nmethod.cpp revision 9287:40bd4478a362
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(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(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#ifdef _MSC_VER 678#pragma warning(push) 679#pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list 680#endif 681// For native wrappers 682nmethod::nmethod( 683 Method* method, 684 int nmethod_size, 685 int compile_id, 686 CodeOffsets* offsets, 687 CodeBuffer* code_buffer, 688 int frame_size, 689 ByteSize basic_lock_owner_sp_offset, 690 ByteSize basic_lock_sp_offset, 691 OopMapSet* oop_maps ) 692 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 693 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 694 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 695 _native_basic_lock_sp_offset(basic_lock_sp_offset) 696{ 697 { 698 debug_only(No_Safepoint_Verifier nsv;) 699 assert_locked_or_safepoint(CodeCache_lock); 700 701 init_defaults(); 702 _method = method; 703 _entry_bci = InvocationEntryBci; 704 // We have no exception handler or deopt handler make the 705 // values something that will never match a pc like the nmethod vtable entry 706 _exception_offset = 0; 707 _deoptimize_offset = 0; 708 _deoptimize_mh_offset = 0; 709 _orig_pc_offset = 0; 710 711 _consts_offset = data_offset(); 712 _stub_offset = data_offset(); 713 _oops_offset = data_offset(); 714 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 715 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 716 _scopes_pcs_offset = _scopes_data_offset; 717 _dependencies_offset = _scopes_pcs_offset; 718 _handler_table_offset = _dependencies_offset; 719 _nul_chk_table_offset = _handler_table_offset; 720 _nmethod_end_offset = _nul_chk_table_offset; 721 _compile_id = compile_id; 722 _comp_level = CompLevel_none; 723 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 724 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 725 _osr_entry_point = NULL; 726 _exception_cache = NULL; 727 _pc_desc_cache.reset_to(NULL); 728 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 729 730 code_buffer->copy_values_to(this); 731 if (ScavengeRootsInCode) { 732 if (detect_scavenge_root_oops()) { 733 CodeCache::add_scavenge_root_nmethod(this); 734 } 735 Universe::heap()->register_nmethod(this); 736 } 737 debug_only(verify_scavenge_root_oops()); 738 CodeCache::commit(this); 739 } 740 741 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 742 ttyLocker ttyl; // keep the following output all in one block 743 // This output goes directly to the tty, not the compiler log. 744 // To enable tools to match it up with the compilation activity, 745 // be sure to tag this tty output with the compile ID. 746 if (xtty != NULL) { 747 xtty->begin_head("print_native_nmethod"); 748 xtty->method(_method); 749 xtty->stamp(); 750 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 751 } 752 // print the header part first 753 print(); 754 // then print the requested information 755 if (PrintNativeNMethods) { 756 print_code(); 757 if (oop_maps != NULL) { 758 oop_maps->print(); 759 } 760 } 761 if (PrintRelocations) { 762 print_relocations(); 763 } 764 if (xtty != NULL) { 765 xtty->tail("print_native_nmethod"); 766 } 767 } 768} 769 770#ifdef _MSC_VER 771#pragma warning(pop) 772#endif 773 774void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 775 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 776} 777 778nmethod::nmethod( 779 Method* method, 780 int nmethod_size, 781 int compile_id, 782 int entry_bci, 783 CodeOffsets* offsets, 784 int orig_pc_offset, 785 DebugInformationRecorder* debug_info, 786 Dependencies* dependencies, 787 CodeBuffer *code_buffer, 788 int frame_size, 789 OopMapSet* oop_maps, 790 ExceptionHandlerTable* handler_table, 791 ImplicitExceptionTable* nul_chk_table, 792 AbstractCompiler* compiler, 793 int comp_level 794#if INCLUDE_JVMCI 795 , Handle installed_code, 796 Handle speculation_log 797#endif 798 ) 799 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 800 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 801 _native_receiver_sp_offset(in_ByteSize(-1)), 802 _native_basic_lock_sp_offset(in_ByteSize(-1)) 803{ 804 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 805 { 806 debug_only(No_Safepoint_Verifier nsv;) 807 assert_locked_or_safepoint(CodeCache_lock); 808 809 init_defaults(); 810 _method = method; 811 _entry_bci = entry_bci; 812 _compile_id = compile_id; 813 _comp_level = comp_level; 814 _compiler = compiler; 815 _orig_pc_offset = orig_pc_offset; 816 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 817 818 // Section offsets 819 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 820 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 821 822#if INCLUDE_JVMCI 823 _jvmci_installed_code = installed_code(); 824 _speculation_log = (instanceOop)speculation_log(); 825 826 if (compiler->is_jvmci()) { 827 // JVMCI might not produce any stub sections 828 if (offsets->value(CodeOffsets::Exceptions) != -1) { 829 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 830 } else { 831 _exception_offset = -1; 832 } 833 if (offsets->value(CodeOffsets::Deopt) != -1) { 834 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 835 } else { 836 _deoptimize_offset = -1; 837 } 838 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 839 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 840 } else { 841 _deoptimize_mh_offset = -1; 842 } 843 } else { 844#endif 845 // Exception handler and deopt handler are in the stub section 846 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 847 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 848 849 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 850 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 851 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 852 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 853 } else { 854 _deoptimize_mh_offset = -1; 855#if INCLUDE_JVMCI 856 } 857#endif 858 } 859 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 860 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 861 } else { 862 _unwind_handler_offset = -1; 863 } 864 865 _oops_offset = data_offset(); 866 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 867 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 868 869 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 870 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 871 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 872 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 873 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 874 875 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 876 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 877 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 878 _exception_cache = NULL; 879 _pc_desc_cache.reset_to(scopes_pcs_begin()); 880 881 // Copy contents of ScopeDescRecorder to nmethod 882 code_buffer->copy_values_to(this); 883 debug_info->copy_to(this); 884 dependencies->copy_to(this); 885 if (ScavengeRootsInCode) { 886 if (detect_scavenge_root_oops()) { 887 CodeCache::add_scavenge_root_nmethod(this); 888 } 889 Universe::heap()->register_nmethod(this); 890 } 891 debug_only(verify_scavenge_root_oops()); 892 893 CodeCache::commit(this); 894 895 // Copy contents of ExceptionHandlerTable to nmethod 896 handler_table->copy_to(this); 897 nul_chk_table->copy_to(this); 898 899 // we use the information of entry points to find out if a method is 900 // static or non static 901 assert(compiler->is_c2() || compiler->is_jvmci() || 902 _method->is_static() == (entry_point() == _verified_entry_point), 903 " entry points must be same for static methods and vice versa"); 904 } 905} 906 907// Print a short set of xml attributes to identify this nmethod. The 908// output should be embedded in some other element. 909void nmethod::log_identity(xmlStream* log) const { 910 log->print(" compile_id='%d'", compile_id()); 911 const char* nm_kind = compile_kind(); 912 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 913 if (compiler() != NULL) { 914 log->print(" compiler='%s'", compiler()->name()); 915 } 916 if (TieredCompilation) { 917 log->print(" level='%d'", comp_level()); 918 } 919} 920 921 922#define LOG_OFFSET(log, name) \ 923 if (p2i(name##_end()) - p2i(name##_begin())) \ 924 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 925 p2i(name##_begin()) - p2i(this)) 926 927 928void nmethod::log_new_nmethod() const { 929 if (LogCompilation && xtty != NULL) { 930 ttyLocker ttyl; 931 HandleMark hm; 932 xtty->begin_elem("nmethod"); 933 log_identity(xtty); 934 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 935 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 936 937 LOG_OFFSET(xtty, relocation); 938 LOG_OFFSET(xtty, consts); 939 LOG_OFFSET(xtty, insts); 940 LOG_OFFSET(xtty, stub); 941 LOG_OFFSET(xtty, scopes_data); 942 LOG_OFFSET(xtty, scopes_pcs); 943 LOG_OFFSET(xtty, dependencies); 944 LOG_OFFSET(xtty, handler_table); 945 LOG_OFFSET(xtty, nul_chk_table); 946 LOG_OFFSET(xtty, oops); 947 LOG_OFFSET(xtty, metadata); 948 949 xtty->method(method()); 950 xtty->stamp(); 951 xtty->end_elem(); 952 } 953} 954 955#undef LOG_OFFSET 956 957 958// Print out more verbose output usually for a newly created nmethod. 959void nmethod::print_on(outputStream* st, const char* msg) const { 960 if (st != NULL) { 961 ttyLocker ttyl; 962 if (WizardMode) { 963 CompileTask::print(st, this, msg, /*short_form:*/ true); 964 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 965 } else { 966 CompileTask::print(st, this, msg, /*short_form:*/ false); 967 } 968 } 969} 970 971 972void nmethod::print_nmethod(bool printmethod) { 973 ttyLocker ttyl; // keep the following output all in one block 974 if (xtty != NULL) { 975 xtty->begin_head("print_nmethod"); 976 xtty->stamp(); 977 xtty->end_head(); 978 } 979 // print the header part first 980 print(); 981 // then print the requested information 982 if (printmethod) { 983 print_code(); 984 print_pcs(); 985 if (oop_maps()) { 986 oop_maps()->print(); 987 } 988 } 989 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 990 print_scopes(); 991 } 992 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 993 print_relocations(); 994 } 995 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 996 print_dependencies(); 997 } 998 if (PrintExceptionHandlers) { 999 print_handler_table(); 1000 print_nul_chk_table(); 1001 } 1002 if (xtty != NULL) { 1003 xtty->tail("print_nmethod"); 1004 } 1005} 1006 1007 1008// Promote one word from an assembly-time handle to a live embedded oop. 1009inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1010 if (handle == NULL || 1011 // As a special case, IC oops are initialized to 1 or -1. 1012 handle == (jobject) Universe::non_oop_word()) { 1013 (*dest) = (oop) handle; 1014 } else { 1015 (*dest) = JNIHandles::resolve_non_null(handle); 1016 } 1017} 1018 1019 1020// Have to have the same name because it's called by a template 1021void nmethod::copy_values(GrowableArray<jobject>* array) { 1022 int length = array->length(); 1023 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1024 oop* dest = oops_begin(); 1025 for (int index = 0 ; index < length; index++) { 1026 initialize_immediate_oop(&dest[index], array->at(index)); 1027 } 1028 1029 // Now we can fix up all the oops in the code. We need to do this 1030 // in the code because the assembler uses jobjects as placeholders. 1031 // The code and relocations have already been initialized by the 1032 // CodeBlob constructor, so it is valid even at this early point to 1033 // iterate over relocations and patch the code. 1034 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1035} 1036 1037void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1038 int length = array->length(); 1039 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1040 Metadata** dest = metadata_begin(); 1041 for (int index = 0 ; index < length; index++) { 1042 dest[index] = array->at(index); 1043 } 1044} 1045 1046bool nmethod::is_at_poll_return(address pc) { 1047 RelocIterator iter(this, pc, pc+1); 1048 while (iter.next()) { 1049 if (iter.type() == relocInfo::poll_return_type) 1050 return true; 1051 } 1052 return false; 1053} 1054 1055 1056bool nmethod::is_at_poll_or_poll_return(address pc) { 1057 RelocIterator iter(this, pc, pc+1); 1058 while (iter.next()) { 1059 relocInfo::relocType t = iter.type(); 1060 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1061 return true; 1062 } 1063 return false; 1064} 1065 1066 1067void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1068 // re-patch all oop-bearing instructions, just in case some oops moved 1069 RelocIterator iter(this, begin, end); 1070 while (iter.next()) { 1071 if (iter.type() == relocInfo::oop_type) { 1072 oop_Relocation* reloc = iter.oop_reloc(); 1073 if (initialize_immediates && reloc->oop_is_immediate()) { 1074 oop* dest = reloc->oop_addr(); 1075 initialize_immediate_oop(dest, (jobject) *dest); 1076 } 1077 // Refresh the oop-related bits of this instruction. 1078 reloc->fix_oop_relocation(); 1079 } else if (iter.type() == relocInfo::metadata_type) { 1080 metadata_Relocation* reloc = iter.metadata_reloc(); 1081 reloc->fix_metadata_relocation(); 1082 } 1083 } 1084} 1085 1086 1087void nmethod::verify_oop_relocations() { 1088 // Ensure sure that the code matches the current oop values 1089 RelocIterator iter(this, NULL, NULL); 1090 while (iter.next()) { 1091 if (iter.type() == relocInfo::oop_type) { 1092 oop_Relocation* reloc = iter.oop_reloc(); 1093 if (!reloc->oop_is_immediate()) { 1094 reloc->verify_oop_relocation(); 1095 } 1096 } 1097 } 1098} 1099 1100 1101ScopeDesc* nmethod::scope_desc_at(address pc) { 1102 PcDesc* pd = pc_desc_at(pc); 1103 guarantee(pd != NULL, "scope must be present"); 1104 return new ScopeDesc(this, pd->scope_decode_offset(), 1105 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 1106 pd->return_oop()); 1107} 1108 1109 1110void nmethod::clear_inline_caches() { 1111 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1112 if (is_zombie()) { 1113 return; 1114 } 1115 1116 RelocIterator iter(this); 1117 while (iter.next()) { 1118 iter.reloc()->clear_inline_cache(); 1119 } 1120} 1121 1122// Clear ICStubs of all compiled ICs 1123void nmethod::clear_ic_stubs() { 1124 assert_locked_or_safepoint(CompiledIC_lock); 1125 RelocIterator iter(this); 1126 while(iter.next()) { 1127 if (iter.type() == relocInfo::virtual_call_type) { 1128 CompiledIC* ic = CompiledIC_at(&iter); 1129 ic->clear_ic_stub(); 1130 } 1131 } 1132} 1133 1134 1135void nmethod::cleanup_inline_caches() { 1136 assert_locked_or_safepoint(CompiledIC_lock); 1137 1138 // If the method is not entrant or zombie then a JMP is plastered over the 1139 // first few bytes. If an oop in the old code was there, that oop 1140 // should not get GC'd. Skip the first few bytes of oops on 1141 // not-entrant methods. 1142 address low_boundary = verified_entry_point(); 1143 if (!is_in_use()) { 1144 low_boundary += NativeJump::instruction_size; 1145 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1146 // This means that the low_boundary is going to be a little too high. 1147 // This shouldn't matter, since oops of non-entrant methods are never used. 1148 // In fact, why are we bothering to look at oops in a non-entrant method?? 1149 } 1150 1151 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1152 // zombie and unloaded nmethods. 1153 ResourceMark rm; 1154 RelocIterator iter(this, low_boundary); 1155 while(iter.next()) { 1156 switch(iter.type()) { 1157 case relocInfo::virtual_call_type: 1158 case relocInfo::opt_virtual_call_type: { 1159 CompiledIC *ic = CompiledIC_at(&iter); 1160 // Ok, to lookup references to zombies here 1161 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1162 if( cb != NULL && cb->is_nmethod() ) { 1163 nmethod* nm = (nmethod*)cb; 1164 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1165 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1166 } 1167 break; 1168 } 1169 case relocInfo::static_call_type: { 1170 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1171 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1172 if( cb != NULL && cb->is_nmethod() ) { 1173 nmethod* nm = (nmethod*)cb; 1174 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1175 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1176 } 1177 break; 1178 } 1179 } 1180 } 1181} 1182 1183void nmethod::verify_clean_inline_caches() { 1184 assert_locked_or_safepoint(CompiledIC_lock); 1185 1186 // If the method is not entrant or zombie then a JMP is plastered over the 1187 // first few bytes. If an oop in the old code was there, that oop 1188 // should not get GC'd. Skip the first few bytes of oops on 1189 // not-entrant methods. 1190 address low_boundary = verified_entry_point(); 1191 if (!is_in_use()) { 1192 low_boundary += NativeJump::instruction_size; 1193 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1194 // This means that the low_boundary is going to be a little too high. 1195 // This shouldn't matter, since oops of non-entrant methods are never used. 1196 // In fact, why are we bothering to look at oops in a non-entrant method?? 1197 } 1198 1199 ResourceMark rm; 1200 RelocIterator iter(this, low_boundary); 1201 while(iter.next()) { 1202 switch(iter.type()) { 1203 case relocInfo::virtual_call_type: 1204 case relocInfo::opt_virtual_call_type: { 1205 CompiledIC *ic = CompiledIC_at(&iter); 1206 // Ok, to lookup references to zombies here 1207 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1208 if( cb != NULL && cb->is_nmethod() ) { 1209 nmethod* nm = (nmethod*)cb; 1210 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1211 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1212 assert(ic->is_clean(), "IC should be clean"); 1213 } 1214 } 1215 break; 1216 } 1217 case relocInfo::static_call_type: { 1218 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1219 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1220 if( cb != NULL && cb->is_nmethod() ) { 1221 nmethod* nm = (nmethod*)cb; 1222 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1223 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1224 assert(csc->is_clean(), "IC should be clean"); 1225 } 1226 } 1227 break; 1228 } 1229 } 1230 } 1231} 1232 1233int nmethod::verify_icholder_relocations() { 1234 int count = 0; 1235 1236 RelocIterator iter(this); 1237 while(iter.next()) { 1238 if (iter.type() == relocInfo::virtual_call_type) { 1239 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1240 CompiledIC *ic = CompiledIC_at(&iter); 1241 if (TraceCompiledIC) { 1242 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1243 ic->print(); 1244 } 1245 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1246 count++; 1247 } 1248 } 1249 } 1250 1251 return count; 1252} 1253 1254// This is a private interface with the sweeper. 1255void nmethod::mark_as_seen_on_stack() { 1256 assert(is_alive(), "Must be an alive method"); 1257 // Set the traversal mark to ensure that the sweeper does 2 1258 // cleaning passes before moving to zombie. 1259 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1260} 1261 1262// Tell if a non-entrant method can be converted to a zombie (i.e., 1263// there are no activations on the stack, not in use by the VM, 1264// and not in use by the ServiceThread) 1265bool nmethod::can_convert_to_zombie() { 1266 assert(is_not_entrant(), "must be a non-entrant method"); 1267 1268 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1269 // count can be greater than the stack traversal count before it hits the 1270 // nmethod for the second time. 1271 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1272 !is_locked_by_vm(); 1273} 1274 1275void nmethod::inc_decompile_count() { 1276 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1277 // Could be gated by ProfileTraps, but do not bother... 1278 Method* m = method(); 1279 if (m == NULL) return; 1280 MethodData* mdo = m->method_data(); 1281 if (mdo == NULL) return; 1282 // There is a benign race here. See comments in methodData.hpp. 1283 mdo->inc_decompile_count(); 1284} 1285 1286void nmethod::increase_unloading_clock() { 1287 _global_unloading_clock++; 1288 if (_global_unloading_clock == 0) { 1289 // _nmethods are allocated with _unloading_clock == 0, 1290 // so 0 is never used as a clock value. 1291 _global_unloading_clock = 1; 1292 } 1293} 1294 1295void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1296 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1297} 1298 1299unsigned char nmethod::unloading_clock() { 1300 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1301} 1302 1303void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1304 1305 post_compiled_method_unload(); 1306 1307 // Since this nmethod is being unloaded, make sure that dependencies 1308 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1309 // indicate that this work is being done during a GC. 1310 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1311 assert(is_alive != NULL, "Should be non-NULL"); 1312 // A non-NULL is_alive closure indicates that this is being called during GC. 1313 flush_dependencies(is_alive); 1314 1315 // Break cycle between nmethod & method 1316 if (TraceClassUnloading && WizardMode) { 1317 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1318 " unloadable], Method*(" INTPTR_FORMAT 1319 "), cause(" INTPTR_FORMAT ")", 1320 p2i(this), p2i(_method), p2i(cause)); 1321 if (!Universe::heap()->is_gc_active()) 1322 cause->klass()->print(); 1323 } 1324 // Unlink the osr method, so we do not look this up again 1325 if (is_osr_method()) { 1326 invalidate_osr_method(); 1327 } 1328 // If _method is already NULL the Method* is about to be unloaded, 1329 // so we don't have to break the cycle. Note that it is possible to 1330 // have the Method* live here, in case we unload the nmethod because 1331 // it is pointing to some oop (other than the Method*) being unloaded. 1332 if (_method != NULL) { 1333 // OSR methods point to the Method*, but the Method* does not 1334 // point back! 1335 if (_method->code() == this) { 1336 _method->clear_code(); // Break a cycle 1337 } 1338 _method = NULL; // Clear the method of this dead nmethod 1339 } 1340 1341 // Make the class unloaded - i.e., change state and notify sweeper 1342 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1343 if (is_in_use()) { 1344 // Transitioning directly from live to unloaded -- so 1345 // we need to force a cache clean-up; remember this 1346 // for later on. 1347 CodeCache::set_needs_cache_clean(true); 1348 } 1349 1350 // Unregister must be done before the state change 1351 Universe::heap()->unregister_nmethod(this); 1352 1353 _state = unloaded; 1354 1355#if INCLUDE_JVMCI 1356 // The method can only be unloaded after the pointer to the installed code 1357 // Java wrapper is no longer alive. Here we need to clear out this weak 1358 // reference to the dead object. Nulling out the reference has to happen 1359 // after the method is unregistered since the original value may be still 1360 // tracked by the rset. 1361 maybe_invalidate_installed_code(); 1362#endif 1363 1364 // Log the unloading. 1365 log_state_change(); 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 // Remove nmethod from method. 1478 // We need to check if both the _code and _from_compiled_code_entry_point 1479 // refer to this nmethod because there is a race in setting these two fields 1480 // in Method* as seen in bugid 4947125. 1481 // If the vep() points to the zombie nmethod, the memory for the nmethod 1482 // could be flushed and the compiler and vtable stubs could still call 1483 // through it. 1484 if (method() != NULL && (method()->code() == this || 1485 method()->from_compiled_entry() == verified_entry_point())) { 1486 HandleMark hm; 1487 method()->clear_code(); 1488 } 1489 } // leave critical region under Patching_lock 1490 1491 // When the nmethod becomes zombie it is no longer alive so the 1492 // dependencies must be flushed. nmethods in the not_entrant 1493 // state will be flushed later when the transition to zombie 1494 // happens or they get unloaded. 1495 if (state == zombie) { 1496 { 1497 // Flushing dependecies must be done before any possible 1498 // safepoint can sneak in, otherwise the oops used by the 1499 // dependency logic could have become stale. 1500 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1501 if (nmethod_needs_unregister) { 1502 Universe::heap()->unregister_nmethod(this); 1503 } 1504 flush_dependencies(NULL); 1505 } 1506 1507 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1508 // event and it hasn't already been reported for this nmethod then 1509 // report it now. The event may have been reported earilier if the GC 1510 // marked it for unloading). JvmtiDeferredEventQueue support means 1511 // we no longer go to a safepoint here. 1512 post_compiled_method_unload(); 1513 1514#ifdef ASSERT 1515 // It's no longer safe to access the oops section since zombie 1516 // nmethods aren't scanned for GC. 1517 _oops_are_stale = true; 1518#endif 1519 // the Method may be reclaimed by class unloading now that the 1520 // nmethod is in zombie state 1521 set_method(NULL); 1522 } else { 1523 assert(state == not_entrant, "other cases may need to be handled differently"); 1524 } 1525 1526 JVMCI_ONLY(maybe_invalidate_installed_code()); 1527 1528 if (TraceCreateZombies) { 1529 ResourceMark m; 1530 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"); 1531 } 1532 1533 NMethodSweeper::report_state_change(this); 1534 return true; 1535} 1536 1537void nmethod::flush() { 1538 // Note that there are no valid oops in the nmethod anymore. 1539 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1540 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1541 1542 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1543 assert_locked_or_safepoint(CodeCache_lock); 1544 1545 // completely deallocate this method 1546 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1547 if (PrintMethodFlushing) { 1548 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1549 "/Free CodeCache:" SIZE_FORMAT "Kb", 1550 _compile_id, p2i(this), CodeCache::nof_blobs(), 1551 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1552 } 1553 1554 // We need to deallocate any ExceptionCache data. 1555 // Note that we do not need to grab the nmethod lock for this, it 1556 // better be thread safe if we're disposing of it! 1557 ExceptionCache* ec = exception_cache(); 1558 set_exception_cache(NULL); 1559 while(ec != NULL) { 1560 ExceptionCache* next = ec->next(); 1561 delete ec; 1562 ec = next; 1563 } 1564 1565 if (on_scavenge_root_list()) { 1566 CodeCache::drop_scavenge_root_nmethod(this); 1567 } 1568 1569#ifdef SHARK 1570 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1571#endif // SHARK 1572 1573 ((CodeBlob*)(this))->flush(); 1574 1575 CodeCache::free(this); 1576} 1577 1578// 1579// Notify all classes this nmethod is dependent on that it is no 1580// longer dependent. This should only be called in two situations. 1581// First, when a nmethod transitions to a zombie all dependents need 1582// to be clear. Since zombification happens at a safepoint there's no 1583// synchronization issues. The second place is a little more tricky. 1584// During phase 1 of mark sweep class unloading may happen and as a 1585// result some nmethods may get unloaded. In this case the flushing 1586// of dependencies must happen during phase 1 since after GC any 1587// dependencies in the unloaded nmethod won't be updated, so 1588// traversing the dependency information in unsafe. In that case this 1589// function is called with a non-NULL argument and this function only 1590// notifies instanceKlasses that are reachable 1591 1592void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1593 assert_locked_or_safepoint(CodeCache_lock); 1594 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1595 "is_alive is non-NULL if and only if we are called during GC"); 1596 if (!has_flushed_dependencies()) { 1597 set_has_flushed_dependencies(); 1598 for (Dependencies::DepStream deps(this); deps.next(); ) { 1599 if (deps.type() == Dependencies::call_site_target_value) { 1600 // CallSite dependencies are managed on per-CallSite instance basis. 1601 oop call_site = deps.argument_oop(0); 1602 MethodHandles::remove_dependent_nmethod(call_site, this); 1603 } else { 1604 Klass* klass = deps.context_type(); 1605 if (klass == NULL) { 1606 continue; // ignore things like evol_method 1607 } 1608 // During GC the is_alive closure is non-NULL, and is used to 1609 // determine liveness of dependees that need to be updated. 1610 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1611 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1612 } 1613 } 1614 } 1615 } 1616} 1617 1618 1619// If this oop is not live, the nmethod can be unloaded. 1620bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1621 assert(root != NULL, "just checking"); 1622 oop obj = *root; 1623 if (obj == NULL || is_alive->do_object_b(obj)) { 1624 return false; 1625 } 1626 1627 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1628 // simply because one of its constant oops has gone dead. 1629 // No actual classes need to be unloaded in order for this to occur. 1630 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1631 make_unloaded(is_alive, obj); 1632 return true; 1633} 1634 1635// ------------------------------------------------------------------ 1636// post_compiled_method_load_event 1637// new method for install_code() path 1638// Transfer information from compilation to jvmti 1639void nmethod::post_compiled_method_load_event() { 1640 1641 Method* moop = method(); 1642 HOTSPOT_COMPILED_METHOD_LOAD( 1643 (char *) moop->klass_name()->bytes(), 1644 moop->klass_name()->utf8_length(), 1645 (char *) moop->name()->bytes(), 1646 moop->name()->utf8_length(), 1647 (char *) moop->signature()->bytes(), 1648 moop->signature()->utf8_length(), 1649 insts_begin(), insts_size()); 1650 1651 if (JvmtiExport::should_post_compiled_method_load() || 1652 JvmtiExport::should_post_compiled_method_unload()) { 1653 get_and_cache_jmethod_id(); 1654 } 1655 1656 if (JvmtiExport::should_post_compiled_method_load()) { 1657 // Let the Service thread (which is a real Java thread) post the event 1658 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1659 JvmtiDeferredEventQueue::enqueue( 1660 JvmtiDeferredEvent::compiled_method_load_event(this)); 1661 } 1662} 1663 1664jmethodID nmethod::get_and_cache_jmethod_id() { 1665 if (_jmethod_id == NULL) { 1666 // Cache the jmethod_id since it can no longer be looked up once the 1667 // method itself has been marked for unloading. 1668 _jmethod_id = method()->jmethod_id(); 1669 } 1670 return _jmethod_id; 1671} 1672 1673void nmethod::post_compiled_method_unload() { 1674 if (unload_reported()) { 1675 // During unloading we transition to unloaded and then to zombie 1676 // and the unloading is reported during the first transition. 1677 return; 1678 } 1679 1680 assert(_method != NULL && !is_unloaded(), "just checking"); 1681 DTRACE_METHOD_UNLOAD_PROBE(method()); 1682 1683 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1684 // post the event. Sometime later this nmethod will be made a zombie 1685 // by the sweeper but the Method* will not be valid at that point. 1686 // If the _jmethod_id is null then no load event was ever requested 1687 // so don't bother posting the unload. The main reason for this is 1688 // that the jmethodID is a weak reference to the Method* so if 1689 // it's being unloaded there's no way to look it up since the weak 1690 // ref will have been cleared. 1691 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1692 assert(!unload_reported(), "already unloaded"); 1693 JvmtiDeferredEvent event = 1694 JvmtiDeferredEvent::compiled_method_unload_event(this, 1695 _jmethod_id, insts_begin()); 1696 if (SafepointSynchronize::is_at_safepoint()) { 1697 // Don't want to take the queueing lock. Add it as pending and 1698 // it will get enqueued later. 1699 JvmtiDeferredEventQueue::add_pending_event(event); 1700 } else { 1701 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1702 JvmtiDeferredEventQueue::enqueue(event); 1703 } 1704 } 1705 1706 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1707 // any time. As the nmethod is being unloaded now we mark it has 1708 // having the unload event reported - this will ensure that we don't 1709 // attempt to report the event in the unlikely scenario where the 1710 // event is enabled at the time the nmethod is made a zombie. 1711 set_unload_reported(); 1712} 1713 1714void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1715 if (ic->is_icholder_call()) { 1716 // The only exception is compiledICHolder oops which may 1717 // yet be marked below. (We check this further below). 1718 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1719 1720 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1721 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1722 return; 1723 } 1724 } else { 1725 Metadata* ic_oop = ic->cached_metadata(); 1726 if (ic_oop != NULL) { 1727 if (ic_oop->is_klass()) { 1728 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1729 return; 1730 } 1731 } else if (ic_oop->is_method()) { 1732 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1733 return; 1734 } 1735 } else { 1736 ShouldNotReachHere(); 1737 } 1738 } 1739 } 1740 1741 ic->set_to_clean(); 1742} 1743 1744// This is called at the end of the strong tracing/marking phase of a 1745// GC to unload an nmethod if it contains otherwise unreachable 1746// oops. 1747 1748void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1749 // Make sure the oop's ready to receive visitors 1750 assert(!is_zombie() && !is_unloaded(), 1751 "should not call follow on zombie or unloaded nmethod"); 1752 1753 // If the method is not entrant then a JMP is plastered over the 1754 // first few bytes. If an oop in the old code was there, that oop 1755 // should not get GC'd. Skip the first few bytes of oops on 1756 // not-entrant methods. 1757 address low_boundary = verified_entry_point(); 1758 if (is_not_entrant()) { 1759 low_boundary += NativeJump::instruction_size; 1760 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1761 // (See comment above.) 1762 } 1763 1764 // The RedefineClasses() API can cause the class unloading invariant 1765 // to no longer be true. See jvmtiExport.hpp for details. 1766 // Also, leave a debugging breadcrumb in local flag. 1767 if (JvmtiExport::has_redefined_a_class()) { 1768 // This set of the unloading_occurred flag is done before the 1769 // call to post_compiled_method_unload() so that the unloading 1770 // of this nmethod is reported. 1771 unloading_occurred = true; 1772 } 1773 1774 // Exception cache 1775 clean_exception_cache(is_alive); 1776 1777 // If class unloading occurred we first iterate over all inline caches and 1778 // clear ICs where the cached oop is referring to an unloaded klass or method. 1779 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1780 // iteration below. 1781 if (unloading_occurred) { 1782 RelocIterator iter(this, low_boundary); 1783 while(iter.next()) { 1784 if (iter.type() == relocInfo::virtual_call_type) { 1785 CompiledIC *ic = CompiledIC_at(&iter); 1786 clean_ic_if_metadata_is_dead(ic, is_alive); 1787 } 1788 } 1789 } 1790 1791 // Compiled code 1792 { 1793 RelocIterator iter(this, low_boundary); 1794 while (iter.next()) { 1795 if (iter.type() == relocInfo::oop_type) { 1796 oop_Relocation* r = iter.oop_reloc(); 1797 // In this loop, we must only traverse those oops directly embedded in 1798 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1799 assert(1 == (r->oop_is_immediate()) + 1800 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1801 "oop must be found in exactly one place"); 1802 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1803 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1804 return; 1805 } 1806 } 1807 } 1808 } 1809 } 1810 1811 1812 // Scopes 1813 for (oop* p = oops_begin(); p < oops_end(); p++) { 1814 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1815 if (can_unload(is_alive, p, unloading_occurred)) { 1816 return; 1817 } 1818 } 1819 1820#if INCLUDE_JVMCI 1821 // Follow JVMCI method 1822 BarrierSet* bs = Universe::heap()->barrier_set(); 1823 if (_jvmci_installed_code != NULL) { 1824 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1825 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1826 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 1827 _jvmci_installed_code = NULL; 1828 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 1829 } 1830 } else { 1831 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1832 return; 1833 } 1834 } 1835 } 1836 1837 if (_speculation_log != NULL) { 1838 if (!is_alive->do_object_b(_speculation_log)) { 1839 bs->write_ref_nmethod_pre(&_speculation_log, this); 1840 _speculation_log = NULL; 1841 bs->write_ref_nmethod_post(&_speculation_log, this); 1842 } 1843 } 1844#endif 1845 1846 1847 // Ensure that all metadata is still alive 1848 verify_metadata_loaders(low_boundary, is_alive); 1849} 1850 1851template <class CompiledICorStaticCall> 1852static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1853 // Ok, to lookup references to zombies here 1854 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1855 if (cb != NULL && cb->is_nmethod()) { 1856 nmethod* nm = (nmethod*)cb; 1857 1858 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1859 // The nmethod has not been processed yet. 1860 return true; 1861 } 1862 1863 // Clean inline caches pointing to both zombie and not_entrant methods 1864 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1865 ic->set_to_clean(); 1866 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); 1867 } 1868 } 1869 1870 return false; 1871} 1872 1873static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1874 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1875} 1876 1877static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1878 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1879} 1880 1881bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1882 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1883 1884 oop_Relocation* r = iter_at_oop->oop_reloc(); 1885 // Traverse those oops directly embedded in the code. 1886 // Other oops (oop_index>0) are seen as part of scopes_oops. 1887 assert(1 == (r->oop_is_immediate()) + 1888 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1889 "oop must be found in exactly one place"); 1890 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1891 // Unload this nmethod if the oop is dead. 1892 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1893 return true;; 1894 } 1895 } 1896 1897 return false; 1898} 1899 1900 1901bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1902 ResourceMark rm; 1903 1904 // Make sure the oop's ready to receive visitors 1905 assert(!is_zombie() && !is_unloaded(), 1906 "should not call follow on zombie or unloaded nmethod"); 1907 1908 // If the method is not entrant then a JMP is plastered over the 1909 // first few bytes. If an oop in the old code was there, that oop 1910 // should not get GC'd. Skip the first few bytes of oops on 1911 // not-entrant methods. 1912 address low_boundary = verified_entry_point(); 1913 if (is_not_entrant()) { 1914 low_boundary += NativeJump::instruction_size; 1915 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1916 // (See comment above.) 1917 } 1918 1919 // The RedefineClasses() API can cause the class unloading invariant 1920 // to no longer be true. See jvmtiExport.hpp for details. 1921 // Also, leave a debugging breadcrumb in local flag. 1922 if (JvmtiExport::has_redefined_a_class()) { 1923 // This set of the unloading_occurred flag is done before the 1924 // call to post_compiled_method_unload() so that the unloading 1925 // of this nmethod is reported. 1926 unloading_occurred = true; 1927 } 1928 1929#if INCLUDE_JVMCI 1930 // Follow JVMCI method 1931 if (_jvmci_installed_code != NULL) { 1932 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1933 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1934 _jvmci_installed_code = NULL; 1935 } 1936 } else { 1937 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1938 return false; 1939 } 1940 } 1941 } 1942 1943 if (_speculation_log != NULL) { 1944 if (!is_alive->do_object_b(_speculation_log)) { 1945 _speculation_log = NULL; 1946 } 1947 } 1948#endif 1949 1950 // Exception cache 1951 clean_exception_cache(is_alive); 1952 1953 bool is_unloaded = false; 1954 bool postponed = false; 1955 1956 RelocIterator iter(this, low_boundary); 1957 while(iter.next()) { 1958 1959 switch (iter.type()) { 1960 1961 case relocInfo::virtual_call_type: 1962 if (unloading_occurred) { 1963 // If class unloading occurred we first iterate over all inline caches and 1964 // clear ICs where the cached oop is referring to an unloaded klass or method. 1965 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1966 } 1967 1968 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1969 break; 1970 1971 case relocInfo::opt_virtual_call_type: 1972 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1973 break; 1974 1975 case relocInfo::static_call_type: 1976 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1977 break; 1978 1979 case relocInfo::oop_type: 1980 if (!is_unloaded) { 1981 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 1982 } 1983 break; 1984 1985 case relocInfo::metadata_type: 1986 break; // nothing to do. 1987 } 1988 } 1989 1990 if (is_unloaded) { 1991 return postponed; 1992 } 1993 1994 // Scopes 1995 for (oop* p = oops_begin(); p < oops_end(); p++) { 1996 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1997 if (can_unload(is_alive, p, unloading_occurred)) { 1998 is_unloaded = true; 1999 break; 2000 } 2001 } 2002 2003 if (is_unloaded) { 2004 return postponed; 2005 } 2006 2007#if INCLUDE_JVMCI 2008 // Follow JVMCI method 2009 BarrierSet* bs = Universe::heap()->barrier_set(); 2010 if (_jvmci_installed_code != NULL) { 2011 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 2012 if (!is_alive->do_object_b(_jvmci_installed_code)) { 2013 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2014 _jvmci_installed_code = NULL; 2015 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2016 } 2017 } else { 2018 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 2019 is_unloaded = true; 2020 } 2021 } 2022 } 2023 2024 if (_speculation_log != NULL) { 2025 if (!is_alive->do_object_b(_speculation_log)) { 2026 bs->write_ref_nmethod_pre(&_speculation_log, this); 2027 _speculation_log = NULL; 2028 bs->write_ref_nmethod_post(&_speculation_log, this); 2029 } 2030 } 2031#endif 2032 2033 // Ensure that all metadata is still alive 2034 verify_metadata_loaders(low_boundary, is_alive); 2035 2036 return postponed; 2037} 2038 2039void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2040 ResourceMark rm; 2041 2042 // Make sure the oop's ready to receive visitors 2043 assert(!is_zombie(), 2044 "should not call follow on zombie nmethod"); 2045 2046 // If the method is not entrant then a JMP is plastered over the 2047 // first few bytes. If an oop in the old code was there, that oop 2048 // should not get GC'd. Skip the first few bytes of oops on 2049 // not-entrant methods. 2050 address low_boundary = verified_entry_point(); 2051 if (is_not_entrant()) { 2052 low_boundary += NativeJump::instruction_size; 2053 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2054 // (See comment above.) 2055 } 2056 2057 RelocIterator iter(this, low_boundary); 2058 while(iter.next()) { 2059 2060 switch (iter.type()) { 2061 2062 case relocInfo::virtual_call_type: 2063 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2064 break; 2065 2066 case relocInfo::opt_virtual_call_type: 2067 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2068 break; 2069 2070 case relocInfo::static_call_type: 2071 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2072 break; 2073 } 2074 } 2075} 2076 2077#ifdef ASSERT 2078 2079class CheckClass : AllStatic { 2080 static BoolObjectClosure* _is_alive; 2081 2082 // Check class_loader is alive for this bit of metadata. 2083 static void check_class(Metadata* md) { 2084 Klass* klass = NULL; 2085 if (md->is_klass()) { 2086 klass = ((Klass*)md); 2087 } else if (md->is_method()) { 2088 klass = ((Method*)md)->method_holder(); 2089 } else if (md->is_methodData()) { 2090 klass = ((MethodData*)md)->method()->method_holder(); 2091 } else { 2092 md->print(); 2093 ShouldNotReachHere(); 2094 } 2095 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2096 } 2097 public: 2098 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2099 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2100 _is_alive = is_alive; 2101 nm->metadata_do(check_class); 2102 } 2103}; 2104 2105// This is called during a safepoint so can use static data 2106BoolObjectClosure* CheckClass::_is_alive = NULL; 2107#endif // ASSERT 2108 2109 2110// Processing of oop references should have been sufficient to keep 2111// all strong references alive. Any weak references should have been 2112// cleared as well. Visit all the metadata and ensure that it's 2113// really alive. 2114void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2115#ifdef ASSERT 2116 RelocIterator iter(this, low_boundary); 2117 while (iter.next()) { 2118 // static_stub_Relocations may have dangling references to 2119 // Method*s so trim them out here. Otherwise it looks like 2120 // compiled code is maintaining a link to dead metadata. 2121 address static_call_addr = NULL; 2122 if (iter.type() == relocInfo::opt_virtual_call_type) { 2123 CompiledIC* cic = CompiledIC_at(&iter); 2124 if (!cic->is_call_to_interpreted()) { 2125 static_call_addr = iter.addr(); 2126 } 2127 } else if (iter.type() == relocInfo::static_call_type) { 2128 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2129 if (!csc->is_call_to_interpreted()) { 2130 static_call_addr = iter.addr(); 2131 } 2132 } 2133 if (static_call_addr != NULL) { 2134 RelocIterator sciter(this, low_boundary); 2135 while (sciter.next()) { 2136 if (sciter.type() == relocInfo::static_stub_type && 2137 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2138 sciter.static_stub_reloc()->clear_inline_cache(); 2139 } 2140 } 2141 } 2142 } 2143 // Check that the metadata embedded in the nmethod is alive 2144 CheckClass::do_check_class(is_alive, this); 2145#endif 2146} 2147 2148 2149// Iterate over metadata calling this function. Used by RedefineClasses 2150void nmethod::metadata_do(void f(Metadata*)) { 2151 address low_boundary = verified_entry_point(); 2152 if (is_not_entrant()) { 2153 low_boundary += NativeJump::instruction_size; 2154 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2155 // (See comment above.) 2156 } 2157 { 2158 // Visit all immediate references that are embedded in the instruction stream. 2159 RelocIterator iter(this, low_boundary); 2160 while (iter.next()) { 2161 if (iter.type() == relocInfo::metadata_type ) { 2162 metadata_Relocation* r = iter.metadata_reloc(); 2163 // In this metadata, we must only follow those metadatas directly embedded in 2164 // the code. Other metadatas (oop_index>0) are seen as part of 2165 // the metadata section below. 2166 assert(1 == (r->metadata_is_immediate()) + 2167 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2168 "metadata must be found in exactly one place"); 2169 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2170 Metadata* md = r->metadata_value(); 2171 if (md != _method) f(md); 2172 } 2173 } else if (iter.type() == relocInfo::virtual_call_type) { 2174 // Check compiledIC holders associated with this nmethod 2175 CompiledIC *ic = CompiledIC_at(&iter); 2176 if (ic->is_icholder_call()) { 2177 CompiledICHolder* cichk = ic->cached_icholder(); 2178 f(cichk->holder_method()); 2179 f(cichk->holder_klass()); 2180 } else { 2181 Metadata* ic_oop = ic->cached_metadata(); 2182 if (ic_oop != NULL) { 2183 f(ic_oop); 2184 } 2185 } 2186 } 2187 } 2188 } 2189 2190 // Visit the metadata section 2191 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2192 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2193 Metadata* md = *p; 2194 f(md); 2195 } 2196 2197 // Visit metadata not embedded in the other places. 2198 if (_method != NULL) f(_method); 2199} 2200 2201void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2202 // make sure the oops ready to receive visitors 2203 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2204 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2205 2206 // If the method is not entrant or zombie then a JMP is plastered over the 2207 // first few bytes. If an oop in the old code was there, that oop 2208 // should not get GC'd. Skip the first few bytes of oops on 2209 // not-entrant methods. 2210 address low_boundary = verified_entry_point(); 2211 if (is_not_entrant()) { 2212 low_boundary += NativeJump::instruction_size; 2213 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2214 // (See comment above.) 2215 } 2216 2217#if INCLUDE_JVMCI 2218 if (_jvmci_installed_code != NULL) { 2219 f->do_oop((oop*) &_jvmci_installed_code); 2220 } 2221 if (_speculation_log != NULL) { 2222 f->do_oop((oop*) &_speculation_log); 2223 } 2224#endif 2225 2226 RelocIterator iter(this, low_boundary); 2227 2228 while (iter.next()) { 2229 if (iter.type() == relocInfo::oop_type ) { 2230 oop_Relocation* r = iter.oop_reloc(); 2231 // In this loop, we must only follow those oops directly embedded in 2232 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2233 assert(1 == (r->oop_is_immediate()) + 2234 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2235 "oop must be found in exactly one place"); 2236 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2237 f->do_oop(r->oop_addr()); 2238 } 2239 } 2240 } 2241 2242 // Scopes 2243 // This includes oop constants not inlined in the code stream. 2244 for (oop* p = oops_begin(); p < oops_end(); p++) { 2245 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2246 f->do_oop(p); 2247 } 2248} 2249 2250#define NMETHOD_SENTINEL ((nmethod*)badAddress) 2251 2252nmethod* volatile nmethod::_oops_do_mark_nmethods; 2253 2254// An nmethod is "marked" if its _mark_link is set non-null. 2255// Even if it is the end of the linked list, it will have a non-null link value, 2256// as long as it is on the list. 2257// This code must be MP safe, because it is used from parallel GC passes. 2258bool nmethod::test_set_oops_do_mark() { 2259 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2260 nmethod* observed_mark_link = _oops_do_mark_link; 2261 if (observed_mark_link == NULL) { 2262 // Claim this nmethod for this thread to mark. 2263 observed_mark_link = (nmethod*) 2264 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2265 if (observed_mark_link == NULL) { 2266 2267 // Atomically append this nmethod (now claimed) to the head of the list: 2268 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2269 for (;;) { 2270 nmethod* required_mark_nmethods = observed_mark_nmethods; 2271 _oops_do_mark_link = required_mark_nmethods; 2272 observed_mark_nmethods = (nmethod*) 2273 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2274 if (observed_mark_nmethods == required_mark_nmethods) 2275 break; 2276 } 2277 // Mark was clear when we first saw this guy. 2278 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2279 return false; 2280 } 2281 } 2282 // On fall through, another racing thread marked this nmethod before we did. 2283 return true; 2284} 2285 2286void nmethod::oops_do_marking_prologue() { 2287 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2288 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2289 // We use cmpxchg_ptr instead of regular assignment here because the user 2290 // may fork a bunch of threads, and we need them all to see the same state. 2291 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2292 guarantee(observed == NULL, "no races in this sequential code"); 2293} 2294 2295void nmethod::oops_do_marking_epilogue() { 2296 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2297 nmethod* cur = _oops_do_mark_nmethods; 2298 while (cur != NMETHOD_SENTINEL) { 2299 assert(cur != NULL, "not NULL-terminated"); 2300 nmethod* next = cur->_oops_do_mark_link; 2301 cur->_oops_do_mark_link = NULL; 2302 cur->verify_oop_relocations(); 2303 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2304 cur = next; 2305 } 2306 void* required = _oops_do_mark_nmethods; 2307 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2308 guarantee(observed == required, "no races in this sequential code"); 2309 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2310} 2311 2312class DetectScavengeRoot: public OopClosure { 2313 bool _detected_scavenge_root; 2314public: 2315 DetectScavengeRoot() : _detected_scavenge_root(false) 2316 { NOT_PRODUCT(_print_nm = NULL); } 2317 bool detected_scavenge_root() { return _detected_scavenge_root; } 2318 virtual void do_oop(oop* p) { 2319 if ((*p) != NULL && (*p)->is_scavengable()) { 2320 NOT_PRODUCT(maybe_print(p)); 2321 _detected_scavenge_root = true; 2322 } 2323 } 2324 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2325 2326#ifndef PRODUCT 2327 nmethod* _print_nm; 2328 void maybe_print(oop* p) { 2329 if (_print_nm == NULL) return; 2330 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2331 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2332 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 2333 p2i(*p), p2i(p)); 2334 (*p)->print(); 2335 } 2336#endif //PRODUCT 2337}; 2338 2339bool nmethod::detect_scavenge_root_oops() { 2340 DetectScavengeRoot detect_scavenge_root; 2341 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2342 oops_do(&detect_scavenge_root); 2343 return detect_scavenge_root.detected_scavenge_root(); 2344} 2345 2346// Method that knows how to preserve outgoing arguments at call. This method must be 2347// called with a frame corresponding to a Java invoke 2348void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2349#ifndef SHARK 2350 if (method() != NULL && !method()->is_native()) { 2351 SimpleScopeDesc ssd(this, fr.pc()); 2352 Bytecode_invoke call(ssd.method(), ssd.bci()); 2353 bool has_receiver = call.has_receiver(); 2354 bool has_appendix = call.has_appendix(); 2355 Symbol* signature = call.signature(); 2356 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2357 } 2358#endif // !SHARK 2359} 2360 2361inline bool includes(void* p, void* from, void* to) { 2362 return from <= p && p < to; 2363} 2364 2365 2366void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2367 assert(count >= 2, "must be sentinel values, at least"); 2368 2369#ifdef ASSERT 2370 // must be sorted and unique; we do a binary search in find_pc_desc() 2371 int prev_offset = pcs[0].pc_offset(); 2372 assert(prev_offset == PcDesc::lower_offset_limit, 2373 "must start with a sentinel"); 2374 for (int i = 1; i < count; i++) { 2375 int this_offset = pcs[i].pc_offset(); 2376 assert(this_offset > prev_offset, "offsets must be sorted"); 2377 prev_offset = this_offset; 2378 } 2379 assert(prev_offset == PcDesc::upper_offset_limit, 2380 "must end with a sentinel"); 2381#endif //ASSERT 2382 2383 // Search for MethodHandle invokes and tag the nmethod. 2384 for (int i = 0; i < count; i++) { 2385 if (pcs[i].is_method_handle_invoke()) { 2386 set_has_method_handle_invokes(true); 2387 break; 2388 } 2389 } 2390 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2391 2392 int size = count * sizeof(PcDesc); 2393 assert(scopes_pcs_size() >= size, "oob"); 2394 memcpy(scopes_pcs_begin(), pcs, size); 2395 2396 // Adjust the final sentinel downward. 2397 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2398 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2399 last_pc->set_pc_offset(content_size() + 1); 2400 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2401 // Fill any rounding gaps with copies of the last record. 2402 last_pc[1] = last_pc[0]; 2403 } 2404 // The following assert could fail if sizeof(PcDesc) is not 2405 // an integral multiple of oopSize (the rounding term). 2406 // If it fails, change the logic to always allocate a multiple 2407 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2408 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2409} 2410 2411void nmethod::copy_scopes_data(u_char* buffer, int size) { 2412 assert(scopes_data_size() >= size, "oob"); 2413 memcpy(scopes_data_begin(), buffer, size); 2414} 2415 2416// When using JVMCI the address might be off by the size of a call instruction. 2417bool nmethod::is_deopt_entry(address pc) { 2418 return pc == deopt_handler_begin() 2419#if INCLUDE_JVMCI 2420 || pc == (deopt_handler_begin() + NativeCall::instruction_size) 2421#endif 2422 ; 2423} 2424 2425#ifdef ASSERT 2426static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2427 PcDesc* lower = nm->scopes_pcs_begin(); 2428 PcDesc* upper = nm->scopes_pcs_end(); 2429 lower += 1; // exclude initial sentinel 2430 PcDesc* res = NULL; 2431 for (PcDesc* p = lower; p < upper; p++) { 2432 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2433 if (match_desc(p, pc_offset, approximate)) { 2434 if (res == NULL) 2435 res = p; 2436 else 2437 res = (PcDesc*) badAddress; 2438 } 2439 } 2440 return res; 2441} 2442#endif 2443 2444 2445// Finds a PcDesc with real-pc equal to "pc" 2446PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2447 address base_address = code_begin(); 2448 if ((pc < base_address) || 2449 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2450 return NULL; // PC is wildly out of range 2451 } 2452 int pc_offset = (int) (pc - base_address); 2453 2454 // Check the PcDesc cache if it contains the desired PcDesc 2455 // (This as an almost 100% hit rate.) 2456 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2457 if (res != NULL) { 2458 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2459 return res; 2460 } 2461 2462 // Fallback algorithm: quasi-linear search for the PcDesc 2463 // Find the last pc_offset less than the given offset. 2464 // The successor must be the required match, if there is a match at all. 2465 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2466 PcDesc* lower = scopes_pcs_begin(); 2467 PcDesc* upper = scopes_pcs_end(); 2468 upper -= 1; // exclude final sentinel 2469 if (lower >= upper) return NULL; // native method; no PcDescs at all 2470 2471#define assert_LU_OK \ 2472 /* invariant on lower..upper during the following search: */ \ 2473 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2474 assert(upper->pc_offset() >= pc_offset, "sanity") 2475 assert_LU_OK; 2476 2477 // Use the last successful return as a split point. 2478 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2479 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2480 if (mid->pc_offset() < pc_offset) { 2481 lower = mid; 2482 } else { 2483 upper = mid; 2484 } 2485 2486 // Take giant steps at first (4096, then 256, then 16, then 1) 2487 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2488 const int RADIX = (1 << LOG2_RADIX); 2489 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2490 while ((mid = lower + step) < upper) { 2491 assert_LU_OK; 2492 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2493 if (mid->pc_offset() < pc_offset) { 2494 lower = mid; 2495 } else { 2496 upper = mid; 2497 break; 2498 } 2499 } 2500 assert_LU_OK; 2501 } 2502 2503 // Sneak up on the value with a linear search of length ~16. 2504 while (true) { 2505 assert_LU_OK; 2506 mid = lower + 1; 2507 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2508 if (mid->pc_offset() < pc_offset) { 2509 lower = mid; 2510 } else { 2511 upper = mid; 2512 break; 2513 } 2514 } 2515#undef assert_LU_OK 2516 2517 if (match_desc(upper, pc_offset, approximate)) { 2518 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2519 _pc_desc_cache.add_pc_desc(upper); 2520 return upper; 2521 } else { 2522 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2523 return NULL; 2524 } 2525} 2526 2527 2528void nmethod::check_all_dependencies(DepChange& changes) { 2529 // Checked dependencies are allocated into this ResourceMark 2530 ResourceMark rm; 2531 2532 // Turn off dependency tracing while actually testing dependencies. 2533 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2534 2535 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2536 &DependencySignature::equals, 11027> DepTable; 2537 2538 DepTable* table = new DepTable(); 2539 2540 // Iterate over live nmethods and check dependencies of all nmethods that are not 2541 // marked for deoptimization. A particular dependency is only checked once. 2542 NMethodIterator iter; 2543 while(iter.next()) { 2544 nmethod* nm = iter.method(); 2545 // Only notify for live nmethods 2546 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2547 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2548 // Construct abstraction of a dependency. 2549 DependencySignature* current_sig = new DependencySignature(deps); 2550 2551 // Determine if dependency is already checked. table->put(...) returns 2552 // 'true' if the dependency is added (i.e., was not in the hashtable). 2553 if (table->put(*current_sig, 1)) { 2554 if (deps.check_dependency() != NULL) { 2555 // Dependency checking failed. Print out information about the failed 2556 // dependency and finally fail with an assert. We can fail here, since 2557 // dependency checking is never done in a product build. 2558 tty->print_cr("Failed dependency:"); 2559 changes.print(); 2560 nm->print(); 2561 nm->print_dependencies(); 2562 assert(false, "Should have been marked for deoptimization"); 2563 } 2564 } 2565 } 2566 } 2567 } 2568} 2569 2570bool nmethod::check_dependency_on(DepChange& changes) { 2571 // What has happened: 2572 // 1) a new class dependee has been added 2573 // 2) dependee and all its super classes have been marked 2574 bool found_check = false; // set true if we are upset 2575 for (Dependencies::DepStream deps(this); deps.next(); ) { 2576 // Evaluate only relevant dependencies. 2577 if (deps.spot_check_dependency_at(changes) != NULL) { 2578 found_check = true; 2579 NOT_DEBUG(break); 2580 } 2581 } 2582 return found_check; 2583} 2584 2585bool nmethod::is_evol_dependent_on(Klass* dependee) { 2586 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2587 Array<Method*>* dependee_methods = dependee_ik->methods(); 2588 for (Dependencies::DepStream deps(this); deps.next(); ) { 2589 if (deps.type() == Dependencies::evol_method) { 2590 Method* method = deps.method_argument(0); 2591 for (int j = 0; j < dependee_methods->length(); j++) { 2592 if (dependee_methods->at(j) == method) { 2593 // RC_TRACE macro has an embedded ResourceMark 2594 RC_TRACE(0x01000000, 2595 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2596 _method->method_holder()->external_name(), 2597 _method->name()->as_C_string(), 2598 _method->signature()->as_C_string(), compile_id(), 2599 method->method_holder()->external_name(), 2600 method->name()->as_C_string(), 2601 method->signature()->as_C_string())); 2602 if (TraceDependencies || LogCompilation) 2603 deps.log_dependency(dependee); 2604 return true; 2605 } 2606 } 2607 } 2608 } 2609 return false; 2610} 2611 2612// Called from mark_for_deoptimization, when dependee is invalidated. 2613bool nmethod::is_dependent_on_method(Method* dependee) { 2614 for (Dependencies::DepStream deps(this); deps.next(); ) { 2615 if (deps.type() != Dependencies::evol_method) 2616 continue; 2617 Method* method = deps.method_argument(0); 2618 if (method == dependee) return true; 2619 } 2620 return false; 2621} 2622 2623 2624bool nmethod::is_patchable_at(address instr_addr) { 2625 assert(insts_contains(instr_addr), "wrong nmethod used"); 2626 if (is_zombie()) { 2627 // a zombie may never be patched 2628 return false; 2629 } 2630 return true; 2631} 2632 2633 2634address nmethod::continuation_for_implicit_exception(address pc) { 2635 // Exception happened outside inline-cache check code => we are inside 2636 // an active nmethod => use cpc to determine a return address 2637 int exception_offset = pc - code_begin(); 2638 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2639#ifdef ASSERT 2640 if (cont_offset == 0) { 2641 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2642 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2643 HandleMark hm(thread); 2644 ResourceMark rm(thread); 2645 CodeBlob* cb = CodeCache::find_blob(pc); 2646 assert(cb != NULL && cb == this, ""); 2647 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2648 print(); 2649 method()->print_codes(); 2650 print_code(); 2651 print_pcs(); 2652 } 2653#endif 2654 if (cont_offset == 0) { 2655 // Let the normal error handling report the exception 2656 return NULL; 2657 } 2658 return code_begin() + cont_offset; 2659} 2660 2661 2662 2663void nmethod_init() { 2664 // make sure you didn't forget to adjust the filler fields 2665 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2666} 2667 2668 2669//------------------------------------------------------------------------------------------- 2670 2671 2672// QQQ might we make this work from a frame?? 2673nmethodLocker::nmethodLocker(address pc) { 2674 CodeBlob* cb = CodeCache::find_blob(pc); 2675 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2676 _nm = (nmethod*)cb; 2677 lock_nmethod(_nm); 2678} 2679 2680// Only JvmtiDeferredEvent::compiled_method_unload_event() 2681// should pass zombie_ok == true. 2682void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2683 if (nm == NULL) return; 2684 Atomic::inc(&nm->_lock_count); 2685 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2686} 2687 2688void nmethodLocker::unlock_nmethod(nmethod* nm) { 2689 if (nm == NULL) return; 2690 Atomic::dec(&nm->_lock_count); 2691 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2692} 2693 2694// ----------------------------------------------------------------------------- 2695// nmethod::get_deopt_original_pc 2696// 2697// Return the original PC for the given PC if: 2698// (a) the given PC belongs to a nmethod and 2699// (b) it is a deopt PC 2700address nmethod::get_deopt_original_pc(const frame* fr) { 2701 if (fr->cb() == NULL) return NULL; 2702 2703 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2704 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2705 return nm->get_original_pc(fr); 2706 2707 return NULL; 2708} 2709 2710 2711// ----------------------------------------------------------------------------- 2712// MethodHandle 2713 2714bool nmethod::is_method_handle_return(address return_pc) { 2715 if (!has_method_handle_invokes()) return false; 2716 PcDesc* pd = pc_desc_at(return_pc); 2717 if (pd == NULL) 2718 return false; 2719 return pd->is_method_handle_invoke(); 2720} 2721 2722 2723// ----------------------------------------------------------------------------- 2724// Verification 2725 2726class VerifyOopsClosure: public OopClosure { 2727 nmethod* _nm; 2728 bool _ok; 2729public: 2730 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2731 bool ok() { return _ok; } 2732 virtual void do_oop(oop* p) { 2733 if ((*p) == NULL || (*p)->is_oop()) return; 2734 if (_ok) { 2735 _nm->print_nmethod(true); 2736 _ok = false; 2737 } 2738 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2739 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2740 } 2741 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2742}; 2743 2744void nmethod::verify() { 2745 2746 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2747 // seems odd. 2748 2749 if (is_zombie() || is_not_entrant() || is_unloaded()) 2750 return; 2751 2752 // Make sure all the entry points are correctly aligned for patching. 2753 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2754 2755 // assert(method()->is_oop(), "must be valid"); 2756 2757 ResourceMark rm; 2758 2759 if (!CodeCache::contains(this)) { 2760 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2761 } 2762 2763 if(is_native_method() ) 2764 return; 2765 2766 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2767 if (nm != this) { 2768 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2769 } 2770 2771 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2772 if (! p->verify(this)) { 2773 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2774 } 2775 } 2776 2777 VerifyOopsClosure voc(this); 2778 oops_do(&voc); 2779 assert(voc.ok(), "embedded oops must be OK"); 2780 verify_scavenge_root_oops(); 2781 2782 verify_scopes(); 2783} 2784 2785 2786void nmethod::verify_interrupt_point(address call_site) { 2787 // Verify IC only when nmethod installation is finished. 2788 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2789 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2790 if (is_installed) { 2791 Thread *cur = Thread::current(); 2792 if (CompiledIC_lock->owner() == cur || 2793 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2794 SafepointSynchronize::is_at_safepoint())) { 2795 CompiledIC_at(this, call_site); 2796 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2797 } else { 2798 MutexLocker ml_verify (CompiledIC_lock); 2799 CompiledIC_at(this, call_site); 2800 } 2801 } 2802 2803 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2804 assert(pd != NULL, "PcDesc must exist"); 2805 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2806 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2807 pd->return_oop()); 2808 !sd->is_top(); sd = sd->sender()) { 2809 sd->verify(); 2810 } 2811} 2812 2813void nmethod::verify_scopes() { 2814 if( !method() ) return; // Runtime stubs have no scope 2815 if (method()->is_native()) return; // Ignore stub methods. 2816 // iterate through all interrupt point 2817 // and verify the debug information is valid. 2818 RelocIterator iter((nmethod*)this); 2819 while (iter.next()) { 2820 address stub = NULL; 2821 switch (iter.type()) { 2822 case relocInfo::virtual_call_type: 2823 verify_interrupt_point(iter.addr()); 2824 break; 2825 case relocInfo::opt_virtual_call_type: 2826 stub = iter.opt_virtual_call_reloc()->static_stub(); 2827 verify_interrupt_point(iter.addr()); 2828 break; 2829 case relocInfo::static_call_type: 2830 stub = iter.static_call_reloc()->static_stub(); 2831 //verify_interrupt_point(iter.addr()); 2832 break; 2833 case relocInfo::runtime_call_type: 2834 address destination = iter.reloc()->value(); 2835 // Right now there is no way to find out which entries support 2836 // an interrupt point. It would be nice if we had this 2837 // information in a table. 2838 break; 2839 } 2840 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2841 } 2842} 2843 2844 2845// ----------------------------------------------------------------------------- 2846// Non-product code 2847#ifndef PRODUCT 2848 2849class DebugScavengeRoot: public OopClosure { 2850 nmethod* _nm; 2851 bool _ok; 2852public: 2853 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2854 bool ok() { return _ok; } 2855 virtual void do_oop(oop* p) { 2856 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2857 if (_ok) { 2858 _nm->print_nmethod(true); 2859 _ok = false; 2860 } 2861 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2862 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2863 (*p)->print(); 2864 } 2865 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2866}; 2867 2868void nmethod::verify_scavenge_root_oops() { 2869 if (UseG1GC) { 2870 return; 2871 } 2872 2873 if (!on_scavenge_root_list()) { 2874 // Actually look inside, to verify the claim that it's clean. 2875 DebugScavengeRoot debug_scavenge_root(this); 2876 oops_do(&debug_scavenge_root); 2877 if (!debug_scavenge_root.ok()) 2878 fatal("found an unadvertised bad scavengable oop in the code cache"); 2879 } 2880 assert(scavenge_root_not_marked(), ""); 2881} 2882 2883#endif // PRODUCT 2884 2885// Printing operations 2886 2887void nmethod::print() const { 2888 ResourceMark rm; 2889 ttyLocker ttyl; // keep the following output all in one block 2890 2891 tty->print("Compiled method "); 2892 2893 if (is_compiled_by_c1()) { 2894 tty->print("(c1) "); 2895 } else if (is_compiled_by_c2()) { 2896 tty->print("(c2) "); 2897 } else if (is_compiled_by_shark()) { 2898 tty->print("(shark) "); 2899 } else if (is_compiled_by_jvmci()) { 2900 tty->print("(JVMCI) "); 2901 } else { 2902 tty->print("(nm) "); 2903 } 2904 2905 print_on(tty, NULL); 2906 2907 if (WizardMode) { 2908 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2909 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2910 tty->print(" { "); 2911 if (is_in_use()) tty->print("in_use "); 2912 if (is_not_entrant()) tty->print("not_entrant "); 2913 if (is_zombie()) tty->print("zombie "); 2914 if (is_unloaded()) tty->print("unloaded "); 2915 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2916 tty->print_cr("}:"); 2917 } 2918 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2919 p2i(this), 2920 p2i(this) + size(), 2921 size()); 2922 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2923 p2i(relocation_begin()), 2924 p2i(relocation_end()), 2925 relocation_size()); 2926 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2927 p2i(consts_begin()), 2928 p2i(consts_end()), 2929 consts_size()); 2930 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2931 p2i(insts_begin()), 2932 p2i(insts_end()), 2933 insts_size()); 2934 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2935 p2i(stub_begin()), 2936 p2i(stub_end()), 2937 stub_size()); 2938 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2939 p2i(oops_begin()), 2940 p2i(oops_end()), 2941 oops_size()); 2942 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2943 p2i(metadata_begin()), 2944 p2i(metadata_end()), 2945 metadata_size()); 2946 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2947 p2i(scopes_data_begin()), 2948 p2i(scopes_data_end()), 2949 scopes_data_size()); 2950 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2951 p2i(scopes_pcs_begin()), 2952 p2i(scopes_pcs_end()), 2953 scopes_pcs_size()); 2954 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2955 p2i(dependencies_begin()), 2956 p2i(dependencies_end()), 2957 dependencies_size()); 2958 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2959 p2i(handler_table_begin()), 2960 p2i(handler_table_end()), 2961 handler_table_size()); 2962 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2963 p2i(nul_chk_table_begin()), 2964 p2i(nul_chk_table_end()), 2965 nul_chk_table_size()); 2966} 2967 2968void nmethod::print_code() { 2969 HandleMark hm; 2970 ResourceMark m; 2971 Disassembler::decode(this); 2972} 2973 2974 2975#ifndef PRODUCT 2976 2977void nmethod::print_scopes() { 2978 // Find the first pc desc for all scopes in the code and print it. 2979 ResourceMark rm; 2980 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2981 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2982 continue; 2983 2984 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2985 while (sd != NULL) { 2986 sd->print_on(tty, p); 2987 sd = sd->sender(); 2988 } 2989 } 2990} 2991 2992void nmethod::print_dependencies() { 2993 ResourceMark rm; 2994 ttyLocker ttyl; // keep the following output all in one block 2995 tty->print_cr("Dependencies:"); 2996 for (Dependencies::DepStream deps(this); deps.next(); ) { 2997 deps.print_dependency(); 2998 Klass* ctxk = deps.context_type(); 2999 if (ctxk != NULL) { 3000 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 3001 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 3002 } 3003 } 3004 deps.log_dependency(); // put it into the xml log also 3005 } 3006} 3007 3008 3009void nmethod::print_relocations() { 3010 ResourceMark m; // in case methods get printed via the debugger 3011 tty->print_cr("relocations:"); 3012 RelocIterator iter(this); 3013 iter.print(); 3014 if (UseRelocIndex) { 3015 jint* index_end = (jint*)relocation_end() - 1; 3016 jint index_size = *index_end; 3017 jint* index_start = (jint*)( (address)index_end - index_size ); 3018 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 3019 if (index_size > 0) { 3020 jint* ip; 3021 for (ip = index_start; ip+2 <= index_end; ip += 2) 3022 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 3023 ip[0], 3024 ip[1], 3025 p2i(header_end()+ip[0]), 3026 p2i(relocation_begin()-1+ip[1])); 3027 for (; ip < index_end; ip++) 3028 tty->print_cr(" (%d ?)", ip[0]); 3029 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 3030 ip++; 3031 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 3032 } 3033 } 3034} 3035 3036 3037void nmethod::print_pcs() { 3038 ResourceMark m; // in case methods get printed via debugger 3039 tty->print_cr("pc-bytecode offsets:"); 3040 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3041 p->print(this); 3042 } 3043} 3044 3045#endif // PRODUCT 3046 3047const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3048 RelocIterator iter(this, begin, end); 3049 bool have_one = false; 3050 while (iter.next()) { 3051 have_one = true; 3052 switch (iter.type()) { 3053 case relocInfo::none: return "no_reloc"; 3054 case relocInfo::oop_type: { 3055 stringStream st; 3056 oop_Relocation* r = iter.oop_reloc(); 3057 oop obj = r->oop_value(); 3058 st.print("oop("); 3059 if (obj == NULL) st.print("NULL"); 3060 else obj->print_value_on(&st); 3061 st.print(")"); 3062 return st.as_string(); 3063 } 3064 case relocInfo::metadata_type: { 3065 stringStream st; 3066 metadata_Relocation* r = iter.metadata_reloc(); 3067 Metadata* obj = r->metadata_value(); 3068 st.print("metadata("); 3069 if (obj == NULL) st.print("NULL"); 3070 else obj->print_value_on(&st); 3071 st.print(")"); 3072 return st.as_string(); 3073 } 3074 case relocInfo::runtime_call_type: { 3075 stringStream st; 3076 st.print("runtime_call"); 3077 runtime_call_Relocation* r = iter.runtime_call_reloc(); 3078 address dest = r->destination(); 3079 CodeBlob* cb = CodeCache::find_blob(dest); 3080 if (cb != NULL) { 3081 st.print(" %s", cb->name()); 3082 } 3083 return st.as_string(); 3084 } 3085 case relocInfo::virtual_call_type: return "virtual_call"; 3086 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 3087 case relocInfo::static_call_type: return "static_call"; 3088 case relocInfo::static_stub_type: return "static_stub"; 3089 case relocInfo::external_word_type: return "external_word"; 3090 case relocInfo::internal_word_type: return "internal_word"; 3091 case relocInfo::section_word_type: return "section_word"; 3092 case relocInfo::poll_type: return "poll"; 3093 case relocInfo::poll_return_type: return "poll_return"; 3094 case relocInfo::type_mask: return "type_bit_mask"; 3095 } 3096 } 3097 return have_one ? "other" : NULL; 3098} 3099 3100// Return a the last scope in (begin..end] 3101ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3102 PcDesc* p = pc_desc_near(begin+1); 3103 if (p != NULL && p->real_pc(this) <= end) { 3104 return new ScopeDesc(this, p->scope_decode_offset(), 3105 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3106 p->return_oop()); 3107 } 3108 return NULL; 3109} 3110 3111void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3112 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3113 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3114 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3115 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3116 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3117 3118 if (has_method_handle_invokes()) 3119 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3120 3121 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3122 3123 if (block_begin == entry_point()) { 3124 methodHandle m = method(); 3125 if (m.not_null()) { 3126 stream->print(" # "); 3127 m->print_value_on(stream); 3128 stream->cr(); 3129 } 3130 if (m.not_null() && !is_osr_method()) { 3131 ResourceMark rm; 3132 int sizeargs = m->size_of_parameters(); 3133 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3134 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3135 { 3136 int sig_index = 0; 3137 if (!m->is_static()) 3138 sig_bt[sig_index++] = T_OBJECT; // 'this' 3139 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3140 BasicType t = ss.type(); 3141 sig_bt[sig_index++] = t; 3142 if (type2size[t] == 2) { 3143 sig_bt[sig_index++] = T_VOID; 3144 } else { 3145 assert(type2size[t] == 1, "size is 1 or 2"); 3146 } 3147 } 3148 assert(sig_index == sizeargs, ""); 3149 } 3150 const char* spname = "sp"; // make arch-specific? 3151 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3152 int stack_slot_offset = this->frame_size() * wordSize; 3153 int tab1 = 14, tab2 = 24; 3154 int sig_index = 0; 3155 int arg_index = (m->is_static() ? 0 : -1); 3156 bool did_old_sp = false; 3157 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3158 bool at_this = (arg_index == -1); 3159 bool at_old_sp = false; 3160 BasicType t = (at_this ? T_OBJECT : ss.type()); 3161 assert(t == sig_bt[sig_index], "sigs in sync"); 3162 if (at_this) 3163 stream->print(" # this: "); 3164 else 3165 stream->print(" # parm%d: ", arg_index); 3166 stream->move_to(tab1); 3167 VMReg fst = regs[sig_index].first(); 3168 VMReg snd = regs[sig_index].second(); 3169 if (fst->is_reg()) { 3170 stream->print("%s", fst->name()); 3171 if (snd->is_valid()) { 3172 stream->print(":%s", snd->name()); 3173 } 3174 } else if (fst->is_stack()) { 3175 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3176 if (offset == stack_slot_offset) at_old_sp = true; 3177 stream->print("[%s+0x%x]", spname, offset); 3178 } else { 3179 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3180 } 3181 stream->print(" "); 3182 stream->move_to(tab2); 3183 stream->print("= "); 3184 if (at_this) { 3185 m->method_holder()->print_value_on(stream); 3186 } else { 3187 bool did_name = false; 3188 if (!at_this && ss.is_object()) { 3189 Symbol* name = ss.as_symbol_or_null(); 3190 if (name != NULL) { 3191 name->print_value_on(stream); 3192 did_name = true; 3193 } 3194 } 3195 if (!did_name) 3196 stream->print("%s", type2name(t)); 3197 } 3198 if (at_old_sp) { 3199 stream->print(" (%s of caller)", spname); 3200 did_old_sp = true; 3201 } 3202 stream->cr(); 3203 sig_index += type2size[t]; 3204 arg_index += 1; 3205 if (!at_this) ss.next(); 3206 } 3207 if (!did_old_sp) { 3208 stream->print(" # "); 3209 stream->move_to(tab1); 3210 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3211 stream->print(" (%s of caller)", spname); 3212 stream->cr(); 3213 } 3214 } 3215 } 3216} 3217 3218void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3219 // First, find an oopmap in (begin, end]. 3220 // We use the odd half-closed interval so that oop maps and scope descs 3221 // which are tied to the byte after a call are printed with the call itself. 3222 address base = code_begin(); 3223 ImmutableOopMapSet* oms = oop_maps(); 3224 if (oms != NULL) { 3225 for (int i = 0, imax = oms->count(); i < imax; i++) { 3226 const ImmutableOopMapPair* pair = oms->pair_at(i); 3227 const ImmutableOopMap* om = pair->get_from(oms); 3228 address pc = base + pair->pc_offset(); 3229 if (pc > begin) { 3230 if (pc <= end) { 3231 st->move_to(column); 3232 st->print("; "); 3233 om->print_on(st); 3234 } 3235 break; 3236 } 3237 } 3238 } 3239 3240 // Print any debug info present at this pc. 3241 ScopeDesc* sd = scope_desc_in(begin, end); 3242 if (sd != NULL) { 3243 st->move_to(column); 3244 if (sd->bci() == SynchronizationEntryBCI) { 3245 st->print(";*synchronization entry"); 3246 } else { 3247 if (sd->method() == NULL) { 3248 st->print("method is NULL"); 3249 } else if (sd->method()->is_native()) { 3250 st->print("method is native"); 3251 } else { 3252 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3253 st->print(";*%s", Bytecodes::name(bc)); 3254 switch (bc) { 3255 case Bytecodes::_invokevirtual: 3256 case Bytecodes::_invokespecial: 3257 case Bytecodes::_invokestatic: 3258 case Bytecodes::_invokeinterface: 3259 { 3260 Bytecode_invoke invoke(sd->method(), sd->bci()); 3261 st->print(" "); 3262 if (invoke.name() != NULL) 3263 invoke.name()->print_symbol_on(st); 3264 else 3265 st->print("<UNKNOWN>"); 3266 break; 3267 } 3268 case Bytecodes::_getfield: 3269 case Bytecodes::_putfield: 3270 case Bytecodes::_getstatic: 3271 case Bytecodes::_putstatic: 3272 { 3273 Bytecode_field field(sd->method(), sd->bci()); 3274 st->print(" "); 3275 if (field.name() != NULL) 3276 field.name()->print_symbol_on(st); 3277 else 3278 st->print("<UNKNOWN>"); 3279 } 3280 } 3281 } 3282 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3283 } 3284 3285 // Print all scopes 3286 for (;sd != NULL; sd = sd->sender()) { 3287 st->move_to(column); 3288 st->print("; -"); 3289 if (sd->method() == NULL) { 3290 st->print("method is NULL"); 3291 } else { 3292 sd->method()->print_short_name(st); 3293 } 3294 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3295 if (lineno != -1) { 3296 st->print("@%d (line %d)", sd->bci(), lineno); 3297 } else { 3298 st->print("@%d", sd->bci()); 3299 } 3300 st->cr(); 3301 } 3302 } 3303 3304 // Print relocation information 3305 const char* str = reloc_string_for(begin, end); 3306 if (str != NULL) { 3307 if (sd != NULL) st->cr(); 3308 st->move_to(column); 3309 st->print("; {%s}", str); 3310 } 3311 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3312 if (cont_offset != 0) { 3313 st->move_to(column); 3314 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3315 } 3316 3317} 3318 3319#ifndef PRODUCT 3320 3321void nmethod::print_value_on(outputStream* st) const { 3322 st->print("nmethod"); 3323 print_on(st, NULL); 3324} 3325 3326void nmethod::print_calls(outputStream* st) { 3327 RelocIterator iter(this); 3328 while (iter.next()) { 3329 switch (iter.type()) { 3330 case relocInfo::virtual_call_type: 3331 case relocInfo::opt_virtual_call_type: { 3332 VerifyMutexLocker mc(CompiledIC_lock); 3333 CompiledIC_at(&iter)->print(); 3334 break; 3335 } 3336 case relocInfo::static_call_type: 3337 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3338 compiledStaticCall_at(iter.reloc())->print(); 3339 break; 3340 } 3341 } 3342} 3343 3344void nmethod::print_handler_table() { 3345 ExceptionHandlerTable(this).print(); 3346} 3347 3348void nmethod::print_nul_chk_table() { 3349 ImplicitExceptionTable(this).print(code_begin()); 3350} 3351 3352void nmethod::print_statistics() { 3353 ttyLocker ttyl; 3354 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3355 native_nmethod_stats.print_native_nmethod_stats(); 3356#ifdef COMPILER1 3357 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3358#endif 3359#ifdef COMPILER2 3360 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3361#endif 3362#if INCLUDE_JVMCI 3363 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3364#endif 3365#ifdef SHARK 3366 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 3367#endif 3368 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3369 DebugInformationRecorder::print_statistics(); 3370#ifndef PRODUCT 3371 pc_nmethod_stats.print_pc_stats(); 3372#endif 3373 Dependencies::print_statistics(); 3374 if (xtty != NULL) xtty->tail("statistics"); 3375} 3376 3377#endif // !PRODUCT 3378 3379#if INCLUDE_JVMCI 3380void nmethod::maybe_invalidate_installed_code() { 3381 if (_jvmci_installed_code != NULL) { 3382 if (!is_alive()) { 3383 // Break the link between nmethod and InstalledCode such that the nmethod 3384 // can subsequently be flushed safely. The link must be maintained while 3385 // the method could have live activations since invalidateInstalledCode 3386 // might want to invalidate all existing activations. 3387 InstalledCode::set_address(_jvmci_installed_code, 0); 3388 InstalledCode::set_entryPoint(_jvmci_installed_code, 0); 3389 _jvmci_installed_code = NULL; 3390 } else if (is_not_entrant()) { 3391 InstalledCode::set_entryPoint(_jvmci_installed_code, 0); 3392 } 3393 } 3394} 3395 3396char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 3397 if (!this->is_compiled_by_jvmci()) { 3398 return NULL; 3399 } 3400 oop installedCode = this->jvmci_installed_code(); 3401 if (installedCode != NULL) { 3402 oop installedCodeName = NULL; 3403 if (installedCode->is_a(InstalledCode::klass())) { 3404 installedCodeName = InstalledCode::name(installedCode); 3405 } 3406 if (installedCodeName != NULL) { 3407 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3408 } else { 3409 jio_snprintf(buf, buflen, "null"); 3410 return buf; 3411 } 3412 } 3413 jio_snprintf(buf, buflen, "noInstalledCode"); 3414 return buf; 3415} 3416#endif 3417