nmethod.cpp revision 9149:a8a8604f890f
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/compilerOracle.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 if ((PrintAssembly || CompilerOracle::should_print(method)) && nm != NULL) { 586 Disassembler::decode(nm); 587 } 588 } 589 // verify nmethod 590 debug_only(if (nm) nm->verify();) // might block 591 592 if (nm != NULL) { 593 nm->log_new_nmethod(); 594 } 595 596 return nm; 597} 598 599nmethod* nmethod::new_nmethod(methodHandle method, 600 int compile_id, 601 int entry_bci, 602 CodeOffsets* offsets, 603 int orig_pc_offset, 604 DebugInformationRecorder* debug_info, 605 Dependencies* dependencies, 606 CodeBuffer* code_buffer, int frame_size, 607 OopMapSet* oop_maps, 608 ExceptionHandlerTable* handler_table, 609 ImplicitExceptionTable* nul_chk_table, 610 AbstractCompiler* compiler, 611 int comp_level 612#if INCLUDE_JVMCI 613 , Handle installed_code, 614 Handle speculationLog 615#endif 616) 617{ 618 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 619 code_buffer->finalize_oop_references(method); 620 // create nmethod 621 nmethod* nm = NULL; 622 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 623 int nmethod_size = 624 allocation_size(code_buffer, sizeof(nmethod)) 625 + adjust_pcs_size(debug_info->pcs_size()) 626 + round_to(dependencies->size_in_bytes() , oopSize) 627 + round_to(handler_table->size_in_bytes(), oopSize) 628 + round_to(nul_chk_table->size_in_bytes(), oopSize) 629 + round_to(debug_info->data_size() , oopSize); 630 631 nm = new (nmethod_size, comp_level) 632 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 633 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 634 oop_maps, 635 handler_table, 636 nul_chk_table, 637 compiler, 638 comp_level 639#if INCLUDE_JVMCI 640 , installed_code, 641 speculationLog 642#endif 643 ); 644 645 if (nm != NULL) { 646 // To make dependency checking during class loading fast, record 647 // the nmethod dependencies in the classes it is dependent on. 648 // This allows the dependency checking code to simply walk the 649 // class hierarchy above the loaded class, checking only nmethods 650 // which are dependent on those classes. The slow way is to 651 // check every nmethod for dependencies which makes it linear in 652 // the number of methods compiled. For applications with a lot 653 // classes the slow way is too slow. 654 for (Dependencies::DepStream deps(nm); deps.next(); ) { 655 if (deps.type() == Dependencies::call_site_target_value) { 656 // CallSite dependencies are managed on per-CallSite instance basis. 657 oop call_site = deps.argument_oop(0); 658 MethodHandles::add_dependent_nmethod(call_site, nm); 659 } else { 660 Klass* klass = deps.context_type(); 661 if (klass == NULL) { 662 continue; // ignore things like evol_method 663 } 664 // record this nmethod as dependent on this klass 665 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 666 } 667 } 668 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 669 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 670 Disassembler::decode(nm); 671 } 672 } 673 } 674 // Do verification and logging outside CodeCache_lock. 675 if (nm != NULL) { 676 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 677 DEBUG_ONLY(nm->verify();) 678 nm->log_new_nmethod(); 679 } 680 return nm; 681} 682 683#ifdef _MSC_VER 684#pragma warning(push) 685#pragma warning(disable:4355) // warning C4355: 'this' : used in base member initializer list 686#endif 687// For native wrappers 688nmethod::nmethod( 689 Method* method, 690 int nmethod_size, 691 int compile_id, 692 CodeOffsets* offsets, 693 CodeBuffer* code_buffer, 694 int frame_size, 695 ByteSize basic_lock_owner_sp_offset, 696 ByteSize basic_lock_sp_offset, 697 OopMapSet* oop_maps ) 698 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 699 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 700 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 701 _native_basic_lock_sp_offset(basic_lock_sp_offset) 702{ 703 { 704 debug_only(No_Safepoint_Verifier nsv;) 705 assert_locked_or_safepoint(CodeCache_lock); 706 707 init_defaults(); 708 _method = method; 709 _entry_bci = InvocationEntryBci; 710 // We have no exception handler or deopt handler make the 711 // values something that will never match a pc like the nmethod vtable entry 712 _exception_offset = 0; 713 _deoptimize_offset = 0; 714 _deoptimize_mh_offset = 0; 715 _orig_pc_offset = 0; 716 717 _consts_offset = data_offset(); 718 _stub_offset = data_offset(); 719 _oops_offset = data_offset(); 720 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 721 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 722 _scopes_pcs_offset = _scopes_data_offset; 723 _dependencies_offset = _scopes_pcs_offset; 724 _handler_table_offset = _dependencies_offset; 725 _nul_chk_table_offset = _handler_table_offset; 726 _nmethod_end_offset = _nul_chk_table_offset; 727 _compile_id = compile_id; 728 _comp_level = CompLevel_none; 729 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 730 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 731 _osr_entry_point = NULL; 732 _exception_cache = NULL; 733 _pc_desc_cache.reset_to(NULL); 734 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 735 736 code_buffer->copy_values_to(this); 737 if (ScavengeRootsInCode) { 738 if (detect_scavenge_root_oops()) { 739 CodeCache::add_scavenge_root_nmethod(this); 740 } 741 Universe::heap()->register_nmethod(this); 742 } 743 debug_only(verify_scavenge_root_oops()); 744 CodeCache::commit(this); 745 } 746 747 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 748 ttyLocker ttyl; // keep the following output all in one block 749 // This output goes directly to the tty, not the compiler log. 750 // To enable tools to match it up with the compilation activity, 751 // be sure to tag this tty output with the compile ID. 752 if (xtty != NULL) { 753 xtty->begin_head("print_native_nmethod"); 754 xtty->method(_method); 755 xtty->stamp(); 756 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 757 } 758 // print the header part first 759 print(); 760 // then print the requested information 761 if (PrintNativeNMethods) { 762 print_code(); 763 if (oop_maps != NULL) { 764 oop_maps->print(); 765 } 766 } 767 if (PrintRelocations) { 768 print_relocations(); 769 } 770 if (xtty != NULL) { 771 xtty->tail("print_native_nmethod"); 772 } 773 } 774} 775 776#ifdef _MSC_VER 777#pragma warning(pop) 778#endif 779 780void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 781 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 782} 783 784nmethod::nmethod( 785 Method* method, 786 int nmethod_size, 787 int compile_id, 788 int entry_bci, 789 CodeOffsets* offsets, 790 int orig_pc_offset, 791 DebugInformationRecorder* debug_info, 792 Dependencies* dependencies, 793 CodeBuffer *code_buffer, 794 int frame_size, 795 OopMapSet* oop_maps, 796 ExceptionHandlerTable* handler_table, 797 ImplicitExceptionTable* nul_chk_table, 798 AbstractCompiler* compiler, 799 int comp_level 800#if INCLUDE_JVMCI 801 , Handle installed_code, 802 Handle speculation_log 803#endif 804 ) 805 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 806 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 807 _native_receiver_sp_offset(in_ByteSize(-1)), 808 _native_basic_lock_sp_offset(in_ByteSize(-1)) 809{ 810 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 811 { 812 debug_only(No_Safepoint_Verifier nsv;) 813 assert_locked_or_safepoint(CodeCache_lock); 814 815 init_defaults(); 816 _method = method; 817 _entry_bci = entry_bci; 818 _compile_id = compile_id; 819 _comp_level = comp_level; 820 _compiler = compiler; 821 _orig_pc_offset = orig_pc_offset; 822 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 823 824 // Section offsets 825 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 826 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 827 828#if INCLUDE_JVMCI 829 _jvmci_installed_code = installed_code(); 830 _speculation_log = (instanceOop)speculation_log(); 831 832 if (compiler->is_jvmci()) { 833 // JVMCI might not produce any stub sections 834 if (offsets->value(CodeOffsets::Exceptions) != -1) { 835 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 836 } else { 837 _exception_offset = -1; 838 } 839 if (offsets->value(CodeOffsets::Deopt) != -1) { 840 _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); 841 } else { 842 _deoptimize_offset = -1; 843 } 844 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 845 _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); 846 } else { 847 _deoptimize_mh_offset = -1; 848 } 849 } else { 850#endif 851 // Exception handler and deopt handler are in the stub section 852 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 853 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 854 855 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 856 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 857 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 858 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 859 } else { 860 _deoptimize_mh_offset = -1; 861#if INCLUDE_JVMCI 862 } 863#endif 864 } 865 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 866 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 867 } else { 868 _unwind_handler_offset = -1; 869 } 870 871 _oops_offset = data_offset(); 872 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 873 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 874 875 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 876 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 877 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 878 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 879 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 880 881 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 882 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 883 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 884 _exception_cache = NULL; 885 _pc_desc_cache.reset_to(scopes_pcs_begin()); 886 887 // Copy contents of ScopeDescRecorder to nmethod 888 code_buffer->copy_values_to(this); 889 debug_info->copy_to(this); 890 dependencies->copy_to(this); 891 if (ScavengeRootsInCode) { 892 if (detect_scavenge_root_oops()) { 893 CodeCache::add_scavenge_root_nmethod(this); 894 } 895 Universe::heap()->register_nmethod(this); 896 } 897 debug_only(verify_scavenge_root_oops()); 898 899 CodeCache::commit(this); 900 901 // Copy contents of ExceptionHandlerTable to nmethod 902 handler_table->copy_to(this); 903 nul_chk_table->copy_to(this); 904 905 // we use the information of entry points to find out if a method is 906 // static or non static 907 assert(compiler->is_c2() || compiler->is_jvmci() || 908 _method->is_static() == (entry_point() == _verified_entry_point), 909 " entry points must be same for static methods and vice versa"); 910 } 911 912 bool printnmethods = PrintNMethods || PrintNMethodsAtLevel == _comp_level 913 || CompilerOracle::should_print(_method) 914 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 915 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 916 print_nmethod(printnmethods); 917 } 918} 919 920// Print a short set of xml attributes to identify this nmethod. The 921// output should be embedded in some other element. 922void nmethod::log_identity(xmlStream* log) const { 923 log->print(" compile_id='%d'", compile_id()); 924 const char* nm_kind = compile_kind(); 925 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 926 if (compiler() != NULL) { 927 log->print(" compiler='%s'", compiler()->name()); 928 } 929 if (TieredCompilation) { 930 log->print(" level='%d'", comp_level()); 931 } 932} 933 934 935#define LOG_OFFSET(log, name) \ 936 if (p2i(name##_end()) - p2i(name##_begin())) \ 937 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 938 p2i(name##_begin()) - p2i(this)) 939 940 941void nmethod::log_new_nmethod() const { 942 if (LogCompilation && xtty != NULL) { 943 ttyLocker ttyl; 944 HandleMark hm; 945 xtty->begin_elem("nmethod"); 946 log_identity(xtty); 947 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 948 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 949 950 LOG_OFFSET(xtty, relocation); 951 LOG_OFFSET(xtty, consts); 952 LOG_OFFSET(xtty, insts); 953 LOG_OFFSET(xtty, stub); 954 LOG_OFFSET(xtty, scopes_data); 955 LOG_OFFSET(xtty, scopes_pcs); 956 LOG_OFFSET(xtty, dependencies); 957 LOG_OFFSET(xtty, handler_table); 958 LOG_OFFSET(xtty, nul_chk_table); 959 LOG_OFFSET(xtty, oops); 960 LOG_OFFSET(xtty, metadata); 961 962 xtty->method(method()); 963 xtty->stamp(); 964 xtty->end_elem(); 965 } 966} 967 968#undef LOG_OFFSET 969 970 971// Print out more verbose output usually for a newly created nmethod. 972void nmethod::print_on(outputStream* st, const char* msg) const { 973 if (st != NULL) { 974 ttyLocker ttyl; 975 if (WizardMode) { 976 CompileTask::print(st, this, msg, /*short_form:*/ true); 977 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 978 } else { 979 CompileTask::print(st, this, msg, /*short_form:*/ false); 980 } 981 } 982} 983 984 985void nmethod::print_nmethod(bool printmethod) { 986 ttyLocker ttyl; // keep the following output all in one block 987 if (xtty != NULL) { 988 xtty->begin_head("print_nmethod"); 989 xtty->stamp(); 990 xtty->end_head(); 991 } 992 // print the header part first 993 print(); 994 // then print the requested information 995 if (printmethod) { 996 print_code(); 997 print_pcs(); 998 if (oop_maps()) { 999 oop_maps()->print(); 1000 } 1001 } 1002 if (PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 1003 print_scopes(); 1004 } 1005 if (PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 1006 print_relocations(); 1007 } 1008 if (PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 1009 print_dependencies(); 1010 } 1011 if (PrintExceptionHandlers) { 1012 print_handler_table(); 1013 print_nul_chk_table(); 1014 } 1015 if (xtty != NULL) { 1016 xtty->tail("print_nmethod"); 1017 } 1018} 1019 1020 1021// Promote one word from an assembly-time handle to a live embedded oop. 1022inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1023 if (handle == NULL || 1024 // As a special case, IC oops are initialized to 1 or -1. 1025 handle == (jobject) Universe::non_oop_word()) { 1026 (*dest) = (oop) handle; 1027 } else { 1028 (*dest) = JNIHandles::resolve_non_null(handle); 1029 } 1030} 1031 1032 1033// Have to have the same name because it's called by a template 1034void nmethod::copy_values(GrowableArray<jobject>* array) { 1035 int length = array->length(); 1036 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1037 oop* dest = oops_begin(); 1038 for (int index = 0 ; index < length; index++) { 1039 initialize_immediate_oop(&dest[index], array->at(index)); 1040 } 1041 1042 // Now we can fix up all the oops in the code. We need to do this 1043 // in the code because the assembler uses jobjects as placeholders. 1044 // The code and relocations have already been initialized by the 1045 // CodeBlob constructor, so it is valid even at this early point to 1046 // iterate over relocations and patch the code. 1047 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1048} 1049 1050void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1051 int length = array->length(); 1052 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1053 Metadata** dest = metadata_begin(); 1054 for (int index = 0 ; index < length; index++) { 1055 dest[index] = array->at(index); 1056 } 1057} 1058 1059bool nmethod::is_at_poll_return(address pc) { 1060 RelocIterator iter(this, pc, pc+1); 1061 while (iter.next()) { 1062 if (iter.type() == relocInfo::poll_return_type) 1063 return true; 1064 } 1065 return false; 1066} 1067 1068 1069bool nmethod::is_at_poll_or_poll_return(address pc) { 1070 RelocIterator iter(this, pc, pc+1); 1071 while (iter.next()) { 1072 relocInfo::relocType t = iter.type(); 1073 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1074 return true; 1075 } 1076 return false; 1077} 1078 1079 1080void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1081 // re-patch all oop-bearing instructions, just in case some oops moved 1082 RelocIterator iter(this, begin, end); 1083 while (iter.next()) { 1084 if (iter.type() == relocInfo::oop_type) { 1085 oop_Relocation* reloc = iter.oop_reloc(); 1086 if (initialize_immediates && reloc->oop_is_immediate()) { 1087 oop* dest = reloc->oop_addr(); 1088 initialize_immediate_oop(dest, (jobject) *dest); 1089 } 1090 // Refresh the oop-related bits of this instruction. 1091 reloc->fix_oop_relocation(); 1092 } else if (iter.type() == relocInfo::metadata_type) { 1093 metadata_Relocation* reloc = iter.metadata_reloc(); 1094 reloc->fix_metadata_relocation(); 1095 } 1096 } 1097} 1098 1099 1100void nmethod::verify_oop_relocations() { 1101 // Ensure sure that the code matches the current oop values 1102 RelocIterator iter(this, NULL, NULL); 1103 while (iter.next()) { 1104 if (iter.type() == relocInfo::oop_type) { 1105 oop_Relocation* reloc = iter.oop_reloc(); 1106 if (!reloc->oop_is_immediate()) { 1107 reloc->verify_oop_relocation(); 1108 } 1109 } 1110 } 1111} 1112 1113 1114ScopeDesc* nmethod::scope_desc_at(address pc) { 1115 PcDesc* pd = pc_desc_at(pc); 1116 guarantee(pd != NULL, "scope must be present"); 1117 return new ScopeDesc(this, pd->scope_decode_offset(), 1118 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 1119 pd->return_oop()); 1120} 1121 1122 1123void nmethod::clear_inline_caches() { 1124 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1125 if (is_zombie()) { 1126 return; 1127 } 1128 1129 RelocIterator iter(this); 1130 while (iter.next()) { 1131 iter.reloc()->clear_inline_cache(); 1132 } 1133} 1134 1135// Clear ICStubs of all compiled ICs 1136void nmethod::clear_ic_stubs() { 1137 assert_locked_or_safepoint(CompiledIC_lock); 1138 RelocIterator iter(this); 1139 while(iter.next()) { 1140 if (iter.type() == relocInfo::virtual_call_type) { 1141 CompiledIC* ic = CompiledIC_at(&iter); 1142 ic->clear_ic_stub(); 1143 } 1144 } 1145} 1146 1147 1148void nmethod::cleanup_inline_caches() { 1149 assert_locked_or_safepoint(CompiledIC_lock); 1150 1151 // If the method is not entrant or zombie then a JMP is plastered over the 1152 // first few bytes. If an oop in the old code was there, that oop 1153 // should not get GC'd. Skip the first few bytes of oops on 1154 // not-entrant methods. 1155 address low_boundary = verified_entry_point(); 1156 if (!is_in_use()) { 1157 low_boundary += NativeJump::instruction_size; 1158 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1159 // This means that the low_boundary is going to be a little too high. 1160 // This shouldn't matter, since oops of non-entrant methods are never used. 1161 // In fact, why are we bothering to look at oops in a non-entrant method?? 1162 } 1163 1164 // Find all calls in an nmethod and clear the ones that point to non-entrant, 1165 // zombie and unloaded nmethods. 1166 ResourceMark rm; 1167 RelocIterator iter(this, low_boundary); 1168 while(iter.next()) { 1169 switch(iter.type()) { 1170 case relocInfo::virtual_call_type: 1171 case relocInfo::opt_virtual_call_type: { 1172 CompiledIC *ic = CompiledIC_at(&iter); 1173 // Ok, to lookup references to zombies here 1174 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1175 if( cb != NULL && cb->is_nmethod() ) { 1176 nmethod* nm = (nmethod*)cb; 1177 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1178 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(is_alive()); 1179 } 1180 break; 1181 } 1182 case relocInfo::static_call_type: { 1183 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1184 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1185 if( cb != NULL && cb->is_nmethod() ) { 1186 nmethod* nm = (nmethod*)cb; 1187 // Clean inline caches pointing to zombie, non-entrant and unloaded methods 1188 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1189 } 1190 break; 1191 } 1192 } 1193 } 1194} 1195 1196void nmethod::verify_clean_inline_caches() { 1197 assert_locked_or_safepoint(CompiledIC_lock); 1198 1199 // If the method is not entrant or zombie then a JMP is plastered over the 1200 // first few bytes. If an oop in the old code was there, that oop 1201 // should not get GC'd. Skip the first few bytes of oops on 1202 // not-entrant methods. 1203 address low_boundary = verified_entry_point(); 1204 if (!is_in_use()) { 1205 low_boundary += NativeJump::instruction_size; 1206 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1207 // This means that the low_boundary is going to be a little too high. 1208 // This shouldn't matter, since oops of non-entrant methods are never used. 1209 // In fact, why are we bothering to look at oops in a non-entrant method?? 1210 } 1211 1212 ResourceMark rm; 1213 RelocIterator iter(this, low_boundary); 1214 while(iter.next()) { 1215 switch(iter.type()) { 1216 case relocInfo::virtual_call_type: 1217 case relocInfo::opt_virtual_call_type: { 1218 CompiledIC *ic = CompiledIC_at(&iter); 1219 // Ok, to lookup references to zombies here 1220 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1221 if( cb != NULL && cb->is_nmethod() ) { 1222 nmethod* nm = (nmethod*)cb; 1223 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1224 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1225 assert(ic->is_clean(), "IC should be clean"); 1226 } 1227 } 1228 break; 1229 } 1230 case relocInfo::static_call_type: { 1231 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1232 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1233 if( cb != NULL && cb->is_nmethod() ) { 1234 nmethod* nm = (nmethod*)cb; 1235 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1236 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1237 assert(csc->is_clean(), "IC should be clean"); 1238 } 1239 } 1240 break; 1241 } 1242 } 1243 } 1244} 1245 1246int nmethod::verify_icholder_relocations() { 1247 int count = 0; 1248 1249 RelocIterator iter(this); 1250 while(iter.next()) { 1251 if (iter.type() == relocInfo::virtual_call_type) { 1252 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1253 CompiledIC *ic = CompiledIC_at(&iter); 1254 if (TraceCompiledIC) { 1255 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1256 ic->print(); 1257 } 1258 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1259 count++; 1260 } 1261 } 1262 } 1263 1264 return count; 1265} 1266 1267// This is a private interface with the sweeper. 1268void nmethod::mark_as_seen_on_stack() { 1269 assert(is_alive(), "Must be an alive method"); 1270 // Set the traversal mark to ensure that the sweeper does 2 1271 // cleaning passes before moving to zombie. 1272 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1273} 1274 1275// Tell if a non-entrant method can be converted to a zombie (i.e., 1276// there are no activations on the stack, not in use by the VM, 1277// and not in use by the ServiceThread) 1278bool nmethod::can_convert_to_zombie() { 1279 assert(is_not_entrant(), "must be a non-entrant method"); 1280 1281 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1282 // count can be greater than the stack traversal count before it hits the 1283 // nmethod for the second time. 1284 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1285 !is_locked_by_vm(); 1286} 1287 1288void nmethod::inc_decompile_count() { 1289 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1290 // Could be gated by ProfileTraps, but do not bother... 1291 Method* m = method(); 1292 if (m == NULL) return; 1293 MethodData* mdo = m->method_data(); 1294 if (mdo == NULL) return; 1295 // There is a benign race here. See comments in methodData.hpp. 1296 mdo->inc_decompile_count(); 1297} 1298 1299void nmethod::increase_unloading_clock() { 1300 _global_unloading_clock++; 1301 if (_global_unloading_clock == 0) { 1302 // _nmethods are allocated with _unloading_clock == 0, 1303 // so 0 is never used as a clock value. 1304 _global_unloading_clock = 1; 1305 } 1306} 1307 1308void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1309 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1310} 1311 1312unsigned char nmethod::unloading_clock() { 1313 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1314} 1315 1316void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1317 1318 post_compiled_method_unload(); 1319 1320 // Since this nmethod is being unloaded, make sure that dependencies 1321 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1322 // indicate that this work is being done during a GC. 1323 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1324 assert(is_alive != NULL, "Should be non-NULL"); 1325 // A non-NULL is_alive closure indicates that this is being called during GC. 1326 flush_dependencies(is_alive); 1327 1328 // Break cycle between nmethod & method 1329 if (TraceClassUnloading && WizardMode) { 1330 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1331 " unloadable], Method*(" INTPTR_FORMAT 1332 "), cause(" INTPTR_FORMAT ")", 1333 p2i(this), p2i(_method), p2i(cause)); 1334 if (!Universe::heap()->is_gc_active()) 1335 cause->klass()->print(); 1336 } 1337 // Unlink the osr method, so we do not look this up again 1338 if (is_osr_method()) { 1339 invalidate_osr_method(); 1340 } 1341 // If _method is already NULL the Method* is about to be unloaded, 1342 // so we don't have to break the cycle. Note that it is possible to 1343 // have the Method* live here, in case we unload the nmethod because 1344 // it is pointing to some oop (other than the Method*) being unloaded. 1345 if (_method != NULL) { 1346 // OSR methods point to the Method*, but the Method* does not 1347 // point back! 1348 if (_method->code() == this) { 1349 _method->clear_code(); // Break a cycle 1350 } 1351 _method = NULL; // Clear the method of this dead nmethod 1352 } 1353 1354 // Make the class unloaded - i.e., change state and notify sweeper 1355 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1356 if (is_in_use()) { 1357 // Transitioning directly from live to unloaded -- so 1358 // we need to force a cache clean-up; remember this 1359 // for later on. 1360 CodeCache::set_needs_cache_clean(true); 1361 } 1362 1363 // Unregister must be done before the state change 1364 Universe::heap()->unregister_nmethod(this); 1365 1366#if INCLUDE_JVMCI 1367 // The method can only be unloaded after the pointer to the installed code 1368 // Java wrapper is no longer alive. Here we need to clear out this weak 1369 // reference to the dead object. Nulling out the reference has to happen 1370 // after the method is unregistered since the original value may be still 1371 // tracked by the rset. 1372 if (_jvmci_installed_code != NULL) { 1373 InstalledCode::set_address(_jvmci_installed_code, 0); 1374 _jvmci_installed_code = NULL; 1375 } 1376#endif 1377 1378 _state = unloaded; 1379 1380 // Log the unloading. 1381 log_state_change(); 1382 1383 // The Method* is gone at this point 1384 assert(_method == NULL, "Tautology"); 1385 1386 set_osr_link(NULL); 1387 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1388 NMethodSweeper::report_state_change(this); 1389} 1390 1391void nmethod::invalidate_osr_method() { 1392 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1393 // Remove from list of active nmethods 1394 if (method() != NULL) 1395 method()->method_holder()->remove_osr_nmethod(this); 1396} 1397 1398void nmethod::log_state_change() const { 1399 if (LogCompilation) { 1400 if (xtty != NULL) { 1401 ttyLocker ttyl; // keep the following output all in one block 1402 if (_state == unloaded) { 1403 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1404 os::current_thread_id()); 1405 } else { 1406 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1407 os::current_thread_id(), 1408 (_state == zombie ? " zombie='1'" : "")); 1409 } 1410 log_identity(xtty); 1411 xtty->stamp(); 1412 xtty->end_elem(); 1413 } 1414 } 1415 if (PrintCompilation && _state != unloaded) { 1416 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1417 } 1418} 1419 1420/** 1421 * Common functionality for both make_not_entrant and make_zombie 1422 */ 1423bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1424 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1425 assert(!is_zombie(), "should not already be a zombie"); 1426 1427 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1428 nmethodLocker nml(this); 1429 methodHandle the_method(method()); 1430 No_Safepoint_Verifier nsv; 1431 1432 // during patching, depending on the nmethod state we must notify the GC that 1433 // code has been unloaded, unregistering it. We cannot do this right while 1434 // holding the Patching_lock because we need to use the CodeCache_lock. This 1435 // would be prone to deadlocks. 1436 // This flag is used to remember whether we need to later lock and unregister. 1437 bool nmethod_needs_unregister = false; 1438 1439 { 1440 // invalidate osr nmethod before acquiring the patching lock since 1441 // they both acquire leaf locks and we don't want a deadlock. 1442 // This logic is equivalent to the logic below for patching the 1443 // verified entry point of regular methods. 1444 if (is_osr_method()) { 1445 // this effectively makes the osr nmethod not entrant 1446 invalidate_osr_method(); 1447 } 1448 1449 // Enter critical section. Does not block for safepoint. 1450 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1451 1452 if (_state == state) { 1453 // another thread already performed this transition so nothing 1454 // to do, but return false to indicate this. 1455 return false; 1456 } 1457 1458 // The caller can be calling the method statically or through an inline 1459 // cache call. 1460 if (!is_osr_method() && !is_not_entrant()) { 1461 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1462 SharedRuntime::get_handle_wrong_method_stub()); 1463 } 1464 1465 if (is_in_use()) { 1466 // It's a true state change, so mark the method as decompiled. 1467 // Do it only for transition from alive. 1468 inc_decompile_count(); 1469 } 1470 1471 // If the state is becoming a zombie, signal to unregister the nmethod with 1472 // the heap. 1473 // This nmethod may have already been unloaded during a full GC. 1474 if ((state == zombie) && !is_unloaded()) { 1475 nmethod_needs_unregister = true; 1476 } 1477 1478 // Must happen before state change. Otherwise we have a race condition in 1479 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1480 // transition its state from 'not_entrant' to 'zombie' without having to wait 1481 // for stack scanning. 1482 if (state == not_entrant) { 1483 mark_as_seen_on_stack(); 1484 OrderAccess::storestore(); 1485 } 1486 1487 // Change state 1488 _state = state; 1489 1490 // Log the transition once 1491 log_state_change(); 1492 1493 // Remove nmethod from method. 1494 // We need to check if both the _code and _from_compiled_code_entry_point 1495 // refer to this nmethod because there is a race in setting these two fields 1496 // in Method* as seen in bugid 4947125. 1497 // If the vep() points to the zombie nmethod, the memory for the nmethod 1498 // could be flushed and the compiler and vtable stubs could still call 1499 // through it. 1500 if (method() != NULL && (method()->code() == this || 1501 method()->from_compiled_entry() == verified_entry_point())) { 1502 HandleMark hm; 1503 method()->clear_code(); 1504 } 1505 } // leave critical region under Patching_lock 1506 1507 // When the nmethod becomes zombie it is no longer alive so the 1508 // dependencies must be flushed. nmethods in the not_entrant 1509 // state will be flushed later when the transition to zombie 1510 // happens or they get unloaded. 1511 if (state == zombie) { 1512 { 1513 // Flushing dependecies must be done before any possible 1514 // safepoint can sneak in, otherwise the oops used by the 1515 // dependency logic could have become stale. 1516 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1517 if (nmethod_needs_unregister) { 1518 Universe::heap()->unregister_nmethod(this); 1519 } 1520 flush_dependencies(NULL); 1521 } 1522 1523 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1524 // event and it hasn't already been reported for this nmethod then 1525 // report it now. The event may have been reported earilier if the GC 1526 // marked it for unloading). JvmtiDeferredEventQueue support means 1527 // we no longer go to a safepoint here. 1528 post_compiled_method_unload(); 1529 1530#ifdef ASSERT 1531 // It's no longer safe to access the oops section since zombie 1532 // nmethods aren't scanned for GC. 1533 _oops_are_stale = true; 1534#endif 1535 // the Method may be reclaimed by class unloading now that the 1536 // nmethod is in zombie state 1537 set_method(NULL); 1538 } else { 1539 assert(state == not_entrant, "other cases may need to be handled differently"); 1540 } 1541#if INCLUDE_JVMCI 1542 if (_jvmci_installed_code != NULL) { 1543 // Break the link between nmethod and InstalledCode such that the nmethod can subsequently be flushed safely. 1544 InstalledCode::set_address(_jvmci_installed_code, 0); 1545 } 1546#endif 1547 1548 if (TraceCreateZombies) { 1549 ResourceMark m; 1550 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"); 1551 } 1552 1553 NMethodSweeper::report_state_change(this); 1554 return true; 1555} 1556 1557void nmethod::flush() { 1558 // Note that there are no valid oops in the nmethod anymore. 1559 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1560 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1561 1562 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1563 assert_locked_or_safepoint(CodeCache_lock); 1564 1565 // completely deallocate this method 1566 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1567 if (PrintMethodFlushing) { 1568 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1569 "/Free CodeCache:" SIZE_FORMAT "Kb", 1570 _compile_id, p2i(this), CodeCache::nof_blobs(), 1571 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1572 } 1573 1574 // We need to deallocate any ExceptionCache data. 1575 // Note that we do not need to grab the nmethod lock for this, it 1576 // better be thread safe if we're disposing of it! 1577 ExceptionCache* ec = exception_cache(); 1578 set_exception_cache(NULL); 1579 while(ec != NULL) { 1580 ExceptionCache* next = ec->next(); 1581 delete ec; 1582 ec = next; 1583 } 1584 1585 if (on_scavenge_root_list()) { 1586 CodeCache::drop_scavenge_root_nmethod(this); 1587 } 1588 1589#ifdef SHARK 1590 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1591#endif // SHARK 1592 1593 ((CodeBlob*)(this))->flush(); 1594 1595 CodeCache::free(this); 1596} 1597 1598// 1599// Notify all classes this nmethod is dependent on that it is no 1600// longer dependent. This should only be called in two situations. 1601// First, when a nmethod transitions to a zombie all dependents need 1602// to be clear. Since zombification happens at a safepoint there's no 1603// synchronization issues. The second place is a little more tricky. 1604// During phase 1 of mark sweep class unloading may happen and as a 1605// result some nmethods may get unloaded. In this case the flushing 1606// of dependencies must happen during phase 1 since after GC any 1607// dependencies in the unloaded nmethod won't be updated, so 1608// traversing the dependency information in unsafe. In that case this 1609// function is called with a non-NULL argument and this function only 1610// notifies instanceKlasses that are reachable 1611 1612void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1613 assert_locked_or_safepoint(CodeCache_lock); 1614 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1615 "is_alive is non-NULL if and only if we are called during GC"); 1616 if (!has_flushed_dependencies()) { 1617 set_has_flushed_dependencies(); 1618 for (Dependencies::DepStream deps(this); deps.next(); ) { 1619 if (deps.type() == Dependencies::call_site_target_value) { 1620 // CallSite dependencies are managed on per-CallSite instance basis. 1621 oop call_site = deps.argument_oop(0); 1622 MethodHandles::remove_dependent_nmethod(call_site, this); 1623 } else { 1624 Klass* klass = deps.context_type(); 1625 if (klass == NULL) { 1626 continue; // ignore things like evol_method 1627 } 1628 // During GC the is_alive closure is non-NULL, and is used to 1629 // determine liveness of dependees that need to be updated. 1630 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1631 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1632 } 1633 } 1634 } 1635 } 1636} 1637 1638 1639// If this oop is not live, the nmethod can be unloaded. 1640bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1641 assert(root != NULL, "just checking"); 1642 oop obj = *root; 1643 if (obj == NULL || is_alive->do_object_b(obj)) { 1644 return false; 1645 } 1646 1647 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1648 // simply because one of its constant oops has gone dead. 1649 // No actual classes need to be unloaded in order for this to occur. 1650 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1651 make_unloaded(is_alive, obj); 1652 return true; 1653} 1654 1655// ------------------------------------------------------------------ 1656// post_compiled_method_load_event 1657// new method for install_code() path 1658// Transfer information from compilation to jvmti 1659void nmethod::post_compiled_method_load_event() { 1660 1661 Method* moop = method(); 1662 HOTSPOT_COMPILED_METHOD_LOAD( 1663 (char *) moop->klass_name()->bytes(), 1664 moop->klass_name()->utf8_length(), 1665 (char *) moop->name()->bytes(), 1666 moop->name()->utf8_length(), 1667 (char *) moop->signature()->bytes(), 1668 moop->signature()->utf8_length(), 1669 insts_begin(), insts_size()); 1670 1671 if (JvmtiExport::should_post_compiled_method_load() || 1672 JvmtiExport::should_post_compiled_method_unload()) { 1673 get_and_cache_jmethod_id(); 1674 } 1675 1676 if (JvmtiExport::should_post_compiled_method_load()) { 1677 // Let the Service thread (which is a real Java thread) post the event 1678 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1679 JvmtiDeferredEventQueue::enqueue( 1680 JvmtiDeferredEvent::compiled_method_load_event(this)); 1681 } 1682} 1683 1684jmethodID nmethod::get_and_cache_jmethod_id() { 1685 if (_jmethod_id == NULL) { 1686 // Cache the jmethod_id since it can no longer be looked up once the 1687 // method itself has been marked for unloading. 1688 _jmethod_id = method()->jmethod_id(); 1689 } 1690 return _jmethod_id; 1691} 1692 1693void nmethod::post_compiled_method_unload() { 1694 if (unload_reported()) { 1695 // During unloading we transition to unloaded and then to zombie 1696 // and the unloading is reported during the first transition. 1697 return; 1698 } 1699 1700 assert(_method != NULL && !is_unloaded(), "just checking"); 1701 DTRACE_METHOD_UNLOAD_PROBE(method()); 1702 1703 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1704 // post the event. Sometime later this nmethod will be made a zombie 1705 // by the sweeper but the Method* will not be valid at that point. 1706 // If the _jmethod_id is null then no load event was ever requested 1707 // so don't bother posting the unload. The main reason for this is 1708 // that the jmethodID is a weak reference to the Method* so if 1709 // it's being unloaded there's no way to look it up since the weak 1710 // ref will have been cleared. 1711 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1712 assert(!unload_reported(), "already unloaded"); 1713 JvmtiDeferredEvent event = 1714 JvmtiDeferredEvent::compiled_method_unload_event(this, 1715 _jmethod_id, insts_begin()); 1716 if (SafepointSynchronize::is_at_safepoint()) { 1717 // Don't want to take the queueing lock. Add it as pending and 1718 // it will get enqueued later. 1719 JvmtiDeferredEventQueue::add_pending_event(event); 1720 } else { 1721 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1722 JvmtiDeferredEventQueue::enqueue(event); 1723 } 1724 } 1725 1726 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1727 // any time. As the nmethod is being unloaded now we mark it has 1728 // having the unload event reported - this will ensure that we don't 1729 // attempt to report the event in the unlikely scenario where the 1730 // event is enabled at the time the nmethod is made a zombie. 1731 set_unload_reported(); 1732} 1733 1734void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1735 if (ic->is_icholder_call()) { 1736 // The only exception is compiledICHolder oops which may 1737 // yet be marked below. (We check this further below). 1738 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1739 1740 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1741 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1742 return; 1743 } 1744 } else { 1745 Metadata* ic_oop = ic->cached_metadata(); 1746 if (ic_oop != NULL) { 1747 if (ic_oop->is_klass()) { 1748 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1749 return; 1750 } 1751 } else if (ic_oop->is_method()) { 1752 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1753 return; 1754 } 1755 } else { 1756 ShouldNotReachHere(); 1757 } 1758 } 1759 } 1760 1761 ic->set_to_clean(); 1762} 1763 1764// This is called at the end of the strong tracing/marking phase of a 1765// GC to unload an nmethod if it contains otherwise unreachable 1766// oops. 1767 1768void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1769 // Make sure the oop's ready to receive visitors 1770 assert(!is_zombie() && !is_unloaded(), 1771 "should not call follow on zombie or unloaded nmethod"); 1772 1773 // If the method is not entrant then a JMP is plastered over the 1774 // first few bytes. If an oop in the old code was there, that oop 1775 // should not get GC'd. Skip the first few bytes of oops on 1776 // not-entrant methods. 1777 address low_boundary = verified_entry_point(); 1778 if (is_not_entrant()) { 1779 low_boundary += NativeJump::instruction_size; 1780 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1781 // (See comment above.) 1782 } 1783 1784 // The RedefineClasses() API can cause the class unloading invariant 1785 // to no longer be true. See jvmtiExport.hpp for details. 1786 // Also, leave a debugging breadcrumb in local flag. 1787 if (JvmtiExport::has_redefined_a_class()) { 1788 // This set of the unloading_occurred flag is done before the 1789 // call to post_compiled_method_unload() so that the unloading 1790 // of this nmethod is reported. 1791 unloading_occurred = true; 1792 } 1793 1794 // Exception cache 1795 clean_exception_cache(is_alive); 1796 1797 // If class unloading occurred we first iterate over all inline caches and 1798 // clear ICs where the cached oop is referring to an unloaded klass or method. 1799 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1800 // iteration below. 1801 if (unloading_occurred) { 1802 RelocIterator iter(this, low_boundary); 1803 while(iter.next()) { 1804 if (iter.type() == relocInfo::virtual_call_type) { 1805 CompiledIC *ic = CompiledIC_at(&iter); 1806 clean_ic_if_metadata_is_dead(ic, is_alive); 1807 } 1808 } 1809 } 1810 1811 // Compiled code 1812 { 1813 RelocIterator iter(this, low_boundary); 1814 while (iter.next()) { 1815 if (iter.type() == relocInfo::oop_type) { 1816 oop_Relocation* r = iter.oop_reloc(); 1817 // In this loop, we must only traverse those oops directly embedded in 1818 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1819 assert(1 == (r->oop_is_immediate()) + 1820 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1821 "oop must be found in exactly one place"); 1822 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1823 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1824 return; 1825 } 1826 } 1827 } 1828 } 1829 } 1830 1831 1832 // Scopes 1833 for (oop* p = oops_begin(); p < oops_end(); p++) { 1834 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1835 if (can_unload(is_alive, p, unloading_occurred)) { 1836 return; 1837 } 1838 } 1839 1840#if INCLUDE_JVMCI 1841 // Follow JVMCI method 1842 BarrierSet* bs = Universe::heap()->barrier_set(); 1843 if (_jvmci_installed_code != NULL) { 1844 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1845 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1846 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 1847 _jvmci_installed_code = NULL; 1848 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 1849 } 1850 } else { 1851 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1852 return; 1853 } 1854 } 1855 } 1856 1857 if (_speculation_log != NULL) { 1858 if (!is_alive->do_object_b(_speculation_log)) { 1859 bs->write_ref_nmethod_pre(&_speculation_log, this); 1860 _speculation_log = NULL; 1861 bs->write_ref_nmethod_post(&_speculation_log, this); 1862 } 1863 } 1864#endif 1865 1866 1867 // Ensure that all metadata is still alive 1868 verify_metadata_loaders(low_boundary, is_alive); 1869} 1870 1871template <class CompiledICorStaticCall> 1872static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1873 // Ok, to lookup references to zombies here 1874 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1875 if (cb != NULL && cb->is_nmethod()) { 1876 nmethod* nm = (nmethod*)cb; 1877 1878 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1879 // The nmethod has not been processed yet. 1880 return true; 1881 } 1882 1883 // Clean inline caches pointing to both zombie and not_entrant methods 1884 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1885 ic->set_to_clean(); 1886 assert(ic->is_clean(), "nmethod " PTR_FORMAT "not clean %s", p2i(from), from->method()->name_and_sig_as_C_string()); 1887 } 1888 } 1889 1890 return false; 1891} 1892 1893static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1894 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1895} 1896 1897static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1898 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1899} 1900 1901bool nmethod::unload_if_dead_at(RelocIterator* iter_at_oop, BoolObjectClosure *is_alive, bool unloading_occurred) { 1902 assert(iter_at_oop->type() == relocInfo::oop_type, "Wrong relocation type"); 1903 1904 oop_Relocation* r = iter_at_oop->oop_reloc(); 1905 // Traverse those oops directly embedded in the code. 1906 // Other oops (oop_index>0) are seen as part of scopes_oops. 1907 assert(1 == (r->oop_is_immediate()) + 1908 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1909 "oop must be found in exactly one place"); 1910 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1911 // Unload this nmethod if the oop is dead. 1912 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1913 return true;; 1914 } 1915 } 1916 1917 return false; 1918} 1919 1920 1921bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1922 ResourceMark rm; 1923 1924 // Make sure the oop's ready to receive visitors 1925 assert(!is_zombie() && !is_unloaded(), 1926 "should not call follow on zombie or unloaded nmethod"); 1927 1928 // If the method is not entrant then a JMP is plastered over the 1929 // first few bytes. If an oop in the old code was there, that oop 1930 // should not get GC'd. Skip the first few bytes of oops on 1931 // not-entrant methods. 1932 address low_boundary = verified_entry_point(); 1933 if (is_not_entrant()) { 1934 low_boundary += NativeJump::instruction_size; 1935 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1936 // (See comment above.) 1937 } 1938 1939 // The RedefineClasses() API can cause the class unloading invariant 1940 // to no longer be true. See jvmtiExport.hpp for details. 1941 // Also, leave a debugging breadcrumb in local flag. 1942 if (JvmtiExport::has_redefined_a_class()) { 1943 // This set of the unloading_occurred flag is done before the 1944 // call to post_compiled_method_unload() so that the unloading 1945 // of this nmethod is reported. 1946 unloading_occurred = true; 1947 } 1948 1949#if INCLUDE_JVMCI 1950 // Follow JVMCI method 1951 if (_jvmci_installed_code != NULL) { 1952 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 1953 if (!is_alive->do_object_b(_jvmci_installed_code)) { 1954 _jvmci_installed_code = NULL; 1955 } 1956 } else { 1957 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 1958 return false; 1959 } 1960 } 1961 } 1962 1963 if (_speculation_log != NULL) { 1964 if (!is_alive->do_object_b(_speculation_log)) { 1965 _speculation_log = NULL; 1966 } 1967 } 1968#endif 1969 1970 // Exception cache 1971 clean_exception_cache(is_alive); 1972 1973 bool is_unloaded = false; 1974 bool postponed = false; 1975 1976 RelocIterator iter(this, low_boundary); 1977 while(iter.next()) { 1978 1979 switch (iter.type()) { 1980 1981 case relocInfo::virtual_call_type: 1982 if (unloading_occurred) { 1983 // If class unloading occurred we first iterate over all inline caches and 1984 // clear ICs where the cached oop is referring to an unloaded klass or method. 1985 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1986 } 1987 1988 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1989 break; 1990 1991 case relocInfo::opt_virtual_call_type: 1992 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1993 break; 1994 1995 case relocInfo::static_call_type: 1996 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1997 break; 1998 1999 case relocInfo::oop_type: 2000 if (!is_unloaded) { 2001 is_unloaded = unload_if_dead_at(&iter, is_alive, unloading_occurred); 2002 } 2003 break; 2004 2005 case relocInfo::metadata_type: 2006 break; // nothing to do. 2007 } 2008 } 2009 2010 if (is_unloaded) { 2011 return postponed; 2012 } 2013 2014 // Scopes 2015 for (oop* p = oops_begin(); p < oops_end(); p++) { 2016 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2017 if (can_unload(is_alive, p, unloading_occurred)) { 2018 is_unloaded = true; 2019 break; 2020 } 2021 } 2022 2023 if (is_unloaded) { 2024 return postponed; 2025 } 2026 2027#if INCLUDE_JVMCI 2028 // Follow JVMCI method 2029 BarrierSet* bs = Universe::heap()->barrier_set(); 2030 if (_jvmci_installed_code != NULL) { 2031 if (_jvmci_installed_code->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(_jvmci_installed_code)) { 2032 if (!is_alive->do_object_b(_jvmci_installed_code)) { 2033 bs->write_ref_nmethod_pre(&_jvmci_installed_code, this); 2034 _jvmci_installed_code = NULL; 2035 bs->write_ref_nmethod_post(&_jvmci_installed_code, this); 2036 } 2037 } else { 2038 if (can_unload(is_alive, (oop*)&_jvmci_installed_code, unloading_occurred)) { 2039 is_unloaded = true; 2040 } 2041 } 2042 } 2043 2044 if (_speculation_log != NULL) { 2045 if (!is_alive->do_object_b(_speculation_log)) { 2046 bs->write_ref_nmethod_pre(&_speculation_log, this); 2047 _speculation_log = NULL; 2048 bs->write_ref_nmethod_post(&_speculation_log, this); 2049 } 2050 } 2051#endif 2052 2053 // Ensure that all metadata is still alive 2054 verify_metadata_loaders(low_boundary, is_alive); 2055 2056 return postponed; 2057} 2058 2059void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 2060 ResourceMark rm; 2061 2062 // Make sure the oop's ready to receive visitors 2063 assert(!is_zombie(), 2064 "should not call follow on zombie nmethod"); 2065 2066 // If the method is not entrant then a JMP is plastered over the 2067 // first few bytes. If an oop in the old code was there, that oop 2068 // should not get GC'd. Skip the first few bytes of oops on 2069 // not-entrant methods. 2070 address low_boundary = verified_entry_point(); 2071 if (is_not_entrant()) { 2072 low_boundary += NativeJump::instruction_size; 2073 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2074 // (See comment above.) 2075 } 2076 2077 RelocIterator iter(this, low_boundary); 2078 while(iter.next()) { 2079 2080 switch (iter.type()) { 2081 2082 case relocInfo::virtual_call_type: 2083 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2084 break; 2085 2086 case relocInfo::opt_virtual_call_type: 2087 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 2088 break; 2089 2090 case relocInfo::static_call_type: 2091 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 2092 break; 2093 } 2094 } 2095} 2096 2097#ifdef ASSERT 2098 2099class CheckClass : AllStatic { 2100 static BoolObjectClosure* _is_alive; 2101 2102 // Check class_loader is alive for this bit of metadata. 2103 static void check_class(Metadata* md) { 2104 Klass* klass = NULL; 2105 if (md->is_klass()) { 2106 klass = ((Klass*)md); 2107 } else if (md->is_method()) { 2108 klass = ((Method*)md)->method_holder(); 2109 } else if (md->is_methodData()) { 2110 klass = ((MethodData*)md)->method()->method_holder(); 2111 } else { 2112 md->print(); 2113 ShouldNotReachHere(); 2114 } 2115 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2116 } 2117 public: 2118 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2119 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2120 _is_alive = is_alive; 2121 nm->metadata_do(check_class); 2122 } 2123}; 2124 2125// This is called during a safepoint so can use static data 2126BoolObjectClosure* CheckClass::_is_alive = NULL; 2127#endif // ASSERT 2128 2129 2130// Processing of oop references should have been sufficient to keep 2131// all strong references alive. Any weak references should have been 2132// cleared as well. Visit all the metadata and ensure that it's 2133// really alive. 2134void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2135#ifdef ASSERT 2136 RelocIterator iter(this, low_boundary); 2137 while (iter.next()) { 2138 // static_stub_Relocations may have dangling references to 2139 // Method*s so trim them out here. Otherwise it looks like 2140 // compiled code is maintaining a link to dead metadata. 2141 address static_call_addr = NULL; 2142 if (iter.type() == relocInfo::opt_virtual_call_type) { 2143 CompiledIC* cic = CompiledIC_at(&iter); 2144 if (!cic->is_call_to_interpreted()) { 2145 static_call_addr = iter.addr(); 2146 } 2147 } else if (iter.type() == relocInfo::static_call_type) { 2148 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2149 if (!csc->is_call_to_interpreted()) { 2150 static_call_addr = iter.addr(); 2151 } 2152 } 2153 if (static_call_addr != NULL) { 2154 RelocIterator sciter(this, low_boundary); 2155 while (sciter.next()) { 2156 if (sciter.type() == relocInfo::static_stub_type && 2157 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2158 sciter.static_stub_reloc()->clear_inline_cache(); 2159 } 2160 } 2161 } 2162 } 2163 // Check that the metadata embedded in the nmethod is alive 2164 CheckClass::do_check_class(is_alive, this); 2165#endif 2166} 2167 2168 2169// Iterate over metadata calling this function. Used by RedefineClasses 2170void nmethod::metadata_do(void f(Metadata*)) { 2171 address low_boundary = verified_entry_point(); 2172 if (is_not_entrant()) { 2173 low_boundary += NativeJump::instruction_size; 2174 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2175 // (See comment above.) 2176 } 2177 { 2178 // Visit all immediate references that are embedded in the instruction stream. 2179 RelocIterator iter(this, low_boundary); 2180 while (iter.next()) { 2181 if (iter.type() == relocInfo::metadata_type ) { 2182 metadata_Relocation* r = iter.metadata_reloc(); 2183 // In this metadata, we must only follow those metadatas directly embedded in 2184 // the code. Other metadatas (oop_index>0) are seen as part of 2185 // the metadata section below. 2186 assert(1 == (r->metadata_is_immediate()) + 2187 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2188 "metadata must be found in exactly one place"); 2189 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2190 Metadata* md = r->metadata_value(); 2191 if (md != _method) f(md); 2192 } 2193 } else if (iter.type() == relocInfo::virtual_call_type) { 2194 // Check compiledIC holders associated with this nmethod 2195 CompiledIC *ic = CompiledIC_at(&iter); 2196 if (ic->is_icholder_call()) { 2197 CompiledICHolder* cichk = ic->cached_icholder(); 2198 f(cichk->holder_method()); 2199 f(cichk->holder_klass()); 2200 } else { 2201 Metadata* ic_oop = ic->cached_metadata(); 2202 if (ic_oop != NULL) { 2203 f(ic_oop); 2204 } 2205 } 2206 } 2207 } 2208 } 2209 2210 // Visit the metadata section 2211 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2212 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2213 Metadata* md = *p; 2214 f(md); 2215 } 2216 2217 // Visit metadata not embedded in the other places. 2218 if (_method != NULL) f(_method); 2219} 2220 2221void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2222 // make sure the oops ready to receive visitors 2223 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2224 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2225 2226 // If the method is not entrant or zombie then a JMP is plastered over the 2227 // first few bytes. If an oop in the old code was there, that oop 2228 // should not get GC'd. Skip the first few bytes of oops on 2229 // not-entrant methods. 2230 address low_boundary = verified_entry_point(); 2231 if (is_not_entrant()) { 2232 low_boundary += NativeJump::instruction_size; 2233 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2234 // (See comment above.) 2235 } 2236 2237#if INCLUDE_JVMCI 2238 if (_jvmci_installed_code != NULL) { 2239 f->do_oop((oop*) &_jvmci_installed_code); 2240 } 2241 if (_speculation_log != NULL) { 2242 f->do_oop((oop*) &_speculation_log); 2243 } 2244#endif 2245 2246 RelocIterator iter(this, low_boundary); 2247 2248 while (iter.next()) { 2249 if (iter.type() == relocInfo::oop_type ) { 2250 oop_Relocation* r = iter.oop_reloc(); 2251 // In this loop, we must only follow those oops directly embedded in 2252 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2253 assert(1 == (r->oop_is_immediate()) + 2254 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2255 "oop must be found in exactly one place"); 2256 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2257 f->do_oop(r->oop_addr()); 2258 } 2259 } 2260 } 2261 2262 // Scopes 2263 // This includes oop constants not inlined in the code stream. 2264 for (oop* p = oops_begin(); p < oops_end(); p++) { 2265 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2266 f->do_oop(p); 2267 } 2268} 2269 2270#define NMETHOD_SENTINEL ((nmethod*)badAddress) 2271 2272nmethod* volatile nmethod::_oops_do_mark_nmethods; 2273 2274// An nmethod is "marked" if its _mark_link is set non-null. 2275// Even if it is the end of the linked list, it will have a non-null link value, 2276// as long as it is on the list. 2277// This code must be MP safe, because it is used from parallel GC passes. 2278bool nmethod::test_set_oops_do_mark() { 2279 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2280 nmethod* observed_mark_link = _oops_do_mark_link; 2281 if (observed_mark_link == NULL) { 2282 // Claim this nmethod for this thread to mark. 2283 observed_mark_link = (nmethod*) 2284 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2285 if (observed_mark_link == NULL) { 2286 2287 // Atomically append this nmethod (now claimed) to the head of the list: 2288 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2289 for (;;) { 2290 nmethod* required_mark_nmethods = observed_mark_nmethods; 2291 _oops_do_mark_link = required_mark_nmethods; 2292 observed_mark_nmethods = (nmethod*) 2293 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2294 if (observed_mark_nmethods == required_mark_nmethods) 2295 break; 2296 } 2297 // Mark was clear when we first saw this guy. 2298 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2299 return false; 2300 } 2301 } 2302 // On fall through, another racing thread marked this nmethod before we did. 2303 return true; 2304} 2305 2306void nmethod::oops_do_marking_prologue() { 2307 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2308 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2309 // We use cmpxchg_ptr instead of regular assignment here because the user 2310 // may fork a bunch of threads, and we need them all to see the same state. 2311 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2312 guarantee(observed == NULL, "no races in this sequential code"); 2313} 2314 2315void nmethod::oops_do_marking_epilogue() { 2316 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2317 nmethod* cur = _oops_do_mark_nmethods; 2318 while (cur != NMETHOD_SENTINEL) { 2319 assert(cur != NULL, "not NULL-terminated"); 2320 nmethod* next = cur->_oops_do_mark_link; 2321 cur->_oops_do_mark_link = NULL; 2322 cur->verify_oop_relocations(); 2323 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2324 cur = next; 2325 } 2326 void* required = _oops_do_mark_nmethods; 2327 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2328 guarantee(observed == required, "no races in this sequential code"); 2329 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2330} 2331 2332class DetectScavengeRoot: public OopClosure { 2333 bool _detected_scavenge_root; 2334public: 2335 DetectScavengeRoot() : _detected_scavenge_root(false) 2336 { NOT_PRODUCT(_print_nm = NULL); } 2337 bool detected_scavenge_root() { return _detected_scavenge_root; } 2338 virtual void do_oop(oop* p) { 2339 if ((*p) != NULL && (*p)->is_scavengable()) { 2340 NOT_PRODUCT(maybe_print(p)); 2341 _detected_scavenge_root = true; 2342 } 2343 } 2344 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2345 2346#ifndef PRODUCT 2347 nmethod* _print_nm; 2348 void maybe_print(oop* p) { 2349 if (_print_nm == NULL) return; 2350 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2351 tty->print_cr("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ")", 2352 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 2353 p2i(*p), p2i(p)); 2354 (*p)->print(); 2355 } 2356#endif //PRODUCT 2357}; 2358 2359bool nmethod::detect_scavenge_root_oops() { 2360 DetectScavengeRoot detect_scavenge_root; 2361 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2362 oops_do(&detect_scavenge_root); 2363 return detect_scavenge_root.detected_scavenge_root(); 2364} 2365 2366// Method that knows how to preserve outgoing arguments at call. This method must be 2367// called with a frame corresponding to a Java invoke 2368void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2369#ifndef SHARK 2370 if (method() != NULL && !method()->is_native()) { 2371 SimpleScopeDesc ssd(this, fr.pc()); 2372 Bytecode_invoke call(ssd.method(), ssd.bci()); 2373 bool has_receiver = call.has_receiver(); 2374 bool has_appendix = call.has_appendix(); 2375 Symbol* signature = call.signature(); 2376 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2377 } 2378#endif // !SHARK 2379} 2380 2381inline bool includes(void* p, void* from, void* to) { 2382 return from <= p && p < to; 2383} 2384 2385 2386void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2387 assert(count >= 2, "must be sentinel values, at least"); 2388 2389#ifdef ASSERT 2390 // must be sorted and unique; we do a binary search in find_pc_desc() 2391 int prev_offset = pcs[0].pc_offset(); 2392 assert(prev_offset == PcDesc::lower_offset_limit, 2393 "must start with a sentinel"); 2394 for (int i = 1; i < count; i++) { 2395 int this_offset = pcs[i].pc_offset(); 2396 assert(this_offset > prev_offset, "offsets must be sorted"); 2397 prev_offset = this_offset; 2398 } 2399 assert(prev_offset == PcDesc::upper_offset_limit, 2400 "must end with a sentinel"); 2401#endif //ASSERT 2402 2403 // Search for MethodHandle invokes and tag the nmethod. 2404 for (int i = 0; i < count; i++) { 2405 if (pcs[i].is_method_handle_invoke()) { 2406 set_has_method_handle_invokes(true); 2407 break; 2408 } 2409 } 2410 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2411 2412 int size = count * sizeof(PcDesc); 2413 assert(scopes_pcs_size() >= size, "oob"); 2414 memcpy(scopes_pcs_begin(), pcs, size); 2415 2416 // Adjust the final sentinel downward. 2417 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2418 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2419 last_pc->set_pc_offset(content_size() + 1); 2420 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2421 // Fill any rounding gaps with copies of the last record. 2422 last_pc[1] = last_pc[0]; 2423 } 2424 // The following assert could fail if sizeof(PcDesc) is not 2425 // an integral multiple of oopSize (the rounding term). 2426 // If it fails, change the logic to always allocate a multiple 2427 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2428 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2429} 2430 2431void nmethod::copy_scopes_data(u_char* buffer, int size) { 2432 assert(scopes_data_size() >= size, "oob"); 2433 memcpy(scopes_data_begin(), buffer, size); 2434} 2435 2436// When using JVMCI the address might be off by the size of a call instruction. 2437bool nmethod::is_deopt_entry(address pc) { 2438 return pc == deopt_handler_begin() 2439#if INCLUDE_JVMCI 2440 || pc == (deopt_handler_begin() + NativeCall::instruction_size) 2441#endif 2442 ; 2443} 2444 2445#ifdef ASSERT 2446static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2447 PcDesc* lower = nm->scopes_pcs_begin(); 2448 PcDesc* upper = nm->scopes_pcs_end(); 2449 lower += 1; // exclude initial sentinel 2450 PcDesc* res = NULL; 2451 for (PcDesc* p = lower; p < upper; p++) { 2452 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2453 if (match_desc(p, pc_offset, approximate)) { 2454 if (res == NULL) 2455 res = p; 2456 else 2457 res = (PcDesc*) badAddress; 2458 } 2459 } 2460 return res; 2461} 2462#endif 2463 2464 2465// Finds a PcDesc with real-pc equal to "pc" 2466PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2467 address base_address = code_begin(); 2468 if ((pc < base_address) || 2469 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2470 return NULL; // PC is wildly out of range 2471 } 2472 int pc_offset = (int) (pc - base_address); 2473 2474 // Check the PcDesc cache if it contains the desired PcDesc 2475 // (This as an almost 100% hit rate.) 2476 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2477 if (res != NULL) { 2478 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2479 return res; 2480 } 2481 2482 // Fallback algorithm: quasi-linear search for the PcDesc 2483 // Find the last pc_offset less than the given offset. 2484 // The successor must be the required match, if there is a match at all. 2485 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2486 PcDesc* lower = scopes_pcs_begin(); 2487 PcDesc* upper = scopes_pcs_end(); 2488 upper -= 1; // exclude final sentinel 2489 if (lower >= upper) return NULL; // native method; no PcDescs at all 2490 2491#define assert_LU_OK \ 2492 /* invariant on lower..upper during the following search: */ \ 2493 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2494 assert(upper->pc_offset() >= pc_offset, "sanity") 2495 assert_LU_OK; 2496 2497 // Use the last successful return as a split point. 2498 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2499 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2500 if (mid->pc_offset() < pc_offset) { 2501 lower = mid; 2502 } else { 2503 upper = mid; 2504 } 2505 2506 // Take giant steps at first (4096, then 256, then 16, then 1) 2507 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2508 const int RADIX = (1 << LOG2_RADIX); 2509 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2510 while ((mid = lower + step) < upper) { 2511 assert_LU_OK; 2512 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2513 if (mid->pc_offset() < pc_offset) { 2514 lower = mid; 2515 } else { 2516 upper = mid; 2517 break; 2518 } 2519 } 2520 assert_LU_OK; 2521 } 2522 2523 // Sneak up on the value with a linear search of length ~16. 2524 while (true) { 2525 assert_LU_OK; 2526 mid = lower + 1; 2527 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 2528 if (mid->pc_offset() < pc_offset) { 2529 lower = mid; 2530 } else { 2531 upper = mid; 2532 break; 2533 } 2534 } 2535#undef assert_LU_OK 2536 2537 if (match_desc(upper, pc_offset, approximate)) { 2538 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2539 _pc_desc_cache.add_pc_desc(upper); 2540 return upper; 2541 } else { 2542 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2543 return NULL; 2544 } 2545} 2546 2547 2548void nmethod::check_all_dependencies(DepChange& changes) { 2549 // Checked dependencies are allocated into this ResourceMark 2550 ResourceMark rm; 2551 2552 // Turn off dependency tracing while actually testing dependencies. 2553 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 2554 2555 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 2556 &DependencySignature::equals, 11027> DepTable; 2557 2558 DepTable* table = new DepTable(); 2559 2560 // Iterate over live nmethods and check dependencies of all nmethods that are not 2561 // marked for deoptimization. A particular dependency is only checked once. 2562 NMethodIterator iter; 2563 while(iter.next()) { 2564 nmethod* nm = iter.method(); 2565 // Only notify for live nmethods 2566 if (nm->is_alive() && !nm->is_marked_for_deoptimization()) { 2567 for (Dependencies::DepStream deps(nm); deps.next(); ) { 2568 // Construct abstraction of a dependency. 2569 DependencySignature* current_sig = new DependencySignature(deps); 2570 2571 // Determine if dependency is already checked. table->put(...) returns 2572 // 'true' if the dependency is added (i.e., was not in the hashtable). 2573 if (table->put(*current_sig, 1)) { 2574 if (deps.check_dependency() != NULL) { 2575 // Dependency checking failed. Print out information about the failed 2576 // dependency and finally fail with an assert. We can fail here, since 2577 // dependency checking is never done in a product build. 2578 tty->print_cr("Failed dependency:"); 2579 changes.print(); 2580 nm->print(); 2581 nm->print_dependencies(); 2582 assert(false, "Should have been marked for deoptimization"); 2583 } 2584 } 2585 } 2586 } 2587 } 2588} 2589 2590bool nmethod::check_dependency_on(DepChange& changes) { 2591 // What has happened: 2592 // 1) a new class dependee has been added 2593 // 2) dependee and all its super classes have been marked 2594 bool found_check = false; // set true if we are upset 2595 for (Dependencies::DepStream deps(this); deps.next(); ) { 2596 // Evaluate only relevant dependencies. 2597 if (deps.spot_check_dependency_at(changes) != NULL) { 2598 found_check = true; 2599 NOT_DEBUG(break); 2600 } 2601 } 2602 return found_check; 2603} 2604 2605bool nmethod::is_evol_dependent_on(Klass* dependee) { 2606 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2607 Array<Method*>* dependee_methods = dependee_ik->methods(); 2608 for (Dependencies::DepStream deps(this); deps.next(); ) { 2609 if (deps.type() == Dependencies::evol_method) { 2610 Method* method = deps.method_argument(0); 2611 for (int j = 0; j < dependee_methods->length(); j++) { 2612 if (dependee_methods->at(j) == method) { 2613 // RC_TRACE macro has an embedded ResourceMark 2614 RC_TRACE(0x01000000, 2615 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2616 _method->method_holder()->external_name(), 2617 _method->name()->as_C_string(), 2618 _method->signature()->as_C_string(), compile_id(), 2619 method->method_holder()->external_name(), 2620 method->name()->as_C_string(), 2621 method->signature()->as_C_string())); 2622 if (TraceDependencies || LogCompilation) 2623 deps.log_dependency(dependee); 2624 return true; 2625 } 2626 } 2627 } 2628 } 2629 return false; 2630} 2631 2632// Called from mark_for_deoptimization, when dependee is invalidated. 2633bool nmethod::is_dependent_on_method(Method* dependee) { 2634 for (Dependencies::DepStream deps(this); deps.next(); ) { 2635 if (deps.type() != Dependencies::evol_method) 2636 continue; 2637 Method* method = deps.method_argument(0); 2638 if (method == dependee) return true; 2639 } 2640 return false; 2641} 2642 2643 2644bool nmethod::is_patchable_at(address instr_addr) { 2645 assert(insts_contains(instr_addr), "wrong nmethod used"); 2646 if (is_zombie()) { 2647 // a zombie may never be patched 2648 return false; 2649 } 2650 return true; 2651} 2652 2653 2654address nmethod::continuation_for_implicit_exception(address pc) { 2655 // Exception happened outside inline-cache check code => we are inside 2656 // an active nmethod => use cpc to determine a return address 2657 int exception_offset = pc - code_begin(); 2658 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2659#ifdef ASSERT 2660 if (cont_offset == 0) { 2661 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2662 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2663 HandleMark hm(thread); 2664 ResourceMark rm(thread); 2665 CodeBlob* cb = CodeCache::find_blob(pc); 2666 assert(cb != NULL && cb == this, ""); 2667 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2668 print(); 2669 method()->print_codes(); 2670 print_code(); 2671 print_pcs(); 2672 } 2673#endif 2674 if (cont_offset == 0) { 2675 // Let the normal error handling report the exception 2676 return NULL; 2677 } 2678 return code_begin() + cont_offset; 2679} 2680 2681 2682 2683void nmethod_init() { 2684 // make sure you didn't forget to adjust the filler fields 2685 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2686} 2687 2688 2689//------------------------------------------------------------------------------------------- 2690 2691 2692// QQQ might we make this work from a frame?? 2693nmethodLocker::nmethodLocker(address pc) { 2694 CodeBlob* cb = CodeCache::find_blob(pc); 2695 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2696 _nm = (nmethod*)cb; 2697 lock_nmethod(_nm); 2698} 2699 2700// Only JvmtiDeferredEvent::compiled_method_unload_event() 2701// should pass zombie_ok == true. 2702void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2703 if (nm == NULL) return; 2704 Atomic::inc(&nm->_lock_count); 2705 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2706} 2707 2708void nmethodLocker::unlock_nmethod(nmethod* nm) { 2709 if (nm == NULL) return; 2710 Atomic::dec(&nm->_lock_count); 2711 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2712} 2713 2714// ----------------------------------------------------------------------------- 2715// nmethod::get_deopt_original_pc 2716// 2717// Return the original PC for the given PC if: 2718// (a) the given PC belongs to a nmethod and 2719// (b) it is a deopt PC 2720address nmethod::get_deopt_original_pc(const frame* fr) { 2721 if (fr->cb() == NULL) return NULL; 2722 2723 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2724 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2725 return nm->get_original_pc(fr); 2726 2727 return NULL; 2728} 2729 2730 2731// ----------------------------------------------------------------------------- 2732// MethodHandle 2733 2734bool nmethod::is_method_handle_return(address return_pc) { 2735 if (!has_method_handle_invokes()) return false; 2736 PcDesc* pd = pc_desc_at(return_pc); 2737 if (pd == NULL) 2738 return false; 2739 return pd->is_method_handle_invoke(); 2740} 2741 2742 2743// ----------------------------------------------------------------------------- 2744// Verification 2745 2746class VerifyOopsClosure: public OopClosure { 2747 nmethod* _nm; 2748 bool _ok; 2749public: 2750 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2751 bool ok() { return _ok; } 2752 virtual void do_oop(oop* p) { 2753 if ((*p) == NULL || (*p)->is_oop()) return; 2754 if (_ok) { 2755 _nm->print_nmethod(true); 2756 _ok = false; 2757 } 2758 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2759 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2760 } 2761 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2762}; 2763 2764void nmethod::verify() { 2765 2766 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2767 // seems odd. 2768 2769 if (is_zombie() || is_not_entrant() || is_unloaded()) 2770 return; 2771 2772 // Make sure all the entry points are correctly aligned for patching. 2773 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2774 2775 // assert(method()->is_oop(), "must be valid"); 2776 2777 ResourceMark rm; 2778 2779 if (!CodeCache::contains(this)) { 2780 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2781 } 2782 2783 if(is_native_method() ) 2784 return; 2785 2786 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2787 if (nm != this) { 2788 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2789 } 2790 2791 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2792 if (! p->verify(this)) { 2793 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2794 } 2795 } 2796 2797 VerifyOopsClosure voc(this); 2798 oops_do(&voc); 2799 assert(voc.ok(), "embedded oops must be OK"); 2800 verify_scavenge_root_oops(); 2801 2802 verify_scopes(); 2803} 2804 2805 2806void nmethod::verify_interrupt_point(address call_site) { 2807 // Verify IC only when nmethod installation is finished. 2808 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2809 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2810 if (is_installed) { 2811 Thread *cur = Thread::current(); 2812 if (CompiledIC_lock->owner() == cur || 2813 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2814 SafepointSynchronize::is_at_safepoint())) { 2815 CompiledIC_at(this, call_site); 2816 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2817 } else { 2818 MutexLocker ml_verify (CompiledIC_lock); 2819 CompiledIC_at(this, call_site); 2820 } 2821 } 2822 2823 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2824 assert(pd != NULL, "PcDesc must exist"); 2825 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2826 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2827 pd->return_oop()); 2828 !sd->is_top(); sd = sd->sender()) { 2829 sd->verify(); 2830 } 2831} 2832 2833void nmethod::verify_scopes() { 2834 if( !method() ) return; // Runtime stubs have no scope 2835 if (method()->is_native()) return; // Ignore stub methods. 2836 // iterate through all interrupt point 2837 // and verify the debug information is valid. 2838 RelocIterator iter((nmethod*)this); 2839 while (iter.next()) { 2840 address stub = NULL; 2841 switch (iter.type()) { 2842 case relocInfo::virtual_call_type: 2843 verify_interrupt_point(iter.addr()); 2844 break; 2845 case relocInfo::opt_virtual_call_type: 2846 stub = iter.opt_virtual_call_reloc()->static_stub(); 2847 verify_interrupt_point(iter.addr()); 2848 break; 2849 case relocInfo::static_call_type: 2850 stub = iter.static_call_reloc()->static_stub(); 2851 //verify_interrupt_point(iter.addr()); 2852 break; 2853 case relocInfo::runtime_call_type: 2854 address destination = iter.reloc()->value(); 2855 // Right now there is no way to find out which entries support 2856 // an interrupt point. It would be nice if we had this 2857 // information in a table. 2858 break; 2859 } 2860 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2861 } 2862} 2863 2864 2865// ----------------------------------------------------------------------------- 2866// Non-product code 2867#ifndef PRODUCT 2868 2869class DebugScavengeRoot: public OopClosure { 2870 nmethod* _nm; 2871 bool _ok; 2872public: 2873 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2874 bool ok() { return _ok; } 2875 virtual void do_oop(oop* p) { 2876 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2877 if (_ok) { 2878 _nm->print_nmethod(true); 2879 _ok = false; 2880 } 2881 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2882 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2883 (*p)->print(); 2884 } 2885 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2886}; 2887 2888void nmethod::verify_scavenge_root_oops() { 2889 if (UseG1GC) { 2890 return; 2891 } 2892 2893 if (!on_scavenge_root_list()) { 2894 // Actually look inside, to verify the claim that it's clean. 2895 DebugScavengeRoot debug_scavenge_root(this); 2896 oops_do(&debug_scavenge_root); 2897 if (!debug_scavenge_root.ok()) 2898 fatal("found an unadvertised bad scavengable oop in the code cache"); 2899 } 2900 assert(scavenge_root_not_marked(), ""); 2901} 2902 2903#endif // PRODUCT 2904 2905// Printing operations 2906 2907void nmethod::print() const { 2908 ResourceMark rm; 2909 ttyLocker ttyl; // keep the following output all in one block 2910 2911 tty->print("Compiled method "); 2912 2913 if (is_compiled_by_c1()) { 2914 tty->print("(c1) "); 2915 } else if (is_compiled_by_c2()) { 2916 tty->print("(c2) "); 2917 } else if (is_compiled_by_shark()) { 2918 tty->print("(shark) "); 2919 } else if (is_compiled_by_jvmci()) { 2920 tty->print("(JVMCI) "); 2921 } else { 2922 tty->print("(nm) "); 2923 } 2924 2925 print_on(tty, NULL); 2926 2927 if (WizardMode) { 2928 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2929 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2930 tty->print(" { "); 2931 if (is_in_use()) tty->print("in_use "); 2932 if (is_not_entrant()) tty->print("not_entrant "); 2933 if (is_zombie()) tty->print("zombie "); 2934 if (is_unloaded()) tty->print("unloaded "); 2935 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2936 tty->print_cr("}:"); 2937 } 2938 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2939 p2i(this), 2940 p2i(this) + size(), 2941 size()); 2942 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2943 p2i(relocation_begin()), 2944 p2i(relocation_end()), 2945 relocation_size()); 2946 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2947 p2i(consts_begin()), 2948 p2i(consts_end()), 2949 consts_size()); 2950 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2951 p2i(insts_begin()), 2952 p2i(insts_end()), 2953 insts_size()); 2954 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2955 p2i(stub_begin()), 2956 p2i(stub_end()), 2957 stub_size()); 2958 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2959 p2i(oops_begin()), 2960 p2i(oops_end()), 2961 oops_size()); 2962 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2963 p2i(metadata_begin()), 2964 p2i(metadata_end()), 2965 metadata_size()); 2966 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2967 p2i(scopes_data_begin()), 2968 p2i(scopes_data_end()), 2969 scopes_data_size()); 2970 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2971 p2i(scopes_pcs_begin()), 2972 p2i(scopes_pcs_end()), 2973 scopes_pcs_size()); 2974 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2975 p2i(dependencies_begin()), 2976 p2i(dependencies_end()), 2977 dependencies_size()); 2978 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2979 p2i(handler_table_begin()), 2980 p2i(handler_table_end()), 2981 handler_table_size()); 2982 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2983 p2i(nul_chk_table_begin()), 2984 p2i(nul_chk_table_end()), 2985 nul_chk_table_size()); 2986} 2987 2988void nmethod::print_code() { 2989 HandleMark hm; 2990 ResourceMark m; 2991 Disassembler::decode(this); 2992} 2993 2994 2995#ifndef PRODUCT 2996 2997void nmethod::print_scopes() { 2998 // Find the first pc desc for all scopes in the code and print it. 2999 ResourceMark rm; 3000 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3001 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 3002 continue; 3003 3004 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 3005 while (sd != NULL) { 3006 sd->print_on(tty, p); 3007 sd = sd->sender(); 3008 } 3009 } 3010} 3011 3012void nmethod::print_dependencies() { 3013 ResourceMark rm; 3014 ttyLocker ttyl; // keep the following output all in one block 3015 tty->print_cr("Dependencies:"); 3016 for (Dependencies::DepStream deps(this); deps.next(); ) { 3017 deps.print_dependency(); 3018 Klass* ctxk = deps.context_type(); 3019 if (ctxk != NULL) { 3020 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 3021 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 3022 } 3023 } 3024 deps.log_dependency(); // put it into the xml log also 3025 } 3026} 3027 3028 3029void nmethod::print_relocations() { 3030 ResourceMark m; // in case methods get printed via the debugger 3031 tty->print_cr("relocations:"); 3032 RelocIterator iter(this); 3033 iter.print(); 3034 if (UseRelocIndex) { 3035 jint* index_end = (jint*)relocation_end() - 1; 3036 jint index_size = *index_end; 3037 jint* index_start = (jint*)( (address)index_end - index_size ); 3038 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", p2i(index_start), index_size); 3039 if (index_size > 0) { 3040 jint* ip; 3041 for (ip = index_start; ip+2 <= index_end; ip += 2) 3042 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 3043 ip[0], 3044 ip[1], 3045 p2i(header_end()+ip[0]), 3046 p2i(relocation_begin()-1+ip[1])); 3047 for (; ip < index_end; ip++) 3048 tty->print_cr(" (%d ?)", ip[0]); 3049 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", p2i(ip), *ip); 3050 ip++; 3051 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", p2i(ip)); 3052 } 3053 } 3054} 3055 3056 3057void nmethod::print_pcs() { 3058 ResourceMark m; // in case methods get printed via debugger 3059 tty->print_cr("pc-bytecode offsets:"); 3060 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 3061 p->print(this); 3062 } 3063} 3064 3065#endif // PRODUCT 3066 3067const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 3068 RelocIterator iter(this, begin, end); 3069 bool have_one = false; 3070 while (iter.next()) { 3071 have_one = true; 3072 switch (iter.type()) { 3073 case relocInfo::none: return "no_reloc"; 3074 case relocInfo::oop_type: { 3075 stringStream st; 3076 oop_Relocation* r = iter.oop_reloc(); 3077 oop obj = r->oop_value(); 3078 st.print("oop("); 3079 if (obj == NULL) st.print("NULL"); 3080 else obj->print_value_on(&st); 3081 st.print(")"); 3082 return st.as_string(); 3083 } 3084 case relocInfo::metadata_type: { 3085 stringStream st; 3086 metadata_Relocation* r = iter.metadata_reloc(); 3087 Metadata* obj = r->metadata_value(); 3088 st.print("metadata("); 3089 if (obj == NULL) st.print("NULL"); 3090 else obj->print_value_on(&st); 3091 st.print(")"); 3092 return st.as_string(); 3093 } 3094 case relocInfo::runtime_call_type: { 3095 stringStream st; 3096 st.print("runtime_call"); 3097 runtime_call_Relocation* r = iter.runtime_call_reloc(); 3098 address dest = r->destination(); 3099 CodeBlob* cb = CodeCache::find_blob(dest); 3100 if (cb != NULL) { 3101 st.print(" %s", cb->name()); 3102 } 3103 return st.as_string(); 3104 } 3105 case relocInfo::virtual_call_type: return "virtual_call"; 3106 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 3107 case relocInfo::static_call_type: return "static_call"; 3108 case relocInfo::static_stub_type: return "static_stub"; 3109 case relocInfo::external_word_type: return "external_word"; 3110 case relocInfo::internal_word_type: return "internal_word"; 3111 case relocInfo::section_word_type: return "section_word"; 3112 case relocInfo::poll_type: return "poll"; 3113 case relocInfo::poll_return_type: return "poll_return"; 3114 case relocInfo::type_mask: return "type_bit_mask"; 3115 } 3116 } 3117 return have_one ? "other" : NULL; 3118} 3119 3120// Return a the last scope in (begin..end] 3121ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 3122 PcDesc* p = pc_desc_near(begin+1); 3123 if (p != NULL && p->real_pc(this) <= end) { 3124 return new ScopeDesc(this, p->scope_decode_offset(), 3125 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 3126 p->return_oop()); 3127 } 3128 return NULL; 3129} 3130 3131void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 3132 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 3133 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 3134 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 3135 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 3136 if (JVMCI_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 3137 3138 if (has_method_handle_invokes()) 3139 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 3140 3141 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 3142 3143 if (block_begin == entry_point()) { 3144 methodHandle m = method(); 3145 if (m.not_null()) { 3146 stream->print(" # "); 3147 m->print_value_on(stream); 3148 stream->cr(); 3149 } 3150 if (m.not_null() && !is_osr_method()) { 3151 ResourceMark rm; 3152 int sizeargs = m->size_of_parameters(); 3153 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3154 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3155 { 3156 int sig_index = 0; 3157 if (!m->is_static()) 3158 sig_bt[sig_index++] = T_OBJECT; // 'this' 3159 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3160 BasicType t = ss.type(); 3161 sig_bt[sig_index++] = t; 3162 if (type2size[t] == 2) { 3163 sig_bt[sig_index++] = T_VOID; 3164 } else { 3165 assert(type2size[t] == 1, "size is 1 or 2"); 3166 } 3167 } 3168 assert(sig_index == sizeargs, ""); 3169 } 3170 const char* spname = "sp"; // make arch-specific? 3171 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3172 int stack_slot_offset = this->frame_size() * wordSize; 3173 int tab1 = 14, tab2 = 24; 3174 int sig_index = 0; 3175 int arg_index = (m->is_static() ? 0 : -1); 3176 bool did_old_sp = false; 3177 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3178 bool at_this = (arg_index == -1); 3179 bool at_old_sp = false; 3180 BasicType t = (at_this ? T_OBJECT : ss.type()); 3181 assert(t == sig_bt[sig_index], "sigs in sync"); 3182 if (at_this) 3183 stream->print(" # this: "); 3184 else 3185 stream->print(" # parm%d: ", arg_index); 3186 stream->move_to(tab1); 3187 VMReg fst = regs[sig_index].first(); 3188 VMReg snd = regs[sig_index].second(); 3189 if (fst->is_reg()) { 3190 stream->print("%s", fst->name()); 3191 if (snd->is_valid()) { 3192 stream->print(":%s", snd->name()); 3193 } 3194 } else if (fst->is_stack()) { 3195 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3196 if (offset == stack_slot_offset) at_old_sp = true; 3197 stream->print("[%s+0x%x]", spname, offset); 3198 } else { 3199 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3200 } 3201 stream->print(" "); 3202 stream->move_to(tab2); 3203 stream->print("= "); 3204 if (at_this) { 3205 m->method_holder()->print_value_on(stream); 3206 } else { 3207 bool did_name = false; 3208 if (!at_this && ss.is_object()) { 3209 Symbol* name = ss.as_symbol_or_null(); 3210 if (name != NULL) { 3211 name->print_value_on(stream); 3212 did_name = true; 3213 } 3214 } 3215 if (!did_name) 3216 stream->print("%s", type2name(t)); 3217 } 3218 if (at_old_sp) { 3219 stream->print(" (%s of caller)", spname); 3220 did_old_sp = true; 3221 } 3222 stream->cr(); 3223 sig_index += type2size[t]; 3224 arg_index += 1; 3225 if (!at_this) ss.next(); 3226 } 3227 if (!did_old_sp) { 3228 stream->print(" # "); 3229 stream->move_to(tab1); 3230 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3231 stream->print(" (%s of caller)", spname); 3232 stream->cr(); 3233 } 3234 } 3235 } 3236} 3237 3238void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3239 // First, find an oopmap in (begin, end]. 3240 // We use the odd half-closed interval so that oop maps and scope descs 3241 // which are tied to the byte after a call are printed with the call itself. 3242 address base = code_begin(); 3243 ImmutableOopMapSet* oms = oop_maps(); 3244 if (oms != NULL) { 3245 for (int i = 0, imax = oms->count(); i < imax; i++) { 3246 const ImmutableOopMapPair* pair = oms->pair_at(i); 3247 const ImmutableOopMap* om = pair->get_from(oms); 3248 address pc = base + pair->pc_offset(); 3249 if (pc > begin) { 3250 if (pc <= end) { 3251 st->move_to(column); 3252 st->print("; "); 3253 om->print_on(st); 3254 } 3255 break; 3256 } 3257 } 3258 } 3259 3260 // Print any debug info present at this pc. 3261 ScopeDesc* sd = scope_desc_in(begin, end); 3262 if (sd != NULL) { 3263 st->move_to(column); 3264 if (sd->bci() == SynchronizationEntryBCI) { 3265 st->print(";*synchronization entry"); 3266 } else { 3267 if (sd->method() == NULL) { 3268 st->print("method is NULL"); 3269 } else if (sd->method()->is_native()) { 3270 st->print("method is native"); 3271 } else { 3272 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3273 st->print(";*%s", Bytecodes::name(bc)); 3274 switch (bc) { 3275 case Bytecodes::_invokevirtual: 3276 case Bytecodes::_invokespecial: 3277 case Bytecodes::_invokestatic: 3278 case Bytecodes::_invokeinterface: 3279 { 3280 Bytecode_invoke invoke(sd->method(), sd->bci()); 3281 st->print(" "); 3282 if (invoke.name() != NULL) 3283 invoke.name()->print_symbol_on(st); 3284 else 3285 st->print("<UNKNOWN>"); 3286 break; 3287 } 3288 case Bytecodes::_getfield: 3289 case Bytecodes::_putfield: 3290 case Bytecodes::_getstatic: 3291 case Bytecodes::_putstatic: 3292 { 3293 Bytecode_field field(sd->method(), sd->bci()); 3294 st->print(" "); 3295 if (field.name() != NULL) 3296 field.name()->print_symbol_on(st); 3297 else 3298 st->print("<UNKNOWN>"); 3299 } 3300 } 3301 } 3302 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 3303 } 3304 3305 // Print all scopes 3306 for (;sd != NULL; sd = sd->sender()) { 3307 st->move_to(column); 3308 st->print("; -"); 3309 if (sd->method() == NULL) { 3310 st->print("method is NULL"); 3311 } else { 3312 sd->method()->print_short_name(st); 3313 } 3314 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3315 if (lineno != -1) { 3316 st->print("@%d (line %d)", sd->bci(), lineno); 3317 } else { 3318 st->print("@%d", sd->bci()); 3319 } 3320 st->cr(); 3321 } 3322 } 3323 3324 // Print relocation information 3325 const char* str = reloc_string_for(begin, end); 3326 if (str != NULL) { 3327 if (sd != NULL) st->cr(); 3328 st->move_to(column); 3329 st->print("; {%s}", str); 3330 } 3331 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3332 if (cont_offset != 0) { 3333 st->move_to(column); 3334 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 3335 } 3336 3337} 3338 3339#ifndef PRODUCT 3340 3341void nmethod::print_value_on(outputStream* st) const { 3342 st->print("nmethod"); 3343 print_on(st, NULL); 3344} 3345 3346void nmethod::print_calls(outputStream* st) { 3347 RelocIterator iter(this); 3348 while (iter.next()) { 3349 switch (iter.type()) { 3350 case relocInfo::virtual_call_type: 3351 case relocInfo::opt_virtual_call_type: { 3352 VerifyMutexLocker mc(CompiledIC_lock); 3353 CompiledIC_at(&iter)->print(); 3354 break; 3355 } 3356 case relocInfo::static_call_type: 3357 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 3358 compiledStaticCall_at(iter.reloc())->print(); 3359 break; 3360 } 3361 } 3362} 3363 3364void nmethod::print_handler_table() { 3365 ExceptionHandlerTable(this).print(); 3366} 3367 3368void nmethod::print_nul_chk_table() { 3369 ImplicitExceptionTable(this).print(code_begin()); 3370} 3371 3372void nmethod::print_statistics() { 3373 ttyLocker ttyl; 3374 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3375 native_nmethod_stats.print_native_nmethod_stats(); 3376#ifdef COMPILER1 3377 c1_java_nmethod_stats.print_nmethod_stats("C1"); 3378#endif 3379#ifdef COMPILER2 3380 c2_java_nmethod_stats.print_nmethod_stats("C2"); 3381#endif 3382#if INCLUDE_JVMCI 3383 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 3384#endif 3385#ifdef SHARK 3386 shark_java_nmethod_stats.print_nmethod_stats("Shark"); 3387#endif 3388 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 3389 DebugInformationRecorder::print_statistics(); 3390#ifndef PRODUCT 3391 pc_nmethod_stats.print_pc_stats(); 3392#endif 3393 Dependencies::print_statistics(); 3394 if (xtty != NULL) xtty->tail("statistics"); 3395} 3396 3397#endif // !PRODUCT 3398 3399#if INCLUDE_JVMCI 3400char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) { 3401 if (!this->is_compiled_by_jvmci()) { 3402 return NULL; 3403 } 3404 oop installedCode = this->jvmci_installed_code(); 3405 if (installedCode != NULL) { 3406 oop installedCodeName = NULL; 3407 if (installedCode->is_a(InstalledCode::klass())) { 3408 installedCodeName = InstalledCode::name(installedCode); 3409 } 3410 if (installedCodeName != NULL) { 3411 return java_lang_String::as_utf8_string(installedCodeName, buf, (int)buflen); 3412 } else { 3413 jio_snprintf(buf, buflen, "null"); 3414 return buf; 3415 } 3416 } 3417 jio_snprintf(buf, buflen, "noInstalledCode"); 3418 return buf; 3419} 3420#endif 3421