rev 1083 : code cache unloading for webrev 091214 rev 1084 : This rev fixes all the print format stuff and resets less counters as recommended by Vladimir.
1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 # include "incls/_precompiled.incl" 26 # include "incls/_nmethod.cpp.incl" 27 28 #ifdef DTRACE_ENABLED 29 30 // Only bother with this argument setup if dtrace is available 31 32 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, 33 const char*, int, const char*, int, const char*, int, void*, size_t); 34 35 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, 36 char*, int, char*, int, char*, int); 37 38 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 39 { \ 40 methodOop m = (method); \ 41 if (m != NULL) { \ 42 symbolOop klass_name = m->klass_name(); \ 43 symbolOop name = m->name(); \ 44 symbolOop signature = m->signature(); \ 45 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ 46 klass_name->bytes(), klass_name->utf8_length(), \ 47 name->bytes(), name->utf8_length(), \ 48 signature->bytes(), signature->utf8_length()); \ 49 } \ 50 } 51 52 #else // ndef DTRACE_ENABLED 53 54 #define DTRACE_METHOD_UNLOAD_PROBE(method) 55 56 #endif 57 58 bool nmethod::is_compiled_by_c1() const { 59 if (is_native_method()) return false; 60 assert(compiler() != NULL, "must be"); 61 return compiler()->is_c1(); 62 } 63 bool nmethod::is_compiled_by_c2() const { 64 if (is_native_method()) return false; 65 assert(compiler() != NULL, "must be"); 66 return compiler()->is_c2(); 67 } 68 69 70 71 //--------------------------------------------------------------------------------- 72 // NMethod statistics 73 // They are printed under various flags, including: 74 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 75 // (In the latter two cases, they like other stats are printed to the log only.) 76 77 #ifndef PRODUCT 78 // These variables are put into one block to reduce relocations 79 // and make it simpler to print from the debugger. 80 static 81 struct nmethod_stats_struct { 82 int nmethod_count; 83 int total_size; 84 int relocation_size; 85 int code_size; 86 int stub_size; 87 int consts_size; 88 int scopes_data_size; 89 int scopes_pcs_size; 90 int dependencies_size; 91 int handler_table_size; 92 int nul_chk_table_size; 93 int oops_size; 94 95 void note_nmethod(nmethod* nm) { 96 nmethod_count += 1; 97 total_size += nm->size(); 98 relocation_size += nm->relocation_size(); 99 code_size += nm->code_size(); 100 stub_size += nm->stub_size(); 101 consts_size += nm->consts_size(); 102 scopes_data_size += nm->scopes_data_size(); 103 scopes_pcs_size += nm->scopes_pcs_size(); 104 dependencies_size += nm->dependencies_size(); 105 handler_table_size += nm->handler_table_size(); 106 nul_chk_table_size += nm->nul_chk_table_size(); 107 oops_size += nm->oops_size(); 108 } 109 void print_nmethod_stats() { 110 if (nmethod_count == 0) return; 111 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 112 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 113 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 114 if (code_size != 0) tty->print_cr(" main code = %d", code_size); 115 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 116 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 117 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 118 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 119 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 120 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 121 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 122 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 123 } 124 125 int native_nmethod_count; 126 int native_total_size; 127 int native_relocation_size; 128 int native_code_size; 129 int native_oops_size; 130 void note_native_nmethod(nmethod* nm) { 131 native_nmethod_count += 1; 132 native_total_size += nm->size(); 133 native_relocation_size += nm->relocation_size(); 134 native_code_size += nm->code_size(); 135 native_oops_size += nm->oops_size(); 136 } 137 void print_native_nmethod_stats() { 138 if (native_nmethod_count == 0) return; 139 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 140 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 141 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 142 if (native_code_size != 0) tty->print_cr(" N. main code = %d", native_code_size); 143 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 144 } 145 146 int pc_desc_resets; // number of resets (= number of caches) 147 int pc_desc_queries; // queries to nmethod::find_pc_desc 148 int pc_desc_approx; // number of those which have approximate true 149 int pc_desc_repeats; // number of _last_pc_desc hits 150 int pc_desc_hits; // number of LRU cache hits 151 int pc_desc_tests; // total number of PcDesc examinations 152 int pc_desc_searches; // total number of quasi-binary search steps 153 int pc_desc_adds; // number of LUR cache insertions 154 155 void print_pc_stats() { 156 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 157 pc_desc_queries, 158 (double)(pc_desc_tests + pc_desc_searches) 159 / pc_desc_queries); 160 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 161 pc_desc_resets, 162 pc_desc_queries, pc_desc_approx, 163 pc_desc_repeats, pc_desc_hits, 164 pc_desc_tests, pc_desc_searches, pc_desc_adds); 165 } 166 } nmethod_stats; 167 #endif //PRODUCT 168 169 //--------------------------------------------------------------------------------- 170 171 172 // The _unwind_handler is a special marker address, which says that 173 // for given exception oop and address, the frame should be removed 174 // as the tuple cannot be caught in the nmethod 175 address ExceptionCache::_unwind_handler = (address) -1; 176 177 178 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 179 assert(pc != NULL, "Must be non null"); 180 assert(exception.not_null(), "Must be non null"); 181 assert(handler != NULL, "Must be non null"); 182 183 _count = 0; 184 _exception_type = exception->klass(); 185 _next = NULL; 186 187 add_address_and_handler(pc,handler); 188 } 189 190 191 address ExceptionCache::match(Handle exception, address pc) { 192 assert(pc != NULL,"Must be non null"); 193 assert(exception.not_null(),"Must be non null"); 194 if (exception->klass() == exception_type()) { 195 return (test_address(pc)); 196 } 197 198 return NULL; 199 } 200 201 202 bool ExceptionCache::match_exception_with_space(Handle exception) { 203 assert(exception.not_null(),"Must be non null"); 204 if (exception->klass() == exception_type() && count() < cache_size) { 205 return true; 206 } 207 return false; 208 } 209 210 211 address ExceptionCache::test_address(address addr) { 212 for (int i=0; i<count(); i++) { 213 if (pc_at(i) == addr) { 214 return handler_at(i); 215 } 216 } 217 return NULL; 218 } 219 220 221 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 222 if (test_address(addr) == handler) return true; 223 if (count() < cache_size) { 224 set_pc_at(count(),addr); 225 set_handler_at(count(), handler); 226 increment_count(); 227 return true; 228 } 229 return false; 230 } 231 232 233 // private method for handling exception cache 234 // These methods are private, and used to manipulate the exception cache 235 // directly. 236 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 237 ExceptionCache* ec = exception_cache(); 238 while (ec != NULL) { 239 if (ec->match_exception_with_space(exception)) { 240 return ec; 241 } 242 ec = ec->next(); 243 } 244 return NULL; 245 } 246 247 248 //----------------------------------------------------------------------------- 249 250 251 // Helper used by both find_pc_desc methods. 252 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 253 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 254 if (!approximate) 255 return pc->pc_offset() == pc_offset; 256 else 257 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 258 } 259 260 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 261 if (initial_pc_desc == NULL) { 262 _last_pc_desc = NULL; // native method 263 return; 264 } 265 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 266 // reset the cache by filling it with benign (non-null) values 267 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 268 _last_pc_desc = initial_pc_desc + 1; // first valid one is after sentinel 269 for (int i = 0; i < cache_size; i++) 270 _pc_descs[i] = initial_pc_desc; 271 } 272 273 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 274 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 275 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 276 277 // In order to prevent race conditions do not load cache elements 278 // repeatedly, but use a local copy: 279 PcDesc* res; 280 281 // Step one: Check the most recently returned value. 282 res = _last_pc_desc; 283 if (res == NULL) return NULL; // native method; no PcDescs at all 284 if (match_desc(res, pc_offset, approximate)) { 285 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 286 return res; 287 } 288 289 // Step two: Check the LRU cache. 290 for (int i = 0; i < cache_size; i++) { 291 res = _pc_descs[i]; 292 if (res->pc_offset() < 0) break; // optimization: skip empty cache 293 if (match_desc(res, pc_offset, approximate)) { 294 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 295 _last_pc_desc = res; // record this cache hit in case of repeat 296 return res; 297 } 298 } 299 300 // Report failure. 301 return NULL; 302 } 303 304 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 305 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 306 // Update the LRU cache by shifting pc_desc forward: 307 for (int i = 0; i < cache_size; i++) { 308 PcDesc* next = _pc_descs[i]; 309 _pc_descs[i] = pc_desc; 310 pc_desc = next; 311 } 312 // Note: Do not update _last_pc_desc. It fronts for the LRU cache. 313 } 314 315 // adjust pcs_size so that it is a multiple of both oopSize and 316 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 317 // of oopSize, then 2*sizeof(PcDesc) is) 318 static int adjust_pcs_size(int pcs_size) { 319 int nsize = round_to(pcs_size, oopSize); 320 if ((nsize % sizeof(PcDesc)) != 0) { 321 nsize = pcs_size + sizeof(PcDesc); 322 } 323 assert((nsize % oopSize) == 0, "correct alignment"); 324 return nsize; 325 } 326 327 //----------------------------------------------------------------------------- 328 329 330 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 331 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 332 assert(new_entry != NULL,"Must be non null"); 333 assert(new_entry->next() == NULL, "Must be null"); 334 335 if (exception_cache() != NULL) { 336 new_entry->set_next(exception_cache()); 337 } 338 set_exception_cache(new_entry); 339 } 340 341 void nmethod::remove_from_exception_cache(ExceptionCache* ec) { 342 ExceptionCache* prev = NULL; 343 ExceptionCache* curr = exception_cache(); 344 assert(curr != NULL, "nothing to remove"); 345 // find the previous and next entry of ec 346 while (curr != ec) { 347 prev = curr; 348 curr = curr->next(); 349 assert(curr != NULL, "ExceptionCache not found"); 350 } 351 // now: curr == ec 352 ExceptionCache* next = curr->next(); 353 if (prev == NULL) { 354 set_exception_cache(next); 355 } else { 356 prev->set_next(next); 357 } 358 delete curr; 359 } 360 361 362 // public method for accessing the exception cache 363 // These are the public access methods. 364 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 365 // We never grab a lock to read the exception cache, so we may 366 // have false negatives. This is okay, as it can only happen during 367 // the first few exception lookups for a given nmethod. 368 ExceptionCache* ec = exception_cache(); 369 while (ec != NULL) { 370 address ret_val; 371 if ((ret_val = ec->match(exception,pc)) != NULL) { 372 return ret_val; 373 } 374 ec = ec->next(); 375 } 376 return NULL; 377 } 378 379 380 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 381 // There are potential race conditions during exception cache updates, so we 382 // must own the ExceptionCache_lock before doing ANY modifications. Because 383 // we don't lock during reads, it is possible to have several threads attempt 384 // to update the cache with the same data. We need to check for already inserted 385 // copies of the current data before adding it. 386 387 MutexLocker ml(ExceptionCache_lock); 388 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 389 390 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 391 target_entry = new ExceptionCache(exception,pc,handler); 392 add_exception_cache_entry(target_entry); 393 } 394 } 395 396 397 //-------------end of code for ExceptionCache-------------- 398 399 400 void nmFlags::clear() { 401 assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags"); 402 *(jint*)this = 0; 403 } 404 405 int nmethod::total_size() const { 406 return 407 code_size() + 408 stub_size() + 409 consts_size() + 410 scopes_data_size() + 411 scopes_pcs_size() + 412 handler_table_size() + 413 nul_chk_table_size(); 414 } 415 416 const char* nmethod::compile_kind() const { 417 if (method() == NULL) return "unloaded"; 418 if (is_native_method()) return "c2n"; 419 if (is_osr_method()) return "osr"; 420 return NULL; 421 } 422 423 // %%% This variable is no longer used? 424 int nmethod::_zombie_instruction_size = NativeJump::instruction_size; 425 426 427 nmethod* nmethod::new_native_nmethod(methodHandle method, 428 CodeBuffer *code_buffer, 429 int vep_offset, 430 int frame_complete, 431 int frame_size, 432 ByteSize basic_lock_owner_sp_offset, 433 ByteSize basic_lock_sp_offset, 434 OopMapSet* oop_maps) { 435 // create nmethod 436 nmethod* nm = NULL; 437 { 438 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 439 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 440 CodeOffsets offsets; 441 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 442 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 443 nm = new (native_nmethod_size) 444 nmethod(method(), native_nmethod_size, &offsets, 445 code_buffer, frame_size, 446 basic_lock_owner_sp_offset, basic_lock_sp_offset, 447 oop_maps); 448 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 449 if (PrintAssembly && nm != NULL) 450 Disassembler::decode(nm); 451 } 452 // verify nmethod 453 debug_only(if (nm) nm->verify();) // might block 454 455 if (nm != NULL) { 456 nm->log_new_nmethod(); 457 } 458 459 return nm; 460 } 461 462 #ifdef HAVE_DTRACE_H 463 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 464 CodeBuffer *code_buffer, 465 int vep_offset, 466 int trap_offset, 467 int frame_complete, 468 int frame_size) { 469 // create nmethod 470 nmethod* nm = NULL; 471 { 472 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 473 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 474 CodeOffsets offsets; 475 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 476 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 477 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 478 479 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); 480 481 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 482 if (PrintAssembly && nm != NULL) 483 Disassembler::decode(nm); 484 } 485 // verify nmethod 486 debug_only(if (nm) nm->verify();) // might block 487 488 if (nm != NULL) { 489 nm->log_new_nmethod(); 490 } 491 492 return nm; 493 } 494 495 #endif // def HAVE_DTRACE_H 496 497 nmethod* nmethod::new_nmethod(methodHandle method, 498 int compile_id, 499 int entry_bci, 500 CodeOffsets* offsets, 501 int orig_pc_offset, 502 DebugInformationRecorder* debug_info, 503 Dependencies* dependencies, 504 CodeBuffer* code_buffer, int frame_size, 505 OopMapSet* oop_maps, 506 ExceptionHandlerTable* handler_table, 507 ImplicitExceptionTable* nul_chk_table, 508 AbstractCompiler* compiler, 509 int comp_level 510 ) 511 { 512 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 513 // create nmethod 514 nmethod* nm = NULL; 515 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 516 int nmethod_size = 517 allocation_size(code_buffer, sizeof(nmethod)) 518 + adjust_pcs_size(debug_info->pcs_size()) 519 + round_to(dependencies->size_in_bytes() , oopSize) 520 + round_to(handler_table->size_in_bytes(), oopSize) 521 + round_to(nul_chk_table->size_in_bytes(), oopSize) 522 + round_to(debug_info->data_size() , oopSize); 523 nm = new (nmethod_size) 524 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 525 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 526 oop_maps, 527 handler_table, 528 nul_chk_table, 529 compiler, 530 comp_level); 531 if (nm != NULL) { 532 // To make dependency checking during class loading fast, record 533 // the nmethod dependencies in the classes it is dependent on. 534 // This allows the dependency checking code to simply walk the 535 // class hierarchy above the loaded class, checking only nmethods 536 // which are dependent on those classes. The slow way is to 537 // check every nmethod for dependencies which makes it linear in 538 // the number of methods compiled. For applications with a lot 539 // classes the slow way is too slow. 540 for (Dependencies::DepStream deps(nm); deps.next(); ) { 541 klassOop klass = deps.context_type(); 542 if (klass == NULL) continue; // ignore things like evol_method 543 544 // record this nmethod as dependent on this klass 545 instanceKlass::cast(klass)->add_dependent_nmethod(nm); 546 } 547 } 548 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 549 if (PrintAssembly && nm != NULL) 550 Disassembler::decode(nm); 551 } 552 553 // verify nmethod 554 debug_only(if (nm) nm->verify();) // might block 555 556 if (nm != NULL) { 557 nm->log_new_nmethod(); 558 } 559 560 // done 561 return nm; 562 } 563 564 565 // For native wrappers 566 nmethod::nmethod( 567 methodOop method, 568 int nmethod_size, 569 CodeOffsets* offsets, 570 CodeBuffer* code_buffer, 571 int frame_size, 572 ByteSize basic_lock_owner_sp_offset, 573 ByteSize basic_lock_sp_offset, 574 OopMapSet* oop_maps ) 575 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 576 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 577 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset), 578 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset) 579 { 580 { 581 debug_only(No_Safepoint_Verifier nsv;) 582 assert_locked_or_safepoint(CodeCache_lock); 583 584 NOT_PRODUCT(_has_debug_info = false); 585 _oops_do_mark_link = NULL; 586 _method = method; 587 _entry_bci = InvocationEntryBci; 588 _osr_link = NULL; 589 _scavenge_root_link = NULL; 590 _scavenge_root_state = 0; 591 _compiler = NULL; 592 // We have no exception handler or deopt handler make the 593 // values something that will never match a pc like the nmethod vtable entry 594 _exception_offset = 0; 595 _deoptimize_offset = 0; 596 _orig_pc_offset = 0; 597 #ifdef HAVE_DTRACE_H 598 _trap_offset = 0; 599 #endif // def HAVE_DTRACE_H 600 _stub_offset = data_offset(); 601 _consts_offset = data_offset(); 602 _scopes_data_offset = data_offset(); 603 _scopes_pcs_offset = _scopes_data_offset; 604 _dependencies_offset = _scopes_pcs_offset; 605 _handler_table_offset = _dependencies_offset; 606 _nul_chk_table_offset = _handler_table_offset; 607 _nmethod_end_offset = _nul_chk_table_offset; 608 _compile_id = 0; // default 609 _comp_level = CompLevel_none; 610 _entry_point = instructions_begin(); 611 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); 612 _osr_entry_point = NULL; 613 _exception_cache = NULL; 614 _pc_desc_cache.reset_to(NULL); 615 616 flags.clear(); 617 flags.state = alive; 618 _markedForDeoptimization = 0; 619 620 _lock_count = 0; 621 _stack_traversal_mark = 0; 622 623 code_buffer->copy_oops_to(this); 624 debug_only(verify_scavenge_root_oops()); 625 CodeCache::commit(this); 626 VTune::create_nmethod(this); 627 } 628 629 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 630 ttyLocker ttyl; // keep the following output all in one block 631 // This output goes directly to the tty, not the compiler log. 632 // To enable tools to match it up with the compilation activity, 633 // be sure to tag this tty output with the compile ID. 634 if (xtty != NULL) { 635 xtty->begin_head("print_native_nmethod"); 636 xtty->method(_method); 637 xtty->stamp(); 638 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 639 } 640 // print the header part first 641 print(); 642 // then print the requested information 643 if (PrintNativeNMethods) { 644 print_code(); 645 oop_maps->print(); 646 } 647 if (PrintRelocations) { 648 print_relocations(); 649 } 650 if (xtty != NULL) { 651 xtty->tail("print_native_nmethod"); 652 } 653 } 654 Events::log("Create nmethod " INTPTR_FORMAT, this); 655 } 656 657 // For dtrace wrappers 658 #ifdef HAVE_DTRACE_H 659 nmethod::nmethod( 660 methodOop method, 661 int nmethod_size, 662 CodeOffsets* offsets, 663 CodeBuffer* code_buffer, 664 int frame_size) 665 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 666 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 667 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), 668 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) 669 { 670 { 671 debug_only(No_Safepoint_Verifier nsv;) 672 assert_locked_or_safepoint(CodeCache_lock); 673 674 NOT_PRODUCT(_has_debug_info = false); 675 _oops_do_mark_link = NULL; 676 _method = method; 677 _entry_bci = InvocationEntryBci; 678 _osr_link = NULL; 679 _scavenge_root_link = NULL; 680 _scavenge_root_state = 0; 681 _compiler = NULL; 682 // We have no exception handler or deopt handler make the 683 // values something that will never match a pc like the nmethod vtable entry 684 _exception_offset = 0; 685 _deoptimize_offset = 0; 686 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 687 _orig_pc_offset = 0; 688 _stub_offset = data_offset(); 689 _consts_offset = data_offset(); 690 _scopes_data_offset = data_offset(); 691 _scopes_pcs_offset = _scopes_data_offset; 692 _dependencies_offset = _scopes_pcs_offset; 693 _handler_table_offset = _dependencies_offset; 694 _nul_chk_table_offset = _handler_table_offset; 695 _nmethod_end_offset = _nul_chk_table_offset; 696 _compile_id = 0; // default 697 _comp_level = CompLevel_none; 698 _entry_point = instructions_begin(); 699 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); 700 _osr_entry_point = NULL; 701 _exception_cache = NULL; 702 _pc_desc_cache.reset_to(NULL); 703 704 flags.clear(); 705 flags.state = alive; 706 _markedForDeoptimization = 0; 707 708 _lock_count = 0; 709 _stack_traversal_mark = 0; 710 711 code_buffer->copy_oops_to(this); 712 debug_only(verify_scavenge_root_oops()); 713 CodeCache::commit(this); 714 VTune::create_nmethod(this); 715 } 716 717 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 718 ttyLocker ttyl; // keep the following output all in one block 719 // This output goes directly to the tty, not the compiler log. 720 // To enable tools to match it up with the compilation activity, 721 // be sure to tag this tty output with the compile ID. 722 if (xtty != NULL) { 723 xtty->begin_head("print_dtrace_nmethod"); 724 xtty->method(_method); 725 xtty->stamp(); 726 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 727 } 728 // print the header part first 729 print(); 730 // then print the requested information 731 if (PrintNMethods) { 732 print_code(); 733 } 734 if (PrintRelocations) { 735 print_relocations(); 736 } 737 if (xtty != NULL) { 738 xtty->tail("print_dtrace_nmethod"); 739 } 740 } 741 Events::log("Create nmethod " INTPTR_FORMAT, this); 742 } 743 #endif // def HAVE_DTRACE_H 744 745 void* nmethod::operator new(size_t size, int nmethod_size) { 746 // Always leave some room in the CodeCache for I2C/C2I adapters 747 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL; 748 return CodeCache::allocate(nmethod_size); 749 } 750 751 752 nmethod::nmethod( 753 methodOop method, 754 int nmethod_size, 755 int compile_id, 756 int entry_bci, 757 CodeOffsets* offsets, 758 int orig_pc_offset, 759 DebugInformationRecorder* debug_info, 760 Dependencies* dependencies, 761 CodeBuffer *code_buffer, 762 int frame_size, 763 OopMapSet* oop_maps, 764 ExceptionHandlerTable* handler_table, 765 ImplicitExceptionTable* nul_chk_table, 766 AbstractCompiler* compiler, 767 int comp_level 768 ) 769 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 770 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 771 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), 772 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) 773 { 774 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 775 { 776 debug_only(No_Safepoint_Verifier nsv;) 777 assert_locked_or_safepoint(CodeCache_lock); 778 779 NOT_PRODUCT(_has_debug_info = false); 780 _oops_do_mark_link = NULL; 781 _method = method; 782 _compile_id = compile_id; 783 _comp_level = comp_level; 784 _entry_bci = entry_bci; 785 _osr_link = NULL; 786 _scavenge_root_link = NULL; 787 _scavenge_root_state = 0; 788 _compiler = compiler; 789 _orig_pc_offset = orig_pc_offset; 790 #ifdef HAVE_DTRACE_H 791 _trap_offset = 0; 792 #endif // def HAVE_DTRACE_H 793 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start()); 794 795 // Exception handler and deopt handler are in the stub section 796 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 797 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 798 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start()); 799 _scopes_data_offset = data_offset(); 800 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 801 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 802 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 803 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 804 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 805 806 _entry_point = instructions_begin(); 807 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); 808 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry); 809 _exception_cache = NULL; 810 _pc_desc_cache.reset_to(scopes_pcs_begin()); 811 812 flags.clear(); 813 flags.state = alive; 814 _markedForDeoptimization = 0; 815 816 _unload_reported = false; // jvmti state 817 818 _lock_count = 0; 819 _stack_traversal_mark = 0; 820 821 // Copy contents of ScopeDescRecorder to nmethod 822 code_buffer->copy_oops_to(this); 823 debug_info->copy_to(this); 824 dependencies->copy_to(this); 825 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 826 CodeCache::add_scavenge_root_nmethod(this); 827 } 828 debug_only(verify_scavenge_root_oops()); 829 830 CodeCache::commit(this); 831 832 VTune::create_nmethod(this); 833 834 // Copy contents of ExceptionHandlerTable to nmethod 835 handler_table->copy_to(this); 836 nul_chk_table->copy_to(this); 837 838 // we use the information of entry points to find out if a method is 839 // static or non static 840 assert(compiler->is_c2() || 841 _method->is_static() == (entry_point() == _verified_entry_point), 842 " entry points must be same for static methods and vice versa"); 843 } 844 845 bool printnmethods = PrintNMethods 846 || CompilerOracle::should_print(_method) 847 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 848 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 849 print_nmethod(printnmethods); 850 } 851 852 // Note: Do not verify in here as the CodeCache_lock is 853 // taken which would conflict with the CompiledIC_lock 854 // which taken during the verification of call sites. 855 // (was bug - gri 10/25/99) 856 857 Events::log("Create nmethod " INTPTR_FORMAT, this); 858 } 859 860 861 // Print a short set of xml attributes to identify this nmethod. The 862 // output should be embedded in some other element. 863 void nmethod::log_identity(xmlStream* log) const { 864 log->print(" compile_id='%d'", compile_id()); 865 const char* nm_kind = compile_kind(); 866 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 867 if (compiler() != NULL) { 868 log->print(" compiler='%s'", compiler()->name()); 869 } 870 #ifdef TIERED 871 log->print(" level='%d'", comp_level()); 872 #endif // TIERED 873 } 874 875 876 #define LOG_OFFSET(log, name) \ 877 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 878 log->print(" " XSTR(name) "_offset='%d'" , \ 879 (intptr_t)name##_begin() - (intptr_t)this) 880 881 882 void nmethod::log_new_nmethod() const { 883 if (LogCompilation && xtty != NULL) { 884 ttyLocker ttyl; 885 HandleMark hm; 886 xtty->begin_elem("nmethod"); 887 log_identity(xtty); 888 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", 889 instructions_begin(), size()); 890 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 891 892 LOG_OFFSET(xtty, relocation); 893 LOG_OFFSET(xtty, code); 894 LOG_OFFSET(xtty, stub); 895 LOG_OFFSET(xtty, consts); 896 LOG_OFFSET(xtty, scopes_data); 897 LOG_OFFSET(xtty, scopes_pcs); 898 LOG_OFFSET(xtty, dependencies); 899 LOG_OFFSET(xtty, handler_table); 900 LOG_OFFSET(xtty, nul_chk_table); 901 LOG_OFFSET(xtty, oops); 902 903 xtty->method(method()); 904 xtty->stamp(); 905 xtty->end_elem(); 906 } 907 } 908 909 #undef LOG_OFFSET 910 911 912 // Print out more verbose output usually for a newly created nmethod. 913 void nmethod::print_on(outputStream* st, const char* title) const { 914 if (st != NULL) { 915 ttyLocker ttyl; 916 // Print a little tag line that looks like +PrintCompilation output: 917 int tlen = (int) strlen(title); 918 bool do_nl = false; 919 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; } 920 st->print("%3d%c %.*s", 921 compile_id(), 922 is_osr_method() ? '%' : 923 method() != NULL && 924 is_native_method() ? 'n' : ' ', 925 tlen, title); 926 #ifdef TIERED 927 st->print(" (%d) ", comp_level()); 928 #endif // TIERED 929 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); 930 if (Universe::heap()->is_gc_active() && method() != NULL) { 931 st->print("(method)"); 932 } else if (method() != NULL) { 933 method()->print_short_name(st); 934 if (is_osr_method()) 935 st->print(" @ %d", osr_entry_bci()); 936 if (method()->code_size() > 0) 937 st->print(" (%d bytes)", method()->code_size()); 938 } 939 940 if (do_nl) st->cr(); 941 } 942 } 943 944 945 void nmethod::print_nmethod(bool printmethod) { 946 ttyLocker ttyl; // keep the following output all in one block 947 if (xtty != NULL) { 948 xtty->begin_head("print_nmethod"); 949 xtty->stamp(); 950 xtty->end_head(); 951 } 952 // print the header part first 953 print(); 954 // then print the requested information 955 if (printmethod) { 956 print_code(); 957 print_pcs(); 958 oop_maps()->print(); 959 } 960 if (PrintDebugInfo) { 961 print_scopes(); 962 } 963 if (PrintRelocations) { 964 print_relocations(); 965 } 966 if (PrintDependencies) { 967 print_dependencies(); 968 } 969 if (PrintExceptionHandlers) { 970 print_handler_table(); 971 print_nul_chk_table(); 972 } 973 if (xtty != NULL) { 974 xtty->tail("print_nmethod"); 975 } 976 } 977 978 979 void nmethod::set_version(int v) { 980 flags.version = v; 981 } 982 983 984 ScopeDesc* nmethod::scope_desc_at(address pc) { 985 PcDesc* pd = pc_desc_at(pc); 986 guarantee(pd != NULL, "scope must be present"); 987 return new ScopeDesc(this, pd->scope_decode_offset(), 988 pd->obj_decode_offset(), pd->should_reexecute()); 989 } 990 991 992 void nmethod::clear_inline_caches() { 993 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 994 if (is_zombie()) { 995 return; 996 } 997 998 RelocIterator iter(this); 999 while (iter.next()) { 1000 iter.reloc()->clear_inline_cache(); 1001 } 1002 } 1003 1004 1005 void nmethod::cleanup_inline_caches() { 1006 1007 assert(SafepointSynchronize::is_at_safepoint() && 1008 !CompiledIC_lock->is_locked() && 1009 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs"); 1010 1011 // If the method is not entrant or zombie then a JMP is plastered over the 1012 // first few bytes. If an oop in the old code was there, that oop 1013 // should not get GC'd. Skip the first few bytes of oops on 1014 // not-entrant methods. 1015 address low_boundary = verified_entry_point(); 1016 if (!is_in_use()) { 1017 low_boundary += NativeJump::instruction_size; 1018 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1019 // This means that the low_boundary is going to be a little too high. 1020 // This shouldn't matter, since oops of non-entrant methods are never used. 1021 // In fact, why are we bothering to look at oops in a non-entrant method?? 1022 } 1023 1024 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1025 ResourceMark rm; 1026 RelocIterator iter(this, low_boundary); 1027 while(iter.next()) { 1028 switch(iter.type()) { 1029 case relocInfo::virtual_call_type: 1030 case relocInfo::opt_virtual_call_type: { 1031 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1032 // Ok, to lookup references to zombies here 1033 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1034 if( cb != NULL && cb->is_nmethod() ) { 1035 nmethod* nm = (nmethod*)cb; 1036 // Clean inline caches pointing to both zombie and not_entrant methods 1037 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1038 } 1039 break; 1040 } 1041 case relocInfo::static_call_type: { 1042 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1043 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1044 if( cb != NULL && cb->is_nmethod() ) { 1045 nmethod* nm = (nmethod*)cb; 1046 // Clean inline caches pointing to both zombie and not_entrant methods 1047 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1048 } 1049 break; 1050 } 1051 } 1052 } 1053 } 1054 1055 // This is a private interface with the sweeper. 1056 void nmethod::mark_as_seen_on_stack() { 1057 assert(is_not_entrant(), "must be a non-entrant method"); 1058 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1059 } 1060 1061 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack) 1062 bool nmethod::can_not_entrant_be_converted() { 1063 assert(is_not_entrant(), "must be a non-entrant method"); 1064 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint"); 1065 1066 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1067 // count can be greater than the stack traversal count before it hits the 1068 // nmethod for the second time. 1069 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count(); 1070 } 1071 1072 void nmethod::inc_decompile_count() { 1073 // Could be gated by ProfileTraps, but do not bother... 1074 methodOop m = method(); 1075 if (m == NULL) return; 1076 methodDataOop mdo = m->method_data(); 1077 if (mdo == NULL) return; 1078 // There is a benign race here. See comments in methodDataOop.hpp. 1079 mdo->inc_decompile_count(); 1080 } 1081 1082 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1083 1084 post_compiled_method_unload(); 1085 1086 // Since this nmethod is being unloaded, make sure that dependencies 1087 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1088 // indicate that this work is being done during a GC. 1089 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1090 assert(is_alive != NULL, "Should be non-NULL"); 1091 // A non-NULL is_alive closure indicates that this is being called during GC. 1092 flush_dependencies(is_alive); 1093 1094 // Break cycle between nmethod & method 1095 if (TraceClassUnloading && WizardMode) { 1096 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1097 " unloadable], methodOop(" INTPTR_FORMAT 1098 "), cause(" INTPTR_FORMAT ")", 1099 this, (address)_method, (address)cause); 1100 if (!Universe::heap()->is_gc_active()) 1101 cause->klass()->print(); 1102 } 1103 // Unlink the osr method, so we do not look this up again 1104 if (is_osr_method()) { 1105 invalidate_osr_method(); 1106 } 1107 // If _method is already NULL the methodOop is about to be unloaded, 1108 // so we don't have to break the cycle. Note that it is possible to 1109 // have the methodOop live here, in case we unload the nmethod because 1110 // it is pointing to some oop (other than the methodOop) being unloaded. 1111 if (_method != NULL) { 1112 // OSR methods point to the methodOop, but the methodOop does not 1113 // point back! 1114 if (_method->code() == this) { 1115 _method->clear_code(); // Break a cycle 1116 } 1117 inc_decompile_count(); // Last chance to make a mark on the MDO 1118 _method = NULL; // Clear the method of this dead nmethod 1119 } 1120 // Make the class unloaded - i.e., change state and notify sweeper 1121 check_safepoint(); 1122 if (is_in_use()) { 1123 // Transitioning directly from live to unloaded -- so 1124 // we need to force a cache clean-up; remember this 1125 // for later on. 1126 CodeCache::set_needs_cache_clean(true); 1127 } 1128 flags.state = unloaded; 1129 1130 // The methodOop is gone at this point 1131 assert(_method == NULL, "Tautology"); 1132 1133 set_osr_link(NULL); 1134 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1135 NMethodSweeper::notify(this); 1136 } 1137 1138 void nmethod::invalidate_osr_method() { 1139 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1140 if (_entry_bci != InvalidOSREntryBci) 1141 inc_decompile_count(); 1142 // Remove from list of active nmethods 1143 if (method() != NULL) 1144 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); 1145 // Set entry as invalid 1146 _entry_bci = InvalidOSREntryBci; 1147 } 1148 1149 void nmethod::log_state_change(int state) const { 1150 if (LogCompilation) { 1151 if (xtty != NULL) { 1152 ttyLocker ttyl; // keep the following output all in one block 1153 xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'", 1154 (state == zombie ? "zombie='1' " : ""), 1155 os::current_thread_id()); 1156 log_identity(xtty); 1157 xtty->stamp(); 1158 xtty->end_elem(); 1159 } 1160 } 1161 if (PrintCompilation) { 1162 print_on(tty, state == zombie ? "made zombie " : "made not entrant "); 1163 tty->cr(); 1164 } 1165 } 1166 1167 // Common functionality for both make_not_entrant and make_zombie 1168 void nmethod::make_not_entrant_or_zombie(int state) { 1169 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1170 1171 // Code for an on-stack-replacement nmethod is removed when a class gets unloaded. 1172 // They never become zombie/non-entrant, so the nmethod sweeper will never remove 1173 // them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod 1174 // will never be used anymore. That the nmethods only gets removed when class unloading 1175 // happens, make life much simpler, since the nmethods are not just going to disappear 1176 // out of the blue. 1177 if (is_osr_method()) { 1178 if (osr_entry_bci() != InvalidOSREntryBci) { 1179 // only log this once 1180 log_state_change(state); 1181 } 1182 invalidate_osr_method(); 1183 return; 1184 } 1185 1186 // If the method is already zombie or set to the state we want, nothing to do 1187 if (is_zombie() || (state == not_entrant && is_not_entrant())) { 1188 return; 1189 } 1190 1191 log_state_change(state); 1192 1193 // Make sure the nmethod is not flushed in case of a safepoint in code below. 1194 nmethodLocker nml(this); 1195 1196 { 1197 // Enter critical section. Does not block for safepoint. 1198 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1199 // The caller can be calling the method statically or through an inline 1200 // cache call. 1201 if (!is_not_entrant()) { 1202 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1203 SharedRuntime::get_handle_wrong_method_stub()); 1204 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, ""); 1205 } 1206 1207 // When the nmethod becomes zombie it is no longer alive so the 1208 // dependencies must be flushed. nmethods in the not_entrant 1209 // state will be flushed later when the transition to zombie 1210 // happens or they get unloaded. 1211 if (state == zombie) { 1212 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); 1213 flush_dependencies(NULL); 1214 } else { 1215 assert(state == not_entrant, "other cases may need to be handled differently"); 1216 } 1217 1218 // Change state 1219 flags.state = state; 1220 } // leave critical region under Patching_lock 1221 1222 if (state == not_entrant) { 1223 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this); 1224 } else { 1225 Events::log("Make nmethod zombie " INTPTR_FORMAT, this); 1226 } 1227 1228 if (TraceCreateZombies) { 1229 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1230 } 1231 1232 // Make sweeper aware that there is a zombie method that needs to be removed 1233 NMethodSweeper::notify(this); 1234 1235 // not_entrant only stuff 1236 if (state == not_entrant) { 1237 mark_as_seen_on_stack(); 1238 } 1239 1240 // It's a true state change, so mark the method as decompiled. 1241 inc_decompile_count(); 1242 1243 1244 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event 1245 // and it hasn't already been reported for this nmethod then report it now. 1246 // (the event may have been reported earilier if the GC marked it for unloading). 1247 if (state == zombie) { 1248 1249 DTRACE_METHOD_UNLOAD_PROBE(method()); 1250 1251 if (JvmtiExport::should_post_compiled_method_unload() && 1252 !unload_reported()) { 1253 assert(method() != NULL, "checking"); 1254 { 1255 HandleMark hm; 1256 JvmtiExport::post_compiled_method_unload_at_safepoint( 1257 method()->jmethod_id(), code_begin()); 1258 } 1259 set_unload_reported(); 1260 } 1261 } 1262 1263 1264 // Zombie only stuff 1265 if (state == zombie) { 1266 VTune::delete_nmethod(this); 1267 } 1268 1269 // Check whether method got unloaded at a safepoint before this, 1270 // if so we can skip the flushing steps below 1271 if (method() == NULL) return; 1272 1273 // Remove nmethod from method. 1274 // We need to check if both the _code and _from_compiled_code_entry_point 1275 // refer to this nmethod because there is a race in setting these two fields 1276 // in methodOop as seen in bugid 4947125. 1277 // If the vep() points to the zombie nmethod, the memory for the nmethod 1278 // could be flushed and the compiler and vtable stubs could still call 1279 // through it. 1280 if (method()->code() == this || 1281 method()->from_compiled_entry() == verified_entry_point()) { 1282 HandleMark hm; 1283 method()->clear_code(); 1284 } 1285 } 1286 1287 1288 #ifndef PRODUCT 1289 void nmethod::check_safepoint() { 1290 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1291 } 1292 #endif 1293 1294 1295 void nmethod::flush() { 1296 // Note that there are no valid oops in the nmethod anymore. 1297 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1298 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1299 1300 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1301 check_safepoint(); 1302 1303 // completely deallocate this method 1304 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); 1305 if (PrintMethodFlushing) { 1306 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". " UINT32_FORMAT "/" SIZE_FORMAT "/" SIZE_FORMAT, 1307 this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity(), CodeCache::max_capacity()); 1308 } 1309 1310 // We need to deallocate any ExceptionCache data. 1311 // Note that we do not need to grab the nmethod lock for this, it 1312 // better be thread safe if we're disposing of it! 1313 ExceptionCache* ec = exception_cache(); 1314 set_exception_cache(NULL); 1315 while(ec != NULL) { 1316 ExceptionCache* next = ec->next(); 1317 delete ec; 1318 ec = next; 1319 } 1320 1321 if (on_scavenge_root_list()) { 1322 CodeCache::drop_scavenge_root_nmethod(this); 1323 } 1324 1325 ((CodeBlob*)(this))->flush(); 1326 1327 CodeCache::free(this); 1328 } 1329 1330 1331 // 1332 // Notify all classes this nmethod is dependent on that it is no 1333 // longer dependent. This should only be called in two situations. 1334 // First, when a nmethod transitions to a zombie all dependents need 1335 // to be clear. Since zombification happens at a safepoint there's no 1336 // synchronization issues. The second place is a little more tricky. 1337 // During phase 1 of mark sweep class unloading may happen and as a 1338 // result some nmethods may get unloaded. In this case the flushing 1339 // of dependencies must happen during phase 1 since after GC any 1340 // dependencies in the unloaded nmethod won't be updated, so 1341 // traversing the dependency information in unsafe. In that case this 1342 // function is called with a non-NULL argument and this function only 1343 // notifies instanceKlasses that are reachable 1344 1345 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1346 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); 1347 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1348 "is_alive is non-NULL if and only if we are called during GC"); 1349 if (!has_flushed_dependencies()) { 1350 set_has_flushed_dependencies(); 1351 for (Dependencies::DepStream deps(this); deps.next(); ) { 1352 klassOop klass = deps.context_type(); 1353 if (klass == NULL) continue; // ignore things like evol_method 1354 1355 // During GC the is_alive closure is non-NULL, and is used to 1356 // determine liveness of dependees that need to be updated. 1357 if (is_alive == NULL || is_alive->do_object_b(klass)) { 1358 instanceKlass::cast(klass)->remove_dependent_nmethod(this); 1359 } 1360 } 1361 } 1362 } 1363 1364 1365 // If this oop is not live, the nmethod can be unloaded. 1366 bool nmethod::can_unload(BoolObjectClosure* is_alive, 1367 OopClosure* keep_alive, 1368 oop* root, bool unloading_occurred) { 1369 assert(root != NULL, "just checking"); 1370 oop obj = *root; 1371 if (obj == NULL || is_alive->do_object_b(obj)) { 1372 return false; 1373 } 1374 if (obj->is_compiledICHolder()) { 1375 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); 1376 if (is_alive->do_object_b( 1377 cichk_oop->holder_method()->method_holder()) && 1378 is_alive->do_object_b(cichk_oop->holder_klass())) { 1379 // The oop should be kept alive 1380 keep_alive->do_oop(root); 1381 return false; 1382 } 1383 } 1384 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1385 // simply because one of its constant oops has gone dead. 1386 // No actual classes need to be unloaded in order for this to occur. 1387 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1388 make_unloaded(is_alive, obj); 1389 return true; 1390 } 1391 1392 // ------------------------------------------------------------------ 1393 // post_compiled_method_load_event 1394 // new method for install_code() path 1395 // Transfer information from compilation to jvmti 1396 void nmethod::post_compiled_method_load_event() { 1397 1398 methodOop moop = method(); 1399 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1400 moop->klass_name()->bytes(), 1401 moop->klass_name()->utf8_length(), 1402 moop->name()->bytes(), 1403 moop->name()->utf8_length(), 1404 moop->signature()->bytes(), 1405 moop->signature()->utf8_length(), 1406 code_begin(), code_size()); 1407 1408 if (JvmtiExport::should_post_compiled_method_load()) { 1409 JvmtiExport::post_compiled_method_load(this); 1410 } 1411 } 1412 1413 void nmethod::post_compiled_method_unload() { 1414 assert(_method != NULL && !is_unloaded(), "just checking"); 1415 DTRACE_METHOD_UNLOAD_PROBE(method()); 1416 1417 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1418 // post the event. Sometime later this nmethod will be made a zombie by 1419 // the sweeper but the methodOop will not be valid at that point. 1420 if (JvmtiExport::should_post_compiled_method_unload()) { 1421 assert(!unload_reported(), "already unloaded"); 1422 HandleMark hm; 1423 JvmtiExport::post_compiled_method_unload_at_safepoint( 1424 method()->jmethod_id(), code_begin()); 1425 } 1426 1427 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1428 // any time. As the nmethod is being unloaded now we mark it has 1429 // having the unload event reported - this will ensure that we don't 1430 // attempt to report the event in the unlikely scenario where the 1431 // event is enabled at the time the nmethod is made a zombie. 1432 set_unload_reported(); 1433 } 1434 1435 // This is called at the end of the strong tracing/marking phase of a 1436 // GC to unload an nmethod if it contains otherwise unreachable 1437 // oops. 1438 1439 void nmethod::do_unloading(BoolObjectClosure* is_alive, 1440 OopClosure* keep_alive, bool unloading_occurred) { 1441 // Make sure the oop's ready to receive visitors 1442 assert(!is_zombie() && !is_unloaded(), 1443 "should not call follow on zombie or unloaded nmethod"); 1444 1445 // If the method is not entrant then a JMP is plastered over the 1446 // first few bytes. If an oop in the old code was there, that oop 1447 // should not get GC'd. Skip the first few bytes of oops on 1448 // not-entrant methods. 1449 address low_boundary = verified_entry_point(); 1450 if (is_not_entrant()) { 1451 low_boundary += NativeJump::instruction_size; 1452 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1453 // (See comment above.) 1454 } 1455 1456 // The RedefineClasses() API can cause the class unloading invariant 1457 // to no longer be true. See jvmtiExport.hpp for details. 1458 // Also, leave a debugging breadcrumb in local flag. 1459 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1460 if (a_class_was_redefined) { 1461 // This set of the unloading_occurred flag is done before the 1462 // call to post_compiled_method_unload() so that the unloading 1463 // of this nmethod is reported. 1464 unloading_occurred = true; 1465 } 1466 1467 // Follow methodOop 1468 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { 1469 return; 1470 } 1471 1472 // Exception cache 1473 ExceptionCache* ec = exception_cache(); 1474 while (ec != NULL) { 1475 oop* ex_addr = (oop*)ec->exception_type_addr(); 1476 oop ex = *ex_addr; 1477 ExceptionCache* next_ec = ec->next(); 1478 if (ex != NULL && !is_alive->do_object_b(ex)) { 1479 assert(!ex->is_compiledICHolder(), "Possible error here"); 1480 remove_from_exception_cache(ec); 1481 } 1482 ec = next_ec; 1483 } 1484 1485 // If class unloading occurred we first iterate over all inline caches and 1486 // clear ICs where the cached oop is referring to an unloaded klass or method. 1487 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1488 // iteration below. 1489 if (unloading_occurred) { 1490 RelocIterator iter(this, low_boundary); 1491 while(iter.next()) { 1492 if (iter.type() == relocInfo::virtual_call_type) { 1493 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1494 oop ic_oop = ic->cached_oop(); 1495 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { 1496 // The only exception is compiledICHolder oops which may 1497 // yet be marked below. (We check this further below). 1498 if (ic_oop->is_compiledICHolder()) { 1499 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); 1500 if (is_alive->do_object_b( 1501 cichk_oop->holder_method()->method_holder()) && 1502 is_alive->do_object_b(cichk_oop->holder_klass())) { 1503 continue; 1504 } 1505 } 1506 ic->set_to_clean(); 1507 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared") 1508 } 1509 } 1510 } 1511 } 1512 1513 // Compiled code 1514 RelocIterator iter(this, low_boundary); 1515 while (iter.next()) { 1516 if (iter.type() == relocInfo::oop_type) { 1517 oop_Relocation* r = iter.oop_reloc(); 1518 // In this loop, we must only traverse those oops directly embedded in 1519 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1520 assert(1 == (r->oop_is_immediate()) + 1521 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1522 "oop must be found in exactly one place"); 1523 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1524 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { 1525 return; 1526 } 1527 } 1528 } 1529 } 1530 1531 1532 // Scopes 1533 for (oop* p = oops_begin(); p < oops_end(); p++) { 1534 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1535 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { 1536 return; 1537 } 1538 } 1539 1540 #ifndef PRODUCT 1541 // This nmethod was not unloaded; check below that all CompiledICs 1542 // refer to marked oops. 1543 { 1544 RelocIterator iter(this, low_boundary); 1545 while (iter.next()) { 1546 if (iter.type() == relocInfo::virtual_call_type) { 1547 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1548 oop ic_oop = ic->cached_oop(); 1549 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), 1550 "Found unmarked ic_oop in reachable nmethod"); 1551 } 1552 } 1553 } 1554 #endif // !PRODUCT 1555 } 1556 1557 // This method is called twice during GC -- once while 1558 // tracing the "active" nmethods on thread stacks during 1559 // the (strong) marking phase, and then again when walking 1560 // the code cache contents during the weak roots processing 1561 // phase. The two uses are distinguished by means of the 1562 // 'do_strong_roots_only' flag, which is true in the first 1563 // case. We want to walk the weak roots in the nmethod 1564 // only in the second case. The weak roots in the nmethod 1565 // are the oops in the ExceptionCache and the InlineCache 1566 // oops. 1567 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { 1568 // make sure the oops ready to receive visitors 1569 assert(!is_zombie() && !is_unloaded(), 1570 "should not call follow on zombie or unloaded nmethod"); 1571 1572 // If the method is not entrant or zombie then a JMP is plastered over the 1573 // first few bytes. If an oop in the old code was there, that oop 1574 // should not get GC'd. Skip the first few bytes of oops on 1575 // not-entrant methods. 1576 address low_boundary = verified_entry_point(); 1577 if (is_not_entrant()) { 1578 low_boundary += NativeJump::instruction_size; 1579 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1580 // (See comment above.) 1581 } 1582 1583 // Compiled code 1584 f->do_oop((oop*) &_method); 1585 if (!do_strong_roots_only) { 1586 // weak roots processing phase -- update ExceptionCache oops 1587 ExceptionCache* ec = exception_cache(); 1588 while(ec != NULL) { 1589 f->do_oop((oop*)ec->exception_type_addr()); 1590 ec = ec->next(); 1591 } 1592 } // Else strong roots phase -- skip oops in ExceptionCache 1593 1594 RelocIterator iter(this, low_boundary); 1595 1596 while (iter.next()) { 1597 if (iter.type() == relocInfo::oop_type ) { 1598 oop_Relocation* r = iter.oop_reloc(); 1599 // In this loop, we must only follow those oops directly embedded in 1600 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1601 assert(1 == (r->oop_is_immediate()) + 1602 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1603 "oop must be found in exactly one place"); 1604 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1605 f->do_oop(r->oop_addr()); 1606 } 1607 } 1608 } 1609 1610 // Scopes 1611 // This includes oop constants not inlined in the code stream. 1612 for (oop* p = oops_begin(); p < oops_end(); p++) { 1613 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1614 f->do_oop(p); 1615 } 1616 } 1617 1618 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1619 1620 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1621 1622 // An nmethod is "marked" if its _mark_link is set non-null. 1623 // Even if it is the end of the linked list, it will have a non-null link value, 1624 // as long as it is on the list. 1625 // This code must be MP safe, because it is used from parallel GC passes. 1626 bool nmethod::test_set_oops_do_mark() { 1627 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1628 nmethod* observed_mark_link = _oops_do_mark_link; 1629 if (observed_mark_link == NULL) { 1630 // Claim this nmethod for this thread to mark. 1631 observed_mark_link = (nmethod*) 1632 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1633 if (observed_mark_link == NULL) { 1634 1635 // Atomically append this nmethod (now claimed) to the head of the list: 1636 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1637 for (;;) { 1638 nmethod* required_mark_nmethods = observed_mark_nmethods; 1639 _oops_do_mark_link = required_mark_nmethods; 1640 observed_mark_nmethods = (nmethod*) 1641 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1642 if (observed_mark_nmethods == required_mark_nmethods) 1643 break; 1644 } 1645 // Mark was clear when we first saw this guy. 1646 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n")); 1647 return false; 1648 } 1649 } 1650 // On fall through, another racing thread marked this nmethod before we did. 1651 return true; 1652 } 1653 1654 void nmethod::oops_do_marking_prologue() { 1655 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 1656 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1657 // We use cmpxchg_ptr instead of regular assignment here because the user 1658 // may fork a bunch of threads, and we need them all to see the same state. 1659 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1660 guarantee(observed == NULL, "no races in this sequential code"); 1661 } 1662 1663 void nmethod::oops_do_marking_epilogue() { 1664 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1665 nmethod* cur = _oops_do_mark_nmethods; 1666 while (cur != NMETHOD_SENTINEL) { 1667 assert(cur != NULL, "not NULL-terminated"); 1668 nmethod* next = cur->_oops_do_mark_link; 1669 cur->_oops_do_mark_link = NULL; 1670 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n")); 1671 cur = next; 1672 } 1673 void* required = _oops_do_mark_nmethods; 1674 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1675 guarantee(observed == required, "no races in this sequential code"); 1676 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 1677 } 1678 1679 class DetectScavengeRoot: public OopClosure { 1680 bool _detected_scavenge_root; 1681 public: 1682 DetectScavengeRoot() : _detected_scavenge_root(false) 1683 { NOT_PRODUCT(_print_nm = NULL); } 1684 bool detected_scavenge_root() { return _detected_scavenge_root; } 1685 virtual void do_oop(oop* p) { 1686 if ((*p) != NULL && (*p)->is_scavengable()) { 1687 NOT_PRODUCT(maybe_print(p)); 1688 _detected_scavenge_root = true; 1689 } 1690 } 1691 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1692 1693 #ifndef PRODUCT 1694 nmethod* _print_nm; 1695 void maybe_print(oop* p) { 1696 if (_print_nm == NULL) return; 1697 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1698 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")", 1699 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 1700 (intptr_t)(*p), (intptr_t)p); 1701 (*p)->print(); 1702 } 1703 #endif //PRODUCT 1704 }; 1705 1706 bool nmethod::detect_scavenge_root_oops() { 1707 DetectScavengeRoot detect_scavenge_root; 1708 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1709 oops_do(&detect_scavenge_root); 1710 return detect_scavenge_root.detected_scavenge_root(); 1711 } 1712 1713 // Method that knows how to preserve outgoing arguments at call. This method must be 1714 // called with a frame corresponding to a Java invoke 1715 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 1716 if (!method()->is_native()) { 1717 SimpleScopeDesc ssd(this, fr.pc()); 1718 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci()); 1719 bool is_static = call->is_invokestatic(); 1720 symbolOop signature = call->signature(); 1721 fr.oops_compiled_arguments_do(signature, is_static, reg_map, f); 1722 } 1723 } 1724 1725 1726 oop nmethod::embeddedOop_at(u_char* p) { 1727 RelocIterator iter(this, p, p + oopSize); 1728 while (iter.next()) 1729 if (iter.type() == relocInfo::oop_type) { 1730 return iter.oop_reloc()->oop_value(); 1731 } 1732 return NULL; 1733 } 1734 1735 1736 inline bool includes(void* p, void* from, void* to) { 1737 return from <= p && p < to; 1738 } 1739 1740 1741 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1742 assert(count >= 2, "must be sentinel values, at least"); 1743 1744 #ifdef ASSERT 1745 // must be sorted and unique; we do a binary search in find_pc_desc() 1746 int prev_offset = pcs[0].pc_offset(); 1747 assert(prev_offset == PcDesc::lower_offset_limit, 1748 "must start with a sentinel"); 1749 for (int i = 1; i < count; i++) { 1750 int this_offset = pcs[i].pc_offset(); 1751 assert(this_offset > prev_offset, "offsets must be sorted"); 1752 prev_offset = this_offset; 1753 } 1754 assert(prev_offset == PcDesc::upper_offset_limit, 1755 "must end with a sentinel"); 1756 #endif //ASSERT 1757 1758 int size = count * sizeof(PcDesc); 1759 assert(scopes_pcs_size() >= size, "oob"); 1760 memcpy(scopes_pcs_begin(), pcs, size); 1761 1762 // Adjust the final sentinel downward. 1763 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1764 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1765 last_pc->set_pc_offset(instructions_size() + 1); 1766 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1767 // Fill any rounding gaps with copies of the last record. 1768 last_pc[1] = last_pc[0]; 1769 } 1770 // The following assert could fail if sizeof(PcDesc) is not 1771 // an integral multiple of oopSize (the rounding term). 1772 // If it fails, change the logic to always allocate a multiple 1773 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1774 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1775 } 1776 1777 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1778 assert(scopes_data_size() >= size, "oob"); 1779 memcpy(scopes_data_begin(), buffer, size); 1780 } 1781 1782 1783 #ifdef ASSERT 1784 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 1785 PcDesc* lower = nm->scopes_pcs_begin(); 1786 PcDesc* upper = nm->scopes_pcs_end(); 1787 lower += 1; // exclude initial sentinel 1788 PcDesc* res = NULL; 1789 for (PcDesc* p = lower; p < upper; p++) { 1790 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1791 if (match_desc(p, pc_offset, approximate)) { 1792 if (res == NULL) 1793 res = p; 1794 else 1795 res = (PcDesc*) badAddress; 1796 } 1797 } 1798 return res; 1799 } 1800 #endif 1801 1802 1803 // Finds a PcDesc with real-pc equal to "pc" 1804 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 1805 address base_address = instructions_begin(); 1806 if ((pc < base_address) || 1807 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1808 return NULL; // PC is wildly out of range 1809 } 1810 int pc_offset = (int) (pc - base_address); 1811 1812 // Check the PcDesc cache if it contains the desired PcDesc 1813 // (This as an almost 100% hit rate.) 1814 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1815 if (res != NULL) { 1816 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 1817 return res; 1818 } 1819 1820 // Fallback algorithm: quasi-linear search for the PcDesc 1821 // Find the last pc_offset less than the given offset. 1822 // The successor must be the required match, if there is a match at all. 1823 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1824 PcDesc* lower = scopes_pcs_begin(); 1825 PcDesc* upper = scopes_pcs_end(); 1826 upper -= 1; // exclude final sentinel 1827 if (lower >= upper) return NULL; // native method; no PcDescs at all 1828 1829 #define assert_LU_OK \ 1830 /* invariant on lower..upper during the following search: */ \ 1831 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1832 assert(upper->pc_offset() >= pc_offset, "sanity") 1833 assert_LU_OK; 1834 1835 // Use the last successful return as a split point. 1836 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1837 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1838 if (mid->pc_offset() < pc_offset) { 1839 lower = mid; 1840 } else { 1841 upper = mid; 1842 } 1843 1844 // Take giant steps at first (4096, then 256, then 16, then 1) 1845 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1846 const int RADIX = (1 << LOG2_RADIX); 1847 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1848 while ((mid = lower + step) < upper) { 1849 assert_LU_OK; 1850 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1851 if (mid->pc_offset() < pc_offset) { 1852 lower = mid; 1853 } else { 1854 upper = mid; 1855 break; 1856 } 1857 } 1858 assert_LU_OK; 1859 } 1860 1861 // Sneak up on the value with a linear search of length ~16. 1862 while (true) { 1863 assert_LU_OK; 1864 mid = lower + 1; 1865 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1866 if (mid->pc_offset() < pc_offset) { 1867 lower = mid; 1868 } else { 1869 upper = mid; 1870 break; 1871 } 1872 } 1873 #undef assert_LU_OK 1874 1875 if (match_desc(upper, pc_offset, approximate)) { 1876 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 1877 _pc_desc_cache.add_pc_desc(upper); 1878 return upper; 1879 } else { 1880 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 1881 return NULL; 1882 } 1883 } 1884 1885 1886 bool nmethod::check_all_dependencies() { 1887 bool found_check = false; 1888 // wholesale check of all dependencies 1889 for (Dependencies::DepStream deps(this); deps.next(); ) { 1890 if (deps.check_dependency() != NULL) { 1891 found_check = true; 1892 NOT_DEBUG(break); 1893 } 1894 } 1895 return found_check; // tell caller if we found anything 1896 } 1897 1898 bool nmethod::check_dependency_on(DepChange& changes) { 1899 // What has happened: 1900 // 1) a new class dependee has been added 1901 // 2) dependee and all its super classes have been marked 1902 bool found_check = false; // set true if we are upset 1903 for (Dependencies::DepStream deps(this); deps.next(); ) { 1904 // Evaluate only relevant dependencies. 1905 if (deps.spot_check_dependency_at(changes) != NULL) { 1906 found_check = true; 1907 NOT_DEBUG(break); 1908 } 1909 } 1910 return found_check; 1911 } 1912 1913 bool nmethod::is_evol_dependent_on(klassOop dependee) { 1914 instanceKlass *dependee_ik = instanceKlass::cast(dependee); 1915 objArrayOop dependee_methods = dependee_ik->methods(); 1916 for (Dependencies::DepStream deps(this); deps.next(); ) { 1917 if (deps.type() == Dependencies::evol_method) { 1918 methodOop method = deps.method_argument(0); 1919 for (int j = 0; j < dependee_methods->length(); j++) { 1920 if ((methodOop) dependee_methods->obj_at(j) == method) { 1921 // RC_TRACE macro has an embedded ResourceMark 1922 RC_TRACE(0x01000000, 1923 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1924 _method->method_holder()->klass_part()->external_name(), 1925 _method->name()->as_C_string(), 1926 _method->signature()->as_C_string(), compile_id(), 1927 method->method_holder()->klass_part()->external_name(), 1928 method->name()->as_C_string(), 1929 method->signature()->as_C_string())); 1930 if (TraceDependencies || LogCompilation) 1931 deps.log_dependency(dependee); 1932 return true; 1933 } 1934 } 1935 } 1936 } 1937 return false; 1938 } 1939 1940 // Called from mark_for_deoptimization, when dependee is invalidated. 1941 bool nmethod::is_dependent_on_method(methodOop dependee) { 1942 for (Dependencies::DepStream deps(this); deps.next(); ) { 1943 if (deps.type() != Dependencies::evol_method) 1944 continue; 1945 methodOop method = deps.method_argument(0); 1946 if (method == dependee) return true; 1947 } 1948 return false; 1949 } 1950 1951 1952 bool nmethod::is_patchable_at(address instr_addr) { 1953 assert (code_contains(instr_addr), "wrong nmethod used"); 1954 if (is_zombie()) { 1955 // a zombie may never be patched 1956 return false; 1957 } 1958 return true; 1959 } 1960 1961 1962 address nmethod::continuation_for_implicit_exception(address pc) { 1963 // Exception happened outside inline-cache check code => we are inside 1964 // an active nmethod => use cpc to determine a return address 1965 int exception_offset = pc - instructions_begin(); 1966 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 1967 #ifdef ASSERT 1968 if (cont_offset == 0) { 1969 Thread* thread = ThreadLocalStorage::get_thread_slow(); 1970 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 1971 HandleMark hm(thread); 1972 ResourceMark rm(thread); 1973 CodeBlob* cb = CodeCache::find_blob(pc); 1974 assert(cb != NULL && cb == this, ""); 1975 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 1976 print(); 1977 method()->print_codes(); 1978 print_code(); 1979 print_pcs(); 1980 } 1981 #endif 1982 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code"); 1983 return instructions_begin() + cont_offset; 1984 } 1985 1986 1987 1988 void nmethod_init() { 1989 // make sure you didn't forget to adjust the filler fields 1990 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word"); 1991 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 1992 } 1993 1994 1995 //------------------------------------------------------------------------------------------- 1996 1997 1998 // QQQ might we make this work from a frame?? 1999 nmethodLocker::nmethodLocker(address pc) { 2000 CodeBlob* cb = CodeCache::find_blob(pc); 2001 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2002 _nm = (nmethod*)cb; 2003 lock_nmethod(_nm); 2004 } 2005 2006 void nmethodLocker::lock_nmethod(nmethod* nm) { 2007 if (nm == NULL) return; 2008 Atomic::inc(&nm->_lock_count); 2009 guarantee(!nm->is_zombie(), "cannot lock a zombie method"); 2010 } 2011 2012 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2013 if (nm == NULL) return; 2014 Atomic::dec(&nm->_lock_count); 2015 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2016 } 2017 2018 bool nmethod::is_deopt_pc(address pc) { 2019 bool ret = pc == deopt_handler_begin(); 2020 return ret; 2021 } 2022 2023 2024 // ----------------------------------------------------------------------------- 2025 // Verification 2026 2027 class VerifyOopsClosure: public OopClosure { 2028 nmethod* _nm; 2029 bool _ok; 2030 public: 2031 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2032 bool ok() { return _ok; } 2033 virtual void do_oop(oop* p) { 2034 if ((*p) == NULL || (*p)->is_oop()) return; 2035 if (_ok) { 2036 _nm->print_nmethod(true); 2037 _ok = false; 2038 } 2039 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2040 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2041 } 2042 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2043 }; 2044 2045 void nmethod::verify() { 2046 2047 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2048 // seems odd. 2049 2050 if( is_zombie() || is_not_entrant() ) 2051 return; 2052 2053 // Make sure all the entry points are correctly aligned for patching. 2054 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2055 2056 assert(method()->is_oop(), "must be valid"); 2057 2058 ResourceMark rm; 2059 2060 if (!CodeCache::contains(this)) { 2061 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this); 2062 } 2063 2064 if(is_native_method() ) 2065 return; 2066 2067 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2068 if (nm != this) { 2069 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this); 2070 } 2071 2072 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2073 if (! p->verify(this)) { 2074 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2075 } 2076 } 2077 2078 VerifyOopsClosure voc(this); 2079 oops_do(&voc); 2080 assert(voc.ok(), "embedded oops must be OK"); 2081 verify_scavenge_root_oops(); 2082 2083 verify_scopes(); 2084 } 2085 2086 2087 void nmethod::verify_interrupt_point(address call_site) { 2088 // This code does not work in release mode since 2089 // owns_lock only is available in debug mode. 2090 CompiledIC* ic = NULL; 2091 Thread *cur = Thread::current(); 2092 if (CompiledIC_lock->owner() == cur || 2093 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2094 SafepointSynchronize::is_at_safepoint())) { 2095 ic = CompiledIC_at(call_site); 2096 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2097 } else { 2098 MutexLocker ml_verify (CompiledIC_lock); 2099 ic = CompiledIC_at(call_site); 2100 } 2101 PcDesc* pd = pc_desc_at(ic->end_of_call()); 2102 assert(pd != NULL, "PcDesc must exist"); 2103 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2104 pd->obj_decode_offset(), pd->should_reexecute()); 2105 !sd->is_top(); sd = sd->sender()) { 2106 sd->verify(); 2107 } 2108 } 2109 2110 void nmethod::verify_scopes() { 2111 if( !method() ) return; // Runtime stubs have no scope 2112 if (method()->is_native()) return; // Ignore stub methods. 2113 // iterate through all interrupt point 2114 // and verify the debug information is valid. 2115 RelocIterator iter((nmethod*)this); 2116 while (iter.next()) { 2117 address stub = NULL; 2118 switch (iter.type()) { 2119 case relocInfo::virtual_call_type: 2120 verify_interrupt_point(iter.addr()); 2121 break; 2122 case relocInfo::opt_virtual_call_type: 2123 stub = iter.opt_virtual_call_reloc()->static_stub(); 2124 verify_interrupt_point(iter.addr()); 2125 break; 2126 case relocInfo::static_call_type: 2127 stub = iter.static_call_reloc()->static_stub(); 2128 //verify_interrupt_point(iter.addr()); 2129 break; 2130 case relocInfo::runtime_call_type: 2131 address destination = iter.reloc()->value(); 2132 // Right now there is no way to find out which entries support 2133 // an interrupt point. It would be nice if we had this 2134 // information in a table. 2135 break; 2136 } 2137 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2138 } 2139 } 2140 2141 2142 // ----------------------------------------------------------------------------- 2143 // Non-product code 2144 #ifndef PRODUCT 2145 2146 class DebugScavengeRoot: public OopClosure { 2147 nmethod* _nm; 2148 bool _ok; 2149 public: 2150 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2151 bool ok() { return _ok; } 2152 virtual void do_oop(oop* p) { 2153 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2154 if (_ok) { 2155 _nm->print_nmethod(true); 2156 _ok = false; 2157 } 2158 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2159 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2160 (*p)->print(); 2161 } 2162 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2163 }; 2164 2165 void nmethod::verify_scavenge_root_oops() { 2166 if (!on_scavenge_root_list()) { 2167 // Actually look inside, to verify the claim that it's clean. 2168 DebugScavengeRoot debug_scavenge_root(this); 2169 oops_do(&debug_scavenge_root); 2170 if (!debug_scavenge_root.ok()) 2171 fatal("found an unadvertised bad non-perm oop in the code cache"); 2172 } 2173 assert(scavenge_root_not_marked(), ""); 2174 } 2175 2176 #endif // PRODUCT 2177 2178 // Printing operations 2179 2180 void nmethod::print() const { 2181 ResourceMark rm; 2182 ttyLocker ttyl; // keep the following output all in one block 2183 2184 tty->print("Compiled "); 2185 2186 if (is_compiled_by_c1()) { 2187 tty->print("(c1) "); 2188 } else if (is_compiled_by_c2()) { 2189 tty->print("(c2) "); 2190 } else { 2191 tty->print("(nm) "); 2192 } 2193 2194 print_on(tty, "nmethod"); 2195 tty->cr(); 2196 if (WizardMode) { 2197 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2198 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2199 tty->print(" { "); 2200 if (version()) tty->print("v%d ", version()); 2201 if (level()) tty->print("l%d ", level()); 2202 if (is_in_use()) tty->print("in_use "); 2203 if (is_not_entrant()) tty->print("not_entrant "); 2204 if (is_zombie()) tty->print("zombie "); 2205 if (is_unloaded()) tty->print("unloaded "); 2206 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2207 tty->print_cr("}:"); 2208 } 2209 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2210 (address)this, 2211 (address)this + size(), 2212 size()); 2213 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2214 relocation_begin(), 2215 relocation_end(), 2216 relocation_size()); 2217 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2218 code_begin(), 2219 code_end(), 2220 code_size()); 2221 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2222 stub_begin(), 2223 stub_end(), 2224 stub_size()); 2225 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2226 consts_begin(), 2227 consts_end(), 2228 consts_size()); 2229 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2230 scopes_data_begin(), 2231 scopes_data_end(), 2232 scopes_data_size()); 2233 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2234 scopes_pcs_begin(), 2235 scopes_pcs_end(), 2236 scopes_pcs_size()); 2237 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2238 dependencies_begin(), 2239 dependencies_end(), 2240 dependencies_size()); 2241 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2242 handler_table_begin(), 2243 handler_table_end(), 2244 handler_table_size()); 2245 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2246 nul_chk_table_begin(), 2247 nul_chk_table_end(), 2248 nul_chk_table_size()); 2249 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2250 oops_begin(), 2251 oops_end(), 2252 oops_size()); 2253 } 2254 2255 void nmethod::print_code() { 2256 HandleMark hm; 2257 ResourceMark m; 2258 Disassembler::decode(this); 2259 } 2260 2261 2262 #ifndef PRODUCT 2263 2264 void nmethod::print_scopes() { 2265 // Find the first pc desc for all scopes in the code and print it. 2266 ResourceMark rm; 2267 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2268 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2269 continue; 2270 2271 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2272 sd->print_on(tty, p); 2273 } 2274 } 2275 2276 void nmethod::print_dependencies() { 2277 ResourceMark rm; 2278 ttyLocker ttyl; // keep the following output all in one block 2279 tty->print_cr("Dependencies:"); 2280 for (Dependencies::DepStream deps(this); deps.next(); ) { 2281 deps.print_dependency(); 2282 klassOop ctxk = deps.context_type(); 2283 if (ctxk != NULL) { 2284 Klass* k = Klass::cast(ctxk); 2285 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { 2286 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); 2287 } 2288 } 2289 deps.log_dependency(); // put it into the xml log also 2290 } 2291 } 2292 2293 2294 void nmethod::print_relocations() { 2295 ResourceMark m; // in case methods get printed via the debugger 2296 tty->print_cr("relocations:"); 2297 RelocIterator iter(this); 2298 iter.print(); 2299 if (UseRelocIndex) { 2300 jint* index_end = (jint*)relocation_end() - 1; 2301 jint index_size = *index_end; 2302 jint* index_start = (jint*)( (address)index_end - index_size ); 2303 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2304 if (index_size > 0) { 2305 jint* ip; 2306 for (ip = index_start; ip+2 <= index_end; ip += 2) 2307 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2308 ip[0], 2309 ip[1], 2310 header_end()+ip[0], 2311 relocation_begin()-1+ip[1]); 2312 for (; ip < index_end; ip++) 2313 tty->print_cr(" (%d ?)", ip[0]); 2314 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); 2315 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2316 } 2317 } 2318 } 2319 2320 2321 void nmethod::print_pcs() { 2322 ResourceMark m; // in case methods get printed via debugger 2323 tty->print_cr("pc-bytecode offsets:"); 2324 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2325 p->print(this); 2326 } 2327 } 2328 2329 #endif // PRODUCT 2330 2331 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2332 RelocIterator iter(this, begin, end); 2333 bool have_one = false; 2334 while (iter.next()) { 2335 have_one = true; 2336 switch (iter.type()) { 2337 case relocInfo::none: return "no_reloc"; 2338 case relocInfo::oop_type: { 2339 stringStream st; 2340 oop_Relocation* r = iter.oop_reloc(); 2341 oop obj = r->oop_value(); 2342 st.print("oop("); 2343 if (obj == NULL) st.print("NULL"); 2344 else obj->print_value_on(&st); 2345 st.print(")"); 2346 return st.as_string(); 2347 } 2348 case relocInfo::virtual_call_type: return "virtual_call"; 2349 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2350 case relocInfo::static_call_type: return "static_call"; 2351 case relocInfo::static_stub_type: return "static_stub"; 2352 case relocInfo::runtime_call_type: return "runtime_call"; 2353 case relocInfo::external_word_type: return "external_word"; 2354 case relocInfo::internal_word_type: return "internal_word"; 2355 case relocInfo::section_word_type: return "section_word"; 2356 case relocInfo::poll_type: return "poll"; 2357 case relocInfo::poll_return_type: return "poll_return"; 2358 case relocInfo::type_mask: return "type_bit_mask"; 2359 } 2360 } 2361 return have_one ? "other" : NULL; 2362 } 2363 2364 // Return a the last scope in (begin..end] 2365 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2366 PcDesc* p = pc_desc_near(begin+1); 2367 if (p != NULL && p->real_pc(this) <= end) { 2368 return new ScopeDesc(this, p->scope_decode_offset(), 2369 p->obj_decode_offset(), p->should_reexecute()); 2370 } 2371 return NULL; 2372 } 2373 2374 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2375 // First, find an oopmap in (begin, end]. 2376 // We use the odd half-closed interval so that oop maps and scope descs 2377 // which are tied to the byte after a call are printed with the call itself. 2378 address base = instructions_begin(); 2379 OopMapSet* oms = oop_maps(); 2380 if (oms != NULL) { 2381 for (int i = 0, imax = oms->size(); i < imax; i++) { 2382 OopMap* om = oms->at(i); 2383 address pc = base + om->offset(); 2384 if (pc > begin) { 2385 if (pc <= end) { 2386 st->move_to(column); 2387 st->print("; "); 2388 om->print_on(st); 2389 } 2390 break; 2391 } 2392 } 2393 } 2394 2395 // Print any debug info present at this pc. 2396 ScopeDesc* sd = scope_desc_in(begin, end); 2397 if (sd != NULL) { 2398 st->move_to(column); 2399 if (sd->bci() == SynchronizationEntryBCI) { 2400 st->print(";*synchronization entry"); 2401 } else { 2402 if (sd->method().is_null()) { 2403 st->print("method is NULL"); 2404 } else if (sd->method()->is_native()) { 2405 st->print("method is native"); 2406 } else { 2407 address bcp = sd->method()->bcp_from(sd->bci()); 2408 Bytecodes::Code bc = Bytecodes::java_code_at(bcp); 2409 st->print(";*%s", Bytecodes::name(bc)); 2410 switch (bc) { 2411 case Bytecodes::_invokevirtual: 2412 case Bytecodes::_invokespecial: 2413 case Bytecodes::_invokestatic: 2414 case Bytecodes::_invokeinterface: 2415 { 2416 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci()); 2417 st->print(" "); 2418 if (invoke->name() != NULL) 2419 invoke->name()->print_symbol_on(st); 2420 else 2421 st->print("<UNKNOWN>"); 2422 break; 2423 } 2424 case Bytecodes::_getfield: 2425 case Bytecodes::_putfield: 2426 case Bytecodes::_getstatic: 2427 case Bytecodes::_putstatic: 2428 { 2429 methodHandle sdm = sd->method(); 2430 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci())); 2431 constantPoolOop sdmc = sdm->constants(); 2432 symbolOop name = sdmc->name_ref_at(field->index()); 2433 st->print(" "); 2434 if (name != NULL) 2435 name->print_symbol_on(st); 2436 else 2437 st->print("<UNKNOWN>"); 2438 } 2439 } 2440 } 2441 } 2442 2443 // Print all scopes 2444 for (;sd != NULL; sd = sd->sender()) { 2445 st->move_to(column); 2446 st->print("; -"); 2447 if (sd->method().is_null()) { 2448 st->print("method is NULL"); 2449 } else { 2450 sd->method()->print_short_name(st); 2451 } 2452 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2453 if (lineno != -1) { 2454 st->print("@%d (line %d)", sd->bci(), lineno); 2455 } else { 2456 st->print("@%d", sd->bci()); 2457 } 2458 st->cr(); 2459 } 2460 } 2461 2462 // Print relocation information 2463 const char* str = reloc_string_for(begin, end); 2464 if (str != NULL) { 2465 if (sd != NULL) st->cr(); 2466 st->move_to(column); 2467 st->print("; {%s}", str); 2468 } 2469 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin()); 2470 if (cont_offset != 0) { 2471 st->move_to(column); 2472 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset); 2473 } 2474 2475 } 2476 2477 #ifndef PRODUCT 2478 2479 void nmethod::print_value_on(outputStream* st) const { 2480 print_on(st, "nmethod"); 2481 } 2482 2483 void nmethod::print_calls(outputStream* st) { 2484 RelocIterator iter(this); 2485 while (iter.next()) { 2486 switch (iter.type()) { 2487 case relocInfo::virtual_call_type: 2488 case relocInfo::opt_virtual_call_type: { 2489 VerifyMutexLocker mc(CompiledIC_lock); 2490 CompiledIC_at(iter.reloc())->print(); 2491 break; 2492 } 2493 case relocInfo::static_call_type: 2494 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 2495 compiledStaticCall_at(iter.reloc())->print(); 2496 break; 2497 } 2498 } 2499 } 2500 2501 void nmethod::print_handler_table() { 2502 ExceptionHandlerTable(this).print(); 2503 } 2504 2505 void nmethod::print_nul_chk_table() { 2506 ImplicitExceptionTable(this).print(instructions_begin()); 2507 } 2508 2509 void nmethod::print_statistics() { 2510 ttyLocker ttyl; 2511 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2512 nmethod_stats.print_native_nmethod_stats(); 2513 nmethod_stats.print_nmethod_stats(); 2514 DebugInformationRecorder::print_statistics(); 2515 nmethod_stats.print_pc_stats(); 2516 Dependencies::print_statistics(); 2517 if (xtty != NULL) xtty->tail("statistics"); 2518 } 2519 2520 #endif // PRODUCT --- EOF ---