1 /*
2 * Copyright (c) 1997, 2026, 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 "cds/aotLinkedClassBulkLoader.hpp"
27 #include "cds/aotMetaspace.hpp"
28 #include "cds/cds_globals.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/heapShared.inline.hpp"
31 #include "classfile/classLoader.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/javaThreadStatus.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmClasses.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/compilerThread.hpp"
40 #include "compiler/compileTask.hpp"
41 #include "gc/shared/barrierSet.hpp"
42 #include "gc/shared/barrierSetNMethod.hpp"
43 #include "gc/shared/gcVMOperations.hpp"
44 #include "gc/shared/oopStorage.hpp"
45 #include "gc/shared/oopStorageSet.hpp"
46 #include "gc/shared/stringdedup/stringDedup.hpp"
47 #include "jfr/jfrEvents.hpp"
48 #include "jvm.h"
49 #include "jvmtifiles/jvmtiEnv.hpp"
50 #include "logging/log.hpp"
51 #include "logging/logAsyncWriter.hpp"
52 #include "logging/logConfiguration.hpp"
53 #include "memory/allocation.inline.hpp"
54 #include "memory/iterator.hpp"
55 #include "memory/oopFactory.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "nmt/memTracker.hpp"
59 #include "oops/instanceKlass.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "prims/jvm_misc.hpp"
64 #include "prims/jvmtiAgentList.hpp"
65 #include "prims/jvmtiEnvBase.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/fieldDescriptor.inline.hpp"
68 #include "runtime/flags/jvmFlagLimit.hpp"
69 #include "runtime/globals.hpp"
70 #include "runtime/globals_extension.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/interfaceSupport.inline.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaCalls.hpp"
75 #include "runtime/javaThread.inline.hpp"
76 #include "runtime/jniHandles.inline.hpp"
77 #include "runtime/jniPeriodicChecker.hpp"
78 #include "runtime/lockStack.inline.hpp"
79 #include "runtime/monitorDeflationThread.hpp"
80 #include "runtime/mutexLocker.hpp"
81 #include "runtime/nonJavaThread.hpp"
82 #include "runtime/objectMonitor.inline.hpp"
83 #include "runtime/osThread.hpp"
84 #include "runtime/perfData.hpp"
85 #include "runtime/safepoint.hpp"
86 #include "runtime/safepointMechanism.inline.hpp"
87 #include "runtime/safepointVerifiers.hpp"
88 #include "runtime/serviceThread.hpp"
89 #include "runtime/sharedRuntime.hpp"
90 #include "runtime/stackWatermarkSet.inline.hpp"
91 #include "runtime/stubCodeGenerator.hpp"
92 #include "runtime/thread.inline.hpp"
93 #include "runtime/threads.hpp"
94 #include "runtime/threadSMR.inline.hpp"
95 #include "runtime/timer.hpp"
96 #include "runtime/timerTrace.hpp"
97 #include "runtime/trimNativeHeap.hpp"
98 #include "runtime/vm_version.hpp"
99 #include "runtime/vmOperations.hpp"
100 #include "sanitizers/address.hpp"
101 #include "services/attachListener.hpp"
102 #include "services/management.hpp"
103 #include "services/threadIdTable.hpp"
104 #include "services/threadService.hpp"
105 #include "utilities/debug.hpp"
106 #include "utilities/dtrace.hpp"
107 #include "utilities/events.hpp"
108 #include "utilities/macros.hpp"
109 #include "utilities/vmError.hpp"
110 #ifdef COMPILER2
111 #include "opto/idealGraphPrinter.hpp"
112 #include "runtime/hotCodeCollector.hpp"
113 #endif
114 #if INCLUDE_JFR
115 #include "jfr/jfr.hpp"
116 #endif
117
118 // Initialization after module runtime initialization
119 void universe_post_module_init(); // must happen after call_initPhase2
120
121
122 static void initialize_class(Symbol* class_name, TRAPS) {
123 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK);
124 InstanceKlass::cast(klass)->initialize(CHECK);
125 }
126
127
128 // Creates the initial ThreadGroup
129 static Handle create_initial_thread_group(TRAPS) {
130 Handle system_instance = JavaCalls::construct_new_instance(
131 vmClasses::ThreadGroup_klass(),
132 vmSymbols::void_method_signature(),
133 CHECK_NH);
134 Universe::set_system_thread_group(system_instance());
135
136 Handle string = java_lang_String::create_from_str("main", CHECK_NH);
137 Handle main_instance = JavaCalls::construct_new_instance(
138 vmClasses::ThreadGroup_klass(),
139 vmSymbols::threadgroup_string_void_signature(),
140 system_instance,
141 string,
142 CHECK_NH);
143 return main_instance;
144 }
145
146 // Creates the initial Thread, and sets it to running.
147 static void create_initial_thread(Handle thread_group, JavaThread* thread,
148 TRAPS) {
149 InstanceKlass* ik = vmClasses::Thread_klass();
150 assert(ik->is_initialized(), "must be");
151 instanceHandle thread_oop = ik->allocate_instance_handle(CHECK);
152
153 // Cannot use JavaCalls::construct_new_instance because the java.lang.Thread
154 // constructor calls Thread.current(), which must be set here for the
155 // initial thread.
156 java_lang_Thread::set_thread(thread_oop(), thread);
157 thread->set_threadOopHandles(thread_oop());
158
159 Handle string = java_lang_String::create_from_str("main", CHECK);
160
161 JavaValue result(T_VOID);
162 JavaCalls::call_special(&result, thread_oop,
163 ik,
164 vmSymbols::object_initializer_name(),
165 vmSymbols::threadgroup_string_void_signature(),
166 thread_group,
167 string,
168 CHECK);
169
170 DEBUG_ONLY(int64_t main_thread_tid = java_lang_Thread::thread_id(thread_oop());)
171 assert(main_thread_tid == ThreadIdentifier::initial(), "");
172 assert(main_thread_tid == thread->monitor_owner_id(), "");
173 JFR_ONLY(assert(JFR_JVM_THREAD_ID(thread) == static_cast<traceid>(main_thread_tid), "initial tid mismatch");)
174
175 // Set thread status to running since main thread has
176 // been started and running.
177 java_lang_Thread::set_thread_status(thread_oop(),
178 JavaThreadStatus::RUNNABLE);
179 }
180
181 // Extract version and vendor specific information from
182 // java.lang.VersionProps fields.
183 // Returned char* is allocated in the thread's resource area
184 // so must be copied for permanency.
185 static const char* get_java_version_info(InstanceKlass* ik,
186 Symbol* field_name) {
187 fieldDescriptor fd;
188 bool found = ik != nullptr &&
189 ik->find_local_field(field_name,
190 vmSymbols::string_signature(), &fd);
191 if (found) {
192 oop name_oop = ik->java_mirror()->obj_field(fd.offset());
193 if (name_oop == nullptr) {
194 return nullptr;
195 }
196 const char* name = java_lang_String::as_utf8_string(name_oop);
197 return name;
198 } else {
199 return nullptr;
200 }
201 }
202
203 // ======= Threads ========
204
205 // The Threads class links together all active threads, and provides
206 // operations over all threads. It is protected by the Threads_lock,
207 // which is also used in other global contexts like safepointing.
208 // ThreadsListHandles are used to safely perform operations on one
209 // or more threads without the risk of the thread exiting during the
210 // operation.
211 //
212 // Note: The Threads_lock is currently more widely used than we
213 // would like. We are actively migrating Threads_lock uses to other
214 // mechanisms in order to reduce Threads_lock contention.
215
216 int Threads::_number_of_threads = 0;
217 int Threads::_number_of_non_daemon_threads = 0;
218 int Threads::_return_code = 0;
219 uintx Threads::_thread_claim_token = 1; // Never zero.
220
221 #ifdef ASSERT
222 bool Threads::_vm_complete = false;
223 #endif
224
225 // General purpose hook into Java code, run once when the VM is initialized.
226 // The Java library method itself may be changed independently from the VM.
227 static void call_postVMInitHook(TRAPS) {
228 Klass* klass = SystemDictionary::resolve_or_null(vmSymbols::jdk_internal_vm_PostVMInitHook(), THREAD);
229 if (klass != nullptr) {
230 JavaValue result(T_VOID);
231 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(),
232 vmSymbols::void_method_signature(),
233 CHECK);
234 }
235 }
236
237 // All NonJavaThreads (i.e., every non-JavaThread in the system).
238 void Threads::non_java_threads_do(ThreadClosure* tc) {
239 NoSafepointVerifier nsv;
240 for (NonJavaThread::Iterator njti; !njti.end(); njti.step()) {
241 tc->do_thread(njti.current());
242 }
243 }
244
245 // All JavaThreads
246 #define ALL_JAVA_THREADS(X) \
247 for (JavaThread* X : *ThreadsSMRSupport::get_java_thread_list())
248
249 // All JavaThreads
250 void Threads::java_threads_do(ThreadClosure* tc) {
251 assert_locked_or_safepoint(Threads_lock);
252 // ALL_JAVA_THREADS iterates through all JavaThreads.
253 ALL_JAVA_THREADS(p) {
254 tc->do_thread(p);
255 }
256 }
257
258 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system).
259 void Threads::threads_do(ThreadClosure* tc) {
260 assert_locked_or_safepoint(Threads_lock);
261 java_threads_do(tc);
262 non_java_threads_do(tc);
263 }
264
265 void Threads::possibly_parallel_threads_do(bool is_par, ThreadClosure* tc) {
266 assert_at_safepoint();
267
268 uintx claim_token = Threads::thread_claim_token();
269 ALL_JAVA_THREADS(p) {
270 if (p->claim_threads_do(is_par, claim_token)) {
271 tc->do_thread(p);
272 }
273 }
274 for (NonJavaThread::Iterator njti; !njti.end(); njti.step()) {
275 Thread* current = njti.current();
276 if (current->claim_threads_do(is_par, claim_token)) {
277 tc->do_thread(current);
278 }
279 }
280 }
281
282 // The system initialization in the library has three phases.
283 //
284 // Phase 1: java.lang.System class initialization
285 // java.lang.System is a primordial class loaded and initialized
286 // by the VM early during startup. java.lang.System.<clinit>
287 // only does registerNatives and keeps the rest of the class
288 // initialization work later until thread initialization completes.
289 //
290 // System.initPhase1 initializes the system properties, the static
291 // fields in, out, and err. Set up java signal handlers, OS-specific
292 // system settings, and thread group of the main thread.
293 static void call_initPhase1(TRAPS) {
294 Klass* klass = vmClasses::System_klass();
295 JavaValue result(T_VOID);
296 JavaCalls::call_static(&result, klass, vmSymbols::initPhase1_name(),
297 vmSymbols::void_method_signature(), CHECK);
298 }
299
300 // Phase 2. Module system initialization
301 // This will initialize the module system. Only java.base classes
302 // can be loaded until phase 2 completes.
303 //
304 // Call System.initPhase2 after the compiler initialization and jsr292
305 // classes get initialized because module initialization runs a lot of java
306 // code, that for performance reasons, should be compiled. Also, this will
307 // enable the startup code to use lambda and other language features in this
308 // phase and onward.
309 //
310 // After phase 2, The VM will begin search classes from -Xbootclasspath/a.
311 static void call_initPhase2(TRAPS) {
312 TraceTime timer("Initialize module system", TRACETIME_LOG(Info, startuptime));
313
314 Klass* klass = vmClasses::System_klass();
315
316 JavaValue result(T_INT);
317 JavaCallArguments args;
318 args.push_int(DisplayVMOutputToStderr);
319 args.push_int(log_is_enabled(Debug, init)); // print stack trace if exception thrown
320 JavaCalls::call_static(&result, klass, vmSymbols::initPhase2_name(),
321 vmSymbols::boolean_boolean_int_signature(), &args, CHECK);
322 if (result.get_jint() != JNI_OK) {
323 vm_exit_during_initialization(); // no message or exception
324 }
325
326 universe_post_module_init();
327 }
328
329 // Phase 3. final setup - set security manager, system class loader and TCCL
330 //
331 // This will instantiate and set the security manager, set the system class
332 // loader as well as the thread context class loader. The security manager
333 // and system class loader may be a custom class loaded from -Xbootclasspath/a,
334 // other modules or the application's classpath.
335 static void call_initPhase3(TRAPS) {
336 Klass* klass = vmClasses::System_klass();
337 JavaValue result(T_VOID);
338 JavaCalls::call_static(&result, klass, vmSymbols::initPhase3_name(),
339 vmSymbols::void_method_signature(), CHECK);
340 }
341
342 void Threads::initialize_java_lang_classes(JavaThread* main_thread, TRAPS) {
343 TraceTime timer("Initialize java.lang classes", TRACETIME_LOG(Info, startuptime));
344
345 // This is before the execution of the very first Java bytecode.
346 if (CDSConfig::is_using_aot_linked_classes()) {
347 AOTLinkedClassBulkLoader::link_classes(THREAD);
348 }
349
350 initialize_class(vmSymbols::java_lang_String(), CHECK);
351
352 // Inject CompactStrings value after the static initializers for String ran.
353 java_lang_String::set_compact_strings(CompactStrings);
354
355 // Initialize java_lang.System (needed before creating the thread)
356 initialize_class(vmSymbols::java_lang_System(), CHECK);
357 // The VM creates & returns objects of this class. Make sure it's initialized.
358 initialize_class(vmSymbols::java_lang_Class(), CHECK);
359
360 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK);
361 Handle thread_group = create_initial_thread_group(CHECK);
362 Universe::set_main_thread_group(thread_group());
363 initialize_class(vmSymbols::java_lang_Thread(), CHECK);
364 create_initial_thread(thread_group, main_thread, CHECK);
365
366 HeapShared::init_box_classes(CHECK);
367
368 // The VM creates objects of this class.
369 initialize_class(vmSymbols::java_lang_Module(), CHECK);
370
371 #ifdef ASSERT
372 InstanceKlass *k = vmClasses::UnsafeConstants_klass();
373 assert(k->is_not_initialized(), "UnsafeConstants should not already be initialized");
374 #endif
375
376 // initialize the hardware-specific constants needed by Unsafe
377 initialize_class(vmSymbols::jdk_internal_misc_UnsafeConstants(), CHECK);
378 jdk_internal_misc_UnsafeConstants::set_unsafe_constants();
379
380 // The VM preresolves methods to these classes. Make sure that they get initialized
381 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK);
382 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK);
383
384 HeapShared::materialize_thread_object();
385
386 // Phase 1 of the system initialization in the library, java.lang.System class initialization
387 call_initPhase1(CHECK);
388
389 // Get the Java runtime name, version, and vendor info after java.lang.System is initialized.
390 // Some values are actually configure-time constants but some can be set via the jlink tool and
391 // so must be read dynamically. We treat them all the same.
392 InstanceKlass* ik = SystemDictionary::find_instance_klass(THREAD, vmSymbols::java_lang_VersionProps(),
393 Handle());
394 {
395 ResourceMark rm(main_thread);
396 JDK_Version::set_java_version(get_java_version_info(ik, vmSymbols::java_version_name()));
397
398 JDK_Version::set_runtime_name(get_java_version_info(ik, vmSymbols::java_runtime_name_name()));
399
400 JDK_Version::set_runtime_version(get_java_version_info(ik, vmSymbols::java_runtime_version_name()));
401
402 JDK_Version::set_runtime_vendor_version(get_java_version_info(ik, vmSymbols::java_runtime_vendor_version_name()));
403
404 JDK_Version::set_runtime_vendor_vm_bug_url(get_java_version_info(ik, vmSymbols::java_runtime_vendor_vm_bug_url_name()));
405 }
406
407 // an instance of OutOfMemory exception has been allocated earlier
408 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK);
409 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK);
410 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK);
411 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK);
412 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK);
413 initialize_class(vmSymbols::jdk_internal_vm_PreemptedException(), CHECK);
414 initialize_class(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), CHECK);
415 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK);
416 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK);
417 initialize_class(vmSymbols::java_lang_IdentityException(), CHECK);
418 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK);
419 initialize_class(vmSymbols::java_lang_InternalError(), CHECK);
420 }
421
422 void Threads::initialize_jsr292_core_classes(TRAPS) {
423 TraceTime timer("Initialize java.lang.invoke classes", TRACETIME_LOG(Info, startuptime));
424
425 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK);
426 initialize_class(vmSymbols::java_lang_invoke_ResolvedMethodName(), CHECK);
427 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK);
428 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK);
429
430 if (UseSharedSpaces) {
431 HeapShared::initialize_java_lang_invoke(CHECK);
432 }
433 }
434
435 // One-shot PeriodicTask subclass for reading the release file
436 class ReadReleaseFileTask : public PeriodicTask {
437 public:
438 ReadReleaseFileTask() : PeriodicTask(100) {}
439
440 virtual void task() {
441 os::read_image_release_file();
442
443 // Reclaim our storage and disenroll ourself.
444 delete this;
445 }
446 };
447
448 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
449 extern void JDK_Version_init();
450
451 // Preinitialize version info.
452 VM_Version::early_initialize();
453
454 // Check version
455 if (!is_supported_jni_version(args->version)) return JNI_EVERSION;
456
457 // Deferred "static" initialization
458 NonJavaThread::init();
459
460 // Initialize library-based TLS
461 ThreadLocalStorage::init();
462
463 // Initialize the output stream module
464 ostream_init();
465
466 // Process java launcher properties.
467 Arguments::process_sun_java_launcher_properties(args);
468
469 // Initialize the os module
470 os::init();
471
472 // Initialize memory pools
473 Arena::initialize_chunk_pool();
474
475 MACOS_AARCH64_ONLY(os::current_thread_enable_wx(WXWrite));
476
477 // Record VM creation timing statistics
478 TraceVmCreationTime create_vm_timer;
479 create_vm_timer.start();
480
481 // Initialize system properties.
482 Arguments::init_system_properties();
483
484 // So that JDK version can be used as a discriminator when parsing arguments
485 JDK_Version_init();
486
487 // Update/Initialize System properties after JDK version number is known
488 Arguments::init_version_specific_system_properties();
489
490 // Make sure to initialize log configuration *before* parsing arguments
491 LogConfiguration::initialize(create_vm_timer.begin_time());
492
493 // Parse arguments
494 // Note: this internally calls os::init_container_support()
495 jint parse_result = Arguments::parse(args);
496 if (parse_result != JNI_OK) return parse_result;
497
498 // Initialize NMT right after argument parsing to keep the pre-NMT-init window small.
499 MemTracker::initialize();
500
501 os::init_before_ergo();
502
503 jint ergo_result = Arguments::apply_ergo();
504 if (ergo_result != JNI_OK) return ergo_result;
505
506 // Final check of all ranges after ergonomics which may change values.
507 if (!JVMFlagLimit::check_all_ranges()) {
508 return JNI_EINVAL;
509 }
510
511 // Final check of all 'AfterErgo' constraints after ergonomics which may change values.
512 bool constraint_result = JVMFlagLimit::check_all_constraints(JVMFlagConstraintPhase::AfterErgo);
513 if (!constraint_result) {
514 return JNI_EINVAL;
515 }
516
517 if (PauseAtStartup) {
518 os::pause();
519 }
520
521 HOTSPOT_VM_INIT_BEGIN();
522
523 // Timing (must come after argument parsing)
524 TraceTime timer("Create VM", TRACETIME_LOG(Info, startuptime));
525
526 // Initialize the os module after parsing the args
527 jint os_init_2_result = os::init_2();
528 if (os_init_2_result != JNI_OK) return os_init_2_result;
529
530 #ifdef CAN_SHOW_REGISTERS_ON_ASSERT
531 // Initialize assert poison page mechanism.
532 if (ShowRegistersOnAssert) {
533 initialize_assert_poison();
534 }
535 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
536
537 SafepointMechanism::initialize();
538
539 jint adjust_after_os_result = Arguments::adjust_after_os();
540 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result;
541
542 // Initialize output stream logging
543 ostream_init_log();
544
545 // Launch -agentlib/-agentpath and converted -Xrun agents
546 JvmtiAgentList::load_agents();
547
548 // Initialize Threads state
549 _number_of_threads = 0;
550 _number_of_non_daemon_threads = 0;
551
552 // Initialize global data structures and create system classes in heap
553 vm_init_globals();
554
555 // Initialize OopStorage for threadObj
556 JavaThread::_thread_oop_storage = OopStorageSet::create_strong("Thread OopStorage", mtThread);
557
558 // Attach the main thread to this os thread. It is added to the threads list inside
559 // universe_init(), within init_globals().
560 JavaThread* main_thread = new JavaThread();
561 main_thread->set_thread_state(_thread_in_vm);
562 main_thread->initialize_thread_current();
563 // Once mutexes and main_thread are ready, we can use NmtVirtualMemoryLocker.
564 MemTracker::NmtVirtualMemoryLocker::set_safe_to_use();
565 // must do this before set_active_handles
566 main_thread->record_stack_base_and_size();
567 main_thread->register_thread_stack_with_NMT();
568 main_thread->set_active_handles(JNIHandleBlock::allocate_block());
569 MACOS_AARCH64_ONLY(main_thread->init_wx());
570
571 // Set the _monitor_owner_id now since we will run Java code before the Thread instance
572 // is even created. The same value will be assigned to the Thread instance on init.
573 const int64_t main_thread_tid = ThreadIdentifier::next();
574 guarantee(main_thread_tid == 3, "Must equal the PRIMORDIAL_TID used in Threads.java");
575 main_thread->set_monitor_owner_id(main_thread_tid);
576
577 if (!Thread::set_as_starting_thread(main_thread)) {
578 vm_shutdown_during_initialization(
579 "Failed necessary internal allocation. Out of swap space");
580 main_thread->smr_delete();
581 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
582 return JNI_ENOMEM;
583 }
584
585 JFR_ONLY(Jfr::initialize_main_thread(main_thread);)
586
587 // Enable guard page *after* os::create_main_thread(), otherwise it would
588 // crash Linux VM, see notes in os_linux.cpp.
589 main_thread->stack_overflow_state()->create_stack_guard_pages();
590
591 // Initialize Java-Level synchronization subsystem
592 ObjectMonitor::Initialize();
593 ObjectSynchronizer::initialize();
594
595 // Initialize global modules
596 jint status = init_globals();
597 if (status != JNI_OK) {
598 main_thread->smr_delete();
599 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
600 return status;
601 }
602
603 // Have the WatcherThread read the release file in the background.
604 ReadReleaseFileTask* read_task = new ReadReleaseFileTask();
605 read_task->enroll();
606
607 // Create WatcherThread as soon as we can since we need it in case
608 // of hangs during error reporting.
609 WatcherThread::start();
610
611 status = init_globals2();
612 if (status != JNI_OK) {
613 Threads::remove(main_thread, false);
614 // It is possible that we managed to fully initialize Universe but have then
615 // failed by throwing an exception. In that case our caller JNI_CreateJavaVM
616 // will want to report it, so we can't delete the main thread.
617 if (!main_thread->has_pending_exception()) {
618 main_thread->smr_delete();
619 }
620 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
621 return status;
622 }
623
624 ObjectMonitor::Initialize2();
625
626 JFR_ONLY(Jfr::on_create_vm_1();)
627
628 // Should be done after the heap is fully created
629 main_thread->cache_global_variables();
630
631 // Any JVMTI raw monitors entered in onload will transition into
632 // real raw monitor. VM is setup enough here for raw monitor enter.
633 JvmtiExport::transition_pending_onload_raw_monitors();
634
635 // Create the VMThread
636 { TraceTime timer("Start VMThread", TRACETIME_LOG(Info, startuptime));
637
638 VMThread::create();
639 VMThread* vmthread = VMThread::vm_thread();
640
641 if (!os::create_thread(vmthread, os::vm_thread)) {
642 vm_exit_during_initialization("Cannot create VM thread. "
643 "Out of system resources.");
644 }
645
646 // Wait for the VM thread to become ready, and VMThread::run to initialize
647 // Monitors can have spurious returns, must always check another state flag
648 {
649 MonitorLocker ml(Notify_lock);
650 os::start_thread(vmthread);
651 while (!vmthread->is_running()) {
652 ml.wait();
653 }
654 }
655 }
656
657 assert(Universe::is_fully_initialized(), "not initialized");
658 if (VerifyDuringStartup) {
659 // Make sure we're starting with a clean slate.
660 VM_Verify verify_op;
661 VMThread::execute(&verify_op);
662 }
663
664 // We need this to update the java.vm.info property in case any flags used
665 // to initially define it have been changed. This is needed for both CDS
666 // since UseSharedSpaces may be changed after java.vm.info
667 // is initially computed. See Abstract_VM_Version::vm_info_string().
668 // This update must happen before we initialize the java classes, but
669 // after any initialization logic that might modify the flags.
670 Arguments::update_vm_info_property(VM_Version::vm_info_string());
671
672 JavaThread* THREAD = JavaThread::current(); // For exception macros.
673 HandleMark hm(THREAD);
674
675 // Always call even when there are not JVMTI environments yet, since environments
676 // may be attached late and JVMTI must track phases of VM execution
677 JvmtiExport::enter_early_start_phase();
678
679 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
680 JvmtiExport::post_early_vm_start();
681
682 // Launch -Xrun agents early if EagerXrunInit is set
683 if (EagerXrunInit) {
684 JvmtiAgentList::load_xrun_agents();
685 }
686
687 initialize_java_lang_classes(main_thread, CHECK_JNI_ERR);
688
689 quicken_jni_functions();
690
691 // No more stub generation allowed after that point.
692 StubCodeDesc::freeze();
693
694 // Prepare AOT heap loader for GC.
695 HeapShared::enable_gc();
696
697 #ifdef ADDRESS_SANITIZER
698 Asan::initialize();
699 #endif
700
701 // Set flag that basic initialization has completed. Used by exceptions and various
702 // debug stuff, that does not work until all basic classes have been initialized.
703 set_init_completed();
704
705 LogConfiguration::post_initialize();
706 Metaspace::post_initialize();
707 MutexLockerImpl::post_initialize();
708
709 HOTSPOT_VM_INIT_END();
710
711 // record VM initialization completion time
712 #if INCLUDE_MANAGEMENT
713 Management::record_vm_init_completed();
714 #endif // INCLUDE_MANAGEMENT
715
716 log_info(os)("Initialized VM with process ID %d", os::current_process_id());
717
718 if (!FLAG_IS_DEFAULT(CreateCoredumpOnCrash) && CreateCoredumpOnCrash) {
719 char buffer[2*JVM_MAXPATHLEN];
720 os::check_core_dump_prerequisites(buffer, sizeof(buffer), true);
721 }
722
723 // Signal Dispatcher needs to be started before VMInit event is posted
724 os::initialize_jdk_signal_support(CHECK_JNI_ERR);
725
726 // Start Attach Listener if +StartAttachListener or it can't be started lazily
727 if (!DisableAttachMechanism) {
728 AttachListener::vm_start();
729 if (StartAttachListener || AttachListener::init_at_startup()) {
730 AttachListener::init();
731 }
732 }
733
734 // Launch -Xrun agents if EagerXrunInit is not set.
735 if (!EagerXrunInit) {
736 JvmtiAgentList::load_xrun_agents();
737 }
738
739 Arena::start_chunk_pool_cleaner_task();
740
741 // Start the service thread
742 // The service thread enqueues JVMTI deferred events and does various hashtable
743 // and other cleanups. Needs to start before the compilers start posting events.
744 ServiceThread::initialize();
745
746 if (CDSConfig::is_using_aot_linked_classes()) {
747 nmethod::post_delayed_compiled_method_load_events();
748 }
749
750 // Start the monitor deflation thread:
751 MonitorDeflationThread::initialize();
752
753 // initialize compiler(s)
754 #if COMPILER1_OR_COMPILER2
755 CompileBroker::compilation_init(CHECK_JNI_ERR);
756 #endif // COMPILER1_OR_COMPILER2
757
758 if (CDSConfig::is_using_aot_linked_classes()) {
759 SystemDictionary::restore_archived_method_handle_intrinsics();
760 AOTLinkedClassBulkLoader::init_javabase_classes(THREAD);
761 }
762
763 // Start string deduplication thread if requested.
764 if (StringDedup::is_enabled()) {
765 StringDedup::start();
766 }
767
768 #ifdef COMPILER2
769 if (HotCodeHeap) {
770 HotCodeCollector::initialize();
771 }
772 #endif // COMPILER2
773
774 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading.
775 // It is done after compilers are initialized, because otherwise compilations of
776 // signature polymorphic MH intrinsics can be missed
777 // (see SystemDictionary::find_method_handle_intrinsic).
778 initialize_jsr292_core_classes(CHECK_JNI_ERR);
779
780 // This will initialize the module system. Only java.base classes can be
781 // loaded until phase 2 completes
782 call_initPhase2(CHECK_JNI_ERR);
783
784 if (CDSConfig::is_using_aot_linked_classes()) {
785 AOTLinkedClassBulkLoader::init_non_javabase_classes(THREAD);
786 }
787 #ifndef PRODUCT
788 HeapShared::initialize_test_class_from_archive(THREAD);
789 #endif
790
791 JFR_ONLY(Jfr::on_create_vm_2();)
792
793 // Always call even when there are not JVMTI environments yet, since environments
794 // may be attached late and JVMTI must track phases of VM execution
795 JvmtiExport::enter_start_phase();
796
797 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
798 JvmtiExport::post_vm_start();
799
800 // Final system initialization including security manager and system class loader
801 call_initPhase3(CHECK_JNI_ERR);
802
803 // cache the system and platform class loaders
804 SystemDictionary::compute_java_loaders(CHECK_JNI_ERR);
805
806 // Initiate replay training processing once preloading is over.
807 CompileBroker::init_training_replay();
808
809 AOTLinkedClassBulkLoader::replay_training_at_init_for_preloaded_classes(CHECK_JNI_ERR);
810
811 if (Continuations::enabled()) {
812 // Initialize Continuation class now so that failure to create enterSpecial/doYield
813 // special nmethods due to limited CodeCache size can be treated as a fatal error at
814 // startup with the proper message that CodeCache size is too small.
815 initialize_class(vmSymbols::jdk_internal_vm_Continuation(), CHECK_JNI_ERR);
816 }
817
818 if (NativeHeapTrimmer::enabled()) {
819 NativeHeapTrimmer::initialize();
820 }
821
822 // Always call even when there are not JVMTI environments yet, since environments
823 // may be attached late and JVMTI must track phases of VM execution
824 JvmtiExport::enter_live_phase();
825
826 // Make perfmemory accessible
827 PerfMemory::set_accessible(true);
828
829 // Notify JVMTI agents that VM initialization is complete - nop if no agents.
830 JvmtiExport::post_vm_initialized();
831
832 JFR_ONLY(Jfr::on_create_vm_3();)
833
834 #if INCLUDE_MANAGEMENT
835 bool start_agent = true;
836 #if INCLUDE_CDS
837 start_agent = !CDSConfig::is_dumping_final_static_archive();
838 if (!start_agent) {
839 log_info(aot)("Not starting management agent during creation of AOT cache.");
840 }
841 #endif // INCLUDE_CDS
842 if (start_agent) {
843 Management::initialize(THREAD);
844
845 if (HAS_PENDING_EXCEPTION) {
846 // management agent fails to start possibly due to
847 // configuration problem and is responsible for printing
848 // stack trace if appropriate. Simply exit VM.
849 vm_exit(1);
850 }
851 }
852 #endif // INCLUDE_MANAGEMENT
853
854 if (UsePerfData) PerfDataManager::create_misc_perfdata();
855 if (CheckJNICalls) JniPeriodicChecker::engage();
856
857 call_postVMInitHook(THREAD);
858 // The Java side of PostVMInitHook.run must deal with all
859 // exceptions and provide means of diagnosis.
860 if (HAS_PENDING_EXCEPTION) {
861 CLEAR_PENDING_EXCEPTION;
862 }
863
864 // Let WatcherThread run all registered periodic tasks now.
865 // NOTE: All PeriodicTasks should be registered by now. If they
866 // aren't, late joiners might appear to start slowly (we might
867 // take a while to process their first tick).
868 WatcherThread::run_all_tasks();
869
870 // Finish materializing AOT objects
871 HeapShared::finish_materialize_objects();
872
873 create_vm_timer.end();
874 #ifdef ASSERT
875 _vm_complete = true;
876 #endif
877
878 if (CDSConfig::is_dumping_classic_static_archive()) {
879 // Classic -Xshare:dump, aka "old workflow"
880 AOTMetaspace::dump_static_archive(CHECK_JNI_ERR);
881 } else if (CDSConfig::is_dumping_final_static_archive()) {
882 tty->print_cr("Reading AOTConfiguration %s and writing AOTCache %s", AOTConfiguration, AOTCache);
883 AOTMetaspace::dump_static_archive(CHECK_JNI_ERR);
884 }
885
886 if (log_is_enabled(Info, perf, class, link)) {
887 LogStreamHandle(Info, perf, class, link) log;
888 log.print_cr("At VM initialization completion:");
889 ClassLoader::print_counters(&log);
890 }
891
892 return JNI_OK;
893 }
894
895 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when
896 // the program falls off the end of main(). Another VM exit path is through
897 // vm_exit(), when the program calls System.exit() to return a value, or when
898 // there is a serious error in VM.
899 // These two separate shutdown paths are not exactly the same, but they share
900 // Shutdown.shutdown() at Java level and before_exit() and VM_Exit op at VM level.
901 //
902 // Shutdown sequence:
903 // + Shutdown native memory tracking if it is on
904 // + Wait until we are the last non-daemon thread to execute
905 // <-- every thing is still working at this moment -->
906 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level
907 // shutdown hooks
908 // + Call before_exit(), prepare for VM exit
909 // > run VM level shutdown hooks (they are registered through JVM_OnExit(),
910 // currently the only user of this mechanism is File.deleteOnExit())
911 // > stop watcher thread,
912 // post thread end and vm death events to JVMTI,
913 // stop signal thread
914 // + Call JavaThread::exit(), it will:
915 // > release JNI handle blocks, remove stack guard pages
916 // > remove this thread from Threads list
917 // <-- no more Java code from this thread after this point -->
918 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop
919 // the compiler threads at safepoint
920 // <-- do not use anything that could get blocked by Safepoint -->
921 // + Disable tracing at JNI/JVM barriers
922 // + Set _vm_exited flag for threads that are still running native code
923 // + Call exit_globals()
924 // > deletes tty
925 // > deletes PerfMemory resources
926 // + Delete this thread
927 // + Return to caller
928
929 void Threads::destroy_vm() {
930 JavaThread* thread = JavaThread::current();
931
932 #ifdef ASSERT
933 _vm_complete = false;
934 #endif
935 // Wait until we are the last non-daemon thread to execute, or
936 // if we are a daemon then wait until the last non-daemon thread has
937 // executed.
938 bool daemon = java_lang_Thread::is_daemon(thread->threadObj());
939 int expected = daemon ? 0 : 1;
940 {
941 MonitorLocker nu(Threads_lock);
942 while (Threads::number_of_non_daemon_threads() > expected)
943 // This wait should make safepoint checks, wait without a timeout.
944 nu.wait(0);
945 }
946
947 EventShutdown e;
948 if (e.should_commit()) {
949 e.set_reason("No remaining non-daemon Java threads");
950 e.commit();
951 }
952
953 // Hang forever on exit if we are reporting an error.
954 if (ShowMessageBoxOnError && VMError::is_error_reported()) {
955 os::infinite_sleep();
956 }
957 os::wait_for_keypress_at_exit();
958
959 // run Java level shutdown hooks
960 thread->invoke_shutdown_hooks();
961
962 before_exit(thread);
963
964 thread->exit(true);
965
966 // We are no longer on the main thread list but could still be in a
967 // secondary list where another thread may try to interact with us.
968 // So wait until all such interactions are complete before we bring
969 // the VM to the termination safepoint. Normally this would be done
970 // using thread->smr_delete() below where we delete the thread, but
971 // we can't call that after the termination safepoint is active as
972 // we will deadlock on the Threads_lock. Once all interactions are
973 // complete it is safe to directly delete the thread at any time.
974 ThreadsSMRSupport::wait_until_not_protected(thread);
975
976 // Stop VM thread.
977 {
978 // 4945125 The vm thread comes to a safepoint during exit.
979 // GC vm_operations can get caught at the safepoint, and the
980 // heap is unparseable if they are caught. Grab the Heap_lock
981 // to prevent this. The GC vm_operations will not be able to
982 // queue until after the vm thread is dead. After this point,
983 // we'll never emerge out of the safepoint before the VM exits.
984 // Assert that the thread is terminated so that acquiring the
985 // Heap_lock doesn't cause the terminated thread to participate in
986 // the safepoint protocol.
987
988 assert(thread->is_terminated(), "must be terminated here");
989 MutexLocker ml(Heap_lock);
990
991 VMThread::wait_for_vm_thread_exit();
992 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint");
993 VMThread::destroy();
994 }
995
996 // Now, all Java threads are gone except daemon threads. Daemon threads
997 // running Java code or in VM are stopped by the Safepoint. However,
998 // daemon threads executing native code are still running. But they
999 // will be stopped at native=>Java/VM barriers. Note that we can't
1000 // simply kill or suspend them, as it is inherently deadlock-prone.
1001
1002 VM_Exit::set_vm_exited();
1003
1004 // Clean up ideal graph printers after the VMThread has started
1005 // the final safepoint which will block all the Compiler threads.
1006 // Note that this Thread has already logically exited so the
1007 // clean_up() function's use of a JavaThreadIteratorWithHandle
1008 // would be a problem except set_vm_exited() has remembered the
1009 // shutdown thread which is granted a policy exception.
1010 #if defined(COMPILER2) && !defined(PRODUCT)
1011 IdealGraphPrinter::clean_up();
1012 #endif
1013
1014 notify_vm_shutdown();
1015
1016 // exit_globals() will delete tty
1017 exit_globals();
1018
1019 // Deleting the shutdown thread here is safe. See comment on
1020 // wait_until_not_protected() above.
1021 delete thread;
1022
1023 LogConfiguration::finalize();
1024 }
1025
1026
1027 jboolean Threads::is_supported_jni_version_including_1_1(jint version) {
1028 if (version == JNI_VERSION_1_1) return JNI_TRUE;
1029 return is_supported_jni_version(version);
1030 }
1031
1032
1033 jboolean Threads::is_supported_jni_version(jint version) {
1034 if (version == JNI_VERSION_1_2) return JNI_TRUE;
1035 if (version == JNI_VERSION_1_4) return JNI_TRUE;
1036 if (version == JNI_VERSION_1_6) return JNI_TRUE;
1037 if (version == JNI_VERSION_1_8) return JNI_TRUE;
1038 if (version == JNI_VERSION_9) return JNI_TRUE;
1039 if (version == JNI_VERSION_10) return JNI_TRUE;
1040 if (version == JNI_VERSION_19) return JNI_TRUE;
1041 if (version == JNI_VERSION_20) return JNI_TRUE;
1042 if (version == JNI_VERSION_21) return JNI_TRUE;
1043 if (version == JNI_VERSION_24) return JNI_TRUE;
1044 if (version == JNI_VERSION_28) return JNI_TRUE;
1045 return JNI_FALSE;
1046 }
1047
1048 void Threads::add(JavaThread* p, bool force_daemon) {
1049 // The threads lock must be owned at this point
1050 assert(Threads_lock->owned_by_self(), "must have threads lock");
1051 assert(p->monitor_owner_id() != 0, "should be set");
1052
1053 BarrierSet::barrier_set()->on_thread_attach(p);
1054
1055 // Once a JavaThread is added to the Threads list, smr_delete() has
1056 // to be used to delete it. Otherwise we can just delete it directly.
1057 p->set_on_thread_list();
1058
1059 _number_of_threads++;
1060 oop threadObj = p->threadObj();
1061 bool daemon = true;
1062 // Bootstrapping problem: threadObj can be null for initial
1063 // JavaThread (or for threads attached via JNI)
1064 if (!force_daemon &&
1065 (threadObj == nullptr || !java_lang_Thread::is_daemon(threadObj))) {
1066 _number_of_non_daemon_threads++;
1067 daemon = false;
1068 }
1069
1070 ThreadService::add_thread(p, daemon);
1071
1072 // Maintain fast thread list
1073 ThreadsSMRSupport::add_thread(p);
1074
1075 // Increase the ObjectMonitor ceiling for the new thread.
1076 ObjectSynchronizer::inc_in_use_list_ceiling();
1077
1078 // Possible GC point.
1079 Events::log(Thread::current(), "Thread added: " INTPTR_FORMAT, p2i(p));
1080
1081 // Make new thread known to active EscapeBarrier
1082 EscapeBarrier::thread_added(p);
1083 }
1084
1085 void Threads::remove(JavaThread* p, bool is_daemon) {
1086 // Extra scope needed for Thread_lock, so we can check
1087 // that we do not remove thread without safepoint code notice
1088 {
1089 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
1090 MonitorLocker ml(Threads_lock);
1091
1092 if (ThreadIdTable::is_initialized_acquire()) {
1093 // This cleanup must be done before the current thread's GC barrier
1094 // is detached since we need to touch the threadObj oop.
1095 jlong tid = SharedRuntime::get_java_tid(p);
1096 ThreadIdTable::remove_thread(tid);
1097 }
1098
1099 // BarrierSet state must be destroyed after the last thread transition
1100 // before the thread terminates. Thread transitions result in calls to
1101 // StackWatermarkSet::on_safepoint(), which performs GC processing,
1102 // requiring the GC state to be alive.
1103 BarrierSet::barrier_set()->on_thread_detach(p);
1104 if (p->is_exiting()) {
1105 // If we got here via JavaThread::exit(), then we remember that the
1106 // thread's GC barrier has been detached. We don't do this when we get
1107 // here from another path, e.g., cleanup_failed_attach_current_thread().
1108 p->set_terminated(JavaThread::_thread_gc_barrier_detached);
1109 }
1110
1111 assert(ThreadsSMRSupport::get_java_thread_list()->includes(p), "p must be present");
1112
1113 // Maintain fast thread list
1114 ThreadsSMRSupport::remove_thread(p);
1115
1116 _number_of_threads--;
1117 if (!is_daemon) {
1118 _number_of_non_daemon_threads--;
1119
1120 // If this is the last non-daemon thread then we need to do
1121 // a notify on the Threads_lock so a thread waiting
1122 // on destroy_vm will wake up. But that thread could be a daemon
1123 // or non-daemon, so we notify for both the 0 and 1 case.
1124 if (number_of_non_daemon_threads() <= 1) {
1125 ml.notify_all();
1126 }
1127 }
1128 ThreadService::remove_thread(p, is_daemon);
1129
1130 // Make sure that safepoint code disregard this thread. This is needed since
1131 // the thread might mess around with locks after this point. This can cause it
1132 // to do callbacks into the safepoint code. However, the safepoint code is not aware
1133 // of this thread since it is removed from the queue.
1134 p->set_terminated(JavaThread::_thread_terminated);
1135
1136 // Notify threads waiting in EscapeBarriers
1137 EscapeBarrier::thread_removed(p);
1138 } // unlock Threads_lock and ThreadsLockThrottle_lock
1139
1140 // Reduce the ObjectMonitor ceiling for the exiting thread.
1141 ObjectSynchronizer::dec_in_use_list_ceiling();
1142
1143 // Since Events::log uses a lock, we grab it outside the Threads_lock
1144 Events::log(Thread::current(), "Thread exited: " INTPTR_FORMAT, p2i(p));
1145 }
1146
1147 // Operations on the Threads list for GC. These are not explicitly locked,
1148 // but the garbage collector must provide a safe context for them to run.
1149 // In particular, these things should never be called when the Threads_lock
1150 // is held by some other thread. (Note: the Safepoint abstraction also
1151 // uses the Threads_lock to guarantee this property. It also makes sure that
1152 // all threads gets blocked when exiting or starting).
1153
1154 void Threads::oops_do(OopClosure* f, NMethodClosure* cf) {
1155 ALL_JAVA_THREADS(p) {
1156 p->oops_do(f, cf);
1157 }
1158 VMThread::vm_thread()->oops_do(f, cf);
1159 }
1160
1161 void Threads::change_thread_claim_token() {
1162 if (++_thread_claim_token == 0) {
1163 // On overflow of the token counter, there is a risk of future
1164 // collisions between a new global token value and a stale token
1165 // for a thread, because not all iterations visit all threads.
1166 // (Though it's pretty much a theoretical concern for non-trivial
1167 // token counter sizes.) To deal with the possibility, reset all
1168 // the thread tokens to zero on global token overflow.
1169 struct ResetClaims : public ThreadClosure {
1170 virtual void do_thread(Thread* t) {
1171 t->claim_threads_do(false, 0);
1172 }
1173 } reset_claims;
1174 Threads::threads_do(&reset_claims);
1175 // On overflow, update the global token to non-zero, to
1176 // avoid the special "never claimed" initial thread value.
1177 _thread_claim_token = 1;
1178 }
1179 }
1180
1181 #ifdef ASSERT
1182 static void assert_thread_claimed(const char* kind, Thread* t, uintx expected) {
1183 const uintx token = t->threads_do_token();
1184 assert(token == expected,
1185 "%s " PTR_FORMAT " has incorrect value %zu != %zu",
1186 kind, p2i(t), token, expected);
1187 }
1188
1189 void Threads::assert_all_threads_claimed() {
1190 ALL_JAVA_THREADS(p) {
1191 assert_thread_claimed("JavaThread", p, _thread_claim_token);
1192 }
1193
1194 struct NJTClaimedVerifierClosure : public ThreadClosure {
1195 uintx _thread_claim_token;
1196
1197 NJTClaimedVerifierClosure(uintx thread_claim_token) : ThreadClosure(), _thread_claim_token(thread_claim_token) { }
1198
1199 virtual void do_thread(Thread* thread) override {
1200 assert_thread_claimed("Non-JavaThread", VMThread::vm_thread(), _thread_claim_token);
1201 }
1202 } tc(_thread_claim_token);
1203
1204 non_java_threads_do(&tc);
1205 }
1206 #endif // ASSERT
1207
1208 class ParallelOopsDoThreadClosure : public ThreadClosure {
1209 private:
1210 OopClosure* _f;
1211 NMethodClosure* _cf;
1212 public:
1213 ParallelOopsDoThreadClosure(OopClosure* f, NMethodClosure* cf) : _f(f), _cf(cf) {}
1214 void do_thread(Thread* t) {
1215 t->oops_do(_f, _cf);
1216 }
1217 };
1218
1219 void Threads::possibly_parallel_oops_do(bool is_par, OopClosure* f, NMethodClosure* cf) {
1220 ParallelOopsDoThreadClosure tc(f, cf);
1221 possibly_parallel_threads_do(is_par, &tc);
1222 }
1223
1224 void Threads::metadata_do(MetadataClosure* f) {
1225 ALL_JAVA_THREADS(p) {
1226 p->metadata_do(f);
1227 }
1228 }
1229
1230 class ThreadHandlesClosure : public ThreadClosure {
1231 void (*_f)(Metadata*);
1232 public:
1233 ThreadHandlesClosure(void f(Metadata*)) : _f(f) {}
1234 virtual void do_thread(Thread* thread) {
1235 thread->metadata_handles_do(_f);
1236 }
1237 };
1238
1239 void Threads::metadata_handles_do(void f(Metadata*)) {
1240 // Only walk the Handles in Thread.
1241 ThreadHandlesClosure handles_closure(f);
1242 threads_do(&handles_closure);
1243 }
1244
1245 #if INCLUDE_JVMTI
1246 // Get Java threads that are waiting to enter or re-enter the specified monitor.
1247 // Java threads that are executing mounted virtual threads are not included.
1248 GrowableArray<JavaThread*>* Threads::get_pending_threads(ThreadsList * t_list,
1249 int count,
1250 address monitor) {
1251 assert(Thread::current()->is_VM_thread(), "Must be the VM thread");
1252 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count);
1253
1254 int i = 0;
1255 for (JavaThread* p : *t_list) {
1256 if (!p->can_call_java()) continue;
1257
1258 oop thread_oop = JvmtiEnvBase::get_vthread_or_thread_oop(p);
1259 if (thread_oop->is_a(vmClasses::BaseVirtualThread_klass())) {
1260 continue;
1261 }
1262 // The first stage of async deflation does not affect any field
1263 // used by this comparison so the ObjectMonitor* is usable here.
1264 address pending = (address)p->current_pending_monitor();
1265 address waiting = (address)p->current_waiting_monitor();
1266 // do not include virtual threads to the list
1267 jint state = JvmtiEnvBase::get_thread_state(thread_oop, p);
1268 if (pending == monitor || (waiting == monitor &&
1269 (state & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER))
1270 ) { // found a match
1271 if (i < count) result->append(p); // save the first count matches
1272 i++;
1273 }
1274 }
1275
1276 return result;
1277 }
1278 #endif // INCLUDE_JVMTI
1279
1280 JavaThread* Threads::owning_thread_from_object(ThreadsList * t_list, oop obj) {
1281 for (JavaThread* q : *t_list) {
1282 // Need to start processing before accessing oops in the thread.
1283 StackWatermark* watermark = StackWatermarkSet::get(q, StackWatermarkKind::gc);
1284 if (watermark != nullptr) {
1285 watermark->start_processing();
1286 }
1287
1288 if (q->lock_stack().contains(obj)) {
1289 return q;
1290 }
1291 }
1292 return nullptr;
1293 }
1294
1295 JavaThread* Threads::owning_thread_from_monitor(ThreadsList* t_list, ObjectMonitor* monitor) {
1296 if (monitor->has_anonymous_owner()) {
1297 return owning_thread_from_object(t_list, monitor->object());
1298 } else {
1299 JavaThread* the_owner = nullptr;
1300 for (JavaThread* q : *t_list) {
1301 if (monitor->has_owner(q)) {
1302 the_owner = q;
1303 break;
1304 }
1305 }
1306 return the_owner;
1307 }
1308 }
1309
1310 class PrintOnClosure : public ThreadClosure {
1311 private:
1312 outputStream* _st;
1313
1314 public:
1315 PrintOnClosure(outputStream* st) :
1316 _st(st) {}
1317
1318 virtual void do_thread(Thread* thread) {
1319 if (thread != nullptr) {
1320 thread->print_on(_st);
1321 _st->cr();
1322 }
1323 }
1324 };
1325
1326 // Threads::print_on() is called at safepoint by VM_PrintThreads operation.
1327 void Threads::print_on(outputStream* st, bool print_stacks,
1328 bool internal_format, bool print_concurrent_locks,
1329 bool print_extended_info) {
1330 char buf[32];
1331 st->print_raw_cr(os::local_time_string(buf, sizeof(buf)));
1332
1333 st->print_cr("Full thread dump %s (%s %s)",
1334 VM_Version::vm_name(),
1335 VM_Version::vm_release(),
1336 VM_Version::vm_info_string());
1337 JDK_Version::current().to_string(buf, sizeof(buf));
1338 const char* runtime_name = JDK_Version::runtime_name() != nullptr ?
1339 JDK_Version::runtime_name() : "";
1340 const char* runtime_version = JDK_Version::runtime_version() != nullptr ?
1341 JDK_Version::runtime_version() : "";
1342 const char* vendor_version = JDK_Version::runtime_vendor_version() != nullptr ?
1343 JDK_Version::runtime_vendor_version() : "";
1344 const char* jdk_debug_level = VM_Version::printable_jdk_debug_level() != nullptr ?
1345 VM_Version::printable_jdk_debug_level() : "";
1346
1347 st->print_cr(" JDK version: %s%s%s (%s) (%sbuild %s)", runtime_name,
1348 (*vendor_version != '\0') ? " " : "", vendor_version,
1349 buf, jdk_debug_level, runtime_version);
1350
1351 st->cr();
1352
1353 #if INCLUDE_SERVICES
1354 // Dump concurrent locks
1355 ConcurrentLocksDump concurrent_locks;
1356 if (print_concurrent_locks) {
1357 concurrent_locks.dump_at_safepoint();
1358 }
1359 #endif // INCLUDE_SERVICES
1360
1361 ThreadsSMRSupport::print_info_on(st);
1362 st->cr();
1363
1364 ALL_JAVA_THREADS(p) {
1365 ResourceMark rm;
1366 p->print_on(st, print_extended_info);
1367 if (print_stacks) {
1368 if (internal_format) {
1369 p->trace_stack();
1370 } else {
1371 p->print_stack_on(st);
1372 if (p->is_vthread_mounted()) {
1373 st->print_cr(" Mounted virtual thread #" INT64_FORMAT, java_lang_Thread::thread_id(p->vthread()));
1374 p->print_vthread_stack_on(st);
1375 }
1376 }
1377 }
1378 st->cr();
1379 #if INCLUDE_SERVICES
1380 if (print_concurrent_locks) {
1381 concurrent_locks.print_locks_on(p, st);
1382 }
1383 #endif // INCLUDE_SERVICES
1384 }
1385
1386 PrintOnClosure cl(st);
1387 non_java_threads_do(&cl);
1388
1389 st->flush();
1390 }
1391
1392 void Threads::print_on_error(Thread* this_thread, outputStream* st, Thread* current, char* buf,
1393 int buflen, bool* found_current) {
1394 if (this_thread != nullptr) {
1395 bool is_current = (current == this_thread);
1396 *found_current = *found_current || is_current;
1397 st->print("%s", is_current ? "=>" : " ");
1398
1399 st->print(PTR_FORMAT, p2i(this_thread));
1400 st->print(" ");
1401 this_thread->print_on_error(st, buf, buflen);
1402 st->cr();
1403 }
1404 }
1405
1406 class PrintOnErrorClosure : public ThreadClosure {
1407 outputStream* _st;
1408 Thread* _current;
1409 char* _buf;
1410 int _buflen;
1411 bool* _found_current;
1412 unsigned _num_printed;
1413 public:
1414 PrintOnErrorClosure(outputStream* st, Thread* current, char* buf,
1415 int buflen, bool* found_current) :
1416 _st(st), _current(current), _buf(buf), _buflen(buflen), _found_current(found_current),
1417 _num_printed(0) {}
1418
1419 virtual void do_thread(Thread* thread) {
1420 _num_printed++;
1421 Threads::print_on_error(thread, _st, _current, _buf, _buflen, _found_current);
1422 }
1423
1424 unsigned num_printed() const { return _num_printed; }
1425 };
1426
1427 // Threads::print_on_error() is called by fatal error handler. It's possible
1428 // that VM is not at safepoint and/or current thread is inside signal handler.
1429 // Don't print stack trace, as the stack may not be walkable. Don't allocate
1430 // memory (even in resource area), it might deadlock the error handler.
1431 void Threads::print_on_error(outputStream* st, Thread* current, char* buf,
1432 int buflen) {
1433 ThreadsSMRSupport::print_info_on(st);
1434 st->cr();
1435
1436 bool found_current = false;
1437 st->print_cr("Java Threads: ( => current thread )");
1438 unsigned num_java = 0;
1439 ALL_JAVA_THREADS(thread) {
1440 print_on_error(thread, st, current, buf, buflen, &found_current);
1441 num_java++;
1442 }
1443 st->print_cr("Total: %u", num_java);
1444 st->cr();
1445
1446 st->print_cr("Other Threads:");
1447 unsigned num_other = ((VMThread::vm_thread() != nullptr) ? 1 : 0) +
1448 ((WatcherThread::watcher_thread() != nullptr) ? 1 : 0) +
1449 ((AsyncLogWriter::instance() != nullptr) ? 1 : 0);
1450 print_on_error(VMThread::vm_thread(), st, current, buf, buflen, &found_current);
1451 print_on_error(WatcherThread::watcher_thread(), st, current, buf, buflen, &found_current);
1452 print_on_error(AsyncLogWriter::instance(), st, current, buf, buflen, &found_current);
1453
1454 if (Universe::heap() != nullptr) {
1455 PrintOnErrorClosure print_closure(st, current, buf, buflen, &found_current);
1456 Universe::heap()->gc_threads_do(&print_closure);
1457 num_other += print_closure.num_printed();
1458 }
1459
1460 if (!found_current) {
1461 st->cr();
1462 st->print("=>" PTR_FORMAT " (exited) ", p2i(current));
1463 current->print_on_error(st, buf, buflen);
1464 num_other++;
1465 st->cr();
1466 }
1467 st->print_cr("Total: %u", num_other);
1468 st->cr();
1469
1470 st->print_cr("Threads with active compile tasks:");
1471 unsigned num = print_threads_compiling(st, buf, buflen);
1472 st->print_cr("Total: %u", num);
1473 }
1474
1475 unsigned Threads::print_threads_compiling(outputStream* st, char* buf, int buflen, bool short_form) {
1476 unsigned num = 0;
1477 ALL_JAVA_THREADS(thread) {
1478 if (thread->is_Compiler_thread()) {
1479 CompilerThread* ct = (CompilerThread*) thread;
1480
1481 // Keep task in local variable for null check.
1482 // ct->_task might be set to null by concurring compiler thread
1483 // because it completed the compilation. The task is never freed,
1484 // though, just returned to a free list.
1485 CompileTask* task = ct->task();
1486 if (task != nullptr) {
1487 thread->print_name_on_error(st, buf, buflen);
1488 st->print(" ");
1489 task->print(st, nullptr, short_form, true);
1490 num++;
1491 }
1492 }
1493 }
1494 return num;
1495 }
1496
1497 void Threads::verify() {
1498 ALL_JAVA_THREADS(p) {
1499 p->verify();
1500 }
1501 VMThread* thread = VMThread::vm_thread();
1502 if (thread != nullptr) thread->verify();
1503 }