1 /* 2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "cds/cds_globals.hpp" 28 #include "cds/cdsConfig.hpp" 29 #include "cds/metaspaceShared.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/javaThreadStatus.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmClasses.hpp" 35 #include "classfile/vmSymbols.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "compiler/compileTask.hpp" 38 #include "compiler/compilerThread.hpp" 39 #include "gc/shared/barrierSet.hpp" 40 #include "gc/shared/barrierSetNMethod.hpp" 41 #include "gc/shared/gcVMOperations.hpp" 42 #include "gc/shared/oopStorage.hpp" 43 #include "gc/shared/oopStorageSet.hpp" 44 #include "gc/shared/stringdedup/stringDedup.hpp" 45 #include "jfr/jfrEvents.hpp" 46 #include "jvm.h" 47 #include "jvmtifiles/jvmtiEnv.hpp" 48 #include "logging/log.hpp" 49 #include "logging/logAsyncWriter.hpp" 50 #include "logging/logConfiguration.hpp" 51 #include "memory/allocation.inline.hpp" 52 #include "memory/iterator.hpp" 53 #include "memory/oopFactory.hpp" 54 #include "memory/resourceArea.hpp" 55 #include "memory/universe.hpp" 56 #include "nmt/memTracker.hpp" 57 #include "oops/instanceKlass.hpp" 58 #include "oops/klass.inline.hpp" 59 #include "oops/oop.inline.hpp" 60 #include "oops/symbol.hpp" 61 #include "prims/jvm_misc.hpp" 62 #include "prims/jvmtiAgentList.hpp" 63 #include "prims/jvmtiEnvBase.hpp" 64 #include "runtime/arguments.hpp" 65 #include "runtime/fieldDescriptor.inline.hpp" 66 #include "runtime/flags/jvmFlagLimit.hpp" 67 #include "runtime/globals.hpp" 68 #include "runtime/globals_extension.hpp" 69 #include "runtime/handles.inline.hpp" 70 #include "runtime/interfaceSupport.inline.hpp" 71 #include "runtime/java.hpp" 72 #include "runtime/javaCalls.hpp" 73 #include "runtime/javaThread.inline.hpp" 74 #include "runtime/jniHandles.inline.hpp" 75 #include "runtime/jniPeriodicChecker.hpp" 76 #include "runtime/lockStack.inline.hpp" 77 #include "runtime/monitorDeflationThread.hpp" 78 #include "runtime/mutexLocker.hpp" 79 #include "runtime/nonJavaThread.hpp" 80 #include "runtime/objectMonitor.inline.hpp" 81 #include "runtime/osThread.hpp" 82 #include "runtime/safepoint.hpp" 83 #include "runtime/safepointMechanism.inline.hpp" 84 #include "runtime/safepointVerifiers.hpp" 85 #include "runtime/serviceThread.hpp" 86 #include "runtime/sharedRuntime.hpp" 87 #include "runtime/stackWatermarkSet.inline.hpp" 88 #include "runtime/statSampler.hpp" 89 #include "runtime/stubCodeGenerator.hpp" 90 #include "runtime/thread.inline.hpp" 91 #include "runtime/threadSMR.inline.hpp" 92 #include "runtime/threads.hpp" 93 #include "runtime/timer.hpp" 94 #include "runtime/timerTrace.hpp" 95 #include "runtime/trimNativeHeap.hpp" 96 #include "runtime/vmOperations.hpp" 97 #include "runtime/vm_version.hpp" 98 #include "services/attachListener.hpp" 99 #include "services/management.hpp" 100 #include "services/threadIdTable.hpp" 101 #include "services/threadService.hpp" 102 #include "utilities/dtrace.hpp" 103 #include "utilities/events.hpp" 104 #include "utilities/macros.hpp" 105 #include "utilities/vmError.hpp" 106 #if INCLUDE_JVMCI 107 #include "jvmci/jvmci.hpp" 108 #include "jvmci/jvmciEnv.hpp" 109 #endif 110 #ifdef COMPILER2 111 #include "opto/idealGraphPrinter.hpp" 112 #endif 113 #if INCLUDE_JFR 114 #include "jfr/jfr.hpp" 115 #endif 116 117 // Initialization after module runtime initialization 118 void universe_post_module_init(); // must happen after call_initPhase2 119 120 121 static void initialize_class(Symbol* class_name, TRAPS) { 122 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); 123 InstanceKlass::cast(klass)->initialize(CHECK); 124 } 125 126 127 // Creates the initial ThreadGroup 128 static Handle create_initial_thread_group(TRAPS) { 129 Handle system_instance = JavaCalls::construct_new_instance( 130 vmClasses::ThreadGroup_klass(), 131 vmSymbols::void_method_signature(), 132 CHECK_NH); 133 Universe::set_system_thread_group(system_instance()); 134 135 Handle string = java_lang_String::create_from_str("main", CHECK_NH); 136 Handle main_instance = JavaCalls::construct_new_instance( 137 vmClasses::ThreadGroup_klass(), 138 vmSymbols::threadgroup_string_void_signature(), 139 system_instance, 140 string, 141 CHECK_NH); 142 return main_instance; 143 } 144 145 // Creates the initial Thread, and sets it to running. 146 static void create_initial_thread(Handle thread_group, JavaThread* thread, 147 TRAPS) { 148 InstanceKlass* ik = vmClasses::Thread_klass(); 149 assert(ik->is_initialized(), "must be"); 150 instanceHandle thread_oop = ik->allocate_instance_handle(CHECK); 151 152 // Cannot use JavaCalls::construct_new_instance because the java.lang.Thread 153 // constructor calls Thread.current(), which must be set here for the 154 // initial thread. 155 java_lang_Thread::set_thread(thread_oop(), thread); 156 thread->set_threadOopHandles(thread_oop()); 157 158 Handle string = java_lang_String::create_from_str("main", CHECK); 159 160 JavaValue result(T_VOID); 161 JavaCalls::call_special(&result, thread_oop, 162 ik, 163 vmSymbols::object_initializer_name(), 164 vmSymbols::threadgroup_string_void_signature(), 165 thread_group, 166 string, 167 CHECK); 168 169 assert(thread->lock_id() == ThreadIdentifier::initial(), "invariant"); 170 171 // Set thread status to running since main thread has 172 // been started and running. 173 java_lang_Thread::set_thread_status(thread_oop(), 174 JavaThreadStatus::RUNNABLE); 175 } 176 177 // Extract version and vendor specific information from 178 // java.lang.VersionProps fields. 179 // Returned char* is allocated in the thread's resource area 180 // so must be copied for permanency. 181 static const char* get_java_version_info(InstanceKlass* ik, 182 Symbol* field_name) { 183 fieldDescriptor fd; 184 bool found = ik != nullptr && 185 ik->find_local_field(field_name, 186 vmSymbols::string_signature(), &fd); 187 if (found) { 188 oop name_oop = ik->java_mirror()->obj_field(fd.offset()); 189 if (name_oop == nullptr) { 190 return nullptr; 191 } 192 const char* name = java_lang_String::as_utf8_string(name_oop); 193 return name; 194 } else { 195 return nullptr; 196 } 197 } 198 199 // ======= Threads ======== 200 201 // The Threads class links together all active threads, and provides 202 // operations over all threads. It is protected by the Threads_lock, 203 // which is also used in other global contexts like safepointing. 204 // ThreadsListHandles are used to safely perform operations on one 205 // or more threads without the risk of the thread exiting during the 206 // operation. 207 // 208 // Note: The Threads_lock is currently more widely used than we 209 // would like. We are actively migrating Threads_lock uses to other 210 // mechanisms in order to reduce Threads_lock contention. 211 212 int Threads::_number_of_threads = 0; 213 int Threads::_number_of_non_daemon_threads = 0; 214 int Threads::_return_code = 0; 215 uintx Threads::_thread_claim_token = 1; // Never zero. 216 217 #ifdef ASSERT 218 bool Threads::_vm_complete = false; 219 #endif 220 221 // General purpose hook into Java code, run once when the VM is initialized. 222 // The Java library method itself may be changed independently from the VM. 223 static void call_postVMInitHook(TRAPS) { 224 Klass* klass = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_vm_PostVMInitHook(), THREAD); 225 if (klass != nullptr) { 226 JavaValue result(T_VOID); 227 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), 228 vmSymbols::void_method_signature(), 229 CHECK); 230 } 231 } 232 233 // All NonJavaThreads (i.e., every non-JavaThread in the system). 234 void Threads::non_java_threads_do(ThreadClosure* tc) { 235 NoSafepointVerifier nsv; 236 for (NonJavaThread::Iterator njti; !njti.end(); njti.step()) { 237 tc->do_thread(njti.current()); 238 } 239 } 240 241 // All JavaThreads 242 #define ALL_JAVA_THREADS(X) \ 243 for (JavaThread* X : *ThreadsSMRSupport::get_java_thread_list()) 244 245 // All JavaThreads 246 void Threads::java_threads_do(ThreadClosure* tc) { 247 assert_locked_or_safepoint(Threads_lock); 248 // ALL_JAVA_THREADS iterates through all JavaThreads. 249 ALL_JAVA_THREADS(p) { 250 tc->do_thread(p); 251 } 252 } 253 254 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system). 255 void Threads::threads_do(ThreadClosure* tc) { 256 assert_locked_or_safepoint(Threads_lock); 257 java_threads_do(tc); 258 non_java_threads_do(tc); 259 } 260 261 void Threads::possibly_parallel_threads_do(bool is_par, ThreadClosure* tc) { 262 assert_at_safepoint(); 263 264 uintx claim_token = Threads::thread_claim_token(); 265 ALL_JAVA_THREADS(p) { 266 if (p->claim_threads_do(is_par, claim_token)) { 267 tc->do_thread(p); 268 } 269 } 270 for (NonJavaThread::Iterator njti; !njti.end(); njti.step()) { 271 Thread* current = njti.current(); 272 if (current->claim_threads_do(is_par, claim_token)) { 273 tc->do_thread(current); 274 } 275 } 276 } 277 278 // The system initialization in the library has three phases. 279 // 280 // Phase 1: java.lang.System class initialization 281 // java.lang.System is a primordial class loaded and initialized 282 // by the VM early during startup. java.lang.System.<clinit> 283 // only does registerNatives and keeps the rest of the class 284 // initialization work later until thread initialization completes. 285 // 286 // System.initPhase1 initializes the system properties, the static 287 // fields in, out, and err. Set up java signal handlers, OS-specific 288 // system settings, and thread group of the main thread. 289 static void call_initPhase1(TRAPS) { 290 Klass* klass = vmClasses::System_klass(); 291 JavaValue result(T_VOID); 292 JavaCalls::call_static(&result, klass, vmSymbols::initPhase1_name(), 293 vmSymbols::void_method_signature(), CHECK); 294 } 295 296 // Phase 2. Module system initialization 297 // This will initialize the module system. Only java.base classes 298 // can be loaded until phase 2 completes. 299 // 300 // Call System.initPhase2 after the compiler initialization and jsr292 301 // classes get initialized because module initialization runs a lot of java 302 // code, that for performance reasons, should be compiled. Also, this will 303 // enable the startup code to use lambda and other language features in this 304 // phase and onward. 305 // 306 // After phase 2, The VM will begin search classes from -Xbootclasspath/a. 307 static void call_initPhase2(TRAPS) { 308 TraceTime timer("Initialize module system", TRACETIME_LOG(Info, startuptime)); 309 310 Klass* klass = vmClasses::System_klass(); 311 312 JavaValue result(T_INT); 313 JavaCallArguments args; 314 args.push_int(DisplayVMOutputToStderr); 315 args.push_int(log_is_enabled(Debug, init)); // print stack trace if exception thrown 316 JavaCalls::call_static(&result, klass, vmSymbols::initPhase2_name(), 317 vmSymbols::boolean_boolean_int_signature(), &args, CHECK); 318 if (result.get_jint() != JNI_OK) { 319 vm_exit_during_initialization(); // no message or exception 320 } 321 322 universe_post_module_init(); 323 } 324 325 // Phase 3. final setup - set security manager, system class loader and TCCL 326 // 327 // This will instantiate and set the security manager, set the system class 328 // loader as well as the thread context class loader. The security manager 329 // and system class loader may be a custom class loaded from -Xbootclasspath/a, 330 // other modules or the application's classpath. 331 static void call_initPhase3(TRAPS) { 332 Klass* klass = vmClasses::System_klass(); 333 JavaValue result(T_VOID); 334 JavaCalls::call_static(&result, klass, vmSymbols::initPhase3_name(), 335 vmSymbols::void_method_signature(), CHECK); 336 } 337 338 void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) { 339 TraceTime timer("Initialize java.lang classes", TRACETIME_LOG(Info, startuptime)); 340 341 initialize_class(vmSymbols::java_lang_String(), CHECK); 342 343 // Inject CompactStrings value after the static initializers for String ran. 344 java_lang_String::set_compact_strings(CompactStrings); 345 346 // Initialize java_lang.System (needed before creating the thread) 347 initialize_class(vmSymbols::java_lang_System(), CHECK); 348 // The VM creates & returns objects of this class. Make sure it's initialized. 349 initialize_class(vmSymbols::java_lang_Class(), CHECK); 350 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK); 351 Handle thread_group = create_initial_thread_group(CHECK); 352 Universe::set_main_thread_group(thread_group()); 353 initialize_class(vmSymbols::java_lang_Thread(), CHECK); 354 create_initial_thread(thread_group, main_thread, CHECK); 355 356 // The VM creates objects of this class. 357 initialize_class(vmSymbols::java_lang_Module(), CHECK); 358 359 #ifdef ASSERT 360 InstanceKlass *k = vmClasses::UnsafeConstants_klass(); 361 assert(k->is_not_initialized(), "UnsafeConstants should not already be initialized"); 362 #endif 363 364 // initialize the hardware-specific constants needed by Unsafe 365 initialize_class(vmSymbols::jdk_internal_misc_UnsafeConstants(), CHECK); 366 jdk_internal_misc_UnsafeConstants::set_unsafe_constants(); 367 368 // The VM preresolves methods to these classes. Make sure that they get initialized 369 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK); 370 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK); 371 372 // Phase 1 of the system initialization in the library, java.lang.System class initialization 373 call_initPhase1(CHECK); 374 375 // Get the Java runtime name, version, and vendor info after java.lang.System is initialized. 376 // Some values are actually configure-time constants but some can be set via the jlink tool and 377 // so must be read dynamically. We treat them all the same. 378 InstanceKlass* ik = SystemDictionary::find_instance_klass(THREAD, vmSymbols::java_lang_VersionProps(), 379 Handle(), Handle()); 380 { 381 ResourceMark rm(main_thread); 382 JDK_Version::set_java_version(get_java_version_info(ik, vmSymbols::java_version_name())); 383 384 JDK_Version::set_runtime_name(get_java_version_info(ik, vmSymbols::java_runtime_name_name())); 385 386 JDK_Version::set_runtime_version(get_java_version_info(ik, vmSymbols::java_runtime_version_name())); 387 388 JDK_Version::set_runtime_vendor_version(get_java_version_info(ik, vmSymbols::java_runtime_vendor_version_name())); 389 390 JDK_Version::set_runtime_vendor_vm_bug_url(get_java_version_info(ik, vmSymbols::java_runtime_vendor_vm_bug_url_name())); 391 } 392 393 // an instance of OutOfMemory exception has been allocated earlier 394 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK); 395 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK); 396 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK); 397 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK); 398 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK); 399 initialize_class(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK); 400 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK); 401 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK); 402 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK); 403 } 404 405 void Threads::initialize_jsr292_core_classes(TRAPS) { 406 TraceTime timer("Initialize java.lang.invoke classes", TRACETIME_LOG(Info, startuptime)); 407 408 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK); 409 initialize_class(vmSymbols::java_lang_invoke_ResolvedMethodName(), CHECK); 410 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK); 411 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK); 412 } 413 414 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { 415 extern void JDK_Version_init(); 416 417 // Preinitialize version info. 418 VM_Version::early_initialize(); 419 420 // Check version 421 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; 422 423 // Initialize library-based TLS 424 ThreadLocalStorage::init(); 425 426 // Initialize the output stream module 427 ostream_init(); 428 429 // Process java launcher properties. 430 Arguments::process_sun_java_launcher_properties(args); 431 432 // Initialize the os module 433 os::init(); 434 435 MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXWrite)); 436 437 // Record VM creation timing statistics 438 TraceVmCreationTime create_vm_timer; 439 create_vm_timer.start(); 440 441 // Initialize system properties. 442 Arguments::init_system_properties(); 443 444 // So that JDK version can be used as a discriminator when parsing arguments 445 JDK_Version_init(); 446 447 // Update/Initialize System properties after JDK version number is known 448 Arguments::init_version_specific_system_properties(); 449 450 // Make sure to initialize log configuration *before* parsing arguments 451 LogConfiguration::initialize(create_vm_timer.begin_time()); 452 453 // Parse arguments 454 // Note: this internally calls os::init_container_support() 455 jint parse_result = Arguments::parse(args); 456 if (parse_result != JNI_OK) return parse_result; 457 458 // Initialize NMT right after argument parsing to keep the pre-NMT-init window small. 459 MemTracker::initialize(); 460 461 os::init_before_ergo(); 462 463 jint ergo_result = Arguments::apply_ergo(); 464 if (ergo_result != JNI_OK) return ergo_result; 465 466 // Final check of all ranges after ergonomics which may change values. 467 if (!JVMFlagLimit::check_all_ranges()) { 468 return JNI_EINVAL; 469 } 470 471 // Final check of all 'AfterErgo' constraints after ergonomics which may change values. 472 bool constraint_result = JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterErgo); 473 if (!constraint_result) { 474 return JNI_EINVAL; 475 } 476 477 if (PauseAtStartup) { 478 os::pause(); 479 } 480 481 HOTSPOT_VM_INIT_BEGIN(); 482 483 // Timing (must come after argument parsing) 484 TraceTime timer("Create VM", TRACETIME_LOG(Info, startuptime)); 485 486 // Initialize the os module after parsing the args 487 jint os_init_2_result = os::init_2(); 488 if (os_init_2_result != JNI_OK) return os_init_2_result; 489 490 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT 491 // Initialize assert poison page mechanism. 492 if (ShowRegistersOnAssert) { 493 initialize_assert_poison(); 494 } 495 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 496 497 SafepointMechanism::initialize(); 498 499 jint adjust_after_os_result = Arguments::adjust_after_os(); 500 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; 501 502 // Initialize output stream logging 503 ostream_init_log(); 504 505 // Launch -agentlib/-agentpath and converted -Xrun agents 506 JvmtiAgentList::load_agents(); 507 508 // Initialize Threads state 509 _number_of_threads = 0; 510 _number_of_non_daemon_threads = 0; 511 512 // Initialize global data structures and create system classes in heap 513 vm_init_globals(); 514 515 #if INCLUDE_JVMCI 516 if (JVMCICounterSize > 0) { 517 JavaThread::_jvmci_old_thread_counters = NEW_C_HEAP_ARRAY(jlong, JVMCICounterSize, mtJVMCI); 518 memset(JavaThread::_jvmci_old_thread_counters, 0, sizeof(jlong) * JVMCICounterSize); 519 } else { 520 JavaThread::_jvmci_old_thread_counters = nullptr; 521 } 522 #endif // INCLUDE_JVMCI 523 524 // Initialize OopStorage for threadObj 525 JavaThread::_thread_oop_storage = OopStorageSet::create_strong("Thread OopStorage", mtThread); 526 527 // Attach the main thread to this os thread 528 JavaThread* main_thread = new JavaThread(); 529 main_thread->set_thread_state(_thread_in_vm); 530 main_thread->initialize_thread_current(); 531 // must do this before set_active_handles 532 main_thread->record_stack_base_and_size(); 533 main_thread->register_thread_stack_with_NMT(); 534 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); 535 MACOS_AARCH64_ONLY(main_thread->init_wx()); 536 537 // Set the lock_id now since we will run Java code before the Thread instance 538 // is even created. The same value will be assigned to the Thread instance on init. 539 main_thread->set_lock_id(ThreadIdentifier::next()); 540 assert(main_thread->lock_id() == ThreadIdentifier::initial(), "invariant"); 541 542 if (!main_thread->set_as_starting_thread()) { 543 vm_shutdown_during_initialization( 544 "Failed necessary internal allocation. Out of swap space"); 545 main_thread->smr_delete(); 546 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again 547 return JNI_ENOMEM; 548 } 549 550 // Enable guard page *after* os::create_main_thread(), otherwise it would 551 // crash Linux VM, see notes in os_linux.cpp. 552 main_thread->stack_overflow_state()->create_stack_guard_pages(); 553 554 // Initialize Java-Level synchronization subsystem 555 ObjectMonitor::Initialize(); 556 ObjectSynchronizer::initialize(); 557 558 // Initialize global modules 559 jint status = init_globals(); 560 if (status != JNI_OK) { 561 main_thread->smr_delete(); 562 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again 563 return status; 564 } 565 566 // Create WatcherThread as soon as we can since we need it in case 567 // of hangs during error reporting. 568 WatcherThread::start(); 569 570 // Add main_thread to threads list to finish barrier setup with 571 // on_thread_attach. Should be before starting to build Java objects in 572 // init_globals2, which invokes barriers. 573 { 574 MutexLocker mu(Threads_lock); 575 Threads::add(main_thread); 576 } 577 578 status = init_globals2(); 579 if (status != JNI_OK) { 580 Threads::remove(main_thread, false); 581 // It is possible that we managed to fully initialize Universe but have then 582 // failed by throwing an exception. In that case our caller JNI_CreateJavaVM 583 // will want to report it, so we can't delete the main thread. 584 if (!main_thread->has_pending_exception()) { 585 main_thread->smr_delete(); 586 } 587 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again 588 return status; 589 } 590 591 ObjectMonitor::Initialize2(); 592 593 JFR_ONLY(Jfr::on_create_vm_1();) 594 595 // Should be done after the heap is fully created 596 main_thread->cache_global_variables(); 597 598 // Any JVMTI raw monitors entered in onload will transition into 599 // real raw monitor. VM is setup enough here for raw monitor enter. 600 JvmtiExport::transition_pending_onload_raw_monitors(); 601 602 // Create the VMThread 603 { TraceTime timer("Start VMThread", TRACETIME_LOG(Info, startuptime)); 604 605 VMThread::create(); 606 VMThread* vmthread = VMThread::vm_thread(); 607 608 if (!os::create_thread(vmthread, os::vm_thread)) { 609 vm_exit_during_initialization("Cannot create VM thread. " 610 "Out of system resources."); 611 } 612 613 // Wait for the VM thread to become ready, and VMThread::run to initialize 614 // Monitors can have spurious returns, must always check another state flag 615 { 616 MonitorLocker ml(Notify_lock); 617 os::start_thread(vmthread); 618 while (!vmthread->is_running()) { 619 ml.wait(); 620 } 621 } 622 } 623 624 assert(Universe::is_fully_initialized(), "not initialized"); 625 if (VerifyDuringStartup) { 626 // Make sure we're starting with a clean slate. 627 VM_Verify verify_op; 628 VMThread::execute(&verify_op); 629 } 630 631 // We need this to update the java.vm.info property in case any flags used 632 // to initially define it have been changed. This is needed for both CDS 633 // since UseSharedSpaces may be changed after java.vm.info 634 // is initially computed. See Abstract_VM_Version::vm_info_string(). 635 // This update must happen before we initialize the java classes, but 636 // after any initialization logic that might modify the flags. 637 Arguments::update_vm_info_property(VM_Version::vm_info_string()); 638 639 JavaThread* THREAD = JavaThread::current(); // For exception macros. 640 HandleMark hm(THREAD); 641 642 // Always call even when there are not JVMTI environments yet, since environments 643 // may be attached late and JVMTI must track phases of VM execution 644 JvmtiExport::enter_early_start_phase(); 645 646 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. 647 JvmtiExport::post_early_vm_start(); 648 649 // Launch -Xrun agents early if EagerXrunInit is set 650 if (EagerXrunInit) { 651 JvmtiAgentList::load_xrun_agents(); 652 } 653 654 initialize_java_lang_classes(main_thread, CHECK_JNI_ERR); 655 656 quicken_jni_functions(); 657 658 // No more stub generation allowed after that point. 659 StubCodeDesc::freeze(); 660 661 // Set flag that basic initialization has completed. Used by exceptions and various 662 // debug stuff, that does not work until all basic classes have been initialized. 663 set_init_completed(); 664 665 LogConfiguration::post_initialize(); 666 Metaspace::post_initialize(); 667 MutexLockerImpl::post_initialize(); 668 669 HOTSPOT_VM_INIT_END(); 670 671 // record VM initialization completion time 672 #if INCLUDE_MANAGEMENT 673 Management::record_vm_init_completed(); 674 #endif // INCLUDE_MANAGEMENT 675 676 log_info(os)("Initialized VM with process ID %d", os::current_process_id()); 677 678 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && CreateCoredumpOnCrash) { 679 char buffer[2*JVM_MAXPATHLEN]; 680 os::check_core_dump_prerequisites(buffer, sizeof(buffer), true); 681 } 682 683 // Signal Dispatcher needs to be started before VMInit event is posted 684 os::initialize_jdk_signal_support(CHECK_JNI_ERR); 685 686 // Start Attach Listener if +StartAttachListener or it can't be started lazily 687 if (!DisableAttachMechanism) { 688 AttachListener::vm_start(); 689 if (StartAttachListener || AttachListener::init_at_startup()) { 690 AttachListener::init(); 691 } 692 } 693 694 // Launch -Xrun agents if EagerXrunInit is not set. 695 if (!EagerXrunInit) { 696 JvmtiAgentList::load_xrun_agents(); 697 } 698 699 Arena::start_chunk_pool_cleaner_task(); 700 701 // Start the service thread 702 // The service thread enqueues JVMTI deferred events and does various hashtable 703 // and other cleanups. Needs to start before the compilers start posting events. 704 ServiceThread::initialize(); 705 706 // Start the monitor deflation thread: 707 MonitorDeflationThread::initialize(); 708 709 // initialize compiler(s) 710 #if defined(COMPILER1) || COMPILER2_OR_JVMCI 711 bool init_compilation = true; 712 #if INCLUDE_JVMCI 713 bool force_JVMCI_initialization = false; 714 if (EnableJVMCI) { 715 // Initialize JVMCI eagerly when it is explicitly requested. 716 // Or when JVMCILibDumpJNIConfig or JVMCIPrintProperties is enabled. 717 force_JVMCI_initialization = EagerJVMCI || JVMCIPrintProperties || JVMCILibDumpJNIConfig; 718 if (!force_JVMCI_initialization && UseJVMCICompiler && !UseJVMCINativeLibrary && (!UseInterpreter || !BackgroundCompilation)) { 719 // Force initialization of jarjvmci otherwise requests for blocking 720 // compilations will not actually block until jarjvmci is initialized. 721 force_JVMCI_initialization = true; 722 } 723 if (JVMCIPrintProperties || JVMCILibDumpJNIConfig) { 724 // Both JVMCILibDumpJNIConfig and JVMCIPrintProperties exit the VM 725 // so compilation should be disabled. This prevents dumping or 726 // printing from happening more than once. 727 init_compilation = false; 728 } 729 } 730 #endif 731 if (init_compilation) { 732 CompileBroker::compilation_init(CHECK_JNI_ERR); 733 } 734 #endif 735 736 // Start string deduplication thread if requested. 737 if (StringDedup::is_enabled()) { 738 StringDedup::start(); 739 } 740 741 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading. 742 // It is done after compilers are initialized, because otherwise compilations of 743 // signature polymorphic MH intrinsics can be missed 744 // (see SystemDictionary::find_method_handle_intrinsic). 745 initialize_jsr292_core_classes(CHECK_JNI_ERR); 746 747 // This will initialize the module system. Only java.base classes can be 748 // loaded until phase 2 completes 749 call_initPhase2(CHECK_JNI_ERR); 750 751 JFR_ONLY(Jfr::on_create_vm_2();) 752 753 // Always call even when there are not JVMTI environments yet, since environments 754 // may be attached late and JVMTI must track phases of VM execution 755 JvmtiExport::enter_start_phase(); 756 757 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. 758 JvmtiExport::post_vm_start(); 759 760 // Final system initialization including security manager and system class loader 761 call_initPhase3(CHECK_JNI_ERR); 762 763 // cache the system and platform class loaders 764 SystemDictionary::compute_java_loaders(CHECK_JNI_ERR); 765 766 if (Continuations::enabled()) { 767 // Initialize Continuation class now so that failure to create enterSpecial/doYield 768 // special nmethods due to limited CodeCache size can be treated as a fatal error at 769 // startup with the proper message that CodeCache size is too small. 770 initialize_class(vmSymbols::jdk_internal_vm_Continuation(), CHECK_JNI_ERR); 771 } 772 773 #if INCLUDE_CDS 774 // capture the module path info from the ModuleEntryTable 775 ClassLoader::initialize_module_path(THREAD); 776 if (HAS_PENDING_EXCEPTION) { 777 java_lang_Throwable::print(PENDING_EXCEPTION, tty); 778 vm_exit_during_initialization("ClassLoader::initialize_module_path() failed unexpectedly"); 779 } 780 #endif 781 782 #if INCLUDE_JVMCI 783 if (force_JVMCI_initialization) { 784 JVMCI::initialize_compiler(CHECK_JNI_ERR); 785 } 786 #endif 787 788 if (NativeHeapTrimmer::enabled()) { 789 NativeHeapTrimmer::initialize(); 790 } 791 792 // Always call even when there are not JVMTI environments yet, since environments 793 // may be attached late and JVMTI must track phases of VM execution 794 JvmtiExport::enter_live_phase(); 795 796 // Make perfmemory accessible 797 PerfMemory::set_accessible(true); 798 799 // Notify JVMTI agents that VM initialization is complete - nop if no agents. 800 JvmtiExport::post_vm_initialized(); 801 802 JFR_ONLY(Jfr::on_create_vm_3();) 803 804 #if INCLUDE_MANAGEMENT 805 Management::initialize(THREAD); 806 807 if (HAS_PENDING_EXCEPTION) { 808 // management agent fails to start possibly due to 809 // configuration problem and is responsible for printing 810 // stack trace if appropriate. Simply exit VM. 811 vm_exit(1); 812 } 813 #endif // INCLUDE_MANAGEMENT 814 815 StatSampler::engage(); 816 if (CheckJNICalls) JniPeriodicChecker::engage(); 817 818 call_postVMInitHook(THREAD); 819 // The Java side of PostVMInitHook.run must deal with all 820 // exceptions and provide means of diagnosis. 821 if (HAS_PENDING_EXCEPTION) { 822 CLEAR_PENDING_EXCEPTION; 823 } 824 825 // Let WatcherThread run all registered periodic tasks now. 826 // NOTE: All PeriodicTasks should be registered by now. If they 827 // aren't, late joiners might appear to start slowly (we might 828 // take a while to process their first tick). 829 WatcherThread::run_all_tasks(); 830 831 create_vm_timer.end(); 832 #ifdef ASSERT 833 _vm_complete = true; 834 #endif 835 836 if (CDSConfig::is_dumping_static_archive()) { 837 MetaspaceShared::preload_and_dump(CHECK_JNI_ERR); 838 } 839 840 if (log_is_enabled(Info, perf, class, link)) { 841 LogStreamHandle(Info, perf, class, link) log; 842 log.print_cr("At VM initialization completion:"); 843 ClassLoader::print_counters(&log); 844 } 845 846 return JNI_OK; 847 } 848 849 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when 850 // the program falls off the end of main(). Another VM exit path is through 851 // vm_exit(), when the program calls System.exit() to return a value, or when 852 // there is a serious error in VM. 853 // These two separate shutdown paths are not exactly the same, but they share 854 // Shutdown.shutdown() at Java level and before_exit() and VM_Exit op at VM level. 855 // 856 // Shutdown sequence: 857 // + Shutdown native memory tracking if it is on 858 // + Wait until we are the last non-daemon thread to execute 859 // <-- every thing is still working at this moment --> 860 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level 861 // shutdown hooks 862 // + Call before_exit(), prepare for VM exit 863 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), 864 // currently the only user of this mechanism is File.deleteOnExit()) 865 // > stop StatSampler, watcher thread, 866 // post thread end and vm death events to JVMTI, 867 // stop signal thread 868 // + Call JavaThread::exit(), it will: 869 // > release JNI handle blocks, remove stack guard pages 870 // > remove this thread from Threads list 871 // <-- no more Java code from this thread after this point --> 872 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop 873 // the compiler threads at safepoint 874 // <-- do not use anything that could get blocked by Safepoint --> 875 // + Disable tracing at JNI/JVM barriers 876 // + Set _vm_exited flag for threads that are still running native code 877 // + Call exit_globals() 878 // > deletes tty 879 // > deletes PerfMemory resources 880 // + Delete this thread 881 // + Return to caller 882 883 void Threads::destroy_vm() { 884 JavaThread* thread = JavaThread::current(); 885 886 #ifdef ASSERT 887 _vm_complete = false; 888 #endif 889 // Wait until we are the last non-daemon thread to execute, or 890 // if we are a daemon then wait until the last non-daemon thread has 891 // executed. 892 bool daemon = java_lang_Thread::is_daemon(thread->threadObj()); 893 int expected = daemon ? 0 : 1; 894 { 895 MonitorLocker nu(Threads_lock); 896 while (Threads::number_of_non_daemon_threads() > expected) 897 // This wait should make safepoint checks, wait without a timeout. 898 nu.wait(0); 899 } 900 901 EventShutdown e; 902 if (e.should_commit()) { 903 e.set_reason("No remaining non-daemon Java threads"); 904 e.commit(); 905 } 906 907 // Hang forever on exit if we are reporting an error. 908 if (ShowMessageBoxOnError && VMError::is_error_reported()) { 909 os::infinite_sleep(); 910 } 911 os::wait_for_keypress_at_exit(); 912 913 // run Java level shutdown hooks 914 thread->invoke_shutdown_hooks(); 915 916 before_exit(thread); 917 918 thread->exit(true); 919 920 // We are no longer on the main thread list but could still be in a 921 // secondary list where another thread may try to interact with us. 922 // So wait until all such interactions are complete before we bring 923 // the VM to the termination safepoint. Normally this would be done 924 // using thread->smr_delete() below where we delete the thread, but 925 // we can't call that after the termination safepoint is active as 926 // we will deadlock on the Threads_lock. Once all interactions are 927 // complete it is safe to directly delete the thread at any time. 928 ThreadsSMRSupport::wait_until_not_protected(thread); 929 930 // Stop VM thread. 931 { 932 // 4945125 The vm thread comes to a safepoint during exit. 933 // GC vm_operations can get caught at the safepoint, and the 934 // heap is unparseable if they are caught. Grab the Heap_lock 935 // to prevent this. The GC vm_operations will not be able to 936 // queue until after the vm thread is dead. After this point, 937 // we'll never emerge out of the safepoint before the VM exits. 938 // Assert that the thread is terminated so that acquiring the 939 // Heap_lock doesn't cause the terminated thread to participate in 940 // the safepoint protocol. 941 942 assert(thread->is_terminated(), "must be terminated here"); 943 MutexLocker ml(Heap_lock); 944 945 VMThread::wait_for_vm_thread_exit(); 946 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); 947 VMThread::destroy(); 948 } 949 950 // Now, all Java threads are gone except daemon threads. Daemon threads 951 // running Java code or in VM are stopped by the Safepoint. However, 952 // daemon threads executing native code are still running. But they 953 // will be stopped at native=>Java/VM barriers. Note that we can't 954 // simply kill or suspend them, as it is inherently deadlock-prone. 955 956 VM_Exit::set_vm_exited(); 957 958 // Clean up ideal graph printers after the VMThread has started 959 // the final safepoint which will block all the Compiler threads. 960 // Note that this Thread has already logically exited so the 961 // clean_up() function's use of a JavaThreadIteratorWithHandle 962 // would be a problem except set_vm_exited() has remembered the 963 // shutdown thread which is granted a policy exception. 964 #if defined(COMPILER2) && !defined(PRODUCT) 965 IdealGraphPrinter::clean_up(); 966 #endif 967 968 notify_vm_shutdown(); 969 970 // exit_globals() will delete tty 971 exit_globals(); 972 973 // Deleting the shutdown thread here is safe. See comment on 974 // wait_until_not_protected() above. 975 delete thread; 976 977 #if INCLUDE_JVMCI 978 if (JVMCICounterSize > 0) { 979 FREE_C_HEAP_ARRAY(jlong, JavaThread::_jvmci_old_thread_counters); 980 } 981 #endif 982 983 LogConfiguration::finalize(); 984 } 985 986 987 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { 988 if (version == JNI_VERSION_1_1) return JNI_TRUE; 989 return is_supported_jni_version(version); 990 } 991 992 993 jboolean Threads::is_supported_jni_version(jint version) { 994 if (version == JNI_VERSION_1_2) return JNI_TRUE; 995 if (version == JNI_VERSION_1_4) return JNI_TRUE; 996 if (version == JNI_VERSION_1_6) return JNI_TRUE; 997 if (version == JNI_VERSION_1_8) return JNI_TRUE; 998 if (version == JNI_VERSION_9) return JNI_TRUE; 999 if (version == JNI_VERSION_10) return JNI_TRUE; 1000 if (version == JNI_VERSION_19) return JNI_TRUE; 1001 if (version == JNI_VERSION_20) return JNI_TRUE; 1002 if (version == JNI_VERSION_21) return JNI_TRUE; 1003 if (version == JNI_VERSION_24) return JNI_TRUE; 1004 return JNI_FALSE; 1005 } 1006 1007 void Threads::add(JavaThread* p, bool force_daemon) { 1008 // The threads lock must be owned at this point 1009 assert(Threads_lock->owned_by_self(), "must have threads lock"); 1010 1011 BarrierSet::barrier_set()->on_thread_attach(p); 1012 1013 // Once a JavaThread is added to the Threads list, smr_delete() has 1014 // to be used to delete it. Otherwise we can just delete it directly. 1015 p->set_on_thread_list(); 1016 1017 _number_of_threads++; 1018 oop threadObj = p->threadObj(); 1019 bool daemon = true; 1020 // Bootstrapping problem: threadObj can be null for initial 1021 // JavaThread (or for threads attached via JNI) 1022 if (!force_daemon && 1023 (threadObj == nullptr || !java_lang_Thread::is_daemon(threadObj))) { 1024 _number_of_non_daemon_threads++; 1025 daemon = false; 1026 } 1027 1028 ThreadService::add_thread(p, daemon); 1029 1030 // Maintain fast thread list 1031 ThreadsSMRSupport::add_thread(p); 1032 1033 // Increase the ObjectMonitor ceiling for the new thread. 1034 ObjectSynchronizer::inc_in_use_list_ceiling(); 1035 1036 // Possible GC point. 1037 Events::log(Thread::current(), "Thread added: " INTPTR_FORMAT, p2i(p)); 1038 1039 // Make new thread known to active EscapeBarrier 1040 EscapeBarrier::thread_added(p); 1041 } 1042 1043 void Threads::remove(JavaThread* p, bool is_daemon) { 1044 // Extra scope needed for Thread_lock, so we can check 1045 // that we do not remove thread without safepoint code notice 1046 { 1047 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock); 1048 MonitorLocker ml(Threads_lock); 1049 1050 if (ThreadIdTable::is_initialized()) { 1051 // This cleanup must be done before the current thread's GC barrier 1052 // is detached since we need to touch the threadObj oop. 1053 jlong tid = SharedRuntime::get_java_tid(p); 1054 ThreadIdTable::remove_thread(tid); 1055 } 1056 1057 // BarrierSet state must be destroyed after the last thread transition 1058 // before the thread terminates. Thread transitions result in calls to 1059 // StackWatermarkSet::on_safepoint(), which performs GC processing, 1060 // requiring the GC state to be alive. 1061 BarrierSet::barrier_set()->on_thread_detach(p); 1062 if (p->is_exiting()) { 1063 // If we got here via JavaThread::exit(), then we remember that the 1064 // thread's GC barrier has been detached. We don't do this when we get 1065 // here from another path, e.g., cleanup_failed_attach_current_thread(). 1066 p->set_terminated(JavaThread::_thread_gc_barrier_detached); 1067 } 1068 1069 assert(ThreadsSMRSupport::get_java_thread_list()->includes(p), "p must be present"); 1070 1071 // Maintain fast thread list 1072 ThreadsSMRSupport::remove_thread(p); 1073 1074 _number_of_threads--; 1075 if (!is_daemon) { 1076 _number_of_non_daemon_threads--; 1077 1078 // If this is the last non-daemon thread then we need to do 1079 // a notify on the Threads_lock so a thread waiting 1080 // on destroy_vm will wake up. But that thread could be a daemon 1081 // or non-daemon, so we notify for both the 0 and 1 case. 1082 if (number_of_non_daemon_threads() <= 1) { 1083 ml.notify_all(); 1084 } 1085 } 1086 ThreadService::remove_thread(p, is_daemon); 1087 1088 // Make sure that safepoint code disregard this thread. This is needed since 1089 // the thread might mess around with locks after this point. This can cause it 1090 // to do callbacks into the safepoint code. However, the safepoint code is not aware 1091 // of this thread since it is removed from the queue. 1092 p->set_terminated(JavaThread::_thread_terminated); 1093 1094 // Notify threads waiting in EscapeBarriers 1095 EscapeBarrier::thread_removed(p); 1096 } // unlock Threads_lock and ThreadsLockThrottle_lock 1097 1098 // Reduce the ObjectMonitor ceiling for the exiting thread. 1099 ObjectSynchronizer::dec_in_use_list_ceiling(); 1100 1101 // Since Events::log uses a lock, we grab it outside the Threads_lock 1102 Events::log(Thread::current(), "Thread exited: " INTPTR_FORMAT, p2i(p)); 1103 } 1104 1105 // Operations on the Threads list for GC. These are not explicitly locked, 1106 // but the garbage collector must provide a safe context for them to run. 1107 // In particular, these things should never be called when the Threads_lock 1108 // is held by some other thread. (Note: the Safepoint abstraction also 1109 // uses the Threads_lock to guarantee this property. It also makes sure that 1110 // all threads gets blocked when exiting or starting). 1111 1112 void Threads::oops_do(OopClosure* f, NMethodClosure* cf) { 1113 ALL_JAVA_THREADS(p) { 1114 p->oops_do(f, cf); 1115 } 1116 VMThread::vm_thread()->oops_do(f, cf); 1117 } 1118 1119 void Threads::change_thread_claim_token() { 1120 if (++_thread_claim_token == 0) { 1121 // On overflow of the token counter, there is a risk of future 1122 // collisions between a new global token value and a stale token 1123 // for a thread, because not all iterations visit all threads. 1124 // (Though it's pretty much a theoretical concern for non-trivial 1125 // token counter sizes.) To deal with the possibility, reset all 1126 // the thread tokens to zero on global token overflow. 1127 struct ResetClaims : public ThreadClosure { 1128 virtual void do_thread(Thread* t) { 1129 t->claim_threads_do(false, 0); 1130 } 1131 } reset_claims; 1132 Threads::threads_do(&reset_claims); 1133 // On overflow, update the global token to non-zero, to 1134 // avoid the special "never claimed" initial thread value. 1135 _thread_claim_token = 1; 1136 } 1137 } 1138 1139 #ifdef ASSERT 1140 static void assert_thread_claimed(const char* kind, Thread* t, uintx expected) { 1141 const uintx token = t->threads_do_token(); 1142 assert(token == expected, 1143 "%s " PTR_FORMAT " has incorrect value " UINTX_FORMAT " != " 1144 UINTX_FORMAT, kind, p2i(t), token, expected); 1145 } 1146 1147 void Threads::assert_all_threads_claimed() { 1148 ALL_JAVA_THREADS(p) { 1149 assert_thread_claimed("JavaThread", p, _thread_claim_token); 1150 } 1151 1152 struct NJTClaimedVerifierClosure : public ThreadClosure { 1153 uintx _thread_claim_token; 1154 1155 NJTClaimedVerifierClosure(uintx thread_claim_token) : ThreadClosure(), _thread_claim_token(thread_claim_token) { } 1156 1157 virtual void do_thread(Thread* thread) override { 1158 assert_thread_claimed("Non-JavaThread", VMThread::vm_thread(), _thread_claim_token); 1159 } 1160 } tc(_thread_claim_token); 1161 1162 non_java_threads_do(&tc); 1163 } 1164 #endif // ASSERT 1165 1166 class ParallelOopsDoThreadClosure : public ThreadClosure { 1167 private: 1168 OopClosure* _f; 1169 NMethodClosure* _cf; 1170 public: 1171 ParallelOopsDoThreadClosure(OopClosure* f, NMethodClosure* cf) : _f(f), _cf(cf) {} 1172 void do_thread(Thread* t) { 1173 t->oops_do(_f, _cf); 1174 } 1175 }; 1176 1177 void Threads::possibly_parallel_oops_do(bool is_par, OopClosure* f, NMethodClosure* cf) { 1178 ParallelOopsDoThreadClosure tc(f, cf); 1179 possibly_parallel_threads_do(is_par, &tc); 1180 } 1181 1182 void Threads::metadata_do(MetadataClosure* f) { 1183 ALL_JAVA_THREADS(p) { 1184 p->metadata_do(f); 1185 } 1186 } 1187 1188 class ThreadHandlesClosure : public ThreadClosure { 1189 void (*_f)(Metadata*); 1190 public: 1191 ThreadHandlesClosure(void f(Metadata*)) : _f(f) {} 1192 virtual void do_thread(Thread* thread) { 1193 thread->metadata_handles_do(_f); 1194 } 1195 }; 1196 1197 void Threads::metadata_handles_do(void f(Metadata*)) { 1198 // Only walk the Handles in Thread. 1199 ThreadHandlesClosure handles_closure(f); 1200 threads_do(&handles_closure); 1201 } 1202 1203 #if INCLUDE_JVMTI 1204 // Get Java threads that are waiting to enter or re-enter the specified monitor. 1205 // Java threads that are executing mounted virtual threads are not included. 1206 GrowableArray<JavaThread*>* Threads::get_pending_threads(ThreadsList * t_list, 1207 int count, 1208 address monitor) { 1209 assert(Thread::current()->is_VM_thread(), "Must be the VM thread"); 1210 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); 1211 1212 int i = 0; 1213 for (JavaThread* p : *t_list) { 1214 if (!p->can_call_java()) continue; 1215 1216 oop thread_oop = JvmtiEnvBase::get_vthread_or_thread_oop(p); 1217 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) { 1218 continue; 1219 } 1220 // The first stage of async deflation does not affect any field 1221 // used by this comparison so the ObjectMonitor* is usable here. 1222 address pending = (address)p->current_pending_monitor(); 1223 address waiting = (address)p->current_waiting_monitor(); 1224 // do not include virtual threads to the list 1225 jint state = JvmtiEnvBase::get_thread_state(thread_oop, p); 1226 if (pending == monitor || (waiting == monitor && 1227 (state & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER)) 1228 ) { // found a match 1229 if (i < count) result->append(p); // save the first count matches 1230 i++; 1231 } 1232 } 1233 1234 return result; 1235 } 1236 #endif // INCLUDE_JVMTI 1237 1238 JavaThread *Threads::owning_thread_from_stacklock(ThreadsList * t_list, address basicLock) { 1239 assert(LockingMode == LM_LEGACY, "Not with new lightweight locking"); 1240 1241 JavaThread* the_owner = nullptr; 1242 for (JavaThread* q : *t_list) { 1243 if (q->is_lock_owned(basicLock)) { 1244 the_owner = q; 1245 break; 1246 } 1247 } 1248 return the_owner; 1249 } 1250 1251 JavaThread* Threads::owning_thread_from_object(ThreadsList * t_list, oop obj) { 1252 assert(LockingMode == LM_LIGHTWEIGHT, "Only with new lightweight locking"); 1253 for (JavaThread* q : *t_list) { 1254 // Need to start processing before accessing oops in the thread. 1255 StackWatermark* watermark = StackWatermarkSet::get(q, StackWatermarkKind::gc); 1256 if (watermark != nullptr) { 1257 watermark->start_processing(); 1258 } 1259 1260 if (q->lock_stack().contains(obj)) { 1261 return q; 1262 } 1263 } 1264 return nullptr; 1265 } 1266 1267 JavaThread* Threads::owning_thread_from_monitor(ThreadsList* t_list, ObjectMonitor* monitor) { 1268 if (monitor->is_owner_anonymous()) { 1269 if (LockingMode == LM_LIGHTWEIGHT) { 1270 return owning_thread_from_object(t_list, monitor->object()); 1271 } else { 1272 assert(LockingMode == LM_LEGACY, "invariant"); 1273 return owning_thread_from_stacklock(t_list, (address)monitor->stack_locker()); 1274 } 1275 } else { 1276 JavaThread* the_owner = nullptr; 1277 for (JavaThread* q : *t_list) { 1278 if (monitor->is_owner(q)) { 1279 the_owner = q; 1280 break; 1281 } 1282 } 1283 return the_owner; 1284 } 1285 } 1286 1287 class PrintOnClosure : public ThreadClosure { 1288 private: 1289 outputStream* _st; 1290 1291 public: 1292 PrintOnClosure(outputStream* st) : 1293 _st(st) {} 1294 1295 virtual void do_thread(Thread* thread) { 1296 if (thread != nullptr) { 1297 thread->print_on(_st); 1298 _st->cr(); 1299 } 1300 } 1301 }; 1302 1303 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. 1304 void Threads::print_on(outputStream* st, bool print_stacks, 1305 bool internal_format, bool print_concurrent_locks, 1306 bool print_extended_info) { 1307 char buf[32]; 1308 st->print_raw_cr(os::local_time_string(buf, sizeof(buf))); 1309 1310 st->print_cr("Full thread dump %s (%s %s):", 1311 VM_Version::vm_name(), 1312 VM_Version::vm_release(), 1313 VM_Version::vm_info_string()); 1314 st->cr(); 1315 1316 #if INCLUDE_SERVICES 1317 // Dump concurrent locks 1318 ConcurrentLocksDump concurrent_locks; 1319 if (print_concurrent_locks) { 1320 concurrent_locks.dump_at_safepoint(); 1321 } 1322 #endif // INCLUDE_SERVICES 1323 1324 ThreadsSMRSupport::print_info_on(st); 1325 st->cr(); 1326 1327 ALL_JAVA_THREADS(p) { 1328 ResourceMark rm; 1329 p->print_on(st, print_extended_info); 1330 if (print_stacks) { 1331 if (internal_format) { 1332 p->trace_stack(); 1333 } else { 1334 p->print_stack_on(st); 1335 if (p->is_vthread_mounted()) { 1336 // _lock_id is the thread ID of the mounted virtual thread 1337 st->print_cr(" Mounted virtual thread #" INT64_FORMAT, p->lock_id()); 1338 p->print_vthread_stack_on(st); 1339 } 1340 } 1341 } 1342 st->cr(); 1343 #if INCLUDE_SERVICES 1344 if (print_concurrent_locks) { 1345 concurrent_locks.print_locks_on(p, st); 1346 } 1347 #endif // INCLUDE_SERVICES 1348 } 1349 1350 PrintOnClosure cl(st); 1351 non_java_threads_do(&cl); 1352 1353 st->flush(); 1354 } 1355 1356 void Threads::print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf, 1357 int buflen, bool* found_current) { 1358 if (this_thread != nullptr) { 1359 bool is_current = (current == this_thread); 1360 *found_current = *found_current || is_current; 1361 st->print("%s", is_current ? "=>" : " "); 1362 1363 st->print(PTR_FORMAT, p2i(this_thread)); 1364 st->print(" "); 1365 this_thread->print_on_error(st, buf, buflen); 1366 st->cr(); 1367 } 1368 } 1369 1370 class PrintOnErrorClosure : public ThreadClosure { 1371 outputStream* _st; 1372 Thread* _current; 1373 char* _buf; 1374 int _buflen; 1375 bool* _found_current; 1376 unsigned _num_printed; 1377 public: 1378 PrintOnErrorClosure(outputStream* st, Thread* current, char* buf, 1379 int buflen, bool* found_current) : 1380 _st(st), _current(current), _buf(buf), _buflen(buflen), _found_current(found_current), 1381 _num_printed(0) {} 1382 1383 virtual void do_thread(Thread* thread) { 1384 _num_printed++; 1385 Threads::print_on_error(thread, _st, _current, _buf, _buflen, _found_current); 1386 } 1387 1388 unsigned num_printed() const { return _num_printed; } 1389 }; 1390 1391 // Threads::print_on_error() is called by fatal error handler. It's possible 1392 // that VM is not at safepoint and/or current thread is inside signal handler. 1393 // Don't print stack trace, as the stack may not be walkable. Don't allocate 1394 // memory (even in resource area), it might deadlock the error handler. 1395 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, 1396 int buflen) { 1397 ThreadsSMRSupport::print_info_on(st); 1398 st->cr(); 1399 1400 bool found_current = false; 1401 st->print_cr("Java Threads: ( => current thread )"); 1402 unsigned num_java = 0; 1403 ALL_JAVA_THREADS(thread) { 1404 print_on_error(thread, st, current, buf, buflen, &found_current); 1405 num_java++; 1406 } 1407 st->print_cr("Total: %u", num_java); 1408 st->cr(); 1409 1410 st->print_cr("Other Threads:"); 1411 unsigned num_other = ((VMThread::vm_thread() != nullptr) ? 1 : 0) + 1412 ((WatcherThread::watcher_thread() != nullptr) ? 1 : 0) + 1413 ((AsyncLogWriter::instance() != nullptr) ? 1 : 0); 1414 print_on_error(VMThread::vm_thread(), st, current, buf, buflen, &found_current); 1415 print_on_error(WatcherThread::watcher_thread(), st, current, buf, buflen, &found_current); 1416 print_on_error(AsyncLogWriter::instance(), st, current, buf, buflen, &found_current); 1417 1418 if (Universe::heap() != nullptr) { 1419 PrintOnErrorClosure print_closure(st, current, buf, buflen, &found_current); 1420 Universe::heap()->gc_threads_do(&print_closure); 1421 num_other += print_closure.num_printed(); 1422 } 1423 1424 if (!found_current) { 1425 st->cr(); 1426 st->print("=>" PTR_FORMAT " (exited) ", p2i(current)); 1427 current->print_on_error(st, buf, buflen); 1428 num_other++; 1429 st->cr(); 1430 } 1431 st->print_cr("Total: %u", num_other); 1432 st->cr(); 1433 1434 st->print_cr("Threads with active compile tasks:"); 1435 unsigned num = print_threads_compiling(st, buf, buflen); 1436 st->print_cr("Total: %u", num); 1437 } 1438 1439 unsigned Threads::print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form) { 1440 unsigned num = 0; 1441 ALL_JAVA_THREADS(thread) { 1442 if (thread->is_Compiler_thread()) { 1443 CompilerThread* ct = (CompilerThread*) thread; 1444 1445 // Keep task in local variable for null check. 1446 // ct->_task might be set to null by concurring compiler thread 1447 // because it completed the compilation. The task is never freed, 1448 // though, just returned to a free list. 1449 CompileTask* task = ct->task(); 1450 if (task != nullptr) { 1451 thread->print_name_on_error(st, buf, buflen); 1452 st->print(" "); 1453 task->print(st, nullptr, short_form, true); 1454 num++; 1455 } 1456 } 1457 } 1458 return num; 1459 } 1460 1461 void Threads::verify() { 1462 ALL_JAVA_THREADS(p) { 1463 p->verify(); 1464 } 1465 VMThread* thread = VMThread::vm_thread(); 1466 if (thread != nullptr) thread->verify(); 1467 }