1 /*
  2  * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "cds/cds_globals.hpp"
 27 #include "cds/cdsConfig.hpp"
 28 #include "cds/classListWriter.hpp"
 29 #include "cds/classPreloader.hpp"
 30 #include "cds/dynamicArchive.hpp"
 31 #include "cds/methodProfiler.hpp"
 32 #include "cds/metaspaceShared.hpp"
 33 #include "classfile/classLoader.hpp"
 34 #include "classfile/classLoaderDataGraph.hpp"
 35 #include "classfile/javaClasses.hpp"
 36 #include "classfile/stringTable.hpp"
 37 #include "classfile/symbolTable.hpp"
 38 #include "classfile/systemDictionary.hpp"
 39 #include "code/codeCache.hpp"
 40 #include "code/SCCache.hpp"
 41 #include "compiler/compilationMemoryStatistic.hpp"
 42 #include "compiler/compilationPolicy.hpp"
 43 #include "compiler/compileBroker.hpp"
 44 #include "compiler/compilerOracle.hpp"
 45 #include "gc/shared/collectedHeap.hpp"
 46 #include "gc/shared/stringdedup/stringDedup.hpp"
 47 #include "interpreter/bytecodeHistogram.hpp"
 48 #include "interpreter/interpreterRuntime.hpp"
 49 #include "jfr/jfrEvents.hpp"
 50 #include "jfr/support/jfrThreadId.hpp"
 51 #include "jvm.h"
 52 #include "logging/log.hpp"
 53 #include "logging/logStream.hpp"
 54 #include "memory/metaspaceUtils.hpp"
 55 #include "memory/oopFactory.hpp"
 56 #include "memory/resourceArea.hpp"
 57 #include "memory/universe.hpp"
 58 #include "nmt/memMapPrinter.hpp"
 59 #include "nmt/memTracker.hpp"
 60 #include "oops/constantPool.hpp"
 61 #include "oops/generateOopMap.hpp"
 62 #include "oops/instanceKlass.hpp"
 63 #include "oops/instanceOop.hpp"
 64 #include "oops/klassVtable.hpp"
 65 #include "oops/method.hpp"
 66 #include "oops/objArrayOop.hpp"
 67 #include "oops/oop.inline.hpp"
 68 #include "oops/symbol.hpp"
 69 #include "oops/trainingData.hpp"
 70 #include "prims/jvmtiAgentList.hpp"
 71 #include "prims/jvmtiExport.hpp"
 72 #include "prims/methodHandles.hpp"
 73 #include "runtime/continuation.hpp"
 74 #include "runtime/deoptimization.hpp"
 75 #include "runtime/flags/flagSetting.hpp"
 76 #include "runtime/globals_extension.hpp"
 77 #include "runtime/handles.inline.hpp"
 78 #include "runtime/init.hpp"
 79 #include "runtime/interfaceSupport.inline.hpp"
 80 #include "runtime/java.hpp"
 81 #include "runtime/javaThread.hpp"
 82 #include "runtime/sharedRuntime.hpp"
 83 #include "runtime/statSampler.hpp"
 84 #include "runtime/stubRoutines.hpp"
 85 #include "runtime/task.hpp"
 86 #include "runtime/threads.hpp"
 87 #include "runtime/timer.hpp"
 88 #include "runtime/trimNativeHeap.hpp"
 89 #include "runtime/vmOperations.hpp"
 90 #include "runtime/vmThread.hpp"
 91 #include "runtime/vm_version.hpp"
 92 #include "sanitizers/leak.hpp"
 93 #include "utilities/dtrace.hpp"
 94 #include "utilities/events.hpp"
 95 #include "utilities/globalDefinitions.hpp"
 96 #include "utilities/macros.hpp"
 97 #include "utilities/vmError.hpp"
 98 #ifdef COMPILER1
 99 #include "c1/c1_Compiler.hpp"
100 #include "c1/c1_Runtime1.hpp"
101 #endif
102 #ifdef COMPILER2
103 #include "code/compiledIC.hpp"
104 #include "opto/compile.hpp"
105 #include "opto/indexSet.hpp"
106 #include "opto/runtime.hpp"
107 #endif
108 #if INCLUDE_JFR
109 #include "jfr/jfr.hpp"
110 #endif
111 #if INCLUDE_JVMCI
112 #include "jvmci/jvmci.hpp"
113 #endif
114 
115 GrowableArray<Method*>* collected_profiled_methods;
116 
117 static int compare_methods(Method** a, Method** b) {
118   // compiled_invocation_count() returns int64_t, forcing the entire expression
119   // to be evaluated as int64_t. Overflow is not an issue.
120   int64_t diff = (((*b)->invocation_count() + (*b)->compiled_invocation_count())
121                 - ((*a)->invocation_count() + (*a)->compiled_invocation_count()));
122   return (diff < 0) ? -1 : (diff > 0) ? 1 : 0;
123 }
124 
125 static void collect_profiled_methods(Method* m) {
126   Thread* thread = Thread::current();
127   methodHandle mh(thread, m);
128   if ((m->method_data() != nullptr) &&
129       (PrintMethodData || CompilerOracle::should_print(mh))) {
130     collected_profiled_methods->push(m);
131   }
132 }
133 
134 static void print_method_profiling_data() {
135   if ((ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) &&
136      (PrintMethodData || CompilerOracle::should_print_methods())) {
137     ResourceMark rm;
138     collected_profiled_methods = new GrowableArray<Method*>(1024);
139     SystemDictionary::methods_do(collect_profiled_methods);
140     collected_profiled_methods->sort(&compare_methods);
141 
142     int count = collected_profiled_methods->length();
143     int total_size = 0;
144     if (count > 0) {
145       for (int index = 0; index < count; index++) {
146         Method* m = collected_profiled_methods->at(index);
147 
148         // Instead of taking tty lock, we collect all lines into a string stream
149         // and then print them all at once.
150         ResourceMark rm2;
151         stringStream ss;
152 
153         ss.print_cr("------------------------------------------------------------------------");
154         m->print_invocation_count(&ss);
155         ss.print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
156         ss.cr();
157         // Dump data on parameters if any
158         if (m->method_data() != nullptr && m->method_data()->parameters_type_data() != nullptr) {
159           ss.fill_to(2);
160           m->method_data()->parameters_type_data()->print_data_on(&ss);
161         }
162         m->print_codes_on(&ss);
163         tty->print("%s", ss.as_string()); // print all at once
164         total_size += m->method_data()->size_in_bytes();
165       }
166       tty->print_cr("------------------------------------------------------------------------");
167       tty->print_cr("Total MDO size: %d bytes", total_size);
168     }
169   }
170 }
171 
172 void perf_jvm_print_on(outputStream* st);
173 
174 void log_vm_init_stats(bool use_tty) {
175   LogStreamHandle(Info, init) log;
176   if (log.is_enabled()) {
177     outputStream* out = use_tty ? tty : &log;
178     SharedRuntime::print_counters_on(out);
179     LogStreamHandle(Info, perf, class, link) log2;
180     outputStream* out2 = use_tty ? tty : &log2;
181     ClassLoader::print_counters(out2);
182     ClassPreloader::print_counters();
183     out->cr();
184     // FIXME: intermittent crashes
185 //    if (CountBytecodesPerThread) {
186 //      log.print_cr("Thread info:");
187 //      class PrintThreadInfo : public ThreadClosure {
188 //        outputStream* _st;
189 //      public:
190 //        PrintThreadInfo(outputStream* st) : ThreadClosure(), _st(st) {}
191 //        void do_thread(Thread* thread) {
192 //          JavaThread* jt = JavaThread::cast(thread);
193 //          if (jt->bc_counter_value() > 0) {
194 //            _st->print_cr("  Thread " INTPTR_FORMAT ": %ld bytecodes executed (clinit: %ld)",
195 //                          p2i(jt), /*jt->name(),*/ jt->bc_counter_value(), jt->clinit_bc_counter_value());
196 //          }
197 //        }
198 //      };
199 //      PrintThreadInfo cl(&log);
200 //      Threads::java_threads_do(&cl);
201 //    }
202 //    log.cr();
203     out->print_cr("Deoptimization events: ");
204     Deoptimization::print_statistics_on(out);
205     out->cr();
206 
207     out->print("Compilation statistics: ");
208     CompileBroker::print_statistics_on(out);
209     out->cr();
210 
211     {
212       MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
213       out->print("Code cache statistics: ");
214       CodeCache::print_nmethod_statistics_on(out);
215       out->cr();
216     }
217 
218     if (SCCache::is_on_for_read()) {
219       out->print_cr("Startup Code Cache: ");
220       SCCache::print_statistics_on(out);
221       out->cr();
222       SCCache::print_timers_on(out);
223     }
224 
225     VMThread::print_counters_on(out);
226     out->cr();
227     MutexLockerImpl::print_counters_on(out);
228     out->cr();
229     out->print("Runtime events for thread \"main\"");
230     if (ProfileRuntimeCalls) {
231       out->print_cr(" (%d nested events):", ProfileVMCallContext::nested_runtime_calls_count());
232 
233       Runtime1::print_counters_on(out);
234       OptoRuntime::print_counters_on(out);
235       InterpreterRuntime::print_counters_on(out);
236       Deoptimization::print_counters_on(out);
237     } else {
238       out->print_cr(": no info (%s is disabled)", (UsePerfData ? "ProfileRuntimeCalls" : "UsePerfData"));
239     }
240     out->cr();
241     perf_jvm_print_on(out);
242     out->cr();
243     MethodHandles::print_counters_on(out);
244   }
245 }
246 
247 void print_bytecode_count() {
248   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
249     tty->print_cr("[BytecodeCounter::counter_value = %ld]", BytecodeCounter::counter_value());
250   }
251 }
252 
253 #ifndef PRODUCT
254 
255 // Statistics printing (method invocation histogram)
256 
257 GrowableArray<Method*>* collected_invoked_methods;
258 
259 static void collect_invoked_methods(Method* m) {
260   if (m->invocation_count() + m->compiled_invocation_count() >= 1) {
261     collected_invoked_methods->push(m);
262   }
263 }
264 
265 
266 // Invocation count accumulators should be unsigned long to shift the
267 // overflow border. Longer-running workloads tend to create invocation
268 // counts which already overflow 32-bit counters for individual methods.
269 static void print_method_invocation_histogram() {
270   ResourceMark rm;
271   collected_invoked_methods = new GrowableArray<Method*>(1024);
272   SystemDictionary::methods_do(collect_invoked_methods);
273   collected_invoked_methods->sort(&compare_methods);
274   //
275   tty->cr();
276   tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
277   tty->cr();
278   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
279   uint64_t total        = 0,
280            int_total    = 0,
281            comp_total   = 0,
282            special_total= 0,
283            static_total = 0,
284            final_total  = 0,
285            synch_total  = 0,
286            native_total = 0,
287            access_total = 0;
288   for (int index = 0; index < collected_invoked_methods->length(); index++) {
289     // Counter values returned from getter methods are signed int.
290     // To shift the overflow border by a factor of two, we interpret
291     // them here as unsigned long. A counter can't be negative anyway.
292     Method* m = collected_invoked_methods->at(index);
293     uint64_t iic = (uint64_t)m->invocation_count();
294     uint64_t cic = (uint64_t)m->compiled_invocation_count();
295     if ((iic + cic) >= (uint64_t)MethodHistogramCutoff) m->print_invocation_count(tty);
296     int_total  += iic;
297     comp_total += cic;
298     if (m->is_final())        final_total  += iic + cic;
299     if (m->is_static())       static_total += iic + cic;
300     if (m->is_synchronized()) synch_total  += iic + cic;
301     if (m->is_native())       native_total += iic + cic;
302     if (m->is_accessor())     access_total += iic + cic;
303   }
304   tty->cr();
305   total = int_total + comp_total;
306   special_total = final_total + static_total +synch_total + native_total + access_total;
307   tty->print_cr("Invocations summary for %d methods:", collected_invoked_methods->length());
308   double total_div = (double)total;
309   tty->print_cr("\t" UINT64_FORMAT_W(12) " (100%%)  total",           total);
310   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- interpreted", int_total,     100.0 * (double)int_total    / total_div);
311   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- compiled",    comp_total,    100.0 * (double)comp_total   / total_div);
312   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%) |- special methods (interpreted and compiled)",
313                                                                          special_total, 100.0 * (double)special_total/ total_div);
314   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%)    |- synchronized",synch_total,   100.0 * (double)synch_total  / total_div);
315   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%)    |- final",       final_total,   100.0 * (double)final_total  / total_div);
316   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%)    |- static",      static_total,  100.0 * (double)static_total / total_div);
317   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%)    |- native",      native_total,  100.0 * (double)native_total / total_div);
318   tty->print_cr("\t" UINT64_FORMAT_W(12) " (%4.1f%%)    |- accessor",    access_total,  100.0 * (double)access_total / total_div);
319   tty->cr();
320   SharedRuntime::print_call_statistics_on(tty);
321 }
322 
323 #else
324 
325 static void print_method_invocation_histogram() {}
326 
327 #endif // PRODUCT
328 
329 
330 // General statistics printing (profiling ...)
331 void print_statistics() {
332   if (ReplayTraining && PrintTrainingInfo) {
333     TrainingData::print_archived_training_data_on(tty);
334   }
335   if (CITime) {
336     CompileBroker::print_times();
337   }
338 
339 #ifdef COMPILER1
340   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
341     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
342     Runtime1::print_statistics_on(tty);
343     SharedRuntime::print_statistics();
344   }
345 #endif /* COMPILER1 */
346 
347 #ifdef COMPILER2
348   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
349     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
350     Compile::print_statistics();
351     Deoptimization::print_statistics();
352 #ifndef COMPILER1
353     SharedRuntime::print_statistics();
354 #endif //COMPILER1
355   }
356 
357   if (PrintLockStatistics) {
358     OptoRuntime::print_named_counters();
359   }
360 #ifdef ASSERT
361   if (CollectIndexSetStatistics) {
362     IndexSet::print_statistics();
363   }
364 #endif // ASSERT
365 #else // COMPILER2
366 #if INCLUDE_JVMCI
367 #ifndef COMPILER1
368   if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
369     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
370     Deoptimization::print_statistics();
371     SharedRuntime::print_statistics();
372   }
373 #endif // COMPILER1
374 #endif // INCLUDE_JVMCI
375 #endif // COMPILER2
376 
377   if (PrintNMethodStatistics) {
378     nmethod::print_statistics();
379   }
380   if (CountCompiledCalls) {
381     print_method_invocation_histogram();
382   }
383 
384   print_method_profiling_data();
385 
386   if (TimeOopMap) {
387     GenerateOopMap::print_time();
388   }
389   if (PrintSymbolTableSizeHistogram) {
390     SymbolTable::print_histogram();
391   }
392   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
393     BytecodeCounter::print();
394   }
395   if (PrintBytecodePairHistogram) {
396     BytecodePairHistogram::print();
397   }
398 
399   if (PrintCodeCache) {
400     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
401     CodeCache::print();
402   }
403 
404   // CodeHeap State Analytics.
405   if (PrintCodeHeapAnalytics) {
406     CompileBroker::print_heapinfo(nullptr, "all", 4096); // details
407   }
408 
409   LogStreamHandle(Debug, codecache, nmethod) log;
410   if (log.is_enabled()) {
411     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
412     CodeCache::print_nmethods_on(&log);
413   }
414 
415 #ifndef PRODUCT
416   if (PrintCodeCache2) {
417     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
418     CodeCache::print_internals();
419   }
420 #endif
421 
422   if (VerifyOops && Verbose) {
423     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
424   }
425 
426   print_bytecode_count();
427 
428   if (PrintSystemDictionaryAtExit) {
429     ResourceMark rm;
430     MutexLocker mcld(ClassLoaderDataGraph_lock);
431     SystemDictionary::print();
432   }
433 
434   if (PrintClassLoaderDataGraphAtExit) {
435     ResourceMark rm;
436     MutexLocker mcld(ClassLoaderDataGraph_lock);
437     ClassLoaderDataGraph::print();
438   }
439 
440   // Native memory tracking data
441   if (PrintNMTStatistics) {
442     MemTracker::final_report(tty);
443   }
444 
445   if (PrintMetaspaceStatisticsAtExit) {
446     MetaspaceUtils::print_basic_report(tty, 0);
447   }
448 
449   if (CompilerOracle::should_print_final_memstat_report()) {
450     CompilationMemoryStatistic::print_all_by_size(tty, false, 0);
451   }
452 
453   ThreadsSMRSupport::log_statistics();
454 
455   log_vm_init_stats(true /* use_tty */);
456 }
457 
458 // Note: before_exit() can be executed only once, if more than one threads
459 //       are trying to shutdown the VM at the same time, only one thread
460 //       can run before_exit() and all other threads must wait.
461 void before_exit(JavaThread* thread, bool halt) {
462   #define BEFORE_EXIT_NOT_RUN 0
463   #define BEFORE_EXIT_RUNNING 1
464   #define BEFORE_EXIT_DONE    2
465   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
466 
467   Events::log(thread, "Before exit entered");
468 
469   // Note: don't use a Mutex to guard the entire before_exit(), as
470   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
471   // A CAS or OSMutex would work just fine but then we need to manipulate
472   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
473   // for synchronization.
474   { MonitorLocker ml(BeforeExit_lock);
475     switch (_before_exit_status) {
476     case BEFORE_EXIT_NOT_RUN:
477       _before_exit_status = BEFORE_EXIT_RUNNING;
478       break;
479     case BEFORE_EXIT_RUNNING:
480       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
481         ml.wait();
482       }
483       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
484       return;
485     case BEFORE_EXIT_DONE:
486       // need block to avoid SS compiler bug
487       {
488         return;
489       }
490     }
491   }
492 
493   // At this point only one thread is executing this logic. Any other threads
494   // attempting to invoke before_exit() will wait above and return early once
495   // this thread finishes before_exit().
496 
497   // Do not add any additional shutdown logic between the above mutex logic and
498   // leak sanitizer logic below. Any additional shutdown code which performs some
499   // cleanup should be added after the leak sanitizer logic below.
500 
501 #ifdef LEAK_SANITIZER
502   // If we are built with LSan, we need to perform leak checking. If we are
503   // terminating normally, not halting and no VM error, we perform a normal
504   // leak check which terminates if leaks are found. If we are not terminating
505   // normally, halting or VM error, we perform a recoverable leak check which
506   // prints leaks but will not terminate.
507   if (!halt && !VMError::is_error_reported()) {
508     LSAN_DO_LEAK_CHECK();
509   } else {
510     // Ignore the return value.
511     static_cast<void>(LSAN_DO_RECOVERABLE_LEAK_CHECK());
512   }
513 #endif
514 
515   MethodProfiler::process_method_hotness();
516 
517   // Actual shutdown logic begins here.
518 
519 #if INCLUDE_JVMCI
520   if (EnableJVMCI) {
521     JVMCI::shutdown(thread);
522   }
523 #endif
524 
525 #if INCLUDE_CDS
526   ClassListWriter::write_resolved_constants();
527   ClassListWriter::write_reflection_data();
528   ClassListWriter::write_loader_negative_lookup_cache();
529   // Dynamic CDS dumping must happen whilst we can still reliably
530   // run Java code.
531   if (CDSConfig::is_dumping_preimage_static_archive()) {
532     // Creating the hotspot.cds.preimage file
533     MetaspaceShared::preload_and_dump(thread);
534   } else {
535     DynamicArchive::dump_at_exit(thread, ArchiveClassesAtExit);
536   }
537   assert(!thread->has_pending_exception(), "must be");
538 #endif
539 
540   SCCache::close(); // Write final data and close archive
541 
542   // Hang forever on exit if we're reporting an error.
543   if (ShowMessageBoxOnError && VMError::is_error_reported()) {
544     os::infinite_sleep();
545   }
546 
547   EventThreadEnd event;
548   if (event.should_commit()) {
549     event.set_thread(JFR_JVM_THREAD_ID(thread));
550     event.commit();
551   }
552 
553   JFR_ONLY(Jfr::on_vm_shutdown(false, halt);)
554 
555   // Stop the WatcherThread. We do this before disenrolling various
556   // PeriodicTasks to reduce the likelihood of races.
557   WatcherThread::stop();
558 
559   // shut down the StatSampler task
560   StatSampler::disengage();
561   StatSampler::destroy();
562 
563   NativeHeapTrimmer::cleanup();
564 
565   // Stop concurrent GC threads
566   Universe::heap()->stop();
567 
568   // Print GC/heap related information.
569   Log(gc, heap, exit) log;
570   if (log.is_info()) {
571     ResourceMark rm;
572     LogStream ls_info(log.info());
573     Universe::print_on(&ls_info);
574     if (log.is_trace()) {
575       LogStream ls_trace(log.trace());
576       MutexLocker mcld(ClassLoaderDataGraph_lock);
577       ClassLoaderDataGraph::print_on(&ls_trace);
578     }
579   }
580 
581   if (PrintBytecodeHistogram) {
582     BytecodeHistogram::print(PrintBytecodeHistogramCutoff);
583   }
584 
585 #ifdef LINUX
586   if (DumpPerfMapAtExit) {
587     CodeCache::write_perf_map();
588   }
589   if (PrintMemoryMapAtExit) {
590     MemMapPrinter::print_all_mappings(tty, false);
591   }
592 #endif
593 
594   if (JvmtiExport::should_post_thread_life()) {
595     JvmtiExport::post_thread_end(thread);
596   }
597 
598   // Always call even when there are not JVMTI environments yet, since environments
599   // may be attached late and JVMTI must track phases of VM execution
600   JvmtiExport::post_vm_death();
601   JvmtiAgentList::unload_agents();
602 
603   // Terminate the signal thread
604   // Note: we don't wait until it actually dies.
605   os::terminate_signal_thread();
606 
607   if (VerifyTrainingData) {
608     EXCEPTION_MARK;
609     CompilationPolicy::replay_training_at_init(true, THREAD); // implies TrainingData::verify()
610   }
611 
612   print_statistics();
613   Universe::heap()->print_tracing_info();
614 
615   { MutexLocker ml(BeforeExit_lock);
616     _before_exit_status = BEFORE_EXIT_DONE;
617     BeforeExit_lock->notify_all();
618   }
619 
620   if (VerifyStringTableAtExit) {
621     size_t fail_cnt = StringTable::verify_and_compare_entries();
622     if (fail_cnt != 0) {
623       tty->print_cr("ERROR: fail_cnt=" SIZE_FORMAT, fail_cnt);
624       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
625     }
626   }
627 
628   #undef BEFORE_EXIT_NOT_RUN
629   #undef BEFORE_EXIT_RUNNING
630   #undef BEFORE_EXIT_DONE
631 }
632 
633 void vm_exit(int code) {
634   Thread* thread =
635       ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : nullptr;
636   if (thread == nullptr) {
637     // very early initialization failure -- just exit
638     vm_direct_exit(code);
639   }
640 
641   // We'd like to add an entry to the XML log to show that the VM is
642   // terminating, but we can't safely do that here. The logic to make
643   // XML termination logging safe is tied to the termination of the
644   // VMThread, and it doesn't terminate on this exit path. See 8222534.
645 
646   if (VMThread::vm_thread() != nullptr) {
647     if (thread->is_Java_thread()) {
648       // We must be "in_vm" for the code below to work correctly.
649       // Historically there must have been some exit path for which
650       // that was not the case and so we set it explicitly - even
651       // though we no longer know what that path may be.
652       JavaThread::cast(thread)->set_thread_state(_thread_in_vm);
653     }
654 
655     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
656     VM_Exit op(code);
657 
658     // 4945125 The vm thread comes to a safepoint during exit.
659     // GC vm_operations can get caught at the safepoint, and the
660     // heap is unparseable if they are caught. Grab the Heap_lock
661     // to prevent this. The GC vm_operations will not be able to
662     // queue until after we release it, but we never do that as we
663     // are terminating the VM process.
664     MutexLocker ml(Heap_lock);
665 
666     VMThread::execute(&op);
667     // should never reach here; but in case something wrong with VM Thread.
668     vm_direct_exit(code);
669   } else {
670     // VM thread is gone, just exit
671     vm_direct_exit(code);
672   }
673   ShouldNotReachHere();
674 }
675 
676 void notify_vm_shutdown() {
677   // For now, just a dtrace probe.
678   HOTSPOT_VM_SHUTDOWN();
679 }
680 
681 void vm_direct_exit(int code) {
682   notify_vm_shutdown();
683   os::wait_for_keypress_at_exit();
684   os::exit(code);
685 }
686 
687 void vm_direct_exit(int code, const char* message) {
688   if (message != nullptr) {
689     tty->print_cr("%s", message);
690   }
691   vm_direct_exit(code);
692 }
693 
694 static void vm_perform_shutdown_actions() {
695   if (is_init_completed()) {
696     Thread* thread = Thread::current_or_null();
697     if (thread != nullptr && thread->is_Java_thread()) {
698       // We are leaving the VM, set state to native (in case any OS exit
699       // handlers call back to the VM)
700       JavaThread* jt = JavaThread::cast(thread);
701       // Must always be walkable or have no last_Java_frame when in
702       // thread_in_native
703       jt->frame_anchor()->make_walkable();
704       jt->set_thread_state(_thread_in_native);
705     }
706   }
707   notify_vm_shutdown();
708 }
709 
710 void vm_shutdown()
711 {
712   vm_perform_shutdown_actions();
713   os::wait_for_keypress_at_exit();
714   os::shutdown();
715 }
716 
717 void vm_abort(bool dump_core) {
718   vm_perform_shutdown_actions();
719   os::wait_for_keypress_at_exit();
720 
721   // Flush stdout and stderr before abort.
722   fflush(stdout);
723   fflush(stderr);
724 
725   os::abort(dump_core);
726   ShouldNotReachHere();
727 }
728 
729 static void vm_notify_during_cds_dumping(const char* error, const char* message) {
730   if (error != nullptr) {
731     tty->print_cr("Error occurred during CDS dumping");
732     tty->print("%s", error);
733     if (message != nullptr) {
734       tty->print_cr(": %s", message);
735     }
736     else {
737       tty->cr();
738     }
739   }
740 }
741 
742 void vm_exit_during_cds_dumping(const char* error, const char* message) {
743   vm_notify_during_cds_dumping(error, message);
744 
745   // Failure during CDS dumping, we don't want to dump core
746   vm_abort(false);
747 }
748 
749 static void vm_notify_during_shutdown(const char* error, const char* message) {
750   if (error != nullptr) {
751     tty->print_cr("Error occurred during initialization of VM");
752     tty->print("%s", error);
753     if (message != nullptr) {
754       tty->print_cr(": %s", message);
755     }
756     else {
757       tty->cr();
758     }
759   }
760   if (ShowMessageBoxOnError && WizardMode) {
761     fatal("Error occurred during initialization of VM");
762   }
763 }
764 
765 void vm_exit_during_initialization() {
766   vm_notify_during_shutdown(nullptr, nullptr);
767 
768   // Failure during initialization, we don't want to dump core
769   vm_abort(false);
770 }
771 
772 void vm_exit_during_initialization(Handle exception) {
773   tty->print_cr("Error occurred during initialization of VM");
774   // If there are exceptions on this thread it must be cleared
775   // first and here. Any future calls to EXCEPTION_MARK requires
776   // that no pending exceptions exist.
777   JavaThread* THREAD = JavaThread::current(); // can't be null
778   if (HAS_PENDING_EXCEPTION) {
779     CLEAR_PENDING_EXCEPTION;
780   }
781   java_lang_Throwable::print_stack_trace(exception, tty);
782   tty->cr();
783   vm_notify_during_shutdown(nullptr, nullptr);
784 
785   // Failure during initialization, we don't want to dump core
786   vm_abort(false);
787 }
788 
789 void vm_exit_during_initialization(Symbol* ex, const char* message) {
790   ResourceMark rm;
791   vm_notify_during_shutdown(ex->as_C_string(), message);
792 
793   // Failure during initialization, we don't want to dump core
794   vm_abort(false);
795 }
796 
797 void vm_exit_during_initialization(const char* error, const char* message) {
798   vm_notify_during_shutdown(error, message);
799 
800   // Failure during initialization, we don't want to dump core
801   vm_abort(false);
802 }
803 
804 void vm_shutdown_during_initialization(const char* error, const char* message) {
805   vm_notify_during_shutdown(error, message);
806   vm_shutdown();
807 }
808 
809 JDK_Version JDK_Version::_current;
810 const char* JDK_Version::_java_version;
811 const char* JDK_Version::_runtime_name;
812 const char* JDK_Version::_runtime_version;
813 const char* JDK_Version::_runtime_vendor_version;
814 const char* JDK_Version::_runtime_vendor_vm_bug_url;
815 
816 void JDK_Version::initialize() {
817   assert(!_current.is_valid(), "Don't initialize twice");
818 
819   int major = VM_Version::vm_major_version();
820   int minor = VM_Version::vm_minor_version();
821   int security = VM_Version::vm_security_version();
822   int build = VM_Version::vm_build_number();
823   int patch = VM_Version::vm_patch_version();
824   _current = JDK_Version(major, minor, security, patch, build);
825 }
826 
827 void JDK_Version_init() {
828   JDK_Version::initialize();
829 }
830 
831 static int64_t encode_jdk_version(const JDK_Version& v) {
832   return
833     ((int64_t)v.major_version()          << (BitsPerByte * 4)) |
834     ((int64_t)v.minor_version()          << (BitsPerByte * 3)) |
835     ((int64_t)v.security_version()       << (BitsPerByte * 2)) |
836     ((int64_t)v.patch_version()          << (BitsPerByte * 1)) |
837     ((int64_t)v.build_number()           << (BitsPerByte * 0));
838 }
839 
840 int JDK_Version::compare(const JDK_Version& other) const {
841   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
842   uint64_t e = encode_jdk_version(*this);
843   uint64_t o = encode_jdk_version(other);
844   return (e > o) ? 1 : ((e == o) ? 0 : -1);
845 }
846 
847 /* See JEP 223 */
848 void JDK_Version::to_string(char* buffer, size_t buflen) const {
849   assert(buffer && buflen > 0, "call with useful buffer");
850   size_t index = 0;
851 
852   if (!is_valid()) {
853     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
854   } else {
855     int rc = jio_snprintf(
856         &buffer[index], buflen - index, "%d.%d", _major, _minor);
857     if (rc == -1) return;
858     index += rc;
859     if (_patch > 0) {
860       rc = jio_snprintf(&buffer[index], buflen - index, ".%d.%d", _security, _patch);
861       if (rc == -1) return;
862       index += rc;
863     } else if (_security > 0) {
864       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
865       if (rc == -1) return;
866       index += rc;
867     }
868     if (_build > 0) {
869       rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
870       if (rc == -1) return;
871       index += rc;
872     }
873   }
874 }