 2301 // ----------------------------------------------------------------------------- 2302 // Non-product code 2303 #ifndef PRODUCT 2304 2305 class DebugScavengeRoot: public OopClosure { 2306 nmethod* _nm; 2307 bool _ok; 2308 public: 2309 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2310 bool ok() { return _ok; } 2311 virtual void do_oop(oop* p) { 2312 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2313 if (_ok) { 2314 _nm->print_nmethod(true); 2315 _ok = false; 2316 } 2317 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2318 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2319 (*p)->print(); 2320 } 2321 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2322 }; 2323 2324 void nmethod::verify_scavenge_root_oops() { 2325 if (!on_scavenge_root_list()) { 2326 // Actually look inside, to verify the claim that it's clean. 2327 DebugScavengeRoot debug_scavenge_root(this); 2328 oops_do(&debug_scavenge_root); 2329 if (!debug_scavenge_root.ok()) 2330 fatal("found an unadvertised bad scavengable oop in the code cache"); 2331 } 2332 assert(scavenge_root_not_marked(), ""); 2333 } 2334 2335 #endif // PRODUCT 2336 2337 // Printing operations 2338 2339 void nmethod::print() const { 2340 ResourceMark rm; 2341 ttyLocker ttyl; // keep the following output all in one block 2342 2343 tty->print("Compiled method "); 2344 2345 if (is_compiled_by_c1()) { 2346 tty->print("(c1) "); 2347 } else if (is_compiled_by_c2()) { 2348 tty->print("(c2) "); 2349 } else if (is_compiled_by_shark()) { 2350 tty->print("(shark) "); 2351 } else { 2352 tty->print("(nm) "); 2353 } 2354 2355 print_on(tty, NULL); 2356 2357 if (WizardMode) { 2358 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2359 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2360 tty->print(" { "); 2361 if (is_in_use()) tty->print("in_use "); 2362 if (is_not_entrant()) tty->print("not_entrant "); 2363 if (is_zombie()) tty->print("zombie "); 2364 if (is_unloaded()) tty->print("unloaded "); 2365 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2366 tty->print_cr("}:"); 2367 } 2368 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2369 (address)this, 2370 (address)this + size(), 2371 size()); 2372 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2373 relocation_begin(), 2374 relocation_end(), 2375 relocation_size()); 2376 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2377 consts_begin(), 2378 consts_end(), 2379 consts_size()); 2380 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2381 insts_begin(), 2382 insts_end(), 2383 insts_size()); 2384 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2385 stub_begin(), 2386 stub_end(), 2387 stub_size()); 2388 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2389 oops_begin(), 2390 oops_end(), 2391 oops_size()); 2392 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2393 scopes_data_begin(), 2394 scopes_data_end(), 2395 scopes_data_size()); 2396 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2397 scopes_pcs_begin(), 2398 scopes_pcs_end(), 2399 scopes_pcs_size()); 2400 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2401 dependencies_begin(), 2402 dependencies_end(), 2403 dependencies_size()); 2404 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2405 handler_table_begin(), 2406 handler_table_end(), 2407 handler_table_size()); 2408 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2409 nul_chk_table_begin(), 2410 nul_chk_table_end(), 2411 nul_chk_table_size()); 2412 } 2413 2414 void nmethod::print_code() { 2415 HandleMark hm; 2416 ResourceMark m; 2417 Disassembler::decode(this); 2418 } 2419 2420 2421 #ifndef PRODUCT 2422 2423 void nmethod::print_scopes() { 2424 // Find the first pc desc for all scopes in the code and print it. 2425 ResourceMark rm; 2426 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2427 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2428 continue; 2429 2430 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2431 sd->print_on(tty, p); 2432 } 2433 } 2434 2435 void nmethod::print_dependencies() { 2436 ResourceMark rm; 2437 ttyLocker ttyl; // keep the following output all in one block 2438 tty->print_cr("Dependencies:"); 2439 for (Dependencies::DepStream deps(this); deps.next(); ) { 2440 deps.print_dependency(); 2441 klassOop ctxk = deps.context_type(); 2442 if (ctxk != NULL) { 2443 Klass* k = Klass::cast(ctxk); 2444 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { 2445 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); 2446 } 2447 } 2448 deps.log_dependency(); // put it into the xml log also 2449 } 2450 } 2451 2452 2453 void nmethod::print_relocations() { 2454 ResourceMark m; // in case methods get printed via the debugger 2455 tty->print_cr("relocations:"); 2456 RelocIterator iter(this); 2457 iter.print(); 2458 if (UseRelocIndex) { 2459 jint* index_end = (jint*)relocation_end() - 1; 2460 jint index_size = *index_end; 2461 jint* index_start = (jint*)( (address)index_end - index_size ); 2462 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2463 if (index_size > 0) { 2464 jint* ip; 2465 for (ip = index_start; ip+2 <= index_end; ip += 2) 2466 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2467 ip[0], 2468 ip[1], 2469 header_end()+ip[0], 2470 relocation_begin()-1+ip[1]); 2471 for (; ip < index_end; ip++) 2472 tty->print_cr(" (%d ?)", ip[0]); 2473 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); 2474 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2475 } 2476 } 2477 } 2478 2479 2480 void nmethod::print_pcs() { 2481 ResourceMark m; // in case methods get printed via debugger 2482 tty->print_cr("pc-bytecode offsets:"); 2483 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2484 p->print(this); 2485 } 2486 } 2487 2488 #endif // PRODUCT 2489 2490 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2491 RelocIterator iter(this, begin, end); 2492 bool have_one = false; 2493 while (iter.next()) { 2494 have_one = true; 2495 switch (iter.type()) { 2496 case relocInfo::none: return "no_reloc"; 2497 case relocInfo::oop_type: { 2498 stringStream st; 2499 oop_Relocation* r = iter.oop_reloc(); 2500 oop obj = r->oop_value(); 2501 st.print("oop("); 2502 if (obj == NULL) st.print("NULL"); 2503 else obj->print_value_on(&st); 2504 st.print(")"); 2505 return st.as_string(); 2506 } 2507 case relocInfo::virtual_call_type: return "virtual_call"; 2508 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2509 case relocInfo::static_call_type: return "static_call"; 2510 case relocInfo::static_stub_type: return "static_stub"; 2511 case relocInfo::runtime_call_type: return "runtime_call"; 2512 case relocInfo::external_word_type: return "external_word"; 2513 case relocInfo::internal_word_type: return "internal_word"; 2514 case relocInfo::section_word_type: return "section_word"; 2515 case relocInfo::poll_type: return "poll"; 2516 case relocInfo::poll_return_type: return "poll_return"; 2517 case relocInfo::type_mask: return "type_bit_mask"; 2518 } 2519 } 2520 return have_one ? "other" : NULL; 2521 } 2522 2523 // Return a the last scope in (begin..end] 2524 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2525 PcDesc* p = pc_desc_near(begin+1); 2526 if (p != NULL && p->real_pc(this) <= end) { 2527 return new ScopeDesc(this, p->scope_decode_offset(), 2528 p->obj_decode_offset(), p->should_reexecute(), 2529 p->return_oop()); 2530 } 2531 return NULL; 2532 } 2533 2534 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) { 2535 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2536 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2537 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2538 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2539 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2540 2541 if (has_method_handle_invokes()) 2542 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2543 2544 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2545 2546 if (block_begin == entry_point()) { 2547 methodHandle m = method(); 2548 if (m.not_null()) { 2549 stream->print(" # "); 2550 m->print_value_on(stream); 2551 stream->cr(); 2552 } 2553 if (m.not_null() && !is_osr_method()) { 2554 ResourceMark rm; 2555 int sizeargs = m->size_of_parameters(); 2556 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2557 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2558 { 2559 int sig_index = 0; 2560 if (!m->is_static()) 2561 sig_bt[sig_index++] = T_OBJECT; // 'this' 2562 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2563 BasicType t = ss.type(); 2564 sig_bt[sig_index++] = t; 2565 if (type2size[t] == 2) { 2566 sig_bt[sig_index++] = T_VOID; 2567 } else { 2568 assert(type2size[t] == 1, "size is 1 or 2"); 2569 } 2570 } 2571 assert(sig_index == sizeargs, ""); 2572 } 2573 const char* spname = "sp"; // make arch-specific? 2574 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2575 int stack_slot_offset = this->frame_size() * wordSize; 2576 int tab1 = 14, tab2 = 24; 2577 int sig_index = 0; 2578 int arg_index = (m->is_static() ? 0 : -1); 2579 bool did_old_sp = false; 2580 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2581 bool at_this = (arg_index == -1); 2582 bool at_old_sp = false; 2583 BasicType t = (at_this ? T_OBJECT : ss.type()); 2584 assert(t == sig_bt[sig_index], "sigs in sync"); 2585 if (at_this) 2586 stream->print(" # this: "); 2587 else 2588 stream->print(" # parm%d: ", arg_index); 2589 stream->move_to(tab1); 2590 VMReg fst = regs[sig_index].first(); 2591 VMReg snd = regs[sig_index].second(); 2592 if (fst->is_reg()) { 2593 stream->print("%s", fst->name()); 2594 if (snd->is_valid()) { 2595 stream->print(":%s", snd->name()); 2596 } 2597 } else if (fst->is_stack()) { 2598 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2599 if (offset == stack_slot_offset) at_old_sp = true; 2600 stream->print("[%s+0x%x]", spname, offset); 2601 } else { 2602 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2603 } 2604 stream->print(" "); 2605 stream->move_to(tab2); 2606 stream->print("= "); 2607 if (at_this) { 2608 m->method_holder()->print_value_on(stream); 2609 } else { 2610 bool did_name = false; 2611 if (!at_this && ss.is_object()) { 2612 Symbol* name = ss.as_symbol_or_null(); 2613 if (name != NULL) { 2614 name->print_value_on(stream); 2615 did_name = true; 2616 } 2617 } 2618 if (!did_name) 2619 stream->print("%s", type2name(t)); 2620 } 2621 if (at_old_sp) { 2622 stream->print(" (%s of caller)", spname); 2623 did_old_sp = true; 2624 } 2625 stream->cr(); 2626 sig_index += type2size[t]; 2627 arg_index += 1; 2628 if (!at_this) ss.next(); 2629 } 2630 if (!did_old_sp) { 2631 stream->print(" # "); 2632 stream->move_to(tab1); 2633 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2634 stream->print(" (%s of caller)", spname); 2635 stream->cr(); 2636 } 2637 } 2638 } 2639 } 2640 2641 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2642 // First, find an oopmap in (begin, end]. 2643 // We use the odd half-closed interval so that oop maps and scope descs 2644 // which are tied to the byte after a call are printed with the call itself. 2645 address base = code_begin(); 2646 OopMapSet* oms = oop_maps(); 2647 if (oms != NULL) { 2648 for (int i = 0, imax = oms->size(); i < imax; i++) { 2649 OopMap* om = oms->at(i); 2650 address pc = base + om->offset(); 2651 if (pc > begin) { 2652 if (pc <= end) { 2653 st->move_to(column); 2654 st->print("; "); 2655 om->print_on(st); 2656 } 2657 break; 2658 } 2659 } 2660 } 2661 2662 // Print any debug info present at this pc. 2663 ScopeDesc* sd = scope_desc_in(begin, end); 2664 if (sd != NULL) { 2665 st->move_to(column); 2666 if (sd->bci() == SynchronizationEntryBCI) { 2667 st->print(";*synchronization entry"); 2668 } else { 2669 if (sd->method().is_null()) { 2670 st->print("method is NULL"); 2671 } else if (sd->method()->is_native()) { 2672 st->print("method is native"); 2673 } else { 2674 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2675 st->print(";*%s", Bytecodes::name(bc)); 2676 switch (bc) { 2677 case Bytecodes::_invokevirtual: 2678 case Bytecodes::_invokespecial: 2679 case Bytecodes::_invokestatic: 2680 case Bytecodes::_invokeinterface: 2681 { 2682 Bytecode_invoke invoke(sd->method(), sd->bci()); 2683 st->print(" "); 2684 if (invoke.name() != NULL) 2685 invoke.name()->print_symbol_on(st); 2686 else 2687 st->print("<UNKNOWN>"); 2688 break; 2689 } 2690 case Bytecodes::_getfield: 2691 case Bytecodes::_putfield: 2692 case Bytecodes::_getstatic: 2693 case Bytecodes::_putstatic: 2694 { 2695 Bytecode_field field(sd->method(), sd->bci()); 2696 st->print(" "); 2697 if (field.name() != NULL) 2698 field.name()->print_symbol_on(st); 2699 else 2700 st->print("<UNKNOWN>"); 2701 } 2702 } 2703 } 2704 } 2705 2706 // Print all scopes 2707 for (;sd != NULL; sd = sd->sender()) { 2708 st->move_to(column); 2709 st->print("; -"); 2710 if (sd->method().is_null()) { 2711 st->print("method is NULL"); 2712 } else { 2713 sd->method()->print_short_name(st); 2714 } 2715 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2716 if (lineno != -1) { 2717 st->print("@%d (line %d)", sd->bci(), lineno); 2718 } else { 2719 st->print("@%d", sd->bci()); 2720 } 2721 st->cr(); 2722 } 2723 } 2724 2725 // Print relocation information 2726 const char* str = reloc_string_for(begin, end); 2727 if (str != NULL) { 2728 if (sd != NULL) st->cr(); 2729 st->move_to(column); 2730 st->print("; {%s}", str); 2731 } 2732 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2733 if (cont_offset != 0) { 2734 st->move_to(column); 2735 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 2736 } 2737 2738 } 2739 2740 #ifndef PRODUCT 2741 2742 void nmethod::print_value_on(outputStream* st) const { 2743 st->print("nmethod"); 2744 print_on(st, NULL); 2745 } 2746 2747 void nmethod::print_calls(outputStream* st) { 2748 RelocIterator iter(this); 2749 while (iter.next()) { 2750 switch (iter.type()) { 2751 case relocInfo::virtual_call_type: 2752 case relocInfo::opt_virtual_call_type: { 2753 VerifyMutexLocker mc(CompiledIC_lock); 2754 CompiledIC_at(iter.reloc())->print(); 2755 break; 2756 } 2757 case relocInfo::static_call_type: 2758 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 2759 compiledStaticCall_at(iter.reloc())->print(); 2760 break; 2761 } 2762 } 2763 } 2764 2765 void nmethod::print_handler_table() { 2766 ExceptionHandlerTable(this).print(); 2767 } 2768 2769 void nmethod::print_nul_chk_table() { 2770 ImplicitExceptionTable(this).print(code_begin()); 2771 } 2772 2773 void nmethod::print_statistics() { 2774 ttyLocker ttyl; 2775 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2776 nmethod_stats.print_native_nmethod_stats(); 2777 nmethod_stats.print_nmethod_stats(); 2778 DebugInformationRecorder::print_statistics(); 2779 nmethod_stats.print_pc_stats(); 2780 Dependencies::print_statistics(); 2781 if (xtty != NULL) xtty->tail("statistics"); 2782 } 2783 2784 #endif // PRODUCT