1 /* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/nmethod.hpp" 29 #include "code/scopeDesc.hpp" 30 #include "compiler/abstractCompiler.hpp" 31 #include "compiler/compileLog.hpp" 32 #include "compiler/compilerOracle.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/bytecode.hpp" 35 #include "oops/methodDataOop.hpp" 36 #include "prims/jvmtiRedefineClassesTrace.hpp" 37 #include "prims/jvmtiImpl.hpp" 38 #include "runtime/sharedRuntime.hpp" 39 #include "runtime/sweeper.hpp" 40 #include "utilities/dtrace.hpp" 41 #include "utilities/events.hpp" 42 #include "utilities/xmlstream.hpp" 43 #ifdef SHARK 44 #include "shark/sharkCompiler.hpp" 45 #endif 46 47 #ifdef DTRACE_ENABLED 48 49 // Only bother with this argument setup if dtrace is available 50 51 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, 52 const char*, int, const char*, int, const char*, int, void*, size_t); 53 54 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, 55 char*, int, char*, int, char*, int); 56 57 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 58 { \ 59 methodOop m = (method); \ 60 if (m != NULL) { \ 61 Symbol* klass_name = m->klass_name(); \ 62 Symbol* name = m->name(); \ 63 Symbol* signature = m->signature(); \ 64 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ 65 klass_name->bytes(), klass_name->utf8_length(), \ 66 name->bytes(), name->utf8_length(), \ 67 signature->bytes(), signature->utf8_length()); \ 68 } \ 69 } 70 71 #else // ndef DTRACE_ENABLED 72 73 #define DTRACE_METHOD_UNLOAD_PROBE(method) 74 75 #endif 76 77 bool nmethod::is_compiled_by_c1() const { 78 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 79 if (is_native_method()) return false; 80 return compiler()->is_c1(); 81 } 82 bool nmethod::is_compiled_by_c2() const { 83 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 84 if (is_native_method()) return false; 85 return compiler()->is_c2(); 86 } 87 bool nmethod::is_compiled_by_shark() const { 88 if (is_native_method()) return false; 89 assert(compiler() != NULL, "must be"); 90 return compiler()->is_shark(); 91 } 92 93 94 95 //--------------------------------------------------------------------------------- 96 // NMethod statistics 97 // They are printed under various flags, including: 98 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 99 // (In the latter two cases, they like other stats are printed to the log only.) 100 101 #ifndef PRODUCT 102 // These variables are put into one block to reduce relocations 103 // and make it simpler to print from the debugger. 104 static 105 struct nmethod_stats_struct { 106 int nmethod_count; 107 int total_size; 108 int relocation_size; 109 int consts_size; 110 int insts_size; 111 int stub_size; 112 int scopes_data_size; 113 int scopes_pcs_size; 114 int dependencies_size; 115 int handler_table_size; 116 int nul_chk_table_size; 117 int oops_size; 118 119 void note_nmethod(nmethod* nm) { 120 nmethod_count += 1; 121 total_size += nm->size(); 122 relocation_size += nm->relocation_size(); 123 consts_size += nm->consts_size(); 124 insts_size += nm->insts_size(); 125 stub_size += nm->stub_size(); 126 oops_size += nm->oops_size(); 127 scopes_data_size += nm->scopes_data_size(); 128 scopes_pcs_size += nm->scopes_pcs_size(); 129 dependencies_size += nm->dependencies_size(); 130 handler_table_size += nm->handler_table_size(); 131 nul_chk_table_size += nm->nul_chk_table_size(); 132 } 133 void print_nmethod_stats() { 134 if (nmethod_count == 0) return; 135 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 136 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 137 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 138 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 139 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 140 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 141 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 142 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 143 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 144 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 145 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 146 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 147 } 148 149 int native_nmethod_count; 150 int native_total_size; 151 int native_relocation_size; 152 int native_insts_size; 153 int native_oops_size; 154 void note_native_nmethod(nmethod* nm) { 155 native_nmethod_count += 1; 156 native_total_size += nm->size(); 157 native_relocation_size += nm->relocation_size(); 158 native_insts_size += nm->insts_size(); 159 native_oops_size += nm->oops_size(); 160 } 161 void print_native_nmethod_stats() { 162 if (native_nmethod_count == 0) return; 163 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 164 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 165 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 166 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 167 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 168 } 169 170 int pc_desc_resets; // number of resets (= number of caches) 171 int pc_desc_queries; // queries to nmethod::find_pc_desc 172 int pc_desc_approx; // number of those which have approximate true 173 int pc_desc_repeats; // number of _pc_descs[0] hits 174 int pc_desc_hits; // number of LRU cache hits 175 int pc_desc_tests; // total number of PcDesc examinations 176 int pc_desc_searches; // total number of quasi-binary search steps 177 int pc_desc_adds; // number of LUR cache insertions 178 179 void print_pc_stats() { 180 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 181 pc_desc_queries, 182 (double)(pc_desc_tests + pc_desc_searches) 183 / pc_desc_queries); 184 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 185 pc_desc_resets, 186 pc_desc_queries, pc_desc_approx, 187 pc_desc_repeats, pc_desc_hits, 188 pc_desc_tests, pc_desc_searches, pc_desc_adds); 189 } 190 } nmethod_stats; 191 #endif //PRODUCT 192 193 194 //--------------------------------------------------------------------------------- 195 196 197 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 198 assert(pc != NULL, "Must be non null"); 199 assert(exception.not_null(), "Must be non null"); 200 assert(handler != NULL, "Must be non null"); 201 202 _count = 0; 203 _exception_type = exception->klass(); 204 _next = NULL; 205 206 add_address_and_handler(pc,handler); 207 } 208 209 210 address ExceptionCache::match(Handle exception, address pc) { 211 assert(pc != NULL,"Must be non null"); 212 assert(exception.not_null(),"Must be non null"); 213 if (exception->klass() == exception_type()) { 214 return (test_address(pc)); 215 } 216 217 return NULL; 218 } 219 220 221 bool ExceptionCache::match_exception_with_space(Handle exception) { 222 assert(exception.not_null(),"Must be non null"); 223 if (exception->klass() == exception_type() && count() < cache_size) { 224 return true; 225 } 226 return false; 227 } 228 229 230 address ExceptionCache::test_address(address addr) { 231 for (int i=0; i<count(); i++) { 232 if (pc_at(i) == addr) { 233 return handler_at(i); 234 } 235 } 236 return NULL; 237 } 238 239 240 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 241 if (test_address(addr) == handler) return true; 242 if (count() < cache_size) { 243 set_pc_at(count(),addr); 244 set_handler_at(count(), handler); 245 increment_count(); 246 return true; 247 } 248 return false; 249 } 250 251 252 // private method for handling exception cache 253 // These methods are private, and used to manipulate the exception cache 254 // directly. 255 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 256 ExceptionCache* ec = exception_cache(); 257 while (ec != NULL) { 258 if (ec->match_exception_with_space(exception)) { 259 return ec; 260 } 261 ec = ec->next(); 262 } 263 return NULL; 264 } 265 266 267 //----------------------------------------------------------------------------- 268 269 270 // Helper used by both find_pc_desc methods. 271 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 272 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 273 if (!approximate) 274 return pc->pc_offset() == pc_offset; 275 else 276 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 277 } 278 279 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 280 if (initial_pc_desc == NULL) { 281 _pc_descs[0] = NULL; // native method; no PcDescs at all 282 return; 283 } 284 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 285 // reset the cache by filling it with benign (non-null) values 286 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 287 for (int i = 0; i < cache_size; i++) 288 _pc_descs[i] = initial_pc_desc; 289 } 290 291 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 292 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 293 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 294 295 // Note: one might think that caching the most recently 296 // read value separately would be a win, but one would be 297 // wrong. When many threads are updating it, the cache 298 // line it's in would bounce between caches, negating 299 // any benefit. 300 301 // In order to prevent race conditions do not load cache elements 302 // repeatedly, but use a local copy: 303 PcDesc* res; 304 305 // Step one: Check the most recently added value. 306 res = _pc_descs[0]; 307 if (res == NULL) return NULL; // native method; no PcDescs at all 308 if (match_desc(res, pc_offset, approximate)) { 309 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 310 return res; 311 } 312 313 // Step two: Check the rest of the LRU cache. 314 for (int i = 1; i < cache_size; ++i) { 315 res = _pc_descs[i]; 316 if (res->pc_offset() < 0) break; // optimization: skip empty cache 317 if (match_desc(res, pc_offset, approximate)) { 318 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 319 return res; 320 } 321 } 322 323 // Report failure. 324 return NULL; 325 } 326 327 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 328 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 329 // Update the LRU cache by shifting pc_desc forward. 330 for (int i = 0; i < cache_size; i++) { 331 PcDesc* next = _pc_descs[i]; 332 _pc_descs[i] = pc_desc; 333 pc_desc = next; 334 } 335 } 336 337 // adjust pcs_size so that it is a multiple of both oopSize and 338 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 339 // of oopSize, then 2*sizeof(PcDesc) is) 340 static int adjust_pcs_size(int pcs_size) { 341 int nsize = round_to(pcs_size, oopSize); 342 if ((nsize % sizeof(PcDesc)) != 0) { 343 nsize = pcs_size + sizeof(PcDesc); 344 } 345 assert((nsize % oopSize) == 0, "correct alignment"); 346 return nsize; 347 } 348 349 //----------------------------------------------------------------------------- 350 351 352 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 353 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 354 assert(new_entry != NULL,"Must be non null"); 355 assert(new_entry->next() == NULL, "Must be null"); 356 357 if (exception_cache() != NULL) { 358 new_entry->set_next(exception_cache()); 359 } 360 set_exception_cache(new_entry); 361 } 362 363 void nmethod::remove_from_exception_cache(ExceptionCache* ec) { 364 ExceptionCache* prev = NULL; 365 ExceptionCache* curr = exception_cache(); 366 assert(curr != NULL, "nothing to remove"); 367 // find the previous and next entry of ec 368 while (curr != ec) { 369 prev = curr; 370 curr = curr->next(); 371 assert(curr != NULL, "ExceptionCache not found"); 372 } 373 // now: curr == ec 374 ExceptionCache* next = curr->next(); 375 if (prev == NULL) { 376 set_exception_cache(next); 377 } else { 378 prev->set_next(next); 379 } 380 delete curr; 381 } 382 383 384 // public method for accessing the exception cache 385 // These are the public access methods. 386 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 387 // We never grab a lock to read the exception cache, so we may 388 // have false negatives. This is okay, as it can only happen during 389 // the first few exception lookups for a given nmethod. 390 ExceptionCache* ec = exception_cache(); 391 while (ec != NULL) { 392 address ret_val; 393 if ((ret_val = ec->match(exception,pc)) != NULL) { 394 return ret_val; 395 } 396 ec = ec->next(); 397 } 398 return NULL; 399 } 400 401 402 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 403 // There are potential race conditions during exception cache updates, so we 404 // must own the ExceptionCache_lock before doing ANY modifications. Because 405 // we don't lock during reads, it is possible to have several threads attempt 406 // to update the cache with the same data. We need to check for already inserted 407 // copies of the current data before adding it. 408 409 MutexLocker ml(ExceptionCache_lock); 410 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 411 412 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 413 target_entry = new ExceptionCache(exception,pc,handler); 414 add_exception_cache_entry(target_entry); 415 } 416 } 417 418 419 //-------------end of code for ExceptionCache-------------- 420 421 422 int nmethod::total_size() const { 423 return 424 consts_size() + 425 insts_size() + 426 stub_size() + 427 scopes_data_size() + 428 scopes_pcs_size() + 429 handler_table_size() + 430 nul_chk_table_size(); 431 } 432 433 const char* nmethod::compile_kind() const { 434 if (is_osr_method()) return "osr"; 435 if (method() != NULL && is_native_method()) return "c2n"; 436 return NULL; 437 } 438 439 // Fill in default values for various flag fields 440 void nmethod::init_defaults() { 441 _state = alive; 442 _marked_for_reclamation = 0; 443 _has_flushed_dependencies = 0; 444 _speculatively_disconnected = 0; 445 _has_unsafe_access = 0; 446 _has_method_handle_invokes = 0; 447 _marked_for_deoptimization = 0; 448 _lock_count = 0; 449 _stack_traversal_mark = 0; 450 _unload_reported = false; // jvmti state 451 452 NOT_PRODUCT(_has_debug_info = false); 453 #ifdef ASSERT 454 _oops_are_stale = false; 455 #endif 456 457 _oops_do_mark_link = NULL; 458 _jmethod_id = NULL; 459 _osr_link = NULL; 460 _scavenge_root_link = NULL; 461 _scavenge_root_state = 0; 462 _saved_nmethod_link = NULL; 463 _compiler = NULL; 464 465 #ifdef HAVE_DTRACE_H 466 _trap_offset = 0; 467 #endif // def HAVE_DTRACE_H 468 } 469 470 471 nmethod* nmethod::new_native_nmethod(methodHandle method, 472 CodeBuffer *code_buffer, 473 int vep_offset, 474 int frame_complete, 475 int frame_size, 476 ByteSize basic_lock_owner_sp_offset, 477 ByteSize basic_lock_sp_offset, 478 OopMapSet* oop_maps) { 479 // create nmethod 480 nmethod* nm = NULL; 481 { 482 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 483 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 484 CodeOffsets offsets; 485 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 486 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 487 nm = new (native_nmethod_size) 488 nmethod(method(), native_nmethod_size, &offsets, 489 code_buffer, frame_size, 490 basic_lock_owner_sp_offset, basic_lock_sp_offset, 491 oop_maps); 492 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 493 if (PrintAssembly && nm != NULL) 494 Disassembler::decode(nm); 495 } 496 // verify nmethod 497 debug_only(if (nm) nm->verify();) // might block 498 499 if (nm != NULL) { 500 nm->log_new_nmethod(); 501 } 502 503 return nm; 504 } 505 506 #ifdef HAVE_DTRACE_H 507 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 508 CodeBuffer *code_buffer, 509 int vep_offset, 510 int trap_offset, 511 int frame_complete, 512 int frame_size) { 513 // create nmethod 514 nmethod* nm = NULL; 515 { 516 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 517 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 518 CodeOffsets offsets; 519 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 520 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 521 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 522 523 nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); 524 525 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 526 if (PrintAssembly && nm != NULL) 527 Disassembler::decode(nm); 528 } 529 // verify nmethod 530 debug_only(if (nm) nm->verify();) // might block 531 532 if (nm != NULL) { 533 nm->log_new_nmethod(); 534 } 535 536 return nm; 537 } 538 539 #endif // def HAVE_DTRACE_H 540 541 nmethod* nmethod::new_nmethod(methodHandle method, 542 int compile_id, 543 int entry_bci, 544 CodeOffsets* offsets, 545 int orig_pc_offset, 546 DebugInformationRecorder* debug_info, 547 Dependencies* dependencies, 548 CodeBuffer* code_buffer, int frame_size, 549 OopMapSet* oop_maps, 550 ExceptionHandlerTable* handler_table, 551 ImplicitExceptionTable* nul_chk_table, 552 AbstractCompiler* compiler, 553 int comp_level 554 ) 555 { 556 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 557 // create nmethod 558 nmethod* nm = NULL; 559 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 560 int nmethod_size = 561 allocation_size(code_buffer, sizeof(nmethod)) 562 + adjust_pcs_size(debug_info->pcs_size()) 563 + round_to(dependencies->size_in_bytes() , oopSize) 564 + round_to(handler_table->size_in_bytes(), oopSize) 565 + round_to(nul_chk_table->size_in_bytes(), oopSize) 566 + round_to(debug_info->data_size() , oopSize); 567 nm = new (nmethod_size) 568 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 569 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 570 oop_maps, 571 handler_table, 572 nul_chk_table, 573 compiler, 574 comp_level); 575 if (nm != NULL) { 576 // To make dependency checking during class loading fast, record 577 // the nmethod dependencies in the classes it is dependent on. 578 // This allows the dependency checking code to simply walk the 579 // class hierarchy above the loaded class, checking only nmethods 580 // which are dependent on those classes. The slow way is to 581 // check every nmethod for dependencies which makes it linear in 582 // the number of methods compiled. For applications with a lot 583 // classes the slow way is too slow. 584 for (Dependencies::DepStream deps(nm); deps.next(); ) { 585 klassOop klass = deps.context_type(); 586 if (klass == NULL) continue; // ignore things like evol_method 587 588 // record this nmethod as dependent on this klass 589 instanceKlass::cast(klass)->add_dependent_nmethod(nm); 590 } 591 } 592 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 593 if (PrintAssembly && nm != NULL) 594 Disassembler::decode(nm); 595 } 596 597 // verify nmethod 598 debug_only(if (nm) nm->verify();) // might block 599 600 if (nm != NULL) { 601 nm->log_new_nmethod(); 602 } 603 604 // done 605 return nm; 606 } 607 608 609 // For native wrappers 610 nmethod::nmethod( 611 methodOop method, 612 int nmethod_size, 613 CodeOffsets* offsets, 614 CodeBuffer* code_buffer, 615 int frame_size, 616 ByteSize basic_lock_owner_sp_offset, 617 ByteSize basic_lock_sp_offset, 618 OopMapSet* oop_maps ) 619 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 620 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 621 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 622 _native_basic_lock_sp_offset(basic_lock_sp_offset) 623 { 624 { 625 debug_only(No_Safepoint_Verifier nsv;) 626 assert_locked_or_safepoint(CodeCache_lock); 627 628 init_defaults(); 629 _method = method; 630 _entry_bci = InvocationEntryBci; 631 // We have no exception handler or deopt handler make the 632 // values something that will never match a pc like the nmethod vtable entry 633 _exception_offset = 0; 634 _deoptimize_offset = 0; 635 _deoptimize_mh_offset = 0; 636 _orig_pc_offset = 0; 637 638 _consts_offset = data_offset(); 639 _stub_offset = data_offset(); 640 _oops_offset = data_offset(); 641 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 642 _scopes_pcs_offset = _scopes_data_offset; 643 _dependencies_offset = _scopes_pcs_offset; 644 _handler_table_offset = _dependencies_offset; 645 _nul_chk_table_offset = _handler_table_offset; 646 _nmethod_end_offset = _nul_chk_table_offset; 647 _compile_id = 0; // default 648 _comp_level = CompLevel_none; 649 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 650 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 651 _osr_entry_point = NULL; 652 _exception_cache = NULL; 653 _pc_desc_cache.reset_to(NULL); 654 655 code_buffer->copy_oops_to(this); 656 debug_only(verify_scavenge_root_oops()); 657 CodeCache::commit(this); 658 } 659 660 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 661 ttyLocker ttyl; // keep the following output all in one block 662 // This output goes directly to the tty, not the compiler log. 663 // To enable tools to match it up with the compilation activity, 664 // be sure to tag this tty output with the compile ID. 665 if (xtty != NULL) { 666 xtty->begin_head("print_native_nmethod"); 667 xtty->method(_method); 668 xtty->stamp(); 669 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 670 } 671 // print the header part first 672 print(); 673 // then print the requested information 674 if (PrintNativeNMethods) { 675 print_code(); 676 oop_maps->print(); 677 } 678 if (PrintRelocations) { 679 print_relocations(); 680 } 681 if (xtty != NULL) { 682 xtty->tail("print_native_nmethod"); 683 } 684 } 685 Events::log("Create nmethod " INTPTR_FORMAT, this); 686 } 687 688 // For dtrace wrappers 689 #ifdef HAVE_DTRACE_H 690 nmethod::nmethod( 691 methodOop method, 692 int nmethod_size, 693 CodeOffsets* offsets, 694 CodeBuffer* code_buffer, 695 int frame_size) 696 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 697 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 698 _native_receiver_sp_offset(in_ByteSize(-1)), 699 _native_basic_lock_sp_offset(in_ByteSize(-1)) 700 { 701 { 702 debug_only(No_Safepoint_Verifier nsv;) 703 assert_locked_or_safepoint(CodeCache_lock); 704 705 init_defaults(); 706 _method = method; 707 _entry_bci = InvocationEntryBci; 708 // We have no exception handler or deopt handler make the 709 // values something that will never match a pc like the nmethod vtable entry 710 _exception_offset = 0; 711 _deoptimize_offset = 0; 712 _deoptimize_mh_offset = 0; 713 _unwind_handler_offset = -1; 714 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 715 _orig_pc_offset = 0; 716 _consts_offset = data_offset(); 717 _stub_offset = data_offset(); 718 _oops_offset = data_offset(); 719 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 720 _scopes_pcs_offset = _scopes_data_offset; 721 _dependencies_offset = _scopes_pcs_offset; 722 _handler_table_offset = _dependencies_offset; 723 _nul_chk_table_offset = _handler_table_offset; 724 _nmethod_end_offset = _nul_chk_table_offset; 725 _compile_id = 0; // default 726 _comp_level = CompLevel_none; 727 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 728 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 729 _osr_entry_point = NULL; 730 _exception_cache = NULL; 731 _pc_desc_cache.reset_to(NULL); 732 733 code_buffer->copy_oops_to(this); 734 debug_only(verify_scavenge_root_oops()); 735 CodeCache::commit(this); 736 } 737 738 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 739 ttyLocker ttyl; // keep the following output all in one block 740 // This output goes directly to the tty, not the compiler log. 741 // To enable tools to match it up with the compilation activity, 742 // be sure to tag this tty output with the compile ID. 743 if (xtty != NULL) { 744 xtty->begin_head("print_dtrace_nmethod"); 745 xtty->method(_method); 746 xtty->stamp(); 747 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 748 } 749 // print the header part first 750 print(); 751 // then print the requested information 752 if (PrintNMethods) { 753 print_code(); 754 } 755 if (PrintRelocations) { 756 print_relocations(); 757 } 758 if (xtty != NULL) { 759 xtty->tail("print_dtrace_nmethod"); 760 } 761 } 762 Events::log("Create nmethod " INTPTR_FORMAT, this); 763 } 764 #endif // def HAVE_DTRACE_H 765 766 void* nmethod::operator new(size_t size, int nmethod_size) { 767 // Always leave some room in the CodeCache for I2C/C2I adapters 768 if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) return NULL; 769 return CodeCache::allocate(nmethod_size); 770 } 771 772 773 nmethod::nmethod( 774 methodOop method, 775 int nmethod_size, 776 int compile_id, 777 int entry_bci, 778 CodeOffsets* offsets, 779 int orig_pc_offset, 780 DebugInformationRecorder* debug_info, 781 Dependencies* dependencies, 782 CodeBuffer *code_buffer, 783 int frame_size, 784 OopMapSet* oop_maps, 785 ExceptionHandlerTable* handler_table, 786 ImplicitExceptionTable* nul_chk_table, 787 AbstractCompiler* compiler, 788 int comp_level 789 ) 790 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 791 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 792 _native_receiver_sp_offset(in_ByteSize(-1)), 793 _native_basic_lock_sp_offset(in_ByteSize(-1)) 794 { 795 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 796 { 797 debug_only(No_Safepoint_Verifier nsv;) 798 assert_locked_or_safepoint(CodeCache_lock); 799 800 init_defaults(); 801 _method = method; 802 _entry_bci = entry_bci; 803 _compile_id = compile_id; 804 _comp_level = comp_level; 805 _compiler = compiler; 806 _orig_pc_offset = orig_pc_offset; 807 808 // Section offsets 809 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 810 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 811 812 // Exception handler and deopt handler are in the stub section 813 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 814 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 815 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 816 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 817 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 818 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 819 } else { 820 _deoptimize_mh_offset = -1; 821 } 822 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 823 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 824 } else { 825 _unwind_handler_offset = -1; 826 } 827 828 _oops_offset = data_offset(); 829 _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize); 830 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 831 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 832 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 833 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 834 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 835 836 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 837 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 838 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 839 _exception_cache = NULL; 840 _pc_desc_cache.reset_to(scopes_pcs_begin()); 841 842 // Copy contents of ScopeDescRecorder to nmethod 843 code_buffer->copy_oops_to(this); 844 debug_info->copy_to(this); 845 dependencies->copy_to(this); 846 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 847 CodeCache::add_scavenge_root_nmethod(this); 848 } 849 debug_only(verify_scavenge_root_oops()); 850 851 CodeCache::commit(this); 852 853 // Copy contents of ExceptionHandlerTable to nmethod 854 handler_table->copy_to(this); 855 nul_chk_table->copy_to(this); 856 857 // we use the information of entry points to find out if a method is 858 // static or non static 859 assert(compiler->is_c2() || 860 _method->is_static() == (entry_point() == _verified_entry_point), 861 " entry points must be same for static methods and vice versa"); 862 } 863 864 bool printnmethods = PrintNMethods 865 || CompilerOracle::should_print(_method) 866 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 867 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 868 print_nmethod(printnmethods); 869 } 870 871 // Note: Do not verify in here as the CodeCache_lock is 872 // taken which would conflict with the CompiledIC_lock 873 // which taken during the verification of call sites. 874 // (was bug - gri 10/25/99) 875 876 Events::log("Create nmethod " INTPTR_FORMAT, this); 877 } 878 879 880 // Print a short set of xml attributes to identify this nmethod. The 881 // output should be embedded in some other element. 882 void nmethod::log_identity(xmlStream* log) const { 883 log->print(" compile_id='%d'", compile_id()); 884 const char* nm_kind = compile_kind(); 885 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 886 if (compiler() != NULL) { 887 log->print(" compiler='%s'", compiler()->name()); 888 } 889 if (TieredCompilation) { 890 log->print(" level='%d'", comp_level()); 891 } 892 } 893 894 895 #define LOG_OFFSET(log, name) \ 896 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 897 log->print(" " XSTR(name) "_offset='%d'" , \ 898 (intptr_t)name##_begin() - (intptr_t)this) 899 900 901 void nmethod::log_new_nmethod() const { 902 if (LogCompilation && xtty != NULL) { 903 ttyLocker ttyl; 904 HandleMark hm; 905 xtty->begin_elem("nmethod"); 906 log_identity(xtty); 907 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 908 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 909 910 LOG_OFFSET(xtty, relocation); 911 LOG_OFFSET(xtty, consts); 912 LOG_OFFSET(xtty, insts); 913 LOG_OFFSET(xtty, stub); 914 LOG_OFFSET(xtty, scopes_data); 915 LOG_OFFSET(xtty, scopes_pcs); 916 LOG_OFFSET(xtty, dependencies); 917 LOG_OFFSET(xtty, handler_table); 918 LOG_OFFSET(xtty, nul_chk_table); 919 LOG_OFFSET(xtty, oops); 920 921 xtty->method(method()); 922 xtty->stamp(); 923 xtty->end_elem(); 924 } 925 } 926 927 #undef LOG_OFFSET 928 929 930 void nmethod::print_compilation(outputStream *st, const char *method_name, const char *title, 931 methodOop method, bool is_blocking, int compile_id, int bci, int comp_level) { 932 bool is_synchronized = false, has_xhandler = false, is_native = false; 933 int code_size = -1; 934 if (method != NULL) { 935 is_synchronized = method->is_synchronized(); 936 has_xhandler = method->has_exception_handler(); 937 is_native = method->is_native(); 938 code_size = method->code_size(); 939 } 940 // print compilation number 941 st->print("%7d %3d", (int)tty->time_stamp().milliseconds(), compile_id); 942 943 // print method attributes 944 const bool is_osr = bci != InvocationEntryBci; 945 const char blocking_char = is_blocking ? 'b' : ' '; 946 const char compile_type = is_osr ? '%' : ' '; 947 const char sync_char = is_synchronized ? 's' : ' '; 948 const char exception_char = has_xhandler ? '!' : ' '; 949 const char native_char = is_native ? 'n' : ' '; 950 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 951 if (TieredCompilation) { 952 st->print("%d ", comp_level); 953 } 954 955 // print optional title 956 bool do_nl = false; 957 if (title != NULL) { 958 int tlen = (int) strlen(title); 959 bool do_nl = false; 960 if (tlen > 0 && title[tlen-1] == '\n') { tlen--; do_nl = true; } 961 st->print("%.*s", tlen, title); 962 } else { 963 do_nl = true; 964 } 965 966 // print method name string if given 967 if (method_name != NULL) { 968 st->print(method_name); 969 } else { 970 // otherwise as the method to print itself 971 if (method != NULL && !Universe::heap()->is_gc_active()) { 972 method->print_short_name(st); 973 } else { 974 st->print("(method)"); 975 } 976 } 977 978 if (method != NULL) { 979 // print osr_bci if any 980 if (is_osr) st->print(" @ %d", bci); 981 // print method size 982 st->print(" (%d bytes)", code_size); 983 } 984 if (do_nl) st->cr(); 985 } 986 987 // Print out more verbose output usually for a newly created nmethod. 988 void nmethod::print_on(outputStream* st, const char* title) const { 989 if (st != NULL) { 990 ttyLocker ttyl; 991 print_compilation(st, /*method_name*/NULL, title, 992 method(), /*is_blocking*/false, 993 compile_id(), 994 is_osr_method() ? osr_entry_bci() : InvocationEntryBci, 995 comp_level()); 996 if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this); 997 } 998 } 999 1000 1001 void nmethod::print_nmethod(bool printmethod) { 1002 ttyLocker ttyl; // keep the following output all in one block 1003 if (xtty != NULL) { 1004 xtty->begin_head("print_nmethod"); 1005 xtty->stamp(); 1006 xtty->end_head(); 1007 } 1008 // print the header part first 1009 print(); 1010 // then print the requested information 1011 if (printmethod) { 1012 print_code(); 1013 print_pcs(); 1014 oop_maps()->print(); 1015 } 1016 if (PrintDebugInfo) { 1017 print_scopes(); 1018 } 1019 if (PrintRelocations) { 1020 print_relocations(); 1021 } 1022 if (PrintDependencies) { 1023 print_dependencies(); 1024 } 1025 if (PrintExceptionHandlers) { 1026 print_handler_table(); 1027 print_nul_chk_table(); 1028 } 1029 if (xtty != NULL) { 1030 xtty->tail("print_nmethod"); 1031 } 1032 } 1033 1034 1035 // Promote one word from an assembly-time handle to a live embedded oop. 1036 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1037 if (handle == NULL || 1038 // As a special case, IC oops are initialized to 1 or -1. 1039 handle == (jobject) Universe::non_oop_word()) { 1040 (*dest) = (oop) handle; 1041 } else { 1042 (*dest) = JNIHandles::resolve_non_null(handle); 1043 } 1044 } 1045 1046 1047 void nmethod::copy_oops(GrowableArray<jobject>* array) { 1048 //assert(oops_size() == 0, "do this handshake just once, please"); 1049 int length = array->length(); 1050 assert((address)(oops_begin() + length) <= data_end(), "oops big enough"); 1051 oop* dest = oops_begin(); 1052 for (int index = 0 ; index < length; index++) { 1053 initialize_immediate_oop(&dest[index], array->at(index)); 1054 } 1055 1056 // Now we can fix up all the oops in the code. We need to do this 1057 // in the code because the assembler uses jobjects as placeholders. 1058 // The code and relocations have already been initialized by the 1059 // CodeBlob constructor, so it is valid even at this early point to 1060 // iterate over relocations and patch the code. 1061 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1062 } 1063 1064 1065 bool nmethod::is_at_poll_return(address pc) { 1066 RelocIterator iter(this, pc, pc+1); 1067 while (iter.next()) { 1068 if (iter.type() == relocInfo::poll_return_type) 1069 return true; 1070 } 1071 return false; 1072 } 1073 1074 1075 bool nmethod::is_at_poll_or_poll_return(address pc) { 1076 RelocIterator iter(this, pc, pc+1); 1077 while (iter.next()) { 1078 relocInfo::relocType t = iter.type(); 1079 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1080 return true; 1081 } 1082 return false; 1083 } 1084 1085 1086 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1087 // re-patch all oop-bearing instructions, just in case some oops moved 1088 RelocIterator iter(this, begin, end); 1089 while (iter.next()) { 1090 if (iter.type() == relocInfo::oop_type) { 1091 oop_Relocation* reloc = iter.oop_reloc(); 1092 if (initialize_immediates && reloc->oop_is_immediate()) { 1093 oop* dest = reloc->oop_addr(); 1094 initialize_immediate_oop(dest, (jobject) *dest); 1095 } 1096 // Refresh the oop-related bits of this instruction. 1097 reloc->fix_oop_relocation(); 1098 } 1099 1100 // There must not be any interfering patches or breakpoints. 1101 assert(!(iter.type() == relocInfo::breakpoint_type 1102 && iter.breakpoint_reloc()->active()), 1103 "no active breakpoint"); 1104 } 1105 } 1106 1107 1108 ScopeDesc* nmethod::scope_desc_at(address pc) { 1109 PcDesc* pd = pc_desc_at(pc); 1110 guarantee(pd != NULL, "scope must be present"); 1111 return new ScopeDesc(this, pd->scope_decode_offset(), 1112 pd->obj_decode_offset(), pd->should_reexecute(), 1113 pd->return_oop()); 1114 } 1115 1116 1117 void nmethod::clear_inline_caches() { 1118 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1119 if (is_zombie()) { 1120 return; 1121 } 1122 1123 RelocIterator iter(this); 1124 while (iter.next()) { 1125 iter.reloc()->clear_inline_cache(); 1126 } 1127 } 1128 1129 1130 void nmethod::cleanup_inline_caches() { 1131 1132 assert_locked_or_safepoint(CompiledIC_lock); 1133 1134 // If the method is not entrant or zombie then a JMP is plastered over the 1135 // first few bytes. If an oop in the old code was there, that oop 1136 // should not get GC'd. Skip the first few bytes of oops on 1137 // not-entrant methods. 1138 address low_boundary = verified_entry_point(); 1139 if (!is_in_use()) { 1140 low_boundary += NativeJump::instruction_size; 1141 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1142 // This means that the low_boundary is going to be a little too high. 1143 // This shouldn't matter, since oops of non-entrant methods are never used. 1144 // In fact, why are we bothering to look at oops in a non-entrant method?? 1145 } 1146 1147 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1148 ResourceMark rm; 1149 RelocIterator iter(this, low_boundary); 1150 while(iter.next()) { 1151 switch(iter.type()) { 1152 case relocInfo::virtual_call_type: 1153 case relocInfo::opt_virtual_call_type: { 1154 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1155 // Ok, to lookup references to zombies here 1156 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1157 if( cb != NULL && cb->is_nmethod() ) { 1158 nmethod* nm = (nmethod*)cb; 1159 // Clean inline caches pointing to both zombie and not_entrant methods 1160 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1161 } 1162 break; 1163 } 1164 case relocInfo::static_call_type: { 1165 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1166 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1167 if( cb != NULL && cb->is_nmethod() ) { 1168 nmethod* nm = (nmethod*)cb; 1169 // Clean inline caches pointing to both zombie and not_entrant methods 1170 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1171 } 1172 break; 1173 } 1174 } 1175 } 1176 } 1177 1178 // This is a private interface with the sweeper. 1179 void nmethod::mark_as_seen_on_stack() { 1180 assert(is_not_entrant(), "must be a non-entrant method"); 1181 // Set the traversal mark to ensure that the sweeper does 2 1182 // cleaning passes before moving to zombie. 1183 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1184 } 1185 1186 // Tell if a non-entrant method can be converted to a zombie (i.e., 1187 // there are no activations on the stack, not in use by the VM, 1188 // and not in use by the ServiceThread) 1189 bool nmethod::can_not_entrant_be_converted() { 1190 assert(is_not_entrant(), "must be a non-entrant method"); 1191 1192 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1193 // count can be greater than the stack traversal count before it hits the 1194 // nmethod for the second time. 1195 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1196 !is_locked_by_vm(); 1197 } 1198 1199 void nmethod::inc_decompile_count() { 1200 if (!is_compiled_by_c2()) return; 1201 // Could be gated by ProfileTraps, but do not bother... 1202 methodOop m = method(); 1203 if (m == NULL) return; 1204 methodDataOop mdo = m->method_data(); 1205 if (mdo == NULL) return; 1206 // There is a benign race here. See comments in methodDataOop.hpp. 1207 mdo->inc_decompile_count(); 1208 } 1209 1210 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1211 1212 post_compiled_method_unload(); 1213 1214 // Since this nmethod is being unloaded, make sure that dependencies 1215 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1216 // indicate that this work is being done during a GC. 1217 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1218 assert(is_alive != NULL, "Should be non-NULL"); 1219 // A non-NULL is_alive closure indicates that this is being called during GC. 1220 flush_dependencies(is_alive); 1221 1222 // Break cycle between nmethod & method 1223 if (TraceClassUnloading && WizardMode) { 1224 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1225 " unloadable], methodOop(" INTPTR_FORMAT 1226 "), cause(" INTPTR_FORMAT ")", 1227 this, (address)_method, (address)cause); 1228 if (!Universe::heap()->is_gc_active()) 1229 cause->klass()->print(); 1230 } 1231 // Unlink the osr method, so we do not look this up again 1232 if (is_osr_method()) { 1233 invalidate_osr_method(); 1234 } 1235 // If _method is already NULL the methodOop is about to be unloaded, 1236 // so we don't have to break the cycle. Note that it is possible to 1237 // have the methodOop live here, in case we unload the nmethod because 1238 // it is pointing to some oop (other than the methodOop) being unloaded. 1239 if (_method != NULL) { 1240 // OSR methods point to the methodOop, but the methodOop does not 1241 // point back! 1242 if (_method->code() == this) { 1243 _method->clear_code(); // Break a cycle 1244 } 1245 _method = NULL; // Clear the method of this dead nmethod 1246 } 1247 // Make the class unloaded - i.e., change state and notify sweeper 1248 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1249 if (is_in_use()) { 1250 // Transitioning directly from live to unloaded -- so 1251 // we need to force a cache clean-up; remember this 1252 // for later on. 1253 CodeCache::set_needs_cache_clean(true); 1254 } 1255 _state = unloaded; 1256 1257 // Log the unloading. 1258 log_state_change(); 1259 1260 // The methodOop is gone at this point 1261 assert(_method == NULL, "Tautology"); 1262 1263 set_osr_link(NULL); 1264 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1265 NMethodSweeper::notify(this); 1266 } 1267 1268 void nmethod::invalidate_osr_method() { 1269 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1270 // Remove from list of active nmethods 1271 if (method() != NULL) 1272 instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); 1273 // Set entry as invalid 1274 _entry_bci = InvalidOSREntryBci; 1275 } 1276 1277 void nmethod::log_state_change() const { 1278 if (LogCompilation) { 1279 if (xtty != NULL) { 1280 ttyLocker ttyl; // keep the following output all in one block 1281 if (_state == unloaded) { 1282 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1283 os::current_thread_id()); 1284 } else { 1285 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1286 os::current_thread_id(), 1287 (_state == zombie ? " zombie='1'" : "")); 1288 } 1289 log_identity(xtty); 1290 xtty->stamp(); 1291 xtty->end_elem(); 1292 } 1293 } 1294 if (PrintCompilation && _state != unloaded) { 1295 print_on(tty, _state == zombie ? "made zombie " : "made not entrant "); 1296 tty->cr(); 1297 } 1298 } 1299 1300 // Common functionality for both make_not_entrant and make_zombie 1301 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1302 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1303 assert(!is_zombie(), "should not already be a zombie"); 1304 1305 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1306 nmethodLocker nml(this); 1307 methodHandle the_method(method()); 1308 No_Safepoint_Verifier nsv; 1309 1310 { 1311 // invalidate osr nmethod before acquiring the patching lock since 1312 // they both acquire leaf locks and we don't want a deadlock. 1313 // This logic is equivalent to the logic below for patching the 1314 // verified entry point of regular methods. 1315 if (is_osr_method()) { 1316 // this effectively makes the osr nmethod not entrant 1317 invalidate_osr_method(); 1318 } 1319 1320 // Enter critical section. Does not block for safepoint. 1321 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1322 1323 if (_state == state) { 1324 // another thread already performed this transition so nothing 1325 // to do, but return false to indicate this. 1326 return false; 1327 } 1328 1329 // The caller can be calling the method statically or through an inline 1330 // cache call. 1331 if (!is_osr_method() && !is_not_entrant()) { 1332 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1333 SharedRuntime::get_handle_wrong_method_stub()); 1334 } 1335 1336 if (is_in_use()) { 1337 // It's a true state change, so mark the method as decompiled. 1338 // Do it only for transition from alive. 1339 inc_decompile_count(); 1340 } 1341 1342 // Change state 1343 _state = state; 1344 1345 // Log the transition once 1346 log_state_change(); 1347 1348 // Remove nmethod from method. 1349 // We need to check if both the _code and _from_compiled_code_entry_point 1350 // refer to this nmethod because there is a race in setting these two fields 1351 // in methodOop as seen in bugid 4947125. 1352 // If the vep() points to the zombie nmethod, the memory for the nmethod 1353 // could be flushed and the compiler and vtable stubs could still call 1354 // through it. 1355 if (method() != NULL && (method()->code() == this || 1356 method()->from_compiled_entry() == verified_entry_point())) { 1357 HandleMark hm; 1358 method()->clear_code(); 1359 } 1360 1361 if (state == not_entrant) { 1362 mark_as_seen_on_stack(); 1363 } 1364 1365 } // leave critical region under Patching_lock 1366 1367 // When the nmethod becomes zombie it is no longer alive so the 1368 // dependencies must be flushed. nmethods in the not_entrant 1369 // state will be flushed later when the transition to zombie 1370 // happens or they get unloaded. 1371 if (state == zombie) { 1372 { 1373 // Flushing dependecies must be done before any possible 1374 // safepoint can sneak in, otherwise the oops used by the 1375 // dependency logic could have become stale. 1376 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1377 flush_dependencies(NULL); 1378 } 1379 1380 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1381 // event and it hasn't already been reported for this nmethod then 1382 // report it now. The event may have been reported earilier if the GC 1383 // marked it for unloading). JvmtiDeferredEventQueue support means 1384 // we no longer go to a safepoint here. 1385 post_compiled_method_unload(); 1386 1387 #ifdef ASSERT 1388 // It's no longer safe to access the oops section since zombie 1389 // nmethods aren't scanned for GC. 1390 _oops_are_stale = true; 1391 #endif 1392 } else { 1393 assert(state == not_entrant, "other cases may need to be handled differently"); 1394 } 1395 1396 if (TraceCreateZombies) { 1397 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1398 } 1399 1400 // Make sweeper aware that there is a zombie method that needs to be removed 1401 NMethodSweeper::notify(this); 1402 1403 return true; 1404 } 1405 1406 void nmethod::flush() { 1407 // Note that there are no valid oops in the nmethod anymore. 1408 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1409 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1410 1411 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1412 assert_locked_or_safepoint(CodeCache_lock); 1413 1414 // completely deallocate this method 1415 EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, ""); 1416 if (PrintMethodFlushing) { 1417 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1418 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1419 } 1420 1421 // We need to deallocate any ExceptionCache data. 1422 // Note that we do not need to grab the nmethod lock for this, it 1423 // better be thread safe if we're disposing of it! 1424 ExceptionCache* ec = exception_cache(); 1425 set_exception_cache(NULL); 1426 while(ec != NULL) { 1427 ExceptionCache* next = ec->next(); 1428 delete ec; 1429 ec = next; 1430 } 1431 1432 if (on_scavenge_root_list()) { 1433 CodeCache::drop_scavenge_root_nmethod(this); 1434 } 1435 1436 if (is_speculatively_disconnected()) { 1437 CodeCache::remove_saved_code(this); 1438 } 1439 1440 #ifdef SHARK 1441 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1442 #endif // SHARK 1443 1444 ((CodeBlob*)(this))->flush(); 1445 1446 CodeCache::free(this); 1447 } 1448 1449 1450 // 1451 // Notify all classes this nmethod is dependent on that it is no 1452 // longer dependent. This should only be called in two situations. 1453 // First, when a nmethod transitions to a zombie all dependents need 1454 // to be clear. Since zombification happens at a safepoint there's no 1455 // synchronization issues. The second place is a little more tricky. 1456 // During phase 1 of mark sweep class unloading may happen and as a 1457 // result some nmethods may get unloaded. In this case the flushing 1458 // of dependencies must happen during phase 1 since after GC any 1459 // dependencies in the unloaded nmethod won't be updated, so 1460 // traversing the dependency information in unsafe. In that case this 1461 // function is called with a non-NULL argument and this function only 1462 // notifies instanceKlasses that are reachable 1463 1464 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1465 assert_locked_or_safepoint(CodeCache_lock); 1466 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1467 "is_alive is non-NULL if and only if we are called during GC"); 1468 if (!has_flushed_dependencies()) { 1469 set_has_flushed_dependencies(); 1470 for (Dependencies::DepStream deps(this); deps.next(); ) { 1471 klassOop klass = deps.context_type(); 1472 if (klass == NULL) continue; // ignore things like evol_method 1473 1474 // During GC the is_alive closure is non-NULL, and is used to 1475 // determine liveness of dependees that need to be updated. 1476 if (is_alive == NULL || is_alive->do_object_b(klass)) { 1477 instanceKlass::cast(klass)->remove_dependent_nmethod(this); 1478 } 1479 } 1480 } 1481 } 1482 1483 1484 // If this oop is not live, the nmethod can be unloaded. 1485 bool nmethod::can_unload(BoolObjectClosure* is_alive, 1486 OopClosure* keep_alive, 1487 oop* root, bool unloading_occurred) { 1488 assert(root != NULL, "just checking"); 1489 oop obj = *root; 1490 if (obj == NULL || is_alive->do_object_b(obj)) { 1491 return false; 1492 } 1493 if (obj->is_compiledICHolder()) { 1494 compiledICHolderOop cichk_oop = compiledICHolderOop(obj); 1495 if (is_alive->do_object_b( 1496 cichk_oop->holder_method()->method_holder()) && 1497 is_alive->do_object_b(cichk_oop->holder_klass())) { 1498 // The oop should be kept alive 1499 keep_alive->do_oop(root); 1500 return false; 1501 } 1502 } 1503 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1504 // simply because one of its constant oops has gone dead. 1505 // No actual classes need to be unloaded in order for this to occur. 1506 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1507 make_unloaded(is_alive, obj); 1508 return true; 1509 } 1510 1511 // ------------------------------------------------------------------ 1512 // post_compiled_method_load_event 1513 // new method for install_code() path 1514 // Transfer information from compilation to jvmti 1515 void nmethod::post_compiled_method_load_event() { 1516 1517 methodOop moop = method(); 1518 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1519 moop->klass_name()->bytes(), 1520 moop->klass_name()->utf8_length(), 1521 moop->name()->bytes(), 1522 moop->name()->utf8_length(), 1523 moop->signature()->bytes(), 1524 moop->signature()->utf8_length(), 1525 insts_begin(), insts_size()); 1526 1527 if (JvmtiExport::should_post_compiled_method_load() || 1528 JvmtiExport::should_post_compiled_method_unload()) { 1529 get_and_cache_jmethod_id(); 1530 } 1531 1532 if (JvmtiExport::should_post_compiled_method_load()) { 1533 // Let the Service thread (which is a real Java thread) post the event 1534 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1535 JvmtiDeferredEventQueue::enqueue( 1536 JvmtiDeferredEvent::compiled_method_load_event(this)); 1537 } 1538 } 1539 1540 jmethodID nmethod::get_and_cache_jmethod_id() { 1541 if (_jmethod_id == NULL) { 1542 // Cache the jmethod_id since it can no longer be looked up once the 1543 // method itself has been marked for unloading. 1544 _jmethod_id = method()->jmethod_id(); 1545 } 1546 return _jmethod_id; 1547 } 1548 1549 void nmethod::post_compiled_method_unload() { 1550 if (unload_reported()) { 1551 // During unloading we transition to unloaded and then to zombie 1552 // and the unloading is reported during the first transition. 1553 return; 1554 } 1555 1556 assert(_method != NULL && !is_unloaded(), "just checking"); 1557 DTRACE_METHOD_UNLOAD_PROBE(method()); 1558 1559 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1560 // post the event. Sometime later this nmethod will be made a zombie 1561 // by the sweeper but the methodOop will not be valid at that point. 1562 // If the _jmethod_id is null then no load event was ever requested 1563 // so don't bother posting the unload. The main reason for this is 1564 // that the jmethodID is a weak reference to the methodOop so if 1565 // it's being unloaded there's no way to look it up since the weak 1566 // ref will have been cleared. 1567 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1568 assert(!unload_reported(), "already unloaded"); 1569 JvmtiDeferredEvent event = 1570 JvmtiDeferredEvent::compiled_method_unload_event(this, 1571 _jmethod_id, insts_begin()); 1572 if (SafepointSynchronize::is_at_safepoint()) { 1573 // Don't want to take the queueing lock. Add it as pending and 1574 // it will get enqueued later. 1575 JvmtiDeferredEventQueue::add_pending_event(event); 1576 } else { 1577 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1578 JvmtiDeferredEventQueue::enqueue(event); 1579 } 1580 } 1581 1582 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1583 // any time. As the nmethod is being unloaded now we mark it has 1584 // having the unload event reported - this will ensure that we don't 1585 // attempt to report the event in the unlikely scenario where the 1586 // event is enabled at the time the nmethod is made a zombie. 1587 set_unload_reported(); 1588 } 1589 1590 // This is called at the end of the strong tracing/marking phase of a 1591 // GC to unload an nmethod if it contains otherwise unreachable 1592 // oops. 1593 1594 void nmethod::do_unloading(BoolObjectClosure* is_alive, 1595 OopClosure* keep_alive, bool unloading_occurred) { 1596 // Make sure the oop's ready to receive visitors 1597 assert(!is_zombie() && !is_unloaded(), 1598 "should not call follow on zombie or unloaded nmethod"); 1599 1600 // If the method is not entrant then a JMP is plastered over the 1601 // first few bytes. If an oop in the old code was there, that oop 1602 // should not get GC'd. Skip the first few bytes of oops on 1603 // not-entrant methods. 1604 address low_boundary = verified_entry_point(); 1605 if (is_not_entrant()) { 1606 low_boundary += NativeJump::instruction_size; 1607 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1608 // (See comment above.) 1609 } 1610 1611 // The RedefineClasses() API can cause the class unloading invariant 1612 // to no longer be true. See jvmtiExport.hpp for details. 1613 // Also, leave a debugging breadcrumb in local flag. 1614 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1615 if (a_class_was_redefined) { 1616 // This set of the unloading_occurred flag is done before the 1617 // call to post_compiled_method_unload() so that the unloading 1618 // of this nmethod is reported. 1619 unloading_occurred = true; 1620 } 1621 1622 // Follow methodOop 1623 if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { 1624 return; 1625 } 1626 1627 // Exception cache 1628 ExceptionCache* ec = exception_cache(); 1629 while (ec != NULL) { 1630 oop* ex_addr = (oop*)ec->exception_type_addr(); 1631 oop ex = *ex_addr; 1632 ExceptionCache* next_ec = ec->next(); 1633 if (ex != NULL && !is_alive->do_object_b(ex)) { 1634 assert(!ex->is_compiledICHolder(), "Possible error here"); 1635 remove_from_exception_cache(ec); 1636 } 1637 ec = next_ec; 1638 } 1639 1640 // If class unloading occurred we first iterate over all inline caches and 1641 // clear ICs where the cached oop is referring to an unloaded klass or method. 1642 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1643 // iteration below. 1644 if (unloading_occurred) { 1645 RelocIterator iter(this, low_boundary); 1646 while(iter.next()) { 1647 if (iter.type() == relocInfo::virtual_call_type) { 1648 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1649 oop ic_oop = ic->cached_oop(); 1650 if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { 1651 // The only exception is compiledICHolder oops which may 1652 // yet be marked below. (We check this further below). 1653 if (ic_oop->is_compiledICHolder()) { 1654 compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); 1655 if (is_alive->do_object_b( 1656 cichk_oop->holder_method()->method_holder()) && 1657 is_alive->do_object_b(cichk_oop->holder_klass())) { 1658 continue; 1659 } 1660 } 1661 ic->set_to_clean(); 1662 assert(ic->cached_oop() == NULL, 1663 "cached oop in IC should be cleared"); 1664 } 1665 } 1666 } 1667 } 1668 1669 // Compiled code 1670 RelocIterator iter(this, low_boundary); 1671 while (iter.next()) { 1672 if (iter.type() == relocInfo::oop_type) { 1673 oop_Relocation* r = iter.oop_reloc(); 1674 // In this loop, we must only traverse those oops directly embedded in 1675 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1676 assert(1 == (r->oop_is_immediate()) + 1677 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1678 "oop must be found in exactly one place"); 1679 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1680 if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { 1681 return; 1682 } 1683 } 1684 } 1685 } 1686 1687 1688 // Scopes 1689 for (oop* p = oops_begin(); p < oops_end(); p++) { 1690 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1691 if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { 1692 return; 1693 } 1694 } 1695 1696 #ifndef PRODUCT 1697 // This nmethod was not unloaded; check below that all CompiledICs 1698 // refer to marked oops. 1699 { 1700 RelocIterator iter(this, low_boundary); 1701 while (iter.next()) { 1702 if (iter.type() == relocInfo::virtual_call_type) { 1703 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1704 oop ic_oop = ic->cached_oop(); 1705 assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), 1706 "Found unmarked ic_oop in reachable nmethod"); 1707 } 1708 } 1709 } 1710 #endif // !PRODUCT 1711 } 1712 1713 // This method is called twice during GC -- once while 1714 // tracing the "active" nmethods on thread stacks during 1715 // the (strong) marking phase, and then again when walking 1716 // the code cache contents during the weak roots processing 1717 // phase. The two uses are distinguished by means of the 1718 // 'do_strong_roots_only' flag, which is true in the first 1719 // case. We want to walk the weak roots in the nmethod 1720 // only in the second case. The weak roots in the nmethod 1721 // are the oops in the ExceptionCache and the InlineCache 1722 // oops. 1723 void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { 1724 // make sure the oops ready to receive visitors 1725 assert(!is_zombie() && !is_unloaded(), 1726 "should not call follow on zombie or unloaded nmethod"); 1727 1728 // If the method is not entrant or zombie then a JMP is plastered over the 1729 // first few bytes. If an oop in the old code was there, that oop 1730 // should not get GC'd. Skip the first few bytes of oops on 1731 // not-entrant methods. 1732 address low_boundary = verified_entry_point(); 1733 if (is_not_entrant()) { 1734 low_boundary += NativeJump::instruction_size; 1735 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1736 // (See comment above.) 1737 } 1738 1739 // Compiled code 1740 f->do_oop((oop*) &_method); 1741 if (!do_strong_roots_only) { 1742 // weak roots processing phase -- update ExceptionCache oops 1743 ExceptionCache* ec = exception_cache(); 1744 while(ec != NULL) { 1745 f->do_oop((oop*)ec->exception_type_addr()); 1746 ec = ec->next(); 1747 } 1748 } // Else strong roots phase -- skip oops in ExceptionCache 1749 1750 RelocIterator iter(this, low_boundary); 1751 1752 while (iter.next()) { 1753 if (iter.type() == relocInfo::oop_type ) { 1754 oop_Relocation* r = iter.oop_reloc(); 1755 // In this loop, we must only follow those oops directly embedded in 1756 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1757 assert(1 == (r->oop_is_immediate()) + 1758 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1759 "oop must be found in exactly one place"); 1760 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1761 f->do_oop(r->oop_addr()); 1762 } 1763 } 1764 } 1765 1766 // Scopes 1767 // This includes oop constants not inlined in the code stream. 1768 for (oop* p = oops_begin(); p < oops_end(); p++) { 1769 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1770 f->do_oop(p); 1771 } 1772 } 1773 1774 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1775 1776 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1777 1778 // An nmethod is "marked" if its _mark_link is set non-null. 1779 // Even if it is the end of the linked list, it will have a non-null link value, 1780 // as long as it is on the list. 1781 // This code must be MP safe, because it is used from parallel GC passes. 1782 bool nmethod::test_set_oops_do_mark() { 1783 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1784 nmethod* observed_mark_link = _oops_do_mark_link; 1785 if (observed_mark_link == NULL) { 1786 // Claim this nmethod for this thread to mark. 1787 observed_mark_link = (nmethod*) 1788 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1789 if (observed_mark_link == NULL) { 1790 1791 // Atomically append this nmethod (now claimed) to the head of the list: 1792 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1793 for (;;) { 1794 nmethod* required_mark_nmethods = observed_mark_nmethods; 1795 _oops_do_mark_link = required_mark_nmethods; 1796 observed_mark_nmethods = (nmethod*) 1797 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1798 if (observed_mark_nmethods == required_mark_nmethods) 1799 break; 1800 } 1801 // Mark was clear when we first saw this guy. 1802 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark\n")); 1803 return false; 1804 } 1805 } 1806 // On fall through, another racing thread marked this nmethod before we did. 1807 return true; 1808 } 1809 1810 void nmethod::oops_do_marking_prologue() { 1811 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 1812 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1813 // We use cmpxchg_ptr instead of regular assignment here because the user 1814 // may fork a bunch of threads, and we need them all to see the same state. 1815 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1816 guarantee(observed == NULL, "no races in this sequential code"); 1817 } 1818 1819 void nmethod::oops_do_marking_epilogue() { 1820 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1821 nmethod* cur = _oops_do_mark_nmethods; 1822 while (cur != NMETHOD_SENTINEL) { 1823 assert(cur != NULL, "not NULL-terminated"); 1824 nmethod* next = cur->_oops_do_mark_link; 1825 cur->_oops_do_mark_link = NULL; 1826 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark\n")); 1827 cur = next; 1828 } 1829 void* required = _oops_do_mark_nmethods; 1830 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1831 guarantee(observed == required, "no races in this sequential code"); 1832 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 1833 } 1834 1835 class DetectScavengeRoot: public OopClosure { 1836 bool _detected_scavenge_root; 1837 public: 1838 DetectScavengeRoot() : _detected_scavenge_root(false) 1839 { NOT_PRODUCT(_print_nm = NULL); } 1840 bool detected_scavenge_root() { return _detected_scavenge_root; } 1841 virtual void do_oop(oop* p) { 1842 if ((*p) != NULL && (*p)->is_scavengable()) { 1843 NOT_PRODUCT(maybe_print(p)); 1844 _detected_scavenge_root = true; 1845 } 1846 } 1847 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1848 1849 #ifndef PRODUCT 1850 nmethod* _print_nm; 1851 void maybe_print(oop* p) { 1852 if (_print_nm == NULL) return; 1853 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1854 tty->print_cr(""PTR_FORMAT"[offset=%d] detected non-perm oop "PTR_FORMAT" (found at "PTR_FORMAT")", 1855 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 1856 (intptr_t)(*p), (intptr_t)p); 1857 (*p)->print(); 1858 } 1859 #endif //PRODUCT 1860 }; 1861 1862 bool nmethod::detect_scavenge_root_oops() { 1863 DetectScavengeRoot detect_scavenge_root; 1864 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1865 oops_do(&detect_scavenge_root); 1866 return detect_scavenge_root.detected_scavenge_root(); 1867 } 1868 1869 // Method that knows how to preserve outgoing arguments at call. This method must be 1870 // called with a frame corresponding to a Java invoke 1871 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 1872 #ifndef SHARK 1873 if (!method()->is_native()) { 1874 SimpleScopeDesc ssd(this, fr.pc()); 1875 Bytecode_invoke call(ssd.method(), ssd.bci()); 1876 bool has_receiver = call.has_receiver(); 1877 Symbol* signature = call.signature(); 1878 fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f); 1879 } 1880 #endif // !SHARK 1881 } 1882 1883 1884 oop nmethod::embeddedOop_at(u_char* p) { 1885 RelocIterator iter(this, p, p + 1); 1886 while (iter.next()) 1887 if (iter.type() == relocInfo::oop_type) { 1888 return iter.oop_reloc()->oop_value(); 1889 } 1890 return NULL; 1891 } 1892 1893 1894 inline bool includes(void* p, void* from, void* to) { 1895 return from <= p && p < to; 1896 } 1897 1898 1899 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1900 assert(count >= 2, "must be sentinel values, at least"); 1901 1902 #ifdef ASSERT 1903 // must be sorted and unique; we do a binary search in find_pc_desc() 1904 int prev_offset = pcs[0].pc_offset(); 1905 assert(prev_offset == PcDesc::lower_offset_limit, 1906 "must start with a sentinel"); 1907 for (int i = 1; i < count; i++) { 1908 int this_offset = pcs[i].pc_offset(); 1909 assert(this_offset > prev_offset, "offsets must be sorted"); 1910 prev_offset = this_offset; 1911 } 1912 assert(prev_offset == PcDesc::upper_offset_limit, 1913 "must end with a sentinel"); 1914 #endif //ASSERT 1915 1916 // Search for MethodHandle invokes and tag the nmethod. 1917 for (int i = 0; i < count; i++) { 1918 if (pcs[i].is_method_handle_invoke()) { 1919 set_has_method_handle_invokes(true); 1920 break; 1921 } 1922 } 1923 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 1924 1925 int size = count * sizeof(PcDesc); 1926 assert(scopes_pcs_size() >= size, "oob"); 1927 memcpy(scopes_pcs_begin(), pcs, size); 1928 1929 // Adjust the final sentinel downward. 1930 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1931 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1932 last_pc->set_pc_offset(content_size() + 1); 1933 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1934 // Fill any rounding gaps with copies of the last record. 1935 last_pc[1] = last_pc[0]; 1936 } 1937 // The following assert could fail if sizeof(PcDesc) is not 1938 // an integral multiple of oopSize (the rounding term). 1939 // If it fails, change the logic to always allocate a multiple 1940 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1941 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1942 } 1943 1944 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1945 assert(scopes_data_size() >= size, "oob"); 1946 memcpy(scopes_data_begin(), buffer, size); 1947 } 1948 1949 1950 #ifdef ASSERT 1951 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 1952 PcDesc* lower = nm->scopes_pcs_begin(); 1953 PcDesc* upper = nm->scopes_pcs_end(); 1954 lower += 1; // exclude initial sentinel 1955 PcDesc* res = NULL; 1956 for (PcDesc* p = lower; p < upper; p++) { 1957 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1958 if (match_desc(p, pc_offset, approximate)) { 1959 if (res == NULL) 1960 res = p; 1961 else 1962 res = (PcDesc*) badAddress; 1963 } 1964 } 1965 return res; 1966 } 1967 #endif 1968 1969 1970 // Finds a PcDesc with real-pc equal to "pc" 1971 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 1972 address base_address = code_begin(); 1973 if ((pc < base_address) || 1974 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1975 return NULL; // PC is wildly out of range 1976 } 1977 int pc_offset = (int) (pc - base_address); 1978 1979 // Check the PcDesc cache if it contains the desired PcDesc 1980 // (This as an almost 100% hit rate.) 1981 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1982 if (res != NULL) { 1983 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 1984 return res; 1985 } 1986 1987 // Fallback algorithm: quasi-linear search for the PcDesc 1988 // Find the last pc_offset less than the given offset. 1989 // The successor must be the required match, if there is a match at all. 1990 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1991 PcDesc* lower = scopes_pcs_begin(); 1992 PcDesc* upper = scopes_pcs_end(); 1993 upper -= 1; // exclude final sentinel 1994 if (lower >= upper) return NULL; // native method; no PcDescs at all 1995 1996 #define assert_LU_OK \ 1997 /* invariant on lower..upper during the following search: */ \ 1998 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1999 assert(upper->pc_offset() >= pc_offset, "sanity") 2000 assert_LU_OK; 2001 2002 // Use the last successful return as a split point. 2003 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2004 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2005 if (mid->pc_offset() < pc_offset) { 2006 lower = mid; 2007 } else { 2008 upper = mid; 2009 } 2010 2011 // Take giant steps at first (4096, then 256, then 16, then 1) 2012 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2013 const int RADIX = (1 << LOG2_RADIX); 2014 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2015 while ((mid = lower + step) < upper) { 2016 assert_LU_OK; 2017 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2018 if (mid->pc_offset() < pc_offset) { 2019 lower = mid; 2020 } else { 2021 upper = mid; 2022 break; 2023 } 2024 } 2025 assert_LU_OK; 2026 } 2027 2028 // Sneak up on the value with a linear search of length ~16. 2029 while (true) { 2030 assert_LU_OK; 2031 mid = lower + 1; 2032 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2033 if (mid->pc_offset() < pc_offset) { 2034 lower = mid; 2035 } else { 2036 upper = mid; 2037 break; 2038 } 2039 } 2040 #undef assert_LU_OK 2041 2042 if (match_desc(upper, pc_offset, approximate)) { 2043 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2044 _pc_desc_cache.add_pc_desc(upper); 2045 return upper; 2046 } else { 2047 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2048 return NULL; 2049 } 2050 } 2051 2052 2053 bool nmethod::check_all_dependencies() { 2054 bool found_check = false; 2055 // wholesale check of all dependencies 2056 for (Dependencies::DepStream deps(this); deps.next(); ) { 2057 if (deps.check_dependency() != NULL) { 2058 found_check = true; 2059 NOT_DEBUG(break); 2060 } 2061 } 2062 return found_check; // tell caller if we found anything 2063 } 2064 2065 bool nmethod::check_dependency_on(DepChange& changes) { 2066 // What has happened: 2067 // 1) a new class dependee has been added 2068 // 2) dependee and all its super classes have been marked 2069 bool found_check = false; // set true if we are upset 2070 for (Dependencies::DepStream deps(this); deps.next(); ) { 2071 // Evaluate only relevant dependencies. 2072 if (deps.spot_check_dependency_at(changes) != NULL) { 2073 found_check = true; 2074 NOT_DEBUG(break); 2075 } 2076 } 2077 return found_check; 2078 } 2079 2080 bool nmethod::is_evol_dependent_on(klassOop dependee) { 2081 instanceKlass *dependee_ik = instanceKlass::cast(dependee); 2082 objArrayOop dependee_methods = dependee_ik->methods(); 2083 for (Dependencies::DepStream deps(this); deps.next(); ) { 2084 if (deps.type() == Dependencies::evol_method) { 2085 methodOop method = deps.method_argument(0); 2086 for (int j = 0; j < dependee_methods->length(); j++) { 2087 if ((methodOop) dependee_methods->obj_at(j) == method) { 2088 // RC_TRACE macro has an embedded ResourceMark 2089 RC_TRACE(0x01000000, 2090 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2091 _method->method_holder()->klass_part()->external_name(), 2092 _method->name()->as_C_string(), 2093 _method->signature()->as_C_string(), compile_id(), 2094 method->method_holder()->klass_part()->external_name(), 2095 method->name()->as_C_string(), 2096 method->signature()->as_C_string())); 2097 if (TraceDependencies || LogCompilation) 2098 deps.log_dependency(dependee); 2099 return true; 2100 } 2101 } 2102 } 2103 } 2104 return false; 2105 } 2106 2107 // Called from mark_for_deoptimization, when dependee is invalidated. 2108 bool nmethod::is_dependent_on_method(methodOop dependee) { 2109 for (Dependencies::DepStream deps(this); deps.next(); ) { 2110 if (deps.type() != Dependencies::evol_method) 2111 continue; 2112 methodOop method = deps.method_argument(0); 2113 if (method == dependee) return true; 2114 } 2115 return false; 2116 } 2117 2118 2119 bool nmethod::is_patchable_at(address instr_addr) { 2120 assert(insts_contains(instr_addr), "wrong nmethod used"); 2121 if (is_zombie()) { 2122 // a zombie may never be patched 2123 return false; 2124 } 2125 return true; 2126 } 2127 2128 2129 address nmethod::continuation_for_implicit_exception(address pc) { 2130 // Exception happened outside inline-cache check code => we are inside 2131 // an active nmethod => use cpc to determine a return address 2132 int exception_offset = pc - code_begin(); 2133 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2134 #ifdef ASSERT 2135 if (cont_offset == 0) { 2136 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2137 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2138 HandleMark hm(thread); 2139 ResourceMark rm(thread); 2140 CodeBlob* cb = CodeCache::find_blob(pc); 2141 assert(cb != NULL && cb == this, ""); 2142 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2143 print(); 2144 method()->print_codes(); 2145 print_code(); 2146 print_pcs(); 2147 } 2148 #endif 2149 if (cont_offset == 0) { 2150 // Let the normal error handling report the exception 2151 return NULL; 2152 } 2153 return code_begin() + cont_offset; 2154 } 2155 2156 2157 2158 void nmethod_init() { 2159 // make sure you didn't forget to adjust the filler fields 2160 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2161 } 2162 2163 2164 //------------------------------------------------------------------------------------------- 2165 2166 2167 // QQQ might we make this work from a frame?? 2168 nmethodLocker::nmethodLocker(address pc) { 2169 CodeBlob* cb = CodeCache::find_blob(pc); 2170 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2171 _nm = (nmethod*)cb; 2172 lock_nmethod(_nm); 2173 } 2174 2175 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2176 // should pass zombie_ok == true. 2177 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2178 if (nm == NULL) return; 2179 Atomic::inc(&nm->_lock_count); 2180 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2181 } 2182 2183 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2184 if (nm == NULL) return; 2185 Atomic::dec(&nm->_lock_count); 2186 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2187 } 2188 2189 2190 // ----------------------------------------------------------------------------- 2191 // nmethod::get_deopt_original_pc 2192 // 2193 // Return the original PC for the given PC if: 2194 // (a) the given PC belongs to a nmethod and 2195 // (b) it is a deopt PC 2196 address nmethod::get_deopt_original_pc(const frame* fr) { 2197 if (fr->cb() == NULL) return NULL; 2198 2199 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2200 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2201 return nm->get_original_pc(fr); 2202 2203 return NULL; 2204 } 2205 2206 2207 // ----------------------------------------------------------------------------- 2208 // MethodHandle 2209 2210 bool nmethod::is_method_handle_return(address return_pc) { 2211 if (!has_method_handle_invokes()) return false; 2212 PcDesc* pd = pc_desc_at(return_pc); 2213 if (pd == NULL) 2214 return false; 2215 return pd->is_method_handle_invoke(); 2216 } 2217 2218 2219 // ----------------------------------------------------------------------------- 2220 // Verification 2221 2222 class VerifyOopsClosure: public OopClosure { 2223 nmethod* _nm; 2224 bool _ok; 2225 public: 2226 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2227 bool ok() { return _ok; } 2228 virtual void do_oop(oop* p) { 2229 if ((*p) == NULL || (*p)->is_oop()) return; 2230 if (_ok) { 2231 _nm->print_nmethod(true); 2232 _ok = false; 2233 } 2234 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2235 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2236 } 2237 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2238 }; 2239 2240 void nmethod::verify() { 2241 2242 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2243 // seems odd. 2244 2245 if( is_zombie() || is_not_entrant() ) 2246 return; 2247 2248 // Make sure all the entry points are correctly aligned for patching. 2249 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2250 2251 assert(method()->is_oop(), "must be valid"); 2252 2253 ResourceMark rm; 2254 2255 if (!CodeCache::contains(this)) { 2256 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2257 } 2258 2259 if(is_native_method() ) 2260 return; 2261 2262 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2263 if (nm != this) { 2264 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2265 this)); 2266 } 2267 2268 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2269 if (! p->verify(this)) { 2270 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2271 } 2272 } 2273 2274 VerifyOopsClosure voc(this); 2275 oops_do(&voc); 2276 assert(voc.ok(), "embedded oops must be OK"); 2277 verify_scavenge_root_oops(); 2278 2279 verify_scopes(); 2280 } 2281 2282 2283 void nmethod::verify_interrupt_point(address call_site) { 2284 // This code does not work in release mode since 2285 // owns_lock only is available in debug mode. 2286 CompiledIC* ic = NULL; 2287 Thread *cur = Thread::current(); 2288 if (CompiledIC_lock->owner() == cur || 2289 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2290 SafepointSynchronize::is_at_safepoint())) { 2291 ic = CompiledIC_at(call_site); 2292 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2293 } else { 2294 MutexLocker ml_verify (CompiledIC_lock); 2295 ic = CompiledIC_at(call_site); 2296 } 2297 PcDesc* pd = pc_desc_at(ic->end_of_call()); 2298 assert(pd != NULL, "PcDesc must exist"); 2299 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2300 pd->obj_decode_offset(), pd->should_reexecute(), 2301 pd->return_oop()); 2302 !sd->is_top(); sd = sd->sender()) { 2303 sd->verify(); 2304 } 2305 } 2306 2307 void nmethod::verify_scopes() { 2308 if( !method() ) return; // Runtime stubs have no scope 2309 if (method()->is_native()) return; // Ignore stub methods. 2310 // iterate through all interrupt point 2311 // and verify the debug information is valid. 2312 RelocIterator iter((nmethod*)this); 2313 while (iter.next()) { 2314 address stub = NULL; 2315 switch (iter.type()) { 2316 case relocInfo::virtual_call_type: 2317 verify_interrupt_point(iter.addr()); 2318 break; 2319 case relocInfo::opt_virtual_call_type: 2320 stub = iter.opt_virtual_call_reloc()->static_stub(); 2321 verify_interrupt_point(iter.addr()); 2322 break; 2323 case relocInfo::static_call_type: 2324 stub = iter.static_call_reloc()->static_stub(); 2325 //verify_interrupt_point(iter.addr()); 2326 break; 2327 case relocInfo::runtime_call_type: 2328 address destination = iter.reloc()->value(); 2329 // Right now there is no way to find out which entries support 2330 // an interrupt point. It would be nice if we had this 2331 // information in a table. 2332 break; 2333 } 2334 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2335 } 2336 } 2337 2338 2339 // ----------------------------------------------------------------------------- 2340 // Non-product code 2341 #ifndef PRODUCT 2342 2343 class DebugScavengeRoot: public OopClosure { 2344 nmethod* _nm; 2345 bool _ok; 2346 public: 2347 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2348 bool ok() { return _ok; } 2349 virtual void do_oop(oop* p) { 2350 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2351 if (_ok) { 2352 _nm->print_nmethod(true); 2353 _ok = false; 2354 } 2355 tty->print_cr("*** non-perm oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2356 (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2357 (*p)->print(); 2358 } 2359 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2360 }; 2361 2362 void nmethod::verify_scavenge_root_oops() { 2363 if (!on_scavenge_root_list()) { 2364 // Actually look inside, to verify the claim that it's clean. 2365 DebugScavengeRoot debug_scavenge_root(this); 2366 oops_do(&debug_scavenge_root); 2367 if (!debug_scavenge_root.ok()) 2368 fatal("found an unadvertised bad non-perm oop in the code cache"); 2369 } 2370 assert(scavenge_root_not_marked(), ""); 2371 } 2372 2373 #endif // PRODUCT 2374 2375 // Printing operations 2376 2377 void nmethod::print() const { 2378 ResourceMark rm; 2379 ttyLocker ttyl; // keep the following output all in one block 2380 2381 tty->print("Compiled "); 2382 2383 if (is_compiled_by_c1()) { 2384 tty->print("(c1) "); 2385 } else if (is_compiled_by_c2()) { 2386 tty->print("(c2) "); 2387 } else if (is_compiled_by_shark()) { 2388 tty->print("(shark) "); 2389 } else { 2390 tty->print("(nm) "); 2391 } 2392 2393 print_on(tty, "nmethod"); 2394 tty->cr(); 2395 if (WizardMode) { 2396 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2397 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2398 tty->print(" { "); 2399 if (is_in_use()) tty->print("in_use "); 2400 if (is_not_entrant()) tty->print("not_entrant "); 2401 if (is_zombie()) tty->print("zombie "); 2402 if (is_unloaded()) tty->print("unloaded "); 2403 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2404 tty->print_cr("}:"); 2405 } 2406 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2407 (address)this, 2408 (address)this + size(), 2409 size()); 2410 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2411 relocation_begin(), 2412 relocation_end(), 2413 relocation_size()); 2414 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2415 consts_begin(), 2416 consts_end(), 2417 consts_size()); 2418 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2419 insts_begin(), 2420 insts_end(), 2421 insts_size()); 2422 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2423 stub_begin(), 2424 stub_end(), 2425 stub_size()); 2426 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2427 oops_begin(), 2428 oops_end(), 2429 oops_size()); 2430 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2431 scopes_data_begin(), 2432 scopes_data_end(), 2433 scopes_data_size()); 2434 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2435 scopes_pcs_begin(), 2436 scopes_pcs_end(), 2437 scopes_pcs_size()); 2438 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2439 dependencies_begin(), 2440 dependencies_end(), 2441 dependencies_size()); 2442 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2443 handler_table_begin(), 2444 handler_table_end(), 2445 handler_table_size()); 2446 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2447 nul_chk_table_begin(), 2448 nul_chk_table_end(), 2449 nul_chk_table_size()); 2450 } 2451 2452 void nmethod::print_code() { 2453 HandleMark hm; 2454 ResourceMark m; 2455 Disassembler::decode(this); 2456 } 2457 2458 2459 #ifndef PRODUCT 2460 2461 void nmethod::print_scopes() { 2462 // Find the first pc desc for all scopes in the code and print it. 2463 ResourceMark rm; 2464 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2465 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2466 continue; 2467 2468 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2469 sd->print_on(tty, p); 2470 } 2471 } 2472 2473 void nmethod::print_dependencies() { 2474 ResourceMark rm; 2475 ttyLocker ttyl; // keep the following output all in one block 2476 tty->print_cr("Dependencies:"); 2477 for (Dependencies::DepStream deps(this); deps.next(); ) { 2478 deps.print_dependency(); 2479 klassOop ctxk = deps.context_type(); 2480 if (ctxk != NULL) { 2481 Klass* k = Klass::cast(ctxk); 2482 if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { 2483 tty->print_cr(" [nmethod<=klass]%s", k->external_name()); 2484 } 2485 } 2486 deps.log_dependency(); // put it into the xml log also 2487 } 2488 } 2489 2490 2491 void nmethod::print_relocations() { 2492 ResourceMark m; // in case methods get printed via the debugger 2493 tty->print_cr("relocations:"); 2494 RelocIterator iter(this); 2495 iter.print(); 2496 if (UseRelocIndex) { 2497 jint* index_end = (jint*)relocation_end() - 1; 2498 jint index_size = *index_end; 2499 jint* index_start = (jint*)( (address)index_end - index_size ); 2500 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2501 if (index_size > 0) { 2502 jint* ip; 2503 for (ip = index_start; ip+2 <= index_end; ip += 2) 2504 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2505 ip[0], 2506 ip[1], 2507 header_end()+ip[0], 2508 relocation_begin()-1+ip[1]); 2509 for (; ip < index_end; ip++) 2510 tty->print_cr(" (%d ?)", ip[0]); 2511 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); 2512 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2513 } 2514 } 2515 } 2516 2517 2518 void nmethod::print_pcs() { 2519 ResourceMark m; // in case methods get printed via debugger 2520 tty->print_cr("pc-bytecode offsets:"); 2521 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2522 p->print(this); 2523 } 2524 } 2525 2526 #endif // PRODUCT 2527 2528 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2529 RelocIterator iter(this, begin, end); 2530 bool have_one = false; 2531 while (iter.next()) { 2532 have_one = true; 2533 switch (iter.type()) { 2534 case relocInfo::none: return "no_reloc"; 2535 case relocInfo::oop_type: { 2536 stringStream st; 2537 oop_Relocation* r = iter.oop_reloc(); 2538 oop obj = r->oop_value(); 2539 st.print("oop("); 2540 if (obj == NULL) st.print("NULL"); 2541 else obj->print_value_on(&st); 2542 st.print(")"); 2543 return st.as_string(); 2544 } 2545 case relocInfo::virtual_call_type: return "virtual_call"; 2546 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2547 case relocInfo::static_call_type: return "static_call"; 2548 case relocInfo::static_stub_type: return "static_stub"; 2549 case relocInfo::runtime_call_type: return "runtime_call"; 2550 case relocInfo::external_word_type: return "external_word"; 2551 case relocInfo::internal_word_type: return "internal_word"; 2552 case relocInfo::section_word_type: return "section_word"; 2553 case relocInfo::poll_type: return "poll"; 2554 case relocInfo::poll_return_type: return "poll_return"; 2555 case relocInfo::type_mask: return "type_bit_mask"; 2556 } 2557 } 2558 return have_one ? "other" : NULL; 2559 } 2560 2561 // Return a the last scope in (begin..end] 2562 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2563 PcDesc* p = pc_desc_near(begin+1); 2564 if (p != NULL && p->real_pc(this) <= end) { 2565 return new ScopeDesc(this, p->scope_decode_offset(), 2566 p->obj_decode_offset(), p->should_reexecute(), 2567 p->return_oop()); 2568 } 2569 return NULL; 2570 } 2571 2572 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) { 2573 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2574 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2575 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2576 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2577 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2578 2579 if (has_method_handle_invokes()) 2580 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2581 2582 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2583 2584 if (block_begin == entry_point()) { 2585 methodHandle m = method(); 2586 if (m.not_null()) { 2587 stream->print(" # "); 2588 m->print_value_on(stream); 2589 stream->cr(); 2590 } 2591 if (m.not_null() && !is_osr_method()) { 2592 ResourceMark rm; 2593 int sizeargs = m->size_of_parameters(); 2594 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2595 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2596 { 2597 int sig_index = 0; 2598 if (!m->is_static()) 2599 sig_bt[sig_index++] = T_OBJECT; // 'this' 2600 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2601 BasicType t = ss.type(); 2602 sig_bt[sig_index++] = t; 2603 if (type2size[t] == 2) { 2604 sig_bt[sig_index++] = T_VOID; 2605 } else { 2606 assert(type2size[t] == 1, "size is 1 or 2"); 2607 } 2608 } 2609 assert(sig_index == sizeargs, ""); 2610 } 2611 const char* spname = "sp"; // make arch-specific? 2612 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2613 int stack_slot_offset = this->frame_size() * wordSize; 2614 int tab1 = 14, tab2 = 24; 2615 int sig_index = 0; 2616 int arg_index = (m->is_static() ? 0 : -1); 2617 bool did_old_sp = false; 2618 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2619 bool at_this = (arg_index == -1); 2620 bool at_old_sp = false; 2621 BasicType t = (at_this ? T_OBJECT : ss.type()); 2622 assert(t == sig_bt[sig_index], "sigs in sync"); 2623 if (at_this) 2624 stream->print(" # this: "); 2625 else 2626 stream->print(" # parm%d: ", arg_index); 2627 stream->move_to(tab1); 2628 VMReg fst = regs[sig_index].first(); 2629 VMReg snd = regs[sig_index].second(); 2630 if (fst->is_reg()) { 2631 stream->print("%s", fst->name()); 2632 if (snd->is_valid()) { 2633 stream->print(":%s", snd->name()); 2634 } 2635 } else if (fst->is_stack()) { 2636 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2637 if (offset == stack_slot_offset) at_old_sp = true; 2638 stream->print("[%s+0x%x]", spname, offset); 2639 } else { 2640 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2641 } 2642 stream->print(" "); 2643 stream->move_to(tab2); 2644 stream->print("= "); 2645 if (at_this) { 2646 m->method_holder()->print_value_on(stream); 2647 } else { 2648 bool did_name = false; 2649 if (!at_this && ss.is_object()) { 2650 Symbol* name = ss.as_symbol_or_null(); 2651 if (name != NULL) { 2652 name->print_value_on(stream); 2653 did_name = true; 2654 } 2655 } 2656 if (!did_name) 2657 stream->print("%s", type2name(t)); 2658 } 2659 if (at_old_sp) { 2660 stream->print(" (%s of caller)", spname); 2661 did_old_sp = true; 2662 } 2663 stream->cr(); 2664 sig_index += type2size[t]; 2665 arg_index += 1; 2666 if (!at_this) ss.next(); 2667 } 2668 if (!did_old_sp) { 2669 stream->print(" # "); 2670 stream->move_to(tab1); 2671 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2672 stream->print(" (%s of caller)", spname); 2673 stream->cr(); 2674 } 2675 } 2676 } 2677 } 2678 2679 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2680 // First, find an oopmap in (begin, end]. 2681 // We use the odd half-closed interval so that oop maps and scope descs 2682 // which are tied to the byte after a call are printed with the call itself. 2683 address base = code_begin(); 2684 OopMapSet* oms = oop_maps(); 2685 if (oms != NULL) { 2686 for (int i = 0, imax = oms->size(); i < imax; i++) { 2687 OopMap* om = oms->at(i); 2688 address pc = base + om->offset(); 2689 if (pc > begin) { 2690 if (pc <= end) { 2691 st->move_to(column); 2692 st->print("; "); 2693 om->print_on(st); 2694 } 2695 break; 2696 } 2697 } 2698 } 2699 2700 // Print any debug info present at this pc. 2701 ScopeDesc* sd = scope_desc_in(begin, end); 2702 if (sd != NULL) { 2703 st->move_to(column); 2704 if (sd->bci() == SynchronizationEntryBCI) { 2705 st->print(";*synchronization entry"); 2706 } else { 2707 if (sd->method().is_null()) { 2708 st->print("method is NULL"); 2709 } else if (sd->method()->is_native()) { 2710 st->print("method is native"); 2711 } else { 2712 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2713 st->print(";*%s", Bytecodes::name(bc)); 2714 switch (bc) { 2715 case Bytecodes::_invokevirtual: 2716 case Bytecodes::_invokespecial: 2717 case Bytecodes::_invokestatic: 2718 case Bytecodes::_invokeinterface: 2719 { 2720 Bytecode_invoke invoke(sd->method(), sd->bci()); 2721 st->print(" "); 2722 if (invoke.name() != NULL) 2723 invoke.name()->print_symbol_on(st); 2724 else 2725 st->print("<UNKNOWN>"); 2726 break; 2727 } 2728 case Bytecodes::_getfield: 2729 case Bytecodes::_putfield: 2730 case Bytecodes::_getstatic: 2731 case Bytecodes::_putstatic: 2732 { 2733 Bytecode_field field(sd->method(), sd->bci()); 2734 st->print(" "); 2735 if (field.name() != NULL) 2736 field.name()->print_symbol_on(st); 2737 else 2738 st->print("<UNKNOWN>"); 2739 } 2740 } 2741 } 2742 } 2743 2744 // Print all scopes 2745 for (;sd != NULL; sd = sd->sender()) { 2746 st->move_to(column); 2747 st->print("; -"); 2748 if (sd->method().is_null()) { 2749 st->print("method is NULL"); 2750 } else { 2751 sd->method()->print_short_name(st); 2752 } 2753 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2754 if (lineno != -1) { 2755 st->print("@%d (line %d)", sd->bci(), lineno); 2756 } else { 2757 st->print("@%d", sd->bci()); 2758 } 2759 st->cr(); 2760 } 2761 } 2762 2763 // Print relocation information 2764 const char* str = reloc_string_for(begin, end); 2765 if (str != NULL) { 2766 if (sd != NULL) st->cr(); 2767 st->move_to(column); 2768 st->print("; {%s}", str); 2769 } 2770 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2771 if (cont_offset != 0) { 2772 st->move_to(column); 2773 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 2774 } 2775 2776 } 2777 2778 #ifndef PRODUCT 2779 2780 void nmethod::print_value_on(outputStream* st) const { 2781 print_on(st, "nmethod"); 2782 } 2783 2784 void nmethod::print_calls(outputStream* st) { 2785 RelocIterator iter(this); 2786 while (iter.next()) { 2787 switch (iter.type()) { 2788 case relocInfo::virtual_call_type: 2789 case relocInfo::opt_virtual_call_type: { 2790 VerifyMutexLocker mc(CompiledIC_lock); 2791 CompiledIC_at(iter.reloc())->print(); 2792 break; 2793 } 2794 case relocInfo::static_call_type: 2795 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 2796 compiledStaticCall_at(iter.reloc())->print(); 2797 break; 2798 } 2799 } 2800 } 2801 2802 void nmethod::print_handler_table() { 2803 ExceptionHandlerTable(this).print(); 2804 } 2805 2806 void nmethod::print_nul_chk_table() { 2807 ImplicitExceptionTable(this).print(code_begin()); 2808 } 2809 2810 void nmethod::print_statistics() { 2811 ttyLocker ttyl; 2812 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2813 nmethod_stats.print_native_nmethod_stats(); 2814 nmethod_stats.print_nmethod_stats(); 2815 DebugInformationRecorder::print_statistics(); 2816 nmethod_stats.print_pc_stats(); 2817 Dependencies::print_statistics(); 2818 if (xtty != NULL) xtty->tail("statistics"); 2819 } 2820 2821 #endif // PRODUCT