1 /*
   2  * Copyright (c) 1997, 2016, 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 "classfile/classLoader.hpp"
  27 #include "classfile/symbolTable.hpp"
  28 #include "classfile/systemDictionary.hpp"
  29 #include "code/codeCache.hpp"
  30 #include "compiler/compileBroker.hpp"
  31 #include "compiler/compilerOracle.hpp"
  32 #include "interpreter/bytecodeHistogram.hpp"
  33 #include "jfr/jfrEvents.hpp"
  34 #include "jfr/support/jfrThreadId.hpp"
  35 #include "memory/genCollectedHeap.hpp"
  36 #include "memory/oopFactory.hpp"
  37 #include "memory/universe.hpp"
  38 #include "oops/constantPool.hpp"
  39 #include "oops/generateOopMap.hpp"
  40 #include "oops/instanceKlass.hpp"
  41 #include "oops/instanceOop.hpp"
  42 #include "oops/method.hpp"
  43 #include "oops/objArrayOop.hpp"
  44 #include "oops/oop.inline.hpp"
  45 #include "oops/symbol.hpp"
  46 #include "prims/jvmtiExport.hpp"
  47 #include "runtime/arguments.hpp"
  48 #include "runtime/biasedLocking.hpp"
  49 #include "runtime/compilationPolicy.hpp"
  50 #include "runtime/fprofiler.hpp"
  51 #include "runtime/init.hpp"
  52 #include "runtime/interfaceSupport.hpp"
  53 #include "runtime/java.hpp"
  54 #include "runtime/memprofiler.hpp"
  55 #include "runtime/sharedRuntime.hpp"
  56 #include "runtime/statSampler.hpp"
  57 #include "runtime/sweeper.hpp"
  58 #include "runtime/task.hpp"
  59 #include "runtime/thread.inline.hpp"
  60 #include "runtime/timer.hpp"
  61 #include "runtime/vm_operations.hpp"
  62 #include "services/memTracker.hpp"
  63 #include "utilities/dtrace.hpp"
  64 #include "utilities/globalDefinitions.hpp"
  65 #include "utilities/histogram.hpp"
  66 #include "utilities/macros.hpp"
  67 #include "utilities/vmError.hpp"
  68 #ifdef TARGET_ARCH_x86
  69 # include "vm_version_x86.hpp"
  70 #endif
  71 #ifdef TARGET_ARCH_sparc
  72 # include "vm_version_sparc.hpp"
  73 #endif
  74 #ifdef TARGET_ARCH_zero
  75 # include "vm_version_zero.hpp"
  76 #endif
  77 #ifdef TARGET_ARCH_arm
  78 # include "vm_version_arm.hpp"
  79 #endif
  80 #ifdef TARGET_ARCH_ppc
  81 # include "vm_version_ppc.hpp"
  82 #endif
  83 #if INCLUDE_ALL_GCS
  84 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
  85 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
  86 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
  87 #endif // INCLUDE_ALL_GCS
  88 #ifdef COMPILER1
  89 #include "c1/c1_Compiler.hpp"
  90 #include "c1/c1_Runtime1.hpp"
  91 #endif
  92 #ifdef COMPILER2
  93 #include "code/compiledIC.hpp"
  94 #include "compiler/methodLiveness.hpp"
  95 #include "opto/compile.hpp"
  96 #include "opto/indexSet.hpp"
  97 #include "opto/runtime.hpp"
  98 #endif
  99 #if INCLUDE_JFR
 100 #include "jfr/jfr.hpp"
 101 #endif
 102 
 103 #ifndef USDT2
 104 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
 105 #endif /* !USDT2 */
 106 
 107 #ifndef PRODUCT
 108 
 109 // Statistics printing (method invocation histogram)
 110 
 111 GrowableArray<Method*>* collected_invoked_methods;
 112 
 113 void collect_invoked_methods(Method* m) {
 114   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 115     collected_invoked_methods->push(m);
 116   }
 117 }
 118 
 119 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 120 
 121 GrowableArray<Method*>* collected_profiled_methods;
 122 
 123 void collect_profiled_methods(Method* m) {
 124   Thread* thread = Thread::current();
 125   // This HandleMark prevents a huge amount of handles from being added
 126   // to the metadata_handles() array on the thread.
 127   HandleMark hm(thread);
 128   methodHandle mh(thread, m);
 129   if ((m->method_data() != NULL) &&
 130       (PrintMethodData || CompilerOracle::should_print(mh))) {
 131     collected_profiled_methods->push(m);
 132   }
 133 }
 134 
 135 
 136 int compare_methods(Method** a, Method** b) {
 137   // %%% there can be 32-bit overflow here
 138   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
 139        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
 140 }
 141 
 142 
 143 void print_method_invocation_histogram() {
 144   ResourceMark rm;
 145   HandleMark hm;
 146   collected_invoked_methods = new GrowableArray<Method*>(1024);
 147   SystemDictionary::methods_do(collect_invoked_methods);
 148   collected_invoked_methods->sort(&compare_methods);
 149   //
 150   tty->cr();
 151   tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
 152   tty->cr();
 153   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 154   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 155       synch_total = 0, nativ_total = 0, acces_total = 0;
 156   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 157     Method* m = collected_invoked_methods->at(index);
 158     int c = m->invocation_count() + m->compiled_invocation_count();
 159     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 160     int_total  += m->invocation_count();
 161     comp_total += m->compiled_invocation_count();
 162     if (m->is_final())        final_total  += c;
 163     if (m->is_static())       static_total += c;
 164     if (m->is_synchronized()) synch_total  += c;
 165     if (m->is_native())       nativ_total  += c;
 166     if (m->is_accessor())     acces_total  += c;
 167   }
 168   tty->cr();
 169   total = int_total + comp_total;
 170   tty->print_cr("Invocations summary:");
 171   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 172   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 173   tty->print_cr("\t%9d (100%%)  total",         total);
 174   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 175   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 176   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 177   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 178   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 179   tty->cr();
 180   SharedRuntime::print_call_statistics(comp_total);
 181 }
 182 
 183 void print_method_profiling_data() {
 184   ResourceMark rm;
 185   HandleMark hm;
 186   collected_profiled_methods = new GrowableArray<Method*>(1024);
 187   SystemDictionary::methods_do(collect_profiled_methods);
 188   collected_profiled_methods->sort(&compare_methods);
 189 
 190   int count = collected_profiled_methods->length();
 191   int total_size = 0;
 192   if (count > 0) {
 193     for (int index = 0; index < count; index++) {
 194       Method* m = collected_profiled_methods->at(index);
 195       ttyLocker ttyl;
 196       tty->print_cr("------------------------------------------------------------------------");
 197       //m->print_name(tty);
 198       m->print_invocation_count();
 199       tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
 200       tty->cr();
 201       // Dump data on parameters if any
 202       if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
 203         tty->fill_to(2);
 204         m->method_data()->parameters_type_data()->print_data_on(tty);
 205       }
 206       m->print_codes();
 207       total_size += m->method_data()->size_in_bytes();
 208     }
 209     tty->print_cr("------------------------------------------------------------------------");
 210     tty->print_cr("Total MDO size: %d bytes", total_size);
 211   }
 212 }
 213 
 214 void print_bytecode_count() {
 215   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 216     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 217   }
 218 }
 219 
 220 AllocStats alloc_stats;
 221 
 222 
 223 
 224 // General statistics printing (profiling ...)
 225 void print_statistics() {
 226 #ifdef ASSERT
 227 
 228   if (CountRuntimeCalls) {
 229     extern Histogram *RuntimeHistogram;
 230     RuntimeHistogram->print();
 231   }
 232 
 233   if (CountJNICalls) {
 234     extern Histogram *JNIHistogram;
 235     JNIHistogram->print();
 236   }
 237 
 238   if (CountJVMCalls) {
 239     extern Histogram *JVMHistogram;
 240     JVMHistogram->print();
 241   }
 242 
 243 #endif
 244 
 245   if (MemProfiling) {
 246     MemProfiler::disengage();
 247   }
 248 
 249   if (CITime) {
 250     CompileBroker::print_times();
 251   }
 252 
 253 #ifdef COMPILER1
 254   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
 255     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
 256     Runtime1::print_statistics();
 257     Deoptimization::print_statistics();
 258     SharedRuntime::print_statistics();
 259     nmethod::print_statistics();
 260   }
 261 #endif /* COMPILER1 */
 262 
 263 #ifdef COMPILER2
 264   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
 265     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
 266     Compile::print_statistics();
 267 #ifndef COMPILER1
 268     Deoptimization::print_statistics();
 269     nmethod::print_statistics();
 270     SharedRuntime::print_statistics();
 271 #endif //COMPILER1
 272     os::print_statistics();
 273   }
 274 
 275   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 276     OptoRuntime::print_named_counters();
 277   }
 278 
 279   if (TimeLivenessAnalysis) {
 280     MethodLiveness::print_times();
 281   }
 282 #ifdef ASSERT
 283   if (CollectIndexSetStatistics) {
 284     IndexSet::print_statistics();
 285   }
 286 #endif // ASSERT
 287 #endif // COMPILER2
 288   if (CountCompiledCalls) {
 289     print_method_invocation_histogram();
 290   }
 291   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
 292     print_method_profiling_data();
 293   }
 294   if (TimeCompiler) {
 295     COMPILER2_PRESENT(Compile::print_timers();)
 296   }
 297   if (TimeCompilationPolicy) {
 298     CompilationPolicy::policy()->print_time();
 299   }
 300   if (TimeOopMap) {
 301     GenerateOopMap::print_time();
 302   }
 303   if (ProfilerCheckIntervals) {
 304     PeriodicTask::print_intervals();
 305   }
 306   if (PrintSymbolTableSizeHistogram) {
 307     SymbolTable::print_histogram();
 308   }
 309   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 310     BytecodeCounter::print();
 311   }
 312   if (PrintBytecodePairHistogram) {
 313     BytecodePairHistogram::print();
 314   }
 315 
 316   if (PrintCodeCache) {
 317     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 318     CodeCache::print();
 319   }
 320 
 321   if (PrintMethodFlushingStatistics) {
 322     NMethodSweeper::print();
 323   }
 324 
 325   if (PrintCodeCache2) {
 326     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 327     CodeCache::print_internals();
 328   }
 329 
 330   if (PrintClassStatistics) {
 331     SystemDictionary::print_class_statistics();
 332   }
 333   if (PrintMethodStatistics) {
 334     SystemDictionary::print_method_statistics();
 335   }
 336 
 337   if (PrintVtableStats) {
 338     klassVtable::print_statistics();
 339     klassItable::print_statistics();
 340   }
 341   if (VerifyOops) {
 342     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 343   }
 344 
 345   print_bytecode_count();
 346   if (PrintMallocStatistics) {
 347     tty->print("allocation stats: ");
 348     alloc_stats.print();
 349     tty->cr();
 350   }
 351 
 352   if (PrintSystemDictionaryAtExit) {
 353     SystemDictionary::print();
 354   }
 355 
 356   if (PrintBiasedLockingStatistics) {
 357     BiasedLocking::print_counters();
 358   }
 359 
 360 #ifdef ENABLE_ZAP_DEAD_LOCALS
 361 #ifdef COMPILER2
 362   if (ZapDeadCompiledLocals) {
 363     tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
 364     tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
 365   }
 366 #endif // COMPILER2
 367 #endif // ENABLE_ZAP_DEAD_LOCALS
 368   // Native memory tracking data
 369   if (PrintNMTStatistics) {
 370     MemTracker::final_report(tty);
 371   }
 372 }
 373 
 374 #else // PRODUCT MODE STATISTICS
 375 
 376 void print_statistics() {
 377 
 378   if (CITime) {
 379     CompileBroker::print_times();
 380   }
 381 
 382   if (PrintCodeCache) {
 383     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 384     CodeCache::print();
 385   }
 386 
 387   if (PrintMethodFlushingStatistics) {
 388     NMethodSweeper::print();
 389   }
 390 
 391 #ifdef COMPILER2
 392   if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 393     OptoRuntime::print_named_counters();
 394   }
 395 #endif
 396   if (PrintBiasedLockingStatistics) {
 397     BiasedLocking::print_counters();
 398   }
 399 
 400   // Native memory tracking data
 401   if (PrintNMTStatistics) {
 402     MemTracker::final_report(tty);
 403   }
 404 }
 405 
 406 #endif
 407 
 408 
 409 // Helper class for registering on_exit calls through JVM_OnExit
 410 
 411 extern "C" {
 412     typedef void (*__exit_proc)(void);
 413 }
 414 
 415 class ExitProc : public CHeapObj<mtInternal> {
 416  private:
 417   __exit_proc _proc;
 418   // void (*_proc)(void);
 419   ExitProc* _next;
 420  public:
 421   // ExitProc(void (*proc)(void)) {
 422   ExitProc(__exit_proc proc) {
 423     _proc = proc;
 424     _next = NULL;
 425   }
 426   void evaluate()               { _proc(); }
 427   ExitProc* next() const        { return _next; }
 428   void set_next(ExitProc* next) { _next = next; }
 429 };
 430 
 431 
 432 // Linked list of registered on_exit procedures
 433 
 434 static ExitProc* exit_procs = NULL;
 435 
 436 
 437 extern "C" {
 438   void register_on_exit_function(void (*func)(void)) {
 439     ExitProc *entry = new ExitProc(func);
 440     // Classic vm does not throw an exception in case the allocation failed,
 441     if (entry != NULL) {
 442       entry->set_next(exit_procs);
 443       exit_procs = entry;
 444     }
 445   }
 446 }
 447 
 448 // Note: before_exit() can be executed only once, if more than one threads
 449 //       are trying to shutdown the VM at the same time, only one thread
 450 //       can run before_exit() and all other threads must wait.
 451 void before_exit(JavaThread * thread) {
 452   #define BEFORE_EXIT_NOT_RUN 0
 453   #define BEFORE_EXIT_RUNNING 1
 454   #define BEFORE_EXIT_DONE    2
 455   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 456 
 457   // Note: don't use a Mutex to guard the entire before_exit(), as
 458   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 459   // A CAS or OSMutex would work just fine but then we need to manipulate
 460   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 461   // for synchronization.
 462   { MutexLocker ml(BeforeExit_lock);
 463     switch (_before_exit_status) {
 464     case BEFORE_EXIT_NOT_RUN:
 465       _before_exit_status = BEFORE_EXIT_RUNNING;
 466       break;
 467     case BEFORE_EXIT_RUNNING:
 468       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 469         BeforeExit_lock->wait();
 470       }
 471       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 472       return;
 473     case BEFORE_EXIT_DONE:
 474       return;
 475     }
 476   }
 477 
 478   // The only difference between this and Win32's _onexit procs is that
 479   // this version is invoked before any threads get killed.
 480   ExitProc* current = exit_procs;
 481   while (current != NULL) {
 482     ExitProc* next = current->next();
 483     current->evaluate();
 484     delete current;
 485     current = next;
 486   }
 487 
 488   // Hang forever on exit if we're reporting an error.
 489   if (ShowMessageBoxOnError && is_error_reported()) {
 490     os::infinite_sleep();
 491   }
 492 
 493   // Terminate watcher thread - must before disenrolling any periodic task
 494   if (PeriodicTask::num_tasks() > 0)
 495     WatcherThread::stop();
 496 
 497   // Print statistics gathered (profiling ...)
 498   if (Arguments::has_profile()) {
 499     FlatProfiler::disengage();
 500     FlatProfiler::print(10);
 501   }
 502 
 503   // shut down the StatSampler task
 504   StatSampler::disengage();
 505   StatSampler::destroy();
 506 
 507   // Stop concurrent GC threads
 508   Universe::heap()->stop();
 509 
 510   // Print GC/heap related information.
 511   if (PrintGCDetails) {
 512     Universe::print();
 513     AdaptiveSizePolicyOutput(0);
 514     if (Verbose) {
 515       ClassLoaderDataGraph::dump_on(gclog_or_tty);
 516     }
 517   }
 518 
 519   if (PrintBytecodeHistogram) {
 520     BytecodeHistogram::print();
 521   }
 522 
 523   if (JvmtiExport::should_post_thread_life()) {
 524     JvmtiExport::post_thread_end(thread);
 525   }
 526 
 527 
 528   EventThreadEnd event;
 529   if (event.should_commit()) {
 530     event.set_thread(JFR_THREAD_ID(thread));
 531     event.commit();
 532   }
 533 
 534   JFR_ONLY(Jfr::on_vm_shutdown();)
 535 
 536   // Always call even when there are not JVMTI environments yet, since environments
 537   // may be attached late and JVMTI must track phases of VM execution
 538   JvmtiExport::post_vm_death();
 539   Threads::shutdown_vm_agents();
 540 
 541   // Terminate the signal thread
 542   // Note: we don't wait until it actually dies.
 543   os::terminate_signal_thread();
 544 
 545   print_statistics();
 546   Universe::heap()->print_tracing_info();
 547 
 548   { MutexLocker ml(BeforeExit_lock);
 549     _before_exit_status = BEFORE_EXIT_DONE;
 550     BeforeExit_lock->notify_all();
 551   }
 552 
 553   if (VerifyStringTableAtExit) {
 554     int fail_cnt = 0;
 555     {
 556       MutexLocker ml(StringTable_lock);
 557       fail_cnt = StringTable::verify_and_compare_entries();
 558     }
 559 
 560     if (fail_cnt != 0) {
 561       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
 562       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 563     }
 564   }
 565 
 566   #undef BEFORE_EXIT_NOT_RUN
 567   #undef BEFORE_EXIT_RUNNING
 568   #undef BEFORE_EXIT_DONE
 569 }
 570 
 571 void vm_exit(int code) {
 572   Thread* thread = ThreadLocalStorage::is_initialized() ?
 573     ThreadLocalStorage::get_thread_slow() : NULL;
 574   if (thread == NULL) {
 575     // we have serious problems -- just exit
 576     vm_direct_exit(code);
 577   }
 578 
 579   if (VMThread::vm_thread() != NULL) {
 580     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 581     VM_Exit op(code);
 582     if (thread->is_Java_thread())
 583       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 584     VMThread::execute(&op);
 585     // should never reach here; but in case something wrong with VM Thread.
 586     vm_direct_exit(code);
 587   } else {
 588     // VM thread is gone, just exit
 589     vm_direct_exit(code);
 590   }
 591   ShouldNotReachHere();
 592 }
 593 
 594 void notify_vm_shutdown() {
 595   // For now, just a dtrace probe.
 596 #ifndef USDT2
 597   HS_DTRACE_PROBE(hotspot, vm__shutdown);
 598   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 599 #else /* USDT2 */
 600   HOTSPOT_VM_SHUTDOWN();
 601 #endif /* USDT2 */
 602 }
 603 
 604 void vm_direct_exit(int code) {
 605   notify_vm_shutdown();
 606   os::wait_for_keypress_at_exit();
 607   ::exit(code);
 608 }
 609 
 610 void vm_perform_shutdown_actions() {
 611   // Warning: do not call 'exit_globals()' here. All threads are still running.
 612   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 613   // kinds of assertions to trigger in debug mode.
 614   if (is_init_completed()) {
 615     Thread* thread = ThreadLocalStorage::is_initialized() ?
 616                      ThreadLocalStorage::get_thread_slow() : NULL;
 617     if (thread != NULL && thread->is_Java_thread()) {
 618       // We are leaving the VM, set state to native (in case any OS exit
 619       // handlers call back to the VM)
 620       JavaThread* jt = (JavaThread*)thread;
 621       // Must always be walkable or have no last_Java_frame when in
 622       // thread_in_native
 623       jt->frame_anchor()->make_walkable(jt);
 624       jt->set_thread_state(_thread_in_native);
 625     }
 626   }
 627   notify_vm_shutdown();
 628 }
 629 
 630 void vm_shutdown()
 631 {
 632   vm_perform_shutdown_actions();
 633   os::wait_for_keypress_at_exit();
 634   os::shutdown();
 635 }
 636 
 637 void vm_abort(bool dump_core) {
 638   vm_perform_shutdown_actions();
 639   os::wait_for_keypress_at_exit();
 640   os::abort(dump_core);
 641   ShouldNotReachHere();
 642 }
 643 
 644 void vm_notify_during_shutdown(const char* error, const char* message) {
 645   if (error != NULL) {
 646     tty->print_cr("Error occurred during initialization of VM");
 647     tty->print("%s", error);
 648     if (message != NULL) {
 649       tty->print_cr(": %s", message);
 650     }
 651     else {
 652       tty->cr();
 653     }
 654   }
 655   if (ShowMessageBoxOnError && WizardMode) {
 656     fatal("Error occurred during initialization of VM");
 657   }
 658 }
 659 
 660 void vm_exit_during_initialization(Handle exception) {
 661   tty->print_cr("Error occurred during initialization of VM");
 662   // If there are exceptions on this thread it must be cleared
 663   // first and here. Any future calls to EXCEPTION_MARK requires
 664   // that no pending exceptions exist.
 665   Thread *THREAD = Thread::current();
 666   if (HAS_PENDING_EXCEPTION) {
 667     CLEAR_PENDING_EXCEPTION;
 668   }
 669   java_lang_Throwable::print(exception, tty);
 670   tty->cr();
 671   java_lang_Throwable::print_stack_trace(exception(), tty);
 672   tty->cr();
 673   vm_notify_during_shutdown(NULL, NULL);
 674 
 675   // Failure during initialization, we don't want to dump core
 676   vm_abort(false);
 677 }
 678 
 679 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 680   ResourceMark rm;
 681   vm_notify_during_shutdown(ex->as_C_string(), message);
 682 
 683   // Failure during initialization, we don't want to dump core
 684   vm_abort(false);
 685 }
 686 
 687 void vm_exit_during_initialization(const char* error, const char* message) {
 688   vm_notify_during_shutdown(error, message);
 689 
 690   // Failure during initialization, we don't want to dump core
 691   vm_abort(false);
 692 }
 693 
 694 void vm_shutdown_during_initialization(const char* error, const char* message) {
 695   vm_notify_during_shutdown(error, message);
 696   vm_shutdown();
 697 }
 698 
 699 JDK_Version JDK_Version::_current;
 700 const char* JDK_Version::_runtime_name;
 701 const char* JDK_Version::_runtime_version;
 702 
 703 void JDK_Version::initialize() {
 704   jdk_version_info info;
 705   assert(!_current.is_valid(), "Don't initialize twice");
 706 
 707   void *lib_handle = os::native_java_library();
 708   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 709      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 710 
 711   if (func == NULL) {
 712     // JDK older than 1.6
 713     _current._partially_initialized = true;
 714   } else {
 715     (*func)(&info, sizeof(info));
 716 
 717     int major = JDK_VERSION_MAJOR(info.jdk_version);
 718     int minor = JDK_VERSION_MINOR(info.jdk_version);
 719     int micro = JDK_VERSION_MICRO(info.jdk_version);
 720     int build = JDK_VERSION_BUILD(info.jdk_version);
 721     if (major == 1 && minor > 4) {
 722       // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
 723       major = minor;
 724       minor = micro;
 725       micro = 0;
 726     }
 727     _current = JDK_Version(major, minor, micro, info.update_version,
 728                            info.special_update_version, build,
 729                            info.thread_park_blocker == 1,
 730                            info.post_vm_init_hook_enabled == 1,
 731                            info.pending_list_uses_discovered_field == 1);
 732   }
 733 }
 734 
 735 void JDK_Version::fully_initialize(
 736     uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
 737   // This is only called when current is less than 1.6 and we've gotten
 738   // far enough in the initialization to determine the exact version.
 739   assert(major < 6, "not needed for JDK version >= 6");
 740   assert(is_partially_initialized(), "must not initialize");
 741   if (major < 5) {
 742     // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
 743     micro = minor;
 744     minor = major;
 745     major = 1;
 746   }
 747   _current = JDK_Version(major, minor, micro, update);
 748 }
 749 
 750 void JDK_Version_init() {
 751   JDK_Version::initialize();
 752 }
 753 
 754 static int64_t encode_jdk_version(const JDK_Version& v) {
 755   return
 756     ((int64_t)v.major_version()          << (BitsPerByte * 5)) |
 757     ((int64_t)v.minor_version()          << (BitsPerByte * 4)) |
 758     ((int64_t)v.micro_version()          << (BitsPerByte * 3)) |
 759     ((int64_t)v.update_version()         << (BitsPerByte * 2)) |
 760     ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
 761     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 762 }
 763 
 764 int JDK_Version::compare(const JDK_Version& other) const {
 765   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 766   if (!is_partially_initialized() && other.is_partially_initialized()) {
 767     return -(other.compare(*this)); // flip the comparators
 768   }
 769   assert(!other.is_partially_initialized(), "Not initialized yet");
 770   if (is_partially_initialized()) {
 771     assert(other.major_version() >= 6,
 772            "Invalid JDK version comparison during initialization");
 773     return -1;
 774   } else {
 775     uint64_t e = encode_jdk_version(*this);
 776     uint64_t o = encode_jdk_version(other);
 777     return (e > o) ? 1 : ((e == o) ? 0 : -1);
 778   }
 779 }
 780 
 781 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 782   assert(buffer && buflen > 0, "call with useful buffer");
 783   size_t index = 0;
 784   if (!is_valid()) {
 785     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 786   } else if (is_partially_initialized()) {
 787     jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
 788   } else {
 789     int rc = jio_snprintf(
 790         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 791     if (rc == -1) return;
 792     index += rc;
 793     if (_micro > 0) {
 794       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
 795       if (rc == -1) return;
 796       index += rc;
 797     }
 798     if (_update > 0) {
 799       rc = jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
 800       if (rc == -1) return;
 801       index += rc;
 802     }
 803     if (_special > 0) {
 804       rc = jio_snprintf(&buffer[index], buflen - index, "%c", _special);
 805       if (rc == -1) return;
 806       index += rc;
 807     }
 808     if (_build > 0) {
 809       rc = jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
 810       if (rc == -1) return;
 811       index += rc;
 812     }
 813   }
 814 }