nmethod.cpp revision 6646:b596a1063e90
11539Srgrimes/* 21539Srgrimes * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 31539Srgrimes * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 41539Srgrimes * 51539Srgrimes * This code is free software; you can redistribute it and/or modify it 61539Srgrimes * under the terms of the GNU General Public License version 2 only, as 71539Srgrimes * published by the Free Software Foundation. 81539Srgrimes * 91539Srgrimes * This code is distributed in the hope that it will be useful, but WITHOUT 101539Srgrimes * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 111539Srgrimes * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 121539Srgrimes * version 2 for more details (a copy is included in the LICENSE file that 131539Srgrimes * accompanied this code). 141539Srgrimes * 151539Srgrimes * You should have received a copy of the GNU General Public License version 161539Srgrimes * 2 along with this work; if not, write to the Free Software Foundation, 171539Srgrimes * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 181539Srgrimes * 191539Srgrimes * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 201539Srgrimes * or visit www.oracle.com if you need additional information or have any 211539Srgrimes * questions. 221539Srgrimes * 231539Srgrimes */ 241539Srgrimes 251539Srgrimes#include "precompiled.hpp" 261539Srgrimes#include "code/codeCache.hpp" 271539Srgrimes#include "code/compiledIC.hpp" 281539Srgrimes#include "code/dependencies.hpp" 291539Srgrimes#include "code/nmethod.hpp" 301539Srgrimes#include "code/scopeDesc.hpp" 311539Srgrimes#include "compiler/abstractCompiler.hpp" 321539Srgrimes#include "compiler/compileBroker.hpp" 331539Srgrimes#include "compiler/compileLog.hpp" 341539Srgrimes#include "compiler/compilerOracle.hpp" 351539Srgrimes#include "compiler/disassembler.hpp" 361539Srgrimes#include "interpreter/bytecode.hpp" 371539Srgrimes#include "oops/methodData.hpp" 381539Srgrimes#include "prims/jvmtiRedefineClassesTrace.hpp" 391539Srgrimes#include "prims/jvmtiImpl.hpp" 401539Srgrimes#include "runtime/atomic.inline.hpp" 411539Srgrimes#include "runtime/orderAccess.inline.hpp" 4254746Sphantom#include "runtime/sharedRuntime.hpp" 431539Srgrimes#include "runtime/sweeper.hpp" 441539Srgrimes#include "utilities/resourceHash.hpp" 457655Sbde#include "utilities/dtrace.hpp" 467655Sbde#include "utilities/events.hpp" 471539Srgrimes#include "utilities/xmlstream.hpp" 487655Sbde#ifdef SHARK 497655Sbde#include "shark/sharkCompiler.hpp" 507655Sbde#endif 517655Sbde 521539SrgrimesPRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 531539Srgrimes 5457035Sobrien#ifdef DTRACE_ENABLED 5557035Sobrien 5657035Sobrien// Only bother with this argument setup if dtrace is available 5757035Sobrien 5857035Sobrien#define DTRACE_METHOD_UNLOAD_PROBE(method) \ 5957035Sobrien { \ 6057035Sobrien Method* m = (method); \ 6157035Sobrien if (m != NULL) { \ 6257035Sobrien Symbol* klass_name = m->klass_name(); \ 6357035Sobrien Symbol* name = m->name(); \ 6457035Sobrien Symbol* signature = m->signature(); \ 6557035Sobrien HOTSPOT_COMPILED_METHOD_UNLOAD( \ 6657035Sobrien (char *) klass_name->bytes(), klass_name->utf8_length(), \ 6757035Sobrien (char *) name->bytes(), name->utf8_length(), \ 681539Srgrimes (char *) signature->bytes(), signature->utf8_length()); \ 697655Sbde } \ 707655Sbde } 717655Sbde 727655Sbde#else // ndef DTRACE_ENABLED 737655Sbde 747655Sbde#define DTRACE_METHOD_UNLOAD_PROBE(method) 757655Sbde 767655Sbde#endif 777655Sbde 787655Sbdebool nmethod::is_compiled_by_c1() const { 797655Sbde if (compiler() == NULL) { 807655Sbde return false; 817655Sbde } 827655Sbde return compiler()->is_c1(); 831539Srgrimes} 841539Srgrimesbool nmethod::is_compiled_by_c2() const { 8554746Sphantom if (compiler() == NULL) { 867655Sbde return false; 877655Sbde } 8854746Sphantom return compiler()->is_c2(); 8954746Sphantom} 9054746Sphantombool nmethod::is_compiled_by_shark() const { 9154746Sphantom if (compiler() == NULL) { 9254746Sphantom return false; 9354746Sphantom } 947655Sbde return compiler()->is_shark(); 957655Sbde} 967655Sbde 977655Sbde 9857035Sobrien 9957035Sobrien//--------------------------------------------------------------------------------- 10057035Sobrien// NMethod statistics 10157035Sobrien// They are printed under various flags, including: 10257035Sobrien// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 10357035Sobrien// (In the latter two cases, they like other stats are printed to the log only.) 10457035Sobrien 10557035Sobrien#ifndef PRODUCT 10657035Sobrien// These variables are put into one block to reduce relocations 10757035Sobrien// and make it simpler to print from the debugger. 10857035Sobrienstatic 1097655Sbdestruct nmethod_stats_struct { 1107655Sbde int nmethod_count; 1117655Sbde int total_size; 1127655Sbde int relocation_size; 11354746Sphantom int consts_size; 1147655Sbde int insts_size; 11557035Sobrien int stub_size; 11657035Sobrien int scopes_data_size; 11757035Sobrien int scopes_pcs_size; 11857035Sobrien int dependencies_size; 11957035Sobrien int handler_table_size; 1207655Sbde int nul_chk_table_size; 12157035Sobrien int oops_size; 12254746Sphantom 1231539Srgrimes void note_nmethod(nmethod* nm) { 1241539Srgrimes nmethod_count += 1; 12515483Sbde total_size += nm->size(); 1261539Srgrimes relocation_size += nm->relocation_size(); 12715483Sbde consts_size += nm->consts_size(); 12815483Sbde insts_size += nm->insts_size(); 12915483Sbde stub_size += nm->stub_size(); 1301539Srgrimes oops_size += nm->oops_size(); 1311539Srgrimes scopes_data_size += nm->scopes_data_size(); 1321539Srgrimes scopes_pcs_size += nm->scopes_pcs_size(); 1337655Sbde dependencies_size += nm->dependencies_size(); 1347655Sbde handler_table_size += nm->handler_table_size(); 1351539Srgrimes nul_chk_table_size += nm->nul_chk_table_size(); 1367655Sbde } 1377655Sbde void print_nmethod_stats() { 1387655Sbde if (nmethod_count == 0) return; 1397655Sbde tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 1401539Srgrimes if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 1411539Srgrimes if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 1427655Sbde if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 1437655Sbde if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 1447655Sbde if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 1457655Sbde if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 1467655Sbde if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 1471539Srgrimes if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 14829883Sache if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 1491539Srgrimes if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 15029855Sache if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 15129855Sache } 1521539Srgrimes 1531539Srgrimes int native_nmethod_count; 1541539Srgrimes int native_total_size; 15590231Sbbraun int native_relocation_size; 15690231Sbbraun int native_insts_size; 15790231Sbbraun int native_oops_size; 15890231Sbbraun void note_native_nmethod(nmethod* nm) { 15990231Sbbraun native_nmethod_count += 1; 16090231Sbbraun native_total_size += nm->size(); 16115483Sbde native_relocation_size += nm->relocation_size(); 1621539Srgrimes native_insts_size += nm->insts_size(); 16312028Sache native_oops_size += nm->oops_size(); 16429883Sache } 1651539Srgrimes void print_native_nmethod_stats() { 1661539Srgrimes if (native_nmethod_count == 0) return; 16715483Sbde tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 16815483Sbde if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 1691539Srgrimes if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 17014813Sache if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 17112028Sache if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 1721539Srgrimes } 1731539Srgrimes 17415483Sbde int pc_desc_resets; // number of resets (= number of caches) 17515483Sbde int pc_desc_queries; // queries to nmethod::find_pc_desc 1761539Srgrimes int pc_desc_approx; // number of those which have approximate true 17714813Sache int pc_desc_repeats; // number of _pc_descs[0] hits 17812028Sache int pc_desc_hits; // number of LRU cache hits 1791539Srgrimes int pc_desc_tests; // total number of PcDesc examinations 1801539Srgrimes int pc_desc_searches; // total number of quasi-binary search steps 1817655Sbde int pc_desc_adds; // number of LUR cache insertions 1821539Srgrimes 1831539Srgrimes void print_pc_stats() { 18429883Sache tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 18590231Sbbraun pc_desc_queries, 18615483Sbde (double)(pc_desc_tests + pc_desc_searches) 18715483Sbde / pc_desc_queries); 18815483Sbde tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 1891539Srgrimes pc_desc_resets, 1907655Sbde pc_desc_queries, pc_desc_approx, 1911539Srgrimes pc_desc_repeats, pc_desc_hits, 1921539Srgrimes pc_desc_tests, pc_desc_searches, pc_desc_adds); 193 } 194} nmethod_stats; 195#endif //PRODUCT 196 197 198//--------------------------------------------------------------------------------- 199 200 201ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 202 assert(pc != NULL, "Must be non null"); 203 assert(exception.not_null(), "Must be non null"); 204 assert(handler != NULL, "Must be non null"); 205 206 _count = 0; 207 _exception_type = exception->klass(); 208 _next = NULL; 209 210 add_address_and_handler(pc,handler); 211} 212 213 214address ExceptionCache::match(Handle exception, address pc) { 215 assert(pc != NULL,"Must be non null"); 216 assert(exception.not_null(),"Must be non null"); 217 if (exception->klass() == exception_type()) { 218 return (test_address(pc)); 219 } 220 221 return NULL; 222} 223 224 225bool ExceptionCache::match_exception_with_space(Handle exception) { 226 assert(exception.not_null(),"Must be non null"); 227 if (exception->klass() == exception_type() && count() < cache_size) { 228 return true; 229 } 230 return false; 231} 232 233 234address ExceptionCache::test_address(address addr) { 235 for (int i=0; i<count(); i++) { 236 if (pc_at(i) == addr) { 237 return handler_at(i); 238 } 239 } 240 return NULL; 241} 242 243 244bool ExceptionCache::add_address_and_handler(address addr, address handler) { 245 if (test_address(addr) == handler) return true; 246 if (count() < cache_size) { 247 set_pc_at(count(),addr); 248 set_handler_at(count(), handler); 249 increment_count(); 250 return true; 251 } 252 return false; 253} 254 255 256// private method for handling exception cache 257// These methods are private, and used to manipulate the exception cache 258// directly. 259ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 260 ExceptionCache* ec = exception_cache(); 261 while (ec != NULL) { 262 if (ec->match_exception_with_space(exception)) { 263 return ec; 264 } 265 ec = ec->next(); 266 } 267 return NULL; 268} 269 270 271//----------------------------------------------------------------------------- 272 273 274// Helper used by both find_pc_desc methods. 275static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 276 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 277 if (!approximate) 278 return pc->pc_offset() == pc_offset; 279 else 280 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 281} 282 283void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 284 if (initial_pc_desc == NULL) { 285 _pc_descs[0] = NULL; // native method; no PcDescs at all 286 return; 287 } 288 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 289 // reset the cache by filling it with benign (non-null) values 290 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 291 for (int i = 0; i < cache_size; i++) 292 _pc_descs[i] = initial_pc_desc; 293} 294 295PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 296 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 297 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 298 299 // Note: one might think that caching the most recently 300 // read value separately would be a win, but one would be 301 // wrong. When many threads are updating it, the cache 302 // line it's in would bounce between caches, negating 303 // any benefit. 304 305 // In order to prevent race conditions do not load cache elements 306 // repeatedly, but use a local copy: 307 PcDesc* res; 308 309 // Step one: Check the most recently added value. 310 res = _pc_descs[0]; 311 if (res == NULL) return NULL; // native method; no PcDescs at all 312 if (match_desc(res, pc_offset, approximate)) { 313 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 314 return res; 315 } 316 317 // Step two: Check the rest of the LRU cache. 318 for (int i = 1; i < cache_size; ++i) { 319 res = _pc_descs[i]; 320 if (res->pc_offset() < 0) break; // optimization: skip empty cache 321 if (match_desc(res, pc_offset, approximate)) { 322 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 323 return res; 324 } 325 } 326 327 // Report failure. 328 return NULL; 329} 330 331void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 332 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 333 // Update the LRU cache by shifting pc_desc forward. 334 for (int i = 0; i < cache_size; i++) { 335 PcDesc* next = _pc_descs[i]; 336 _pc_descs[i] = pc_desc; 337 pc_desc = next; 338 } 339} 340 341// adjust pcs_size so that it is a multiple of both oopSize and 342// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 343// of oopSize, then 2*sizeof(PcDesc) is) 344static int adjust_pcs_size(int pcs_size) { 345 int nsize = round_to(pcs_size, oopSize); 346 if ((nsize % sizeof(PcDesc)) != 0) { 347 nsize = pcs_size + sizeof(PcDesc); 348 } 349 assert((nsize % oopSize) == 0, "correct alignment"); 350 return nsize; 351} 352 353//----------------------------------------------------------------------------- 354 355 356void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 357 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 358 assert(new_entry != NULL,"Must be non null"); 359 assert(new_entry->next() == NULL, "Must be null"); 360 361 if (exception_cache() != NULL) { 362 new_entry->set_next(exception_cache()); 363 } 364 set_exception_cache(new_entry); 365} 366 367void nmethod::remove_from_exception_cache(ExceptionCache* ec) { 368 ExceptionCache* prev = NULL; 369 ExceptionCache* curr = exception_cache(); 370 assert(curr != NULL, "nothing to remove"); 371 // find the previous and next entry of ec 372 while (curr != ec) { 373 prev = curr; 374 curr = curr->next(); 375 assert(curr != NULL, "ExceptionCache not found"); 376 } 377 // now: curr == ec 378 ExceptionCache* next = curr->next(); 379 if (prev == NULL) { 380 set_exception_cache(next); 381 } else { 382 prev->set_next(next); 383 } 384 delete curr; 385} 386 387 388// public method for accessing the exception cache 389// These are the public access methods. 390address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 391 // We never grab a lock to read the exception cache, so we may 392 // have false negatives. This is okay, as it can only happen during 393 // the first few exception lookups for a given nmethod. 394 ExceptionCache* ec = exception_cache(); 395 while (ec != NULL) { 396 address ret_val; 397 if ((ret_val = ec->match(exception,pc)) != NULL) { 398 return ret_val; 399 } 400 ec = ec->next(); 401 } 402 return NULL; 403} 404 405 406void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 407 // There are potential race conditions during exception cache updates, so we 408 // must own the ExceptionCache_lock before doing ANY modifications. Because 409 // we don't lock during reads, it is possible to have several threads attempt 410 // to update the cache with the same data. We need to check for already inserted 411 // copies of the current data before adding it. 412 413 MutexLocker ml(ExceptionCache_lock); 414 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 415 416 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 417 target_entry = new ExceptionCache(exception,pc,handler); 418 add_exception_cache_entry(target_entry); 419 } 420} 421 422 423//-------------end of code for ExceptionCache-------------- 424 425 426int nmethod::total_size() const { 427 return 428 consts_size() + 429 insts_size() + 430 stub_size() + 431 scopes_data_size() + 432 scopes_pcs_size() + 433 handler_table_size() + 434 nul_chk_table_size(); 435} 436 437const char* nmethod::compile_kind() const { 438 if (is_osr_method()) return "osr"; 439 if (method() != NULL && is_native_method()) return "c2n"; 440 return NULL; 441} 442 443// Fill in default values for various flag fields 444void nmethod::init_defaults() { 445 _state = in_use; 446 _marked_for_reclamation = 0; 447 _has_flushed_dependencies = 0; 448 _has_unsafe_access = 0; 449 _has_method_handle_invokes = 0; 450 _lazy_critical_native = 0; 451 _has_wide_vectors = 0; 452 _marked_for_deoptimization = 0; 453 _lock_count = 0; 454 _stack_traversal_mark = 0; 455 _unload_reported = false; // jvmti state 456 457#ifdef ASSERT 458 _oops_are_stale = false; 459#endif 460 461 _oops_do_mark_link = NULL; 462 _jmethod_id = NULL; 463 _osr_link = NULL; 464 _scavenge_root_link = NULL; 465 _scavenge_root_state = 0; 466 _compiler = NULL; 467#if INCLUDE_RTM_OPT 468 _rtm_state = NoRTM; 469#endif 470#ifdef HAVE_DTRACE_H 471 _trap_offset = 0; 472#endif // def HAVE_DTRACE_H 473} 474 475nmethod* nmethod::new_native_nmethod(methodHandle method, 476 int compile_id, 477 CodeBuffer *code_buffer, 478 int vep_offset, 479 int frame_complete, 480 int frame_size, 481 ByteSize basic_lock_owner_sp_offset, 482 ByteSize basic_lock_sp_offset, 483 OopMapSet* oop_maps) { 484 code_buffer->finalize_oop_references(method); 485 // create nmethod 486 nmethod* nm = NULL; 487 { 488 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 489 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 490 CodeOffsets offsets; 491 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 492 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 493 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size, 494 compile_id, &offsets, 495 code_buffer, frame_size, 496 basic_lock_owner_sp_offset, 497 basic_lock_sp_offset, oop_maps); 498 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 499 if (PrintAssembly && nm != NULL) { 500 Disassembler::decode(nm); 501 } 502 } 503 // verify nmethod 504 debug_only(if (nm) nm->verify();) // might block 505 506 if (nm != NULL) { 507 nm->log_new_nmethod(); 508 } 509 510 return nm; 511} 512 513#ifdef HAVE_DTRACE_H 514nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 515 CodeBuffer *code_buffer, 516 int vep_offset, 517 int trap_offset, 518 int frame_complete, 519 int frame_size) { 520 code_buffer->finalize_oop_references(method); 521 // create nmethod 522 nmethod* nm = NULL; 523 { 524 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 525 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 526 CodeOffsets offsets; 527 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 528 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 529 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 530 531 nm = new (nmethod_size) nmethod(method(), nmethod_size, 532 &offsets, code_buffer, frame_size); 533 534 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 535 if (PrintAssembly && nm != NULL) { 536 Disassembler::decode(nm); 537 } 538 } 539 // verify nmethod 540 debug_only(if (nm) nm->verify();) // might block 541 542 if (nm != NULL) { 543 nm->log_new_nmethod(); 544 } 545 546 return nm; 547} 548 549#endif // def HAVE_DTRACE_H 550 551nmethod* nmethod::new_nmethod(methodHandle method, 552 int compile_id, 553 int entry_bci, 554 CodeOffsets* offsets, 555 int orig_pc_offset, 556 DebugInformationRecorder* debug_info, 557 Dependencies* dependencies, 558 CodeBuffer* code_buffer, int frame_size, 559 OopMapSet* oop_maps, 560 ExceptionHandlerTable* handler_table, 561 ImplicitExceptionTable* nul_chk_table, 562 AbstractCompiler* compiler, 563 int comp_level 564) 565{ 566 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 567 code_buffer->finalize_oop_references(method); 568 // create nmethod 569 nmethod* nm = NULL; 570 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 571 int nmethod_size = 572 allocation_size(code_buffer, sizeof(nmethod)) 573 + adjust_pcs_size(debug_info->pcs_size()) 574 + round_to(dependencies->size_in_bytes() , oopSize) 575 + round_to(handler_table->size_in_bytes(), oopSize) 576 + round_to(nul_chk_table->size_in_bytes(), oopSize) 577 + round_to(debug_info->data_size() , oopSize); 578 579 nm = new (nmethod_size) 580 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 581 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 582 oop_maps, 583 handler_table, 584 nul_chk_table, 585 compiler, 586 comp_level); 587 588 if (nm != NULL) { 589 // To make dependency checking during class loading fast, record 590 // the nmethod dependencies in the classes it is dependent on. 591 // This allows the dependency checking code to simply walk the 592 // class hierarchy above the loaded class, checking only nmethods 593 // which are dependent on those classes. The slow way is to 594 // check every nmethod for dependencies which makes it linear in 595 // the number of methods compiled. For applications with a lot 596 // classes the slow way is too slow. 597 for (Dependencies::DepStream deps(nm); deps.next(); ) { 598 Klass* klass = deps.context_type(); 599 if (klass == NULL) { 600 continue; // ignore things like evol_method 601 } 602 603 // record this nmethod as dependent on this klass 604 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 605 } 606 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 607 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 608 Disassembler::decode(nm); 609 } 610 } 611 } 612 // Do verification and logging outside CodeCache_lock. 613 if (nm != NULL) { 614 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 615 DEBUG_ONLY(nm->verify();) 616 nm->log_new_nmethod(); 617 } 618 return nm; 619} 620 621 622// For native wrappers 623nmethod::nmethod( 624 Method* method, 625 int nmethod_size, 626 int compile_id, 627 CodeOffsets* offsets, 628 CodeBuffer* code_buffer, 629 int frame_size, 630 ByteSize basic_lock_owner_sp_offset, 631 ByteSize basic_lock_sp_offset, 632 OopMapSet* oop_maps ) 633 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 634 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 635 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 636 _native_basic_lock_sp_offset(basic_lock_sp_offset) 637{ 638 { 639 debug_only(No_Safepoint_Verifier nsv;) 640 assert_locked_or_safepoint(CodeCache_lock); 641 642 init_defaults(); 643 _method = method; 644 _entry_bci = InvocationEntryBci; 645 // We have no exception handler or deopt handler make the 646 // values something that will never match a pc like the nmethod vtable entry 647 _exception_offset = 0; 648 _deoptimize_offset = 0; 649 _deoptimize_mh_offset = 0; 650 _orig_pc_offset = 0; 651 652 _consts_offset = data_offset(); 653 _stub_offset = data_offset(); 654 _oops_offset = data_offset(); 655 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 656 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 657 _scopes_pcs_offset = _scopes_data_offset; 658 _dependencies_offset = _scopes_pcs_offset; 659 _handler_table_offset = _dependencies_offset; 660 _nul_chk_table_offset = _handler_table_offset; 661 _nmethod_end_offset = _nul_chk_table_offset; 662 _compile_id = compile_id; 663 _comp_level = CompLevel_none; 664 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 665 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 666 _osr_entry_point = NULL; 667 _exception_cache = NULL; 668 _pc_desc_cache.reset_to(NULL); 669 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 670 671 code_buffer->copy_values_to(this); 672 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 673 CodeCache::add_scavenge_root_nmethod(this); 674 Universe::heap()->register_nmethod(this); 675 } 676 debug_only(verify_scavenge_root_oops()); 677 CodeCache::commit(this); 678 } 679 680 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 681 ttyLocker ttyl; // keep the following output all in one block 682 // This output goes directly to the tty, not the compiler log. 683 // To enable tools to match it up with the compilation activity, 684 // be sure to tag this tty output with the compile ID. 685 if (xtty != NULL) { 686 xtty->begin_head("print_native_nmethod"); 687 xtty->method(_method); 688 xtty->stamp(); 689 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 690 } 691 // print the header part first 692 print(); 693 // then print the requested information 694 if (PrintNativeNMethods) { 695 print_code(); 696 if (oop_maps != NULL) { 697 oop_maps->print(); 698 } 699 } 700 if (PrintRelocations) { 701 print_relocations(); 702 } 703 if (xtty != NULL) { 704 xtty->tail("print_native_nmethod"); 705 } 706 } 707} 708 709// For dtrace wrappers 710#ifdef HAVE_DTRACE_H 711nmethod::nmethod( 712 Method* method, 713 int nmethod_size, 714 CodeOffsets* offsets, 715 CodeBuffer* code_buffer, 716 int frame_size) 717 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 718 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 719 _native_receiver_sp_offset(in_ByteSize(-1)), 720 _native_basic_lock_sp_offset(in_ByteSize(-1)) 721{ 722 { 723 debug_only(No_Safepoint_Verifier nsv;) 724 assert_locked_or_safepoint(CodeCache_lock); 725 726 init_defaults(); 727 _method = method; 728 _entry_bci = InvocationEntryBci; 729 // We have no exception handler or deopt handler make the 730 // values something that will never match a pc like the nmethod vtable entry 731 _exception_offset = 0; 732 _deoptimize_offset = 0; 733 _deoptimize_mh_offset = 0; 734 _unwind_handler_offset = -1; 735 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 736 _orig_pc_offset = 0; 737 _consts_offset = data_offset(); 738 _stub_offset = data_offset(); 739 _oops_offset = data_offset(); 740 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 741 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 742 _scopes_pcs_offset = _scopes_data_offset; 743 _dependencies_offset = _scopes_pcs_offset; 744 _handler_table_offset = _dependencies_offset; 745 _nul_chk_table_offset = _handler_table_offset; 746 _nmethod_end_offset = _nul_chk_table_offset; 747 _compile_id = 0; // default 748 _comp_level = CompLevel_none; 749 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 750 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 751 _osr_entry_point = NULL; 752 _exception_cache = NULL; 753 _pc_desc_cache.reset_to(NULL); 754 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 755 756 code_buffer->copy_values_to(this); 757 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 758 CodeCache::add_scavenge_root_nmethod(this); 759 Universe::heap()->register_nmethod(this); 760 } 761 DEBUG_ONLY(verify_scavenge_root_oops();) 762 CodeCache::commit(this); 763 } 764 765 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 766 ttyLocker ttyl; // keep the following output all in one block 767 // This output goes directly to the tty, not the compiler log. 768 // To enable tools to match it up with the compilation activity, 769 // be sure to tag this tty output with the compile ID. 770 if (xtty != NULL) { 771 xtty->begin_head("print_dtrace_nmethod"); 772 xtty->method(_method); 773 xtty->stamp(); 774 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 775 } 776 // print the header part first 777 print(); 778 // then print the requested information 779 if (PrintNMethods) { 780 print_code(); 781 } 782 if (PrintRelocations) { 783 print_relocations(); 784 } 785 if (xtty != NULL) { 786 xtty->tail("print_dtrace_nmethod"); 787 } 788 } 789} 790#endif // def HAVE_DTRACE_H 791 792void* nmethod::operator new(size_t size, int nmethod_size) throw() { 793 // Not critical, may return null if there is too little continuous memory 794 return CodeCache::allocate(nmethod_size); 795} 796 797nmethod::nmethod( 798 Method* method, 799 int nmethod_size, 800 int compile_id, 801 int entry_bci, 802 CodeOffsets* offsets, 803 int orig_pc_offset, 804 DebugInformationRecorder* debug_info, 805 Dependencies* dependencies, 806 CodeBuffer *code_buffer, 807 int frame_size, 808 OopMapSet* oop_maps, 809 ExceptionHandlerTable* handler_table, 810 ImplicitExceptionTable* nul_chk_table, 811 AbstractCompiler* compiler, 812 int comp_level 813 ) 814 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 815 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 816 _native_receiver_sp_offset(in_ByteSize(-1)), 817 _native_basic_lock_sp_offset(in_ByteSize(-1)) 818{ 819 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 820 { 821 debug_only(No_Safepoint_Verifier nsv;) 822 assert_locked_or_safepoint(CodeCache_lock); 823 824 init_defaults(); 825 _method = method; 826 _entry_bci = entry_bci; 827 _compile_id = compile_id; 828 _comp_level = comp_level; 829 _compiler = compiler; 830 _orig_pc_offset = orig_pc_offset; 831 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 832 833 // Section offsets 834 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 835 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 836 837 // Exception handler and deopt handler are in the stub section 838 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 839 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 840 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 841 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 842 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 843 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 844 } else { 845 _deoptimize_mh_offset = -1; 846 } 847 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 848 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 849 } else { 850 _unwind_handler_offset = -1; 851 } 852 853 _oops_offset = data_offset(); 854 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 855 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 856 857 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 858 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 859 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 860 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 861 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 862 863 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 864 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 865 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 866 _exception_cache = NULL; 867 _pc_desc_cache.reset_to(scopes_pcs_begin()); 868 869 // Copy contents of ScopeDescRecorder to nmethod 870 code_buffer->copy_values_to(this); 871 debug_info->copy_to(this); 872 dependencies->copy_to(this); 873 if (ScavengeRootsInCode && detect_scavenge_root_oops()) { 874 CodeCache::add_scavenge_root_nmethod(this); 875 Universe::heap()->register_nmethod(this); 876 } 877 debug_only(verify_scavenge_root_oops()); 878 879 CodeCache::commit(this); 880 881 // Copy contents of ExceptionHandlerTable to nmethod 882 handler_table->copy_to(this); 883 nul_chk_table->copy_to(this); 884 885 // we use the information of entry points to find out if a method is 886 // static or non static 887 assert(compiler->is_c2() || 888 _method->is_static() == (entry_point() == _verified_entry_point), 889 " entry points must be same for static methods and vice versa"); 890 } 891 892 bool printnmethods = PrintNMethods 893 || CompilerOracle::should_print(_method) 894 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 895 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 896 print_nmethod(printnmethods); 897 } 898} 899 900 901// Print a short set of xml attributes to identify this nmethod. The 902// output should be embedded in some other element. 903void nmethod::log_identity(xmlStream* log) const { 904 log->print(" compile_id='%d'", compile_id()); 905 const char* nm_kind = compile_kind(); 906 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 907 if (compiler() != NULL) { 908 log->print(" compiler='%s'", compiler()->name()); 909 } 910 if (TieredCompilation) { 911 log->print(" level='%d'", comp_level()); 912 } 913} 914 915 916#define LOG_OFFSET(log, name) \ 917 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 918 log->print(" " XSTR(name) "_offset='%d'" , \ 919 (intptr_t)name##_begin() - (intptr_t)this) 920 921 922void nmethod::log_new_nmethod() const { 923 if (LogCompilation && xtty != NULL) { 924 ttyLocker ttyl; 925 HandleMark hm; 926 xtty->begin_elem("nmethod"); 927 log_identity(xtty); 928 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 929 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 930 931 LOG_OFFSET(xtty, relocation); 932 LOG_OFFSET(xtty, consts); 933 LOG_OFFSET(xtty, insts); 934 LOG_OFFSET(xtty, stub); 935 LOG_OFFSET(xtty, scopes_data); 936 LOG_OFFSET(xtty, scopes_pcs); 937 LOG_OFFSET(xtty, dependencies); 938 LOG_OFFSET(xtty, handler_table); 939 LOG_OFFSET(xtty, nul_chk_table); 940 LOG_OFFSET(xtty, oops); 941 942 xtty->method(method()); 943 xtty->stamp(); 944 xtty->end_elem(); 945 } 946} 947 948#undef LOG_OFFSET 949 950 951// Print out more verbose output usually for a newly created nmethod. 952void nmethod::print_on(outputStream* st, const char* msg) const { 953 if (st != NULL) { 954 ttyLocker ttyl; 955 if (WizardMode) { 956 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); 957 st->print_cr(" (" INTPTR_FORMAT ")", this); 958 } else { 959 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); 960 } 961 } 962} 963 964 965void nmethod::print_nmethod(bool printmethod) { 966 ttyLocker ttyl; // keep the following output all in one block 967 if (xtty != NULL) { 968 xtty->begin_head("print_nmethod"); 969 xtty->stamp(); 970 xtty->end_head(); 971 } 972 // print the header part first 973 print(); 974 // then print the requested information 975 if (printmethod) { 976 print_code(); 977 print_pcs(); 978 if (oop_maps()) { 979 oop_maps()->print(); 980 } 981 } 982 if (PrintDebugInfo) { 983 print_scopes(); 984 } 985 if (PrintRelocations) { 986 print_relocations(); 987 } 988 if (PrintDependencies) { 989 print_dependencies(); 990 } 991 if (PrintExceptionHandlers) { 992 print_handler_table(); 993 print_nul_chk_table(); 994 } 995 if (xtty != NULL) { 996 xtty->tail("print_nmethod"); 997 } 998} 999 1000 1001// Promote one word from an assembly-time handle to a live embedded oop. 1002inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1003 if (handle == NULL || 1004 // As a special case, IC oops are initialized to 1 or -1. 1005 handle == (jobject) Universe::non_oop_word()) { 1006 (*dest) = (oop) handle; 1007 } else { 1008 (*dest) = JNIHandles::resolve_non_null(handle); 1009 } 1010} 1011 1012 1013// Have to have the same name because it's called by a template 1014void nmethod::copy_values(GrowableArray<jobject>* array) { 1015 int length = array->length(); 1016 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1017 oop* dest = oops_begin(); 1018 for (int index = 0 ; index < length; index++) { 1019 initialize_immediate_oop(&dest[index], array->at(index)); 1020 } 1021 1022 // Now we can fix up all the oops in the code. We need to do this 1023 // in the code because the assembler uses jobjects as placeholders. 1024 // The code and relocations have already been initialized by the 1025 // CodeBlob constructor, so it is valid even at this early point to 1026 // iterate over relocations and patch the code. 1027 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1028} 1029 1030void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1031 int length = array->length(); 1032 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1033 Metadata** dest = metadata_begin(); 1034 for (int index = 0 ; index < length; index++) { 1035 dest[index] = array->at(index); 1036 } 1037} 1038 1039bool nmethod::is_at_poll_return(address pc) { 1040 RelocIterator iter(this, pc, pc+1); 1041 while (iter.next()) { 1042 if (iter.type() == relocInfo::poll_return_type) 1043 return true; 1044 } 1045 return false; 1046} 1047 1048 1049bool nmethod::is_at_poll_or_poll_return(address pc) { 1050 RelocIterator iter(this, pc, pc+1); 1051 while (iter.next()) { 1052 relocInfo::relocType t = iter.type(); 1053 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1054 return true; 1055 } 1056 return false; 1057} 1058 1059 1060void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1061 // re-patch all oop-bearing instructions, just in case some oops moved 1062 RelocIterator iter(this, begin, end); 1063 while (iter.next()) { 1064 if (iter.type() == relocInfo::oop_type) { 1065 oop_Relocation* reloc = iter.oop_reloc(); 1066 if (initialize_immediates && reloc->oop_is_immediate()) { 1067 oop* dest = reloc->oop_addr(); 1068 initialize_immediate_oop(dest, (jobject) *dest); 1069 } 1070 // Refresh the oop-related bits of this instruction. 1071 reloc->fix_oop_relocation(); 1072 } else if (iter.type() == relocInfo::metadata_type) { 1073 metadata_Relocation* reloc = iter.metadata_reloc(); 1074 reloc->fix_metadata_relocation(); 1075 } 1076 } 1077} 1078 1079 1080void nmethod::verify_oop_relocations() { 1081 // Ensure sure that the code matches the current oop values 1082 RelocIterator iter(this, NULL, NULL); 1083 while (iter.next()) { 1084 if (iter.type() == relocInfo::oop_type) { 1085 oop_Relocation* reloc = iter.oop_reloc(); 1086 if (!reloc->oop_is_immediate()) { 1087 reloc->verify_oop_relocation(); 1088 } 1089 } 1090 } 1091} 1092 1093 1094ScopeDesc* nmethod::scope_desc_at(address pc) { 1095 PcDesc* pd = pc_desc_at(pc); 1096 guarantee(pd != NULL, "scope must be present"); 1097 return new ScopeDesc(this, pd->scope_decode_offset(), 1098 pd->obj_decode_offset(), pd->should_reexecute(), 1099 pd->return_oop()); 1100} 1101 1102 1103void nmethod::clear_inline_caches() { 1104 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1105 if (is_zombie()) { 1106 return; 1107 } 1108 1109 RelocIterator iter(this); 1110 while (iter.next()) { 1111 iter.reloc()->clear_inline_cache(); 1112 } 1113} 1114 1115 1116void nmethod::cleanup_inline_caches() { 1117 1118 assert_locked_or_safepoint(CompiledIC_lock); 1119 1120 // If the method is not entrant or zombie then a JMP is plastered over the 1121 // first few bytes. If an oop in the old code was there, that oop 1122 // should not get GC'd. Skip the first few bytes of oops on 1123 // not-entrant methods. 1124 address low_boundary = verified_entry_point(); 1125 if (!is_in_use()) { 1126 low_boundary += NativeJump::instruction_size; 1127 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1128 // This means that the low_boundary is going to be a little too high. 1129 // This shouldn't matter, since oops of non-entrant methods are never used. 1130 // In fact, why are we bothering to look at oops in a non-entrant method?? 1131 } 1132 1133 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1134 ResourceMark rm; 1135 RelocIterator iter(this, low_boundary); 1136 while(iter.next()) { 1137 switch(iter.type()) { 1138 case relocInfo::virtual_call_type: 1139 case relocInfo::opt_virtual_call_type: { 1140 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1141 // Ok, to lookup references to zombies here 1142 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1143 if( cb != NULL && cb->is_nmethod() ) { 1144 nmethod* nm = (nmethod*)cb; 1145 // Clean inline caches pointing to both zombie and not_entrant methods 1146 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1147 } 1148 break; 1149 } 1150 case relocInfo::static_call_type: { 1151 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1152 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1153 if( cb != NULL && cb->is_nmethod() ) { 1154 nmethod* nm = (nmethod*)cb; 1155 // Clean inline caches pointing to both zombie and not_entrant methods 1156 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1157 } 1158 break; 1159 } 1160 } 1161 } 1162} 1163 1164// This is a private interface with the sweeper. 1165void nmethod::mark_as_seen_on_stack() { 1166 assert(is_alive(), "Must be an alive method"); 1167 // Set the traversal mark to ensure that the sweeper does 2 1168 // cleaning passes before moving to zombie. 1169 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1170} 1171 1172// Tell if a non-entrant method can be converted to a zombie (i.e., 1173// there are no activations on the stack, not in use by the VM, 1174// and not in use by the ServiceThread) 1175bool nmethod::can_not_entrant_be_converted() { 1176 assert(is_not_entrant(), "must be a non-entrant method"); 1177 1178 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1179 // count can be greater than the stack traversal count before it hits the 1180 // nmethod for the second time. 1181 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1182 !is_locked_by_vm(); 1183} 1184 1185void nmethod::inc_decompile_count() { 1186 if (!is_compiled_by_c2()) return; 1187 // Could be gated by ProfileTraps, but do not bother... 1188 Method* m = method(); 1189 if (m == NULL) return; 1190 MethodData* mdo = m->method_data(); 1191 if (mdo == NULL) return; 1192 // There is a benign race here. See comments in methodData.hpp. 1193 mdo->inc_decompile_count(); 1194} 1195 1196void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1197 1198 post_compiled_method_unload(); 1199 1200 // Since this nmethod is being unloaded, make sure that dependencies 1201 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1202 // indicate that this work is being done during a GC. 1203 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1204 assert(is_alive != NULL, "Should be non-NULL"); 1205 // A non-NULL is_alive closure indicates that this is being called during GC. 1206 flush_dependencies(is_alive); 1207 1208 // Break cycle between nmethod & method 1209 if (TraceClassUnloading && WizardMode) { 1210 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1211 " unloadable], Method*(" INTPTR_FORMAT 1212 "), cause(" INTPTR_FORMAT ")", 1213 this, (address)_method, (address)cause); 1214 if (!Universe::heap()->is_gc_active()) 1215 cause->klass()->print(); 1216 } 1217 // Unlink the osr method, so we do not look this up again 1218 if (is_osr_method()) { 1219 invalidate_osr_method(); 1220 } 1221 // If _method is already NULL the Method* is about to be unloaded, 1222 // so we don't have to break the cycle. Note that it is possible to 1223 // have the Method* live here, in case we unload the nmethod because 1224 // it is pointing to some oop (other than the Method*) being unloaded. 1225 if (_method != NULL) { 1226 // OSR methods point to the Method*, but the Method* does not 1227 // point back! 1228 if (_method->code() == this) { 1229 _method->clear_code(); // Break a cycle 1230 } 1231 _method = NULL; // Clear the method of this dead nmethod 1232 } 1233 // Make the class unloaded - i.e., change state and notify sweeper 1234 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1235 if (is_in_use()) { 1236 // Transitioning directly from live to unloaded -- so 1237 // we need to force a cache clean-up; remember this 1238 // for later on. 1239 CodeCache::set_needs_cache_clean(true); 1240 } 1241 _state = unloaded; 1242 1243 // Log the unloading. 1244 log_state_change(); 1245 1246 // The Method* is gone at this point 1247 assert(_method == NULL, "Tautology"); 1248 1249 set_osr_link(NULL); 1250 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1251 NMethodSweeper::report_state_change(this); 1252} 1253 1254void nmethod::invalidate_osr_method() { 1255 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1256 // Remove from list of active nmethods 1257 if (method() != NULL) 1258 method()->method_holder()->remove_osr_nmethod(this); 1259 // Set entry as invalid 1260 _entry_bci = InvalidOSREntryBci; 1261} 1262 1263void nmethod::log_state_change() const { 1264 if (LogCompilation) { 1265 if (xtty != NULL) { 1266 ttyLocker ttyl; // keep the following output all in one block 1267 if (_state == unloaded) { 1268 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1269 os::current_thread_id()); 1270 } else { 1271 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1272 os::current_thread_id(), 1273 (_state == zombie ? " zombie='1'" : "")); 1274 } 1275 log_identity(xtty); 1276 xtty->stamp(); 1277 xtty->end_elem(); 1278 } 1279 } 1280 if (PrintCompilation && _state != unloaded) { 1281 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1282 } 1283} 1284 1285/** 1286 * Common functionality for both make_not_entrant and make_zombie 1287 */ 1288bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1289 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1290 assert(!is_zombie(), "should not already be a zombie"); 1291 1292 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1293 nmethodLocker nml(this); 1294 methodHandle the_method(method()); 1295 No_Safepoint_Verifier nsv; 1296 1297 // during patching, depending on the nmethod state we must notify the GC that 1298 // code has been unloaded, unregistering it. We cannot do this right while 1299 // holding the Patching_lock because we need to use the CodeCache_lock. This 1300 // would be prone to deadlocks. 1301 // This flag is used to remember whether we need to later lock and unregister. 1302 bool nmethod_needs_unregister = false; 1303 1304 { 1305 // invalidate osr nmethod before acquiring the patching lock since 1306 // they both acquire leaf locks and we don't want a deadlock. 1307 // This logic is equivalent to the logic below for patching the 1308 // verified entry point of regular methods. 1309 if (is_osr_method()) { 1310 // this effectively makes the osr nmethod not entrant 1311 invalidate_osr_method(); 1312 } 1313 1314 // Enter critical section. Does not block for safepoint. 1315 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1316 1317 if (_state == state) { 1318 // another thread already performed this transition so nothing 1319 // to do, but return false to indicate this. 1320 return false; 1321 } 1322 1323 // The caller can be calling the method statically or through an inline 1324 // cache call. 1325 if (!is_osr_method() && !is_not_entrant()) { 1326 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1327 SharedRuntime::get_handle_wrong_method_stub()); 1328 } 1329 1330 if (is_in_use()) { 1331 // It's a true state change, so mark the method as decompiled. 1332 // Do it only for transition from alive. 1333 inc_decompile_count(); 1334 } 1335 1336 // If the state is becoming a zombie, signal to unregister the nmethod with 1337 // the heap. 1338 // This nmethod may have already been unloaded during a full GC. 1339 if ((state == zombie) && !is_unloaded()) { 1340 nmethod_needs_unregister = true; 1341 } 1342 1343 // Must happen before state change. Otherwise we have a race condition in 1344 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1345 // transition its state from 'not_entrant' to 'zombie' without having to wait 1346 // for stack scanning. 1347 if (state == not_entrant) { 1348 mark_as_seen_on_stack(); 1349 OrderAccess::storestore(); 1350 } 1351 1352 // Change state 1353 _state = state; 1354 1355 // Log the transition once 1356 log_state_change(); 1357 1358 // Remove nmethod from method. 1359 // We need to check if both the _code and _from_compiled_code_entry_point 1360 // refer to this nmethod because there is a race in setting these two fields 1361 // in Method* as seen in bugid 4947125. 1362 // If the vep() points to the zombie nmethod, the memory for the nmethod 1363 // could be flushed and the compiler and vtable stubs could still call 1364 // through it. 1365 if (method() != NULL && (method()->code() == this || 1366 method()->from_compiled_entry() == verified_entry_point())) { 1367 HandleMark hm; 1368 method()->clear_code(); 1369 } 1370 } // leave critical region under Patching_lock 1371 1372 // When the nmethod becomes zombie it is no longer alive so the 1373 // dependencies must be flushed. nmethods in the not_entrant 1374 // state will be flushed later when the transition to zombie 1375 // happens or they get unloaded. 1376 if (state == zombie) { 1377 { 1378 // Flushing dependecies must be done before any possible 1379 // safepoint can sneak in, otherwise the oops used by the 1380 // dependency logic could have become stale. 1381 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1382 if (nmethod_needs_unregister) { 1383 Universe::heap()->unregister_nmethod(this); 1384 } 1385 flush_dependencies(NULL); 1386 } 1387 1388 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1389 // event and it hasn't already been reported for this nmethod then 1390 // report it now. The event may have been reported earilier if the GC 1391 // marked it for unloading). JvmtiDeferredEventQueue support means 1392 // we no longer go to a safepoint here. 1393 post_compiled_method_unload(); 1394 1395#ifdef ASSERT 1396 // It's no longer safe to access the oops section since zombie 1397 // nmethods aren't scanned for GC. 1398 _oops_are_stale = true; 1399#endif 1400 // the Method may be reclaimed by class unloading now that the 1401 // nmethod is in zombie state 1402 set_method(NULL); 1403 } else { 1404 assert(state == not_entrant, "other cases may need to be handled differently"); 1405 } 1406 1407 if (TraceCreateZombies) { 1408 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1409 } 1410 1411 NMethodSweeper::report_state_change(this); 1412 return true; 1413} 1414 1415void nmethod::flush() { 1416 // Note that there are no valid oops in the nmethod anymore. 1417 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1418 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1419 1420 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1421 assert_locked_or_safepoint(CodeCache_lock); 1422 1423 // completely deallocate this method 1424 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1425 if (PrintMethodFlushing) { 1426 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1427 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1428 } 1429 1430 // We need to deallocate any ExceptionCache data. 1431 // Note that we do not need to grab the nmethod lock for this, it 1432 // better be thread safe if we're disposing of it! 1433 ExceptionCache* ec = exception_cache(); 1434 set_exception_cache(NULL); 1435 while(ec != NULL) { 1436 ExceptionCache* next = ec->next(); 1437 delete ec; 1438 ec = next; 1439 } 1440 1441 if (on_scavenge_root_list()) { 1442 CodeCache::drop_scavenge_root_nmethod(this); 1443 } 1444 1445#ifdef SHARK 1446 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1447#endif // SHARK 1448 1449 ((CodeBlob*)(this))->flush(); 1450 1451 CodeCache::free(this); 1452} 1453 1454 1455// 1456// Notify all classes this nmethod is dependent on that it is no 1457// longer dependent. This should only be called in two situations. 1458// First, when a nmethod transitions to a zombie all dependents need 1459// to be clear. Since zombification happens at a safepoint there's no 1460// synchronization issues. The second place is a little more tricky. 1461// During phase 1 of mark sweep class unloading may happen and as a 1462// result some nmethods may get unloaded. In this case the flushing 1463// of dependencies must happen during phase 1 since after GC any 1464// dependencies in the unloaded nmethod won't be updated, so 1465// traversing the dependency information in unsafe. In that case this 1466// function is called with a non-NULL argument and this function only 1467// notifies instanceKlasses that are reachable 1468 1469void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1470 assert_locked_or_safepoint(CodeCache_lock); 1471 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1472 "is_alive is non-NULL if and only if we are called during GC"); 1473 if (!has_flushed_dependencies()) { 1474 set_has_flushed_dependencies(); 1475 for (Dependencies::DepStream deps(this); deps.next(); ) { 1476 Klass* klass = deps.context_type(); 1477 if (klass == NULL) continue; // ignore things like evol_method 1478 1479 // During GC the is_alive closure is non-NULL, and is used to 1480 // determine liveness of dependees that need to be updated. 1481 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1482 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1483 } 1484 } 1485 } 1486} 1487 1488 1489// If this oop is not live, the nmethod can be unloaded. 1490bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1491 assert(root != NULL, "just checking"); 1492 oop obj = *root; 1493 if (obj == NULL || is_alive->do_object_b(obj)) { 1494 return false; 1495 } 1496 1497 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1498 // simply because one of its constant oops has gone dead. 1499 // No actual classes need to be unloaded in order for this to occur. 1500 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1501 make_unloaded(is_alive, obj); 1502 return true; 1503} 1504 1505// ------------------------------------------------------------------ 1506// post_compiled_method_load_event 1507// new method for install_code() path 1508// Transfer information from compilation to jvmti 1509void nmethod::post_compiled_method_load_event() { 1510 1511 Method* moop = method(); 1512 HOTSPOT_COMPILED_METHOD_LOAD( 1513 (char *) moop->klass_name()->bytes(), 1514 moop->klass_name()->utf8_length(), 1515 (char *) moop->name()->bytes(), 1516 moop->name()->utf8_length(), 1517 (char *) moop->signature()->bytes(), 1518 moop->signature()->utf8_length(), 1519 insts_begin(), insts_size()); 1520 1521 if (JvmtiExport::should_post_compiled_method_load() || 1522 JvmtiExport::should_post_compiled_method_unload()) { 1523 get_and_cache_jmethod_id(); 1524 } 1525 1526 if (JvmtiExport::should_post_compiled_method_load()) { 1527 // Let the Service thread (which is a real Java thread) post the event 1528 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1529 JvmtiDeferredEventQueue::enqueue( 1530 JvmtiDeferredEvent::compiled_method_load_event(this)); 1531 } 1532} 1533 1534jmethodID nmethod::get_and_cache_jmethod_id() { 1535 if (_jmethod_id == NULL) { 1536 // Cache the jmethod_id since it can no longer be looked up once the 1537 // method itself has been marked for unloading. 1538 _jmethod_id = method()->jmethod_id(); 1539 } 1540 return _jmethod_id; 1541} 1542 1543void nmethod::post_compiled_method_unload() { 1544 if (unload_reported()) { 1545 // During unloading we transition to unloaded and then to zombie 1546 // and the unloading is reported during the first transition. 1547 return; 1548 } 1549 1550 assert(_method != NULL && !is_unloaded(), "just checking"); 1551 DTRACE_METHOD_UNLOAD_PROBE(method()); 1552 1553 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1554 // post the event. Sometime later this nmethod will be made a zombie 1555 // by the sweeper but the Method* will not be valid at that point. 1556 // If the _jmethod_id is null then no load event was ever requested 1557 // so don't bother posting the unload. The main reason for this is 1558 // that the jmethodID is a weak reference to the Method* so if 1559 // it's being unloaded there's no way to look it up since the weak 1560 // ref will have been cleared. 1561 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1562 assert(!unload_reported(), "already unloaded"); 1563 JvmtiDeferredEvent event = 1564 JvmtiDeferredEvent::compiled_method_unload_event(this, 1565 _jmethod_id, insts_begin()); 1566 if (SafepointSynchronize::is_at_safepoint()) { 1567 // Don't want to take the queueing lock. Add it as pending and 1568 // it will get enqueued later. 1569 JvmtiDeferredEventQueue::add_pending_event(event); 1570 } else { 1571 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1572 JvmtiDeferredEventQueue::enqueue(event); 1573 } 1574 } 1575 1576 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1577 // any time. As the nmethod is being unloaded now we mark it has 1578 // having the unload event reported - this will ensure that we don't 1579 // attempt to report the event in the unlikely scenario where the 1580 // event is enabled at the time the nmethod is made a zombie. 1581 set_unload_reported(); 1582} 1583 1584// This is called at the end of the strong tracing/marking phase of a 1585// GC to unload an nmethod if it contains otherwise unreachable 1586// oops. 1587 1588void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1589 // Make sure the oop's ready to receive visitors 1590 assert(!is_zombie() && !is_unloaded(), 1591 "should not call follow on zombie or unloaded nmethod"); 1592 1593 // If the method is not entrant then a JMP is plastered over the 1594 // first few bytes. If an oop in the old code was there, that oop 1595 // should not get GC'd. Skip the first few bytes of oops on 1596 // not-entrant methods. 1597 address low_boundary = verified_entry_point(); 1598 if (is_not_entrant()) { 1599 low_boundary += NativeJump::instruction_size; 1600 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1601 // (See comment above.) 1602 } 1603 1604 // The RedefineClasses() API can cause the class unloading invariant 1605 // to no longer be true. See jvmtiExport.hpp for details. 1606 // Also, leave a debugging breadcrumb in local flag. 1607 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1608 if (a_class_was_redefined) { 1609 // This set of the unloading_occurred flag is done before the 1610 // call to post_compiled_method_unload() so that the unloading 1611 // of this nmethod is reported. 1612 unloading_occurred = true; 1613 } 1614 1615 // Exception cache 1616 ExceptionCache* ec = exception_cache(); 1617 while (ec != NULL) { 1618 Klass* ex_klass = ec->exception_type(); 1619 ExceptionCache* next_ec = ec->next(); 1620 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 1621 remove_from_exception_cache(ec); 1622 } 1623 ec = next_ec; 1624 } 1625 1626 // If class unloading occurred we first iterate over all inline caches and 1627 // clear ICs where the cached oop is referring to an unloaded klass or method. 1628 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1629 // iteration below. 1630 if (unloading_occurred) { 1631 RelocIterator iter(this, low_boundary); 1632 while(iter.next()) { 1633 if (iter.type() == relocInfo::virtual_call_type) { 1634 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1635 if (ic->is_icholder_call()) { 1636 // The only exception is compiledICHolder oops which may 1637 // yet be marked below. (We check this further below). 1638 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1639 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1640 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1641 continue; 1642 } 1643 } else { 1644 Metadata* ic_oop = ic->cached_metadata(); 1645 if (ic_oop != NULL) { 1646 if (ic_oop->is_klass()) { 1647 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1648 continue; 1649 } 1650 } else if (ic_oop->is_method()) { 1651 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1652 continue; 1653 } 1654 } else { 1655 ShouldNotReachHere(); 1656 } 1657 } 1658 } 1659 ic->set_to_clean(); 1660 } 1661 } 1662 } 1663 1664 // Compiled code 1665 { 1666 RelocIterator iter(this, low_boundary); 1667 while (iter.next()) { 1668 if (iter.type() == relocInfo::oop_type) { 1669 oop_Relocation* r = iter.oop_reloc(); 1670 // In this loop, we must only traverse those oops directly embedded in 1671 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1672 assert(1 == (r->oop_is_immediate()) + 1673 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1674 "oop must be found in exactly one place"); 1675 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1676 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1677 return; 1678 } 1679 } 1680 } 1681 } 1682 } 1683 1684 1685 // Scopes 1686 for (oop* p = oops_begin(); p < oops_end(); p++) { 1687 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1688 if (can_unload(is_alive, p, unloading_occurred)) { 1689 return; 1690 } 1691 } 1692 1693 // Ensure that all metadata is still alive 1694 verify_metadata_loaders(low_boundary, is_alive); 1695} 1696 1697#ifdef ASSERT 1698 1699class CheckClass : AllStatic { 1700 static BoolObjectClosure* _is_alive; 1701 1702 // Check class_loader is alive for this bit of metadata. 1703 static void check_class(Metadata* md) { 1704 Klass* klass = NULL; 1705 if (md->is_klass()) { 1706 klass = ((Klass*)md); 1707 } else if (md->is_method()) { 1708 klass = ((Method*)md)->method_holder(); 1709 } else if (md->is_methodData()) { 1710 klass = ((MethodData*)md)->method()->method_holder(); 1711 } else { 1712 md->print(); 1713 ShouldNotReachHere(); 1714 } 1715 assert(klass->is_loader_alive(_is_alive), "must be alive"); 1716 } 1717 public: 1718 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 1719 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 1720 _is_alive = is_alive; 1721 nm->metadata_do(check_class); 1722 } 1723}; 1724 1725// This is called during a safepoint so can use static data 1726BoolObjectClosure* CheckClass::_is_alive = NULL; 1727#endif // ASSERT 1728 1729 1730// Processing of oop references should have been sufficient to keep 1731// all strong references alive. Any weak references should have been 1732// cleared as well. Visit all the metadata and ensure that it's 1733// really alive. 1734void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 1735#ifdef ASSERT 1736 RelocIterator iter(this, low_boundary); 1737 while (iter.next()) { 1738 // static_stub_Relocations may have dangling references to 1739 // Method*s so trim them out here. Otherwise it looks like 1740 // compiled code is maintaining a link to dead metadata. 1741 address static_call_addr = NULL; 1742 if (iter.type() == relocInfo::opt_virtual_call_type) { 1743 CompiledIC* cic = CompiledIC_at(iter.reloc()); 1744 if (!cic->is_call_to_interpreted()) { 1745 static_call_addr = iter.addr(); 1746 } 1747 } else if (iter.type() == relocInfo::static_call_type) { 1748 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 1749 if (!csc->is_call_to_interpreted()) { 1750 static_call_addr = iter.addr(); 1751 } 1752 } 1753 if (static_call_addr != NULL) { 1754 RelocIterator sciter(this, low_boundary); 1755 while (sciter.next()) { 1756 if (sciter.type() == relocInfo::static_stub_type && 1757 sciter.static_stub_reloc()->static_call() == static_call_addr) { 1758 sciter.static_stub_reloc()->clear_inline_cache(); 1759 } 1760 } 1761 } 1762 } 1763 // Check that the metadata embedded in the nmethod is alive 1764 CheckClass::do_check_class(is_alive, this); 1765#endif 1766} 1767 1768 1769// Iterate over metadata calling this function. Used by RedefineClasses 1770void nmethod::metadata_do(void f(Metadata*)) { 1771 address low_boundary = verified_entry_point(); 1772 if (is_not_entrant()) { 1773 low_boundary += NativeJump::instruction_size; 1774 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1775 // (See comment above.) 1776 } 1777 { 1778 // Visit all immediate references that are embedded in the instruction stream. 1779 RelocIterator iter(this, low_boundary); 1780 while (iter.next()) { 1781 if (iter.type() == relocInfo::metadata_type ) { 1782 metadata_Relocation* r = iter.metadata_reloc(); 1783 // In this lmetadata, we must only follow those metadatas directly embedded in 1784 // the code. Other metadatas (oop_index>0) are seen as part of 1785 // the metadata section below. 1786 assert(1 == (r->metadata_is_immediate()) + 1787 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1788 "metadata must be found in exactly one place"); 1789 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1790 Metadata* md = r->metadata_value(); 1791 f(md); 1792 } 1793 } else if (iter.type() == relocInfo::virtual_call_type) { 1794 // Check compiledIC holders associated with this nmethod 1795 CompiledIC *ic = CompiledIC_at(iter.reloc()); 1796 if (ic->is_icholder_call()) { 1797 CompiledICHolder* cichk = ic->cached_icholder(); 1798 f(cichk->holder_method()); 1799 f(cichk->holder_klass()); 1800 } else { 1801 Metadata* ic_oop = ic->cached_metadata(); 1802 if (ic_oop != NULL) { 1803 f(ic_oop); 1804 } 1805 } 1806 } 1807 } 1808 } 1809 1810 // Visit the metadata section 1811 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1812 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1813 Metadata* md = *p; 1814 f(md); 1815 } 1816 1817 // Call function Method*, not embedded in these other places. 1818 if (_method != NULL) f(_method); 1819} 1820 1821void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1822 // make sure the oops ready to receive visitors 1823 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1824 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1825 1826 // If the method is not entrant or zombie then a JMP is plastered over the 1827 // first few bytes. If an oop in the old code was there, that oop 1828 // should not get GC'd. Skip the first few bytes of oops on 1829 // not-entrant methods. 1830 address low_boundary = verified_entry_point(); 1831 if (is_not_entrant()) { 1832 low_boundary += NativeJump::instruction_size; 1833 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1834 // (See comment above.) 1835 } 1836 1837 RelocIterator iter(this, low_boundary); 1838 1839 while (iter.next()) { 1840 if (iter.type() == relocInfo::oop_type ) { 1841 oop_Relocation* r = iter.oop_reloc(); 1842 // In this loop, we must only follow those oops directly embedded in 1843 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1844 assert(1 == (r->oop_is_immediate()) + 1845 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1846 "oop must be found in exactly one place"); 1847 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1848 f->do_oop(r->oop_addr()); 1849 } 1850 } 1851 } 1852 1853 // Scopes 1854 // This includes oop constants not inlined in the code stream. 1855 for (oop* p = oops_begin(); p < oops_end(); p++) { 1856 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1857 f->do_oop(p); 1858 } 1859} 1860 1861#define NMETHOD_SENTINEL ((nmethod*)badAddress) 1862 1863nmethod* volatile nmethod::_oops_do_mark_nmethods; 1864 1865// An nmethod is "marked" if its _mark_link is set non-null. 1866// Even if it is the end of the linked list, it will have a non-null link value, 1867// as long as it is on the list. 1868// This code must be MP safe, because it is used from parallel GC passes. 1869bool nmethod::test_set_oops_do_mark() { 1870 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1871 nmethod* observed_mark_link = _oops_do_mark_link; 1872 if (observed_mark_link == NULL) { 1873 // Claim this nmethod for this thread to mark. 1874 observed_mark_link = (nmethod*) 1875 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 1876 if (observed_mark_link == NULL) { 1877 1878 // Atomically append this nmethod (now claimed) to the head of the list: 1879 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1880 for (;;) { 1881 nmethod* required_mark_nmethods = observed_mark_nmethods; 1882 _oops_do_mark_link = required_mark_nmethods; 1883 observed_mark_nmethods = (nmethod*) 1884 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1885 if (observed_mark_nmethods == required_mark_nmethods) 1886 break; 1887 } 1888 // Mark was clear when we first saw this guy. 1889 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 1890 return false; 1891 } 1892 } 1893 // On fall through, another racing thread marked this nmethod before we did. 1894 return true; 1895} 1896 1897void nmethod::oops_do_marking_prologue() { 1898 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 1899 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1900 // We use cmpxchg_ptr instead of regular assignment here because the user 1901 // may fork a bunch of threads, and we need them all to see the same state. 1902 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 1903 guarantee(observed == NULL, "no races in this sequential code"); 1904} 1905 1906void nmethod::oops_do_marking_epilogue() { 1907 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1908 nmethod* cur = _oops_do_mark_nmethods; 1909 while (cur != NMETHOD_SENTINEL) { 1910 assert(cur != NULL, "not NULL-terminated"); 1911 nmethod* next = cur->_oops_do_mark_link; 1912 cur->_oops_do_mark_link = NULL; 1913 cur->fix_oop_relocations(); 1914 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 1915 cur = next; 1916 } 1917 void* required = _oops_do_mark_nmethods; 1918 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 1919 guarantee(observed == required, "no races in this sequential code"); 1920 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 1921} 1922 1923class DetectScavengeRoot: public OopClosure { 1924 bool _detected_scavenge_root; 1925public: 1926 DetectScavengeRoot() : _detected_scavenge_root(false) 1927 { NOT_PRODUCT(_print_nm = NULL); } 1928 bool detected_scavenge_root() { return _detected_scavenge_root; } 1929 virtual void do_oop(oop* p) { 1930 if ((*p) != NULL && (*p)->is_scavengable()) { 1931 NOT_PRODUCT(maybe_print(p)); 1932 _detected_scavenge_root = true; 1933 } 1934 } 1935 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1936 1937#ifndef PRODUCT 1938 nmethod* _print_nm; 1939 void maybe_print(oop* p) { 1940 if (_print_nm == NULL) return; 1941 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 1942 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 1943 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 1944 (void *)(*p), (intptr_t)p); 1945 (*p)->print(); 1946 } 1947#endif //PRODUCT 1948}; 1949 1950bool nmethod::detect_scavenge_root_oops() { 1951 DetectScavengeRoot detect_scavenge_root; 1952 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 1953 oops_do(&detect_scavenge_root); 1954 return detect_scavenge_root.detected_scavenge_root(); 1955} 1956 1957// Method that knows how to preserve outgoing arguments at call. This method must be 1958// called with a frame corresponding to a Java invoke 1959void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 1960#ifndef SHARK 1961 if (!method()->is_native()) { 1962 SimpleScopeDesc ssd(this, fr.pc()); 1963 Bytecode_invoke call(ssd.method(), ssd.bci()); 1964 bool has_receiver = call.has_receiver(); 1965 bool has_appendix = call.has_appendix(); 1966 Symbol* signature = call.signature(); 1967 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 1968 } 1969#endif // !SHARK 1970} 1971 1972 1973oop nmethod::embeddedOop_at(u_char* p) { 1974 RelocIterator iter(this, p, p + 1); 1975 while (iter.next()) 1976 if (iter.type() == relocInfo::oop_type) { 1977 return iter.oop_reloc()->oop_value(); 1978 } 1979 return NULL; 1980} 1981 1982 1983inline bool includes(void* p, void* from, void* to) { 1984 return from <= p && p < to; 1985} 1986 1987 1988void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1989 assert(count >= 2, "must be sentinel values, at least"); 1990 1991#ifdef ASSERT 1992 // must be sorted and unique; we do a binary search in find_pc_desc() 1993 int prev_offset = pcs[0].pc_offset(); 1994 assert(prev_offset == PcDesc::lower_offset_limit, 1995 "must start with a sentinel"); 1996 for (int i = 1; i < count; i++) { 1997 int this_offset = pcs[i].pc_offset(); 1998 assert(this_offset > prev_offset, "offsets must be sorted"); 1999 prev_offset = this_offset; 2000 } 2001 assert(prev_offset == PcDesc::upper_offset_limit, 2002 "must end with a sentinel"); 2003#endif //ASSERT 2004 2005 // Search for MethodHandle invokes and tag the nmethod. 2006 for (int i = 0; i < count; i++) { 2007 if (pcs[i].is_method_handle_invoke()) { 2008 set_has_method_handle_invokes(true); 2009 break; 2010 } 2011 } 2012 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2013 2014 int size = count * sizeof(PcDesc); 2015 assert(scopes_pcs_size() >= size, "oob"); 2016 memcpy(scopes_pcs_begin(), pcs, size); 2017 2018 // Adjust the final sentinel downward. 2019 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2020 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2021 last_pc->set_pc_offset(content_size() + 1); 2022 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2023 // Fill any rounding gaps with copies of the last record. 2024 last_pc[1] = last_pc[0]; 2025 } 2026 // The following assert could fail if sizeof(PcDesc) is not 2027 // an integral multiple of oopSize (the rounding term). 2028 // If it fails, change the logic to always allocate a multiple 2029 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2030 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2031} 2032 2033void nmethod::copy_scopes_data(u_char* buffer, int size) { 2034 assert(scopes_data_size() >= size, "oob"); 2035 memcpy(scopes_data_begin(), buffer, size); 2036} 2037 2038 2039#ifdef ASSERT 2040static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2041 PcDesc* lower = nm->scopes_pcs_begin(); 2042 PcDesc* upper = nm->scopes_pcs_end(); 2043 lower += 1; // exclude initial sentinel 2044 PcDesc* res = NULL; 2045 for (PcDesc* p = lower; p < upper; p++) { 2046 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2047 if (match_desc(p, pc_offset, approximate)) { 2048 if (res == NULL) 2049 res = p; 2050 else 2051 res = (PcDesc*) badAddress; 2052 } 2053 } 2054 return res; 2055} 2056#endif 2057 2058 2059// Finds a PcDesc with real-pc equal to "pc" 2060PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2061 address base_address = code_begin(); 2062 if ((pc < base_address) || 2063 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2064 return NULL; // PC is wildly out of range 2065 } 2066 int pc_offset = (int) (pc - base_address); 2067 2068 // Check the PcDesc cache if it contains the desired PcDesc 2069 // (This as an almost 100% hit rate.) 2070 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2071 if (res != NULL) { 2072 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2073 return res; 2074 } 2075 2076 // Fallback algorithm: quasi-linear search for the PcDesc 2077 // Find the last pc_offset less than the given offset. 2078 // The successor must be the required match, if there is a match at all. 2079 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2080 PcDesc* lower = scopes_pcs_begin(); 2081 PcDesc* upper = scopes_pcs_end(); 2082 upper -= 1; // exclude final sentinel 2083 if (lower >= upper) return NULL; // native method; no PcDescs at all 2084 2085#define assert_LU_OK \ 2086 /* invariant on lower..upper during the following search: */ \ 2087 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2088 assert(upper->pc_offset() >= pc_offset, "sanity") 2089 assert_LU_OK; 2090 2091 // Use the last successful return as a split point. 2092 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2093 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2094 if (mid->pc_offset() < pc_offset) { 2095 lower = mid; 2096 } else { 2097 upper = mid; 2098 } 2099 2100 // Take giant steps at first (4096, then 256, then 16, then 1) 2101 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2102 const int RADIX = (1 << LOG2_RADIX); 2103 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2104 while ((mid = lower + step) < upper) { 2105 assert_LU_OK; 2106 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2107 if (mid->pc_offset() < pc_offset) { 2108 lower = mid; 2109 } else { 2110 upper = mid; 2111 break; 2112 } 2113 } 2114 assert_LU_OK; 2115 } 2116 2117 // Sneak up on the value with a linear search of length ~16. 2118 while (true) { 2119 assert_LU_OK; 2120 mid = lower + 1; 2121 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2122 if (mid->pc_offset() < pc_offset) { 2123 lower = mid; 2124 } else { 2125 upper = mid; 2126 break; 2127 } 2128 } 2129#undef assert_LU_OK 2130 2131 if (match_desc(upper, pc_offset, approximate)) { 2132 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2133 _pc_desc_cache.add_pc_desc(upper); 2134 return upper; 2135 } else { 2136 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2137 return NULL; 2138 } 2139} 2140 2141 2142void nmethod::check_all_dependencies(DepChange& changes) { 2143 // Checked dependencies are allocated into this ResourceMark 2144 ResourceMark rm; 2145 2146 // Turn off dependency tracing while actually testing dependencies. 2147 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2148 2149 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2150 &DependencySignature::equals, 11027> DepTable; 2151 2152 DepTable* table = new DepTable(); 2153 2154 // Iterate over live nmethods and check dependencies of all nmethods that are not 2155 // marked for deoptimization. A particular dependency is only checked once. 2156 for(nmethod* nm = CodeCache::alive_nmethod(CodeCache::first()); nm != NULL; nm = CodeCache::alive_nmethod(CodeCache::next(nm))) { 2157 if (!nm->is_marked_for_deoptimization()) { 2158 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2159 // Construct abstraction of a dependency. 2160 DependencySignature* current_sig = new DependencySignature(deps); 2161 2162 // Determine if dependency is already checked. table->put(...) returns 2163 // 'true' if the dependency is added (i.e., was not in the hashtable). 2164 if (table->put(*current_sig, 1)) { 2165 if (deps.check_dependency() != NULL) { 2166 // Dependency checking failed. Print out information about the failed 2167 // dependency and finally fail with an assert. We can fail here, since 2168 // dependency checking is never done in a product build. 2169 changes.print(); 2170 nm->print(); 2171 nm->print_dependencies(); 2172 assert(false, "Should have been marked for deoptimization"); 2173 } 2174 } 2175 } 2176 } 2177 } 2178} 2179 2180bool nmethod::check_dependency_on(DepChange& changes) { 2181 // What has happened: 2182 // 1) a new class dependee has been added 2183 // 2) dependee and all its super classes have been marked 2184 bool found_check = false; // set true if we are upset 2185 for (Dependencies::DepStream deps(this); deps.next(); ) { 2186 // Evaluate only relevant dependencies. 2187 if (deps.spot_check_dependency_at(changes) != NULL) { 2188 found_check = true; 2189 NOT_DEBUG(break); 2190 } 2191 } 2192 return found_check; 2193} 2194 2195bool nmethod::is_evol_dependent_on(Klass* dependee) { 2196 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2197 Array<Method*>* dependee_methods = dependee_ik->methods(); 2198 for (Dependencies::DepStream deps(this); deps.next(); ) { 2199 if (deps.type() == Dependencies::evol_method) { 2200 Method* method = deps.method_argument(0); 2201 for (int j = 0; j < dependee_methods->length(); j++) { 2202 if (dependee_methods->at(j) == method) { 2203 // RC_TRACE macro has an embedded ResourceMark 2204 RC_TRACE(0x01000000, 2205 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2206 _method->method_holder()->external_name(), 2207 _method->name()->as_C_string(), 2208 _method->signature()->as_C_string(), compile_id(), 2209 method->method_holder()->external_name(), 2210 method->name()->as_C_string(), 2211 method->signature()->as_C_string())); 2212 if (TraceDependencies || LogCompilation) 2213 deps.log_dependency(dependee); 2214 return true; 2215 } 2216 } 2217 } 2218 } 2219 return false; 2220} 2221 2222// Called from mark_for_deoptimization, when dependee is invalidated. 2223bool nmethod::is_dependent_on_method(Method* dependee) { 2224 for (Dependencies::DepStream deps(this); deps.next(); ) { 2225 if (deps.type() != Dependencies::evol_method) 2226 continue; 2227 Method* method = deps.method_argument(0); 2228 if (method == dependee) return true; 2229 } 2230 return false; 2231} 2232 2233 2234bool nmethod::is_patchable_at(address instr_addr) { 2235 assert(insts_contains(instr_addr), "wrong nmethod used"); 2236 if (is_zombie()) { 2237 // a zombie may never be patched 2238 return false; 2239 } 2240 return true; 2241} 2242 2243 2244address nmethod::continuation_for_implicit_exception(address pc) { 2245 // Exception happened outside inline-cache check code => we are inside 2246 // an active nmethod => use cpc to determine a return address 2247 int exception_offset = pc - code_begin(); 2248 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2249#ifdef ASSERT 2250 if (cont_offset == 0) { 2251 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2252 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2253 HandleMark hm(thread); 2254 ResourceMark rm(thread); 2255 CodeBlob* cb = CodeCache::find_blob(pc); 2256 assert(cb != NULL && cb == this, ""); 2257 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2258 print(); 2259 method()->print_codes(); 2260 print_code(); 2261 print_pcs(); 2262 } 2263#endif 2264 if (cont_offset == 0) { 2265 // Let the normal error handling report the exception 2266 return NULL; 2267 } 2268 return code_begin() + cont_offset; 2269} 2270 2271 2272 2273void nmethod_init() { 2274 // make sure you didn't forget to adjust the filler fields 2275 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2276} 2277 2278 2279//------------------------------------------------------------------------------------------- 2280 2281 2282// QQQ might we make this work from a frame?? 2283nmethodLocker::nmethodLocker(address pc) { 2284 CodeBlob* cb = CodeCache::find_blob(pc); 2285 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2286 _nm = (nmethod*)cb; 2287 lock_nmethod(_nm); 2288} 2289 2290// Only JvmtiDeferredEvent::compiled_method_unload_event() 2291// should pass zombie_ok == true. 2292void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2293 if (nm == NULL) return; 2294 Atomic::inc(&nm->_lock_count); 2295 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2296} 2297 2298void nmethodLocker::unlock_nmethod(nmethod* nm) { 2299 if (nm == NULL) return; 2300 Atomic::dec(&nm->_lock_count); 2301 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2302} 2303 2304 2305// ----------------------------------------------------------------------------- 2306// nmethod::get_deopt_original_pc 2307// 2308// Return the original PC for the given PC if: 2309// (a) the given PC belongs to a nmethod and 2310// (b) it is a deopt PC 2311address nmethod::get_deopt_original_pc(const frame* fr) { 2312 if (fr->cb() == NULL) return NULL; 2313 2314 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2315 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2316 return nm->get_original_pc(fr); 2317 2318 return NULL; 2319} 2320 2321 2322// ----------------------------------------------------------------------------- 2323// MethodHandle 2324 2325bool nmethod::is_method_handle_return(address return_pc) { 2326 if (!has_method_handle_invokes()) return false; 2327 PcDesc* pd = pc_desc_at(return_pc); 2328 if (pd == NULL) 2329 return false; 2330 return pd->is_method_handle_invoke(); 2331} 2332 2333 2334// ----------------------------------------------------------------------------- 2335// Verification 2336 2337class VerifyOopsClosure: public OopClosure { 2338 nmethod* _nm; 2339 bool _ok; 2340public: 2341 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2342 bool ok() { return _ok; } 2343 virtual void do_oop(oop* p) { 2344 if ((*p) == NULL || (*p)->is_oop()) return; 2345 if (_ok) { 2346 _nm->print_nmethod(true); 2347 _ok = false; 2348 } 2349 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2350 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2351 } 2352 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2353}; 2354 2355void nmethod::verify() { 2356 2357 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2358 // seems odd. 2359 2360 if( is_zombie() || is_not_entrant() ) 2361 return; 2362 2363 // Make sure all the entry points are correctly aligned for patching. 2364 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2365 2366 // assert(method()->is_oop(), "must be valid"); 2367 2368 ResourceMark rm; 2369 2370 if (!CodeCache::contains(this)) { 2371 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2372 } 2373 2374 if(is_native_method() ) 2375 return; 2376 2377 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2378 if (nm != this) { 2379 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2380 this)); 2381 } 2382 2383 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2384 if (! p->verify(this)) { 2385 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2386 } 2387 } 2388 2389 VerifyOopsClosure voc(this); 2390 oops_do(&voc); 2391 assert(voc.ok(), "embedded oops must be OK"); 2392 verify_scavenge_root_oops(); 2393 2394 verify_scopes(); 2395} 2396 2397 2398void nmethod::verify_interrupt_point(address call_site) { 2399 // Verify IC only when nmethod installation is finished. 2400 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2401 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2402 if (is_installed) { 2403 Thread *cur = Thread::current(); 2404 if (CompiledIC_lock->owner() == cur || 2405 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2406 SafepointSynchronize::is_at_safepoint())) { 2407 CompiledIC_at(this, call_site); 2408 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2409 } else { 2410 MutexLocker ml_verify (CompiledIC_lock); 2411 CompiledIC_at(this, call_site); 2412 } 2413 } 2414 2415 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2416 assert(pd != NULL, "PcDesc must exist"); 2417 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2418 pd->obj_decode_offset(), pd->should_reexecute(), 2419 pd->return_oop()); 2420 !sd->is_top(); sd = sd->sender()) { 2421 sd->verify(); 2422 } 2423} 2424 2425void nmethod::verify_scopes() { 2426 if( !method() ) return; // Runtime stubs have no scope 2427 if (method()->is_native()) return; // Ignore stub methods. 2428 // iterate through all interrupt point 2429 // and verify the debug information is valid. 2430 RelocIterator iter((nmethod*)this); 2431 while (iter.next()) { 2432 address stub = NULL; 2433 switch (iter.type()) { 2434 case relocInfo::virtual_call_type: 2435 verify_interrupt_point(iter.addr()); 2436 break; 2437 case relocInfo::opt_virtual_call_type: 2438 stub = iter.opt_virtual_call_reloc()->static_stub(); 2439 verify_interrupt_point(iter.addr()); 2440 break; 2441 case relocInfo::static_call_type: 2442 stub = iter.static_call_reloc()->static_stub(); 2443 //verify_interrupt_point(iter.addr()); 2444 break; 2445 case relocInfo::runtime_call_type: 2446 address destination = iter.reloc()->value(); 2447 // Right now there is no way to find out which entries support 2448 // an interrupt point. It would be nice if we had this 2449 // information in a table. 2450 break; 2451 } 2452 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2453 } 2454} 2455 2456 2457// ----------------------------------------------------------------------------- 2458// Non-product code 2459#ifndef PRODUCT 2460 2461class DebugScavengeRoot: public OopClosure { 2462 nmethod* _nm; 2463 bool _ok; 2464public: 2465 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2466 bool ok() { return _ok; } 2467 virtual void do_oop(oop* p) { 2468 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2469 if (_ok) { 2470 _nm->print_nmethod(true); 2471 _ok = false; 2472 } 2473 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2474 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2475 (*p)->print(); 2476 } 2477 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2478}; 2479 2480void nmethod::verify_scavenge_root_oops() { 2481 if (!on_scavenge_root_list()) { 2482 // Actually look inside, to verify the claim that it's clean. 2483 DebugScavengeRoot debug_scavenge_root(this); 2484 oops_do(&debug_scavenge_root); 2485 if (!debug_scavenge_root.ok()) 2486 fatal("found an unadvertised bad scavengable oop in the code cache"); 2487 } 2488 assert(scavenge_root_not_marked(), ""); 2489} 2490 2491#endif // PRODUCT 2492 2493// Printing operations 2494 2495void nmethod::print() const { 2496 ResourceMark rm; 2497 ttyLocker ttyl; // keep the following output all in one block 2498 2499 tty->print("Compiled method "); 2500 2501 if (is_compiled_by_c1()) { 2502 tty->print("(c1) "); 2503 } else if (is_compiled_by_c2()) { 2504 tty->print("(c2) "); 2505 } else if (is_compiled_by_shark()) { 2506 tty->print("(shark) "); 2507 } else { 2508 tty->print("(nm) "); 2509 } 2510 2511 print_on(tty, NULL); 2512 2513 if (WizardMode) { 2514 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2515 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2516 tty->print(" { "); 2517 if (is_in_use()) tty->print("in_use "); 2518 if (is_not_entrant()) tty->print("not_entrant "); 2519 if (is_zombie()) tty->print("zombie "); 2520 if (is_unloaded()) tty->print("unloaded "); 2521 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2522 tty->print_cr("}:"); 2523 } 2524 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2525 (address)this, 2526 (address)this + size(), 2527 size()); 2528 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2529 relocation_begin(), 2530 relocation_end(), 2531 relocation_size()); 2532 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2533 consts_begin(), 2534 consts_end(), 2535 consts_size()); 2536 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2537 insts_begin(), 2538 insts_end(), 2539 insts_size()); 2540 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2541 stub_begin(), 2542 stub_end(), 2543 stub_size()); 2544 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2545 oops_begin(), 2546 oops_end(), 2547 oops_size()); 2548 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2549 metadata_begin(), 2550 metadata_end(), 2551 metadata_size()); 2552 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2553 scopes_data_begin(), 2554 scopes_data_end(), 2555 scopes_data_size()); 2556 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2557 scopes_pcs_begin(), 2558 scopes_pcs_end(), 2559 scopes_pcs_size()); 2560 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2561 dependencies_begin(), 2562 dependencies_end(), 2563 dependencies_size()); 2564 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2565 handler_table_begin(), 2566 handler_table_end(), 2567 handler_table_size()); 2568 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2569 nul_chk_table_begin(), 2570 nul_chk_table_end(), 2571 nul_chk_table_size()); 2572} 2573 2574void nmethod::print_code() { 2575 HandleMark hm; 2576 ResourceMark m; 2577 Disassembler::decode(this); 2578} 2579 2580 2581#ifndef PRODUCT 2582 2583void nmethod::print_scopes() { 2584 // Find the first pc desc for all scopes in the code and print it. 2585 ResourceMark rm; 2586 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2587 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2588 continue; 2589 2590 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2591 sd->print_on(tty, p); 2592 } 2593} 2594 2595void nmethod::print_dependencies() { 2596 ResourceMark rm; 2597 ttyLocker ttyl; // keep the following output all in one block 2598 tty->print_cr("Dependencies:"); 2599 for (Dependencies::DepStream deps(this); deps.next(); ) { 2600 deps.print_dependency(); 2601 Klass* ctxk = deps.context_type(); 2602 if (ctxk != NULL) { 2603 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2604 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2605 } 2606 } 2607 deps.log_dependency(); // put it into the xml log also 2608 } 2609} 2610 2611 2612void nmethod::print_relocations() { 2613 ResourceMark m; // in case methods get printed via the debugger 2614 tty->print_cr("relocations:"); 2615 RelocIterator iter(this); 2616 iter.print(); 2617 if (UseRelocIndex) { 2618 jint* index_end = (jint*)relocation_end() - 1; 2619 jint index_size = *index_end; 2620 jint* index_start = (jint*)( (address)index_end - index_size ); 2621 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2622 if (index_size > 0) { 2623 jint* ip; 2624 for (ip = index_start; ip+2 <= index_end; ip += 2) 2625 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2626 ip[0], 2627 ip[1], 2628 header_end()+ip[0], 2629 relocation_begin()-1+ip[1]); 2630 for (; ip < index_end; ip++) 2631 tty->print_cr(" (%d ?)", ip[0]); 2632 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2633 ip++; 2634 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2635 } 2636 } 2637} 2638 2639 2640void nmethod::print_pcs() { 2641 ResourceMark m; // in case methods get printed via debugger 2642 tty->print_cr("pc-bytecode offsets:"); 2643 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2644 p->print(this); 2645 } 2646} 2647 2648#endif // PRODUCT 2649 2650const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2651 RelocIterator iter(this, begin, end); 2652 bool have_one = false; 2653 while (iter.next()) { 2654 have_one = true; 2655 switch (iter.type()) { 2656 case relocInfo::none: return "no_reloc"; 2657 case relocInfo::oop_type: { 2658 stringStream st; 2659 oop_Relocation* r = iter.oop_reloc(); 2660 oop obj = r->oop_value(); 2661 st.print("oop("); 2662 if (obj == NULL) st.print("NULL"); 2663 else obj->print_value_on(&st); 2664 st.print(")"); 2665 return st.as_string(); 2666 } 2667 case relocInfo::metadata_type: { 2668 stringStream st; 2669 metadata_Relocation* r = iter.metadata_reloc(); 2670 Metadata* obj = r->metadata_value(); 2671 st.print("metadata("); 2672 if (obj == NULL) st.print("NULL"); 2673 else obj->print_value_on(&st); 2674 st.print(")"); 2675 return st.as_string(); 2676 } 2677 case relocInfo::virtual_call_type: return "virtual_call"; 2678 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2679 case relocInfo::static_call_type: return "static_call"; 2680 case relocInfo::static_stub_type: return "static_stub"; 2681 case relocInfo::runtime_call_type: return "runtime_call"; 2682 case relocInfo::external_word_type: return "external_word"; 2683 case relocInfo::internal_word_type: return "internal_word"; 2684 case relocInfo::section_word_type: return "section_word"; 2685 case relocInfo::poll_type: return "poll"; 2686 case relocInfo::poll_return_type: return "poll_return"; 2687 case relocInfo::type_mask: return "type_bit_mask"; 2688 } 2689 } 2690 return have_one ? "other" : NULL; 2691} 2692 2693// Return a the last scope in (begin..end] 2694ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2695 PcDesc* p = pc_desc_near(begin+1); 2696 if (p != NULL && p->real_pc(this) <= end) { 2697 return new ScopeDesc(this, p->scope_decode_offset(), 2698 p->obj_decode_offset(), p->should_reexecute(), 2699 p->return_oop()); 2700 } 2701 return NULL; 2702} 2703 2704void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2705 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2706 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2707 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2708 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2709 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2710 2711 if (has_method_handle_invokes()) 2712 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2713 2714 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2715 2716 if (block_begin == entry_point()) { 2717 methodHandle m = method(); 2718 if (m.not_null()) { 2719 stream->print(" # "); 2720 m->print_value_on(stream); 2721 stream->cr(); 2722 } 2723 if (m.not_null() && !is_osr_method()) { 2724 ResourceMark rm; 2725 int sizeargs = m->size_of_parameters(); 2726 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2727 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2728 { 2729 int sig_index = 0; 2730 if (!m->is_static()) 2731 sig_bt[sig_index++] = T_OBJECT; // 'this' 2732 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2733 BasicType t = ss.type(); 2734 sig_bt[sig_index++] = t; 2735 if (type2size[t] == 2) { 2736 sig_bt[sig_index++] = T_VOID; 2737 } else { 2738 assert(type2size[t] == 1, "size is 1 or 2"); 2739 } 2740 } 2741 assert(sig_index == sizeargs, ""); 2742 } 2743 const char* spname = "sp"; // make arch-specific? 2744 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2745 int stack_slot_offset = this->frame_size() * wordSize; 2746 int tab1 = 14, tab2 = 24; 2747 int sig_index = 0; 2748 int arg_index = (m->is_static() ? 0 : -1); 2749 bool did_old_sp = false; 2750 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2751 bool at_this = (arg_index == -1); 2752 bool at_old_sp = false; 2753 BasicType t = (at_this ? T_OBJECT : ss.type()); 2754 assert(t == sig_bt[sig_index], "sigs in sync"); 2755 if (at_this) 2756 stream->print(" # this: "); 2757 else 2758 stream->print(" # parm%d: ", arg_index); 2759 stream->move_to(tab1); 2760 VMReg fst = regs[sig_index].first(); 2761 VMReg snd = regs[sig_index].second(); 2762 if (fst->is_reg()) { 2763 stream->print("%s", fst->name()); 2764 if (snd->is_valid()) { 2765 stream->print(":%s", snd->name()); 2766 } 2767 } else if (fst->is_stack()) { 2768 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2769 if (offset == stack_slot_offset) at_old_sp = true; 2770 stream->print("[%s+0x%x]", spname, offset); 2771 } else { 2772 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2773 } 2774 stream->print(" "); 2775 stream->move_to(tab2); 2776 stream->print("= "); 2777 if (at_this) { 2778 m->method_holder()->print_value_on(stream); 2779 } else { 2780 bool did_name = false; 2781 if (!at_this && ss.is_object()) { 2782 Symbol* name = ss.as_symbol_or_null(); 2783 if (name != NULL) { 2784 name->print_value_on(stream); 2785 did_name = true; 2786 } 2787 } 2788 if (!did_name) 2789 stream->print("%s", type2name(t)); 2790 } 2791 if (at_old_sp) { 2792 stream->print(" (%s of caller)", spname); 2793 did_old_sp = true; 2794 } 2795 stream->cr(); 2796 sig_index += type2size[t]; 2797 arg_index += 1; 2798 if (!at_this) ss.next(); 2799 } 2800 if (!did_old_sp) { 2801 stream->print(" # "); 2802 stream->move_to(tab1); 2803 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2804 stream->print(" (%s of caller)", spname); 2805 stream->cr(); 2806 } 2807 } 2808 } 2809} 2810 2811void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2812 // First, find an oopmap in (begin, end]. 2813 // We use the odd half-closed interval so that oop maps and scope descs 2814 // which are tied to the byte after a call are printed with the call itself. 2815 address base = code_begin(); 2816 OopMapSet* oms = oop_maps(); 2817 if (oms != NULL) { 2818 for (int i = 0, imax = oms->size(); i < imax; i++) { 2819 OopMap* om = oms->at(i); 2820 address pc = base + om->offset(); 2821 if (pc > begin) { 2822 if (pc <= end) { 2823 st->move_to(column); 2824 st->print("; "); 2825 om->print_on(st); 2826 } 2827 break; 2828 } 2829 } 2830 } 2831 2832 // Print any debug info present at this pc. 2833 ScopeDesc* sd = scope_desc_in(begin, end); 2834 if (sd != NULL) { 2835 st->move_to(column); 2836 if (sd->bci() == SynchronizationEntryBCI) { 2837 st->print(";*synchronization entry"); 2838 } else { 2839 if (sd->method() == NULL) { 2840 st->print("method is NULL"); 2841 } else if (sd->method()->is_native()) { 2842 st->print("method is native"); 2843 } else { 2844 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2845 st->print(";*%s", Bytecodes::name(bc)); 2846 switch (bc) { 2847 case Bytecodes::_invokevirtual: 2848 case Bytecodes::_invokespecial: 2849 case Bytecodes::_invokestatic: 2850 case Bytecodes::_invokeinterface: 2851 { 2852 Bytecode_invoke invoke(sd->method(), sd->bci()); 2853 st->print(" "); 2854 if (invoke.name() != NULL) 2855 invoke.name()->print_symbol_on(st); 2856 else 2857 st->print("<UNKNOWN>"); 2858 break; 2859 } 2860 case Bytecodes::_getfield: 2861 case Bytecodes::_putfield: 2862 case Bytecodes::_getstatic: 2863 case Bytecodes::_putstatic: 2864 { 2865 Bytecode_field field(sd->method(), sd->bci()); 2866 st->print(" "); 2867 if (field.name() != NULL) 2868 field.name()->print_symbol_on(st); 2869 else 2870 st->print("<UNKNOWN>"); 2871 } 2872 } 2873 } 2874 } 2875 2876 // Print all scopes 2877 for (;sd != NULL; sd = sd->sender()) { 2878 st->move_to(column); 2879 st->print("; -"); 2880 if (sd->method() == NULL) { 2881 st->print("method is NULL"); 2882 } else { 2883 sd->method()->print_short_name(st); 2884 } 2885 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2886 if (lineno != -1) { 2887 st->print("@%d (line %d)", sd->bci(), lineno); 2888 } else { 2889 st->print("@%d", sd->bci()); 2890 } 2891 st->cr(); 2892 } 2893 } 2894 2895 // Print relocation information 2896 const char* str = reloc_string_for(begin, end); 2897 if (str != NULL) { 2898 if (sd != NULL) st->cr(); 2899 st->move_to(column); 2900 st->print("; {%s}", str); 2901 } 2902 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2903 if (cont_offset != 0) { 2904 st->move_to(column); 2905 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 2906 } 2907 2908} 2909 2910#ifndef PRODUCT 2911 2912void nmethod::print_value_on(outputStream* st) const { 2913 st->print("nmethod"); 2914 print_on(st, NULL); 2915} 2916 2917void nmethod::print_calls(outputStream* st) { 2918 RelocIterator iter(this); 2919 while (iter.next()) { 2920 switch (iter.type()) { 2921 case relocInfo::virtual_call_type: 2922 case relocInfo::opt_virtual_call_type: { 2923 VerifyMutexLocker mc(CompiledIC_lock); 2924 CompiledIC_at(iter.reloc())->print(); 2925 break; 2926 } 2927 case relocInfo::static_call_type: 2928 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 2929 compiledStaticCall_at(iter.reloc())->print(); 2930 break; 2931 } 2932 } 2933} 2934 2935void nmethod::print_handler_table() { 2936 ExceptionHandlerTable(this).print(); 2937} 2938 2939void nmethod::print_nul_chk_table() { 2940 ImplicitExceptionTable(this).print(code_begin()); 2941} 2942 2943void nmethod::print_statistics() { 2944 ttyLocker ttyl; 2945 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2946 nmethod_stats.print_native_nmethod_stats(); 2947 nmethod_stats.print_nmethod_stats(); 2948 DebugInformationRecorder::print_statistics(); 2949 nmethod_stats.print_pc_stats(); 2950 Dependencies::print_statistics(); 2951 if (xtty != NULL) xtty->tail("statistics"); 2952} 2953 2954#endif // PRODUCT 2955