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 (is_osr_method()) return "osr"; 418 if (method() != NULL && is_native_method()) return "c2n"; 419 return NULL; 420 } 421 422 // %%% This variable is no longer used? 423 int nmethod::_zombie_instruction_size = NativeJump::instruction_size; 424 425 426 nmethod* nmethod::new_native_nmethod(methodHandle method, 427 CodeBuffer *code_buffer, 428 int vep_offset, 429 int frame_complete, 430 int frame_size, 431 ByteSize basic_lock_owner_sp_offset, 432 ByteSize basic_lock_sp_offset, 433 OopMapSet* oop_maps) { 434 // create nmethod 435 nmethod* nm = NULL; 436 { 437 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 438 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 439 CodeOffsets offsets; 440 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 441 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 442 nm = new (native_nmethod_size) 443 nmethod(method(), native_nmethod_size, &offsets, 444 code_buffer, frame_size, 445 basic_lock_owner_sp_offset, basic_lock_sp_offset, 446 oop_maps); 447 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 448 if (PrintAssembly && nm != NULL) 449 Disassembler::decode(nm); 450 } 451 // verify nmethod 452 debug_only(if (nm) nm->verify();) // might block 453 454 if (nm != NULL) { 455 nm->log_new_nmethod(); 456 } 457 458 return nm; 459 } 460 461 #ifdef HAVE_DTRACE_H 462 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 463 CodeBuffer *code_buffer, 464 int vep_offset, 465 int trap_offset, 466 int frame_complete, 467 int frame_size) { 468 // create nmethod 469 nmethod* nm = NULL; 470 { 471 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 472 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 473 CodeOffsets offsets; 474 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 475 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 476 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 477 478 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); 479 480 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 481 if (PrintAssembly && nm != NULL) 482 Disassembler::decode(nm); 483 } 484 // verify nmethod 485 debug_only(if (nm) nm->verify();) // might block 486 487 if (nm != NULL) { 488 nm->log_new_nmethod(); 489 } 490 491 return nm; 492 } 493 494 #endif // def HAVE_DTRACE_H 495 496 nmethod* nmethod::new_nmethod(methodHandle method, 497 int compile_id, 498 int entry_bci, 499 CodeOffsets* offsets, 500 int orig_pc_offset, 501 DebugInformationRecorder* debug_info, 502 Dependencies* dependencies, 503 CodeBuffer* code_buffer, int frame_size, 504 OopMapSet* oop_maps, 505 ExceptionHandlerTable* handler_table, 506 ImplicitExceptionTable* nul_chk_table, 507 AbstractCompiler* compiler, 508 int comp_level 509 ) 510 { 511 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 512 // create nmethod 513 nmethod* nm = NULL; 514 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 515 int nmethod_size = 516 allocation_size(code_buffer, sizeof(nmethod)) 517 + adjust_pcs_size(debug_info->pcs_size()) 518 + round_to(dependencies->size_in_bytes() , oopSize) 519 + round_to(handler_table->size_in_bytes(), oopSize) 520 + round_to(nul_chk_table->size_in_bytes(), oopSize) 521 + round_to(debug_info->data_size() , oopSize); 522 nm = new (nmethod_size) 523 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 524 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 525 oop_maps, 526 handler_table, 527 nul_chk_table, 528 compiler, 529 comp_level); 530 if (nm != NULL) { 531 // To make dependency checking during class loading fast, record 532 // the nmethod dependencies in the classes it is dependent on. 533 // This allows the dependency checking code to simply walk the 534 // class hierarchy above the loaded class, checking only nmethods 535 // which are dependent on those classes. The slow way is to 536 // check every nmethod for dependencies which makes it linear in 537 // the number of methods compiled. For applications with a lot 538 // classes the slow way is too slow. 539 for (Dependencies::DepStream deps(nm); deps.next(); ) { 540 klassOop klass = deps.context_type(); 541 if (klass == NULL) continue; // ignore things like evol_method 542 543 // record this nmethod as dependent on this klass 544 instanceKlass::cast(klass)->add_dependent_nmethod(nm); 545 } 546 } 547 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 548 if (PrintAssembly && nm != NULL) 549 Disassembler::decode(nm); 550 } 551 552 // verify nmethod 553 debug_only(if (nm) nm->verify();) // might block 554 555 if (nm != NULL) { 556 nm->log_new_nmethod(); 557 } 558 559 // done 560 return nm; 561 } 562 563 564 // For native wrappers 565 nmethod::nmethod( 566 methodOop method, 567 int nmethod_size, 568 CodeOffsets* offsets, 569 CodeBuffer* code_buffer, 570 int frame_size, 571 ByteSize basic_lock_owner_sp_offset, 572 ByteSize basic_lock_sp_offset, 573 OopMapSet* oop_maps ) 574 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 575 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 576 _compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset), 577 _compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset) 578 { 579 { 580 debug_only(No_Safepoint_Verifier nsv;) 581 assert_locked_or_safepoint(CodeCache_lock); 582 583 NOT_PRODUCT(_has_debug_info = false); 584 _oops_do_mark_link = NULL; 585 _method = method; 586 _entry_bci = InvocationEntryBci; 587 _osr_link = NULL; 588 _scavenge_root_link = NULL; 589 _scavenge_root_state = 0; 590 _compiler = NULL; 591 // We have no exception handler or deopt handler make the 592 // values something that will never match a pc like the nmethod vtable entry 593 _exception_offset = 0; 594 _deoptimize_offset = 0; 595 _orig_pc_offset = 0; 596 #ifdef HAVE_DTRACE_H 597 _trap_offset = 0; 598 #endif // def HAVE_DTRACE_H 599 _stub_offset = data_offset(); 600 _consts_offset = data_offset(); 601 _scopes_data_offset = data_offset(); 602 _scopes_pcs_offset = _scopes_data_offset; 603 _dependencies_offset = _scopes_pcs_offset; 604 _handler_table_offset = _dependencies_offset; 605 _nul_chk_table_offset = _handler_table_offset; 606 _nmethod_end_offset = _nul_chk_table_offset; 607 _compile_id = 0; // default 608 _comp_level = CompLevel_none; 609 _entry_point = instructions_begin(); 610 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); 611 _osr_entry_point = NULL; 612 _exception_cache = NULL; 613 _pc_desc_cache.reset_to(NULL); 614 615 flags.clear(); 616 flags.state = alive; 617 _markedForDeoptimization = 0; 618 619 _lock_count = 0; 620 _stack_traversal_mark = 0; 621 622 code_buffer->copy_oops_to(this); 623 debug_only(verify_scavenge_root_oops()); 624 CodeCache::commit(this); 625 VTune::create_nmethod(this); 626 } 627 628 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 629 ttyLocker ttyl; // keep the following output all in one block 630 // This output goes directly to the tty, not the compiler log. 631 // To enable tools to match it up with the compilation activity, 632 // be sure to tag this tty output with the compile ID. 633 if (xtty != NULL) { 634 xtty->begin_head("print_native_nmethod"); 635 xtty->method(_method); 636 xtty->stamp(); 637 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 638 } 639 // print the header part first 640 print(); 641 // then print the requested information 642 if (PrintNativeNMethods) { 643 print_code(); 644 oop_maps->print(); 645 } 646 if (PrintRelocations) { 647 print_relocations(); 648 } 649 if (xtty != NULL) { 650 xtty->tail("print_native_nmethod"); 651 } 652 } 653 Events::log("Create nmethod " INTPTR_FORMAT, this); 654 } 655 656 // For dtrace wrappers 657 #ifdef HAVE_DTRACE_H 658 nmethod::nmethod( 659 methodOop method, 660 int nmethod_size, 661 CodeOffsets* offsets, 662 CodeBuffer* code_buffer, 663 int frame_size) 664 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 665 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 666 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), 667 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) 668 { 669 { 670 debug_only(No_Safepoint_Verifier nsv;) 671 assert_locked_or_safepoint(CodeCache_lock); 672 673 NOT_PRODUCT(_has_debug_info = false); 674 _oops_do_mark_link = NULL; 675 _method = method; 676 _entry_bci = InvocationEntryBci; 677 _osr_link = NULL; 678 _scavenge_root_link = NULL; 679 _scavenge_root_state = 0; 680 _compiler = NULL; 681 // We have no exception handler or deopt handler make the 682 // values something that will never match a pc like the nmethod vtable entry 683 _exception_offset = 0; 684 _deoptimize_offset = 0; 685 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 686 _orig_pc_offset = 0; 687 _stub_offset = data_offset(); 688 _consts_offset = data_offset(); 689 _scopes_data_offset = data_offset(); 690 _scopes_pcs_offset = _scopes_data_offset; 691 _dependencies_offset = _scopes_pcs_offset; 692 _handler_table_offset = _dependencies_offset; 693 _nul_chk_table_offset = _handler_table_offset; 694 _nmethod_end_offset = _nul_chk_table_offset; 695 _compile_id = 0; // default 696 _comp_level = CompLevel_none; 697 _entry_point = instructions_begin(); 698 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); 699 _osr_entry_point = NULL; 700 _exception_cache = NULL; 701 _pc_desc_cache.reset_to(NULL); 702 703 flags.clear(); 704 flags.state = alive; 705 _markedForDeoptimization = 0; 706 707 _lock_count = 0; 708 _stack_traversal_mark = 0; 709 710 code_buffer->copy_oops_to(this); 711 debug_only(verify_scavenge_root_oops()); 712 CodeCache::commit(this); 713 VTune::create_nmethod(this); 714 } 715 716 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 717 ttyLocker ttyl; // keep the following output all in one block 718 // This output goes directly to the tty, not the compiler log. 719 // To enable tools to match it up with the compilation activity, 720 // be sure to tag this tty output with the compile ID. 721 if (xtty != NULL) { 722 xtty->begin_head("print_dtrace_nmethod"); 723 xtty->method(_method); 724 xtty->stamp(); 725 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 726 } 727 // print the header part first 728 print(); 729 // then print the requested information 730 if (PrintNMethods) { 731 print_code(); 732 } 733 if (PrintRelocations) { 734 print_relocations(); 735 } 736 if (xtty != NULL) { 737 xtty->tail("print_dtrace_nmethod"); 738 } 739 } 740 Events::log("Create nmethod " INTPTR_FORMAT, this); 741 } 742 #endif // def HAVE_DTRACE_H 743 744 void* nmethod::operator new(size_t size, int nmethod_size) { 745 // Always leave some room in the CodeCache for I2C/C2I adapters 746 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) return NULL; 747 return CodeCache::allocate(nmethod_size); 748 } 749 750 751 nmethod::nmethod( 752 methodOop method, 753 int nmethod_size, 754 int compile_id, 755 int entry_bci, 756 CodeOffsets* offsets, 757 int orig_pc_offset, 758 DebugInformationRecorder* debug_info, 759 Dependencies* dependencies, 760 CodeBuffer *code_buffer, 761 int frame_size, 762 OopMapSet* oop_maps, 763 ExceptionHandlerTable* handler_table, 764 ImplicitExceptionTable* nul_chk_table, 765 AbstractCompiler* compiler, 766 int comp_level 767 ) 768 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 769 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 770 _compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)), 771 _compiled_synchronized_native_basic_lock_sp_offset(in_ByteSize(-1)) 772 { 773 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 774 { 775 debug_only(No_Safepoint_Verifier nsv;) 776 assert_locked_or_safepoint(CodeCache_lock); 777 778 NOT_PRODUCT(_has_debug_info = false); 779 _oops_do_mark_link = NULL; 780 _method = method; 781 _compile_id = compile_id; 782 _comp_level = comp_level; 783 _entry_bci = entry_bci; 784 _osr_link = NULL; 785 _scavenge_root_link = NULL; 786 _scavenge_root_state = 0; 787 _compiler = compiler; 788 _orig_pc_offset = orig_pc_offset; 789 #ifdef HAVE_DTRACE_H 790 _trap_offset = 0; 791 #endif // def HAVE_DTRACE_H 792 _stub_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start()); 793 794 // Exception handler and deopt handler are in the stub section 795 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 796 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 797 _consts_offset = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start()); 798 _scopes_data_offset = data_offset(); 799 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 800 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 801 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 802 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 803 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 804 805 _entry_point = instructions_begin(); 806 _verified_entry_point = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry); 807 _osr_entry_point = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry); 808 _exception_cache = NULL; 809 _pc_desc_cache.reset_to(scopes_pcs_begin()); 810 811 flags.clear(); 812 flags.state = alive; 813 _markedForDeoptimization = 0; 814 815 _unload_reported = false; // jvmti state 816 817 _lock_count = 0; 818 _stack_traversal_mark = 0; 819 820 // Copy contents of ScopeDescRecorder to nmethod 821 code_buffer->copy_oops_to(this); 822 debug_info->copy_to(this); 823 dependencies->copy_to(this); 824 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 825 CodeCache::add_scavenge_root_nmethod(this); 826 } 827 debug_only(verify_scavenge_root_oops()); 828 829 CodeCache::commit(this); 830 831 VTune::create_nmethod(this); 832 833 // Copy contents of ExceptionHandlerTable to nmethod 834 handler_table->copy_to(this); 835 nul_chk_table->copy_to(this); 836 837 // we use the information of entry points to find out if a method is 838 // static or non static 839 assert(compiler->is_c2() || 840 _method->is_static() == (entry_point() == _verified_entry_point), 841 " entry points must be same for static methods and vice versa"); 842 } 843 844 bool printnmethods = PrintNMethods 845 || CompilerOracle::should_print(_method) 846 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 847 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 848 print_nmethod(printnmethods); 849 } 850 851 // Note: Do not verify in here as the CodeCache_lock is 852 // taken which would conflict with the CompiledIC_lock 853 // which taken during the verification of call sites. 854 // (was bug - gri 10/25/99) 855 856 Events::log("Create nmethod " INTPTR_FORMAT, this); 857 } 858 859 860 // Print a short set of xml attributes to identify this nmethod. The 861 // output should be embedded in some other element. 862 void nmethod::log_identity(xmlStream* log) const { 863 log->print(" compile_id='%d'", compile_id()); 864 const char* nm_kind = compile_kind(); 865 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 866 if (compiler() != NULL) { 867 log->print(" compiler='%s'", compiler()->name()); 868 } 869 #ifdef TIERED 870 log->print(" level='%d'", comp_level()); 871 #endif // TIERED 872 } 873 874 875 #define LOG_OFFSET(log, name) \ 876 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 877 log->print(" " XSTR(name) "_offset='%d'" , \ 878 (intptr_t)name##_begin() - (intptr_t)this) 879 880 881 void nmethod::log_new_nmethod() const { 882 if (LogCompilation && xtty != NULL) { 883 ttyLocker ttyl; 884 HandleMark hm; 885 xtty->begin_elem("nmethod"); 886 log_identity(xtty); 887 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", 888 instructions_begin(), size()); 889 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 890 891 LOG_OFFSET(xtty, relocation); 892 LOG_OFFSET(xtty, code); 893 LOG_OFFSET(xtty, stub); 894 LOG_OFFSET(xtty, consts); 895 LOG_OFFSET(xtty, scopes_data); 896 LOG_OFFSET(xtty, scopes_pcs); 897 LOG_OFFSET(xtty, dependencies); 898 LOG_OFFSET(xtty, handler_table); 899 LOG_OFFSET(xtty, nul_chk_table); 900 LOG_OFFSET(xtty, oops); 901 902 xtty->method(method()); 903 xtty->stamp(); 904 xtty->end_elem(); 905 } 906 } 907 908 #undef LOG_OFFSET 909 910 911 // Print out more verbose output usually for a newly created nmethod. 912 void nmethod::print_on(outputStream* st, const char* title) const { 913 if (st != NULL) { 914 ttyLocker ttyl; 915 // Print a little tag line that looks like +PrintCompilation output: 916 int tlen = (int) strlen(title); 917 bool do_nl = false; 918 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; } 919 st->print("%3d%c %.*s", 920 compile_id(), 921 is_osr_method() ? '%' : 922 method() != NULL && 923 is_native_method() ? 'n' : ' ', 924 tlen, title); 925 #ifdef TIERED 926 st->print(" (%d) ", comp_level()); 927 #endif // TIERED 928 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); 929 if (Universe::heap()->is_gc_active() && method() != NULL) { 930 st->print("(method)"); 931 } else if (method() != NULL) { 932 method()->print_short_name(st); 933 if (is_osr_method()) 934 st->print(" @ %d", osr_entry_bci()); 935 if (method()->code_size() > 0) 936 st->print(" (%d bytes)", method()->code_size()); 937 } 938 939 if (do_nl) st->cr(); 940 } 941 } 942 943 944 void nmethod::print_nmethod(bool printmethod) { 945 ttyLocker ttyl; // keep the following output all in one block 946 if (xtty != NULL) { 947 xtty->begin_head("print_nmethod"); 948 xtty->stamp(); 949 xtty->end_head(); 950 } 951 // print the header part first 952 print(); 953 // then print the requested information 954 if (printmethod) { 955 print_code(); 956 print_pcs(); 957 oop_maps()->print(); 958 } 959 if (PrintDebugInfo) { 960 print_scopes(); 961 } 962 if (PrintRelocations) { 963 print_relocations(); 964 } 965 if (PrintDependencies) { 966 print_dependencies(); 967 } 968 if (PrintExceptionHandlers) { 969 print_handler_table(); 970 print_nul_chk_table(); 971 } 972 if (xtty != NULL) { 973 xtty->tail("print_nmethod"); 974 } 975 } 976 977 978 void nmethod::set_version(int v) { 979 flags.version = v; 980 } 981 982 983 ScopeDesc* nmethod::scope_desc_at(address pc) { 984 PcDesc* pd = pc_desc_at(pc); 985 guarantee(pd != NULL, "scope must be present"); 986 return new ScopeDesc(this, pd->scope_decode_offset(), 987 pd->obj_decode_offset(), pd->should_reexecute()); 988 } 989 990 991 void nmethod::clear_inline_caches() { 992 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 993 if (is_zombie()) { 994 return; 995 } 996 997 RelocIterator iter(this); 998 while (iter.next()) { 999 iter.reloc()->clear_inline_cache(); 1000 } 1001 } 1002 1003 1004 void nmethod::cleanup_inline_caches() { 1005 1006 assert(SafepointSynchronize::is_at_safepoint() && 1007 !CompiledIC_lock->is_locked() && 1008 !Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs"); 1009 1010 // If the method is not entrant or zombie then a JMP is plastered over the 1011 // first few bytes. If an oop in the old code was there, that oop 1012 // should not get GC'd. Skip the first few bytes of oops on 1013 // not-entrant methods. 1014 address low_boundary = verified_entry_point(); 1015 if (!is_in_use()) { 1016 low_boundary += NativeJump::instruction_size; 1017 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1018 // This means that the low_boundary is going to be a little too high. 1019 // This shouldn't matter, since oops of non-entrant methods are never used. 1020 // In fact, why are we bothering to look at oops in a non-entrant method?? 1021 } 1022 1023 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1024 ResourceMark rm; 1025 RelocIterator iter(this, low_boundary); 1026 while(iter.next()) { 1027 switch(iter.type()) { 1028 case relocInfo::virtual_call_type: 1029 case relocInfo::opt_virtual_call_type: { 1030 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1031 // Ok, to lookup references to zombies here 1032 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1033 if( cb != NULL && cb->is_nmethod() ) { 1034 nmethod* nm = (nmethod*)cb; 1035 // Clean inline caches pointing to both zombie and not_entrant methods 1036 if (!nm->is_in_use()) ic->set_to_clean(); 1037 } 1038 break; 1039 } 1040 case relocInfo::static_call_type: { 1041 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1042 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1043 if( cb != NULL && cb->is_nmethod() ) { 1044 nmethod* nm = (nmethod*)cb; 1045 // Clean inline caches pointing to both zombie and not_entrant methods 1046 if (!nm->is_in_use()) csc->set_to_clean(); 1047 } 1048 break; 1049 } 1050 } 1051 } 1052 } 1053 1054 // This is a private interface with the sweeper. 1055 void nmethod::mark_as_seen_on_stack() { 1056 assert(is_not_entrant(), "must be a non-entrant method"); 1057 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1058 } 1059 1060 // Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack) 1061 bool nmethod::can_not_entrant_be_converted() { 1062 assert(is_not_entrant(), "must be a non-entrant method"); 1063 assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint"); 1064 1065 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1066 // count can be greater than the stack traversal count before it hits the 1067 // nmethod for the second time. 1068 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count(); 1069 } 1070 1071 void nmethod::inc_decompile_count() { 1072 // Could be gated by ProfileTraps, but do not bother... 1073 methodOop m = method(); 1074 if (m == NULL) return; 1075 methodDataOop mdo = m->method_data(); 1076 if (mdo == NULL) return; 1077 // There is a benign race here. See comments in methodDataOop.hpp. 1078 mdo->inc_decompile_count(); 1079 } 1080 1081 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1082 1083 post_compiled_method_unload(); 1084 1085 // Since this nmethod is being unloaded, make sure that dependencies 1086 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1087 // indicate that this work is being done during a GC. 1088 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1089 assert(is_alive != NULL, "Should be non-NULL"); 1090 // A non-NULL is_alive closure indicates that this is being called during GC. 1091 flush_dependencies(is_alive); 1092 1093 // Break cycle between nmethod & method 1094 if (TraceClassUnloading && WizardMode) { 1095 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1096 " unloadable], methodOop(" INTPTR_FORMAT 1097 "), cause(" INTPTR_FORMAT ")", 1098 this, (address)_method, (address)cause); 1099 if (!Universe::heap()->is_gc_active()) 1100 cause->klass()->print(); 1101 } 1102 // Unlink the osr method, so we do not look this up again 1103 if (is_osr_method()) { 1104 invalidate_osr_method(); 1105 } 1106 // If _method is already NULL the methodOop is about to be unloaded, 1107 // so we don't have to break the cycle. Note that it is possible to 1108 // have the methodOop live here, in case we unload the nmethod because 1109 // it is pointing to some oop (other than the methodOop) being unloaded. 1110 if (_method != NULL) { 1111 // OSR methods point to the methodOop, but the methodOop does not 1112 // point back! 1113 if (_method->code() == this) { 1114 _method->clear_code(); // Break a cycle 1115 } 1116 inc_decompile_count(); // Last chance to make a mark on the MDO 1117 _method = NULL; // Clear the method of this dead nmethod 1118 } 1119 // Make the class unloaded - i.e., change state and notify sweeper 1120 check_safepoint(); 1121 if (is_in_use()) { 1122 // Transitioning directly from live to unloaded -- so 1123 // we need to force a cache clean-up; remember this 1124 // for later on. 1125 CodeCache::set_needs_cache_clean(true); 1126 } 1127 flags.state = unloaded; 1128 1129 // Log the unloading. 1130 log_state_change(); 1131 1132 // The methodOop is gone at this point 1133 assert(_method == NULL, "Tautology"); 1134 1135 set_osr_link(NULL); 1136 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1137 NMethodSweeper::notify(this); 1138 } 1139 1140 void nmethod::invalidate_osr_method() { 1141 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 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() const { 1150 if (LogCompilation) { 1151 if (xtty != NULL) { 1152 ttyLocker ttyl; // keep the following output all in one block 1153 if (flags.state == unloaded) { 1154 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1155 os::current_thread_id()); 1156 } else { 1157 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1158 os::current_thread_id(), 1159 (flags.state == zombie ? " zombie='1'" : "")); 1160 } 1161 log_identity(xtty); 1162 xtty->stamp(); 1163 xtty->end_elem(); 1164 } 1165 } 1166 if (PrintCompilation && flags.state != unloaded) { 1167 print_on(tty, flags.state == zombie ? "made zombie " : "made not entrant "); 1168 tty->cr(); 1169 } 1170 } 1171 1172 // Common functionality for both make_not_entrant and make_zombie 1173 bool nmethod::make_not_entrant_or_zombie(int state) { 1174 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1175 1176 // If the method is already zombie there is nothing to do 1177 if (is_zombie()) { 1178 return false; 1179 } 1180 1181 // Make sure the nmethod is not flushed in case of a safepoint in code below. 1182 nmethodLocker nml(this); 1183 1184 { 1185 // invalidate osr nmethod before acquiring the patching lock since 1186 // they both acquire leaf locks and we don't want a deadlock. 1187 // This logic is equivalent to the logic below for patching the 1188 // verified entry point of regular methods. 1189 if (is_osr_method()) { 1190 // this effectively makes the osr nmethod not entrant 1191 invalidate_osr_method(); 1192 } 1193 1194 // Enter critical section. Does not block for safepoint. 1195 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1196 1197 if (flags.state == state) { 1198 // another thread already performed this transition so nothing 1199 // to do, but return false to indicate this. 1200 return false; 1201 } 1202 1203 // The caller can be calling the method statically or through an inline 1204 // cache call. 1205 if (!is_osr_method() && !is_not_entrant()) { 1206 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1207 SharedRuntime::get_handle_wrong_method_stub()); 1208 assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, ""); 1209 } 1210 1211 // When the nmethod becomes zombie it is no longer alive so the 1212 // dependencies must be flushed. nmethods in the not_entrant 1213 // state will be flushed later when the transition to zombie 1214 // happens or they get unloaded. 1215 if (state == zombie) { 1216 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); 1217 flush_dependencies(NULL); 1218 } else { 1219 assert(state == not_entrant, "other cases may need to be handled differently"); 1220 } 1221 1222 // Change state 1223 flags.state = state; 1224 1225 // Log the transition once 1226 log_state_change(); 1227 1228 } // leave critical region under Patching_lock 1229 1230 if (state == not_entrant) { 1231 Events::log("Make nmethod not entrant " INTPTR_FORMAT, this); 1232 } else { 1233 Events::log("Make nmethod zombie " INTPTR_FORMAT, this); 1234 } 1235 1236 if (TraceCreateZombies) { 1237 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1238 } 1239 1240 // Make sweeper aware that there is a zombie method that needs to be removed 1241 NMethodSweeper::notify(this); 1242 1243 // not_entrant only stuff 1244 if (state == not_entrant) { 1245 mark_as_seen_on_stack(); 1246 } 1247 1248 // It's a true state change, so mark the method as decompiled. 1249 inc_decompile_count(); 1250 1251 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload event 1252 // and it hasn't already been reported for this nmethod then report it now. 1253 // (the event may have been reported earilier if the GC marked it for unloading). 1254 if (state == zombie) { 1255 1256 DTRACE_METHOD_UNLOAD_PROBE(method()); 1257 1258 if (JvmtiExport::should_post_compiled_method_unload() && 1259 !unload_reported()) { 1260 assert(method() != NULL, "checking"); 1261 { 1262 HandleMark hm; 1263 JvmtiExport::post_compiled_method_unload_at_safepoint( 1264 method()->jmethod_id(), code_begin()); 1265 } 1266 set_unload_reported(); 1267 } 1268 } 1269 1270 1271 // Zombie only stuff 1272 if (state == zombie) { 1273 VTune::delete_nmethod(this); 1274 } 1275 1276 // Check whether method got unloaded at a safepoint before this, 1277 // if so we can skip the flushing steps below 1278 if (method() == NULL) return true; 1279 1280 // Remove nmethod from method. 1281 // We need to check if both the _code and _from_compiled_code_entry_point 1282 // refer to this nmethod because there is a race in setting these two fields 1283 // in methodOop as seen in bugid 4947125. 1284 // If the vep() points to the zombie nmethod, the memory for the nmethod 1285 // could be flushed and the compiler and vtable stubs could still call 1286 // through it. 1287 if (method()->code() == this || 1288 method()->from_compiled_entry() == verified_entry_point()) { 1289 HandleMark hm; 1290 method()->clear_code(); 1291 } 1292 1293 return true; 1294 } 1295 1296 1297 #ifndef PRODUCT 1298 void nmethod::check_safepoint() { 1299 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1300 } 1301 #endif 1302 1303 1304 void nmethod::flush() { 1305 // Note that there are no valid oops in the nmethod anymore. 1306 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1307 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1308 1309 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1310 check_safepoint(); 1311 1312 // completely deallocate this method 1313 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); 1314 if (PrintMethodFlushing) { 1315 tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs()); 1316 } 1317 1318 // We need to deallocate any ExceptionCache data. 1319 // Note that we do not need to grab the nmethod lock for this, it 1320 // better be thread safe if we're disposing of it! 1321 ExceptionCache* ec = exception_cache(); 1322 set_exception_cache(NULL); 1323 while(ec != NULL) { 1324 ExceptionCache* next = ec->next(); 1325 delete ec; 1326 ec = next; 1327 } 1328 1329 if (on_scavenge_root_list()) { 1330 CodeCache::drop_scavenge_root_nmethod(this); 1331 } 1332 1333 ((CodeBlob*)(this))->flush(); 1334 1335 CodeCache::free(this); 1336 } 1337 1338 1339 // 1340 // Notify all classes this nmethod is dependent on that it is no 1341 // longer dependent. This should only be called in two situations. 1342 // First, when a nmethod transitions to a zombie all dependents need 1343 // to be clear. Since zombification happens at a safepoint there's no 1344 // synchronization issues. The second place is a little more tricky. 1345 // During phase 1 of mark sweep class unloading may happen and as a 1346 // result some nmethods may get unloaded. In this case the flushing 1347 // of dependencies must happen during phase 1 since after GC any 1348 // dependencies in the unloaded nmethod won't be updated, so 1349 // traversing the dependency information in unsafe. In that case this 1350 // function is called with a non-NULL argument and this function only 1351 // notifies instanceKlasses that are reachable 1352 1353 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1354 assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); 1355 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1356 "is_alive is non-NULL if and only if we are called during GC"); 1357 if (!has_flushed_dependencies()) { 1358 set_has_flushed_dependencies(); 1359 for (Dependencies::DepStream deps(this); deps.next(); ) { 1360 klassOop klass = deps.context_type(); 1361 if (klass == NULL) continue; // ignore things like evol_method 1362 1363 // During GC the is_alive closure is non-NULL, and is used to 1364 // determine liveness of dependees that need to be updated. 1365 if (is_alive == NULL || is_alive->do_object_b(klass)) { 1366 instanceKlass::cast(klass)->remove_dependent_nmethod(this); 1367 } 1368 } 1369 } 1370 } 1371 1372 1373 // If this oop is not live, the nmethod can be unloaded. 1374 bool nmethod::can_unload(BoolObjectClosure* is_alive, 1375 OopClosure* keep_alive, 1376 oop* root, bool unloading_occurred) { 1377 assert(root != NULL, "just checking"); 1378 oop obj = *root; 1379 if (obj == NULL || is_alive->do_object_b(obj)) { 1380 return false; 1381 } 1382 if (obj->is_compiledICHolder()) { 1383 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); 1384 if (is_alive->do_object_b( 1385 cichk_oop->holder_method()->method_holder()) && 1386 is_alive->do_object_b(cichk_oop->holder_klass())) { 1387 // The oop should be kept alive 1388 keep_alive->do_oop(root); 1389 return false; 1390 } 1391 } 1392 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1393 // simply because one of its constant oops has gone dead. 1394 // No actual classes need to be unloaded in order for this to occur. 1395 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1396 make_unloaded(is_alive, obj); 1397 return true; 1398 } 1399 1400 // ------------------------------------------------------------------ 1401 // post_compiled_method_load_event 1402 // new method for install_code() path 1403 // Transfer information from compilation to jvmti 1404 void nmethod::post_compiled_method_load_event() { 1405 1406 methodOop moop = method(); 1407 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1408 moop->klass_name()->bytes(), 1409 moop->klass_name()->utf8_length(), 1410 moop->name()->bytes(), 1411 moop->name()->utf8_length(), 1412 moop->signature()->bytes(), 1413 moop->signature()->utf8_length(), 1414 code_begin(), code_size()); 1415 1416 if (JvmtiExport::should_post_compiled_method_load()) { 1417 JvmtiExport::post_compiled_method_load(this); 1418 } 1419 } 1420 1421 void nmethod::post_compiled_method_unload() { 1422 assert(_method != NULL && !is_unloaded(), "just checking"); 1423 DTRACE_METHOD_UNLOAD_PROBE(method()); 1424 1425 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1426 // post the event. Sometime later this nmethod will be made a zombie by 1427 // the sweeper but the methodOop will not be valid at that point. 1428 if (JvmtiExport::should_post_compiled_method_unload()) { 1429 assert(!unload_reported(), "already unloaded"); 1430 HandleMark hm; 1431 JvmtiExport::post_compiled_method_unload_at_safepoint( 1432 method()->jmethod_id(), code_begin()); 1433 } 1434 1435 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1436 // any time. As the nmethod is being unloaded now we mark it has 1437 // having the unload event reported - this will ensure that we don't 1438 // attempt to report the event in the unlikely scenario where the 1439 // event is enabled at the time the nmethod is made a zombie. 1440 set_unload_reported(); 1441 } 1442 1443 // This is called at the end of the strong tracing/marking phase of a 1444 // GC to unload an nmethod if it contains otherwise unreachable 1445 // oops. 1446 1447 void nmethod::do_unloading(BoolObjectClosure* is_alive, 1448 OopClosure* keep_alive, bool unloading_occurred) { 1449 // Make sure the oop's ready to receive visitors 1450 assert(!is_zombie() && !is_unloaded(), 1451 "should not call follow on zombie or unloaded nmethod"); 1452 1453 // If the method is not entrant then a JMP is plastered over the 1454 // first few bytes. If an oop in the old code was there, that oop 1455 // should not get GC'd. Skip the first few bytes of oops on 1456 // not-entrant methods. 1457 address low_boundary = verified_entry_point(); 1458 if (is_not_entrant()) { 1459 low_boundary += NativeJump::instruction_size; 1460 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1461 // (See comment above.) 1462 } 1463 1464 // The RedefineClasses() API can cause the class unloading invariant 1465 // to no longer be true. See jvmtiExport.hpp for details. 1466 // Also, leave a debugging breadcrumb in local flag. 1467 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1468 if (a_class_was_redefined) { 1469 // This set of the unloading_occurred flag is done before the 1470 // call to post_compiled_method_unload() so that the unloading 1471 // of this nmethod is reported. 1472 unloading_occurred = true; 1473 } 1474 1475 // Follow methodOop 1476 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { 1477 return; 1478 } 1479 1480 // Exception cache 1481 ExceptionCache* ec = exception_cache(); 1482 while (ec != NULL) { 1483 oop* ex_addr = (oop*)ec->exception_type_addr(); 1484 oop ex = *ex_addr; 1485 ExceptionCache* next_ec = ec->next(); 1486 if (ex != NULL && !is_alive->do_object_b(ex)) { 1487 assert(!ex->is_compiledICHolder(), "Possible error here"); 1488 remove_from_exception_cache(ec); 1489 } 1490 ec = next_ec; 1491 } 1492 1493 // If class unloading occurred we first iterate over all inline caches and 1494 // clear ICs where the cached oop is referring to an unloaded klass or method. 1495 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1496 // iteration below. 1497 if (unloading_occurred) { 1498 RelocIterator iter(this, low_boundary); 1499 while(iter.next()) { 1500 if (iter.type() == relocInfo::virtual_call_type) { 1501 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1502 oop ic_oop = ic->cached_oop(); 1503 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { 1504 // The only exception is compiledICHolder oops which may 1505 // yet be marked below. (We check this further below). 1506 if (ic_oop->is_compiledICHolder()) { 1507 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); 1508 if (is_alive->do_object_b( 1509 cichk_oop->holder_method()->method_holder()) && 1510 is_alive->do_object_b(cichk_oop->holder_klass())) { 1511 continue; 1512 } 1513 } 1514 ic->set_to_clean(); 1515 assert(ic->cached_oop() == NULL, "cached oop in IC should be cleared") 1516 } 1517 } 1518 } 1519 } 1520 1521 // Compiled code 1522 RelocIterator iter(this, low_boundary); 1523 while (iter.next()) { 1524 if (iter.type() == relocInfo::oop_type) { 1525 oop_Relocation* r = iter.oop_reloc(); 1526 // In this loop, we must only traverse those oops directly embedded in 1527 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1528 assert(1 == (r->oop_is_immediate()) + 1529 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1530 "oop must be found in exactly one place"); 1531 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1532 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { 1533 return; 1534 } 1535 } 1536 } 1537 } 1538 1539 1540 // Scopes 1541 for (oop* p = oops_begin(); p < oops_end(); p++) { 1542 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1543 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { 1544 return; 1545 } 1546 } 1547 1548 #ifndef PRODUCT 1549 // This nmethod was not unloaded; check below that all CompiledICs 1550 // refer to marked oops. 1551 { 1552 RelocIterator iter(this, low_boundary); 1553 while (iter.next()) { 1554 if (iter.type() == relocInfo::virtual_call_type) { 1555 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1556 oop ic_oop = ic->cached_oop(); 1557 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), 1558 "Found unmarked ic_oop in reachable nmethod"); 1559 } 1560 } 1561 } 1562 #endif // !PRODUCT 1563 } 1564 1565 // This method is called twice during GC -- once while 1566 // tracing the "active" nmethods on thread stacks during 1567 // the (strong) marking phase, and then again when walking 1568 // the code cache contents during the weak roots processing 1569 // phase. The two uses are distinguished by means of the 1570 // 'do_strong_roots_only' flag, which is true in the first 1571 // case. We want to walk the weak roots in the nmethod 1572 // only in the second case. The weak roots in the nmethod 1573 // are the oops in the ExceptionCache and the InlineCache 1574 // oops. 1575 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { 1576 // make sure the oops ready to receive visitors 1577 assert(!is_zombie() && !is_unloaded(), 1578 "should not call follow on zombie or unloaded nmethod"); 1579 1580 // If the method is not entrant or zombie then a JMP is plastered over the 1581 // first few bytes. If an oop in the old code was there, that oop 1582 // should not get GC'd. Skip the first few bytes of oops on 1583 // not-entrant methods. 1584 address low_boundary = verified_entry_point(); 1585 if (is_not_entrant()) { 1586 low_boundary += NativeJump::instruction_size; 1587 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1588 // (See comment above.) 1589 } 1590 1591 // Compiled code 1592 f->do_oop((oop*) &_method); 1593 if (!do_strong_roots_only) { 1594 // weak roots processing phase -- update ExceptionCache oops 1595 ExceptionCache* ec = exception_cache(); 1596 while(ec != NULL) { 1597 f->do_oop((oop*)ec->exception_type_addr()); 1598 ec = ec->next(); 1599 } 1600 } // Else strong roots phase -- skip oops in ExceptionCache 1601 1602 RelocIterator iter(this, low_boundary); 1603 1604 while (iter.next()) { 1605 if (iter.type() == relocInfo::oop_type ) { 1606 oop_Relocation* r = iter.oop_reloc(); 1607 // In this loop, we must only follow those oops directly embedded in 1608 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1609 assert(1 == (r->oop_is_immediate()) + 1610 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1611 "oop must be found in exactly one place"); 1612 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1613 f->do_oop(r->oop_addr()); 1614 } 1615 } 1616 } 1617 1618 // Scopes 1619 // This includes oop constants not inlined in the code stream. 1620 for (oop* p = oops_begin(); p < oops_end(); p++) { 1621 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1622 f->do_oop(p); 1623 } 1624 } 1625 1626 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1627 1628 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1629 1630 // An nmethod is "marked" if its _mark_link is set non-null. 1631 // Even if it is the end of the linked list, it will have a non-null link value, 1632 // as long as it is on the list. 1633 // This code must be MP safe, because it is used from parallel GC passes. 1634 bool nmethod::test_set_oops_do_mark() { 1635 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1636 nmethod* observed_mark_link = _oops_do_mark_link; 1637 if (observed_mark_link == NULL) { 1638 // Claim this nmethod for this thread to mark. 1639 observed_mark_link = (nmethod*) 1640 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1641 if (observed_mark_link == NULL) { 1642 1643 // Atomically append this nmethod (now claimed) to the head of the list: 1644 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1645 for (;;) { 1646 nmethod* required_mark_nmethods = observed_mark_nmethods; 1647 _oops_do_mark_link = required_mark_nmethods; 1648 observed_mark_nmethods = (nmethod*) 1649 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1650 if (observed_mark_nmethods == required_mark_nmethods) 1651 break; 1652 } 1653 // Mark was clear when we first saw this guy. 1654 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n")); 1655 return false; 1656 } 1657 } 1658 // On fall through, another racing thread marked this nmethod before we did. 1659 return true; 1660 } 1661 1662 void nmethod::oops_do_marking_prologue() { 1663 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 1664 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1665 // We use cmpxchg_ptr instead of regular assignment here because the user 1666 // may fork a bunch of threads, and we need them all to see the same state. 1667 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1668 guarantee(observed == NULL, "no races in this sequential code"); 1669 } 1670 1671 void nmethod::oops_do_marking_epilogue() { 1672 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1673 nmethod* cur = _oops_do_mark_nmethods; 1674 while (cur != NMETHOD_SENTINEL) { 1675 assert(cur != NULL, "not NULL-terminated"); 1676 nmethod* next = cur->_oops_do_mark_link; 1677 cur->_oops_do_mark_link = NULL; 1678 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n")); 1679 cur = next; 1680 } 1681 void* required = _oops_do_mark_nmethods; 1682 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1683 guarantee(observed == required, "no races in this sequential code"); 1684 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 1685 } 1686 1687 class DetectScavengeRoot: public OopClosure { 1688 bool _detected_scavenge_root; 1689 public: 1690 DetectScavengeRoot() : _detected_scavenge_root(false) 1691 { NOT_PRODUCT(_print_nm = NULL); } 1692 bool detected_scavenge_root() { return _detected_scavenge_root; } 1693 virtual void do_oop(oop* p) { 1694 if ((*p) != NULL && (*p)->is_scavengable()) { 1695 NOT_PRODUCT(maybe_print(p)); 1696 _detected_scavenge_root = true; 1697 } 1698 } 1699 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1700 1701 #ifndef PRODUCT 1702 nmethod* _print_nm; 1703 void maybe_print(oop* p) { 1704 if (_print_nm == NULL) return; 1705 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1706 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")", 1707 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 1708 (intptr_t)(*p), (intptr_t)p); 1709 (*p)->print(); 1710 } 1711 #endif //PRODUCT 1712 }; 1713 1714 bool nmethod::detect_scavenge_root_oops() { 1715 DetectScavengeRoot detect_scavenge_root; 1716 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1717 oops_do(&detect_scavenge_root); 1718 return detect_scavenge_root.detected_scavenge_root(); 1719 } 1720 1721 // Method that knows how to preserve outgoing arguments at call. This method must be 1722 // called with a frame corresponding to a Java invoke 1723 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 1724 if (!method()->is_native()) { 1725 SimpleScopeDesc ssd(this, fr.pc()); 1726 Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci()); 1727 bool has_receiver = call->has_receiver(); 1728 symbolOop signature = call->signature(); 1729 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f); 1730 } 1731 } 1732 1733 1734 oop nmethod::embeddedOop_at(u_char* p) { 1735 RelocIterator iter(this, p, p + oopSize); 1736 while (iter.next()) 1737 if (iter.type() == relocInfo::oop_type) { 1738 return iter.oop_reloc()->oop_value(); 1739 } 1740 return NULL; 1741 } 1742 1743 1744 inline bool includes(void* p, void* from, void* to) { 1745 return from <= p && p < to; 1746 } 1747 1748 1749 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1750 assert(count >= 2, "must be sentinel values, at least"); 1751 1752 #ifdef ASSERT 1753 // must be sorted and unique; we do a binary search in find_pc_desc() 1754 int prev_offset = pcs[0].pc_offset(); 1755 assert(prev_offset == PcDesc::lower_offset_limit, 1756 "must start with a sentinel"); 1757 for (int i = 1; i < count; i++) { 1758 int this_offset = pcs[i].pc_offset(); 1759 assert(this_offset > prev_offset, "offsets must be sorted"); 1760 prev_offset = this_offset; 1761 } 1762 assert(prev_offset == PcDesc::upper_offset_limit, 1763 "must end with a sentinel"); 1764 #endif //ASSERT 1765 1766 // Search for MethodHandle invokes and tag the nmethod. 1767 for (int i = 0; i < count; i++) { 1768 if (pcs[i].is_method_handle_invoke()) { 1769 set_has_method_handle_invokes(true); 1770 break; 1771 } 1772 } 1773 1774 int size = count * sizeof(PcDesc); 1775 assert(scopes_pcs_size() >= size, "oob"); 1776 memcpy(scopes_pcs_begin(), pcs, size); 1777 1778 // Adjust the final sentinel downward. 1779 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1780 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1781 last_pc->set_pc_offset(instructions_size() + 1); 1782 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1783 // Fill any rounding gaps with copies of the last record. 1784 last_pc[1] = last_pc[0]; 1785 } 1786 // The following assert could fail if sizeof(PcDesc) is not 1787 // an integral multiple of oopSize (the rounding term). 1788 // If it fails, change the logic to always allocate a multiple 1789 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1790 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1791 } 1792 1793 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1794 assert(scopes_data_size() >= size, "oob"); 1795 memcpy(scopes_data_begin(), buffer, size); 1796 } 1797 1798 1799 #ifdef ASSERT 1800 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 1801 PcDesc* lower = nm->scopes_pcs_begin(); 1802 PcDesc* upper = nm->scopes_pcs_end(); 1803 lower += 1; // exclude initial sentinel 1804 PcDesc* res = NULL; 1805 for (PcDesc* p = lower; p < upper; p++) { 1806 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1807 if (match_desc(p, pc_offset, approximate)) { 1808 if (res == NULL) 1809 res = p; 1810 else 1811 res = (PcDesc*) badAddress; 1812 } 1813 } 1814 return res; 1815 } 1816 #endif 1817 1818 1819 // Finds a PcDesc with real-pc equal to "pc" 1820 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 1821 address base_address = instructions_begin(); 1822 if ((pc < base_address) || 1823 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1824 return NULL; // PC is wildly out of range 1825 } 1826 int pc_offset = (int) (pc - base_address); 1827 1828 // Check the PcDesc cache if it contains the desired PcDesc 1829 // (This as an almost 100% hit rate.) 1830 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1831 if (res != NULL) { 1832 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 1833 return res; 1834 } 1835 1836 // Fallback algorithm: quasi-linear search for the PcDesc 1837 // Find the last pc_offset less than the given offset. 1838 // The successor must be the required match, if there is a match at all. 1839 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1840 PcDesc* lower = scopes_pcs_begin(); 1841 PcDesc* upper = scopes_pcs_end(); 1842 upper -= 1; // exclude final sentinel 1843 if (lower >= upper) return NULL; // native method; no PcDescs at all 1844 1845 #define assert_LU_OK \ 1846 /* invariant on lower..upper during the following search: */ \ 1847 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1848 assert(upper->pc_offset() >= pc_offset, "sanity") 1849 assert_LU_OK; 1850 1851 // Use the last successful return as a split point. 1852 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1853 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1854 if (mid->pc_offset() < pc_offset) { 1855 lower = mid; 1856 } else { 1857 upper = mid; 1858 } 1859 1860 // Take giant steps at first (4096, then 256, then 16, then 1) 1861 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1862 const int RADIX = (1 << LOG2_RADIX); 1863 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1864 while ((mid = lower + step) < upper) { 1865 assert_LU_OK; 1866 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1867 if (mid->pc_offset() < pc_offset) { 1868 lower = mid; 1869 } else { 1870 upper = mid; 1871 break; 1872 } 1873 } 1874 assert_LU_OK; 1875 } 1876 1877 // Sneak up on the value with a linear search of length ~16. 1878 while (true) { 1879 assert_LU_OK; 1880 mid = lower + 1; 1881 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 1882 if (mid->pc_offset() < pc_offset) { 1883 lower = mid; 1884 } else { 1885 upper = mid; 1886 break; 1887 } 1888 } 1889 #undef assert_LU_OK 1890 1891 if (match_desc(upper, pc_offset, approximate)) { 1892 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 1893 _pc_desc_cache.add_pc_desc(upper); 1894 return upper; 1895 } else { 1896 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 1897 return NULL; 1898 } 1899 } 1900 1901 1902 bool nmethod::check_all_dependencies() { 1903 bool found_check = false; 1904 // wholesale check of all dependencies 1905 for (Dependencies::DepStream deps(this); deps.next(); ) { 1906 if (deps.check_dependency() != NULL) { 1907 found_check = true; 1908 NOT_DEBUG(break); 1909 } 1910 } 1911 return found_check; // tell caller if we found anything 1912 } 1913 1914 bool nmethod::check_dependency_on(DepChange& changes) { 1915 // What has happened: 1916 // 1) a new class dependee has been added 1917 // 2) dependee and all its super classes have been marked 1918 bool found_check = false; // set true if we are upset 1919 for (Dependencies::DepStream deps(this); deps.next(); ) { 1920 // Evaluate only relevant dependencies. 1921 if (deps.spot_check_dependency_at(changes) != NULL) { 1922 found_check = true; 1923 NOT_DEBUG(break); 1924 } 1925 } 1926 return found_check; 1927 } 1928 1929 bool nmethod::is_evol_dependent_on(klassOop dependee) { 1930 instanceKlass *dependee_ik = instanceKlass::cast(dependee); 1931 objArrayOop dependee_methods = dependee_ik->methods(); 1932 for (Dependencies::DepStream deps(this); deps.next(); ) { 1933 if (deps.type() == Dependencies::evol_method) { 1934 methodOop method = deps.method_argument(0); 1935 for (int j = 0; j < dependee_methods->length(); j++) { 1936 if ((methodOop) dependee_methods->obj_at(j) == method) { 1937 // RC_TRACE macro has an embedded ResourceMark 1938 RC_TRACE(0x01000000, 1939 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1940 _method->method_holder()->klass_part()->external_name(), 1941 _method->name()->as_C_string(), 1942 _method->signature()->as_C_string(), compile_id(), 1943 method->method_holder()->klass_part()->external_name(), 1944 method->name()->as_C_string(), 1945 method->signature()->as_C_string())); 1946 if (TraceDependencies || LogCompilation) 1947 deps.log_dependency(dependee); 1948 return true; 1949 } 1950 } 1951 } 1952 } 1953 return false; 1954 } 1955 1956 // Called from mark_for_deoptimization, when dependee is invalidated. 1957 bool nmethod::is_dependent_on_method(methodOop dependee) { 1958 for (Dependencies::DepStream deps(this); deps.next(); ) { 1959 if (deps.type() != Dependencies::evol_method) 1960 continue; 1961 methodOop method = deps.method_argument(0); 1962 if (method == dependee) return true; 1963 } 1964 return false; 1965 } 1966 1967 1968 bool nmethod::is_patchable_at(address instr_addr) { 1969 assert (code_contains(instr_addr), "wrong nmethod used"); 1970 if (is_zombie()) { 1971 // a zombie may never be patched 1972 return false; 1973 } 1974 return true; 1975 } 1976 1977 1978 address nmethod::continuation_for_implicit_exception(address pc) { 1979 // Exception happened outside inline-cache check code => we are inside 1980 // an active nmethod => use cpc to determine a return address 1981 int exception_offset = pc - instructions_begin(); 1982 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 1983 #ifdef ASSERT 1984 if (cont_offset == 0) { 1985 Thread* thread = ThreadLocalStorage::get_thread_slow(); 1986 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 1987 HandleMark hm(thread); 1988 ResourceMark rm(thread); 1989 CodeBlob* cb = CodeCache::find_blob(pc); 1990 assert(cb != NULL && cb == this, ""); 1991 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 1992 print(); 1993 method()->print_codes(); 1994 print_code(); 1995 print_pcs(); 1996 } 1997 #endif 1998 guarantee(cont_offset != 0, "unhandled implicit exception in compiled code"); 1999 return instructions_begin() + cont_offset; 2000 } 2001 2002 2003 2004 void nmethod_init() { 2005 // make sure you didn't forget to adjust the filler fields 2006 assert(sizeof(nmFlags) <= 4, "nmFlags occupies more than a word"); 2007 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2008 } 2009 2010 2011 //------------------------------------------------------------------------------------------- 2012 2013 2014 // QQQ might we make this work from a frame?? 2015 nmethodLocker::nmethodLocker(address pc) { 2016 CodeBlob* cb = CodeCache::find_blob(pc); 2017 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2018 _nm = (nmethod*)cb; 2019 lock_nmethod(_nm); 2020 } 2021 2022 void nmethodLocker::lock_nmethod(nmethod* nm) { 2023 if (nm == NULL) return; 2024 Atomic::inc(&nm->_lock_count); 2025 guarantee(!nm->is_zombie(), "cannot lock a zombie method"); 2026 } 2027 2028 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2029 if (nm == NULL) return; 2030 Atomic::dec(&nm->_lock_count); 2031 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2032 } 2033 2034 bool nmethod::is_deopt_pc(address pc) { 2035 bool ret = pc == deopt_handler_begin(); 2036 return ret; 2037 } 2038 2039 2040 // ----------------------------------------------------------------------------- 2041 // MethodHandle 2042 2043 bool nmethod::is_method_handle_return(address return_pc) { 2044 if (!has_method_handle_invokes()) return false; 2045 PcDesc* pd = pc_desc_at(return_pc); 2046 if (pd == NULL) 2047 return false; 2048 return pd->is_method_handle_invoke(); 2049 } 2050 2051 2052 // ----------------------------------------------------------------------------- 2053 // Verification 2054 2055 class VerifyOopsClosure: public OopClosure { 2056 nmethod* _nm; 2057 bool _ok; 2058 public: 2059 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2060 bool ok() { return _ok; } 2061 virtual void do_oop(oop* p) { 2062 if ((*p) == NULL || (*p)->is_oop()) return; 2063 if (_ok) { 2064 _nm->print_nmethod(true); 2065 _ok = false; 2066 } 2067 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2068 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2069 } 2070 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2071 }; 2072 2073 void nmethod::verify() { 2074 2075 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2076 // seems odd. 2077 2078 if( is_zombie() || is_not_entrant() ) 2079 return; 2080 2081 // Make sure all the entry points are correctly aligned for patching. 2082 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2083 2084 assert(method()->is_oop(), "must be valid"); 2085 2086 ResourceMark rm; 2087 2088 if (!CodeCache::contains(this)) { 2089 fatal1("nmethod at " INTPTR_FORMAT " not in zone", this); 2090 } 2091 2092 if(is_native_method() ) 2093 return; 2094 2095 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2096 if (nm != this) { 2097 fatal1("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", this); 2098 } 2099 2100 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2101 if (! p->verify(this)) { 2102 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2103 } 2104 } 2105 2106 VerifyOopsClosure voc(this); 2107 oops_do(&voc); 2108 assert(voc.ok(), "embedded oops must be OK"); 2109 verify_scavenge_root_oops(); 2110 2111 verify_scopes(); 2112 } 2113 2114 2115 void nmethod::verify_interrupt_point(address call_site) { 2116 // This code does not work in release mode since 2117 // owns_lock only is available in debug mode. 2118 CompiledIC* ic = NULL; 2119 Thread *cur = Thread::current(); 2120 if (CompiledIC_lock->owner() == cur || 2121 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2122 SafepointSynchronize::is_at_safepoint())) { 2123 ic = CompiledIC_at(call_site); 2124 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2125 } else { 2126 MutexLocker ml_verify (CompiledIC_lock); 2127 ic = CompiledIC_at(call_site); 2128 } 2129 PcDesc* pd = pc_desc_at(ic->end_of_call()); 2130 assert(pd != NULL, "PcDesc must exist"); 2131 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2132 pd->obj_decode_offset(), pd->should_reexecute()); 2133 !sd->is_top(); sd = sd->sender()) { 2134 sd->verify(); 2135 } 2136 } 2137 2138 void nmethod::verify_scopes() { 2139 if( !method() ) return; // Runtime stubs have no scope 2140 if (method()->is_native()) return; // Ignore stub methods. 2141 // iterate through all interrupt point 2142 // and verify the debug information is valid. 2143 RelocIterator iter((nmethod*)this); 2144 while (iter.next()) { 2145 address stub = NULL; 2146 switch (iter.type()) { 2147 case relocInfo::virtual_call_type: 2148 verify_interrupt_point(iter.addr()); 2149 break; 2150 case relocInfo::opt_virtual_call_type: 2151 stub = iter.opt_virtual_call_reloc()->static_stub(); 2152 verify_interrupt_point(iter.addr()); 2153 break; 2154 case relocInfo::static_call_type: 2155 stub = iter.static_call_reloc()->static_stub(); 2156 //verify_interrupt_point(iter.addr()); 2157 break; 2158 case relocInfo::runtime_call_type: 2159 address destination = iter.reloc()->value(); 2160 // Right now there is no way to find out which entries support 2161 // an interrupt point. It would be nice if we had this 2162 // information in a table. 2163 break; 2164 } 2165 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2166 } 2167 } 2168 2169 2170 // ----------------------------------------------------------------------------- 2171 // Non-product code 2172 #ifndef PRODUCT 2173 2174 class DebugScavengeRoot: public OopClosure { 2175 nmethod* _nm; 2176 bool _ok; 2177 public: 2178 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2179 bool ok() { return _ok; } 2180 virtual void do_oop(oop* p) { 2181 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2182 if (_ok) { 2183 _nm->print_nmethod(true); 2184 _ok = false; 2185 } 2186 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2187 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2188 (*p)->print(); 2189 } 2190 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2191 }; 2192 2193 void nmethod::verify_scavenge_root_oops() { 2194 if (!on_scavenge_root_list()) { 2195 // Actually look inside, to verify the claim that it's clean. 2196 DebugScavengeRoot debug_scavenge_root(this); 2197 oops_do(&debug_scavenge_root); 2198 if (!debug_scavenge_root.ok()) 2199 fatal("found an unadvertised bad non-perm oop in the code cache"); 2200 } 2201 assert(scavenge_root_not_marked(), ""); 2202 } 2203 2204 #endif // PRODUCT 2205 2206 // Printing operations 2207 2208 void nmethod::print() const { 2209 ResourceMark rm; 2210 ttyLocker ttyl; // keep the following output all in one block 2211 2212 tty->print("Compiled "); 2213 2214 if (is_compiled_by_c1()) { 2215 tty->print("(c1) "); 2216 } else if (is_compiled_by_c2()) { 2217 tty->print("(c2) "); 2218 } else { 2219 tty->print("(nm) "); 2220 } 2221 2222 print_on(tty, "nmethod"); 2223 tty->cr(); 2224 if (WizardMode) { 2225 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2226 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2227 tty->print(" { "); 2228 if (version()) tty->print("v%d ", version()); 2229 if (level()) tty->print("l%d ", level()); 2230 if (is_in_use()) tty->print("in_use "); 2231 if (is_not_entrant()) tty->print("not_entrant "); 2232 if (is_zombie()) tty->print("zombie "); 2233 if (is_unloaded()) tty->print("unloaded "); 2234 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2235 tty->print_cr("}:"); 2236 } 2237 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2238 (address)this, 2239 (address)this + size(), 2240 size()); 2241 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2242 relocation_begin(), 2243 relocation_end(), 2244 relocation_size()); 2245 if (code_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2246 code_begin(), 2247 code_end(), 2248 code_size()); 2249 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2250 stub_begin(), 2251 stub_end(), 2252 stub_size()); 2253 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2254 consts_begin(), 2255 consts_end(), 2256 consts_size()); 2257 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2258 scopes_data_begin(), 2259 scopes_data_end(), 2260 scopes_data_size()); 2261 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2262 scopes_pcs_begin(), 2263 scopes_pcs_end(), 2264 scopes_pcs_size()); 2265 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2266 dependencies_begin(), 2267 dependencies_end(), 2268 dependencies_size()); 2269 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2270 handler_table_begin(), 2271 handler_table_end(), 2272 handler_table_size()); 2273 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2274 nul_chk_table_begin(), 2275 nul_chk_table_end(), 2276 nul_chk_table_size()); 2277 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2278 oops_begin(), 2279 oops_end(), 2280 oops_size()); 2281 } 2282 2283 void nmethod::print_code() { 2284 HandleMark hm; 2285 ResourceMark m; 2286 Disassembler::decode(this); 2287 } 2288 2289 2290 #ifndef PRODUCT 2291 2292 void nmethod::print_scopes() { 2293 // Find the first pc desc for all scopes in the code and print it. 2294 ResourceMark rm; 2295 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2296 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2297 continue; 2298 2299 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2300 sd->print_on(tty, p); 2301 } 2302 } 2303 2304 void nmethod::print_dependencies() { 2305 ResourceMark rm; 2306 ttyLocker ttyl; // keep the following output all in one block 2307 tty->print_cr("Dependencies:"); 2308 for (Dependencies::DepStream deps(this); deps.next(); ) { 2309 deps.print_dependency(); 2310 klassOop ctxk = deps.context_type(); 2311 if (ctxk != NULL) { 2312 Klass* k = Klass::cast(ctxk); 2313 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { 2314 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); 2315 } 2316 } 2317 deps.log_dependency(); // put it into the xml log also 2318 } 2319 } 2320 2321 2322 void nmethod::print_relocations() { 2323 ResourceMark m; // in case methods get printed via the debugger 2324 tty->print_cr("relocations:"); 2325 RelocIterator iter(this); 2326 iter.print(); 2327 if (UseRelocIndex) { 2328 jint* index_end = (jint*)relocation_end() - 1; 2329 jint index_size = *index_end; 2330 jint* index_start = (jint*)( (address)index_end - index_size ); 2331 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2332 if (index_size > 0) { 2333 jint* ip; 2334 for (ip = index_start; ip+2 <= index_end; ip += 2) 2335 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2336 ip[0], 2337 ip[1], 2338 header_end()+ip[0], 2339 relocation_begin()-1+ip[1]); 2340 for (; ip < index_end; ip++) 2341 tty->print_cr(" (%d ?)", ip[0]); 2342 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); 2343 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2344 } 2345 } 2346 } 2347 2348 2349 void nmethod::print_pcs() { 2350 ResourceMark m; // in case methods get printed via debugger 2351 tty->print_cr("pc-bytecode offsets:"); 2352 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2353 p->print(this); 2354 } 2355 } 2356 2357 #endif // PRODUCT 2358 2359 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2360 RelocIterator iter(this, begin, end); 2361 bool have_one = false; 2362 while (iter.next()) { 2363 have_one = true; 2364 switch (iter.type()) { 2365 case relocInfo::none: return "no_reloc"; 2366 case relocInfo::oop_type: { 2367 stringStream st; 2368 oop_Relocation* r = iter.oop_reloc(); 2369 oop obj = r->oop_value(); 2370 st.print("oop("); 2371 if (obj == NULL) st.print("NULL"); 2372 else obj->print_value_on(&st); 2373 st.print(")"); 2374 return st.as_string(); 2375 } 2376 case relocInfo::virtual_call_type: return "virtual_call"; 2377 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2378 case relocInfo::static_call_type: return "static_call"; 2379 case relocInfo::static_stub_type: return "static_stub"; 2380 case relocInfo::runtime_call_type: return "runtime_call"; 2381 case relocInfo::external_word_type: return "external_word"; 2382 case relocInfo::internal_word_type: return "internal_word"; 2383 case relocInfo::section_word_type: return "section_word"; 2384 case relocInfo::poll_type: return "poll"; 2385 case relocInfo::poll_return_type: return "poll_return"; 2386 case relocInfo::type_mask: return "type_bit_mask"; 2387 } 2388 } 2389 return have_one ? "other" : NULL; 2390 } 2391 2392 // Return a the last scope in (begin..end] 2393 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2394 PcDesc* p = pc_desc_near(begin+1); 2395 if (p != NULL && p->real_pc(this) <= end) { 2396 return new ScopeDesc(this, p->scope_decode_offset(), 2397 p->obj_decode_offset(), p->should_reexecute()); 2398 } 2399 return NULL; 2400 } 2401 2402 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2403 // First, find an oopmap in (begin, end]. 2404 // We use the odd half-closed interval so that oop maps and scope descs 2405 // which are tied to the byte after a call are printed with the call itself. 2406 address base = instructions_begin(); 2407 OopMapSet* oms = oop_maps(); 2408 if (oms != NULL) { 2409 for (int i = 0, imax = oms->size(); i < imax; i++) { 2410 OopMap* om = oms->at(i); 2411 address pc = base + om->offset(); 2412 if (pc > begin) { 2413 if (pc <= end) { 2414 st->move_to(column); 2415 st->print("; "); 2416 om->print_on(st); 2417 } 2418 break; 2419 } 2420 } 2421 } 2422 2423 // Print any debug info present at this pc. 2424 ScopeDesc* sd = scope_desc_in(begin, end); 2425 if (sd != NULL) { 2426 st->move_to(column); 2427 if (sd->bci() == SynchronizationEntryBCI) { 2428 st->print(";*synchronization entry"); 2429 } else { 2430 if (sd->method().is_null()) { 2431 st->print("method is NULL"); 2432 } else if (sd->method()->is_native()) { 2433 st->print("method is native"); 2434 } else { 2435 address bcp = sd->method()->bcp_from(sd->bci()); 2436 Bytecodes::Code bc = Bytecodes::java_code_at(bcp); 2437 st->print(";*%s", Bytecodes::name(bc)); 2438 switch (bc) { 2439 case Bytecodes::_invokevirtual: 2440 case Bytecodes::_invokespecial: 2441 case Bytecodes::_invokestatic: 2442 case Bytecodes::_invokeinterface: 2443 { 2444 Bytecode_invoke* invoke = Bytecode_invoke_at(sd->method(), sd->bci()); 2445 st->print(" "); 2446 if (invoke->name() != NULL) 2447 invoke->name()->print_symbol_on(st); 2448 else 2449 st->print("<UNKNOWN>"); 2450 break; 2451 } 2452 case Bytecodes::_getfield: 2453 case Bytecodes::_putfield: 2454 case Bytecodes::_getstatic: 2455 case Bytecodes::_putstatic: 2456 { 2457 methodHandle sdm = sd->method(); 2458 Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci())); 2459 constantPoolOop sdmc = sdm->constants(); 2460 symbolOop name = sdmc->name_ref_at(field->index()); 2461 st->print(" "); 2462 if (name != NULL) 2463 name->print_symbol_on(st); 2464 else 2465 st->print("<UNKNOWN>"); 2466 } 2467 } 2468 } 2469 } 2470 2471 // Print all scopes 2472 for (;sd != NULL; sd = sd->sender()) { 2473 st->move_to(column); 2474 st->print("; -"); 2475 if (sd->method().is_null()) { 2476 st->print("method is NULL"); 2477 } else { 2478 sd->method()->print_short_name(st); 2479 } 2480 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2481 if (lineno != -1) { 2482 st->print("@%d (line %d)", sd->bci(), lineno); 2483 } else { 2484 st->print("@%d", sd->bci()); 2485 } 2486 st->cr(); 2487 } 2488 } 2489 2490 // Print relocation information 2491 const char* str = reloc_string_for(begin, end); 2492 if (str != NULL) { 2493 if (sd != NULL) st->cr(); 2494 st->move_to(column); 2495 st->print("; {%s}", str); 2496 } 2497 int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin()); 2498 if (cont_offset != 0) { 2499 st->move_to(column); 2500 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset); 2501 } 2502 2503 } 2504 2505 #ifndef PRODUCT 2506 2507 void nmethod::print_value_on(outputStream* st) const { 2508 print_on(st, "nmethod"); 2509 } 2510 2511 void nmethod::print_calls(outputStream* st) { 2512 RelocIterator iter(this); 2513 while (iter.next()) { 2514 switch (iter.type()) { 2515 case relocInfo::virtual_call_type: 2516 case relocInfo::opt_virtual_call_type: { 2517 VerifyMutexLocker mc(CompiledIC_lock); 2518 CompiledIC_at(iter.reloc())->print(); 2519 break; 2520 } 2521 case relocInfo::static_call_type: 2522 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 2523 compiledStaticCall_at(iter.reloc())->print(); 2524 break; 2525 } 2526 } 2527 } 2528 2529 void nmethod::print_handler_table() { 2530 ExceptionHandlerTable(this).print(); 2531 } 2532 2533 void nmethod::print_nul_chk_table() { 2534 ImplicitExceptionTable(this).print(instructions_begin()); 2535 } 2536 2537 void nmethod::print_statistics() { 2538 ttyLocker ttyl; 2539 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2540 nmethod_stats.print_native_nmethod_stats(); 2541 nmethod_stats.print_nmethod_stats(); 2542 DebugInformationRecorder::print_statistics(); 2543 nmethod_stats.print_pc_stats(); 2544 Dependencies::print_statistics(); 2545 if (xtty != NULL) xtty->tail("statistics"); 2546 } 2547 2548 #endif // PRODUCT