1 /* 2 * Copyright (c) 1997, 2018, 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 "jvm.h" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/compiledMethod.inline.hpp" 30 #include "code/dependencies.hpp" 31 #include "code/nativeInst.hpp" 32 #include "code/nmethod.hpp" 33 #include "code/scopeDesc.hpp" 34 #include "compiler/abstractCompiler.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "compiler/compileLog.hpp" 37 #include "compiler/compilerDirectives.hpp" 38 #include "compiler/directivesParser.hpp" 39 #include "compiler/disassembler.hpp" 40 #include "interpreter/bytecode.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "oops/access.inline.hpp" 46 #include "oops/method.inline.hpp" 47 #include "oops/methodData.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/jvmtiImpl.hpp" 50 #include "runtime/atomic.hpp" 51 #include "runtime/flags/flagSetting.hpp" 52 #include "runtime/frame.inline.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/jniHandles.inline.hpp" 55 #include "runtime/orderAccess.hpp" 56 #include "runtime/os.hpp" 57 #include "runtime/safepointVerifiers.hpp" 58 #include "runtime/sharedRuntime.hpp" 59 #include "runtime/sweeper.hpp" 60 #include "runtime/vmThread.hpp" 61 #include "utilities/align.hpp" 62 #include "utilities/dtrace.hpp" 63 #include "utilities/events.hpp" 64 #include "utilities/resourceHash.hpp" 65 #include "utilities/xmlstream.hpp" 66 #if INCLUDE_JVMCI 67 #include "jvmci/jvmciJavaClasses.hpp" 68 #endif 69 70 #ifdef DTRACE_ENABLED 71 72 // Only bother with this argument setup if dtrace is available 73 74 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 75 { \ 76 Method* m = (method); \ 77 if (m != NULL) { \ 78 Symbol* klass_name = m->klass_name(); \ 79 Symbol* name = m->name(); \ 80 Symbol* signature = m->signature(); \ 81 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 82 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 83 (char *) name->bytes(), name->utf8_length(), \ 84 (char *) signature->bytes(), signature->utf8_length()); \ 85 } \ 86 } 87 88 #else // ndef DTRACE_ENABLED 89 90 #define DTRACE_METHOD_UNLOAD_PROBE(method) 91 92 #endif 93 94 //--------------------------------------------------------------------------------- 95 // NMethod statistics 96 // They are printed under various flags, including: 97 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 98 // (In the latter two cases, they like other stats are printed to the log only.) 99 100 #ifndef PRODUCT 101 // These variables are put into one block to reduce relocations 102 // and make it simpler to print from the debugger. 103 struct java_nmethod_stats_struct { 104 int nmethod_count; 105 int total_size; 106 int relocation_size; 107 int consts_size; 108 int insts_size; 109 int stub_size; 110 int scopes_data_size; 111 int scopes_pcs_size; 112 int dependencies_size; 113 int handler_table_size; 114 int nul_chk_table_size; 115 int oops_size; 116 int metadata_size; 117 118 void note_nmethod(nmethod* nm) { 119 nmethod_count += 1; 120 total_size += nm->size(); 121 relocation_size += nm->relocation_size(); 122 consts_size += nm->consts_size(); 123 insts_size += nm->insts_size(); 124 stub_size += nm->stub_size(); 125 oops_size += nm->oops_size(); 126 metadata_size += nm->metadata_size(); 127 scopes_data_size += nm->scopes_data_size(); 128 scopes_pcs_size += nm->scopes_pcs_size(); 129 dependencies_size += nm->dependencies_size(); 130 handler_table_size += nm->handler_table_size(); 131 nul_chk_table_size += nm->nul_chk_table_size(); 132 } 133 void print_nmethod_stats(const char* name) { 134 if (nmethod_count == 0) return; 135 tty->print_cr("Statistics for %d bytecoded nmethods for %s:", nmethod_count, name); 136 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 137 if (nmethod_count != 0) tty->print_cr(" header = " SIZE_FORMAT, nmethod_count * sizeof(nmethod)); 138 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 139 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 140 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 141 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 142 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 143 if (metadata_size != 0) tty->print_cr(" metadata = %d", metadata_size); 144 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 145 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 146 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 147 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 148 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 149 } 150 }; 151 152 struct native_nmethod_stats_struct { 153 int native_nmethod_count; 154 int native_total_size; 155 int native_relocation_size; 156 int native_insts_size; 157 int native_oops_size; 158 int native_metadata_size; 159 void note_native_nmethod(nmethod* nm) { 160 native_nmethod_count += 1; 161 native_total_size += nm->size(); 162 native_relocation_size += nm->relocation_size(); 163 native_insts_size += nm->insts_size(); 164 native_oops_size += nm->oops_size(); 165 native_metadata_size += nm->metadata_size(); 166 } 167 void print_native_nmethod_stats() { 168 if (native_nmethod_count == 0) return; 169 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 170 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 171 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 172 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 173 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 174 if (native_metadata_size != 0) tty->print_cr(" N. metadata = %d", native_metadata_size); 175 } 176 }; 177 178 struct pc_nmethod_stats_struct { 179 int pc_desc_resets; // number of resets (= number of caches) 180 int pc_desc_queries; // queries to nmethod::find_pc_desc 181 int pc_desc_approx; // number of those which have approximate true 182 int pc_desc_repeats; // number of _pc_descs[0] hits 183 int pc_desc_hits; // number of LRU cache hits 184 int pc_desc_tests; // total number of PcDesc examinations 185 int pc_desc_searches; // total number of quasi-binary search steps 186 int pc_desc_adds; // number of LUR cache insertions 187 188 void print_pc_stats() { 189 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 190 pc_desc_queries, 191 (double)(pc_desc_tests + pc_desc_searches) 192 / pc_desc_queries); 193 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 194 pc_desc_resets, 195 pc_desc_queries, pc_desc_approx, 196 pc_desc_repeats, pc_desc_hits, 197 pc_desc_tests, pc_desc_searches, pc_desc_adds); 198 } 199 }; 200 201 #ifdef COMPILER1 202 static java_nmethod_stats_struct c1_java_nmethod_stats; 203 #endif 204 #ifdef COMPILER2 205 static java_nmethod_stats_struct c2_java_nmethod_stats; 206 #endif 207 #if INCLUDE_JVMCI 208 static java_nmethod_stats_struct jvmci_java_nmethod_stats; 209 #endif 210 static java_nmethod_stats_struct unknown_java_nmethod_stats; 211 212 static native_nmethod_stats_struct native_nmethod_stats; 213 static pc_nmethod_stats_struct pc_nmethod_stats; 214 215 static void note_java_nmethod(nmethod* nm) { 216 #ifdef COMPILER1 217 if (nm->is_compiled_by_c1()) { 218 c1_java_nmethod_stats.note_nmethod(nm); 219 } else 220 #endif 221 #ifdef COMPILER2 222 if (nm->is_compiled_by_c2()) { 223 c2_java_nmethod_stats.note_nmethod(nm); 224 } else 225 #endif 226 #if INCLUDE_JVMCI 227 if (nm->is_compiled_by_jvmci()) { 228 jvmci_java_nmethod_stats.note_nmethod(nm); 229 } else 230 #endif 231 { 232 unknown_java_nmethod_stats.note_nmethod(nm); 233 } 234 } 235 #endif // !PRODUCT 236 237 //--------------------------------------------------------------------------------- 238 239 240 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 241 assert(pc != NULL, "Must be non null"); 242 assert(exception.not_null(), "Must be non null"); 243 assert(handler != NULL, "Must be non null"); 244 245 _count = 0; 246 _exception_type = exception->klass(); 247 _next = NULL; 248 _purge_list_next = NULL; 249 250 add_address_and_handler(pc,handler); 251 } 252 253 254 address ExceptionCache::match(Handle exception, address pc) { 255 assert(pc != NULL,"Must be non null"); 256 assert(exception.not_null(),"Must be non null"); 257 if (exception->klass() == exception_type()) { 258 return (test_address(pc)); 259 } 260 261 return NULL; 262 } 263 264 265 bool ExceptionCache::match_exception_with_space(Handle exception) { 266 assert(exception.not_null(),"Must be non null"); 267 if (exception->klass() == exception_type() && count() < cache_size) { 268 return true; 269 } 270 return false; 271 } 272 273 274 address ExceptionCache::test_address(address addr) { 275 int limit = count(); 276 for (int i = 0; i < limit; i++) { 277 if (pc_at(i) == addr) { 278 return handler_at(i); 279 } 280 } 281 return NULL; 282 } 283 284 285 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 286 if (test_address(addr) == handler) return true; 287 288 int index = count(); 289 if (index < cache_size) { 290 set_pc_at(index, addr); 291 set_handler_at(index, handler); 292 increment_count(); 293 return true; 294 } 295 return false; 296 } 297 298 ExceptionCache* ExceptionCache::next() { 299 return Atomic::load(&_next); 300 } 301 302 void ExceptionCache::set_next(ExceptionCache *ec) { 303 Atomic::store(ec, &_next); 304 } 305 306 //----------------------------------------------------------------------------- 307 308 309 // Helper used by both find_pc_desc methods. 310 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 311 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_tests); 312 if (!approximate) 313 return pc->pc_offset() == pc_offset; 314 else 315 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 316 } 317 318 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 319 if (initial_pc_desc == NULL) { 320 _pc_descs[0] = NULL; // native method; no PcDescs at all 321 return; 322 } 323 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_resets); 324 // reset the cache by filling it with benign (non-null) values 325 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 326 for (int i = 0; i < cache_size; i++) 327 _pc_descs[i] = initial_pc_desc; 328 } 329 330 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 331 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_queries); 332 NOT_PRODUCT(if (approximate) ++pc_nmethod_stats.pc_desc_approx); 333 334 // Note: one might think that caching the most recently 335 // read value separately would be a win, but one would be 336 // wrong. When many threads are updating it, the cache 337 // line it's in would bounce between caches, negating 338 // any benefit. 339 340 // In order to prevent race conditions do not load cache elements 341 // repeatedly, but use a local copy: 342 PcDesc* res; 343 344 // Step one: Check the most recently added value. 345 res = _pc_descs[0]; 346 if (res == NULL) return NULL; // native method; no PcDescs at all 347 if (match_desc(res, pc_offset, approximate)) { 348 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_repeats); 349 return res; 350 } 351 352 // Step two: Check the rest of the LRU cache. 353 for (int i = 1; i < cache_size; ++i) { 354 res = _pc_descs[i]; 355 if (res->pc_offset() < 0) break; // optimization: skip empty cache 356 if (match_desc(res, pc_offset, approximate)) { 357 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_hits); 358 return res; 359 } 360 } 361 362 // Report failure. 363 return NULL; 364 } 365 366 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 367 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_adds); 368 // Update the LRU cache by shifting pc_desc forward. 369 for (int i = 0; i < cache_size; i++) { 370 PcDesc* next = _pc_descs[i]; 371 _pc_descs[i] = pc_desc; 372 pc_desc = next; 373 } 374 } 375 376 // adjust pcs_size so that it is a multiple of both oopSize and 377 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 378 // of oopSize, then 2*sizeof(PcDesc) is) 379 static int adjust_pcs_size(int pcs_size) { 380 int nsize = align_up(pcs_size, oopSize); 381 if ((nsize % sizeof(PcDesc)) != 0) { 382 nsize = pcs_size + sizeof(PcDesc); 383 } 384 assert((nsize % oopSize) == 0, "correct alignment"); 385 return nsize; 386 } 387 388 389 int nmethod::total_size() const { 390 return 391 consts_size() + 392 insts_size() + 393 stub_size() + 394 scopes_data_size() + 395 scopes_pcs_size() + 396 handler_table_size() + 397 nul_chk_table_size(); 398 } 399 400 address* nmethod::orig_pc_addr(const frame* fr) { 401 return (address*) ((address)fr->unextended_sp() + _orig_pc_offset); 402 } 403 404 const char* nmethod::compile_kind() const { 405 if (is_osr_method()) return "osr"; 406 if (method() != NULL && is_native_method()) return "c2n"; 407 return NULL; 408 } 409 410 // Fill in default values for various flag fields 411 void nmethod::init_defaults() { 412 _state = not_installed; 413 _has_flushed_dependencies = 0; 414 _lock_count = 0; 415 _stack_traversal_mark = 0; 416 _unload_reported = false; // jvmti state 417 _is_far_code = false; // nmethods are located in CodeCache 418 419 #ifdef ASSERT 420 _oops_are_stale = false; 421 #endif 422 423 _oops_do_mark_link = NULL; 424 _jmethod_id = NULL; 425 _osr_link = NULL; 426 _scavenge_root_link = NULL; 427 _scavenge_root_state = 0; 428 #if INCLUDE_RTM_OPT 429 _rtm_state = NoRTM; 430 #endif 431 #if INCLUDE_JVMCI 432 _jvmci_installed_code = NULL; 433 _speculation_log = NULL; 434 _jvmci_installed_code_triggers_invalidation = false; 435 #endif 436 } 437 438 nmethod* nmethod::new_native_nmethod(const methodHandle& method, 439 int compile_id, 440 CodeBuffer *code_buffer, 441 int vep_offset, 442 int frame_complete, 443 int frame_size, 444 ByteSize basic_lock_owner_sp_offset, 445 ByteSize basic_lock_sp_offset, 446 OopMapSet* oop_maps) { 447 code_buffer->finalize_oop_references(method); 448 // create nmethod 449 nmethod* nm = NULL; 450 { 451 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 452 int native_nmethod_size = CodeBlob::allocation_size(code_buffer, sizeof(nmethod)); 453 CodeOffsets offsets; 454 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 455 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 456 nm = new (native_nmethod_size, CompLevel_none) nmethod(method(), compiler_none, native_nmethod_size, 457 compile_id, &offsets, 458 code_buffer, frame_size, 459 basic_lock_owner_sp_offset, 460 basic_lock_sp_offset, oop_maps); 461 NOT_PRODUCT(if (nm != NULL) native_nmethod_stats.note_native_nmethod(nm)); 462 } 463 464 if (nm != NULL) { 465 // verify nmethod 466 debug_only(nm->verify();) // might block 467 468 nm->log_new_nmethod(); 469 nm->make_in_use(); 470 } 471 return nm; 472 } 473 474 nmethod* nmethod::new_nmethod(const methodHandle& method, 475 int compile_id, 476 int entry_bci, 477 CodeOffsets* offsets, 478 int orig_pc_offset, 479 DebugInformationRecorder* debug_info, 480 Dependencies* dependencies, 481 CodeBuffer* code_buffer, int frame_size, 482 OopMapSet* oop_maps, 483 ExceptionHandlerTable* handler_table, 484 ImplicitExceptionTable* nul_chk_table, 485 AbstractCompiler* compiler, 486 int comp_level 487 #if INCLUDE_JVMCI 488 , jweak installed_code, 489 jweak speculationLog 490 #endif 491 ) 492 { 493 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 494 code_buffer->finalize_oop_references(method); 495 // create nmethod 496 nmethod* nm = NULL; 497 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 498 int nmethod_size = 499 CodeBlob::allocation_size(code_buffer, sizeof(nmethod)) 500 + adjust_pcs_size(debug_info->pcs_size()) 501 + align_up((int)dependencies->size_in_bytes(), oopSize) 502 + align_up(handler_table->size_in_bytes() , oopSize) 503 + align_up(nul_chk_table->size_in_bytes() , oopSize) 504 + align_up(debug_info->data_size() , oopSize); 505 506 nm = new (nmethod_size, comp_level) 507 nmethod(method(), compiler->type(), nmethod_size, compile_id, entry_bci, offsets, 508 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 509 oop_maps, 510 handler_table, 511 nul_chk_table, 512 compiler, 513 comp_level 514 #if INCLUDE_JVMCI 515 , installed_code, 516 speculationLog 517 #endif 518 ); 519 520 if (nm != NULL) { 521 // To make dependency checking during class loading fast, record 522 // the nmethod dependencies in the classes it is dependent on. 523 // This allows the dependency checking code to simply walk the 524 // class hierarchy above the loaded class, checking only nmethods 525 // which are dependent on those classes. The slow way is to 526 // check every nmethod for dependencies which makes it linear in 527 // the number of methods compiled. For applications with a lot 528 // classes the slow way is too slow. 529 for (Dependencies::DepStream deps(nm); deps.next(); ) { 530 if (deps.type() == Dependencies::call_site_target_value) { 531 // CallSite dependencies are managed on per-CallSite instance basis. 532 oop call_site = deps.argument_oop(0); 533 MethodHandles::add_dependent_nmethod(call_site, nm); 534 } else { 535 Klass* klass = deps.context_type(); 536 if (klass == NULL) { 537 continue; // ignore things like evol_method 538 } 539 // record this nmethod as dependent on this klass 540 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 541 } 542 } 543 NOT_PRODUCT(if (nm != NULL) note_java_nmethod(nm)); 544 } 545 } 546 // Do verification and logging outside CodeCache_lock. 547 if (nm != NULL) { 548 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 549 DEBUG_ONLY(nm->verify();) 550 nm->log_new_nmethod(); 551 } 552 return nm; 553 } 554 555 // For native wrappers 556 nmethod::nmethod( 557 Method* method, 558 CompilerType type, 559 int nmethod_size, 560 int compile_id, 561 CodeOffsets* offsets, 562 CodeBuffer* code_buffer, 563 int frame_size, 564 ByteSize basic_lock_owner_sp_offset, 565 ByteSize basic_lock_sp_offset, 566 OopMapSet* oop_maps ) 567 : CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 568 _is_unloading_state(0), 569 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 570 _native_basic_lock_sp_offset(basic_lock_sp_offset) 571 { 572 { 573 int scopes_data_offset = 0; 574 int deoptimize_offset = 0; 575 int deoptimize_mh_offset = 0; 576 577 debug_only(NoSafepointVerifier nsv;) 578 assert_locked_or_safepoint(CodeCache_lock); 579 580 init_defaults(); 581 _entry_bci = InvocationEntryBci; 582 // We have no exception handler or deopt handler make the 583 // values something that will never match a pc like the nmethod vtable entry 584 _exception_offset = 0; 585 _orig_pc_offset = 0; 586 587 _consts_offset = data_offset(); 588 _stub_offset = data_offset(); 589 _oops_offset = data_offset(); 590 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 591 scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 592 _scopes_pcs_offset = scopes_data_offset; 593 _dependencies_offset = _scopes_pcs_offset; 594 _handler_table_offset = _dependencies_offset; 595 _nul_chk_table_offset = _handler_table_offset; 596 _nmethod_end_offset = _nul_chk_table_offset; 597 _compile_id = compile_id; 598 _comp_level = CompLevel_none; 599 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 600 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 601 _osr_entry_point = NULL; 602 _exception_cache = NULL; 603 _pc_desc_container.reset_to(NULL); 604 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 605 606 _scopes_data_begin = (address) this + scopes_data_offset; 607 _deopt_handler_begin = (address) this + deoptimize_offset; 608 _deopt_mh_handler_begin = (address) this + deoptimize_mh_offset; 609 610 code_buffer->copy_code_and_locs_to(this); 611 code_buffer->copy_values_to(this); 612 613 clear_unloading_state(); 614 if (ScavengeRootsInCode) { 615 Universe::heap()->register_nmethod(this); 616 } 617 debug_only(Universe::heap()->verify_nmethod(this)); 618 CodeCache::commit(this); 619 } 620 621 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 622 ttyLocker ttyl; // keep the following output all in one block 623 // This output goes directly to the tty, not the compiler log. 624 // To enable tools to match it up with the compilation activity, 625 // be sure to tag this tty output with the compile ID. 626 if (xtty != NULL) { 627 xtty->begin_head("print_native_nmethod"); 628 xtty->method(_method); 629 xtty->stamp(); 630 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 631 } 632 // print the header part first 633 print(); 634 // then print the requested information 635 if (PrintNativeNMethods) { 636 print_code(); 637 if (oop_maps != NULL) { 638 oop_maps->print(); 639 } 640 } 641 if (PrintRelocations) { 642 print_relocations(); 643 } 644 if (xtty != NULL) { 645 xtty->tail("print_native_nmethod"); 646 } 647 } 648 } 649 650 void* nmethod::operator new(size_t size, int nmethod_size, int comp_level) throw () { 651 return CodeCache::allocate(nmethod_size, CodeCache::get_code_blob_type(comp_level)); 652 } 653 654 nmethod::nmethod( 655 Method* method, 656 CompilerType type, 657 int nmethod_size, 658 int compile_id, 659 int entry_bci, 660 CodeOffsets* offsets, 661 int orig_pc_offset, 662 DebugInformationRecorder* debug_info, 663 Dependencies* dependencies, 664 CodeBuffer *code_buffer, 665 int frame_size, 666 OopMapSet* oop_maps, 667 ExceptionHandlerTable* handler_table, 668 ImplicitExceptionTable* nul_chk_table, 669 AbstractCompiler* compiler, 670 int comp_level 671 #if INCLUDE_JVMCI 672 , jweak installed_code, 673 jweak speculation_log 674 #endif 675 ) 676 : CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false), 677 _is_unloading_state(0), 678 _native_receiver_sp_offset(in_ByteSize(-1)), 679 _native_basic_lock_sp_offset(in_ByteSize(-1)) 680 { 681 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 682 { 683 debug_only(NoSafepointVerifier nsv;) 684 assert_locked_or_safepoint(CodeCache_lock); 685 686 _deopt_handler_begin = (address) this; 687 _deopt_mh_handler_begin = (address) this; 688 689 init_defaults(); 690 _entry_bci = entry_bci; 691 _compile_id = compile_id; 692 _comp_level = comp_level; 693 _orig_pc_offset = orig_pc_offset; 694 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 695 696 // Section offsets 697 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 698 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 699 set_ctable_begin(header_begin() + _consts_offset); 700 701 #if INCLUDE_JVMCI 702 _jvmci_installed_code = installed_code; 703 _speculation_log = speculation_log; 704 oop obj = JNIHandles::resolve(installed_code); 705 if (obj == NULL || (obj->is_a(HotSpotNmethod::klass()) && HotSpotNmethod::isDefault(obj))) { 706 _jvmci_installed_code_triggers_invalidation = false; 707 } else { 708 _jvmci_installed_code_triggers_invalidation = true; 709 } 710 711 if (compiler->is_jvmci()) { 712 // JVMCI might not produce any stub sections 713 if (offsets->value(CodeOffsets::Exceptions) != -1) { 714 _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); 715 } else { 716 _exception_offset = -1; 717 } 718 if (offsets->value(CodeOffsets::Deopt) != -1) { 719 _deopt_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::Deopt); 720 } else { 721 _deopt_handler_begin = NULL; 722 } 723 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 724 _deopt_mh_handler_begin = (address) this + code_offset() + offsets->value(CodeOffsets::DeoptMH); 725 } else { 726 _deopt_mh_handler_begin = NULL; 727 } 728 } else { 729 #endif 730 // Exception handler and deopt handler are in the stub section 731 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 732 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 733 734 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 735 _deopt_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::Deopt); 736 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 737 _deopt_mh_handler_begin = (address) this + _stub_offset + offsets->value(CodeOffsets::DeoptMH); 738 } else { 739 _deopt_mh_handler_begin = NULL; 740 #if INCLUDE_JVMCI 741 } 742 #endif 743 } 744 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 745 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 746 } else { 747 _unwind_handler_offset = -1; 748 } 749 750 _oops_offset = data_offset(); 751 _metadata_offset = _oops_offset + align_up(code_buffer->total_oop_size(), oopSize); 752 int scopes_data_offset = _metadata_offset + align_up(code_buffer->total_metadata_size(), wordSize); 753 754 _scopes_pcs_offset = scopes_data_offset + align_up(debug_info->data_size (), oopSize); 755 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 756 _handler_table_offset = _dependencies_offset + align_up((int)dependencies->size_in_bytes (), oopSize); 757 _nul_chk_table_offset = _handler_table_offset + align_up(handler_table->size_in_bytes(), oopSize); 758 _nmethod_end_offset = _nul_chk_table_offset + align_up(nul_chk_table->size_in_bytes(), oopSize); 759 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 760 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 761 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 762 _exception_cache = NULL; 763 764 _scopes_data_begin = (address) this + scopes_data_offset; 765 766 _pc_desc_container.reset_to(scopes_pcs_begin()); 767 768 code_buffer->copy_code_and_locs_to(this); 769 // Copy contents of ScopeDescRecorder to nmethod 770 code_buffer->copy_values_to(this); 771 debug_info->copy_to(this); 772 dependencies->copy_to(this); 773 clear_unloading_state(); 774 if (ScavengeRootsInCode) { 775 Universe::heap()->register_nmethod(this); 776 } 777 debug_only(Universe::heap()->verify_nmethod(this)); 778 779 CodeCache::commit(this); 780 781 // Copy contents of ExceptionHandlerTable to nmethod 782 handler_table->copy_to(this); 783 nul_chk_table->copy_to(this); 784 785 // we use the information of entry points to find out if a method is 786 // static or non static 787 assert(compiler->is_c2() || compiler->is_jvmci() || 788 _method->is_static() == (entry_point() == _verified_entry_point), 789 " entry points must be same for static methods and vice versa"); 790 } 791 } 792 793 // Print a short set of xml attributes to identify this nmethod. The 794 // output should be embedded in some other element. 795 void nmethod::log_identity(xmlStream* log) const { 796 log->print(" compile_id='%d'", compile_id()); 797 const char* nm_kind = compile_kind(); 798 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 799 log->print(" compiler='%s'", compiler_name()); 800 if (TieredCompilation) { 801 log->print(" level='%d'", comp_level()); 802 } 803 #if INCLUDE_JVMCI 804 char buffer[O_BUFLEN]; 805 char* jvmci_name = jvmci_installed_code_name(buffer, O_BUFLEN); 806 if (jvmci_name != NULL) { 807 log->print(" jvmci_installed_code_name='"); 808 log->text("%s", jvmci_name); 809 log->print("'"); 810 } 811 #endif 812 } 813 814 815 #define LOG_OFFSET(log, name) \ 816 if (p2i(name##_end()) - p2i(name##_begin())) \ 817 log->print(" " XSTR(name) "_offset='" INTX_FORMAT "'" , \ 818 p2i(name##_begin()) - p2i(this)) 819 820 821 void nmethod::log_new_nmethod() const { 822 if (LogCompilation && xtty != NULL) { 823 ttyLocker ttyl; 824 HandleMark hm; 825 xtty->begin_elem("nmethod"); 826 log_identity(xtty); 827 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", p2i(code_begin()), size()); 828 xtty->print(" address='" INTPTR_FORMAT "'", p2i(this)); 829 830 LOG_OFFSET(xtty, relocation); 831 LOG_OFFSET(xtty, consts); 832 LOG_OFFSET(xtty, insts); 833 LOG_OFFSET(xtty, stub); 834 LOG_OFFSET(xtty, scopes_data); 835 LOG_OFFSET(xtty, scopes_pcs); 836 LOG_OFFSET(xtty, dependencies); 837 LOG_OFFSET(xtty, handler_table); 838 LOG_OFFSET(xtty, nul_chk_table); 839 LOG_OFFSET(xtty, oops); 840 LOG_OFFSET(xtty, metadata); 841 842 xtty->method(method()); 843 xtty->stamp(); 844 xtty->end_elem(); 845 } 846 } 847 848 #undef LOG_OFFSET 849 850 851 // Print out more verbose output usually for a newly created nmethod. 852 void nmethod::print_on(outputStream* st, const char* msg) const { 853 if (st != NULL) { 854 ttyLocker ttyl; 855 if (WizardMode) { 856 CompileTask::print(st, this, msg, /*short_form:*/ true); 857 st->print_cr(" (" INTPTR_FORMAT ")", p2i(this)); 858 } else { 859 CompileTask::print(st, this, msg, /*short_form:*/ false); 860 } 861 } 862 } 863 864 void nmethod::maybe_print_nmethod(DirectiveSet* directive) { 865 bool printnmethods = directive->PrintAssemblyOption || directive->PrintNMethodsOption; 866 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 867 print_nmethod(printnmethods); 868 } 869 } 870 871 void nmethod::print_nmethod(bool printmethod) { 872 ttyLocker ttyl; // keep the following output all in one block 873 if (xtty != NULL) { 874 xtty->begin_head("print_nmethod"); 875 xtty->stamp(); 876 xtty->end_head(); 877 } 878 // print the header part first 879 print(); 880 // then print the requested information 881 if (printmethod) { 882 print_code(); 883 print_pcs(); 884 if (oop_maps()) { 885 oop_maps()->print(); 886 } 887 } 888 if (printmethod || PrintDebugInfo || CompilerOracle::has_option_string(_method, "PrintDebugInfo")) { 889 print_scopes(); 890 } 891 if (printmethod || PrintRelocations || CompilerOracle::has_option_string(_method, "PrintRelocations")) { 892 print_relocations(); 893 } 894 if (printmethod || PrintDependencies || CompilerOracle::has_option_string(_method, "PrintDependencies")) { 895 print_dependencies(); 896 } 897 if (printmethod || PrintExceptionHandlers) { 898 print_handler_table(); 899 print_nul_chk_table(); 900 } 901 if (printmethod) { 902 print_recorded_oops(); 903 print_recorded_metadata(); 904 } 905 if (xtty != NULL) { 906 xtty->tail("print_nmethod"); 907 } 908 } 909 910 911 // Promote one word from an assembly-time handle to a live embedded oop. 912 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 913 if (handle == NULL || 914 // As a special case, IC oops are initialized to 1 or -1. 915 handle == (jobject) Universe::non_oop_word()) { 916 (*dest) = (oop) handle; 917 } else { 918 (*dest) = JNIHandles::resolve_non_null(handle); 919 } 920 } 921 922 923 // Have to have the same name because it's called by a template 924 void nmethod::copy_values(GrowableArray<jobject>* array) { 925 int length = array->length(); 926 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 927 oop* dest = oops_begin(); 928 for (int index = 0 ; index < length; index++) { 929 initialize_immediate_oop(&dest[index], array->at(index)); 930 } 931 932 // Now we can fix up all the oops in the code. We need to do this 933 // in the code because the assembler uses jobjects as placeholders. 934 // The code and relocations have already been initialized by the 935 // CodeBlob constructor, so it is valid even at this early point to 936 // iterate over relocations and patch the code. 937 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 938 } 939 940 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 941 int length = array->length(); 942 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 943 Metadata** dest = metadata_begin(); 944 for (int index = 0 ; index < length; index++) { 945 dest[index] = array->at(index); 946 } 947 } 948 949 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 950 // re-patch all oop-bearing instructions, just in case some oops moved 951 RelocIterator iter(this, begin, end); 952 while (iter.next()) { 953 if (iter.type() == relocInfo::oop_type) { 954 oop_Relocation* reloc = iter.oop_reloc(); 955 if (initialize_immediates && reloc->oop_is_immediate()) { 956 oop* dest = reloc->oop_addr(); 957 initialize_immediate_oop(dest, (jobject) *dest); 958 } 959 // Refresh the oop-related bits of this instruction. 960 reloc->fix_oop_relocation(); 961 } else if (iter.type() == relocInfo::metadata_type) { 962 metadata_Relocation* reloc = iter.metadata_reloc(); 963 reloc->fix_metadata_relocation(); 964 } 965 } 966 } 967 968 969 void nmethod::verify_clean_inline_caches() { 970 assert(CompiledICLocker::is_safe(this), "mt unsafe call"); 971 972 ResourceMark rm; 973 RelocIterator iter(this, oops_reloc_begin()); 974 while(iter.next()) { 975 switch(iter.type()) { 976 case relocInfo::virtual_call_type: 977 case relocInfo::opt_virtual_call_type: { 978 CompiledIC *ic = CompiledIC_at(&iter); 979 // Ok, to lookup references to zombies here 980 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 981 assert(cb != NULL, "destination not in CodeBlob?"); 982 nmethod* nm = cb->as_nmethod_or_null(); 983 if( nm != NULL ) { 984 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 985 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 986 assert(ic->is_clean(), "IC should be clean"); 987 } 988 } 989 break; 990 } 991 case relocInfo::static_call_type: { 992 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 993 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 994 assert(cb != NULL, "destination not in CodeBlob?"); 995 nmethod* nm = cb->as_nmethod_or_null(); 996 if( nm != NULL ) { 997 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 998 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 999 assert(csc->is_clean(), "IC should be clean"); 1000 } 1001 } 1002 break; 1003 } 1004 default: 1005 break; 1006 } 1007 } 1008 } 1009 1010 // This is a private interface with the sweeper. 1011 void nmethod::mark_as_seen_on_stack() { 1012 assert(is_alive(), "Must be an alive method"); 1013 // Set the traversal mark to ensure that the sweeper does 2 1014 // cleaning passes before moving to zombie. 1015 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1016 } 1017 1018 // Tell if a non-entrant method can be converted to a zombie (i.e., 1019 // there are no activations on the stack, not in use by the VM, 1020 // and not in use by the ServiceThread) 1021 bool nmethod::can_convert_to_zombie() { 1022 // Note that this is called when the sweeper has observed the nmethod to be 1023 // not_entrant. However, with concurrent code cache unloading, the state 1024 // might have moved on to unloaded if it is_unloading(), due to racing 1025 // concurrent GC threads. 1026 assert(is_not_entrant() || is_unloading(), "must be a non-entrant method"); 1027 1028 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1029 // count can be greater than the stack traversal count before it hits the 1030 // nmethod for the second time. 1031 // If an is_unloading() nmethod is still not_entrant, then it is not safe to 1032 // convert it to zombie due to GC unloading interactions. However, if it 1033 // has become unloaded, then it is okay to convert such nmethods to zombie. 1034 return stack_traversal_mark() + 1 < NMethodSweeper::traversal_count() && 1035 !is_locked_by_vm() && (!is_unloading() || is_unloaded()); 1036 } 1037 1038 void nmethod::inc_decompile_count() { 1039 if (!is_compiled_by_c2() && !is_compiled_by_jvmci()) return; 1040 // Could be gated by ProfileTraps, but do not bother... 1041 Method* m = method(); 1042 if (m == NULL) return; 1043 MethodData* mdo = m->method_data(); 1044 if (mdo == NULL) return; 1045 // There is a benign race here. See comments in methodData.hpp. 1046 mdo->inc_decompile_count(); 1047 } 1048 1049 void nmethod::make_unloaded() { 1050 post_compiled_method_unload(); 1051 1052 // This nmethod is being unloaded, make sure that dependencies 1053 // recorded in instanceKlasses get flushed. 1054 // Since this work is being done during a GC, defer deleting dependencies from the 1055 // InstanceKlass. 1056 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1057 flush_dependencies(/*delete_immediately*/false); 1058 1059 // Break cycle between nmethod & method 1060 LogTarget(Trace, class, unload, nmethod) lt; 1061 if (lt.is_enabled()) { 1062 LogStream ls(lt); 1063 ls.print("making nmethod " INTPTR_FORMAT 1064 " unloadable, Method*(" INTPTR_FORMAT 1065 ") ", 1066 p2i(this), p2i(_method)); 1067 ls.cr(); 1068 } 1069 // Unlink the osr method, so we do not look this up again 1070 if (is_osr_method()) { 1071 // Invalidate the osr nmethod only once 1072 if (is_in_use()) { 1073 invalidate_osr_method(); 1074 } 1075 #ifdef ASSERT 1076 if (method() != NULL) { 1077 // Make sure osr nmethod is invalidated, i.e. not on the list 1078 bool found = method()->method_holder()->remove_osr_nmethod(this); 1079 assert(!found, "osr nmethod should have been invalidated"); 1080 } 1081 #endif 1082 } 1083 1084 // If _method is already NULL the Method* is about to be unloaded, 1085 // so we don't have to break the cycle. Note that it is possible to 1086 // have the Method* live here, in case we unload the nmethod because 1087 // it is pointing to some oop (other than the Method*) being unloaded. 1088 if (_method != NULL) { 1089 // OSR methods point to the Method*, but the Method* does not 1090 // point back! 1091 if (_method->code() == this) { 1092 _method->clear_code(); // Break a cycle 1093 } 1094 _method = NULL; // Clear the method of this dead nmethod 1095 } 1096 1097 // Make the class unloaded - i.e., change state and notify sweeper 1098 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1099 1100 // Unregister must be done before the state change 1101 Universe::heap()->unregister_nmethod(this); 1102 1103 // Log the unloading. 1104 log_state_change(); 1105 1106 #if INCLUDE_JVMCI 1107 // The method can only be unloaded after the pointer to the installed code 1108 // Java wrapper is no longer alive. Here we need to clear out this weak 1109 // reference to the dead object. 1110 maybe_invalidate_installed_code(); 1111 #endif 1112 1113 // The Method* is gone at this point 1114 assert(_method == NULL, "Tautology"); 1115 1116 set_osr_link(NULL); 1117 NMethodSweeper::report_state_change(this); 1118 1119 // The release is only needed for compile-time ordering, as accesses 1120 // into the nmethod after the store are not safe due to the sweeper 1121 // being allowed to free it when the store is observed, during 1122 // concurrent nmethod unloading. Therefore, there is no need for 1123 // acquire on the loader side. 1124 OrderAccess::release_store(&_state, (signed char)unloaded); 1125 } 1126 1127 void nmethod::invalidate_osr_method() { 1128 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1129 // Remove from list of active nmethods 1130 if (method() != NULL) { 1131 method()->method_holder()->remove_osr_nmethod(this); 1132 } 1133 } 1134 1135 void nmethod::log_state_change() const { 1136 if (LogCompilation) { 1137 if (xtty != NULL) { 1138 ttyLocker ttyl; // keep the following output all in one block 1139 if (_state == unloaded) { 1140 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1141 os::current_thread_id()); 1142 } else { 1143 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1144 os::current_thread_id(), 1145 (_state == zombie ? " zombie='1'" : "")); 1146 } 1147 log_identity(xtty); 1148 xtty->stamp(); 1149 xtty->end_elem(); 1150 } 1151 } 1152 1153 const char *state_msg = _state == zombie ? "made zombie" : "made not entrant"; 1154 CompileTask::print_ul(this, state_msg); 1155 if (PrintCompilation && _state != unloaded) { 1156 print_on(tty, state_msg); 1157 } 1158 } 1159 1160 /** 1161 * Common functionality for both make_not_entrant and make_zombie 1162 */ 1163 bool nmethod::make_not_entrant_or_zombie(int state) { 1164 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1165 assert(!is_zombie(), "should not already be a zombie"); 1166 1167 if (_state == state) { 1168 // Avoid taking the lock if already in required state. 1169 // This is safe from races because the state is an end-state, 1170 // which the nmethod cannot back out of once entered. 1171 // No need for fencing either. 1172 return false; 1173 } 1174 1175 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1176 nmethodLocker nml(this); 1177 methodHandle the_method(method()); 1178 // This can be called while the system is already at a safepoint which is ok 1179 NoSafepointVerifier nsv(true, !SafepointSynchronize::is_at_safepoint()); 1180 1181 // during patching, depending on the nmethod state we must notify the GC that 1182 // code has been unloaded, unregistering it. We cannot do this right while 1183 // holding the Patching_lock because we need to use the CodeCache_lock. This 1184 // would be prone to deadlocks. 1185 // This flag is used to remember whether we need to later lock and unregister. 1186 bool nmethod_needs_unregister = false; 1187 1188 { 1189 // invalidate osr nmethod before acquiring the patching lock since 1190 // they both acquire leaf locks and we don't want a deadlock. 1191 // This logic is equivalent to the logic below for patching the 1192 // verified entry point of regular methods. We check that the 1193 // nmethod is in use to ensure that it is invalidated only once. 1194 if (is_osr_method() && is_in_use()) { 1195 // this effectively makes the osr nmethod not entrant 1196 invalidate_osr_method(); 1197 } 1198 1199 // Enter critical section. Does not block for safepoint. 1200 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1201 1202 if (_state == state) { 1203 // another thread already performed this transition so nothing 1204 // to do, but return false to indicate this. 1205 return false; 1206 } 1207 1208 // The caller can be calling the method statically or through an inline 1209 // cache call. 1210 if (!is_osr_method() && !is_not_entrant()) { 1211 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1212 SharedRuntime::get_handle_wrong_method_stub()); 1213 } 1214 1215 if (is_in_use() && update_recompile_counts()) { 1216 // It's a true state change, so mark the method as decompiled. 1217 // Do it only for transition from alive. 1218 inc_decompile_count(); 1219 } 1220 1221 // If the state is becoming a zombie, signal to unregister the nmethod with 1222 // the heap. 1223 // This nmethod may have already been unloaded during a full GC. 1224 if ((state == zombie) && !is_unloaded()) { 1225 nmethod_needs_unregister = true; 1226 } 1227 1228 // Must happen before state change. Otherwise we have a race condition in 1229 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1230 // transition its state from 'not_entrant' to 'zombie' without having to wait 1231 // for stack scanning. 1232 if (state == not_entrant) { 1233 mark_as_seen_on_stack(); 1234 OrderAccess::storestore(); // _stack_traversal_mark and _state 1235 } 1236 1237 // Change state 1238 _state = state; 1239 1240 // Log the transition once 1241 log_state_change(); 1242 1243 // Invalidate while holding the patching lock 1244 JVMCI_ONLY(maybe_invalidate_installed_code()); 1245 1246 // Remove nmethod from method. 1247 // We need to check if both the _code and _from_compiled_code_entry_point 1248 // refer to this nmethod because there is a race in setting these two fields 1249 // in Method* as seen in bugid 4947125. 1250 // If the vep() points to the zombie nmethod, the memory for the nmethod 1251 // could be flushed and the compiler and vtable stubs could still call 1252 // through it. 1253 if (method() != NULL && (method()->code() == this || 1254 method()->from_compiled_entry() == verified_entry_point())) { 1255 HandleMark hm; 1256 method()->clear_code(false /* already owns Patching_lock */); 1257 } 1258 } // leave critical region under Patching_lock 1259 1260 #ifdef ASSERT 1261 if (is_osr_method() && method() != NULL) { 1262 // Make sure osr nmethod is invalidated, i.e. not on the list 1263 bool found = method()->method_holder()->remove_osr_nmethod(this); 1264 assert(!found, "osr nmethod should have been invalidated"); 1265 } 1266 #endif 1267 1268 // When the nmethod becomes zombie it is no longer alive so the 1269 // dependencies must be flushed. nmethods in the not_entrant 1270 // state will be flushed later when the transition to zombie 1271 // happens or they get unloaded. 1272 if (state == zombie) { 1273 { 1274 // Flushing dependencies must be done before any possible 1275 // safepoint can sneak in, otherwise the oops used by the 1276 // dependency logic could have become stale. 1277 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1278 if (nmethod_needs_unregister) { 1279 Universe::heap()->unregister_nmethod(this); 1280 } 1281 flush_dependencies(/*delete_immediately*/true); 1282 } 1283 1284 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1285 // event and it hasn't already been reported for this nmethod then 1286 // report it now. The event may have been reported earlier if the GC 1287 // marked it for unloading). JvmtiDeferredEventQueue support means 1288 // we no longer go to a safepoint here. 1289 post_compiled_method_unload(); 1290 1291 #ifdef ASSERT 1292 // It's no longer safe to access the oops section since zombie 1293 // nmethods aren't scanned for GC. 1294 _oops_are_stale = true; 1295 #endif 1296 // the Method may be reclaimed by class unloading now that the 1297 // nmethod is in zombie state 1298 set_method(NULL); 1299 } else { 1300 assert(state == not_entrant, "other cases may need to be handled differently"); 1301 } 1302 1303 if (TraceCreateZombies) { 1304 ResourceMark m; 1305 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"); 1306 } 1307 1308 NMethodSweeper::report_state_change(this); 1309 return true; 1310 } 1311 1312 void nmethod::flush() { 1313 // Note that there are no valid oops in the nmethod anymore. 1314 assert(!is_osr_method() || is_unloaded() || is_zombie(), 1315 "osr nmethod must be unloaded or zombie before flushing"); 1316 assert(is_zombie() || is_osr_method(), "must be a zombie method"); 1317 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1318 assert_locked_or_safepoint(CodeCache_lock); 1319 1320 // completely deallocate this method 1321 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, p2i(this)); 1322 if (PrintMethodFlushing) { 1323 tty->print_cr("*flushing %s nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT 1324 "/Free CodeCache:" SIZE_FORMAT "Kb", 1325 is_osr_method() ? "osr" : "",_compile_id, p2i(this), CodeCache::blob_count(), 1326 CodeCache::unallocated_capacity(CodeCache::get_code_blob_type(this))/1024); 1327 } 1328 1329 // We need to deallocate any ExceptionCache data. 1330 // Note that we do not need to grab the nmethod lock for this, it 1331 // better be thread safe if we're disposing of it! 1332 ExceptionCache* ec = exception_cache(); 1333 set_exception_cache(NULL); 1334 while(ec != NULL) { 1335 ExceptionCache* next = ec->next(); 1336 delete ec; 1337 ec = next; 1338 } 1339 1340 if (on_scavenge_root_list()) { 1341 CodeCache::drop_scavenge_root_nmethod(this); 1342 } 1343 1344 #if INCLUDE_JVMCI 1345 assert(_jvmci_installed_code == NULL, "should have been nulled out when transitioned to zombie"); 1346 assert(_speculation_log == NULL, "should have been nulled out when transitioned to zombie"); 1347 #endif 1348 1349 CodeBlob::flush(); 1350 CodeCache::free(this); 1351 } 1352 1353 oop nmethod::oop_at(int index) const { 1354 if (index == 0) { 1355 return NULL; 1356 } 1357 return NativeAccess<AS_NO_KEEPALIVE>::oop_load(oop_addr_at(index)); 1358 } 1359 1360 // 1361 // Notify all classes this nmethod is dependent on that it is no 1362 // longer dependent. This should only be called in two situations. 1363 // First, when a nmethod transitions to a zombie all dependents need 1364 // to be clear. Since zombification happens at a safepoint there's no 1365 // synchronization issues. The second place is a little more tricky. 1366 // During phase 1 of mark sweep class unloading may happen and as a 1367 // result some nmethods may get unloaded. In this case the flushing 1368 // of dependencies must happen during phase 1 since after GC any 1369 // dependencies in the unloaded nmethod won't be updated, so 1370 // traversing the dependency information in unsafe. In that case this 1371 // function is called with a boolean argument and this function only 1372 // notifies instanceKlasses that are reachable 1373 1374 void nmethod::flush_dependencies(bool delete_immediately) { 1375 DEBUG_ONLY(bool called_by_gc = Universe::heap()->is_gc_active() || Thread::current()->is_ConcurrentGC_thread();) 1376 assert(called_by_gc != delete_immediately, 1377 "delete_immediately is false if and only if we are called during GC"); 1378 if (!has_flushed_dependencies()) { 1379 set_has_flushed_dependencies(); 1380 for (Dependencies::DepStream deps(this); deps.next(); ) { 1381 if (deps.type() == Dependencies::call_site_target_value) { 1382 // CallSite dependencies are managed on per-CallSite instance basis. 1383 oop call_site = deps.argument_oop(0); 1384 if (delete_immediately) { 1385 assert_locked_or_safepoint(CodeCache_lock); 1386 MethodHandles::remove_dependent_nmethod(call_site, this); 1387 } else { 1388 MethodHandles::clean_dependency_context(call_site); 1389 } 1390 } else { 1391 Klass* klass = deps.context_type(); 1392 if (klass == NULL) { 1393 continue; // ignore things like evol_method 1394 } 1395 // During GC delete_immediately is false, and liveness 1396 // of dependee determines class that needs to be updated. 1397 if (delete_immediately) { 1398 assert_locked_or_safepoint(CodeCache_lock); 1399 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1400 } else if (klass->is_loader_alive()) { 1401 // The GC may clean dependency contexts concurrently and in parallel. 1402 InstanceKlass::cast(klass)->clean_dependency_context(); 1403 } 1404 } 1405 } 1406 } 1407 } 1408 1409 // ------------------------------------------------------------------ 1410 // post_compiled_method_load_event 1411 // new method for install_code() path 1412 // Transfer information from compilation to jvmti 1413 void nmethod::post_compiled_method_load_event() { 1414 1415 Method* moop = method(); 1416 HOTSPOT_COMPILED_METHOD_LOAD( 1417 (char *) moop->klass_name()->bytes(), 1418 moop->klass_name()->utf8_length(), 1419 (char *) moop->name()->bytes(), 1420 moop->name()->utf8_length(), 1421 (char *) moop->signature()->bytes(), 1422 moop->signature()->utf8_length(), 1423 insts_begin(), insts_size()); 1424 1425 if (JvmtiExport::should_post_compiled_method_load() || 1426 JvmtiExport::should_post_compiled_method_unload()) { 1427 get_and_cache_jmethod_id(); 1428 } 1429 1430 if (JvmtiExport::should_post_compiled_method_load()) { 1431 // Let the Service thread (which is a real Java thread) post the event 1432 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1433 JvmtiDeferredEventQueue::enqueue( 1434 JvmtiDeferredEvent::compiled_method_load_event(this)); 1435 } 1436 } 1437 1438 jmethodID nmethod::get_and_cache_jmethod_id() { 1439 if (_jmethod_id == NULL) { 1440 // Cache the jmethod_id since it can no longer be looked up once the 1441 // method itself has been marked for unloading. 1442 _jmethod_id = method()->jmethod_id(); 1443 } 1444 return _jmethod_id; 1445 } 1446 1447 void nmethod::post_compiled_method_unload() { 1448 if (unload_reported()) { 1449 // During unloading we transition to unloaded and then to zombie 1450 // and the unloading is reported during the first transition. 1451 return; 1452 } 1453 1454 assert(_method != NULL && !is_unloaded(), "just checking"); 1455 DTRACE_METHOD_UNLOAD_PROBE(method()); 1456 1457 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1458 // post the event. Sometime later this nmethod will be made a zombie 1459 // by the sweeper but the Method* will not be valid at that point. 1460 // If the _jmethod_id is null then no load event was ever requested 1461 // so don't bother posting the unload. The main reason for this is 1462 // that the jmethodID is a weak reference to the Method* so if 1463 // it's being unloaded there's no way to look it up since the weak 1464 // ref will have been cleared. 1465 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1466 assert(!unload_reported(), "already unloaded"); 1467 JvmtiDeferredEvent event = 1468 JvmtiDeferredEvent::compiled_method_unload_event(this, 1469 _jmethod_id, insts_begin()); 1470 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1471 JvmtiDeferredEventQueue::enqueue(event); 1472 } 1473 1474 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1475 // any time. As the nmethod is being unloaded now we mark it has 1476 // having the unload event reported - this will ensure that we don't 1477 // attempt to report the event in the unlikely scenario where the 1478 // event is enabled at the time the nmethod is made a zombie. 1479 set_unload_reported(); 1480 } 1481 1482 // Iterate over metadata calling this function. Used by RedefineClasses 1483 void nmethod::metadata_do(void f(Metadata*)) { 1484 { 1485 // Visit all immediate references that are embedded in the instruction stream. 1486 RelocIterator iter(this, oops_reloc_begin()); 1487 while (iter.next()) { 1488 if (iter.type() == relocInfo::metadata_type ) { 1489 metadata_Relocation* r = iter.metadata_reloc(); 1490 // In this metadata, we must only follow those metadatas directly embedded in 1491 // the code. Other metadatas (oop_index>0) are seen as part of 1492 // the metadata section below. 1493 assert(1 == (r->metadata_is_immediate()) + 1494 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 1495 "metadata must be found in exactly one place"); 1496 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 1497 Metadata* md = r->metadata_value(); 1498 if (md != _method) f(md); 1499 } 1500 } else if (iter.type() == relocInfo::virtual_call_type) { 1501 // Check compiledIC holders associated with this nmethod 1502 ResourceMark rm; 1503 CompiledIC *ic = CompiledIC_at(&iter); 1504 if (ic->is_icholder_call()) { 1505 CompiledICHolder* cichk = ic->cached_icholder(); 1506 f(cichk->holder_metadata()); 1507 f(cichk->holder_klass()); 1508 } else { 1509 Metadata* ic_oop = ic->cached_metadata(); 1510 if (ic_oop != NULL) { 1511 f(ic_oop); 1512 } 1513 } 1514 } 1515 } 1516 } 1517 1518 // Visit the metadata section 1519 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 1520 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 1521 Metadata* md = *p; 1522 f(md); 1523 } 1524 1525 // Visit metadata not embedded in the other places. 1526 if (_method != NULL) f(_method); 1527 } 1528 1529 // The _is_unloading_state encodes a tuple comprising the unloading cycle 1530 // and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle. 1531 // This is the bit layout of the _is_unloading_state byte: 00000CCU 1532 // CC refers to the cycle, which has 2 bits, and U refers to the result of 1533 // IsUnloadingBehaviour::is_unloading() for that unloading cycle. 1534 1535 class IsUnloadingState: public AllStatic { 1536 static const uint8_t _is_unloading_mask = 1; 1537 static const uint8_t _is_unloading_shift = 0; 1538 static const uint8_t _unloading_cycle_mask = 6; 1539 static const uint8_t _unloading_cycle_shift = 1; 1540 1541 static uint8_t set_is_unloading(uint8_t state, bool value) { 1542 state &= ~_is_unloading_mask; 1543 if (value) { 1544 state |= 1 << _is_unloading_shift; 1545 } 1546 assert(is_unloading(state) == value, "unexpected unloading cycle overflow"); 1547 return state; 1548 } 1549 1550 static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) { 1551 state &= ~_unloading_cycle_mask; 1552 state |= value << _unloading_cycle_shift; 1553 assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow"); 1554 return state; 1555 } 1556 1557 public: 1558 static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; } 1559 static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; } 1560 1561 static uint8_t create(bool is_unloading, uint8_t unloading_cycle) { 1562 uint8_t state = 0; 1563 state = set_is_unloading(state, is_unloading); 1564 state = set_unloading_cycle(state, unloading_cycle); 1565 return state; 1566 } 1567 }; 1568 1569 bool nmethod::is_unloading() { 1570 uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state); 1571 bool state_is_unloading = IsUnloadingState::is_unloading(state); 1572 uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state); 1573 if (state_is_unloading) { 1574 return true; 1575 } 1576 uint8_t current_cycle = CodeCache::unloading_cycle(); 1577 if (state_unloading_cycle == current_cycle) { 1578 return false; 1579 } 1580 1581 // The IsUnloadingBehaviour is responsible for checking if there are any dead 1582 // oops in the CompiledMethod, by calling oops_do on it. 1583 state_unloading_cycle = current_cycle; 1584 1585 if (is_zombie()) { 1586 // Zombies without calculated unloading epoch are never unloading due to GC. 1587 state_is_unloading = false; 1588 } else { 1589 state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this); 1590 } 1591 1592 state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle); 1593 1594 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1595 1596 return state_is_unloading; 1597 } 1598 1599 void nmethod::clear_unloading_state() { 1600 uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle()); 1601 RawAccess<MO_RELAXED>::store(&_is_unloading_state, state); 1602 } 1603 1604 1605 // This is called at the end of the strong tracing/marking phase of a 1606 // GC to unload an nmethod if it contains otherwise unreachable 1607 // oops. 1608 1609 void nmethod::do_unloading(bool unloading_occurred) { 1610 // Make sure the oop's ready to receive visitors 1611 assert(!is_zombie() && !is_unloaded(), 1612 "should not call follow on zombie or unloaded nmethod"); 1613 1614 if (is_unloading()) { 1615 make_unloaded(); 1616 } else { 1617 #if INCLUDE_JVMCI 1618 if (_jvmci_installed_code != NULL) { 1619 if (JNIHandles::is_global_weak_cleared(_jvmci_installed_code)) { 1620 if (_jvmci_installed_code_triggers_invalidation) { 1621 make_not_entrant(); 1622 } 1623 clear_jvmci_installed_code(); 1624 } 1625 } 1626 #endif 1627 1628 unload_nmethod_caches(unloading_occurred); 1629 } 1630 } 1631 1632 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 1633 // make sure the oops ready to receive visitors 1634 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 1635 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 1636 1637 // Prevent extra code cache walk for platforms that don't have immediate oops. 1638 if (relocInfo::mustIterateImmediateOopsInCode()) { 1639 RelocIterator iter(this, oops_reloc_begin()); 1640 1641 while (iter.next()) { 1642 if (iter.type() == relocInfo::oop_type ) { 1643 oop_Relocation* r = iter.oop_reloc(); 1644 // In this loop, we must only follow those oops directly embedded in 1645 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1646 assert(1 == (r->oop_is_immediate()) + 1647 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1648 "oop must be found in exactly one place"); 1649 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1650 f->do_oop(r->oop_addr()); 1651 } 1652 } 1653 } 1654 } 1655 1656 // Scopes 1657 // This includes oop constants not inlined in the code stream. 1658 for (oop* p = oops_begin(); p < oops_end(); p++) { 1659 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1660 f->do_oop(p); 1661 } 1662 } 1663 1664 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 1665 1666 nmethod* volatile nmethod::_oops_do_mark_nmethods; 1667 1668 // An nmethod is "marked" if its _mark_link is set non-null. 1669 // Even if it is the end of the linked list, it will have a non-null link value, 1670 // as long as it is on the list. 1671 // This code must be MP safe, because it is used from parallel GC passes. 1672 bool nmethod::test_set_oops_do_mark() { 1673 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 1674 if (_oops_do_mark_link == NULL) { 1675 // Claim this nmethod for this thread to mark. 1676 if (Atomic::replace_if_null(NMETHOD_SENTINEL, &_oops_do_mark_link)) { 1677 // Atomically append this nmethod (now claimed) to the head of the list: 1678 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 1679 for (;;) { 1680 nmethod* required_mark_nmethods = observed_mark_nmethods; 1681 _oops_do_mark_link = required_mark_nmethods; 1682 observed_mark_nmethods = 1683 Atomic::cmpxchg(this, &_oops_do_mark_nmethods, required_mark_nmethods); 1684 if (observed_mark_nmethods == required_mark_nmethods) 1685 break; 1686 } 1687 // Mark was clear when we first saw this guy. 1688 LogTarget(Trace, gc, nmethod) lt; 1689 if (lt.is_enabled()) { 1690 LogStream ls(lt); 1691 CompileTask::print(&ls, this, "oops_do, mark", /*short_form:*/ true); 1692 } 1693 return false; 1694 } 1695 } 1696 // On fall through, another racing thread marked this nmethod before we did. 1697 return true; 1698 } 1699 1700 void nmethod::oops_do_marking_prologue() { 1701 log_trace(gc, nmethod)("oops_do_marking_prologue"); 1702 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 1703 // We use cmpxchg instead of regular assignment here because the user 1704 // may fork a bunch of threads, and we need them all to see the same state. 1705 nmethod* observed = Atomic::cmpxchg(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, (nmethod*)NULL); 1706 guarantee(observed == NULL, "no races in this sequential code"); 1707 } 1708 1709 void nmethod::oops_do_marking_epilogue() { 1710 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 1711 nmethod* cur = _oops_do_mark_nmethods; 1712 while (cur != NMETHOD_SENTINEL) { 1713 assert(cur != NULL, "not NULL-terminated"); 1714 nmethod* next = cur->_oops_do_mark_link; 1715 cur->_oops_do_mark_link = NULL; 1716 DEBUG_ONLY(cur->verify_oop_relocations()); 1717 1718 LogTarget(Trace, gc, nmethod) lt; 1719 if (lt.is_enabled()) { 1720 LogStream ls(lt); 1721 CompileTask::print(&ls, cur, "oops_do, unmark", /*short_form:*/ true); 1722 } 1723 cur = next; 1724 } 1725 nmethod* required = _oops_do_mark_nmethods; 1726 nmethod* observed = Atomic::cmpxchg((nmethod*)NULL, &_oops_do_mark_nmethods, required); 1727 guarantee(observed == required, "no races in this sequential code"); 1728 log_trace(gc, nmethod)("oops_do_marking_epilogue"); 1729 } 1730 1731 class DetectScavengeRoot: public OopClosure { 1732 bool _detected_scavenge_root; 1733 nmethod* _print_nm; 1734 public: 1735 DetectScavengeRoot(nmethod* nm) : _detected_scavenge_root(false), _print_nm(nm) {} 1736 1737 bool detected_scavenge_root() { return _detected_scavenge_root; } 1738 virtual void do_oop(oop* p) { 1739 if ((*p) != NULL && Universe::heap()->is_scavengable(*p)) { 1740 NOT_PRODUCT(maybe_print(p)); 1741 _detected_scavenge_root = true; 1742 } 1743 } 1744 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 1745 1746 #ifndef PRODUCT 1747 void maybe_print(oop* p) { 1748 LogTarget(Trace, gc, nmethod) lt; 1749 if (lt.is_enabled()) { 1750 LogStream ls(lt); 1751 if (!_detected_scavenge_root) { 1752 CompileTask::print(&ls, _print_nm, "new scavenge root", /*short_form:*/ true); 1753 } 1754 ls.print("" PTR_FORMAT "[offset=%d] detected scavengable oop " PTR_FORMAT " (found at " PTR_FORMAT ") ", 1755 p2i(_print_nm), (int)((intptr_t)p - (intptr_t)_print_nm), 1756 p2i(*p), p2i(p)); 1757 ls.cr(); 1758 } 1759 } 1760 #endif //PRODUCT 1761 }; 1762 1763 bool nmethod::detect_scavenge_root_oops() { 1764 DetectScavengeRoot detect_scavenge_root(this); 1765 oops_do(&detect_scavenge_root); 1766 return detect_scavenge_root.detected_scavenge_root(); 1767 } 1768 1769 inline bool includes(void* p, void* from, void* to) { 1770 return from <= p && p < to; 1771 } 1772 1773 1774 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 1775 assert(count >= 2, "must be sentinel values, at least"); 1776 1777 #ifdef ASSERT 1778 // must be sorted and unique; we do a binary search in find_pc_desc() 1779 int prev_offset = pcs[0].pc_offset(); 1780 assert(prev_offset == PcDesc::lower_offset_limit, 1781 "must start with a sentinel"); 1782 for (int i = 1; i < count; i++) { 1783 int this_offset = pcs[i].pc_offset(); 1784 assert(this_offset > prev_offset, "offsets must be sorted"); 1785 prev_offset = this_offset; 1786 } 1787 assert(prev_offset == PcDesc::upper_offset_limit, 1788 "must end with a sentinel"); 1789 #endif //ASSERT 1790 1791 // Search for MethodHandle invokes and tag the nmethod. 1792 for (int i = 0; i < count; i++) { 1793 if (pcs[i].is_method_handle_invoke()) { 1794 set_has_method_handle_invokes(true); 1795 break; 1796 } 1797 } 1798 assert(has_method_handle_invokes() == (_deopt_mh_handler_begin != NULL), "must have deopt mh handler"); 1799 1800 int size = count * sizeof(PcDesc); 1801 assert(scopes_pcs_size() >= size, "oob"); 1802 memcpy(scopes_pcs_begin(), pcs, size); 1803 1804 // Adjust the final sentinel downward. 1805 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 1806 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 1807 last_pc->set_pc_offset(content_size() + 1); 1808 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 1809 // Fill any rounding gaps with copies of the last record. 1810 last_pc[1] = last_pc[0]; 1811 } 1812 // The following assert could fail if sizeof(PcDesc) is not 1813 // an integral multiple of oopSize (the rounding term). 1814 // If it fails, change the logic to always allocate a multiple 1815 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 1816 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 1817 } 1818 1819 void nmethod::copy_scopes_data(u_char* buffer, int size) { 1820 assert(scopes_data_size() >= size, "oob"); 1821 memcpy(scopes_data_begin(), buffer, size); 1822 } 1823 1824 #ifdef ASSERT 1825 static PcDesc* linear_search(const PcDescSearch& search, int pc_offset, bool approximate) { 1826 PcDesc* lower = search.scopes_pcs_begin(); 1827 PcDesc* upper = search.scopes_pcs_end(); 1828 lower += 1; // exclude initial sentinel 1829 PcDesc* res = NULL; 1830 for (PcDesc* p = lower; p < upper; p++) { 1831 NOT_PRODUCT(--pc_nmethod_stats.pc_desc_tests); // don't count this call to match_desc 1832 if (match_desc(p, pc_offset, approximate)) { 1833 if (res == NULL) 1834 res = p; 1835 else 1836 res = (PcDesc*) badAddress; 1837 } 1838 } 1839 return res; 1840 } 1841 #endif 1842 1843 1844 // Finds a PcDesc with real-pc equal to "pc" 1845 PcDesc* PcDescContainer::find_pc_desc_internal(address pc, bool approximate, const PcDescSearch& search) { 1846 address base_address = search.code_begin(); 1847 if ((pc < base_address) || 1848 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 1849 return NULL; // PC is wildly out of range 1850 } 1851 int pc_offset = (int) (pc - base_address); 1852 1853 // Check the PcDesc cache if it contains the desired PcDesc 1854 // (This as an almost 100% hit rate.) 1855 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 1856 if (res != NULL) { 1857 assert(res == linear_search(search, pc_offset, approximate), "cache ok"); 1858 return res; 1859 } 1860 1861 // Fallback algorithm: quasi-linear search for the PcDesc 1862 // Find the last pc_offset less than the given offset. 1863 // The successor must be the required match, if there is a match at all. 1864 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 1865 PcDesc* lower = search.scopes_pcs_begin(); 1866 PcDesc* upper = search.scopes_pcs_end(); 1867 upper -= 1; // exclude final sentinel 1868 if (lower >= upper) return NULL; // native method; no PcDescs at all 1869 1870 #define assert_LU_OK \ 1871 /* invariant on lower..upper during the following search: */ \ 1872 assert(lower->pc_offset() < pc_offset, "sanity"); \ 1873 assert(upper->pc_offset() >= pc_offset, "sanity") 1874 assert_LU_OK; 1875 1876 // Use the last successful return as a split point. 1877 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 1878 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1879 if (mid->pc_offset() < pc_offset) { 1880 lower = mid; 1881 } else { 1882 upper = mid; 1883 } 1884 1885 // Take giant steps at first (4096, then 256, then 16, then 1) 1886 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 1887 const int RADIX = (1 << LOG2_RADIX); 1888 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 1889 while ((mid = lower + step) < upper) { 1890 assert_LU_OK; 1891 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1892 if (mid->pc_offset() < pc_offset) { 1893 lower = mid; 1894 } else { 1895 upper = mid; 1896 break; 1897 } 1898 } 1899 assert_LU_OK; 1900 } 1901 1902 // Sneak up on the value with a linear search of length ~16. 1903 while (true) { 1904 assert_LU_OK; 1905 mid = lower + 1; 1906 NOT_PRODUCT(++pc_nmethod_stats.pc_desc_searches); 1907 if (mid->pc_offset() < pc_offset) { 1908 lower = mid; 1909 } else { 1910 upper = mid; 1911 break; 1912 } 1913 } 1914 #undef assert_LU_OK 1915 1916 if (match_desc(upper, pc_offset, approximate)) { 1917 assert(upper == linear_search(search, pc_offset, approximate), "search ok"); 1918 _pc_desc_cache.add_pc_desc(upper); 1919 return upper; 1920 } else { 1921 assert(NULL == linear_search(search, pc_offset, approximate), "search ok"); 1922 return NULL; 1923 } 1924 } 1925 1926 1927 void nmethod::check_all_dependencies(DepChange& changes) { 1928 // Checked dependencies are allocated into this ResourceMark 1929 ResourceMark rm; 1930 1931 // Turn off dependency tracing while actually testing dependencies. 1932 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 1933 1934 typedef ResourceHashtable<DependencySignature, int, &DependencySignature::hash, 1935 &DependencySignature::equals, 11027> DepTable; 1936 1937 DepTable* table = new DepTable(); 1938 1939 // Iterate over live nmethods and check dependencies of all nmethods that are not 1940 // marked for deoptimization. A particular dependency is only checked once. 1941 NMethodIterator iter(NMethodIterator::only_alive_and_not_unloading); 1942 while(iter.next()) { 1943 nmethod* nm = iter.method(); 1944 // Only notify for live nmethods 1945 if (!nm->is_marked_for_deoptimization()) { 1946 for (Dependencies::DepStream deps(nm); deps.next(); ) { 1947 // Construct abstraction of a dependency. 1948 DependencySignature* current_sig = new DependencySignature(deps); 1949 1950 // Determine if dependency is already checked. table->put(...) returns 1951 // 'true' if the dependency is added (i.e., was not in the hashtable). 1952 if (table->put(*current_sig, 1)) { 1953 if (deps.check_dependency() != NULL) { 1954 // Dependency checking failed. Print out information about the failed 1955 // dependency and finally fail with an assert. We can fail here, since 1956 // dependency checking is never done in a product build. 1957 tty->print_cr("Failed dependency:"); 1958 changes.print(); 1959 nm->print(); 1960 nm->print_dependencies(); 1961 assert(false, "Should have been marked for deoptimization"); 1962 } 1963 } 1964 } 1965 } 1966 } 1967 } 1968 1969 bool nmethod::check_dependency_on(DepChange& changes) { 1970 // What has happened: 1971 // 1) a new class dependee has been added 1972 // 2) dependee and all its super classes have been marked 1973 bool found_check = false; // set true if we are upset 1974 for (Dependencies::DepStream deps(this); deps.next(); ) { 1975 // Evaluate only relevant dependencies. 1976 if (deps.spot_check_dependency_at(changes) != NULL) { 1977 found_check = true; 1978 NOT_DEBUG(break); 1979 } 1980 } 1981 return found_check; 1982 } 1983 1984 bool nmethod::is_evol_dependent_on(Klass* dependee) { 1985 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 1986 Array<Method*>* dependee_methods = dependee_ik->methods(); 1987 for (Dependencies::DepStream deps(this); deps.next(); ) { 1988 if (deps.type() == Dependencies::evol_method) { 1989 Method* method = deps.method_argument(0); 1990 for (int j = 0; j < dependee_methods->length(); j++) { 1991 if (dependee_methods->at(j) == method) { 1992 if (log_is_enabled(Debug, redefine, class, nmethod)) { 1993 ResourceMark rm; 1994 log_debug(redefine, class, nmethod) 1995 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 1996 _method->method_holder()->external_name(), 1997 _method->name()->as_C_string(), 1998 _method->signature()->as_C_string(), 1999 compile_id(), 2000 method->method_holder()->external_name(), 2001 method->name()->as_C_string(), 2002 method->signature()->as_C_string()); 2003 } 2004 if (TraceDependencies || LogCompilation) 2005 deps.log_dependency(dependee); 2006 return true; 2007 } 2008 } 2009 } 2010 } 2011 return false; 2012 } 2013 2014 // Called from mark_for_deoptimization, when dependee is invalidated. 2015 bool nmethod::is_dependent_on_method(Method* dependee) { 2016 for (Dependencies::DepStream deps(this); deps.next(); ) { 2017 if (deps.type() != Dependencies::evol_method) 2018 continue; 2019 Method* method = deps.method_argument(0); 2020 if (method == dependee) return true; 2021 } 2022 return false; 2023 } 2024 2025 2026 bool nmethod::is_patchable_at(address instr_addr) { 2027 assert(insts_contains(instr_addr), "wrong nmethod used"); 2028 if (is_zombie()) { 2029 // a zombie may never be patched 2030 return false; 2031 } 2032 return true; 2033 } 2034 2035 2036 address nmethod::continuation_for_implicit_exception(address pc) { 2037 // Exception happened outside inline-cache check code => we are inside 2038 // an active nmethod => use cpc to determine a return address 2039 int exception_offset = pc - code_begin(); 2040 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2041 #ifdef ASSERT 2042 if (cont_offset == 0) { 2043 Thread* thread = Thread::current(); 2044 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2045 HandleMark hm(thread); 2046 ResourceMark rm(thread); 2047 CodeBlob* cb = CodeCache::find_blob(pc); 2048 assert(cb != NULL && cb == this, ""); 2049 ttyLocker ttyl; 2050 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, p2i(pc)); 2051 print(); 2052 method()->print_codes(); 2053 print_code(); 2054 print_pcs(); 2055 } 2056 #endif 2057 if (cont_offset == 0) { 2058 // Let the normal error handling report the exception 2059 return NULL; 2060 } 2061 return code_begin() + cont_offset; 2062 } 2063 2064 2065 2066 void nmethod_init() { 2067 // make sure you didn't forget to adjust the filler fields 2068 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2069 } 2070 2071 2072 //------------------------------------------------------------------------------------------- 2073 2074 2075 // QQQ might we make this work from a frame?? 2076 nmethodLocker::nmethodLocker(address pc) { 2077 CodeBlob* cb = CodeCache::find_blob(pc); 2078 guarantee(cb != NULL && cb->is_compiled(), "bad pc for a nmethod found"); 2079 _nm = cb->as_compiled_method(); 2080 lock_nmethod(_nm); 2081 } 2082 2083 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2084 // should pass zombie_ok == true. 2085 void nmethodLocker::lock_nmethod(CompiledMethod* cm, bool zombie_ok) { 2086 if (cm == NULL) return; 2087 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2088 nmethod* nm = cm->as_nmethod(); 2089 Atomic::inc(&nm->_lock_count); 2090 assert(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2091 } 2092 2093 void nmethodLocker::unlock_nmethod(CompiledMethod* cm) { 2094 if (cm == NULL) return; 2095 if (cm->is_aot()) return; // FIXME: Revisit once _lock_count is added to aot_method 2096 nmethod* nm = cm->as_nmethod(); 2097 Atomic::dec(&nm->_lock_count); 2098 assert(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2099 } 2100 2101 2102 // ----------------------------------------------------------------------------- 2103 // Verification 2104 2105 class VerifyOopsClosure: public OopClosure { 2106 nmethod* _nm; 2107 bool _ok; 2108 public: 2109 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2110 bool ok() { return _ok; } 2111 virtual void do_oop(oop* p) { 2112 if (oopDesc::is_oop_or_null(*p)) return; 2113 if (_ok) { 2114 _nm->print_nmethod(true); 2115 _ok = false; 2116 } 2117 tty->print_cr("*** non-oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2118 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2119 } 2120 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2121 }; 2122 2123 void nmethod::verify() { 2124 2125 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2126 // seems odd. 2127 2128 if (is_zombie() || is_not_entrant() || is_unloaded()) 2129 return; 2130 2131 // Make sure all the entry points are correctly aligned for patching. 2132 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2133 2134 // assert(oopDesc::is_oop(method()), "must be valid"); 2135 2136 ResourceMark rm; 2137 2138 if (!CodeCache::contains(this)) { 2139 fatal("nmethod at " INTPTR_FORMAT " not in zone", p2i(this)); 2140 } 2141 2142 if(is_native_method() ) 2143 return; 2144 2145 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2146 if (nm != this) { 2147 fatal("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", p2i(this)); 2148 } 2149 2150 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2151 if (! p->verify(this)) { 2152 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", p2i(this)); 2153 } 2154 } 2155 2156 VerifyOopsClosure voc(this); 2157 oops_do(&voc); 2158 assert(voc.ok(), "embedded oops must be OK"); 2159 Universe::heap()->verify_nmethod(this); 2160 2161 verify_scopes(); 2162 } 2163 2164 2165 void nmethod::verify_interrupt_point(address call_site) { 2166 // Verify IC only when nmethod installation is finished. 2167 if (!is_not_installed()) { 2168 if (CompiledICLocker::is_safe(this)) { 2169 CompiledIC_at(this, call_site); 2170 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2171 } else { 2172 CompiledICLocker ml_verify(this); 2173 CompiledIC_at(this, call_site); 2174 } 2175 } 2176 2177 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2178 assert(pd != NULL, "PcDesc must exist"); 2179 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2180 pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), 2181 pd->return_oop()); 2182 !sd->is_top(); sd = sd->sender()) { 2183 sd->verify(); 2184 } 2185 } 2186 2187 void nmethod::verify_scopes() { 2188 if( !method() ) return; // Runtime stubs have no scope 2189 if (method()->is_native()) return; // Ignore stub methods. 2190 // iterate through all interrupt point 2191 // and verify the debug information is valid. 2192 RelocIterator iter((nmethod*)this); 2193 while (iter.next()) { 2194 address stub = NULL; 2195 switch (iter.type()) { 2196 case relocInfo::virtual_call_type: 2197 verify_interrupt_point(iter.addr()); 2198 break; 2199 case relocInfo::opt_virtual_call_type: 2200 stub = iter.opt_virtual_call_reloc()->static_stub(false); 2201 verify_interrupt_point(iter.addr()); 2202 break; 2203 case relocInfo::static_call_type: 2204 stub = iter.static_call_reloc()->static_stub(false); 2205 //verify_interrupt_point(iter.addr()); 2206 break; 2207 case relocInfo::runtime_call_type: 2208 case relocInfo::runtime_call_w_cp_type: { 2209 address destination = iter.reloc()->value(); 2210 // Right now there is no way to find out which entries support 2211 // an interrupt point. It would be nice if we had this 2212 // information in a table. 2213 break; 2214 } 2215 default: 2216 break; 2217 } 2218 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2219 } 2220 } 2221 2222 2223 // ----------------------------------------------------------------------------- 2224 // Non-product code 2225 #ifndef PRODUCT 2226 2227 class DebugScavengeRoot: public OopClosure { 2228 nmethod* _nm; 2229 bool _ok; 2230 public: 2231 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2232 bool ok() { return _ok; } 2233 virtual void do_oop(oop* p) { 2234 if ((*p) == NULL || !Universe::heap()->is_scavengable(*p)) return; 2235 if (_ok) { 2236 _nm->print_nmethod(true); 2237 _ok = false; 2238 } 2239 tty->print_cr("*** scavengable oop " PTR_FORMAT " found at " PTR_FORMAT " (offset %d)", 2240 p2i(*p), p2i(p), (int)((intptr_t)p - (intptr_t)_nm)); 2241 (*p)->print(); 2242 } 2243 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2244 }; 2245 2246 void nmethod::verify_scavenge_root_oops() { 2247 if (!on_scavenge_root_list()) { 2248 // Actually look inside, to verify the claim that it's clean. 2249 DebugScavengeRoot debug_scavenge_root(this); 2250 oops_do(&debug_scavenge_root); 2251 if (!debug_scavenge_root.ok()) 2252 fatal("found an unadvertised bad scavengable oop in the code cache"); 2253 } 2254 assert(scavenge_root_not_marked(), ""); 2255 } 2256 2257 #endif // PRODUCT 2258 2259 // Printing operations 2260 2261 void nmethod::print() const { 2262 ResourceMark rm; 2263 ttyLocker ttyl; // keep the following output all in one block 2264 2265 tty->print("Compiled method "); 2266 2267 if (is_compiled_by_c1()) { 2268 tty->print("(c1) "); 2269 } else if (is_compiled_by_c2()) { 2270 tty->print("(c2) "); 2271 } else if (is_compiled_by_jvmci()) { 2272 tty->print("(JVMCI) "); 2273 } else { 2274 tty->print("(nm) "); 2275 } 2276 2277 print_on(tty, NULL); 2278 2279 if (WizardMode) { 2280 tty->print("((nmethod*) " INTPTR_FORMAT ") ", p2i(this)); 2281 tty->print(" for method " INTPTR_FORMAT , p2i(method())); 2282 tty->print(" { "); 2283 tty->print_cr("%s ", state()); 2284 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2285 tty->print_cr("}:"); 2286 } 2287 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2288 p2i(this), 2289 p2i(this) + size(), 2290 size()); 2291 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2292 p2i(relocation_begin()), 2293 p2i(relocation_end()), 2294 relocation_size()); 2295 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2296 p2i(consts_begin()), 2297 p2i(consts_end()), 2298 consts_size()); 2299 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2300 p2i(insts_begin()), 2301 p2i(insts_end()), 2302 insts_size()); 2303 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2304 p2i(stub_begin()), 2305 p2i(stub_end()), 2306 stub_size()); 2307 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2308 p2i(oops_begin()), 2309 p2i(oops_end()), 2310 oops_size()); 2311 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2312 p2i(metadata_begin()), 2313 p2i(metadata_end()), 2314 metadata_size()); 2315 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2316 p2i(scopes_data_begin()), 2317 p2i(scopes_data_end()), 2318 scopes_data_size()); 2319 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2320 p2i(scopes_pcs_begin()), 2321 p2i(scopes_pcs_end()), 2322 scopes_pcs_size()); 2323 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2324 p2i(dependencies_begin()), 2325 p2i(dependencies_end()), 2326 dependencies_size()); 2327 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2328 p2i(handler_table_begin()), 2329 p2i(handler_table_end()), 2330 handler_table_size()); 2331 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2332 p2i(nul_chk_table_begin()), 2333 p2i(nul_chk_table_end()), 2334 nul_chk_table_size()); 2335 } 2336 2337 #ifndef PRODUCT 2338 2339 void nmethod::print_scopes() { 2340 // Find the first pc desc for all scopes in the code and print it. 2341 ResourceMark rm; 2342 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2343 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2344 continue; 2345 2346 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2347 while (sd != NULL) { 2348 sd->print_on(tty, p); 2349 sd = sd->sender(); 2350 } 2351 } 2352 } 2353 2354 void nmethod::print_dependencies() { 2355 ResourceMark rm; 2356 ttyLocker ttyl; // keep the following output all in one block 2357 tty->print_cr("Dependencies:"); 2358 for (Dependencies::DepStream deps(this); deps.next(); ) { 2359 deps.print_dependency(); 2360 Klass* ctxk = deps.context_type(); 2361 if (ctxk != NULL) { 2362 if (ctxk->is_instance_klass() && InstanceKlass::cast(ctxk)->is_dependent_nmethod(this)) { 2363 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2364 } 2365 } 2366 deps.log_dependency(); // put it into the xml log also 2367 } 2368 } 2369 2370 2371 void nmethod::print_relocations() { 2372 ResourceMark m; // in case methods get printed via the debugger 2373 tty->print_cr("relocations:"); 2374 RelocIterator iter(this); 2375 iter.print(); 2376 } 2377 2378 2379 void nmethod::print_pcs() { 2380 ResourceMark m; // in case methods get printed via debugger 2381 tty->print_cr("pc-bytecode offsets:"); 2382 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2383 p->print(this); 2384 } 2385 } 2386 2387 void nmethod::print_recorded_oops() { 2388 tty->print_cr("Recorded oops:"); 2389 for (int i = 0; i < oops_count(); i++) { 2390 oop o = oop_at(i); 2391 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(o)); 2392 if (o == Universe::non_oop_word()) { 2393 tty->print("non-oop word"); 2394 } else { 2395 if (o != NULL) { 2396 o->print_value(); 2397 } else { 2398 tty->print_cr("NULL"); 2399 } 2400 } 2401 tty->cr(); 2402 } 2403 } 2404 2405 void nmethod::print_recorded_metadata() { 2406 tty->print_cr("Recorded metadata:"); 2407 for (int i = 0; i < metadata_count(); i++) { 2408 Metadata* m = metadata_at(i); 2409 tty->print("#%3d: " INTPTR_FORMAT " ", i, p2i(m)); 2410 if (m == (Metadata*)Universe::non_oop_word()) { 2411 tty->print("non-metadata word"); 2412 } else { 2413 Metadata::print_value_on_maybe_null(tty, m); 2414 } 2415 tty->cr(); 2416 } 2417 } 2418 2419 #endif // PRODUCT 2420 2421 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2422 RelocIterator iter(this, begin, end); 2423 bool have_one = false; 2424 while (iter.next()) { 2425 have_one = true; 2426 switch (iter.type()) { 2427 case relocInfo::none: return "no_reloc"; 2428 case relocInfo::oop_type: { 2429 stringStream st; 2430 oop_Relocation* r = iter.oop_reloc(); 2431 oop obj = r->oop_value(); 2432 st.print("oop("); 2433 if (obj == NULL) st.print("NULL"); 2434 else obj->print_value_on(&st); 2435 st.print(")"); 2436 return st.as_string(); 2437 } 2438 case relocInfo::metadata_type: { 2439 stringStream st; 2440 metadata_Relocation* r = iter.metadata_reloc(); 2441 Metadata* obj = r->metadata_value(); 2442 st.print("metadata("); 2443 if (obj == NULL) st.print("NULL"); 2444 else obj->print_value_on(&st); 2445 st.print(")"); 2446 return st.as_string(); 2447 } 2448 case relocInfo::runtime_call_type: 2449 case relocInfo::runtime_call_w_cp_type: { 2450 stringStream st; 2451 st.print("runtime_call"); 2452 CallRelocation* r = (CallRelocation*)iter.reloc(); 2453 address dest = r->destination(); 2454 CodeBlob* cb = CodeCache::find_blob(dest); 2455 if (cb != NULL) { 2456 st.print(" %s", cb->name()); 2457 } else { 2458 ResourceMark rm; 2459 const int buflen = 1024; 2460 char* buf = NEW_RESOURCE_ARRAY(char, buflen); 2461 int offset; 2462 if (os::dll_address_to_function_name(dest, buf, buflen, &offset)) { 2463 st.print(" %s", buf); 2464 if (offset != 0) { 2465 st.print("+%d", offset); 2466 } 2467 } 2468 } 2469 return st.as_string(); 2470 } 2471 case relocInfo::virtual_call_type: { 2472 stringStream st; 2473 st.print_raw("virtual_call"); 2474 virtual_call_Relocation* r = iter.virtual_call_reloc(); 2475 Method* m = r->method_value(); 2476 if (m != NULL) { 2477 assert(m->is_method(), ""); 2478 m->print_short_name(&st); 2479 } 2480 return st.as_string(); 2481 } 2482 case relocInfo::opt_virtual_call_type: { 2483 stringStream st; 2484 st.print_raw("optimized virtual_call"); 2485 opt_virtual_call_Relocation* r = iter.opt_virtual_call_reloc(); 2486 Method* m = r->method_value(); 2487 if (m != NULL) { 2488 assert(m->is_method(), ""); 2489 m->print_short_name(&st); 2490 } 2491 return st.as_string(); 2492 } 2493 case relocInfo::static_call_type: { 2494 stringStream st; 2495 st.print_raw("static_call"); 2496 static_call_Relocation* r = iter.static_call_reloc(); 2497 Method* m = r->method_value(); 2498 if (m != NULL) { 2499 assert(m->is_method(), ""); 2500 m->print_short_name(&st); 2501 } 2502 return st.as_string(); 2503 } 2504 case relocInfo::static_stub_type: return "static_stub"; 2505 case relocInfo::external_word_type: return "external_word"; 2506 case relocInfo::internal_word_type: return "internal_word"; 2507 case relocInfo::section_word_type: return "section_word"; 2508 case relocInfo::poll_type: return "poll"; 2509 case relocInfo::poll_return_type: return "poll_return"; 2510 case relocInfo::type_mask: return "type_bit_mask"; 2511 2512 default: 2513 break; 2514 } 2515 } 2516 return have_one ? "other" : NULL; 2517 } 2518 2519 // Return a the last scope in (begin..end] 2520 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2521 PcDesc* p = pc_desc_near(begin+1); 2522 if (p != NULL && p->real_pc(this) <= end) { 2523 return new ScopeDesc(this, p->scope_decode_offset(), 2524 p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), 2525 p->return_oop()); 2526 } 2527 return NULL; 2528 } 2529 2530 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2531 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2532 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2533 if (JVMCI_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2534 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2535 if (JVMCI_ONLY(_deopt_handler_begin != NULL &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2536 2537 if (has_method_handle_invokes()) 2538 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2539 2540 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2541 2542 if (block_begin == entry_point()) { 2543 methodHandle m = method(); 2544 if (m.not_null()) { 2545 stream->print(" # "); 2546 m->print_value_on(stream); 2547 stream->cr(); 2548 } 2549 if (m.not_null() && !is_osr_method()) { 2550 ResourceMark rm; 2551 int sizeargs = m->size_of_parameters(); 2552 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 2553 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 2554 { 2555 int sig_index = 0; 2556 if (!m->is_static()) 2557 sig_bt[sig_index++] = T_OBJECT; // 'this' 2558 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 2559 BasicType t = ss.type(); 2560 sig_bt[sig_index++] = t; 2561 if (type2size[t] == 2) { 2562 sig_bt[sig_index++] = T_VOID; 2563 } else { 2564 assert(type2size[t] == 1, "size is 1 or 2"); 2565 } 2566 } 2567 assert(sig_index == sizeargs, ""); 2568 } 2569 const char* spname = "sp"; // make arch-specific? 2570 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 2571 int stack_slot_offset = this->frame_size() * wordSize; 2572 int tab1 = 14, tab2 = 24; 2573 int sig_index = 0; 2574 int arg_index = (m->is_static() ? 0 : -1); 2575 bool did_old_sp = false; 2576 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 2577 bool at_this = (arg_index == -1); 2578 bool at_old_sp = false; 2579 BasicType t = (at_this ? T_OBJECT : ss.type()); 2580 assert(t == sig_bt[sig_index], "sigs in sync"); 2581 if (at_this) 2582 stream->print(" # this: "); 2583 else 2584 stream->print(" # parm%d: ", arg_index); 2585 stream->move_to(tab1); 2586 VMReg fst = regs[sig_index].first(); 2587 VMReg snd = regs[sig_index].second(); 2588 if (fst->is_reg()) { 2589 stream->print("%s", fst->name()); 2590 if (snd->is_valid()) { 2591 stream->print(":%s", snd->name()); 2592 } 2593 } else if (fst->is_stack()) { 2594 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 2595 if (offset == stack_slot_offset) at_old_sp = true; 2596 stream->print("[%s+0x%x]", spname, offset); 2597 } else { 2598 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 2599 } 2600 stream->print(" "); 2601 stream->move_to(tab2); 2602 stream->print("= "); 2603 if (at_this) { 2604 m->method_holder()->print_value_on(stream); 2605 } else { 2606 bool did_name = false; 2607 if (!at_this && ss.is_object()) { 2608 Symbol* name = ss.as_symbol_or_null(); 2609 if (name != NULL) { 2610 name->print_value_on(stream); 2611 did_name = true; 2612 } 2613 } 2614 if (!did_name) 2615 stream->print("%s", type2name(t)); 2616 } 2617 if (at_old_sp) { 2618 stream->print(" (%s of caller)", spname); 2619 did_old_sp = true; 2620 } 2621 stream->cr(); 2622 sig_index += type2size[t]; 2623 arg_index += 1; 2624 if (!at_this) ss.next(); 2625 } 2626 if (!did_old_sp) { 2627 stream->print(" # "); 2628 stream->move_to(tab1); 2629 stream->print("[%s+0x%x]", spname, stack_slot_offset); 2630 stream->print(" (%s of caller)", spname); 2631 stream->cr(); 2632 } 2633 } 2634 } 2635 } 2636 2637 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 2638 // First, find an oopmap in (begin, end]. 2639 // We use the odd half-closed interval so that oop maps and scope descs 2640 // which are tied to the byte after a call are printed with the call itself. 2641 address base = code_begin(); 2642 ImmutableOopMapSet* oms = oop_maps(); 2643 if (oms != NULL) { 2644 for (int i = 0, imax = oms->count(); i < imax; i++) { 2645 const ImmutableOopMapPair* pair = oms->pair_at(i); 2646 const ImmutableOopMap* om = pair->get_from(oms); 2647 address pc = base + pair->pc_offset(); 2648 if (pc > begin) { 2649 if (pc <= end) { 2650 st->move_to(column); 2651 st->print("; "); 2652 om->print_on(st); 2653 } 2654 break; 2655 } 2656 } 2657 } 2658 2659 // Print any debug info present at this pc. 2660 ScopeDesc* sd = scope_desc_in(begin, end); 2661 if (sd != NULL) { 2662 st->move_to(column); 2663 if (sd->bci() == SynchronizationEntryBCI) { 2664 st->print(";*synchronization entry"); 2665 } else if (sd->bci() == AfterBci) { 2666 st->print(";* method exit (unlocked if synchronized)"); 2667 } else if (sd->bci() == UnwindBci) { 2668 st->print(";* unwind (locked if synchronized)"); 2669 } else if (sd->bci() == AfterExceptionBci) { 2670 st->print(";* unwind (unlocked if synchronized)"); 2671 } else if (sd->bci() == UnknownBci) { 2672 st->print(";* unknown"); 2673 } else if (sd->bci() == InvalidFrameStateBci) { 2674 st->print(";* invalid frame state"); 2675 } else { 2676 if (sd->method() == NULL) { 2677 st->print("method is NULL"); 2678 } else if (sd->method()->is_native()) { 2679 st->print("method is native"); 2680 } else { 2681 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 2682 st->print(";*%s", Bytecodes::name(bc)); 2683 switch (bc) { 2684 case Bytecodes::_invokevirtual: 2685 case Bytecodes::_invokespecial: 2686 case Bytecodes::_invokestatic: 2687 case Bytecodes::_invokeinterface: 2688 { 2689 Bytecode_invoke invoke(sd->method(), sd->bci()); 2690 st->print(" "); 2691 if (invoke.name() != NULL) 2692 invoke.name()->print_symbol_on(st); 2693 else 2694 st->print("<UNKNOWN>"); 2695 break; 2696 } 2697 case Bytecodes::_getfield: 2698 case Bytecodes::_putfield: 2699 case Bytecodes::_getstatic: 2700 case Bytecodes::_putstatic: 2701 { 2702 Bytecode_field field(sd->method(), sd->bci()); 2703 st->print(" "); 2704 if (field.name() != NULL) 2705 field.name()->print_symbol_on(st); 2706 else 2707 st->print("<UNKNOWN>"); 2708 } 2709 default: 2710 break; 2711 } 2712 } 2713 st->print(" {reexecute=%d rethrow=%d return_oop=%d}", sd->should_reexecute(), sd->rethrow_exception(), sd->return_oop()); 2714 } 2715 2716 // Print all scopes 2717 for (;sd != NULL; sd = sd->sender()) { 2718 st->move_to(column); 2719 st->print("; -"); 2720 if (sd->method() == NULL) { 2721 st->print("method is NULL"); 2722 } else { 2723 sd->method()->print_short_name(st); 2724 } 2725 int lineno = sd->method()->line_number_from_bci(sd->bci()); 2726 if (lineno != -1) { 2727 st->print("@%d (line %d)", sd->bci(), lineno); 2728 } else { 2729 st->print("@%d", sd->bci()); 2730 } 2731 st->cr(); 2732 } 2733 } 2734 2735 // Print relocation information 2736 const char* str = reloc_string_for(begin, end); 2737 if (str != NULL) { 2738 if (sd != NULL) st->cr(); 2739 st->move_to(column); 2740 st->print("; {%s}", str); 2741 } 2742 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 2743 if (cont_offset != 0) { 2744 st->move_to(column); 2745 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, p2i(code_begin() + cont_offset)); 2746 } 2747 2748 } 2749 2750 class DirectNativeCallWrapper: public NativeCallWrapper { 2751 private: 2752 NativeCall* _call; 2753 2754 public: 2755 DirectNativeCallWrapper(NativeCall* call) : _call(call) {} 2756 2757 virtual address destination() const { return _call->destination(); } 2758 virtual address instruction_address() const { return _call->instruction_address(); } 2759 virtual address next_instruction_address() const { return _call->next_instruction_address(); } 2760 virtual address return_address() const { return _call->return_address(); } 2761 2762 virtual address get_resolve_call_stub(bool is_optimized) const { 2763 if (is_optimized) { 2764 return SharedRuntime::get_resolve_opt_virtual_call_stub(); 2765 } 2766 return SharedRuntime::get_resolve_virtual_call_stub(); 2767 } 2768 2769 virtual void set_destination_mt_safe(address dest) { 2770 #if INCLUDE_AOT 2771 if (UseAOT) { 2772 CodeBlob* callee = CodeCache::find_blob(dest); 2773 CompiledMethod* cm = callee->as_compiled_method_or_null(); 2774 if (cm != NULL && cm->is_far_code()) { 2775 // Temporary fix, see JDK-8143106 2776 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2777 csc->set_to_far(methodHandle(cm->method()), dest); 2778 return; 2779 } 2780 } 2781 #endif 2782 _call->set_destination_mt_safe(dest); 2783 } 2784 2785 virtual void set_to_interpreted(const methodHandle& method, CompiledICInfo& info) { 2786 CompiledDirectStaticCall* csc = CompiledDirectStaticCall::at(instruction_address()); 2787 #if INCLUDE_AOT 2788 if (info.to_aot()) { 2789 csc->set_to_far(method, info.entry()); 2790 } else 2791 #endif 2792 { 2793 csc->set_to_interpreted(method, info.entry()); 2794 } 2795 } 2796 2797 virtual void verify() const { 2798 // make sure code pattern is actually a call imm32 instruction 2799 _call->verify(); 2800 _call->verify_alignment(); 2801 } 2802 2803 virtual void verify_resolve_call(address dest) const { 2804 CodeBlob* db = CodeCache::find_blob_unsafe(dest); 2805 assert(db != NULL && !db->is_adapter_blob(), "must use stub!"); 2806 } 2807 2808 virtual bool is_call_to_interpreted(address dest) const { 2809 CodeBlob* cb = CodeCache::find_blob(_call->instruction_address()); 2810 return cb->contains(dest); 2811 } 2812 2813 virtual bool is_safe_for_patching() const { return false; } 2814 2815 virtual NativeInstruction* get_load_instruction(virtual_call_Relocation* r) const { 2816 return nativeMovConstReg_at(r->cached_value()); 2817 } 2818 2819 virtual void *get_data(NativeInstruction* instruction) const { 2820 return (void*)((NativeMovConstReg*) instruction)->data(); 2821 } 2822 2823 virtual void set_data(NativeInstruction* instruction, intptr_t data) { 2824 ((NativeMovConstReg*) instruction)->set_data(data); 2825 } 2826 }; 2827 2828 NativeCallWrapper* nmethod::call_wrapper_at(address call) const { 2829 return new DirectNativeCallWrapper((NativeCall*) call); 2830 } 2831 2832 NativeCallWrapper* nmethod::call_wrapper_before(address return_pc) const { 2833 return new DirectNativeCallWrapper(nativeCall_before(return_pc)); 2834 } 2835 2836 address nmethod::call_instruction_address(address pc) const { 2837 if (NativeCall::is_call_before(pc)) { 2838 NativeCall *ncall = nativeCall_before(pc); 2839 return ncall->instruction_address(); 2840 } 2841 return NULL; 2842 } 2843 2844 CompiledStaticCall* nmethod::compiledStaticCall_at(Relocation* call_site) const { 2845 return CompiledDirectStaticCall::at(call_site); 2846 } 2847 2848 CompiledStaticCall* nmethod::compiledStaticCall_at(address call_site) const { 2849 return CompiledDirectStaticCall::at(call_site); 2850 } 2851 2852 CompiledStaticCall* nmethod::compiledStaticCall_before(address return_addr) const { 2853 return CompiledDirectStaticCall::before(return_addr); 2854 } 2855 2856 #ifndef PRODUCT 2857 2858 void nmethod::print_value_on(outputStream* st) const { 2859 st->print("nmethod"); 2860 print_on(st, NULL); 2861 } 2862 2863 void nmethod::print_calls(outputStream* st) { 2864 RelocIterator iter(this); 2865 while (iter.next()) { 2866 switch (iter.type()) { 2867 case relocInfo::virtual_call_type: 2868 case relocInfo::opt_virtual_call_type: { 2869 CompiledICLocker ml_verify(this); 2870 CompiledIC_at(&iter)->print(); 2871 break; 2872 } 2873 case relocInfo::static_call_type: 2874 st->print_cr("Static call at " INTPTR_FORMAT, p2i(iter.reloc()->addr())); 2875 CompiledDirectStaticCall::at(iter.reloc())->print(); 2876 break; 2877 default: 2878 break; 2879 } 2880 } 2881 } 2882 2883 void nmethod::print_handler_table() { 2884 ExceptionHandlerTable(this).print(); 2885 } 2886 2887 void nmethod::print_nul_chk_table() { 2888 ImplicitExceptionTable(this).print(code_begin()); 2889 } 2890 2891 void nmethod::print_statistics() { 2892 ttyLocker ttyl; 2893 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 2894 native_nmethod_stats.print_native_nmethod_stats(); 2895 #ifdef COMPILER1 2896 c1_java_nmethod_stats.print_nmethod_stats("C1"); 2897 #endif 2898 #ifdef COMPILER2 2899 c2_java_nmethod_stats.print_nmethod_stats("C2"); 2900 #endif 2901 #if INCLUDE_JVMCI 2902 jvmci_java_nmethod_stats.print_nmethod_stats("JVMCI"); 2903 #endif 2904 unknown_java_nmethod_stats.print_nmethod_stats("Unknown"); 2905 DebugInformationRecorder::print_statistics(); 2906 #ifndef PRODUCT 2907 pc_nmethod_stats.print_pc_stats(); 2908 #endif 2909 Dependencies::print_statistics(); 2910 if (xtty != NULL) xtty->tail("statistics"); 2911 } 2912 2913 #endif // !PRODUCT 2914 2915 #if INCLUDE_JVMCI 2916 void nmethod::clear_jvmci_installed_code() { 2917 assert_locked_or_safepoint(Patching_lock); 2918 if (_jvmci_installed_code != NULL) { 2919 JNIHandles::destroy_weak_global(_jvmci_installed_code); 2920 _jvmci_installed_code = NULL; 2921 } 2922 } 2923 2924 void nmethod::clear_speculation_log() { 2925 assert_locked_or_safepoint(Patching_lock); 2926 if (_speculation_log != NULL) { 2927 JNIHandles::destroy_weak_global(_speculation_log); 2928 _speculation_log = NULL; 2929 } 2930 } 2931 2932 void nmethod::maybe_invalidate_installed_code() { 2933 assert(Patching_lock->is_locked() || 2934 SafepointSynchronize::is_at_safepoint(), "should be performed under a lock for consistency"); 2935 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 2936 if (installed_code != NULL) { 2937 // Update the values in the InstalledCode instance if it still refers to this nmethod 2938 nmethod* nm = (nmethod*)InstalledCode::address(installed_code); 2939 if (nm == this) { 2940 if (!is_alive() || is_unloading()) { 2941 // Break the link between nmethod and InstalledCode such that the nmethod 2942 // can subsequently be flushed safely. The link must be maintained while 2943 // the method could have live activations since invalidateInstalledCode 2944 // might want to invalidate all existing activations. 2945 InstalledCode::set_address(installed_code, 0); 2946 InstalledCode::set_entryPoint(installed_code, 0); 2947 } else if (is_not_entrant()) { 2948 // Remove the entry point so any invocation will fail but keep 2949 // the address link around that so that existing activations can 2950 // be invalidated. 2951 InstalledCode::set_entryPoint(installed_code, 0); 2952 } 2953 } 2954 } 2955 if (!is_alive() || is_unloading()) { 2956 // Clear these out after the nmethod has been unregistered and any 2957 // updates to the InstalledCode instance have been performed. 2958 clear_jvmci_installed_code(); 2959 clear_speculation_log(); 2960 } 2961 } 2962 2963 void nmethod::invalidate_installed_code(Handle installedCode, TRAPS) { 2964 if (installedCode() == NULL) { 2965 THROW(vmSymbols::java_lang_NullPointerException()); 2966 } 2967 jlong nativeMethod = InstalledCode::address(installedCode); 2968 nmethod* nm = (nmethod*)nativeMethod; 2969 if (nm == NULL) { 2970 // Nothing to do 2971 return; 2972 } 2973 2974 nmethodLocker nml(nm); 2975 #ifdef ASSERT 2976 { 2977 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2978 // This relationship can only be checked safely under a lock 2979 assert(!nm->is_alive() || nm->is_unloading() || nm->jvmci_installed_code() == installedCode(), "sanity check"); 2980 } 2981 #endif 2982 2983 if (nm->is_alive()) { 2984 // Invalidating the InstalledCode means we want the nmethod 2985 // to be deoptimized. 2986 nm->mark_for_deoptimization(); 2987 VM_Deoptimize op; 2988 VMThread::execute(&op); 2989 } 2990 2991 // Multiple threads could reach this point so we now need to 2992 // lock and re-check the link to the nmethod so that only one 2993 // thread clears it. 2994 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 2995 if (InstalledCode::address(installedCode) == nativeMethod) { 2996 InstalledCode::set_address(installedCode, 0); 2997 } 2998 } 2999 3000 oop nmethod::jvmci_installed_code() { 3001 return JNIHandles::resolve(_jvmci_installed_code); 3002 } 3003 3004 oop nmethod::speculation_log() { 3005 return JNIHandles::resolve(_speculation_log); 3006 } 3007 3008 char* nmethod::jvmci_installed_code_name(char* buf, size_t buflen) const { 3009 if (!this->is_compiled_by_jvmci()) { 3010 return NULL; 3011 } 3012 oop installed_code = JNIHandles::resolve(_jvmci_installed_code); 3013 if (installed_code != NULL) { 3014 oop installed_code_name = NULL; 3015 if (installed_code->is_a(InstalledCode::klass())) { 3016 installed_code_name = InstalledCode::name(installed_code); 3017 } 3018 if (installed_code_name != NULL) { 3019 return java_lang_String::as_utf8_string(installed_code_name, buf, (int)buflen); 3020 } 3021 } 3022 return NULL; 3023 } 3024 #endif