nmethod.cpp revision 9801:80f8be586fae
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "code/codeCache.hpp" 27#include "code/compiledIC.hpp" 28#include "code/dependencies.hpp" 29#include "code/nativeInst.hpp" 30#include "code/nmethod.hpp" 31#include "code/scopeDesc.hpp" 32#include "compiler/abstractCompiler.hpp" 33#include "compiler/compileBroker.hpp" 34#include "compiler/compileLog.hpp" 35#include "compiler/compilerDirectives.hpp" 36#include "compiler/disassembler.hpp" 37#include "interpreter/bytecode.hpp" 38#include "oops/methodData.hpp" 39#include "oops/oop.inline.hpp" 40#include "prims/jvmtiRedefineClassesTrace.hpp" 41#include "prims/jvmtiImpl.hpp" 42#include "runtime/atomic.inline.hpp" 43#include "runtime/orderAccess.inline.hpp" 44#include "runtime/sharedRuntime.hpp" 45#include "runtime/sweeper.hpp" 46#include "utilities/resourceHash.hpp" 47#include "utilities/dtrace.hpp" 48#include "utilities/events.hpp" 49#include "utilities/xmlstream.hpp" 50#ifdef TARGET_ARCH_x86 51# include "nativeInst_x86.hpp" 52#endif 53#ifdef TARGET_ARCH_sparc 54# include "nativeInst_sparc.hpp" 55#endif 56#ifdef TARGET_ARCH_zero 57# include "nativeInst_zero.hpp" 58#endif 59#ifdef TARGET_ARCH_arm 60# include "nativeInst_arm.hpp" 61#endif 62#ifdef TARGET_ARCH_ppc 63# include "nativeInst_ppc.hpp" 64#endif 65#ifdef SHARK 66#include "shark/sharkCompiler.hpp" 67#endif 68#if INCLUDE_JVMCI 69#include "jvmci/jvmciJavaClasses.hpp" 70#endif 71 72unsigned char nmethod::_global_unloading_clock = 0; 73 74#ifdef DTRACE_ENABLED 75 76// Only bother with this argument setup if dtrace is available 77 78#define DTRACE_METHOD_UNLOAD_PROBE(method) \ 79 { \ 80 Method* m = (method); \ 81 if (m != NULL) { \ 82 Symbol* klass_name = m->klass_name(); \ 83 Symbol* name = m->name(); \ 84 Symbol* signature = m->signature(); \ 85 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 86 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 87 (char *) name->bytes(), name->utf8_length(), \ 88 (char *) signature->bytes(), signature->utf8_length()); \ 89 } \ 90 } 91 92#else // ndef DTRACE_ENABLED 93 94#define DTRACE_METHOD_UNLOAD_PROBE(method) 95 96#endif 97 98bool nmethod::is_compiled_by_c1() const { 99 if (compiler() == NULL) { 100 return false; 101 } 102 return compiler()->is_c1(); 103} 104bool nmethod::is_compiled_by_jvmci() const { 105 if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing 106 if (is_native_method()) return false; 107 return compiler()->is_jvmci(); 108} 109bool nmethod::is_compiled_by_c2() const { 110 if (compiler() == NULL) { 111 return false; 112 } 113 return compiler()->is_c2(); 114} 115bool nmethod::is_compiled_by_shark() const { 116 if (compiler() == NULL) { 117 return false; 118 } 119 return compiler()->is_shark(); 120} 121 122 123 124//--------------------------------------------------------------------------------- 125// NMethod statistics 126// They are printed under various flags, including: 127// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 128// (In the latter two cases, they like other stats are printed to the log only.) 129 130#ifndef PRODUCT 131// These variables are put into one block to reduce relocations 132// and make it simpler to print from the debugger. 133struct java_nmethod_stats_struct { 134 int nmethod_count; 135 int total_size; 136 int relocation_size; 137 int consts_size; 138 int insts_size; 139 int stub_size; 140 int scopes_data_size; 141 int scopes_pcs_size; 142 int dependencies_size; 143 int handler_table_size; 144 int nul_chk_table_size; 145 int oops_size; 146 int metadata_size; 147 148 void note_nmethod(nmethod* nm) { 149 nmethod_count += 1; 150 total_size += nm->size(); 151 relocation_size += nm->relocation_size(); 152 consts_size += nm->consts_size(); 153 insts_size += nm->insts_size(); 154 stub_size += nm->stub_size(); 155 oops_size += nm->oops_size(); 156 metadata_size += nm->metadata_size(); 157 scopes_data_size += nm->scopes_data_size(); 158 scopes_pcs_size += nm->scopes_pcs_size(); 159 dependencies_size += nm->dependencies_size(); 160 handler_table_size += nm->handler_table_size(); 161 nul_chk_table_size += nm->nul_chk_table_size(); 162 } 163 void print_nmethod_stats(const char* name) { 164 if (nmethod_count == 0) return; 165 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 166 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 167 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 168 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 169 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 170 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 171 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 172 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 173 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 174 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 175 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 176 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 177 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 178 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 179 } 180}; 181 182struct native_nmethod_stats_struct { 183 int native_nmethod_count; 184 int native_total_size; 185 int native_relocation_size; 186 int native_insts_size; 187 int native_oops_size; 188 int native_metadata_size; 189 void note_native_nmethod(nmethod* nm) { 190 native_nmethod_count += 1; 191 native_total_size += nm->size(); 192 native_relocation_size += nm->relocation_size(); 193 native_insts_size += nm->insts_size(); 194 native_oops_size += nm->oops_size(); 195 native_metadata_size += nm->metadata_size(); 196 } 197 void print_native_nmethod_stats() { 198 if (native_nmethod_count == 0) return; 199 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 200 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 201 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 202 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 203 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 204 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 205 } 206}; 207 208struct pc_nmethod_stats_struct { 209 int pc_desc_resets; // number of resets (= number of caches) 210 int pc_desc_queries; // queries to nmethod::find_pc_desc 211 int pc_desc_approx; // number of those which have approximate true 212 int pc_desc_repeats; // number of _pc_descs[0] hits 213 int pc_desc_hits; // number of LRU cache hits 214 int pc_desc_tests; // total number of PcDesc examinations 215 int pc_desc_searches; // total number of quasi-binary search steps 216 int pc_desc_adds; // number of LUR cache insertions 217 218 void print_pc_stats() { 219 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 220 pc_desc_queries, 221 (double)(pc_desc_tests + pc_desc_searches) 222 / pc_desc_queries); 223 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 224 pc_desc_resets, 225 pc_desc_queries, pc_desc_approx, 226 pc_desc_repeats, pc_desc_hits, 227 pc_desc_tests, pc_desc_searches, pc_desc_adds); 228 } 229}; 230 231#ifdef COMPILER1 232static java_nmethod_stats_struct c1_java_nmethod_stats; 233#endif 234#ifdef COMPILER2 235static java_nmethod_stats_struct c2_java_nmethod_stats; 236#endif 237#if INCLUDE_JVMCI 238static java_nmethod_stats_struct jvmci_java_nmethod_stats; 239#endif 240#ifdef SHARK 241static java_nmethod_stats_struct shark_java_nmethod_stats; 242#endif 243static java_nmethod_stats_struct unknown_java_nmethod_stats; 244 245static native_nmethod_stats_struct native_nmethod_stats; 246static pc_nmethod_stats_struct pc_nmethod_stats; 247 248static void note_java_nmethod(nmethod* nm) { 249#ifdef COMPILER1 250 if (nm->is_compiled_by_c1()) { 251 c1_java_nmethod_stats.note_nmethod(nm); 252 } else 253#endif 254#ifdef COMPILER2 255 if (nm->is_compiled_by_c2()) { 256 c2_java_nmethod_stats.note_nmethod(nm); 257 } else 258#endif 259#if INCLUDE_JVMCI 260 if (nm->is_compiled_by_jvmci()) { 261 jvmci_java_nmethod_stats.note_nmethod(nm); 262 } else 263#endif 264#ifdef SHARK 265 if (nm->is_compiled_by_shark()) { 266 shark_java_nmethod_stats.note_nmethod(nm); 267 } else 268#endif 269 { 270 unknown_java_nmethod_stats.note_nmethod(nm); 271 } 272} 273#endif // !PRODUCT 274 275//--------------------------------------------------------------------------------- 276 277 278ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 279 assert(pc != NULL, "Must be non null"); 280 assert(exception.not_null(), "Must be non null"); 281 assert(handler != NULL, "Must be non null"); 282 283 _count = 0; 284 _exception_type = exception->klass(); 285 _next = NULL; 286 287 add_address_and_handler(pc,handler); 288} 289 290 291address ExceptionCache::match(Handle exception, address pc) { 292 assert(pc != NULL,"Must be non null"); 293 assert(exception.not_null(),"Must be non null"); 294 if (exception->klass() == exception_type()) { 295 return (test_address(pc)); 296 } 297 298 return NULL; 299} 300 301 302bool ExceptionCache::match_exception_with_space(Handle exception) { 303 assert(exception.not_null(),"Must be non null"); 304 if (exception->klass() == exception_type() && count() < cache_size) { 305 return true; 306 } 307 return false; 308} 309 310 311address ExceptionCache::test_address(address addr) { 312 for (int i=0; i<count(); i++) { 313 if (pc_at(i) == addr) { 314 return handler_at(i); 315 } 316 } 317 return NULL; 318} 319 320 321bool ExceptionCache::add_address_and_handler(address addr, address handler) { 322 if (test_address(addr) == handler) return true; 323 if (count() < cache_size) { 324 set_pc_at(count(),addr); 325 set_handler_at(count(), handler); 326 increment_count(); 327 return true; 328 } 329 return false; 330} 331 332 333// private method for handling exception cache 334// These methods are private, and used to manipulate the exception cache 335// directly. 336ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 337 ExceptionCache* ec = exception_cache(); 338 while (ec != NULL) { 339 if (ec->match_exception_with_space(exception)) { 340 return ec; 341 } 342 ec = ec->next(); 343 } 344 return NULL; 345} 346 347 348//----------------------------------------------------------------------------- 349 350 351// Helper used by both find_pc_desc methods. 352static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 353 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 354 if (!approximate) 355 return pc->pc_offset() == pc_offset; 356 else 357 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 358} 359 360void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 361 if (initial_pc_desc == NULL) { 362 _pc_descs[0] = NULL; // native method; no PcDescs at all 363 return; 364 } 365 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 366 // reset the cache by filling it with benign (non-null) values 367 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 368 for (int i = 0; i < cache_size; i++) 369 _pc_descs[i] = initial_pc_desc; 370} 371 372PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 373 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 374 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 375 376 // Note: one might think that caching the most recently 377 // read value separately would be a win, but one would be 378 // wrong. When many threads are updating it, the cache 379 // line it's in would bounce between caches, negating 380 // any benefit. 381 382 // In order to prevent race conditions do not load cache elements 383 // repeatedly, but use a local copy: 384 PcDesc* res; 385 386 // Step one: Check the most recently added value. 387 res = _pc_descs[0]; 388 if (res == NULL) return NULL; // native method; no PcDescs at all 389 if (match_desc(res, pc_offset, approximate)) { 390 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 391 return res; 392 } 393 394 // Step two: Check the rest of the LRU cache. 395 for (int i = 1; i < cache_size; ++i) { 396 res = _pc_descs[i]; 397 if (res->pc_offset() < 0) break; // optimization: skip empty cache 398 if (match_desc(res, pc_offset, approximate)) { 399 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 400 return res; 401 } 402 } 403 404 // Report failure. 405 return NULL; 406} 407 408void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 409 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 410 // Update the LRU cache by shifting pc_desc forward. 411 for (int i = 0; i < cache_size; i++) { 412 PcDesc* next = _pc_descs[i]; 413 _pc_descs[i] = pc_desc; 414 pc_desc = next; 415 } 416} 417 418// adjust pcs_size so that it is a multiple of both oopSize and 419// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 420// of oopSize, then 2*sizeof(PcDesc) is) 421static int adjust_pcs_size(int pcs_size) { 422 int nsize = round_to(pcs_size, oopSize); 423 if ((nsize % sizeof(PcDesc)) != 0) { 424 nsize = pcs_size + sizeof(PcDesc); 425 } 426 assert((nsize % oopSize) == 0, "correct alignment"); 427 return nsize; 428} 429 430//----------------------------------------------------------------------------- 431 432 433void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 434 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 435 assert(new_entry != NULL,"Must be non null"); 436 assert(new_entry->next() == NULL, "Must be null"); 437 438 if (exception_cache() != NULL) { 439 new_entry->set_next(exception_cache()); 440 } 441 set_exception_cache(new_entry); 442} 443 444void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 445 ExceptionCache* prev = NULL; 446 ExceptionCache* curr = exception_cache(); 447 448 while (curr != NULL) { 449 ExceptionCache* next = curr->next(); 450 451 Klass* ex_klass = curr->exception_type(); 452 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 453 if (prev == NULL) { 454 set_exception_cache(next); 455 } else { 456 prev->set_next(next); 457 } 458 delete curr; 459 // prev stays the same. 460 } else { 461 prev = curr; 462 } 463 464 curr = next; 465 } 466} 467 468// public method for accessing the exception cache 469// These are the public access methods. 470address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 471 // We never grab a lock to read the exception cache, so we may 472 // have false negatives. This is okay, as it can only happen during 473 // the first few exception lookups for a given nmethod. 474 ExceptionCache* ec = exception_cache(); 475 while (ec != NULL) { 476 address ret_val; 477 if ((ret_val = ec->match(exception,pc)) != NULL) { 478 return ret_val; 479 } 480 ec = ec->next(); 481 } 482 return NULL; 483} 484 485 486void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 487 // There are potential race conditions during exception cache updates, so we 488 // must own the ExceptionCache_lock before doing ANY modifications. Because 489 // we don't lock during reads, it is possible to have several threads attempt 490 // to update the cache with the same data. We need to check for already inserted 491 // copies of the current data before adding it. 492 493 MutexLocker ml(ExceptionCache_lock); 494 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 495 496 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 497 target_entry = new ExceptionCache(exception,pc,handler); 498 add_exception_cache_entry(target_entry); 499 } 500} 501 502 503//-------------end of code for ExceptionCache-------------- 504 505 506int nmethod::total_size() const { 507 return 508 consts_size() + 509 insts_size() + 510 stub_size() + 511 scopes_data_size() + 512 scopes_pcs_size() + 513 handler_table_size() + 514 nul_chk_table_size(); 515} 516 517const char* nmethod::compile_kind() const { 518 if (is_osr_method()) return "osr"; 519 if (method() != NULL && is_native_method()) return "c2n"; 520 return NULL; 521} 522 523// Fill in default values for various flag fields 524void nmethod::init_defaults() { 525 _state = in_use; 526 _unloading_clock = 0; 527 _marked_for_reclamation = 0; 528 _has_flushed_dependencies = 0; 529 _has_unsafe_access = 0; 530 _has_method_handle_invokes = 0; 531 _lazy_critical_native = 0; 532 _has_wide_vectors = 0; 533 _marked_for_deoptimization = 0; 534 _lock_count = 0; 535 _stack_traversal_mark = 0; 536 _unload_reported = false; // jvmti state 537 538#ifdef ASSERT 539 _oops_are_stale = false; 540#endif 541 542 _oops_do_mark_link = NULL; 543 _jmethod_id = NULL; 544 _osr_link = NULL; 545 if (UseG1GC) { 546 _unloading_next = NULL; 547 } else { 548 _scavenge_root_link = NULL; 549 } 550 _scavenge_root_state = 0; 551 _compiler = NULL; 552#if INCLUDE_RTM_OPT 553 _rtm_state = NoRTM; 554#endif 555#if INCLUDE_JVMCI 556 _jvmci_installed_code = NULL; 557 _speculation_log = NULL; 558#endif 559} 560 561nmethod* nmethod::new_native_nmethod(const methodHandle& method, 562 int compile_id, 563 CodeBuffer *code_buffer, 564 int vep_offset, 565 int frame_complete, 566 int frame_size, 567 ByteSize basic_lock_owner_sp_offset, 568 ByteSize basic_lock_sp_offset, 569 OopMapSet* oop_maps) { 570 code_buffer->finalize_oop_references(method); 571 // create nmethod 572 nmethod* nm = NULL; 573 { 574 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 575 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 576 CodeOffsets offsets; 577 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 578 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 579 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), native_nmethod_size, 580 compile_id, &offsets, 581 code_buffer, frame_size, 582 basic_lock_owner_sp_offset, 583 basic_lock_sp_offset, oop_maps); 584 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 585 } 586 // verify nmethod 587 debug_only(if (nm) nm->verify();) // might block 588 589 if (nm != NULL) { 590 nm->log_new_nmethod(); 591 } 592 593 return nm; 594} 595 596nmethod* nmethod::new_nmethod(const methodHandle& method, 597 int compile_id, 598 int entry_bci, 599 CodeOffsets* offsets, 600 int orig_pc_offset, 601 DebugInformationRecorder* debug_info, 602 Dependencies* dependencies, 603 CodeBuffer* code_buffer, int frame_size, 604 OopMapSet* oop_maps, 605 ExceptionHandlerTable* handler_table, 606 ImplicitExceptionTable* nul_chk_table, 607 AbstractCompiler* compiler, 608 int comp_level 609#if INCLUDE_JVMCI 610 , Handle installed_code, 611 Handle speculationLog 612#endif 613) 614{ 615 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 616 code_buffer->finalize_oop_references(method); 617 // create nmethod 618 nmethod* nm = NULL; 619 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 620 int nmethod_size = 621 allocation_size(code_buffer, sizeof(nmethod)) 622 + adjust_pcs_size(debug_info->pcs_size()) 623 + round_to(dependencies->size_in_bytes() , oopSize) 624 + round_to(handler_table->size_in_bytes(), oopSize) 625 + round_to(nul_chk_table->size_in_bytes(), oopSize) 626 + round_to(debug_info->data_size() , oopSize); 627 628 nm = new (nmethod_size, comp_level) 629 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 630 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 631 oop_maps, 632 handler_table, 633 nul_chk_table, 634 compiler, 635 comp_level 636#if INCLUDE_JVMCI 637 , installed_code, 638 speculationLog 639#endif 640 ); 641 642 if (nm != NULL) { 643 // To make dependency checking during class loading fast, record 644 // the nmethod dependencies in the classes it is dependent on. 645 // This allows the dependency checking code to simply walk the 646 // class hierarchy above the loaded class, checking only nmethods 647 // which are dependent on those classes. The slow way is to 648 // check every nmethod for dependencies which makes it linear in 649 // the number of methods compiled. For applications with a lot 650 // classes the slow way is too slow. 651 for (Dependencies::DepStream deps(nm); deps.next(); ) { 652 if (deps.type() == Dependencies::call_site_target_value) { 653 // CallSite dependencies are managed on per-CallSite instance basis. 654 oop call_site = deps.argument_oop(0); 655 MethodHandles::add_dependent_nmethod(call_site, nm); 656 } else { 657 Klass* klass = deps.context_type(); 658 if (klass == NULL) { 659 continue; // ignore things like evol_method 660 } 661 // record this nmethod as dependent on this klass 662 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 663 } 664 } 665 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 666 } 667 } 668 // Do verification and logging outside CodeCache_lock. 669 if (nm != NULL) { 670 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 671 DEBUG_ONLY(nm->verify();) 672 nm->log_new_nmethod(); 673 } 674 return nm; 675} 676 677// For native wrappers 678nmethod::nmethod( 679 Method* method, 680 int nmethod_size, 681 int compile_id, 682 CodeOffsets* offsets, 683 CodeBuffer* code_buffer, 684 int frame_size, 685 ByteSize basic_lock_owner_sp_offset, 686 ByteSize basic_lock_sp_offset, 687 OopMapSet* oop_maps ) 688 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 689 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 690 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 691 _native_basic_lock_sp_offset(basic_lock_sp_offset) 692{ 693 { 694 debug_only(No_Safepoint_Verifier nsv;) 695 assert_locked_or_safepoint(CodeCache_lock); 696 697 init_defaults(); 698 _method = method; 699 _entry_bci = InvocationEntryBci; 700 // We have no exception handler or deopt handler make the 701 // values something that will never match a pc like the nmethod vtable entry 702 _exception_offset = 0; 703 _deoptimize_offset = 0; 704 _deoptimize_mh_offset = 0; 705 _orig_pc_offset = 0; 706 707 _consts_offset = data_offset(); 708 _stub_offset = data_offset(); 709 _oops_offset = data_offset(); 710 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 711 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 712 _scopes_pcs_offset = _scopes_data_offset; 713 _dependencies_offset = _scopes_pcs_offset; 714 _handler_table_offset = _dependencies_offset; 715 _nul_chk_table_offset = _handler_table_offset; 716 _nmethod_end_offset = _nul_chk_table_offset; 717 _compile_id = compile_id; 718 _comp_level = CompLevel_none; 719 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 720 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 721 _osr_entry_point = NULL; 722 _exception_cache = NULL; 723 _pc_desc_cache.reset_to(NULL); 724 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 725 726 code_buffer->copy_values_to(this); 727 if (ScavengeRootsInCode) { 728 if (detect_scavenge_root_oops()) { 729 CodeCache::add_scavenge_root_nmethod(this); 730 } 731 Universe::heap()->register_nmethod(this); 732 } 733 debug_only(verify_scavenge_root_oops()); 734 CodeCache::commit(this); 735 } 736 737 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 738 ttyLocker ttyl; // keep the following output all in one block 739 // This output goes directly to the tty, not the compiler log. 740 // To enable tools to match it up with the compilation activity, 741 // be sure to tag this tty output with the compile ID. 742 if (xtty != NULL) { 743 xtty->begin_head("print_native_nmethod"); 744 xtty->method(_method); 745 xtty->stamp(); 746 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 747 } 748 // print the header part first 749 print(); 750 // then print the requested information 751 if (PrintNativeNMethods) { 752 print_code(); 753 if (oop_maps != NULL) { 754 oop_maps->print(); 755 } 756 } 757 if (PrintRelocations) { 758 print_relocations(); 759 } 760 if (xtty != NULL) { 761 xtty->tail("print_native_nmethod"); 762 } 763 } 764} 765 766void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 767 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 768} 769 770nmethod::nmethod( 771 Method* method, 772 int nmethod_size, 773 int compile_id, 774 int entry_bci, 775 CodeOffsets* offsets, 776 int orig_pc_offset, 777 DebugInformationRecorder* debug_info, 778 Dependencies* dependencies, 779 CodeBuffer *code_buffer, 780 int frame_size, 781 OopMapSet* oop_maps, 782 ExceptionHandlerTable* handler_table, 783 ImplicitExceptionTable* nul_chk_table, 784 AbstractCompiler* compiler, 785 int comp_level 786#if INCLUDE_JVMCI 787 , Handle installed_code, 788 Handle speculation_log 789#endif 790 ) 791 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 792 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 793 _native_receiver_sp_offset(in_ByteSize(-1)), 794 _native_basic_lock_sp_offset(in_ByteSize(-1)) 795{ 796 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 797 { 798 debug_only(No_Safepoint_Verifier nsv;) 799 assert_locked_or_safepoint(CodeCache_lock); 800 801 init_defaults(); 802 _method = method; 803 _entry_bci = entry_bci; 804 _compile_id = compile_id; 805 _comp_level = comp_level; 806 _compiler = compiler; 807 _orig_pc_offset = orig_pc_offset; 808 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 809 810 // Section offsets 811 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 812 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 813 814#if INCLUDE_JVMCI 815 _jvmci_installed_code = installed_code(); 816 _speculation_log = (instanceOop)speculation_log(); 817 818 if (compiler->is_jvmci()) { 819 // JVMCI might not produce any stub sections 820 if (offsets->value(CodeOffsets::Exceptions) != -1) { 821 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 822 } else { 823 _exception_offset = -1; 824 } 825 if (offsets->value(CodeOffsets::Deopt) != -1) { 826 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 827 } else { 828 _deoptimize_offset = -1; 829 } 830 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 831 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 832 } else { 833 _deoptimize_mh_offset = -1; 834 } 835 } else { 836#endif 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"); 840 841 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 842 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 843 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 844 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 845 } else { 846 _deoptimize_mh_offset = -1; 847#if INCLUDE_JVMCI 848 } 849#endif 850 } 851 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 852 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 853 } else { 854 _unwind_handler_offset = -1; 855 } 856 857 _oops_offset = data_offset(); 858 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 859 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 860 861 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 862 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 863 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 864 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 865 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 866 867 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 868 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 869 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 870 _exception_cache = NULL; 871 _pc_desc_cache.reset_to(scopes_pcs_begin()); 872 873 // Copy contents of ScopeDescRecorder to nmethod 874 code_buffer->copy_values_to(this); 875 debug_info->copy_to(this); 876 dependencies->copy_to(this); 877 if (ScavengeRootsInCode) { 878 if (detect_scavenge_root_oops()) { 879 CodeCache::add_scavenge_root_nmethod(this); 880 } 881 Universe::heap()->register_nmethod(this); 882 } 883 debug_only(verify_scavenge_root_oops()); 884 885 CodeCache::commit(this); 886 887 // Copy contents of ExceptionHandlerTable to nmethod 888 handler_table->copy_to(this); 889 nul_chk_table->copy_to(this); 890 891 // we use the information of entry points to find out if a method is 892 // static or non static 893 assert(compiler->is_c2() || compiler->is_jvmci() || 894 _method->is_static() == (entry_point() == _verified_entry_point), 895 " entry points must be same for static methods and vice versa"); 896 } 897} 898 899// Print a short set of xml attributes to identify this nmethod. The 900// output should be embedded in some other element. 901void nmethod::log_identity(xmlStream* log) const { 902 log->print(" compile_id='%d'", compile_id()); 903 const char* nm_kind = compile_kind(); 904 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 905 if (compiler() != NULL) { 906 log->print(" compiler='%s'", compiler()->name()); 907 } 908 if (TieredCompilation) { 909 log->print(" level='%d'", comp_level()); 910 } 911} 912 913 914#define LOG_OFFSET(log, name) \ 915 if (p2i(name##_end()) - p2i(name##_begin())) \ 916 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 917 p2i(name##_begin()) - p2i(this)) 918 919 920void nmethod::log_new_nmethod() const { 921 if (LogCompilation && xtty != NULL) { 922 ttyLocker ttyl; 923 HandleMark hm; 924 xtty->begin_elem("nmethod"); 925 log_identity(xtty); 926 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 927 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 928 929 LOG_OFFSET(xtty, relocation); 930 LOG_OFFSET(xtty, consts); 931 LOG_OFFSET(xtty, insts); 932 LOG_OFFSET(xtty, stub); 933 LOG_OFFSET(xtty, scopes_data); 934 LOG_OFFSET(xtty, scopes_pcs); 935 LOG_OFFSET(xtty, dependencies); 936 LOG_OFFSET(xtty, handler_table); 937 LOG_OFFSET(xtty, nul_chk_table); 938 LOG_OFFSET(xtty, oops); 939 LOG_OFFSET(xtty, metadata); 940 941 xtty->method(method()); 942 xtty->stamp(); 943 xtty->end_elem(); 944 } 945} 946 947#undef LOG_OFFSET 948 949 950// Print out more verbose output usually for a newly created nmethod. 951void nmethod::print_on(outputStream* st, const char* msg) const { 952 if (st != NULL) { 953 ttyLocker ttyl; 954 if (WizardMode) { 955 CompileTask::print(st, this, msg, /*short_form:*/ true); 956 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 957 } else { 958 CompileTask::print(st, this, msg, /*short_form:*/ false); 959 } 960 } 961} 962 963 964void nmethod::print_nmethod(bool printmethod) { 965 ttyLocker ttyl; // keep the following output all in one block 966 if (xtty != NULL) { 967 xtty->begin_head("print_nmethod"); 968 xtty->stamp(); 969 xtty->end_head(); 970 } 971 // print the header part first 972 print(); 973 // then print the requested information 974 if (printmethod) { 975 print_code(); 976 print_pcs(); 977 if (oop_maps()) { 978 oop_maps()->print(); 979 } 980 } 981 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 982 print_scopes(); 983 } 984 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 985 print_relocations(); 986 } 987 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 988 print_dependencies(); 989 } 990 if (printmethod || PrintExceptionHandlers) { 991 print_handler_table(); 992 print_nul_chk_table(); 993 } 994 if (printmethod) { 995 print_recorded_oops(); 996 print_recorded_metadata(); 997 } 998 if (xtty != NULL) { 999 xtty->tail("print_nmethod"); 1000 } 1001} 1002 1003 1004// Promote one word from an assembly-time handle to a live embedded oop. 1005inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1006 if (handle == NULL || 1007 // As a special case, IC oops are initialized to 1 or -1. 1008 handle == (jobject) Universe::non_oop_word()) { 1009 (*dest) = (oop) handle; 1010 } else { 1011 (*dest) = JNIHandles::resolve_non_null(handle); 1012 } 1013} 1014 1015 1016// Have to have the same name because it's called by a template 1017void nmethod::copy_values(GrowableArray<jobject>* array) { 1018 int length = array->length(); 1019 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1020 oop* dest = oops_begin(); 1021 for (int index = 0 ; index < length; index++) { 1022 initialize_immediate_oop(&dest[index], array->at(index)); 1023 } 1024 1025 // Now we can fix up all the oops in the code. We need to do this 1026 // in the code because the assembler uses jobjects as placeholders. 1027 // The code and relocations have already been initialized by the 1028 // CodeBlob constructor, so it is valid even at this early point to 1029 // iterate over relocations and patch the code. 1030 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1031} 1032 1033void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1034 int length = array->length(); 1035 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1036 Metadata** dest = metadata_begin(); 1037 for (int index = 0 ; index < length; index++) { 1038 dest[index] = array->at(index); 1039 } 1040} 1041 1042bool nmethod::is_at_poll_return(address pc) { 1043 RelocIterator iter(this, pc, pc+1); 1044 while (iter.next()) { 1045 if (iter.type() == relocInfo::poll_return_type) 1046 return true; 1047 } 1048 return false; 1049} 1050 1051 1052bool nmethod::is_at_poll_or_poll_return(address pc) { 1053 RelocIterator iter(this, pc, pc+1); 1054 while (iter.next()) { 1055 relocInfo::relocType t = iter.type(); 1056 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1057 return true; 1058 } 1059 return false; 1060} 1061 1062 1063void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1064 // re-patch all oop-bearing instructions, just in case some oops moved 1065 RelocIterator iter(this, begin, end); 1066 while (iter.next()) { 1067 if (iter.type() == relocInfo::oop_type) { 1068 oop_Relocation* reloc = iter.oop_reloc(); 1069 if (initialize_immediates && reloc->oop_is_immediate()) { 1070 oop* dest = reloc->oop_addr(); 1071 initialize_immediate_oop(dest, (jobject) *dest); 1072 } 1073 // Refresh the oop-related bits of this instruction. 1074 reloc->fix_oop_relocation(); 1075 } else if (iter.type() == relocInfo::metadata_type) { 1076 metadata_Relocation* reloc = iter.metadata_reloc(); 1077 reloc->fix_metadata_relocation(); 1078 } 1079 } 1080} 1081 1082 1083void nmethod::verify_oop_relocations() { 1084 // Ensure sure that the code matches the current oop values 1085 RelocIterator iter(this, NULL, NULL); 1086 while (iter.next()) { 1087 if (iter.type() == relocInfo::oop_type) { 1088 oop_Relocation* reloc = iter.oop_reloc(); 1089 if (!reloc->oop_is_immediate()) { 1090 reloc->verify_oop_relocation(); 1091 } 1092 } 1093 } 1094} 1095 1096 1097ScopeDesc* nmethod::scope_desc_at(address pc) { 1098 PcDesc* pd = pc_desc_at(pc); 1099 guarantee(pd != NULL, "scope must be present"); 1100 return new ScopeDesc(this, pd->scope_decode_offset(), 1101 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 1102 pd->return_oop()); 1103} 1104 1105 1106void nmethod::clear_inline_caches() { 1107 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1108 if (is_zombie()) { 1109 return; 1110 } 1111 1112 RelocIterator iter(this); 1113 while (iter.next()) { 1114 iter.reloc()->clear_inline_cache(); 1115 } 1116} 1117 1118// Clear ICStubs of all compiled ICs 1119void nmethod::clear_ic_stubs() { 1120 assert_locked_or_safepoint(CompiledIC_lock); 1121 RelocIterator iter(this); 1122 while(iter.next()) { 1123 if (iter.type() == relocInfo::virtual_call_type) { 1124 CompiledIC* ic = CompiledIC_at(&iter); 1125 ic->clear_ic_stub(); 1126 } 1127 } 1128} 1129 1130 1131void nmethod::cleanup_inline_caches() { 1132 assert_locked_or_safepoint(CompiledIC_lock); 1133 1134 // If the method is not entrant or zombie then a JMP is plastered over the 1135 // first few bytes. If an oop in the old code was there, that oop 1136 // should not get GC'd. Skip the first few bytes of oops on 1137 // not-entrant methods. 1138 address low_boundary = verified_entry_point(); 1139 if (!is_in_use()) { 1140 low_boundary += NativeJump::instruction_size; 1141 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1142 // This means that the low_boundary is going to be a little too high. 1143 // This shouldn't matter, since oops of non-entrant methods are never used. 1144 // In fact, why are we bothering to look at oops in a non-entrant method?? 1145 } 1146 1147 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1148 // zombie and unloaded nmethods. 1149 ResourceMark rm; 1150 RelocIterator iter(this, low_boundary); 1151 while(iter.next()) { 1152 switch(iter.type()) { 1153 case relocInfo::virtual_call_type: 1154 case relocInfo::opt_virtual_call_type: { 1155 CompiledIC *ic = CompiledIC_at(&iter); 1156 // Ok, to lookup references to zombies here 1157 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1158 if( cb != NULL && cb->is_nmethod() ) { 1159 nmethod* nm = (nmethod*)cb; 1160 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1161 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1162 } 1163 break; 1164 } 1165 case relocInfo::static_call_type: { 1166 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1167 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1168 if( cb != NULL && cb->is_nmethod() ) { 1169 nmethod* nm = (nmethod*)cb; 1170 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1171 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1172 } 1173 break; 1174 } 1175 } 1176 } 1177} 1178 1179void nmethod::verify_clean_inline_caches() { 1180 assert_locked_or_safepoint(CompiledIC_lock); 1181 1182 // If the method is not entrant or zombie then a JMP is plastered over the 1183 // first few bytes. If an oop in the old code was there, that oop 1184 // should not get GC'd. Skip the first few bytes of oops on 1185 // not-entrant methods. 1186 address low_boundary = verified_entry_point(); 1187 if (!is_in_use()) { 1188 low_boundary += NativeJump::instruction_size; 1189 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1190 // This means that the low_boundary is going to be a little too high. 1191 // This shouldn't matter, since oops of non-entrant methods are never used. 1192 // In fact, why are we bothering to look at oops in a non-entrant method?? 1193 } 1194 1195 ResourceMark rm; 1196 RelocIterator iter(this, low_boundary); 1197 while(iter.next()) { 1198 switch(iter.type()) { 1199 case relocInfo::virtual_call_type: 1200 case relocInfo::opt_virtual_call_type: { 1201 CompiledIC *ic = CompiledIC_at(&iter); 1202 // Ok, to lookup references to zombies here 1203 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1204 if( cb != NULL && cb->is_nmethod() ) { 1205 nmethod* nm = (nmethod*)cb; 1206 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1207 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1208 assert(ic->is_clean(), "IC should be clean"); 1209 } 1210 } 1211 break; 1212 } 1213 case relocInfo::static_call_type: { 1214 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1215 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1216 if( cb != NULL && cb->is_nmethod() ) { 1217 nmethod* nm = (nmethod*)cb; 1218 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1219 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1220 assert(csc->is_clean(), "IC should be clean"); 1221 } 1222 } 1223 break; 1224 } 1225 } 1226 } 1227} 1228 1229int nmethod::verify_icholder_relocations() { 1230 int count = 0; 1231 1232 RelocIterator iter(this); 1233 while(iter.next()) { 1234 if (iter.type() == relocInfo::virtual_call_type) { 1235 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1236 CompiledIC *ic = CompiledIC_at(&iter); 1237 if (TraceCompiledIC) { 1238 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1239 ic->print(); 1240 } 1241 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1242 count++; 1243 } 1244 } 1245 } 1246 1247 return count; 1248} 1249 1250// This is a private interface with the sweeper. 1251void nmethod::mark_as_seen_on_stack() { 1252 assert(is_alive(), "Must be an alive method"); 1253 // Set the traversal mark to ensure that the sweeper does 2 1254 // cleaning passes before moving to zombie. 1255 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1256} 1257 1258// Tell if a non-entrant method can be converted to a zombie (i.e., 1259// there are no activations on the stack, not in use by the VM, 1260// and not in use by the ServiceThread) 1261bool nmethod::can_convert_to_zombie() { 1262 assert(is_not_entrant(), "must be a non-entrant method"); 1263 1264 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1265 // count can be greater than the stack traversal count before it hits the 1266 // nmethod for the second time. 1267 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1268 !is_locked_by_vm(); 1269} 1270 1271void nmethod::inc_decompile_count() { 1272 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1273 // Could be gated by ProfileTraps, but do not bother... 1274 Method* m = method(); 1275 if (m == NULL) return; 1276 MethodData* mdo = m->method_data(); 1277 if (mdo == NULL) return; 1278 // There is a benign race here. See comments in methodData.hpp. 1279 mdo->inc_decompile_count(); 1280} 1281 1282void nmethod::increase_unloading_clock() { 1283 _global_unloading_clock++; 1284 if (_global_unloading_clock == 0) { 1285 // _nmethods are allocated with _unloading_clock == 0, 1286 // so 0 is never used as a clock value. 1287 _global_unloading_clock = 1; 1288 } 1289} 1290 1291void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1292 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1293} 1294 1295unsigned char nmethod::unloading_clock() { 1296 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1297} 1298 1299void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1300 1301 post_compiled_method_unload(); 1302 1303 // Since this nmethod is being unloaded, make sure that dependencies 1304 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1305 // indicate that this work is being done during a GC. 1306 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1307 assert(is_alive != NULL, "Should be non-NULL"); 1308 // A non-NULL is_alive closure indicates that this is being called during GC. 1309 flush_dependencies(is_alive); 1310 1311 // Break cycle between nmethod & method 1312 if (TraceClassUnloading && WizardMode) { 1313 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1314 " unloadable], Method*(" INTPTR_FORMAT 1315 "), cause(" INTPTR_FORMAT ")", 1316 p2i(this), p2i(_method), p2i(cause)); 1317 if (!Universe::heap()->is_gc_active()) 1318 cause->klass()->print(); 1319 } 1320 // Unlink the osr method, so we do not look this up again 1321 if (is_osr_method()) { 1322 invalidate_osr_method(); 1323 } 1324 // If _method is already NULL the Method* is about to be unloaded, 1325 // so we don't have to break the cycle. Note that it is possible to 1326 // have the Method* live here, in case we unload the nmethod because 1327 // it is pointing to some oop (other than the Method*) being unloaded. 1328 if (_method != NULL) { 1329 // OSR methods point to the Method*, but the Method* does not 1330 // point back! 1331 if (_method->code() == this) { 1332 _method->clear_code(); // Break a cycle 1333 } 1334 _method = NULL; // Clear the method of this dead nmethod 1335 } 1336 1337 // Make the class unloaded - i.e., change state and notify sweeper 1338 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1339 if (is_in_use()) { 1340 // Transitioning directly from live to unloaded -- so 1341 // we need to force a cache clean-up; remember this 1342 // for later on. 1343 CodeCache::set_needs_cache_clean(true); 1344 } 1345 1346 // Unregister must be done before the state change 1347 Universe::heap()->unregister_nmethod(this); 1348 1349 _state = unloaded; 1350 1351 // Log the unloading. 1352 log_state_change(); 1353 1354#if INCLUDE_JVMCI 1355 // The method can only be unloaded after the pointer to the installed code 1356 // Java wrapper is no longer alive. Here we need to clear out this weak 1357 // reference to the dead object. Nulling out the reference has to happen 1358 // after the method is unregistered since the original value may be still 1359 // tracked by the rset. 1360 maybe_invalidate_installed_code(); 1361 // Clear these out after the nmethod has been unregistered and any 1362 // updates to the InstalledCode instance have been performed. 1363 _jvmci_installed_code = NULL; 1364 _speculation_log = NULL; 1365#endif 1366 1367 // The Method* is gone at this point 1368 assert(_method == NULL, "Tautology"); 1369 1370 set_osr_link(NULL); 1371 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1372 NMethodSweeper::report_state_change(this); 1373} 1374 1375void nmethod::invalidate_osr_method() { 1376 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1377 // Remove from list of active nmethods 1378 if (method() != NULL) 1379 method()->method_holder()->remove_osr_nmethod(this); 1380} 1381 1382void nmethod::log_state_change() const { 1383 if (LogCompilation) { 1384 if (xtty != NULL) { 1385 ttyLocker ttyl; // keep the following output all in one block 1386 if (_state == unloaded) { 1387 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1388 os::current_thread_id()); 1389 } else { 1390 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1391 os::current_thread_id(), 1392 (_state == zombie ? " zombie='1'" : "")); 1393 } 1394 log_identity(xtty); 1395 xtty->stamp(); 1396 xtty->end_elem(); 1397 } 1398 } 1399 if (PrintCompilation && _state != unloaded) { 1400 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1401 } 1402} 1403 1404/** 1405 * Common functionality for both make_not_entrant and make_zombie 1406 */ 1407bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1408 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1409 assert(!is_zombie(), "should not already be a zombie"); 1410 1411 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1412 nmethodLocker nml(this); 1413 methodHandle the_method(method()); 1414 No_Safepoint_Verifier nsv; 1415 1416 // during patching, depending on the nmethod state we must notify the GC that 1417 // code has been unloaded, unregistering it. We cannot do this right while 1418 // holding the Patching_lock because we need to use the CodeCache_lock. This 1419 // would be prone to deadlocks. 1420 // This flag is used to remember whether we need to later lock and unregister. 1421 bool nmethod_needs_unregister = false; 1422 1423 { 1424 // invalidate osr nmethod before acquiring the patching lock since 1425 // they both acquire leaf locks and we don't want a deadlock. 1426 // This logic is equivalent to the logic below for patching the 1427 // verified entry point of regular methods. 1428 if (is_osr_method()) { 1429 // this effectively makes the osr nmethod not entrant 1430 invalidate_osr_method(); 1431 } 1432 1433 // Enter critical section. Does not block for safepoint. 1434 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1435 1436 if (_state == state) { 1437 // another thread already performed this transition so nothing 1438 // to do, but return false to indicate this. 1439 return false; 1440 } 1441 1442 // The caller can be calling the method statically or through an inline 1443 // cache call. 1444 if (!is_osr_method() && !is_not_entrant()) { 1445 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1446 SharedRuntime::get_handle_wrong_method_stub()); 1447 } 1448 1449 if (is_in_use()) { 1450 // It's a true state change, so mark the method as decompiled. 1451 // Do it only for transition from alive. 1452 inc_decompile_count(); 1453 } 1454 1455 // If the state is becoming a zombie, signal to unregister the nmethod with 1456 // the heap. 1457 // This nmethod may have already been unloaded during a full GC. 1458 if ((state == zombie) && !is_unloaded()) { 1459 nmethod_needs_unregister = true; 1460 } 1461 1462 // Must happen before state change. Otherwise we have a race condition in 1463 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1464 // transition its state from 'not_entrant' to 'zombie' without having to wait 1465 // for stack scanning. 1466 if (state == not_entrant) { 1467 mark_as_seen_on_stack(); 1468 OrderAccess::storestore(); 1469 } 1470 1471 // Change state 1472 _state = state; 1473 1474 // Log the transition once 1475 log_state_change(); 1476 1477 // Invalidate while holding the patching lock 1478 JVMCI_ONLY(maybe_invalidate_installed_code()); 1479 1480 // Remove nmethod from method. 1481 // We need to check if both the _code and _from_compiled_code_entry_point 1482 // refer to this nmethod because there is a race in setting these two fields 1483 // in Method* as seen in bugid 4947125. 1484 // If the vep() points to the zombie nmethod, the memory for the nmethod 1485 // could be flushed and the compiler and vtable stubs could still call 1486 // through it. 1487 if (method() != NULL && (method()->code() == this || 1488 method()->from_compiled_entry() == verified_entry_point())) { 1489 HandleMark hm; 1490 method()->clear_code(); 1491 } 1492 } // leave critical region under Patching_lock 1493 1494 // When the nmethod becomes zombie it is no longer alive so the 1495 // dependencies must be flushed. nmethods in the not_entrant 1496 // state will be flushed later when the transition to zombie 1497 // happens or they get unloaded. 1498 if (state == zombie) { 1499 { 1500 // Flushing dependecies must be done before any possible 1501 // safepoint can sneak in, otherwise the oops used by the 1502 // dependency logic could have become stale. 1503 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1504 if (nmethod_needs_unregister) { 1505 Universe::heap()->unregister_nmethod(this); 1506#ifdef JVMCI 1507 _jvmci_installed_code = NULL; 1508 _speculation_log = NULL; 1509#endif 1510 } 1511 flush_dependencies(NULL); 1512 } 1513 1514 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1515 // event and it hasn't already been reported for this nmethod then 1516 // report it now. The event may have been reported earilier if the GC 1517 // marked it for unloading). JvmtiDeferredEventQueue support means 1518 // we no longer go to a safepoint here. 1519 post_compiled_method_unload(); 1520 1521#ifdef ASSERT 1522 // It's no longer safe to access the oops section since zombie 1523 // nmethods aren't scanned for GC. 1524 _oops_are_stale = true; 1525#endif 1526 // the Method may be reclaimed by class unloading now that the 1527 // nmethod is in zombie state 1528 set_method(NULL); 1529 } else { 1530 assert(state == not_entrant, "other cases may need to be handled differently"); 1531 } 1532 1533 if (TraceCreateZombies) { 1534 ResourceMark m; 1535 tty->print_cr("nmethod <" INTPTR_FORMAT "> %s code made %s", p2i(this), this->method() ? this->method()->name_and_sig_as_C_string() : "null", (state == not_entrant) ? "not entrant" : "zombie"); 1536 } 1537 1538 NMethodSweeper::report_state_change(this); 1539 return true; 1540} 1541 1542void nmethod::flush() { 1543 // Note that there are no valid oops in the nmethod anymore. 1544 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1545 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1546 1547 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1548 assert_locked_or_safepoint(CodeCache_lock); 1549 1550 // completely deallocate this method 1551 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1552 if (PrintMethodFlushing) { 1553 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1554 "/Free CodeCache:" SIZE_FORMAT "Kb", 1555 _compile_id, p2i(this), CodeCache::blob_count(), 1556 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1557 } 1558 1559 // We need to deallocate any ExceptionCache data. 1560 // Note that we do not need to grab the nmethod lock for this, it 1561 // better be thread safe if we're disposing of it! 1562 ExceptionCache* ec = exception_cache(); 1563 set_exception_cache(NULL); 1564 while(ec != NULL) { 1565 ExceptionCache* next = ec->next(); 1566 delete ec; 1567 ec = next; 1568 } 1569 1570 if (on_scavenge_root_list()) { 1571 CodeCache::drop_scavenge_root_nmethod(this); 1572 } 1573 1574#ifdef SHARK 1575 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1576#endif // SHARK 1577 1578 ((CodeBlob*)(this))->flush(); 1579 1580 CodeCache::free(this); 1581} 1582 1583// 1584// Notify all classes this nmethod is dependent on that it is no 1585// longer dependent. This should only be called in two situations. 1586// First, when a nmethod transitions to a zombie all dependents need 1587// to be clear. Since zombification happens at a safepoint there's no 1588// synchronization issues. The second place is a little more tricky. 1589// During phase 1 of mark sweep class unloading may happen and as a 1590// result some nmethods may get unloaded. In this case the flushing 1591// of dependencies must happen during phase 1 since after GC any 1592// dependencies in the unloaded nmethod won't be updated, so 1593// traversing the dependency information in unsafe. In that case this 1594// function is called with a non-NULL argument and this function only 1595// notifies instanceKlasses that are reachable 1596 1597void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1598 assert_locked_or_safepoint(CodeCache_lock); 1599 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1600 "is_alive is non-NULL if and only if we are called during GC"); 1601 if (!has_flushed_dependencies()) { 1602 set_has_flushed_dependencies(); 1603 for (Dependencies::DepStream deps(this); deps.next(); ) { 1604 if (deps.type() == Dependencies::call_site_target_value) { 1605 // CallSite dependencies are managed on per-CallSite instance basis. 1606 oop call_site = deps.argument_oop(0); 1607 MethodHandles::remove_dependent_nmethod(call_site, this); 1608 } else { 1609 Klass* klass = deps.context_type(); 1610 if (klass == NULL) { 1611 continue; // ignore things like evol_method 1612 } 1613 // During GC the is_alive closure is non-NULL, and is used to 1614 // determine liveness of dependees that need to be updated. 1615 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1616 // The GC defers deletion of this entry, since there might be multiple threads 1617 // iterating over the _dependencies graph. Other call paths are single-threaded 1618 // and may delete it immediately. 1619 bool delete_immediately = is_alive == NULL; 1620 InstanceKlass::cast(klass)->remove_dependent_nmethod(this, delete_immediately); 1621 } 1622 } 1623 } 1624 } 1625} 1626 1627 1628// If this oop is not live, the nmethod can be unloaded. 1629bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1630 assert(root != NULL, "just checking"); 1631 oop obj = *root; 1632 if (obj == NULL || is_alive->do_object_b(obj)) { 1633 return false; 1634 } 1635 1636 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1637 // simply because one of its constant oops has gone dead. 1638 // No actual classes need to be unloaded in order for this to occur. 1639 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1640 make_unloaded(is_alive, obj); 1641 return true; 1642} 1643 1644// ------------------------------------------------------------------ 1645// post_compiled_method_load_event 1646// new method for install_code() path 1647// Transfer information from compilation to jvmti 1648void nmethod::post_compiled_method_load_event() { 1649 1650 Method* moop = method(); 1651 HOTSPOT_COMPILED_METHOD_LOAD( 1652 (char *) moop->klass_name()->bytes(), 1653 moop->klass_name()->utf8_length(), 1654 (char *) moop->name()->bytes(), 1655 moop->name()->utf8_length(), 1656 (char *) moop->signature()->bytes(), 1657 moop->signature()->utf8_length(), 1658 insts_begin(), insts_size()); 1659 1660 if (JvmtiExport::should_post_compiled_method_load() || 1661 JvmtiExport::should_post_compiled_method_unload()) { 1662 get_and_cache_jmethod_id(); 1663 } 1664 1665 if (JvmtiExport::should_post_compiled_method_load()) { 1666 // Let the Service thread (which is a real Java thread) post the event 1667 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1668 JvmtiDeferredEventQueue::enqueue( 1669 JvmtiDeferredEvent::compiled_method_load_event(this)); 1670 } 1671} 1672 1673jmethodID nmethod::get_and_cache_jmethod_id() { 1674 if (_jmethod_id == NULL) { 1675 // Cache the jmethod_id since it can no longer be looked up once the 1676 // method itself has been marked for unloading. 1677 _jmethod_id = method()->jmethod_id(); 1678 } 1679 return _jmethod_id; 1680} 1681 1682void nmethod::post_compiled_method_unload() { 1683 if (unload_reported()) { 1684 // During unloading we transition to unloaded and then to zombie 1685 // and the unloading is reported during the first transition. 1686 return; 1687 } 1688 1689 assert(_method != NULL && !is_unloaded(), "just checking"); 1690 DTRACE_METHOD_UNLOAD_PROBE(method()); 1691 1692 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1693 // post the event. Sometime later this nmethod will be made a zombie 1694 // by the sweeper but the Method* will not be valid at that point. 1695 // If the _jmethod_id is null then no load event was ever requested 1696 // so don't bother posting the unload. The main reason for this is 1697 // that the jmethodID is a weak reference to the Method* so if 1698 // it's being unloaded there's no way to look it up since the weak 1699 // ref will have been cleared. 1700 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1701 assert(!unload_reported(), "already unloaded"); 1702 JvmtiDeferredEvent event = 1703 JvmtiDeferredEvent::compiled_method_unload_event(this, 1704 _jmethod_id, insts_begin()); 1705 if (SafepointSynchronize::is_at_safepoint()) { 1706 // Don't want to take the queueing lock. Add it as pending and 1707 // it will get enqueued later. 1708 JvmtiDeferredEventQueue::add_pending_event(event); 1709 } else { 1710 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1711 JvmtiDeferredEventQueue::enqueue(event); 1712 } 1713 } 1714 1715 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1716 // any time. As the nmethod is being unloaded now we mark it has 1717 // having the unload event reported - this will ensure that we don't 1718 // attempt to report the event in the unlikely scenario where the 1719 // event is enabled at the time the nmethod is made a zombie. 1720 set_unload_reported(); 1721} 1722 1723void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1724 if (ic->is_icholder_call()) { 1725 // The only exception is compiledICHolder oops which may 1726 // yet be marked below. (We check this further below). 1727 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1728 1729 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1730 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1731 return; 1732 } 1733 } else { 1734 Metadata* ic_oop = ic->cached_metadata(); 1735 if (ic_oop != NULL) { 1736 if (ic_oop->is_klass()) { 1737 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1738 return; 1739 } 1740 } else if (ic_oop->is_method()) { 1741 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1742 return; 1743 } 1744 } else { 1745 ShouldNotReachHere(); 1746 } 1747 } 1748 } 1749 1750 ic->set_to_clean(); 1751} 1752 1753// This is called at the end of the strong tracing/marking phase of a 1754// GC to unload an nmethod if it contains otherwise unreachable 1755// oops. 1756 1757void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1758 // Make sure the oop's ready to receive visitors 1759 assert(!is_zombie() && !is_unloaded(), 1760 "should not call follow on zombie or unloaded nmethod"); 1761 1762 // If the method is not entrant then a JMP is plastered over the 1763 // first few bytes. If an oop in the old code was there, that oop 1764 // should not get GC'd. Skip the first few bytes of oops on 1765 // not-entrant methods. 1766 address low_boundary = verified_entry_point(); 1767 if (is_not_entrant()) { 1768 low_boundary += NativeJump::instruction_size; 1769 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1770 // (See comment above.) 1771 } 1772 1773 // The RedefineClasses() API can cause the class unloading invariant 1774 // to no longer be true. See jvmtiExport.hpp for details. 1775 // Also, leave a debugging breadcrumb in local flag. 1776 if (JvmtiExport::has_redefined_a_class()) { 1777 // This set of the unloading_occurred flag is done before the 1778 // call to post_compiled_method_unload() so that the unloading 1779 // of this nmethod is reported. 1780 unloading_occurred = true; 1781 } 1782 1783 // Exception cache 1784 clean_exception_cache(is_alive); 1785 1786 // If class unloading occurred we first iterate over all inline caches and 1787 // clear ICs where the cached oop is referring to an unloaded klass or method. 1788 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1789 // iteration below. 1790 if (unloading_occurred) { 1791 RelocIterator iter(this, low_boundary); 1792 while(iter.next()) { 1793 if (iter.type() == relocInfo::virtual_call_type) { 1794 CompiledIC *ic = CompiledIC_at(&iter); 1795 clean_ic_if_metadata_is_dead(ic, is_alive); 1796 } 1797 } 1798 } 1799 1800 // Compiled code 1801 { 1802 RelocIterator iter(this, low_boundary); 1803 while (iter.next()) { 1804 if (iter.type() == relocInfo::oop_type) { 1805 oop_Relocation* r = iter.oop_reloc(); 1806 // In this loop, we must only traverse those oops directly embedded in 1807 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1808 assert(1 == (r->oop_is_immediate()) + 1809 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1810 "oop must be found in exactly one place"); 1811 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1812 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1813 return; 1814 } 1815 } 1816 } 1817 } 1818 } 1819 1820 1821 // Scopes 1822 for (oop* p = oops_begin(); p < oops_end(); p++) { 1823 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1824 if (can_unload(is_alive, p, unloading_occurred)) { 1825 return; 1826 } 1827 } 1828 1829#if INCLUDE_JVMCI 1830 // Follow JVMCI method 1831 BarrierSet* bs = Universe::heap()->barrier_set(); 1832 if (_jvmci_installed_code != NULL) { 1833 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1834 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1835 clear_jvmci_installed_code(); 1836 } 1837 } else { 1838 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1839 return; 1840 } 1841 } 1842 } 1843 1844 if (_speculation_log != NULL) { 1845 if (!is_alive->do_object_b(_speculation_log)) { 1846 bs->write_ref_nmethod_pre(&_speculation_log, this); 1847 _speculation_log = NULL; 1848 bs->write_ref_nmethod_post(&_speculation_log, this); 1849 } 1850 } 1851#endif 1852 1853 1854 // Ensure that all metadata is still alive 1855 verify_metadata_loaders(low_boundary, is_alive); 1856} 1857 1858template <class CompiledICorStaticCall> 1859static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1860 // Ok, to lookup references to zombies here 1861 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1862 if (cb != NULL && cb->is_nmethod()) { 1863 nmethod* nm = (nmethod*)cb; 1864 1865 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1866 // The nmethod has not been processed yet. 1867 return true; 1868 } 1869 1870 // Clean inline caches pointing to both zombie and not_entrant methods 1871 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1872 ic->set_to_clean(); 1873 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); 1874 } 1875 } 1876 1877 return false; 1878} 1879 1880static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1881 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1882} 1883 1884static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1885 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1886} 1887 1888bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1889 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1890 1891 oop_Relocation* r = iter_at_oop->oop_reloc(); 1892 // Traverse those oops directly embedded in the code. 1893 // Other oops (oop_index>0) are seen as part of scopes_oops. 1894 assert(1 == (r->oop_is_immediate()) + 1895 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1896 "oop must be found in exactly one place"); 1897 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1898 // Unload this nmethod if the oop is dead. 1899 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1900 return true;; 1901 } 1902 } 1903 1904 return false; 1905} 1906 1907 1908bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1909 ResourceMark rm; 1910 1911 // Make sure the oop's ready to receive visitors 1912 assert(!is_zombie() && !is_unloaded(), 1913 "should not call follow on zombie or unloaded nmethod"); 1914 1915 // If the method is not entrant then a JMP is plastered over the 1916 // first few bytes. If an oop in the old code was there, that oop 1917 // should not get GC'd. Skip the first few bytes of oops on 1918 // not-entrant methods. 1919 address low_boundary = verified_entry_point(); 1920 if (is_not_entrant()) { 1921 low_boundary += NativeJump::instruction_size; 1922 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1923 // (See comment above.) 1924 } 1925 1926 // The RedefineClasses() API can cause the class unloading invariant 1927 // to no longer be true. See jvmtiExport.hpp for details. 1928 // Also, leave a debugging breadcrumb in local flag. 1929 if (JvmtiExport::has_redefined_a_class()) { 1930 // This set of the unloading_occurred flag is done before the 1931 // call to post_compiled_method_unload() so that the unloading 1932 // of this nmethod is reported. 1933 unloading_occurred = true; 1934 } 1935 1936 // Exception cache 1937 clean_exception_cache(is_alive); 1938 1939 bool is_unloaded = false; 1940 bool postponed = false; 1941 1942 RelocIterator iter(this, low_boundary); 1943 while(iter.next()) { 1944 1945 switch (iter.type()) { 1946 1947 case relocInfo::virtual_call_type: 1948 if (unloading_occurred) { 1949 // If class unloading occurred we first iterate over all inline caches and 1950 // clear ICs where the cached oop is referring to an unloaded klass or method. 1951 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1952 } 1953 1954 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1955 break; 1956 1957 case relocInfo::opt_virtual_call_type: 1958 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1959 break; 1960 1961 case relocInfo::static_call_type: 1962 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1963 break; 1964 1965 case relocInfo::oop_type: 1966 if (!is_unloaded) { 1967 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 1968 } 1969 break; 1970 1971 case relocInfo::metadata_type: 1972 break; // nothing to do. 1973 } 1974 } 1975 1976 if (is_unloaded) { 1977 return postponed; 1978 } 1979 1980 // Scopes 1981 for (oop* p = oops_begin(); p < oops_end(); p++) { 1982 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1983 if (can_unload(is_alive, p, unloading_occurred)) { 1984 is_unloaded = true; 1985 break; 1986 } 1987 } 1988 1989 if (is_unloaded) { 1990 return postponed; 1991 } 1992 1993#if INCLUDE_JVMCI 1994 // Follow JVMCI method 1995 BarrierSet* bs = Universe::heap()->barrier_set(); 1996 if (_jvmci_installed_code != NULL) { 1997 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1998 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1999 clear_jvmci_installed_code(); 2000 } 2001 } else { 2002 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 2003 is_unloaded = true; 2004 } 2005 } 2006 } 2007 2008 if (_speculation_log != NULL) { 2009 if (!is_alive->do_object_b(_speculation_log)) { 2010 bs->write_ref_nmethod_pre(&_speculation_log, this); 2011 _speculation_log = NULL; 2012 bs->write_ref_nmethod_post(&_speculation_log, this); 2013 } 2014 } 2015#endif 2016 2017 // Ensure that all metadata is still alive 2018 verify_metadata_loaders(low_boundary, is_alive); 2019 2020 return postponed; 2021} 2022 2023void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2024 ResourceMark rm; 2025 2026 // Make sure the oop's ready to receive visitors 2027 assert(!is_zombie(), 2028 "should not call follow on zombie nmethod"); 2029 2030 // If the method is not entrant then a JMP is plastered over the 2031 // first few bytes. If an oop in the old code was there, that oop 2032 // should not get GC'd. Skip the first few bytes of oops on 2033 // not-entrant methods. 2034 address low_boundary = verified_entry_point(); 2035 if (is_not_entrant()) { 2036 low_boundary += NativeJump::instruction_size; 2037 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2038 // (See comment above.) 2039 } 2040 2041 RelocIterator iter(this, low_boundary); 2042 while(iter.next()) { 2043 2044 switch (iter.type()) { 2045 2046 case relocInfo::virtual_call_type: 2047 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2048 break; 2049 2050 case relocInfo::opt_virtual_call_type: 2051 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2052 break; 2053 2054 case relocInfo::static_call_type: 2055 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2056 break; 2057 } 2058 } 2059} 2060 2061#ifdef ASSERT 2062 2063class CheckClass : AllStatic { 2064 static BoolObjectClosure* _is_alive; 2065 2066 // Check class_loader is alive for this bit of metadata. 2067 static void check_class(Metadata* md) { 2068 Klass* klass = NULL; 2069 if (md->is_klass()) { 2070 klass = ((Klass*)md); 2071 } else if (md->is_method()) { 2072 klass = ((Method*)md)->method_holder(); 2073 } else if (md->is_methodData()) { 2074 klass = ((MethodData*)md)->method()->method_holder(); 2075 } else { 2076 md->print(); 2077 ShouldNotReachHere(); 2078 } 2079 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2080 } 2081 public: 2082 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2083 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2084 _is_alive = is_alive; 2085 nm->metadata_do(check_class); 2086 } 2087}; 2088 2089// This is called during a safepoint so can use static data 2090BoolObjectClosure* CheckClass::_is_alive = NULL; 2091#endif // ASSERT 2092 2093 2094// Processing of oop references should have been sufficient to keep 2095// all strong references alive. Any weak references should have been 2096// cleared as well. Visit all the metadata and ensure that it's 2097// really alive. 2098void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2099#ifdef ASSERT 2100 RelocIterator iter(this, low_boundary); 2101 while (iter.next()) { 2102 // static_stub_Relocations may have dangling references to 2103 // Method*s so trim them out here. Otherwise it looks like 2104 // compiled code is maintaining a link to dead metadata. 2105 address static_call_addr = NULL; 2106 if (iter.type() == relocInfo::opt_virtual_call_type) { 2107 CompiledIC* cic = CompiledIC_at(&iter); 2108 if (!cic->is_call_to_interpreted()) { 2109 static_call_addr = iter.addr(); 2110 } 2111 } else if (iter.type() == relocInfo::static_call_type) { 2112 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2113 if (!csc->is_call_to_interpreted()) { 2114 static_call_addr = iter.addr(); 2115 } 2116 } 2117 if (static_call_addr != NULL) { 2118 RelocIterator sciter(this, low_boundary); 2119 while (sciter.next()) { 2120 if (sciter.type() == relocInfo::static_stub_type && 2121 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2122 sciter.static_stub_reloc()->clear_inline_cache(); 2123 } 2124 } 2125 } 2126 } 2127 // Check that the metadata embedded in the nmethod is alive 2128 CheckClass::do_check_class(is_alive, this); 2129#endif 2130} 2131 2132 2133// Iterate over metadata calling this function. Used by RedefineClasses 2134void nmethod::metadata_do(void f(Metadata*)) { 2135 address low_boundary = verified_entry_point(); 2136 if (is_not_entrant()) { 2137 low_boundary += NativeJump::instruction_size; 2138 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2139 // (See comment above.) 2140 } 2141 { 2142 // Visit all immediate references that are embedded in the instruction stream. 2143 RelocIterator iter(this, low_boundary); 2144 while (iter.next()) { 2145 if (iter.type() == relocInfo::metadata_type ) { 2146 metadata_Relocation* r = iter.metadata_reloc(); 2147 // In this metadata, we must only follow those metadatas directly embedded in 2148 // the code. Other metadatas (oop_index>0) are seen as part of 2149 // the metadata section below. 2150 assert(1 == (r->metadata_is_immediate()) + 2151 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2152 "metadata must be found in exactly one place"); 2153 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2154 Metadata* md = r->metadata_value(); 2155 if (md != _method) f(md); 2156 } 2157 } else if (iter.type() == relocInfo::virtual_call_type) { 2158 // Check compiledIC holders associated with this nmethod 2159 CompiledIC *ic = CompiledIC_at(&iter); 2160 if (ic->is_icholder_call()) { 2161 CompiledICHolder* cichk = ic->cached_icholder(); 2162 f(cichk->holder_method()); 2163 f(cichk->holder_klass()); 2164 } else { 2165 Metadata* ic_oop = ic->cached_metadata(); 2166 if (ic_oop != NULL) { 2167 f(ic_oop); 2168 } 2169 } 2170 } 2171 } 2172 } 2173 2174 // Visit the metadata section 2175 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2176 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2177 Metadata* md = *p; 2178 f(md); 2179 } 2180 2181 // Visit metadata not embedded in the other places. 2182 if (_method != NULL) f(_method); 2183} 2184 2185void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2186 // make sure the oops ready to receive visitors 2187 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2188 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2189 2190 // If the method is not entrant or zombie then a JMP is plastered over the 2191 // first few bytes. If an oop in the old code was there, that oop 2192 // should not get GC'd. Skip the first few bytes of oops on 2193 // not-entrant methods. 2194 address low_boundary = verified_entry_point(); 2195 if (is_not_entrant()) { 2196 low_boundary += NativeJump::instruction_size; 2197 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2198 // (See comment above.) 2199 } 2200 2201#if INCLUDE_JVMCI 2202 if (_jvmci_installed_code != NULL) { 2203 f->do_oop((oop*) &_jvmci_installed_code); 2204 } 2205 if (_speculation_log != NULL) { 2206 f->do_oop((oop*) &_speculation_log); 2207 } 2208#endif 2209 2210 RelocIterator iter(this, low_boundary); 2211 2212 while (iter.next()) { 2213 if (iter.type() == relocInfo::oop_type ) { 2214 oop_Relocation* r = iter.oop_reloc(); 2215 // In this loop, we must only follow those oops directly embedded in 2216 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2217 assert(1 == (r->oop_is_immediate()) + 2218 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2219 "oop must be found in exactly one place"); 2220 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2221 f->do_oop(r->oop_addr()); 2222 } 2223 } 2224 } 2225 2226 // Scopes 2227 // This includes oop constants not inlined in the code stream. 2228 for (oop* p = oops_begin(); p < oops_end(); p++) { 2229 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2230 f->do_oop(p); 2231 } 2232} 2233 2234#define NMETHOD_SENTINEL ((nmethod*)badAddress) 2235 2236nmethod* volatile nmethod::_oops_do_mark_nmethods; 2237 2238// An nmethod is "marked" if its _mark_link is set non-null. 2239// Even if it is the end of the linked list, it will have a non-null link value, 2240// as long as it is on the list. 2241// This code must be MP safe, because it is used from parallel GC passes. 2242bool nmethod::test_set_oops_do_mark() { 2243 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2244 nmethod* observed_mark_link = _oops_do_mark_link; 2245 if (observed_mark_link == NULL) { 2246 // Claim this nmethod for this thread to mark. 2247 observed_mark_link = (nmethod*) 2248 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2249 if (observed_mark_link == NULL) { 2250 2251 // Atomically append this nmethod (now claimed) to the head of the list: 2252 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2253 for (;;) { 2254 nmethod* required_mark_nmethods = observed_mark_nmethods; 2255 _oops_do_mark_link = required_mark_nmethods; 2256 observed_mark_nmethods = (nmethod*) 2257 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2258 if (observed_mark_nmethods == required_mark_nmethods) 2259 break; 2260 } 2261 // Mark was clear when we first saw this guy. 2262 if (TraceScavenge) { print_on(tty, "oops_do, mark"); } 2263 return false; 2264 } 2265 } 2266 // On fall through, another racing thread marked this nmethod before we did. 2267 return true; 2268} 2269 2270void nmethod::oops_do_marking_prologue() { 2271 if (TraceScavenge) { tty->print_cr("[oops_do_marking_prologue"); } 2272 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2273 // We use cmpxchg_ptr instead of regular assignment here because the user 2274 // may fork a bunch of threads, and we need them all to see the same state. 2275 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2276 guarantee(observed == NULL, "no races in this sequential code"); 2277} 2278 2279void nmethod::oops_do_marking_epilogue() { 2280 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2281 nmethod* cur = _oops_do_mark_nmethods; 2282 while (cur != NMETHOD_SENTINEL) { 2283 assert(cur != NULL, "not NULL-terminated"); 2284 nmethod* next = cur->_oops_do_mark_link; 2285 cur->_oops_do_mark_link = NULL; 2286 DEBUG_ONLY(cur->verify_oop_relocations()); 2287 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2288 cur = next; 2289 } 2290 void* required = _oops_do_mark_nmethods; 2291 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2292 guarantee(observed == required, "no races in this sequential code"); 2293 if (TraceScavenge) { tty->print_cr("oops_do_marking_epilogue]"); } 2294} 2295 2296class DetectScavengeRoot: public OopClosure { 2297 bool _detected_scavenge_root; 2298public: 2299 DetectScavengeRoot() : _detected_scavenge_root(false) 2300 { NOT_PRODUCT(_print_nm = NULL); } 2301 bool detected_scavenge_root() { return _detected_scavenge_root; } 2302 virtual void do_oop(oop* p) { 2303 if ((*p) != NULL && (*p)->is_scavengable()) { 2304 NOT_PRODUCT(maybe_print(p)); 2305 _detected_scavenge_root = true; 2306 } 2307 } 2308 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2309 2310#ifndef PRODUCT 2311 nmethod* _print_nm; 2312 void maybe_print(oop* p) { 2313 if (_print_nm == NULL) return; 2314 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2315 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2316 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 2317 p2i(*p), p2i(p)); 2318 (*p)->print(); 2319 } 2320#endif //PRODUCT 2321}; 2322 2323bool nmethod::detect_scavenge_root_oops() { 2324 DetectScavengeRoot detect_scavenge_root; 2325 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2326 oops_do(&detect_scavenge_root); 2327 return detect_scavenge_root.detected_scavenge_root(); 2328} 2329 2330// Method that knows how to preserve outgoing arguments at call. This method must be 2331// called with a frame corresponding to a Java invoke 2332void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2333#ifndef SHARK 2334 if (method() != NULL && !method()->is_native()) { 2335 address pc = fr.pc(); 2336 SimpleScopeDesc ssd(this, pc); 2337 Bytecode_invoke call(ssd.method(), ssd.bci()); 2338 bool has_receiver = call.has_receiver(); 2339 bool has_appendix = call.has_appendix(); 2340 Symbol* signature = call.signature(); 2341 2342 // The method attached by JIT-compilers should be used, if present. 2343 // Bytecode can be inaccurate in such case. 2344 Method* callee = attached_method_before_pc(pc); 2345 if (callee != NULL) { 2346 has_receiver = !(callee->access_flags().is_static()); 2347 has_appendix = false; 2348 signature = callee->signature(); 2349 } 2350 2351 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2352 } 2353#endif // !SHARK 2354} 2355 2356inline bool includes(void* p, void* from, void* to) { 2357 return from <= p && p < to; 2358} 2359 2360 2361void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2362 assert(count >= 2, "must be sentinel values, at least"); 2363 2364#ifdef ASSERT 2365 // must be sorted and unique; we do a binary search in find_pc_desc() 2366 int prev_offset = pcs[0].pc_offset(); 2367 assert(prev_offset == PcDesc::lower_offset_limit, 2368 "must start with a sentinel"); 2369 for (int i = 1; i < count; i++) { 2370 int this_offset = pcs[i].pc_offset(); 2371 assert(this_offset > prev_offset, "offsets must be sorted"); 2372 prev_offset = this_offset; 2373 } 2374 assert(prev_offset == PcDesc::upper_offset_limit, 2375 "must end with a sentinel"); 2376#endif //ASSERT 2377 2378 // Search for MethodHandle invokes and tag the nmethod. 2379 for (int i = 0; i < count; i++) { 2380 if (pcs[i].is_method_handle_invoke()) { 2381 set_has_method_handle_invokes(true); 2382 break; 2383 } 2384 } 2385 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2386 2387 int size = count * sizeof(PcDesc); 2388 assert(scopes_pcs_size() >= size, "oob"); 2389 memcpy(scopes_pcs_begin(), pcs, size); 2390 2391 // Adjust the final sentinel downward. 2392 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2393 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2394 last_pc->set_pc_offset(content_size() + 1); 2395 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2396 // Fill any rounding gaps with copies of the last record. 2397 last_pc[1] = last_pc[0]; 2398 } 2399 // The following assert could fail if sizeof(PcDesc) is not 2400 // an integral multiple of oopSize (the rounding term). 2401 // If it fails, change the logic to always allocate a multiple 2402 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2403 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2404} 2405 2406void nmethod::copy_scopes_data(u_char* buffer, int size) { 2407 assert(scopes_data_size() >= size, "oob"); 2408 memcpy(scopes_data_begin(), buffer, size); 2409} 2410 2411// When using JVMCI the address might be off by the size of a call instruction. 2412bool nmethod::is_deopt_entry(address pc) { 2413 return pc == deopt_handler_begin() 2414#if INCLUDE_JVMCI 2415 || pc == (deopt_handler_begin() + NativeCall::instruction_size) 2416#endif 2417 ; 2418} 2419 2420#ifdef ASSERT 2421static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2422 PcDesc* lower = nm->scopes_pcs_begin(); 2423 PcDesc* upper = nm->scopes_pcs_end(); 2424 lower += 1; // exclude initial sentinel 2425 PcDesc* res = NULL; 2426 for (PcDesc* p = lower; p < upper; p++) { 2427 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2428 if (match_desc(p, pc_offset, approximate)) { 2429 if (res == NULL) 2430 res = p; 2431 else 2432 res = (PcDesc*) badAddress; 2433 } 2434 } 2435 return res; 2436} 2437#endif 2438 2439 2440// Finds a PcDesc with real-pc equal to "pc" 2441PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2442 address base_address = code_begin(); 2443 if ((pc < base_address) || 2444 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2445 return NULL; // PC is wildly out of range 2446 } 2447 int pc_offset = (int) (pc - base_address); 2448 2449 // Check the PcDesc cache if it contains the desired PcDesc 2450 // (This as an almost 100% hit rate.) 2451 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2452 if (res != NULL) { 2453 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2454 return res; 2455 } 2456 2457 // Fallback algorithm: quasi-linear search for the PcDesc 2458 // Find the last pc_offset less than the given offset. 2459 // The successor must be the required match, if there is a match at all. 2460 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2461 PcDesc* lower = scopes_pcs_begin(); 2462 PcDesc* upper = scopes_pcs_end(); 2463 upper -= 1; // exclude final sentinel 2464 if (lower >= upper) return NULL; // native method; no PcDescs at all 2465 2466#define assert_LU_OK \ 2467 /* invariant on lower..upper during the following search: */ \ 2468 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2469 assert(upper->pc_offset() >= pc_offset, "sanity") 2470 assert_LU_OK; 2471 2472 // Use the last successful return as a split point. 2473 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2474 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2475 if (mid->pc_offset() < pc_offset) { 2476 lower = mid; 2477 } else { 2478 upper = mid; 2479 } 2480 2481 // Take giant steps at first (4096, then 256, then 16, then 1) 2482 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2483 const int RADIX = (1 << LOG2_RADIX); 2484 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2485 while ((mid = lower + step) < upper) { 2486 assert_LU_OK; 2487 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2488 if (mid->pc_offset() < pc_offset) { 2489 lower = mid; 2490 } else { 2491 upper = mid; 2492 break; 2493 } 2494 } 2495 assert_LU_OK; 2496 } 2497 2498 // Sneak up on the value with a linear search of length ~16. 2499 while (true) { 2500 assert_LU_OK; 2501 mid = lower + 1; 2502 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2503 if (mid->pc_offset() < pc_offset) { 2504 lower = mid; 2505 } else { 2506 upper = mid; 2507 break; 2508 } 2509 } 2510#undef assert_LU_OK 2511 2512 if (match_desc(upper, pc_offset, approximate)) { 2513 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2514 _pc_desc_cache.add_pc_desc(upper); 2515 return upper; 2516 } else { 2517 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2518 return NULL; 2519 } 2520} 2521 2522 2523void nmethod::check_all_dependencies(DepChange& changes) { 2524 // Checked dependencies are allocated into this ResourceMark 2525 ResourceMark rm; 2526 2527 // Turn off dependency tracing while actually testing dependencies. 2528 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2529 2530 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2531 &DependencySignature::equals, 11027> DepTable; 2532 2533 DepTable* table = new DepTable(); 2534 2535 // Iterate over live nmethods and check dependencies of all nmethods that are not 2536 // marked for deoptimization. A particular dependency is only checked once. 2537 NMethodIterator iter; 2538 while(iter.next()) { 2539 nmethod* nm = iter.method(); 2540 // Only notify for live nmethods 2541 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2542 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2543 // Construct abstraction of a dependency. 2544 DependencySignature* current_sig = new DependencySignature(deps); 2545 2546 // Determine if dependency is already checked. table->put(...) returns 2547 // 'true' if the dependency is added (i.e., was not in the hashtable). 2548 if (table->put(*current_sig, 1)) { 2549 if (deps.check_dependency() != NULL) { 2550 // Dependency checking failed. Print out information about the failed 2551 // dependency and finally fail with an assert. We can fail here, since 2552 // dependency checking is never done in a product build. 2553 tty->print_cr("Failed dependency:"); 2554 changes.print(); 2555 nm->print(); 2556 nm->print_dependencies(); 2557 assert(false, "Should have been marked for deoptimization"); 2558 } 2559 } 2560 } 2561 } 2562 } 2563} 2564 2565bool nmethod::check_dependency_on(DepChange& changes) { 2566 // What has happened: 2567 // 1) a new class dependee has been added 2568 // 2) dependee and all its super classes have been marked 2569 bool found_check = false; // set true if we are upset 2570 for (Dependencies::DepStream deps(this); deps.next(); ) { 2571 // Evaluate only relevant dependencies. 2572 if (deps.spot_check_dependency_at(changes) != NULL) { 2573 found_check = true; 2574 NOT_DEBUG(break); 2575 } 2576 } 2577 return found_check; 2578} 2579 2580bool nmethod::is_evol_dependent_on(Klass* dependee) { 2581 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2582 Array<Method*>* dependee_methods = dependee_ik->methods(); 2583 for (Dependencies::DepStream deps(this); deps.next(); ) { 2584 if (deps.type() == Dependencies::evol_method) { 2585 Method* method = deps.method_argument(0); 2586 for (int j = 0; j < dependee_methods->length(); j++) { 2587 if (dependee_methods->at(j) == method) { 2588 // RC_TRACE macro has an embedded ResourceMark 2589 RC_TRACE(0x01000000, 2590 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2591 _method->method_holder()->external_name(), 2592 _method->name()->as_C_string(), 2593 _method->signature()->as_C_string(), compile_id(), 2594 method->method_holder()->external_name(), 2595 method->name()->as_C_string(), 2596 method->signature()->as_C_string())); 2597 if (TraceDependencies || LogCompilation) 2598 deps.log_dependency(dependee); 2599 return true; 2600 } 2601 } 2602 } 2603 } 2604 return false; 2605} 2606 2607// Called from mark_for_deoptimization, when dependee is invalidated. 2608bool nmethod::is_dependent_on_method(Method* dependee) { 2609 for (Dependencies::DepStream deps(this); deps.next(); ) { 2610 if (deps.type() != Dependencies::evol_method) 2611 continue; 2612 Method* method = deps.method_argument(0); 2613 if (method == dependee) return true; 2614 } 2615 return false; 2616} 2617 2618 2619bool nmethod::is_patchable_at(address instr_addr) { 2620 assert(insts_contains(instr_addr), "wrong nmethod used"); 2621 if (is_zombie()) { 2622 // a zombie may never be patched 2623 return false; 2624 } 2625 return true; 2626} 2627 2628 2629address nmethod::continuation_for_implicit_exception(address pc) { 2630 // Exception happened outside inline-cache check code => we are inside 2631 // an active nmethod => use cpc to determine a return address 2632 int exception_offset = pc - code_begin(); 2633 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2634#ifdef ASSERT 2635 if (cont_offset == 0) { 2636 Thread* thread = Thread::current(); 2637 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2638 HandleMark hm(thread); 2639 ResourceMark rm(thread); 2640 CodeBlob* cb = CodeCache::find_blob(pc); 2641 assert(cb != NULL && cb == this, ""); 2642 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2643 print(); 2644 method()->print_codes(); 2645 print_code(); 2646 print_pcs(); 2647 } 2648#endif 2649 if (cont_offset == 0) { 2650 // Let the normal error handling report the exception 2651 return NULL; 2652 } 2653 return code_begin() + cont_offset; 2654} 2655 2656 2657 2658void nmethod_init() { 2659 // make sure you didn't forget to adjust the filler fields 2660 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2661} 2662 2663 2664//------------------------------------------------------------------------------------------- 2665 2666 2667// QQQ might we make this work from a frame?? 2668nmethodLocker::nmethodLocker(address pc) { 2669 CodeBlob* cb = CodeCache::find_blob(pc); 2670 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2671 _nm = (nmethod*)cb; 2672 lock_nmethod(_nm); 2673} 2674 2675// Only JvmtiDeferredEvent::compiled_method_unload_event() 2676// should pass zombie_ok == true. 2677void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2678 if (nm == NULL) return; 2679 Atomic::inc(&nm->_lock_count); 2680 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2681} 2682 2683void nmethodLocker::unlock_nmethod(nmethod* nm) { 2684 if (nm == NULL) return; 2685 Atomic::dec(&nm->_lock_count); 2686 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2687} 2688 2689// ----------------------------------------------------------------------------- 2690// nmethod::get_deopt_original_pc 2691// 2692// Return the original PC for the given PC if: 2693// (a) the given PC belongs to a nmethod and 2694// (b) it is a deopt PC 2695address nmethod::get_deopt_original_pc(const frame* fr) { 2696 if (fr->cb() == NULL) return NULL; 2697 2698 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2699 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2700 return nm->get_original_pc(fr); 2701 2702 return NULL; 2703} 2704 2705 2706// ----------------------------------------------------------------------------- 2707// MethodHandle 2708 2709bool nmethod::is_method_handle_return(address return_pc) { 2710 if (!has_method_handle_invokes()) return false; 2711 PcDesc* pd = pc_desc_at(return_pc); 2712 if (pd == NULL) 2713 return false; 2714 return pd->is_method_handle_invoke(); 2715} 2716 2717 2718// ----------------------------------------------------------------------------- 2719// Verification 2720 2721class VerifyOopsClosure: public OopClosure { 2722 nmethod* _nm; 2723 bool _ok; 2724public: 2725 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2726 bool ok() { return _ok; } 2727 virtual void do_oop(oop* p) { 2728 if ((*p) == NULL || (*p)->is_oop()) return; 2729 if (_ok) { 2730 _nm->print_nmethod(true); 2731 _ok = false; 2732 } 2733 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2734 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2735 } 2736 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2737}; 2738 2739void nmethod::verify() { 2740 2741 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2742 // seems odd. 2743 2744 if (is_zombie() || is_not_entrant() || is_unloaded()) 2745 return; 2746 2747 // Make sure all the entry points are correctly aligned for patching. 2748 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2749 2750 // assert(method()->is_oop(), "must be valid"); 2751 2752 ResourceMark rm; 2753 2754 if (!CodeCache::contains(this)) { 2755 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2756 } 2757 2758 if(is_native_method() ) 2759 return; 2760 2761 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2762 if (nm != this) { 2763 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2764 } 2765 2766 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2767 if (! p->verify(this)) { 2768 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2769 } 2770 } 2771 2772 VerifyOopsClosure voc(this); 2773 oops_do(&voc); 2774 assert(voc.ok(), "embedded oops must be OK"); 2775 verify_scavenge_root_oops(); 2776 2777 verify_scopes(); 2778} 2779 2780 2781void nmethod::verify_interrupt_point(address call_site) { 2782 // Verify IC only when nmethod installation is finished. 2783 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2784 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2785 if (is_installed) { 2786 Thread *cur = Thread::current(); 2787 if (CompiledIC_lock->owner() == cur || 2788 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2789 SafepointSynchronize::is_at_safepoint())) { 2790 CompiledIC_at(this, call_site); 2791 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2792 } else { 2793 MutexLocker ml_verify (CompiledIC_lock); 2794 CompiledIC_at(this, call_site); 2795 } 2796 } 2797 2798 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2799 assert(pd != NULL, "PcDesc must exist"); 2800 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2801 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2802 pd->return_oop()); 2803 !sd->is_top(); sd = sd->sender()) { 2804 sd->verify(); 2805 } 2806} 2807 2808void nmethod::verify_scopes() { 2809 if( !method() ) return; // Runtime stubs have no scope 2810 if (method()->is_native()) return; // Ignore stub methods. 2811 // iterate through all interrupt point 2812 // and verify the debug information is valid. 2813 RelocIterator iter((nmethod*)this); 2814 while (iter.next()) { 2815 address stub = NULL; 2816 switch (iter.type()) { 2817 case relocInfo::virtual_call_type: 2818 verify_interrupt_point(iter.addr()); 2819 break; 2820 case relocInfo::opt_virtual_call_type: 2821 stub = iter.opt_virtual_call_reloc()->static_stub(); 2822 verify_interrupt_point(iter.addr()); 2823 break; 2824 case relocInfo::static_call_type: 2825 stub = iter.static_call_reloc()->static_stub(); 2826 //verify_interrupt_point(iter.addr()); 2827 break; 2828 case relocInfo::runtime_call_type: 2829 address destination = iter.reloc()->value(); 2830 // Right now there is no way to find out which entries support 2831 // an interrupt point. It would be nice if we had this 2832 // information in a table. 2833 break; 2834 } 2835 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2836 } 2837} 2838 2839 2840// ----------------------------------------------------------------------------- 2841// Non-product code 2842#ifndef PRODUCT 2843 2844class DebugScavengeRoot: public OopClosure { 2845 nmethod* _nm; 2846 bool _ok; 2847public: 2848 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2849 bool ok() { return _ok; } 2850 virtual void do_oop(oop* p) { 2851 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2852 if (_ok) { 2853 _nm->print_nmethod(true); 2854 _ok = false; 2855 } 2856 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2857 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2858 (*p)->print(); 2859 } 2860 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2861}; 2862 2863void nmethod::verify_scavenge_root_oops() { 2864 if (UseG1GC) { 2865 return; 2866 } 2867 2868 if (!on_scavenge_root_list()) { 2869 // Actually look inside, to verify the claim that it's clean. 2870 DebugScavengeRoot debug_scavenge_root(this); 2871 oops_do(&debug_scavenge_root); 2872 if (!debug_scavenge_root.ok()) 2873 fatal("found an unadvertised bad scavengable oop in the code cache"); 2874 } 2875 assert(scavenge_root_not_marked(), ""); 2876} 2877 2878#endif // PRODUCT 2879 2880// Printing operations 2881 2882void nmethod::print() const { 2883 ResourceMark rm; 2884 ttyLocker ttyl; // keep the following output all in one block 2885 2886 tty->print("Compiled method "); 2887 2888 if (is_compiled_by_c1()) { 2889 tty->print("(c1) "); 2890 } else if (is_compiled_by_c2()) { 2891 tty->print("(c2) "); 2892 } else if (is_compiled_by_shark()) { 2893 tty->print("(shark) "); 2894 } else if (is_compiled_by_jvmci()) { 2895 tty->print("(JVMCI) "); 2896 } else { 2897 tty->print("(nm) "); 2898 } 2899 2900 print_on(tty, NULL); 2901 2902 if (WizardMode) { 2903 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2904 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2905 tty->print(" { "); 2906 if (is_in_use()) tty->print("in_use "); 2907 if (is_not_entrant()) tty->print("not_entrant "); 2908 if (is_zombie()) tty->print("zombie "); 2909 if (is_unloaded()) tty->print("unloaded "); 2910 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2911 tty->print_cr("}:"); 2912 } 2913 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2914 p2i(this), 2915 p2i(this) + size(), 2916 size()); 2917 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2918 p2i(relocation_begin()), 2919 p2i(relocation_end()), 2920 relocation_size()); 2921 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2922 p2i(consts_begin()), 2923 p2i(consts_end()), 2924 consts_size()); 2925 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2926 p2i(insts_begin()), 2927 p2i(insts_end()), 2928 insts_size()); 2929 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2930 p2i(stub_begin()), 2931 p2i(stub_end()), 2932 stub_size()); 2933 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2934 p2i(oops_begin()), 2935 p2i(oops_end()), 2936 oops_size()); 2937 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2938 p2i(metadata_begin()), 2939 p2i(metadata_end()), 2940 metadata_size()); 2941 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2942 p2i(scopes_data_begin()), 2943 p2i(scopes_data_end()), 2944 scopes_data_size()); 2945 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2946 p2i(scopes_pcs_begin()), 2947 p2i(scopes_pcs_end()), 2948 scopes_pcs_size()); 2949 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2950 p2i(dependencies_begin()), 2951 p2i(dependencies_end()), 2952 dependencies_size()); 2953 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2954 p2i(handler_table_begin()), 2955 p2i(handler_table_end()), 2956 handler_table_size()); 2957 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2958 p2i(nul_chk_table_begin()), 2959 p2i(nul_chk_table_end()), 2960 nul_chk_table_size()); 2961} 2962 2963void nmethod::print_code() { 2964 HandleMark hm; 2965 ResourceMark m; 2966 Disassembler::decode(this); 2967} 2968 2969 2970#ifndef PRODUCT 2971 2972void nmethod::print_scopes() { 2973 // Find the first pc desc for all scopes in the code and print it. 2974 ResourceMark rm; 2975 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2976 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2977 continue; 2978 2979 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2980 while (sd != NULL) { 2981 sd->print_on(tty, p); 2982 sd = sd->sender(); 2983 } 2984 } 2985} 2986 2987void nmethod::print_dependencies() { 2988 ResourceMark rm; 2989 ttyLocker ttyl; // keep the following output all in one block 2990 tty->print_cr("Dependencies:"); 2991 for (Dependencies::DepStream deps(this); deps.next(); ) { 2992 deps.print_dependency(); 2993 Klass* ctxk = deps.context_type(); 2994 if (ctxk != NULL) { 2995 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2996 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2997 } 2998 } 2999 deps.log_dependency(); // put it into the xml log also 3000 } 3001} 3002 3003 3004void nmethod::print_relocations() { 3005 ResourceMark m; // in case methods get printed via the debugger 3006 tty->print_cr("relocations:"); 3007 RelocIterator iter(this); 3008 iter.print(); 3009 if (UseRelocIndex) { 3010 jint* index_end = (jint*)relocation_end() - 1; 3011 jint index_size = *index_end; 3012 jint* index_start = (jint*)( (address)index_end - index_size ); 3013 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 3014 if (index_size > 0) { 3015 jint* ip; 3016 for (ip = index_start; ip+2 <= index_end; ip += 2) 3017 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 3018 ip[0], 3019 ip[1], 3020 p2i(header_end()+ip[0]), 3021 p2i(relocation_begin()-1+ip[1])); 3022 for (; ip < index_end; ip++) 3023 tty->print_cr(" (%d ?)", ip[0]); 3024 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 3025 ip++; 3026 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 3027 } 3028 } 3029} 3030 3031 3032void nmethod::print_pcs() { 3033 ResourceMark m; // in case methods get printed via debugger 3034 tty->print_cr("pc-bytecode offsets:"); 3035 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3036 p->print(this); 3037 } 3038} 3039 3040void nmethod::print_recorded_oops() { 3041 tty->print_cr("Recorded oops:"); 3042 for (int i = 0; i < oops_count(); i++) { 3043 oop o = oop_at(i); 3044 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 3045 if (o == (oop)Universe::non_oop_word()) { 3046 tty->print("non-oop word"); 3047 } else { 3048 o->print_value(); 3049 } 3050 tty->cr(); 3051 } 3052} 3053 3054void nmethod::print_recorded_metadata() { 3055 tty->print_cr("Recorded metadata:"); 3056 for (int i = 0; i < metadata_count(); i++) { 3057 Metadata* m = metadata_at(i); 3058 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 3059 if (m == (Metadata*)Universe::non_oop_word()) { 3060 tty->print("non-metadata word"); 3061 } else { 3062 m->print_value_on_maybe_null(tty); 3063 } 3064 tty->cr(); 3065 } 3066} 3067 3068#endif // PRODUCT 3069 3070const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3071 RelocIterator iter(this, begin, end); 3072 bool have_one = false; 3073 while (iter.next()) { 3074 have_one = true; 3075 switch (iter.type()) { 3076 case relocInfo::none: return "no_reloc"; 3077 case relocInfo::oop_type: { 3078 stringStream st; 3079 oop_Relocation* r = iter.oop_reloc(); 3080 oop obj = r->oop_value(); 3081 st.print("oop("); 3082 if (obj == NULL) st.print("NULL"); 3083 else obj->print_value_on(&st); 3084 st.print(")"); 3085 return st.as_string(); 3086 } 3087 case relocInfo::metadata_type: { 3088 stringStream st; 3089 metadata_Relocation* r = iter.metadata_reloc(); 3090 Metadata* obj = r->metadata_value(); 3091 st.print("metadata("); 3092 if (obj == NULL) st.print("NULL"); 3093 else obj->print_value_on(&st); 3094 st.print(")"); 3095 return st.as_string(); 3096 } 3097 case relocInfo::runtime_call_type: { 3098 stringStream st; 3099 st.print("runtime_call"); 3100 runtime_call_Relocation* r = iter.runtime_call_reloc(); 3101 address dest = r->destination(); 3102 CodeBlob* cb = CodeCache::find_blob(dest); 3103 if (cb != NULL) { 3104 st.print(" %s", cb->name()); 3105 } 3106 return st.as_string(); 3107 } 3108 case relocInfo::virtual_call_type: { 3109 stringStream st; 3110 st.print_raw("virtual_call"); 3111 virtual_call_Relocation* r = iter.virtual_call_reloc(); 3112 Method* m = r->method_value(); 3113 if (m != NULL) { 3114 assert(m->is_method(), ""); 3115 m->print_short_name(&st); 3116 } 3117 return st.as_string(); 3118 } 3119 case relocInfo::opt_virtual_call_type: { 3120 stringStream st; 3121 st.print_raw("optimized virtual_call"); 3122 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 3123 Method* m = r->method_value(); 3124 if (m != NULL) { 3125 assert(m->is_method(), ""); 3126 m->print_short_name(&st); 3127 } 3128 return st.as_string(); 3129 } 3130 case relocInfo::static_call_type: { 3131 stringStream st; 3132 st.print_raw("static_call"); 3133 static_call_Relocation* r = iter.static_call_reloc(); 3134 Method* m = r->method_value(); 3135 if (m != NULL) { 3136 assert(m->is_method(), ""); 3137 m->print_short_name(&st); 3138 } 3139 return st.as_string(); 3140 } 3141 case relocInfo::static_stub_type: return "static_stub"; 3142 case relocInfo::external_word_type: return "external_word"; 3143 case relocInfo::internal_word_type: return "internal_word"; 3144 case relocInfo::section_word_type: return "section_word"; 3145 case relocInfo::poll_type: return "poll"; 3146 case relocInfo::poll_return_type: return "poll_return"; 3147 case relocInfo::type_mask: return "type_bit_mask"; 3148 } 3149 } 3150 return have_one ? "other" : NULL; 3151} 3152 3153// Return a the last scope in (begin..end] 3154ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3155 PcDesc* p = pc_desc_near(begin+1); 3156 if (p != NULL && p->real_pc(this) <= end) { 3157 return new ScopeDesc(this, p->scope_decode_offset(), 3158 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3159 p->return_oop()); 3160 } 3161 return NULL; 3162} 3163 3164void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3165 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3166 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3167 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3168 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3169 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3170 3171 if (has_method_handle_invokes()) 3172 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3173 3174 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3175 3176 if (block_begin == entry_point()) { 3177 methodHandle m = method(); 3178 if (m.not_null()) { 3179 stream->print(" # "); 3180 m->print_value_on(stream); 3181 stream->cr(); 3182 } 3183 if (m.not_null() && !is_osr_method()) { 3184 ResourceMark rm; 3185 int sizeargs = m->size_of_parameters(); 3186 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3187 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3188 { 3189 int sig_index = 0; 3190 if (!m->is_static()) 3191 sig_bt[sig_index++] = T_OBJECT; // 'this' 3192 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3193 BasicType t = ss.type(); 3194 sig_bt[sig_index++] = t; 3195 if (type2size[t] == 2) { 3196 sig_bt[sig_index++] = T_VOID; 3197 } else { 3198 assert(type2size[t] == 1, "size is 1 or 2"); 3199 } 3200 } 3201 assert(sig_index == sizeargs, ""); 3202 } 3203 const char* spname = "sp"; // make arch-specific? 3204 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3205 int stack_slot_offset = this->frame_size() * wordSize; 3206 int tab1 = 14, tab2 = 24; 3207 int sig_index = 0; 3208 int arg_index = (m->is_static() ? 0 : -1); 3209 bool did_old_sp = false; 3210 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3211 bool at_this = (arg_index == -1); 3212 bool at_old_sp = false; 3213 BasicType t = (at_this ? T_OBJECT : ss.type()); 3214 assert(t == sig_bt[sig_index], "sigs in sync"); 3215 if (at_this) 3216 stream->print(" # this: "); 3217 else 3218 stream->print(" # parm%d: ", arg_index); 3219 stream->move_to(tab1); 3220 VMReg fst = regs[sig_index].first(); 3221 VMReg snd = regs[sig_index].second(); 3222 if (fst->is_reg()) { 3223 stream->print("%s", fst->name()); 3224 if (snd->is_valid()) { 3225 stream->print(":%s", snd->name()); 3226 } 3227 } else if (fst->is_stack()) { 3228 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3229 if (offset == stack_slot_offset) at_old_sp = true; 3230 stream->print("[%s+0x%x]", spname, offset); 3231 } else { 3232 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3233 } 3234 stream->print(" "); 3235 stream->move_to(tab2); 3236 stream->print("= "); 3237 if (at_this) { 3238 m->method_holder()->print_value_on(stream); 3239 } else { 3240 bool did_name = false; 3241 if (!at_this && ss.is_object()) { 3242 Symbol* name = ss.as_symbol_or_null(); 3243 if (name != NULL) { 3244 name->print_value_on(stream); 3245 did_name = true; 3246 } 3247 } 3248 if (!did_name) 3249 stream->print("%s", type2name(t)); 3250 } 3251 if (at_old_sp) { 3252 stream->print(" (%s of caller)", spname); 3253 did_old_sp = true; 3254 } 3255 stream->cr(); 3256 sig_index += type2size[t]; 3257 arg_index += 1; 3258 if (!at_this) ss.next(); 3259 } 3260 if (!did_old_sp) { 3261 stream->print(" # "); 3262 stream->move_to(tab1); 3263 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3264 stream->print(" (%s of caller)", spname); 3265 stream->cr(); 3266 } 3267 } 3268 } 3269} 3270 3271void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3272 // First, find an oopmap in (begin, end]. 3273 // We use the odd half-closed interval so that oop maps and scope descs 3274 // which are tied to the byte after a call are printed with the call itself. 3275 address base = code_begin(); 3276 ImmutableOopMapSet* oms = oop_maps(); 3277 if (oms != NULL) { 3278 for (int i = 0, imax = oms->count(); i < imax; i++) { 3279 const ImmutableOopMapPair* pair = oms->pair_at(i); 3280 const ImmutableOopMap* om = pair->get_from(oms); 3281 address pc = base + pair->pc_offset(); 3282 if (pc > begin) { 3283 if (pc <= end) { 3284 st->move_to(column); 3285 st->print("; "); 3286 om->print_on(st); 3287 } 3288 break; 3289 } 3290 } 3291 } 3292 3293 // Print any debug info present at this pc. 3294 ScopeDesc* sd = scope_desc_in(begin, end); 3295 if (sd != NULL) { 3296 st->move_to(column); 3297 if (sd->bci() == SynchronizationEntryBCI) { 3298 st->print(";*synchronization entry"); 3299 } else { 3300 if (sd->method() == NULL) { 3301 st->print("method is NULL"); 3302 } else if (sd->method()->is_native()) { 3303 st->print("method is native"); 3304 } else { 3305 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3306 st->print(";*%s", Bytecodes::name(bc)); 3307 switch (bc) { 3308 case Bytecodes::_invokevirtual: 3309 case Bytecodes::_invokespecial: 3310 case Bytecodes::_invokestatic: 3311 case Bytecodes::_invokeinterface: 3312 { 3313 Bytecode_invoke invoke(sd->method(), sd->bci()); 3314 st->print(" "); 3315 if (invoke.name() != NULL) 3316 invoke.name()->print_symbol_on(st); 3317 else 3318 st->print("<UNKNOWN>"); 3319 break; 3320 } 3321 case Bytecodes::_getfield: 3322 case Bytecodes::_putfield: 3323 case Bytecodes::_getstatic: 3324 case Bytecodes::_putstatic: 3325 { 3326 Bytecode_field field(sd->method(), sd->bci()); 3327 st->print(" "); 3328 if (field.name() != NULL) 3329 field.name()->print_symbol_on(st); 3330 else 3331 st->print("<UNKNOWN>"); 3332 } 3333 } 3334 } 3335 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3336 } 3337 3338 // Print all scopes 3339 for (;sd != NULL; sd = sd->sender()) { 3340 st->move_to(column); 3341 st->print("; -"); 3342 if (sd->method() == NULL) { 3343 st->print("method is NULL"); 3344 } else { 3345 sd->method()->print_short_name(st); 3346 } 3347 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3348 if (lineno != -1) { 3349 st->print("@%d (line %d)", sd->bci(), lineno); 3350 } else { 3351 st->print("@%d", sd->bci()); 3352 } 3353 st->cr(); 3354 } 3355 } 3356 3357 // Print relocation information 3358 const char* str = reloc_string_for(begin, end); 3359 if (str != NULL) { 3360 if (sd != NULL) st->cr(); 3361 st->move_to(column); 3362 st->print("; {%s}", str); 3363 } 3364 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3365 if (cont_offset != 0) { 3366 st->move_to(column); 3367 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3368 } 3369 3370} 3371 3372#ifndef PRODUCT 3373 3374void nmethod::print_value_on(outputStream* st) const { 3375 st->print("nmethod"); 3376 print_on(st, NULL); 3377} 3378 3379void nmethod::print_calls(outputStream* st) { 3380 RelocIterator iter(this); 3381 while (iter.next()) { 3382 switch (iter.type()) { 3383 case relocInfo::virtual_call_type: 3384 case relocInfo::opt_virtual_call_type: { 3385 VerifyMutexLocker mc(CompiledIC_lock); 3386 CompiledIC_at(&iter)->print(); 3387 break; 3388 } 3389 case relocInfo::static_call_type: 3390 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3391 compiledStaticCall_at(iter.reloc())->print(); 3392 break; 3393 } 3394 } 3395} 3396 3397void nmethod::print_handler_table() { 3398 ExceptionHandlerTable(this).print(); 3399} 3400 3401void nmethod::print_nul_chk_table() { 3402 ImplicitExceptionTable(this).print(code_begin()); 3403} 3404 3405void nmethod::print_statistics() { 3406 ttyLocker ttyl; 3407 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3408 native_nmethod_stats.print_native_nmethod_stats(); 3409#ifdef COMPILER1 3410 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3411#endif 3412#ifdef COMPILER2 3413 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3414#endif 3415#if INCLUDE_JVMCI 3416 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3417#endif 3418#ifdef SHARK 3419 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 3420#endif 3421 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3422 DebugInformationRecorder::print_statistics(); 3423#ifndef PRODUCT 3424 pc_nmethod_stats.print_pc_stats(); 3425#endif 3426 Dependencies::print_statistics(); 3427 if (xtty != NULL) xtty->tail("statistics"); 3428} 3429 3430#endif // !PRODUCT 3431 3432#if INCLUDE_JVMCI 3433void nmethod::clear_jvmci_installed_code() { 3434 // write_ref_method_pre/post can only be safely called at a 3435 // safepoint or while holding the CodeCache_lock 3436 assert(CodeCache_lock->is_locked() || 3437 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 3438 if (_jvmci_installed_code != NULL) { 3439 // This must be done carefully to maintain nmethod remembered sets properly 3440 BarrierSet* bs = Universe::heap()->barrier_set(); 3441 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 3442 _jvmci_installed_code = NULL; 3443 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 3444 } 3445} 3446 3447void nmethod::maybe_invalidate_installed_code() { 3448 assert(Patching_lock->is_locked() || 3449 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 3450 oop installed_code = jvmci_installed_code(); 3451 if (installed_code != NULL) { 3452 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 3453 if (nm == NULL || nm != this) { 3454 // The link has been broken or the InstalledCode instance is 3455 // associated with another nmethod so do nothing. 3456 return; 3457 } 3458 if (!is_alive()) { 3459 // Break the link between nmethod and InstalledCode such that the nmethod 3460 // can subsequently be flushed safely. The link must be maintained while 3461 // the method could have live activations since invalidateInstalledCode 3462 // might want to invalidate all existing activations. 3463 InstalledCode::set_address(installed_code, 0); 3464 InstalledCode::set_entryPoint(installed_code, 0); 3465 } else if (is_not_entrant()) { 3466 // Remove the entry point so any invocation will fail but keep 3467 // the address link around that so that existing activations can 3468 // be invalidated. 3469 InstalledCode::set_entryPoint(installed_code, 0); 3470 } 3471 } 3472} 3473 3474void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 3475 if (installedCode() == NULL) { 3476 THROW(vmSymbols::java_lang_NullPointerException()); 3477 } 3478 jlong nativeMethod = InstalledCode::address(installedCode); 3479 nmethod* nm = (nmethod*)nativeMethod; 3480 if (nm == NULL) { 3481 // Nothing to do 3482 return; 3483 } 3484 3485 nmethodLocker nml(nm); 3486#ifdef ASSERT 3487 { 3488 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 3489 // This relationship can only be checked safely under a lock 3490 assert(nm == NULL || !nm->is_alive() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 3491 } 3492#endif 3493 3494 if (nm->is_alive()) { 3495 // The nmethod state machinery maintains the link between the 3496 // HotSpotInstalledCode and nmethod* so as long as the nmethod appears to be 3497 // alive assume there is work to do and deoptimize the nmethod. 3498 nm->mark_for_deoptimization(); 3499 VM_Deoptimize op; 3500 VMThread::execute(&op); 3501 } 3502 3503 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 3504 // Check that it's still associated with the same nmethod and break 3505 // the link if it is. 3506 if (InstalledCode::address(installedCode) == nativeMethod) { 3507 InstalledCode::set_address(installedCode, 0); 3508 } 3509} 3510 3511char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 3512 if (!this->is_compiled_by_jvmci()) { 3513 return NULL; 3514 } 3515 oop installedCode = this->jvmci_installed_code(); 3516 if (installedCode != NULL) { 3517 oop installedCodeName = NULL; 3518 if (installedCode->is_a(InstalledCode::klass())) { 3519 installedCodeName = InstalledCode::name(installedCode); 3520 } 3521 if (installedCodeName != NULL) { 3522 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3523 } else { 3524 jio_snprintf(buf, buflen, "null"); 3525 return buf; 3526 } 3527 } 3528 jio_snprintf(buf, buflen, "noInstalledCode"); 3529 return buf; 3530} 3531#endif 3532 3533Method* nmethod::attached_method(address call_instr) { 3534 assert(code_contains(call_instr), "not part of the nmethod"); 3535 RelocIterator iter(this, call_instr, call_instr + 1); 3536 while (iter.next()) { 3537 if (iter.addr() == call_instr) { 3538 switch(iter.type()) { 3539 case relocInfo::static_call_type: return iter.static_call_reloc()->method_value(); 3540 case relocInfo::opt_virtual_call_type: return iter.opt_virtual_call_reloc()->method_value(); 3541 case relocInfo::virtual_call_type: return iter.virtual_call_reloc()->method_value(); 3542 } 3543 } 3544 } 3545 return NULL; // not found 3546} 3547 3548Method* nmethod::attached_method_before_pc(address pc) { 3549 if (NativeCall::is_call_before(pc)) { 3550 NativeCall* ncall = nativeCall_before(pc); 3551 return attached_method(ncall->instruction_address()); 3552 } 3553 return NULL; // not a call 3554} 3555 3556