1 /*
   2  * Copyright (c) 1997, 2013, 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 "memory/genCollectedHeap.hpp"
  34 #include "memory/oopFactory.hpp"
  35 #include "memory/universe.hpp"
  36 #include "oops/constantPool.hpp"
  37 #include "oops/generateOopMap.hpp"
  38 #include "oops/instanceKlass.hpp"
  39 #include "oops/instanceOop.hpp"
  40 #include "oops/method.hpp"
  41 #include "oops/objArrayOop.hpp"
  42 #include "oops/oop.inline.hpp"
  43 #include "oops/symbol.hpp"
  44 #include "prims/jvmtiExport.hpp"
  45 #include "runtime/arguments.hpp"
  46 #include "runtime/biasedLocking.hpp"
  47 #include "runtime/compilationPolicy.hpp"
  48 #include "runtime/fprofiler.hpp"
  49 #include "runtime/init.hpp"
  50 #include "runtime/interfaceSupport.hpp"
  51 #include "runtime/java.hpp"
  52 #include "runtime/memprofiler.hpp"
  53 #include "runtime/sharedRuntime.hpp"
  54 #include "runtime/statSampler.hpp"
  55 #include "runtime/task.hpp"
  56 #include "runtime/thread.inline.hpp"
  57 #include "runtime/timer.hpp"
  58 #include "runtime/vm_operations.hpp"
  59 #include "services/memReporter.hpp"
  60 #include "services/memTracker.hpp"
  61 #include "trace/tracing.hpp"
  62 #include "utilities/dtrace.hpp"
  63 #include "utilities/globalDefinitions.hpp"
  64 #include "utilities/histogram.hpp"
  65 #include "utilities/macros.hpp"
  66 #include "utilities/vmError.hpp"
  67 #ifdef TARGET_ARCH_x86
  68 # include "vm_version_x86.hpp"
  69 #endif
  70 #ifdef TARGET_ARCH_sparc
  71 # include "vm_version_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_ARCH_zero
  74 # include "vm_version_zero.hpp"
  75 #endif
  76 #ifdef TARGET_ARCH_arm
  77 # include "vm_version_arm.hpp"
  78 #endif
  79 #ifdef TARGET_ARCH_ppc
  80 # include "vm_version_ppc.hpp"
  81 #endif
  82 #if INCLUDE_ALL_GCS
  83 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
  84 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
  85 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
  86 #endif // INCLUDE_ALL_GCS
  87 #ifdef COMPILER1
  88 #include "c1/c1_Compiler.hpp"
  89 #include "c1/c1_Runtime1.hpp"
  90 #endif
  91 #ifdef COMPILER2
  92 #include "code/compiledIC.hpp"
  93 #include "compiler/methodLiveness.hpp"
  94 #include "opto/compile.hpp"
  95 #include "opto/indexSet.hpp"
  96 #include "opto/runtime.hpp"
  97 #endif
  98 
  99 #ifndef USDT2
 100 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
 101 #endif /* !USDT2 */
 102 
 103 #ifndef PRODUCT
 104 
 105 // Statistics printing (method invocation histogram)
 106 
 107 GrowableArray<Method*>* collected_invoked_methods;
 108 
 109 void collect_invoked_methods(Method* m) {
 110   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 111     collected_invoked_methods->push(m);
 112   }
 113 }
 114 
 115 
 116 GrowableArray<Method*>* collected_profiled_methods;
 117 
 118 void collect_profiled_methods(Method* m) {
 119   Thread* thread = Thread::current();
 120   // This HandleMark prevents a huge amount of handles from being added
 121   // to the metadata_handles() array on the thread.
 122   HandleMark hm(thread);
 123   methodHandle mh(thread, m);
 124   if ((m->method_data() != NULL) &&
 125       (PrintMethodData || CompilerOracle::should_print(mh))) {
 126     collected_profiled_methods->push(m);
 127   }
 128 }
 129 
 130 
 131 int compare_methods(Method** a, Method** b) {
 132   // %%% there can be 32-bit overflow here
 133   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
 134        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
 135 }
 136 
 137 
 138 void print_method_invocation_histogram() {
 139   ResourceMark rm;
 140   HandleMark hm;
 141   collected_invoked_methods = new GrowableArray<Method*>(1024);
 142   SystemDictionary::methods_do(collect_invoked_methods);
 143   collected_invoked_methods->sort(&compare_methods);
 144   //
 145   tty->cr();
 146   tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
 147   tty->cr();
 148   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 149   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 150       synch_total = 0, nativ_total = 0, acces_total = 0;
 151   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 152     Method* m = collected_invoked_methods->at(index);
 153     int c = m->invocation_count() + m->compiled_invocation_count();
 154     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 155     int_total  += m->invocation_count();
 156     comp_total += m->compiled_invocation_count();
 157     if (m->is_final())        final_total  += c;
 158     if (m->is_static())       static_total += c;
 159     if (m->is_synchronized()) synch_total  += c;
 160     if (m->is_native())       nativ_total  += c;
 161     if (m->is_accessor())     acces_total  += c;
 162   }
 163   tty->cr();
 164   total = int_total + comp_total;
 165   tty->print_cr("Invocations summary:");
 166   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 167   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 168   tty->print_cr("\t%9d (100%%)  total",         total);
 169   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 170   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 171   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 172   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 173   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 174   tty->cr();
 175   SharedRuntime::print_call_statistics(comp_total);
 176 }
 177 
 178 void print_method_profiling_data() {
 179   ResourceMark rm;
 180   HandleMark hm;
 181   collected_profiled_methods = new GrowableArray<Method*>(1024);
 182   SystemDictionary::methods_do(collect_profiled_methods);
 183   collected_profiled_methods->sort(&compare_methods);
 184 
 185   int count = collected_profiled_methods->length();
 186   int total_size = 0;
 187   if (count > 0) {
 188     for (int index = 0; index < count; index++) {
 189       Method* m = collected_profiled_methods->at(index);
 190       ttyLocker ttyl;
 191       tty->print_cr("------------------------------------------------------------------------");
 192       //m->print_name(tty);
 193       m->print_invocation_count();
 194       tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
 195       tty->cr();
 196       // Dump data on parameters if any
 197       if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
 198         tty->fill_to(2);
 199         m->method_data()->parameters_type_data()->print_data_on(tty);
 200       }
 201       m->print_codes();
 202       total_size += m->method_data()->size_in_bytes();
 203     }
 204     tty->print_cr("------------------------------------------------------------------------");
 205     tty->print_cr("Total MDO size: %d bytes", total_size);
 206   }
 207 }
 208 
 209 void print_bytecode_count() {
 210   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 211     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 212   }
 213 }
 214 
 215 AllocStats alloc_stats;
 216 
 217 
 218 
 219 // General statistics printing (profiling ...)
 220 
 221 void print_statistics() {
 222 
 223 #ifdef ASSERT
 224 
 225   if (CountRuntimeCalls) {
 226     extern Histogram *RuntimeHistogram;
 227     RuntimeHistogram->print();
 228   }
 229 
 230   if (CountJNICalls) {
 231     extern Histogram *JNIHistogram;
 232     JNIHistogram->print();
 233   }
 234 
 235   if (CountJVMCalls) {
 236     extern Histogram *JVMHistogram;
 237     JVMHistogram->print();
 238   }
 239 
 240 #endif
 241 
 242   if (MemProfiling) {
 243     MemProfiler::disengage();
 244   }
 245 
 246   if (CITime) {
 247     CompileBroker::print_times();
 248   }
 249 
 250 #ifdef COMPILER1
 251   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
 252     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
 253     Runtime1::print_statistics();
 254     Deoptimization::print_statistics();
 255     SharedRuntime::print_statistics();
 256     nmethod::print_statistics();
 257   }
 258 #endif /* COMPILER1 */
 259 
 260 #ifdef COMPILER2
 261   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
 262     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
 263     Compile::print_statistics();
 264 #ifndef COMPILER1
 265     Deoptimization::print_statistics();
 266     nmethod::print_statistics();
 267     SharedRuntime::print_statistics();
 268 #endif //COMPILER1
 269     os::print_statistics();
 270   }
 271 
 272   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) {
 273     OptoRuntime::print_named_counters();
 274   }
 275 
 276   if (TimeLivenessAnalysis) {
 277     MethodLiveness::print_times();
 278   }
 279 #ifdef ASSERT
 280   if (CollectIndexSetStatistics) {
 281     IndexSet::print_statistics();
 282   }
 283 #endif // ASSERT
 284 #endif // COMPILER2
 285   if (CountCompiledCalls) {
 286     print_method_invocation_histogram();
 287   }
 288   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
 289     print_method_profiling_data();
 290   }
 291   if (TimeCompiler) {
 292     COMPILER2_PRESENT(Compile::print_timers();)
 293   }
 294   if (TimeCompilationPolicy) {
 295     CompilationPolicy::policy()->print_time();
 296   }
 297   if (TimeOopMap) {
 298     GenerateOopMap::print_time();
 299   }
 300   if (ProfilerCheckIntervals) {
 301     PeriodicTask::print_intervals();
 302   }
 303   if (PrintSymbolTableSizeHistogram) {
 304     SymbolTable::print_histogram();
 305   }
 306   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 307     BytecodeCounter::print();
 308   }
 309   if (PrintBytecodePairHistogram) {
 310     BytecodePairHistogram::print();
 311   }
 312 
 313   if (PrintCodeCache) {
 314     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 315     CodeCache::print();
 316   }
 317 
 318   if (PrintCodeCache2) {
 319     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 320     CodeCache::print_internals();
 321   }
 322 
 323   if (PrintClassStatistics) {
 324     SystemDictionary::print_class_statistics();
 325   }
 326   if (PrintMethodStatistics) {
 327     SystemDictionary::print_method_statistics();
 328   }
 329 
 330   if (PrintVtableStats) {
 331     klassVtable::print_statistics();
 332     klassItable::print_statistics();
 333   }
 334   if (VerifyOops) {
 335     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 336   }
 337 
 338   print_bytecode_count();
 339   if (PrintMallocStatistics) {
 340     tty->print("allocation stats: ");
 341     alloc_stats.print();
 342     tty->cr();
 343   }
 344 
 345   if (PrintSystemDictionaryAtExit) {
 346     SystemDictionary::print();
 347   }
 348 
 349   if (PrintBiasedLockingStatistics) {
 350     BiasedLocking::print_counters();
 351   }
 352 
 353 #ifdef ENABLE_ZAP_DEAD_LOCALS
 354 #ifdef COMPILER2
 355   if (ZapDeadCompiledLocals) {
 356     tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
 357     tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
 358   }
 359 #endif // COMPILER2
 360 #endif // ENABLE_ZAP_DEAD_LOCALS
 361   // Native memory tracking data
 362   if (PrintNMTStatistics) {
 363     if (MemTracker::is_on()) {
 364       BaselineTTYOutputer outputer(tty);
 365       MemTracker::print_memory_usage(outputer, K, false);
 366     } else {
 367       tty->print_cr(MemTracker::reason());
 368     }
 369   }
 370 }
 371 
 372 #else // PRODUCT MODE STATISTICS
 373 
 374 void print_statistics() {
 375 
 376   if (CITime) {
 377     CompileBroker::print_times();
 378   }
 379 
 380   if (PrintCodeCache) {
 381     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 382     CodeCache::print();
 383   }
 384 
 385 #ifdef COMPILER2
 386   if (PrintPreciseBiasedLockingStatistics) {
 387     OptoRuntime::print_named_counters();
 388   }
 389 #endif
 390   if (PrintBiasedLockingStatistics) {
 391     BiasedLocking::print_counters();
 392   }
 393 
 394   // Native memory tracking data
 395   if (PrintNMTStatistics) {
 396     if (MemTracker::is_on()) {
 397       BaselineTTYOutputer outputer(tty);
 398       MemTracker::print_memory_usage(outputer, K, false);
 399     } else {
 400       tty->print_cr(MemTracker::reason());
 401     }
 402   }
 403 }
 404 
 405 #endif
 406 
 407 
 408 // Helper class for registering on_exit calls through JVM_OnExit
 409 
 410 extern "C" {
 411     typedef void (*__exit_proc)(void);
 412 }
 413 
 414 class ExitProc : public CHeapObj<mtInternal> {
 415  private:
 416   __exit_proc _proc;
 417   // void (*_proc)(void);
 418   ExitProc* _next;
 419  public:
 420   // ExitProc(void (*proc)(void)) {
 421   ExitProc(__exit_proc proc) {
 422     _proc = proc;
 423     _next = NULL;
 424   }
 425   void evaluate()               { _proc(); }
 426   ExitProc* next() const        { return _next; }
 427   void set_next(ExitProc* next) { _next = next; }
 428 };
 429 
 430 
 431 // Linked list of registered on_exit procedures
 432 
 433 static ExitProc* exit_procs = NULL;
 434 
 435 
 436 extern "C" {
 437   void register_on_exit_function(void (*func)(void)) {
 438     ExitProc *entry = new ExitProc(func);
 439     // Classic vm does not throw an exception in case the allocation failed,
 440     if (entry != NULL) {
 441       entry->set_next(exit_procs);
 442       exit_procs = entry;
 443     }
 444   }
 445 }
 446 
 447 // Note: before_exit() can be executed only once, if more than one threads
 448 //       are trying to shutdown the VM at the same time, only one thread
 449 //       can run before_exit() and all other threads must wait.
 450 void before_exit(JavaThread * thread) {
 451   #define BEFORE_EXIT_NOT_RUN 0
 452   #define BEFORE_EXIT_RUNNING 1
 453   #define BEFORE_EXIT_DONE    2
 454   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 455 
 456   // Note: don't use a Mutex to guard the entire before_exit(), as
 457   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 458   // A CAS or OSMutex would work just fine but then we need to manipulate
 459   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 460   // for synchronization.
 461   { MutexLocker ml(BeforeExit_lock);
 462     switch (_before_exit_status) {
 463     case BEFORE_EXIT_NOT_RUN:
 464       _before_exit_status = BEFORE_EXIT_RUNNING;
 465       break;
 466     case BEFORE_EXIT_RUNNING:
 467       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 468         BeforeExit_lock->wait();
 469       }
 470       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 471       return;
 472     case BEFORE_EXIT_DONE:
 473       return;
 474     }
 475   }
 476 
 477   // The only difference between this and Win32's _onexit procs is that
 478   // this version is invoked before any threads get killed.
 479   ExitProc* current = exit_procs;
 480   while (current != NULL) {
 481     ExitProc* next = current->next();
 482     current->evaluate();
 483     delete current;
 484     current = next;
 485   }
 486 
 487   // Hang forever on exit if we're reporting an error.
 488   if (ShowMessageBoxOnError && is_error_reported()) {
 489     os::infinite_sleep();
 490   }
 491 
 492   // Terminate watcher thread - must before disenrolling any periodic task
 493   if (PeriodicTask::num_tasks() > 0)
 494     WatcherThread::stop();
 495 
 496   // Print statistics gathered (profiling ...)
 497   if (Arguments::has_profile()) {
 498     FlatProfiler::disengage();
 499     FlatProfiler::print(10);
 500   }
 501 
 502   // shut down the StatSampler task
 503   StatSampler::disengage();
 504   StatSampler::destroy();
 505 
 506   // We do not need to explicitly stop concurrent GC threads because the
 507   // JVM will be taken down at a safepoint when such threads are inactive --
 508   // except for some concurrent G1 threads, see (comment in)
 509   // Threads::destroy_vm().
 510 
 511   // Print GC/heap related information.
 512   if (PrintGCDetails) {
 513     Universe::print();
 514     AdaptiveSizePolicyOutput(0);
 515     if (Verbose) {
 516       ClassLoaderDataGraph::dump_on(gclog_or_tty);
 517     }
 518   }
 519 
 520   if (PrintBytecodeHistogram) {
 521     BytecodeHistogram::print();
 522   }
 523 
 524   if (JvmtiExport::should_post_thread_life()) {
 525     JvmtiExport::post_thread_end(thread);
 526   }
 527 
 528 
 529   EventThreadEnd event;
 530   if (event.should_commit()) {
 531       event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
 532       event.commit();
 533   }
 534 
 535   // Always call even when there are not JVMTI environments yet, since environments
 536   // may be attached late and JVMTI must track phases of VM execution
 537   JvmtiExport::post_vm_death();
 538   Threads::shutdown_vm_agents();
 539 
 540   // Terminate the signal thread
 541   // Note: we don't wait until it actually dies.
 542   os::terminate_signal_thread();
 543 
 544   print_statistics();
 545   Universe::heap()->print_tracing_info();
 546 
 547   { MutexLocker ml(BeforeExit_lock);
 548     _before_exit_status = BEFORE_EXIT_DONE;
 549     BeforeExit_lock->notify_all();
 550   }
 551 
 552   // Shutdown NMT before exit. Otherwise,
 553   // it will run into trouble when system destroys static variables.
 554   MemTracker::shutdown(MemTracker::NMT_normal);
 555 
 556   if (VerifyStringTableAtExit) {
 557     int fail_cnt = 0;
 558     {
 559       MutexLocker ml(StringTable_lock);
 560       fail_cnt = StringTable::verify_and_compare_entries();
 561     }
 562 
 563     if (fail_cnt != 0) {
 564       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
 565       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 566     }
 567   }
 568 
 569   #undef BEFORE_EXIT_NOT_RUN
 570   #undef BEFORE_EXIT_RUNNING
 571   #undef BEFORE_EXIT_DONE
 572 }
 573 
 574 void vm_exit(int code) {
 575   Thread* thread = ThreadLocalStorage::is_initialized() ?
 576     ThreadLocalStorage::get_thread_slow() : NULL;
 577   if (thread == NULL) {
 578     // we have serious problems -- just exit
 579     vm_direct_exit(code);
 580   }
 581 
 582   if (VMThread::vm_thread() != NULL) {
 583     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 584     VM_Exit op(code);
 585     if (thread->is_Java_thread())
 586       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 587     VMThread::execute(&op);
 588     // should never reach here; but in case something wrong with VM Thread.
 589     vm_direct_exit(code);
 590   } else {
 591     // VM thread is gone, just exit
 592     vm_direct_exit(code);
 593   }
 594   ShouldNotReachHere();
 595 }
 596 
 597 void notify_vm_shutdown() {
 598   // For now, just a dtrace probe.
 599 #ifndef USDT2
 600   HS_DTRACE_PROBE(hotspot, vm__shutdown);
 601   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 602 #else /* USDT2 */
 603   HOTSPOT_VM_SHUTDOWN();
 604 #endif /* USDT2 */
 605 }
 606 
 607 void vm_direct_exit(int code) {
 608   notify_vm_shutdown();
 609   os::wait_for_keypress_at_exit();
 610   ::exit(code);
 611 }
 612 
 613 void vm_perform_shutdown_actions() {
 614   // Warning: do not call 'exit_globals()' here. All threads are still running.
 615   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 616   // kinds of assertions to trigger in debug mode.
 617   if (is_init_completed()) {
 618     Thread* thread = ThreadLocalStorage::is_initialized() ?
 619                      ThreadLocalStorage::get_thread_slow() : NULL;
 620     if (thread != NULL && thread->is_Java_thread()) {
 621       // We are leaving the VM, set state to native (in case any OS exit
 622       // handlers call back to the VM)
 623       JavaThread* jt = (JavaThread*)thread;
 624       // Must always be walkable or have no last_Java_frame when in
 625       // thread_in_native
 626       jt->frame_anchor()->make_walkable(jt);
 627       jt->set_thread_state(_thread_in_native);
 628     }
 629   }
 630   notify_vm_shutdown();
 631 }
 632 
 633 void vm_shutdown()
 634 {
 635   vm_perform_shutdown_actions();
 636   os::wait_for_keypress_at_exit();
 637   os::shutdown();
 638 }
 639 
 640 void vm_abort(bool dump_core) {
 641   vm_perform_shutdown_actions();
 642   os::wait_for_keypress_at_exit();
 643   os::abort(dump_core);
 644   ShouldNotReachHere();
 645 }
 646 
 647 void vm_notify_during_shutdown(const char* error, const char* message) {
 648   if (error != NULL) {
 649     tty->print_cr("Error occurred during initialization of VM");
 650     tty->print("%s", error);
 651     if (message != NULL) {
 652       tty->print_cr(": %s", message);
 653     }
 654     else {
 655       tty->cr();
 656     }
 657   }
 658   if (ShowMessageBoxOnError && WizardMode) {
 659     fatal("Error occurred during initialization of VM");
 660   }
 661 }
 662 
 663 void vm_exit_during_initialization(Handle exception) {
 664   tty->print_cr("Error occurred during initialization of VM");
 665   // If there are exceptions on this thread it must be cleared
 666   // first and here. Any future calls to EXCEPTION_MARK requires
 667   // that no pending exceptions exist.
 668   Thread *THREAD = Thread::current();
 669   if (HAS_PENDING_EXCEPTION) {
 670     CLEAR_PENDING_EXCEPTION;
 671   }
 672   java_lang_Throwable::print(exception, tty);
 673   tty->cr();
 674   java_lang_Throwable::print_stack_trace(exception(), tty);
 675   tty->cr();
 676   vm_notify_during_shutdown(NULL, NULL);
 677 
 678   // Failure during initialization, we don't want to dump core
 679   vm_abort(false);
 680 }
 681 
 682 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 683   ResourceMark rm;
 684   vm_notify_during_shutdown(ex->as_C_string(), message);
 685 
 686   // Failure during initialization, we don't want to dump core
 687   vm_abort(false);
 688 }
 689 
 690 void vm_exit_during_initialization(const char* error, const char* message) {
 691   vm_notify_during_shutdown(error, message);
 692 
 693   // Failure during initialization, we don't want to dump core
 694   vm_abort(false);
 695 }
 696 
 697 void vm_shutdown_during_initialization(const char* error, const char* message) {
 698   vm_notify_during_shutdown(error, message);
 699   vm_shutdown();
 700 }
 701 
 702 JDK_Version JDK_Version::_current;
 703 const char* JDK_Version::_runtime_name;
 704 const char* JDK_Version::_runtime_version;
 705 
 706 void JDK_Version::initialize() {
 707   jdk_version_info info;
 708   assert(!_current.is_valid(), "Don't initialize twice");
 709 
 710   void *lib_handle = os::native_java_library();
 711   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 712      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 713 
 714   if (func == NULL) {
 715     // JDK older than 1.6
 716     _current._partially_initialized = true;
 717   } else {
 718     (*func)(&info, sizeof(info));
 719 
 720     int major = JDK_VERSION_MAJOR(info.jdk_version);
 721     int minor = JDK_VERSION_MINOR(info.jdk_version);
 722     int micro = JDK_VERSION_MICRO(info.jdk_version);
 723     int build = JDK_VERSION_BUILD(info.jdk_version);
 724     if (major == 1 && minor > 4) {
 725       // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
 726       major = minor;
 727       minor = micro;
 728       micro = 0;
 729     }
 730     _current = JDK_Version(major, minor, micro, info.update_version,
 731                            info.special_update_version, build,
 732                            info.thread_park_blocker == 1,
 733                            info.post_vm_init_hook_enabled == 1,
 734                            info.pending_list_uses_discovered_field == 1);
 735   }
 736 }
 737 
 738 void JDK_Version::fully_initialize(
 739     uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
 740   // This is only called when current is less than 1.6 and we've gotten
 741   // far enough in the initialization to determine the exact version.
 742   assert(major < 6, "not needed for JDK version >= 6");
 743   assert(is_partially_initialized(), "must not initialize");
 744   if (major < 5) {
 745     // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
 746     micro = minor;
 747     minor = major;
 748     major = 1;
 749   }
 750   _current = JDK_Version(major, minor, micro, update);
 751 }
 752 
 753 void JDK_Version_init() {
 754   JDK_Version::initialize();
 755 }
 756 
 757 static int64_t encode_jdk_version(const JDK_Version& v) {
 758   return
 759     ((int64_t)v.major_version()          << (BitsPerByte * 5)) |
 760     ((int64_t)v.minor_version()          << (BitsPerByte * 4)) |
 761     ((int64_t)v.micro_version()          << (BitsPerByte * 3)) |
 762     ((int64_t)v.update_version()         << (BitsPerByte * 2)) |
 763     ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
 764     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 765 }
 766 
 767 int JDK_Version::compare(const JDK_Version& other) const {
 768   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 769   if (!is_partially_initialized() && other.is_partially_initialized()) {
 770     return -(other.compare(*this)); // flip the comparators
 771   }
 772   assert(!other.is_partially_initialized(), "Not initialized yet");
 773   if (is_partially_initialized()) {
 774     assert(other.major_version() >= 6,
 775            "Invalid JDK version comparison during initialization");
 776     return -1;
 777   } else {
 778     uint64_t e = encode_jdk_version(*this);
 779     uint64_t o = encode_jdk_version(other);
 780     return (e > o) ? 1 : ((e == o) ? 0 : -1);
 781   }
 782 }
 783 
 784 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 785   size_t index = 0;
 786   if (!is_valid()) {
 787     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 788   } else if (is_partially_initialized()) {
 789     jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
 790   } else {
 791     index += jio_snprintf(
 792         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 793     if (_micro > 0) {
 794       index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
 795     }
 796     if (_update > 0) {
 797       index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
 798     }
 799     if (_special > 0) {
 800       index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
 801     }
 802     if (_build > 0) {
 803       index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
 804     }
 805   }
 806 }